Role of casein hydrolysate manufacturing conditions on hydrolysate technofunctional properties Essay Example

Role of casein hydrolysate manufacturing conditions on hydrolysate technofunctional properties Essay Example Role of casein hydrolysate manufacturing conditions on hydrolysate technofunctional properties Essay Role of casein hydrolysate manufacturing conditions on hydrolysate technofunctional properties Essay Introduction 1.1 Casein Milk contains about 30-35g protein /L. Approximately 80 % of which are present in casein micelles, these are big spherical composites incorporating 92 % protein and 8 % low molecular mass constituents, chiefly inorganic salts, chiefly calcium phosphate. Caseins represent four cistron merchandises IÂ ±s1-casein, IÂ ±s2-casein, I?-casein and I?-casein. Figure 1.1.1 shows the different protein types and their concentrations in milk. ( Advanced nutrient Chemistry A ) ( Advanced Food Chemistry A ) The precise construction of the casein is micelle has been subjected to legion scientific studied. Several theoretical accounts have been proposed over the last figure of old ages in order to depict casein micelle behavior. Caseins have distinguishable countries of positively and negatively charged groups in their primary constructions ensuing in amphiphilic belongingss. The caseins are known as rheomorphic proteins as they have highly flexible molecular construction. The caseins are thought to hold IÂ ±-helical or I?- sheet constructions, once more this is merely from theoretical surveies no such constructions have been found in the caseins because they have yet to be successfully crystallised. The secondary construction is loose and lacks order due to the high figure of proline residues which cause the protein concatenation to flex in a peculiar manner. Casein micelles are really stable against heat denaturation. As there is no third there is considerable exposure of hydrophobic residues, these consequence in strong association reactions and makes them comparatively indissoluble in H2O. All the caseins are conjugated proteins, most with one or more phosphate groups which are esterified to serine residues. These phosphate groups are of import to the construction of the casein micelle as Ca binding of the caseins is relative to the phosphate content. Table 1.1.2 shows some of the physicochemical features of the casein micelles. ( University G ) Physicochemical Features of Casein Micelle Diameter 50-300nm Surface Area 8 ten 10-10 cm2 Volume 2 ten 10-15 cm3 Density 1.063 g cm-3 Molecular weight ( hydrated ) 1.3 ten 109 Da Fullness 4.4cm3 per g protein Hydration 2g H2O per g protein Water Content ( hydrated ) 63 % ( Handbook ) ( Table 1.1.2 ) 1.2 Sodium Caseinate Manufacture ( Fig 1.2.1 ) ( Handbook ) Figure 1.2.1 gives a basic representation of the fabricating procedure of Na caseinate. The procedure involves foremost the separation of milk and pick, followed by pasteurisation. The caseins are so precipitated either by the add-on of a coagulator such as rennet or by a decrease in pH to 4.6 ( its isoelectric point ) . The curdled protein is heated to organize a curd. The curd is so separated from the whey by filtration or centrifugation in combination with counter-current rinsing with H2O. The curd is so reacted with an base, eg Na hydrated oxide and so dried to organize a caseinate. ( Handbook ) 1.3 Bioactive Peptides The primary construction of proteins consists of certain aminic acid sequences that have the ability to exercise physiological benefits in human existences. The amino acid sequences remain inactive when they are present as portion of the uninterrupted primary construction of the parent protein. However, when the parent protein is acted upon by an appropriate enzyme, the peptide is released ( Dr Rotimi Aluko ) . Enzymatic hydrolysis of milk proteins has been shown to cut down antigenicity, and increase biological activity for illustration by the release of immunomodulating, opioid and antihypertensive peptides. To this terminal, turning involvement has been focused on physiologically active peptides derived from milk proteins. In add-on, the little peptides present in protein hydrolysates are absorbed more quickly from the bowel than free amino acids or integral proteins. ( Spellman et Al ) . A sum-up of bioactive peptides which are derived from milk proteins and their maps are displa yed in figure 1.3.1 ( Hannu K ) ( Fig 1.3.1 ) 1.4 Enzyme readying The enzyme readying used for casein hydrolysis in this survey was Prolyve 1000a„? a commercially available protease readying which is of bacterial beginning. This readying contains the enzyme Subtilisin Carlsberg which is from a household of serine endopeptidases isolated from Bacillus licheniformis. Endopeptidases are enzymes which cleave within the protein or polypeptide concatenation. Subtilisin Carlsberg has a wide specificity for the hydrolysis of peptide bonds, with a penchant for a big uncharged residue. It is an aromatic enzyme with a penchant for carboxyl side cleavage. Hydrolyzes peptide amides incorporating leucine and tyrosine residues. This enzyme readying has been used in the hydrolysis of whey proteins ( Spellman et Al, 200 ) nevertheless to day of the month at that place does non look to be any publications utilizing this enzyme activity in the hydrolysis of casein substrates. 1.5 Resentment The chief disadvantage of protein hydrolysis is bitterness. Integral nutrient proteins due to their molecular size are improbable to interact with the taste-bud receptors and as such would non lend significantly to season ( Enzymology ) . As hydrolysis interruptions down these proteins into much smaller peptides interaction with taste-bud receptors can happen. Besides in Intact casein micelles the most hydrophobic amino acids are oriented towards the inside of the molecule, during hydrolysis peptides incorporating hydrophobic amino acids are released. As hydrolysis continues, more hydrophobic amino acid residues become exposed for this ground hydrolysate resentment by and large increases with increasing hydrolysis ( Spellman et Al ) . The Q-rule devised by ( Ney, 1971 ) established a quantitative relationship between the amino acerb composing of a peptide and its resentment. Using the values calculated by ( Tanford,1962 ) , the Q-rule stated that peptides with an mean hydrophobicity ( Q ) value greater than 1400calmola?’1 and with molecular multitudes below 6000Da elicit a acrimonious taste. ( Lemieux,1992 ) . Figure 1.5.1 shows several protein types and their Q values, it besides shows the different casein categorizations and their single Q values. I?