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Palatal Sound is a model of vocal tract articulation influenced by physiologic and acoustic analysis of the voice. Specifically, the term articulation refers to all movement within the vocal tract that results in open, filter-like sonorities, as well as in turbulent to absolute airflow modification. This model presents a complete mapping of place within the vocal tract that features flexibility ac
The article is devoted to legal acts on combating corruption. The author gives a classification and review of these legal acts. The article analyzes not only legal acts specifically aimed at preventing corruption, but also other legal acts and a wide range of measures that create the necessary conditions and a favorable environment in this regard. The author emphasizes that it is important to keep
Reactions between lactic acid and alcohols or carboxylic acids catalyzed by lipase from Candida antarctica were evaluated with hexane as solvent. Lactic acid was a good acyl donor and esters of both primary and secondary alcohols were effectively synthesized. No interfering dimer formation due to lactic acid acting as both nucleophile and acyl donor was observed. In agreement with this, no esterif
A commercially available radioimmunoassay (RIA) kit was used to study the effects of organic solvents on antigen-antibody interactions. The RIA analysis was carried out in aqueous-organic two phase systems. After exposure to hydrophobic organic solvents the antibodies retained full binding capacity, while less hydrophobic solvents caused partial inactivation of the antibodies. A practical analysis
The shape of the profiles of enzyme activity versus water activity for four different lipases were independent of the reaction used to determine the activity. The profile for each lipase (Rhizopus arrhizus, Pseudomonas sp., Candida rugosa and Lipozyme) in esterification, hydrolysis and transesterifications profiles were the same. In transesterification the yield was unaffected by the water activit
Polyacrylamide beads and celite were used for immobilization of bovine α-chymotrypsin and lipase B from Candida antarctica. Polyacrylamides with a high degree of cross-linking afforded high catalytic rates when used as immobilization matrices. Derivatization of the polymer with carboxyl and tertiary amino groups prior to immobilization caused no significant changes in α-chymotrypsin behavior. The
The influence of reaction temperature on synthesis activity, product yield and nucleophile specificity for α-chymotrypsin and subtilisin Carlsberg were studied. The enzymes were immobilized on Celite and used in acetonitrile with a water content of 10%. Acyl-transfer reactions with Ac-PheOEt as acyl donor and 11 different amino acid amides and 3 dipeptides as nucleophiles were studied. The decreas
Differential scanning calorimetry was the method to investigate the thermostability of chymotrypsin. The transition temperature decreased by approx. 30°C when the dry enzyme became highly hydrated. High degree of hydration corresponded to extensive conformational changes during protein denaturation, reflected by large enthalpy values. Sorbitol, lyophilized together with the enzyme, caused the dest
The thermal inactivation of lyophilized chymotrypsin was studied at controlled water activities. At 60 °C the enzyme showed good stability except at aw 0.97, whereas at 75 °C considerable inactivation occured at most water activities. Increasing the amount of buffer on the preparation decreased the stability significantly. The optimal temperature of enzymatic activity was increased 14 °C, when the
Acyl migration in 2-monoolein dissolved in solvents under conditions common in lipid modification reactions has been studied. The effects on acyl migration of solvent, incubation temperature, water activity, polar additives and solid additives have been investigated. Extensive acyl migration occured in aliphatic hydrocarbons and water-miscible alcohols under dry conditions. The acyl migration rate
