Evaluation of Effective Composite Biosorbents Based on Wood Sawdust and Natural Clay for Heavy Metals Removal from Water.

Bentonitic clay and wood sawdust are natural materials widely available in nature at low cost with high heavy metals sorption properties that, in this work, were combined to achieve an effective composite biosorbent with high sorption properties and enhanced mechanical stability. Pine, aspen, and birch wood sawdust, as well as different bentonite clays and different sawdust modification methods (HPO or HCl) were used for preparing new composite biosorbents. A mixture of wood sawdust and bentonite in a ratio of 2:1 was used.

[Determination of sulfur-containing amino acids in food products].

To define the most accurate method for determination of sulfur-containing amino acids in foods, the possibility was tried of using a method suggested by Moore. The method is based on preliminary oxidation of cystine and methionine by performic acid and transformation of these substances to acid hydrolysis resistant cysteic acid and methionine sulphone. Model experiments and use of foods (wheat flour, grade II, and protein part of chicken egg) demonstrated that exposure of proteins to performic acid brings about oxidation of sulfur-containing amino acids to the hydrolysis-resistant forms which may be defined by chromatography with a greater accuracy.

[Nitrogen-containing fractions of Soviet hydrolysates for parenteral feeding].

The content of free amino acids, non-precipitable and precipitable trichloro-acetic acid peptides in Soviet-made hydrolysates for parenteral alimentation was determined. As shown, it is aminopeptide and aminosol that contain the greatest amounts of amino acids, fibrinosol and caseine hydrolysate carrying their least quantities, with aminocrovine and hydrolysine occupying an intermediate place in this respect. The quality of hydrolysates was assessed according to their biological value and to do so chemical numbers of essential amino acids were calculated and limiting factors determined.

[Amino acid composition of proteins of the membranes of rat liver sucellular structures and the effect of protein deficiency on it].

The protein amino acids composition of nuclear, mitochondrial and lysosomic membranes and those of the endoplasmatic reticulum of the liver in rats receiving for 30 days rations with normal (18.5 per cent) and low (4 per cent) protein content was investigated. The amino acid spectra of proteins forming part of various cytomembranes, in spite of their considerable resemblance, are shown to have traits of a definite specificity.