-casein has a Q value of greater than 1400 kcal mol-1 this may slightly predispose to bitterness if during the hydrolysis the proteins are broken down to peptides weighing less than 6000Da ( Figure 1.5.1 ) Bitter peptides typically contain 3-15 amino acids and are characterised by the presence of hydrophobic aminic acids such as leucine, isoleucine, proline, valine, phenylalanine, tyrosine and tryptophan. ( Enzymology ) . The distinguishable acrimonious spirit of protein hydrolysates has been a major restriction in their usage in nutrient and wellness merchandises, they would necessitate to be incorporated into nutrients at really low concentrations to forestall its presence bring forthing an unacceptable spirit. 1.6 Enzymatic Hydrolysis of protein and the factors which affect it Enzymatic hydrolysis of protein is the procedure by which proteins are broken down by peptidases. Several factors affect the rate hydrolysis these include, enzyme specificity, extent of protein denaturation, enzyme: substrate ratio, entire solids concentrations, viscousness, pH, ionic strength, temperature and absence or presence of repressive substances. The specificity of an enzyme is a cardinal factor, act uponing both the figure and location of the peptide linkages that are hydrolyzed. Endopeptidases cleave the peptide linkage between two next amino acid residues in the primary sequence of a protein, giving two peptides. Proteolysis can continue either consecutive, by let go ofing one peptide at a clip, or through the formation of intermediates that are farther hydrolyzed to smaller peptides. ( Panyam et al, 1996 ) . There is really small information available about the consequence of entire solids on the rate of hydrolysis or the resulting belongingss of the hydrolysate samples. Spellman et Al, 2004 carried out a survey on whey protein hydrolysates and how entire solids affected the rate of the hydrolysis and the physiochemical belongingss of the end point hydrolysates. They concluded that the resentment of the hydrolysate samples decreased with increasing entire solids concentrations. Viscosity is the step of opposition to flux. Solvent viscousness can act upon rates of enzyme catalyzed reactions by two principle mechanisms: ( 1 ) Since molecular diffusion coefficients vary reciprocally with the viscousness of the medium, an addition in solvent viscousness will take to a lessening in the association rate of an enzyme and substrate. This will attest itself in a viscosity-dependent lessening in kc/Km for reactions in which the procedure that is governed by kc/Km is diffusion-controlled. ( 2 ) Since dissolver viscousness dampens structural fluctuations of proteins through frictional effects, additions in solvent viscousness will take to lessenings in reaction rates for catalytic procedures that are dependent on enzyme structural fluctuations Dang, 1998 this is supported by surveies from Gavish, 1979 and Ng, 1991 The consequence of temperature on the rate of enzymatic hydrolysis relates to the enzyme and the optimal conditions to ease its reaction but besides to the substrate where cautiousness must be taken in order to avoid /facilitate heat denaturation. Whichever of the conditions is preferred should be controlled. pH besides affects the rate of enzyme action and may present a menace of denaturation the enzyme. pH besides has an consequence on protein solubility. The iso-electric point is the pH at which the protein has no net charge, at this pH proteins would lose solubility and precipitate out of solution. Enzymes work better on proteins in solution. The ionic strength of the may impact the rate of hydrolysis. A solution of low ionic strength ( 0.5M 1.0M ions of impersonal salts ) may increase the solubility of the protein by salting in . Whereas concentrations above 1.0M may cut down the solubility of the protein as it causes increased competition for H2O molecules, favoring protein- protein interactions and thereby salting out . 1.7 TNBS Assay The method used to quantify the grade of hydrolysis ( DH ) of the Na caseinate hydrolysates was the trinitrobenzenesulfonic acid ( TNBS ) assay that was described by Adler-Nissen,1979 ) . Degree of hydrolysis ( DH ) is defined as the per centum of the entire figure of peptide bonds in the protein which have been cleaved by hydrolysis. The TNBS Assay was used in this undertaking as it has been proven to be a extremely accurate method for quantifying the DH of hydrolysate samples ( Spellman, 2003 ) . The one drawback of this method is that is requires long incubation and chilling stairss. This method is a spectrophotometric check of the chromophore formed by the reaction of the TNBS with primary Zanzibar copals. Figure 1.8.1 is a representation of the basic mechanism of how the TNBS check plants. Simply put the TNBS reagent binds to the NH2 group of the peptides in the sample and in making so creates a xanthous coloring material. The more hydrolyzed the sample is the more peptides there are and hence the more NH2 groups to adhere to and the more xanthous the solution will go. These solutions are so read spectrophotometrically . This check consists of several stairss foremost the protein hydrolsate is dispersed in hot 1 % Na dodecyl sulphate ( SDS ) , this serves to guarantee an accurate consequence as it prevents clip-clop of the protein and enables the TNBS reagent to split all of the NH2 groups. This reaction favours somewhat alkalic conditions ( pH 8.2 ) which is facilitated by the add-on of Na phosphate buffer. TNBS reagent reacts easy with hydroxyl ions and could do the space to give a false somewhat increased reading. This addition is stimulated by visible radiation and for this ground many of the stairss are carried out in the dark, such as the incubation for 1hour at 50Â °C and the subsequent expiration of the reaction which is achieved by take downing the pH. Termination is accomplished by the add-on of HCL, cautiousness must be taken to guarantee that the pH does non drop at a lower place 3.5 as this would causes turbidness. The samples are allowed to chill at room temperature for 30mins, chillin g below room temperature may besides do turbidness. After standing for 30mins the samples and their optical density readings are stable and more accurate. 