SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 145 papers in Biology & Life Sciences
This paper applies an epitaxial model of eutectic crystallization to biological tissues, comparing metallic eutectics with muscle, connective tissue, and mineralized skeletal structures. It argues that, as in eutectic melts where small crystals of one component grow in crystallographically parallel …
This study examines the hexagonal crystal structure of bovine liver catalase and the form and quaternary organization of its molecules. Electron micrographs of negatively stained crystals were quantitatively processed, and an algorithm exploiting P3₁21 symmetry was used to reconstruct spatial protei…
This paper formulates a local decision rule for animal behavior under a homeostatic principle in which organisms minimize the time integral of weighted deviations from normal physiological states. Starting from a law of exclusivity that permits only one need reducing reaction at a time, it models al…
This paper investigates weak anomalous luminescence that may arise from the second excited singlet state of chlorophyll-type molecules under intense ruby laser excitation. Solutions of chlorophyll a, chlorophyllin, methylchlorophyllide, and phthalocyanines were examined using filtered laser excitati…
This study examines the origin of ultraweak luminescence observed in aqueous DNA solutions after irradiation. Using chemiluminescence measurements, hydroperoxide analysis, temperature variation, pH control, irradiation under argon, and inhibition by propyl gallate, the authors compare luminescence d…
This paper determines the structure and stereochemical relationship of the alkaloid vincarine, isolated from the roots of Vinca erecta. Using mass spectrometry, NMR, UV and IR spectroscopy, acetylation, reduction, and oxidation reactions, the authors refine its formula to C21H24O3N2 and identify key…
This paper examines low-temperature fluorescence polarization spectra of porphine, chlorin, and octaethylporphine in frozen glassy solutions, with the aim of testing assignments of electronic-vibrational bands and the symmetry of active normal vibrations in porphyrin molecules. Using monochromatic e…
This paper examines the mechanism by which radicals in irradiated proteins recombine in the presence of oxygen, with particular attention to whether the process includes chain oxidative recombination rather than only direct peroxide radical termination. Casein and bovine serum albumin were gamma irr…
The paper examines the alkaloid composition of the aerial parts of Vinca erecta collected in the Tashkent region and compares changes in total alkaloid content across stages of plant development. Using ether extraction, fractionation into phenolic and nonphenolic bases, buffer separation, chromatogr…
This study examines the enzymatic activation of fifteen amino acid analogues in the presence of the total pH 5 enzyme fraction from Escherichia coli B, using the hydroxamate assay to detect formation of aminoacyl adenylate intermediates. Four analogues, ethionine, norleucine, 3-fluorotyrosine, and b…
This paper examines the mechanism underlying mutarotation and gel formation in gelatin solutions after cooling from the denatured state. Using polarimetric measurements over a wide range of gelatin concentrations in water and citrate buffer, the authors show that the initial rate of increase in levo…
This paper develops a sorption dynamics treatment of tritium isotope exchange during filtration of tritiated water through porous hydrogen-containing media, considering water-saturated, dry, and partially saturated columns. Using equilibrium front-motion equations and isotope distribution coefficien…
This study examines the alkaloid composition of Corydalis gortschakovii and Corydalis pseudoadunca collected in the Zaalai Range. Total alkaloids were obtained by chloroform extraction and separated into phenolic and nonphenolic fractions, followed by crystallization, derivative formation, spectral …
This study examines the alkaline hydrolysis of mixed A and H blood group substances from pig stomach mucosa, with the aim of clarifying the general architecture of these glycopeptide biopolymers and the nature of alkali-labile linkages. Degradation products formed under sodium hydroxide, with or wit…
This paper examines the alkaloid composition of Ungernia severtzovii collected from several localities and plant organs, using solvent extraction, salt formation, alumina chromatography, melting point comparison, elemental analysis, optical rotation, infrared spectra, and chemical transformations. T…
This study examines two flavonoid pigments isolated from the roots and rhizomes of licorice, Glycyrrhiza glabra L., designated L-7 and L-8. Using chromatographic isolation, physicochemical characterization, spectral analysis, enzymatic hydrolysis, molecular rotation comparisons, and ultraviolet irra…
This study examines how functional groups and molecular structure affect the radiolytic behavior of amino acids, peptides, and cottonseed globulin. Dry polycrystalline samples were irradiated under vacuum at low and room temperatures, and radical yields and electron paramagnetic resonance spectra we…
This study examines hydrazinolysis of pyrimidine nucleosides and DNA under milder aqueous conditions intended to preserve the nucleic acid polymer. The authors tested uridine, cytidine, thymidine, adenosine, and guanosine as functions of hydrazine concentration, pH, and temperature, and identified p…
This paper examines deposition of coarse dispersed aerosols in vegetation, arguing that wind driven inertial capture by plant surfaces can exceed gravitational settling. Field observations using horizontal and vertical glass collectors are combined with a diffusion model in which vegetation is repre…
This study examines a monoclinic crystalline modification of porcine pepsin as a potential object for complete X-ray crystallographic structure determination. Pepsin was purified, crystallized from acidic 20 percent ethanol solution by Northrop’s method, mounted in sealed capillaries, and analyzed u…
This paper develops a theoretical treatment of how climatic factors influence photosynthesis and productivity in plant canopies. Starting from a kinetic relation between carbon dioxide assimilation and photosynthetically active radiation, it formulates vertical profiles of radiation, carbon dioxide …
This study examines how the size and branching of alkyl substituents in O-ethyl-S-alkylmethylthiophosphinates influence their inhibition of horse serum cholinesterase. A series of compounds bearing tert-butyl or isopropyl groups at different distances from the phosphorus atom was synthesized, and in…
This study examines flavonoid constituents of the above-ground parts of Far Eastern lily of the valley, Convallaria keiskei. Ethanol extraction, purification, polyamide chromatography, hydrolysis, paper chromatography, elemental analysis, and UV and IR spectroscopy were used to isolate and character…
This study examines how modifications of the uracil nucleus in uridine diphosphate glucose analogs affect their participation in oxidation by UDPG dehydrogenase. Using a purified calf liver enzyme preparation, the authors measured NAD reduction, glucuronic acid formation, reaction rates at saturatin…
This paper investigates whether neutral saponifiable lipids contain alcohol components other than glycerol, a possibility suggested by earlier anomalies in lipid analyses. Neutral lipid fractions from corn and sunflower seeds, mutton fat, cod liver, and soil yeasts were examined by silica gel and th…
This study examines the decomposition kinetics of peroxide compounds formed in aqueous DNA solutions after X-ray irradiation, with attention to their possible role in radiation aftereffects. Using spectrophotometric determination of hydroperoxides at different temperatures, the authors show that dec…
This study examines how radical intermediates formed during oxidation of the radical-process inhibitor propyl gallate affect sulfhydryl groups in rabbit muscle lactate dehydrogenase. Using amperometric titration, polarographic monitoring of propyl gallate oxidation, and enzyme activity assays, the a…