1.8 Reverse Phase -High Performance Liquid Chromatography ( RP-HPLC ) Reverse-phase ( RP ) HPLC is an indispensable tool in the separation of proteins and peptides. RP-HPLC is widely used in protein surveies because of its versatility, sensitive sensing ( can divide proteins of about indistinguishable construction ) and its ability to work together with techniques such as mass spectroscopy. High public presentation liquid chromatography severs to heighten detectability of the analyte and can be applied to the analysis of any compound with solubility in a liquid that can be used as the nomadic stage ( Rounds, 1988 ) . The major constituents of a high public presentation liquid chromatography system include a pump, injector, column, sensor and information system. Change by reversal stage -HPLC is where the mutual oppositions of the stationary stage and the nomadic stage are reversed in comparing to the normal stage of soaking up chromatography ( Macrae, 1988 ) . The stationary stage is a solid support that is non-polar. Reversed stage media are composed of a base matrix to which organic ligands for surfacing silicon oxide such as octyl ( C8 ) or octadecyl groups ( C18 ) are attached ( Sofer, 1997 ) . The nomadic stage is a polar liquid that flows over the stationary stage. The sample is dissolved in the initial nomadic stage ( eg. Trifluoroacetic acid ) prior to being filtered and applied by injection to the column. Polar nomadic stages are normally H2O assorted with methyl alcohol, acetronitrile or trifluoroacetic acid ( Rounds, 1988 ) . The interaction of the constituents bring separated and the stationary stage rely on hydrophobic interactions and this determines the grade of migration in the column and separation of the constituents in the sample. Polar compounds are the first to be eluted as they are hydrophilic and have hebdomad interactions with the stationary stage. The pumps map is to present the nomadic stage through the system at a controlled flow rate of 1ml/min. Gradient elution system is used which involves two independent programmable pumps that are mixed at high force per unit areas ( Rounds, 1988 ) . This allows different compounds to be eluted by increasing the strength of the organic dissolver in a additive manner. The usage of a valve injector places the sample for dividing into the following nomadic stage and it is carried in this liquid for debut into the column. The sample injection is normally automated. The HPLC column is normally constructed of chromium steel steel tubing with eradicators that allow it to be connected between the injector and sensor of the system ( Rounds, 1988 ) . The packing stuff for this column is in the signifier of a chromatographic bed and acts as both a stationary stage and a support. The sensor for the HPLC is the constituent that emits a response due to the eluting sample compound/ concentration alterations in the column eluent and later signals a extremum on the chromatogram. Peptides do non absorb light above 220nm and soaking up of 214nm may be used to follow the concentration of peptides in the column wastewater ( Sofer, 1997 ) . Optical density of peptide at this wavelength is performed as peptides do non hold a 3-dimensional construction and all the amino acids are exposed and easy interact with the chromatographic media. Proteins don non hold the same interaction with the media as merely a little measure of its molecules tend to interact. Proteins usually show an optical density at 280nm due to the content of aromatic amino acid replacements ( Sofer, 1997 ) . Ultra violet sensing allows following of protein concentration of the wastewater and a chromatogram visually shows the extremums of the peptides and aromatic amino acids nowadays in sample. Column and nomadic stage temperature and pH can impact the separation of proteins and peptides by RP-HPLC. Increasing the temperature reduces the keeping of peptides. The temperature affects the comparative keeping of selectivity, which affects declaration ( David Carr ) . 1.9 Centripetal Evaluation Centripetal rating involves both rules of experimental design and statistical analysis. Centripetal rating of nutrient can utilize the human senses of gustatory sensation, touch, sight and odor to measure different facets of nutrient such as spirit, texture, visual aspect and olfactory property. For this undertaking the accent is on spirit and gustatory sensation will be the sense of pick. Flavour can be referred to as the esthesis perceived from nutrient or liquid taken in the oral cavity ( Fisher et al, 1997 ) . The four basic gustatory sensations are sweet, rancid, salty and bitter. For this undertaking a centripetal panel was selected and trained. Campaigners for the panel were selected foremost on the footing of being able to separate between Sweet, rancid, salty and bitter. Successful campaigners were so trained to observe and quantify resentment utilizing caffeine criterions. Statistical analysis of the resentment tonss was carried out utilizing the statistical programme R ver sion 2.10.1AÂ © , One-way analysis of discrepancy ( ANOVA ) and independent-samples t-tests were performed on centripetal informations. A important consequence was defined as P lt ; 0.05, a extremely important consequence was defined as P lt ; 0.001. Centripetal rating is a important facet in every undertaking whose ultimate end is to market a food/ functional nutrient merchandise. Bitterness is a major restricting factor in the production and incorporation protein hydrolysate into nutrients and centripetal rating is the most effectual method of finding the resentment degree. 1.10 Aims of this survey The aims of this survey are: O To bring forth Na caseinate hydrolysates at different protein/ entire solids concentrations. O Physicochemical word picture of the hydrolysate samples. O Selection and preparation of a centripetal panel to find the degree of resentment of the hydrolysates. O To find if the resentment of Na caseinate hydrolysates is related to protein/ entire solids concentration at which the hydrolysates were generated. Chapter 2 Materials and Methods 2 Materials and Methods 2.1 Materials Sodium caseinate was obtained from Kerry Group, Ireland and its protein content was determined to be 88.01 % utilizing Kjeldhal analysis. Prolyve 1000 was obtained from Lyven Enzymes Industrielles, Caen, France Trifluoroacetic acid ( TFA ) , HPLC class acetonitrile, L-leucine, HPLC grade H2O, Citric acid, Na chloride, sucrose and caffeine were obtained from Sigma Chemical Co. ( Poole, Dorset, UK ) . PuradiscTM 25 AS disposable syringe filters ( 0.2 AÂ µm ) , Supor_ hydrophilic membrane filters ( 47 millimeter, 0.2 lumen ) and 2N NaOH ( Titripur, SWR, 1.09136,1000 ) were obtained from VWR chemicals, Ireland. 2.2 Protein finding utilizing the Kjeldahl process The Kjeldhal method for finding protein concentration is an accretion of several reactions, the first of which is digestion, where protein N is liberated to organize ammonium ions. Sulphuric acid oxides organic affair and it combines with the ammonium formed. The 2nd reaction consists of the sulfuric acid in the sample being neutralised with NaOH organizing ammonium hydroxide which is so distilled into a 4 % boracic acerb solution for the 3rd reaction. For the forth reaction a titration takes topographic point between the borate ions formed and the standardized 0.1M HCL until a pH of 4.6 is reached. Oz Moles of HCL= Moles of NH3 = Moles of N in sample. % Nitrogen x transition factor ( 6.38 ) = % protein Approximately 0.2g of Na caseinate pulverization was accurately weighed out and transferred into a Kjeldhal flask. Sucrose was used as a space. Into each flask 20mL of concentrated H2SO4 ( Low in N ) and two kjeldhal tablets. The samples were so placed in the Kjeldhal digestion unit ( Buchi, Labortechnik AO, Postfrach, Switzerland ) at 120Â °C for half an hr and temp increased to 420Â °C for 2 hours. During this clip digestion of organic affair in the sample occurs. After digestion the tubings are so cooled before being transferred to the Kjeldhal Buchi B323 Distillation unit for distillment and subsequent finding of protein content. This process was performed in triplicate. 2.3 Enzymatic hydrolysis of Na caseinate For the balance of this thesis the hydrolysate samples will be referred to in respects to protein concentration. Table 2.3.1 shows protein concentration in proportion to entire solids concentration for the Na caseinate hydrolysates generated at different protein/ entire solids concentrations. Table 2.3.1 Protein Concentration Entire Solids Concentration 5 % ( w/v ) 56.8g/L 10 % ( w/v ) 113.6g/L 15 % ( w/v ) 170.4g/L 20 % ( w/v ) 227.2g/L The enzymatic hydrolysis experiments were carried out in a 2L certain reaction vas ( ___ ) . The aqueous solutions of Na caseinate were allowed to hydrate for ~ 2hours at 50Â °C with the assistance of an overhead scaremonger. The solutions were so stored in a electric refrigerator at 4Â °C nightlong. On the twenty-four hours of the hydrolysis the solutions were equilibrated to 50Â °C and the pH was so adjusted to 7 by the add-on of 2N NaOH before the add-on of the enzyme. Prolyve 1000 was added at an enzyme: substrate ( Tocopherol: S ) ratio of 25ml enzyme readying / kilogram protein. The Tocopherol: S ratio was estimated on the footing of what has antecedently worked for whey, the standard add-on was 0.25mls of enzyme solution per 100ml to 10 % solution. The solution was assorted with an over caput scaremonger ( Heidolph Instruments, Schwabach, Germany ) and the pH was kept changeless throughout the hydrolysis utilizing a pH stat ( 718 Stat Titrino, Metrohm, Herisau, Switzerland ) . Hydrolysate samples were taken at assorted clip intervals, rapidly brought to 80Â °C utilizing a microwave and so maintained at 80Â °C for 20mins in a H2O bath to demobilize the enzyme. The samples were so stored at -20Â °C until required for analysis. 2.4 Quantification of Degree of Hydrolysis ( DH ) The TNBS reagent was made up of 0.1 % ( w/v ) TNBS in H2O. 1 % ( w/v ) SDS was used as the space and l-Leucine was used as the criterion. Samples and standard solutions were prepared in 1 % ( w/v ) SDS. The hydrolysate samples were diluted ( 1 in 51, 1 in 76, 1 in 101, 1 in 126, 1 in 151 A ; 1 in 201 in conformity with their protein concentrations ) . All samples were done in triplicate. 0.25 milliliter of the trial, integral Na caseinate ( control ) and l-Leucine criterion solutions was added to prove tubings incorporating 2.0mL of Na phosphate buffer ( 0.2125 m, pH 8.2 ) . The undermentioned stairss are light sensitive and took topographic point in the dark: 2 milliliter of TNBS reagent was so added to each tubing, followed by vortexing and incubation at 50AÂ °C for 60 min in a covered H2O bath. After incubation, the reaction was stopped by the add-on of 0.1N HCl ( 4.0 milliliter ) to each tubing. The samples were so allowed to chill in the dark at room temperature in order to st abilise the optical density readings. The optical density values were so read at 340nm utilizing a ( Carey 100 dual beam spectrophotometer ) The DH was calculated as follows: Where the N content of peptide bonds = 112.1 milligram of Nitrogen /g of protein for casein substrates. The protein concentration became marginally more dilute as NaOH was added throughout the hydrolysis reaction ; the protein concentration was calculated consequently. 2.5 RP-H.P.L.C. Reversed-phase HPLC was carried out on the Na caseinate hydrolysate samples utilizing a Waters HPLC system, consisting a Model 1525 binary pump, a Model 717 Plus autosampler and a Model 2487 double IÂ » optical density sensor interfaced with a BreezeTM data-handling bundle ( Waters, Milford, MA, USA ) . The column used was a Phenomenex Jupiter ( C18, 250r4.6 millimeter ID, 5 millimeter atom size, 300AAÂ ° pore size ) dividing column ( Phenomenex, Cheshire, UK ) with a Security GuardTM system incorporating a C18 ( ODS ) broad pore cartridge ( 4r3 millimeter ID, Phenomenex, Cheshire, UK ) . The column was equilibrated with dissolver A ( 0.1 % TFA ) at a flow rate of 1.0 ml min-1 and peptides were eluted with an increasing gradient of dissolver B ( 0. 1 % TFA, 80 % acetonitrile ) . TFA is used in HPLC as it improves symmetricalness of signals. Detector response was monitored at 214 nanometer A ; 280nm. The Na caseinate hydrolysate samples were diluted to 0.8 % ( w/v ) in 0.1 % TFA, filtered through 0.2 AÂ µm syringe filters and 20 AÂ µl was applied to the column. The undermentioned tabular arraies show the 3 different gradient profiles used in analyzing the samples. Basic contrary stage high public presentation liquid chromatography gradient profile Time Flow % A % B Curve 1 0.01 1.00 100.0 0.0 6 2 4.00 1.00 100.0 0.0 6 3 54.00 1.00 40.0 60.0 6 4 55.00 1.00 0.0 100.0 6 5 65.00 1.00 0.0 100.0 6 6 70.00 1.00 100.0 0.0 6 7 85.00 1.00 100.0 0.0 6 ( Table 2.5.1 ) Modified Profile 1 Time Flow % A % B Curve 1 0.01 1.00 100.0 0.0 6 2 4.00 1.00 100.0 0.0 6 3 84.00 1.00 40.0 60.0 6 4 85.00 1.00 0.0 100.0 6 5 95.00 1.00 0.0 100.0 6 6 100.00 1.00 100.0 0.0 6 7 115.00 1.00 100.0 0.0 6 ( Table 2.5.2 ) Modified Profile 2 Time Flow % A % B Curve 1 0.01 1.00 100.0 0.0 6 2 4.00 1.00 100.0 0.0 6 3 114.00 1.00 40.0 60.0 6 4 115.00 1.00 0.0 100.0 6 5 125.00 1.00 0.0 100.0 6 6 130.00 1.00 100.0 0.0 6 7 145.00 1.00 100.0 0.0 6 ( Table 2.5.3 ) The ultimate profile used on the samples with similar DH values but of different protein concentrations was the modified profile 2. 2.6 Centripetal In choosing campaigners for the gustatory sensation panel a acknowledgment trial for the four gustatory sensations was foremost performed. This involved doing up solutions of citric acid monohydrate ( rancid ) , sucrose ( sweet ) , caffeine ( acrimonious ) and NaCl ( salt ) all of which were made up in Ballygowan still H2O. At least two concentrations of each sample stand foring a gustatory sensation were included in the centripetal rating see table 2.6.1 Recognition Test Layout Sample Letter Concentration Chemical ( Taste ) A 0.02 % ( w/v ) Citric acid monohydrate ( Sour ) Bacillus 0.40 % ( w/v ) Sucrose ( Sweet ) C 0.03 % ( w/v ) Citric acid monohydrate ( Sour ) Calciferol 0.02 % ( w/v ) Caffeine ( Bitter ) Tocopherol 0.08 % ( w/v ) NaCl ( Salty ) F 0.60 % ( w/v ) Sucrose ( Sweet ) Gram 0.03 % ( w/v ) Caffeine ( Bitter ) Hydrogen Ballygowan still H2O Joule 0.15 % ( w/v ) NaCl ( Salty ) K 0.04 % ( w/v ) Citric acid monohydrate ( Sour ) ( Table 2.6.1 ) The campaigners were told that the samples contained natural Sweet, salty, rancid and acrimonious compounds. They were asked to savor each sample separately and bespeak whether the sample was sweet, salty, rancid or bitter in the provided infinites. If the sample tasted like H2O they were asked to tag with a nothing ( 0 ) , if they were unsure of the gustatory sensation they were asked to tag with a inquiry grade ( ? ) . When savoring the sample the campaigners were asked to twirl the solution around your oral cavity guaranting it contacts all parts of the lingua. Between samples, campaigners were asked to eat a piece of un-salted cracker and rinse their oral cavities exhaustively with still mineral H2O. A cut off point was set at 6 right replies, 1 of which must be acrimonious or 5 right replies, 2 of which must be acrimonious. Out of the 17 campaigners screened, 7 were selected for bitterness preparation. For the resentment preparation campaigners were asked to delegate bitterness tonss to unknown solutions based on a 0-100 % graduated table, where a 100 % acrimonious solution was taken to hold a resentment value equivalent to 1 g caffeine/L. Still mineral H2O was used as the 0 % bitterness criterion. All 7 displayed a strong ability to observe differen

Comments and questions from classmates on USTA case study questions Assignment

Comments and questions from classmates on USTA case study questions - Assignment Example I build a six step research question in trying to elucidate how USTA approached its management dilemma question to enable the organization come up with a long lasting management decision. Step 2 was to clarify how USTA aimed at expanding itself by persuading more people with divers civilization, masculinity/gender and wealth level to enable the organization acquire vivacious information towards the diversifying multicultural population (Johnson & Clark, 2006). USTA required essential data by involving diverse demographical information to enable the organization design a measurement question of what the household income for male and female who played tennis was in the last 12 months. Thank you for your concern. I used intuition to replace perception as the two words are tantamount, but I came to realize that â€Å"perception† work best than â€Å"intuition†. Thank you for clarification. Your research question hierarchy is impressive. The research USTA undertook was to enable it expand by reaching a more diversified populace hence changing the existed elitist typecast. Therefore, do you support this type of research to be adopted as a universal way of conducting business research? Evidently, nominal data cannot be tabulated in a mathematical way. I would like to pinpoint that USTA used a large sample size, which led to a greater depiction of the population and reduced standard error but at a greater cost. Moreover, the closed questionnaire structure was intentionally meant to reduce inconsistency in the results, and this enabled the company to obtain a less scattered data (Anderson & Whitcomb,  2001). Thanks for your participation. However, I am still not contented with your choice of the measurement scale. From the USTA case study, predominant parameters included social stratification, demographic assessment and people’s participation in tennis. Axiomatically, these factors can best be ascertained by use of nominal scale since the cardinal

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Healthy People and Your Community - Discussion - Essay Example The hospital has developed an initiative whereby patients are assigned to primary care physicians who are charged with the task of overseeing them to prevent cases in which a simple case can turn into an emergency one. This has further proved fruitful after the hospital conducted a program of educating the people around on how best to handle illnesses to avoid last minute emergencies in hospitals (Healthy People 2012). The hospital facility has built various units around the place to facilitate easy access by patients. These units provide the requisite healthcare services that most of the patients need at any given time. The hospital has also partnered with respective health insurance companies in charge of providing covers to clients who need health care. This is because most people who do not have insurance covers cannot easily receive healthcare, are more likely to die because of lack or inadequate provision of healthcare and are likely to have poor health status(Healthy People 2012). The hospital has developed effective transport systems, with ready ambulances with first aid nurses who move patients with emergency cases to the nearest health facility with ease. These health facilities have enough doctors who work in shifts to ensure no patients wait longer either in emergency departments or outpatient departments. This goes on well even with other hospital departments such as labs, which ensure the tests required are conducted and treatment made within the shortest time possible (Healthy People 2012). The disparity comes in terms of racial and social discrimination as Blares and Hayes (2010) describe, which to some extend is reduced but still there among elderly health workers. This creates fear among the minority who might be suffering yet they need healthcare services. To reduce this problem, the government needs to incorporate the minority healthcare workers in the profession, to reduce the gap. This will increase the

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Concept Application Project Essay Throughout the semester I have explored many topics in sociology. While exploring these topics, three main theoretical perspectives were used. I will briefly illustrate each of the main theoretical perspectives of functionalism, conflict theory, and symbolic Interactionism. During this semester I have watched two films, Food Incorporated and The Vernon Johns Story. I will describe how a theoretical perspective is used in each of these examples. Then I will provide my own two examples where concepts and theoretical perspectives can be illustrated. My First example is the Boston Marathon Bombings and the second is the Mass Media’s coverage of the Boston Bombings. The Functionalist Perspective is a sociological perspective that emphasizes each part of society contributing to the survival of that society. In Sociology in Modules, they define the functionalists perspective as, â€Å"A sociological approach that emphasizes the way in which the parts of a society are structured to maintain its stability (Schaefer 15). Read more:  Conflict Perspective on Social Media † The functionalist perspective can be compared to the human body model. Each part of the body performs specific tasks. For example, our legs allow us to walk or run and our lungs allow us to breathe. Without each and every body part, one simply cannot perform to the maximum potential. Now when a functionalist is looking at a society, they may see different social groups that contribute to a larger population. The Conflict Perspective is a sociological perspective that views the world as a constant struggle. In our textbook, Sociology in Modules, they define the conflict perspective as, â€Å"A sociological approach that assumes that social behavior is best understood in terms of tension between groups over power or the allocation of resources, including housing, money, access to services, and political representation (Schaefer 15). † There are many areas where conflict can arise in today’s society. Religious groups, political parties, and different social classes, may all have conflicting views with other or opposite groups. Examples of the conflict perspective include means of production versus labor and the concentration of wealth. In recent history, the conflict perspective is becoming more popular. With, â€Å"The widespread social unrest resulting from battles over civil rights, bitter divisions over the war in Vietnam, the rise of the feminist and gay liberation movements, the Watergate political scandal, urban riots, and confrontations at abortion clinics have offered support for the conflict approach (Schaefer 16). † Groups in society with different viewpoints often pose a great threat to conflicting parties. The Interactionist Perspective is the third main sociological perspective where the traditional way of thinking comes from typical human interaction between groups. Sociology in Modules defines the interactionist perspective as, â€Å"generalizations about everyday forms of social interaction in order to explain society as a whole (Schaefer 17). † The interactionist perspective is also know as symbolic interactionism. I believe it is much easier to look at it from a symbolic interactionism perspective because symbols are easier to understand. From a symbolic interactionist perspective, one may see the world we live in as full of objects. These objects can come on the form of people, places, things, thoughts, feelings, or symbols. Symbolic interactionism looks at these symbols to characterize groups by their symbol. Each symbol may be different. For example, a symbol could be the type of color of car you drive, what you wear to work or school everyday, or even tattoos. Groups in society are often characterized by their symbols. These symbols allow people with similar symbols to communicate with ease. Food Incorporated is a documentary film that portrays the corporate farming industry in the United States as unhealthy, harmful, abusive, and inhumane. Food Inc. the movie really gave me something to think about, it only reinforced my beliefs to eat healthy and support organic and free-range grass fed meats. The most meaningful thing to me was when one of the contributors said the corporate farming industry only wants to grow their products â€Å"bigger, fatter, cheaper, faster†. This agribusiness in only in it for the sake of business and they don’t see the other side. On the other side there are these products that are being mass-produced in factory farms. This seemingly only affects the lower class Americans who can only afford the cheapest of food products at the super market. From a financial standpoint, it only makes sense that people are forced to consume such low quality products at their demise. As the conflict theory would describe it, this is a constant struggle between the producer and the consumer. The producers are producing animal products in close quarter factory farms and feeding them corn, which is not a naturally occurring meal. Specifically cattle and chickens are given hormone shots to make them grown bigger, fatter, and faster. These farms do not treat the animals well at all. The animals live in horrible conditions, often times in their own manure. This causes disease to reach to food that eventually people eat. There are cases that come up all the time where products need to be pulled from the shelves in stores because of contaminated foods. The Vernon John’s story is a true story turned into a movie that portrays a Minister, Vernon John, who leads the African Americans in the fight for civil rights. This film demonstrated the development of social change in the south. First, the blacks do not measure up to the whites in social class. They often held position in social that were not important of looked down upon. For example, the position that Vernon John holds is viewed as a conflict by white law enforcement officials. During the early 1900s, Black Americans were being segregated from society. Secondly, During this time, African Americans were not recognized by society as having any value other than slavery. Race and ethnicity played a large role in society during this time. African American Racial groups formed and they were discriminated against. Vernon John is a leader of social change. He stepped up and faced the danger in speaking his views. The movie illustrates two great examples of hate crime in the 1920s. The first is when Vernon John was driving in his car late at night to bring a girl who had been raped to the hospital. The white policemen pulled Vernon John over and just antagonized him for no reason. Another example is when part of Vernon John’s church was set on fire. This was obviously planned by the white Americans out of hatred for Vernon Johns following and community. The blacks were heavily being discriminated against. Third, the government used force and power to exercise their will against Vernon John and the Black Americans. The movie demonstrates a great example of what goes on in society today. Although the United States may not be going through the exact same situation of discrimination as the 1900s, we are still facing sorts of discrimination and hate crimes today. Which leads me into my next example, the recent Boston Marathon bombings. The Boston Marathon bombings is an alleged terrorist attack that happened during the finish of the 2013 Boston Marathon. On April 15th, 2013, two Muslim brothers from Massachusetts detonated two explosives near the finish line of the Marathon, killing three people and injuring more than 200 people. The 2013 Boston Marathon Bombings display the conflict some people have with society. I am not in the head of the bombers or the investigators so I am only speaking from an outside perspective. With that being said, I cannot imagine what they were thinking when setting off these two explosions in front of thousands of people. From the suspects point of view, they must have seen the world from a conflict perspective. They must have believed that they didn’t fit into society. In a Wall Street Journal article, one suspect claims â€Å"he and his brother were angry about the U. S. wars in Afghanistan and Iraq and the killing of Muslims there† (Authorities Say Bomb Suspects Planned NYC Attack). My only guess is that their hatred for the United States is so fierce that they concluded in carrying out these horrible acts. It appears that other groups from over seas heavily influenced the suspects. This is just one example of how government, religion, and cultural differences can become conflicting in society. The mass media can influence the coverage of any story by the time it reaches the public. The mass media is defined by Sociology in Modules as, â€Å"print and electronic means of communication that carries messages to widespread audiences† (Schaefer 153). The leverage they have is huge in what information/sources they have and what they release. In the coverage of the Boston Bombings, the media helped the public understand of what precautions they should take around the threatened area. The media also helped people from across the country understand what was happening in Boston. In this case, I believe the media did a good job in providing accurate information to the public. However, this is not always the case. The conflict view states that gatekeeping can control what information reaches the public. For example the media can choose on which pieces of news to report on, leaving out specifics that could totally twist the story. They can also choose which sources they want to use which may also have an affect on the outcome of the story. Not all social classes have access to certain news sources. Many sources are behind a pay wall, which prohibits some potential viewers from accessing the information. The functionalist view would say that the mass media plays a role in society that keeps it moving forward. Sociology in Modules says, â€Å"the mass media is to occupy our leisure time—from newspaper comics and crossword puzzles to the latest music releases on the Internet. While that is true, the media have other important functions. They also socialize us, enforce social norms, confer status, and promote consumption† (Schaefer 154). This is all very true and it reinforces our viewpoints of the media. Overall, multiple theoretical perspectives can portray the mass media. Indeed, concepts and theoretical perspectives learned in class are used to illustrate events in society today. First, the example of the Vernon John’s story gives one the ability to see the upbringing of social change through the civil rights movement. The second example of the Food Inc. production is one that produces for profit without taking into consideration all the ethical and health needs of American citizens. Third, my example of the Boston Marathon Bombings illustrates conflict and hates crimes in our culture today. Lastly. The mass media acts as an agent between information and the public through print and electronic versions. The conflict and functionalists theoretical perspectives can be used to analyze the mass media. Therefore, social concepts and theoretical perspectives are used throughout the society we live in today. ? Works Cited Authorities Say Bomb Suspects Planned NYC Attack. WSJ. com. Associated Press, 26 Apr. 2013. Web. 26 Apr. 2013. Food, Inc. Dir. Robert Kenner. Movie One, 2008. DVD. Schaefer, Richard T. Sociology In Modules. New York: McGraw-Hill, 2011. McGrawHills Connect. Web. 4 Apr. 2013. The Vernon Johns Story. Dir. Kenneth Fink. 1994. DVD.

Graduation Speech -- Graduation Speech, Commencement Address

Good evening. A couple weeks ago, I was attempting to clean my room when I unearthed an old yearbook from my days in middle school. Rather absentmindedly I opened the book to browse through it. However, before long I became immersed in the memories brought back to life and quickly lost track of time. Over an hour later, I set the book aside and marveled at how much had changed since then. Not only had people changed physically, but they had also changed their friends, habits and behaviors. Furthermore, we have all grown as a result of the changing world around us, a changing world that has witnessed the tragedy of Sept. 11, 2001, as well as the constant birth of new technologies which make our lives easier. These changes have shaped new outlooks on life, along with the way we perceive ourselves. The concept of change is as timeless as history itself. Change is inevitable, whether it be changes in your statues from a student to an adult, changes in your path in life or simply changes in your appearance as you approach old age. While change can, at times, appear menacing, it ...

Agree or Disagree with Dissections

Why Do We Dissect ? The art of dissection allows for people to gain knowledge about the organisms around them in a very unique way. Dissection involves the cutting open and examination of animals or plants. Some of the earliest dissections date back to the third century where they were performed by Greek physicians. They used dissections as a means of gaining a broader understanding of their own species. Today dissections are an essential part of life. Dissections are popularly used in autopsies to determine means of death and by students to gain a better understanding of animal and human body. I personally think dissections are the best way to learn about our own bodies through examining other animals. This is because of homology or similarities between certain animals and humans. I’ve experienced homology in frog dissections. The internal structure of the frog was similar to the internal structure of the human body. Dissections were performed live and virtually. The live dissection of the frog allowed me to gain a true understanding of the organ systems compared to a virtual dissection done on the computer. I believe live dissections are better, they allowed me to learn more about the specimen by providing a better sense of the size and structure of the specimen. Through a live dissection I also gained lab experience in using dissection tools, safety procedures and equipment. When preparing for a lab practical a live dissection is more sufficient than a virtual dissection. It is easier to identify internal structures when you’ve examined them up close In conclusion dissections are one of the best means of gaining knowledge about the body and internal structure of a specimen. They allow for humans to discover homology between them and other animals such as frogs. Dissections can be performed live or virtually and to me live dissections are supreme because they allow for a more in depth and hands on examination. Thus leading to a better understanding of the specimen. | |

Biography of Artemisia Gentileschi, Italian Baroque Artist

Artemisia Gentileschi (July 8, 1593–date unknown, 1653) was an Italian Baroque painter who worked in the Caravaggist style. She was the first female painter admitted to the prestigious Accademia de Arte del Disegno. Gentleschis art is often discussed in connection to her biography: she was raped by an artist colleague of her father and she participated in the prosecution of the rapist, two facts that many critics connect with the themes of her work. Today, Gentileschi is recognized for her expressive style and the remarkable achievements of her artistic career. Fast Facts: Artemisia Gentileschi Known For: Italian Baroque artist who painted in the Caravaggist styleBorn: July 8, 1593 in Rome, ItalyDied: circa 1653 in Naples, ItalyNotable Achievement: Gentileschi was the first woman to become a member of the Accademia di Arte del Disegno in Florence, founded by Cosimo I deMedici.Selected Artwork: Judith Slaying Holofernes (1614-1620), Jael and Sisera (1620), Self-Portrait as the Allegory of Painting (1638-39) Early Life Artemisia Gentileschi was born in Rome in 1593 to Prudentia Montoni and Orazio Gentileschi, a successful painter. Her father was friends with the great Caravaggio, the father of the dramatic style that would come to be known as the Baroque. The young Artemisia was taught to paint in her father’s studio at a young age and would eventually take up the trade, though her father insisted she join a convent after the death of her mother in childbirth. Artemisia could not be deterred, and eventually her father became a champion of her work. Trial and Its Aftermath Much of Gentileschi’s legacy lies in the sensationalism surrounding her rape at the hands of her father’s contemporary and her painting teacher, Agostino Tassi. After Tassi refused to marry Gentileschi, Orazio brought his daughter’s rapist to trial. There, Gentileschi was made to repeat the details of the attack under the duress of an early truth-telling device called a sibille, which progressively tightened around her fingers. By the trials end, Tassi was found guilty and sentenced to five years banishment from Rome, which he never served. Many speculate his punishment was not enforced, as he was a favorite artist of Pope Innocent X. After the trial, Gentileschi married Pierantonio Stiattesi (a minor Florentine artist), had two daughters, and became one of the most desirable portrait painters in Italy. Career as a Painter Gentileschi achieved great success in her lifetime—a rare degree of success for a female artist of her era. An incontestable example of this is her admittance to the prestigious Accademia del Disegno, founded by Cosimo de Medici in 1563. As a member of the guild, Gentileschi was able to purchase paints and other art materials without the permission of her husband, which proved to be instrumental when she decided to separate herself from him. With newfound freedom, Gentileschi spent time painting in Naples and later in London, where she was summoned to paint at the court of the King Charles I around 1639. Gentileschi was also patronized by other noblemen (among them the powerful Medici family) and members of the Church in Rome. Notable Artwork Artemisia Gentileschis most famous painting is of the Biblical figure of Judith, who beheads the general Holofernes in order to save her village. This image was depicted by many artists throughout the Baroque period; typically, artists represented the character of Judith as either the temptress, who uses her wiles to lure a man who she later kills, or the noble woman, who is willing to sacrifice herself to save her people. Gentileschi’s depiction is unusual in its insistence on Judith’s strength. The artist does not shy away from depicting her Judith as struggling to sever the head of Holofernes, which results in an image both evocative and believable. Judith and Holofernes (c. 1611).   Getty Images Many scholars and critics have likened this image to a self-portrait of revenge, suggesting that the painting was Gentileschi’s way of asserting herself against her rapist. While this biographical element of the work could be true—we do not know the psychological state of the artist—the painting is equally important for the way it represents Gentileschis talent and her influence on Baroque art. This is not to say, however, that Gentileschi was not a strong woman. There is much evidence of her confidence in herself as a female painter. In many of her correspondences, Gentileschi referenced the difficulty of being a female painter in a male dominated field. She was vexed by the suggestion that her work might not be as good as that of her male counterparts, but never doubted her own ability. She believed her work would speak for itself, responding to one critic that her painting would show him what a woman can do. Self-portrait as the Allegory of Painting (La Pittura), Artemisia Gentileschi. Public Domain / Google Cultural Institute   Gentileschis now famous self-portrait, Self-portrait as the Allegory of Painting, was forgotten in a cellar for centuries, as it was thought to have been painted by an unknown artist. That a woman could have produced the work was not considered possible. Now that the painting has been properly attributed, it proves to be a rare example of a combination of two artistic traditions: the self portrait and the embodiment of an abstract idea by a female figure—an achievement that no male painter could create himself. Legacy Though her work was well-received during her lifetime, Artemisia Gentileschi’s reputation floundered after her death in 1653. It is not until 1916 that interest around her work was revived by Robert Longhi, who wrote about Artemisia’s work in conjunction with her father’s. Longhi’s wife would later publish on the younger Gentileschi in 1947 in the form of a novel, which focused on the dramatic unfolding of her rape and its aftermath. The inclination to dramatize Gentileschis life continues today, with several novels and a movie about the artist’s life. In a more contemporary turn, Gentileschi has become a 17th century icon for a 21st century movement. The parallels of the #metoo movement and the testimony of Dr. Christine Blasey Ford in the Brett Kavanaugh hearings put Gentileschi and her trial back into the public consciousness, with many citing Gentileschi’s case as evidence that little progress has been made in the intervening centuries when it comes to public responses to female victims of sexual violence. Sources Fine, Elsa Honig.  Women And Art: A History Of Women Painters And Sculptors From The Renaissance To The 20Th Century. Allanheld Schram, 1978, pp. 14-17.Gotthardt, Alexxa. Behind The Fierce, Assertive Paintings Of Baroque Master Artemisia Gentileschi.  Artsy, 2018, https://www.artsy.net/article/artsy-editorial-baroque-master-artemisia-gentileschi. Accessed 4 Dec 2018.Jones, Jonathan. More Savage Than Caravaggio: The Woman Who Took Revenge In Oil.  The Guardian, 2016, https://www.theguardian.com/artanddesign/2016/oct/05/artemisia-gentileshi-painter-beyond-caravaggio.ONeill, Mary. Artemisias Moment.  Smithsonian Magazine, 2002, https://www.smithsonianmag.com/arts-culture/artemisias-moment-62150147/.Parker, Rozsika, and Griselda Pollock.  Old Mistresses. 1st ed., Pantheon Books, 1981, pp. 20-26.