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Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections

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https://www.readbyqxmd.com/read/30171471/a-finding-of-the-red-squirrel-rodentia-sciuridae-sciurus-vulgaris-linnaeus-1758-and-forest-dormouse-rodentia-gliridae-dryomys-nitedula-linnaeus-1778-in-the-pleistocene-of-the-southern-urals
#1
T V Fadeeva, P A Kosintsev, D O Gimranov, A G Yakovlev, V V Gasilin, N A Plasteeva, N G Smirnov
The study deals with a new sample of the mammalian fossils from the Pleistocene deposits of the Ignatievskaya Cave in Southern Urals (54°53' N, 57°46' E). Among the rodent fossils, the teeth of red squirrel (Sciurus vulgaris) and forest dormouse (Dryomys nitedula) have been identified. The enamel differentiation quotient (SDQ) of the water vole teeth matches the Arvicola terrestris species from locations of the end of Middle and Late Pleistocene (oxygen isotope stages, OIS 6 and OIS 5-2, respectively). The high SDQ value for the water vole and the presence of the squirrel and dormouse in the fauna allow dating the finding near the end of the Middle Pleistocene and beginning of the Late Pleistocene (OIS 6 and OIS 5e, respectively)...
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171470/comparative-analysis-of-the-amino-acid-spectrum-of-blood-plasma-in-chiroptera-vespertilio-murinus-l-1758-and-myotis-dasycneme-b-1825-in-the-fauna-of-the-ural-mountains
#2
V A Mishchenko, L A Kovalchuk, V N Bolshakov, L V Chernaya
The article presents the results of a new comparative analysis of free amino acids in the blood plasma of representatives of insectivorous Chiroptera (Mammalia: Vespertilionidae) in the fauna of the Ural Mountains: the pond bat (Myotis dasycneme Boie, 1825) and the parti-colored bat (Vespertilio murinus Linnaeus, 1758). This is the first study to show the species variability of free amino acids in resident and migratory species of bats from different ecosystems of the Ural Region.
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171469/papillomatous-skin-netting-of-cetaceans-cetacea-delphinapterus-leucas-balaena-mysticetus-and-eschrichtius-robustus-and-sirens-sirenia-trichechus-manatus-and-dugong-dugon
#3
O F Chernova, A B Kiladze, O V Shpak
The structure of the papillomatous junction between epidermis and dermis (papillomatous netting, PN) in the skin of cetaceans (white whales, bowhead, and gray whales) and sirens (American manatee, dugong) was studied and compared using histophysiological and morphogeometric methods. The relative extent of PN development proved to be similar in members of both orders, but significant differences were found in PN configuration, the volume of "free area of grille", the degree of skin vertical compression, and skin density, which influence buoyancy...
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171468/comparative-analysis-of-the-concentrations-of-ions-na-k-ca-2-and-cl-%C3%A2-in-the-blood-of-the-brown-trout-salmo-trutta-from-different-rivers
#4
E D Pavlov, D S Pavlov
The contents of ions in the blood have been compared in three ecological groups of brown trout (parr, mature, and resident) living in rives of the basins of Lake Onega and Lake Ladoga. Brown trout from the Alats-oya (the Ladoga basin, remote from two other rivers belonging to the Onega Lake) is characterized by the lowest concentrations of the Na+ , Ca2+ , and Cl- ions in blood. The probable effect of the ion level in blood of brown trout on selection of life strategy is discussed.
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171467/electric-organ-discharges-of-cyphomyrus-petherici-mormyridae-osteoglossiformes-from-the-white-nile-basin
#5
V D Baron, A A Orlov, A S Golubtsov
The waveform and some characteristics of the electric organ discharges have been studied in 11 individuals of Cyphomyrus petherici, the only representative of the genus in the Nilotic fauna. The discharge is characterized by three to five phases with a prevalence of the second phase in terms of the relative amplitude and a wide variability of the total duration of discharge (from 212 to 558 μs). The comparison of the discharges of the species under study with those in the congeneric species and representatives of the genus Pollimyrus (which previously encompassed C...
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171466/participation-of-the-green-algae-ulvaria-obscura-in-bioremediation-of-sea-water-from-oil-products
#6
G M Voskoboinikov, G G Matishov, L O Metelkova, Z A Zhakovskaya, E M Lopushanskaya
Participation of green algae in bioremediation of sea water from oil products (OPs) has been studied. Decrease in the content of OPs in water is accompanied by their accumulation by the alga Ulvaria obscura (Chlorophyta). It has been assumed that neutralization of OPs in Ulvaria occurs, similarly to Fucus vesiculosus (Phaeophyta), all over the thallome: destruction of OPs starts on the alga surface by epiphytic hydrocarbonoxidizing bacteria providing absorption and subsequent degradation of OPs by plant cells...
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171465/influence-of-the-background-noise-on-recognition-of-signals-with-a-complex-spectrum-structure-in-the-beluga-whale-delphinapterus-leucas
#7
E V Sysueva, A Ya Supin, D I Nechaev, V V Rozhnov, M B Tarakanov, V V Popov
The frequency resolving power of hearing (FRP) of the beluga whale Delphinapterus leucas was studied as dependent on influence of lasting low-intensity sounds (of the ultrasonic range from -20 to +10 dB). Testing of the spectrum ripple-phase reversal was used in conjunction with a noninvasive recording of auditory evoked potentials. FRP parameters were found to depend nonmonotonically on the intensity of the background noise. The resultant adaptation effects can be explained by the fact that, in response to the high-intensity signals, the auditory system sensitivity is reduced to the level optimal for analysis of these signals...
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171464/the-effects-of-weak-static-magnetic-field-on-the-development-of-organotypic-tissue-culture-in-rats
#8
P N Ivanova, S V Surma, B F Shchegolev, N I Chalisova, G A Zakharov, E A Nikitina, A D Nozdrachev
The effects of weak static magnetic field on the organotypic tissue culture of the rat cerebral cortex, liver, and spleen have been investigated. Exposure to a 200 μT static magnetic field induces tissue development, leading to the intensification of regeneration processes compared to the control explants.
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171463/evaluation-of-individual-risk-factors-of-alcohol-preference-in-rats
#9
A Yu Egorov, I V Demianko, E V Filatova
We evaluated individual risk factors of the development of alcohol preference in a model of voluntary alcohol consumption. Drinking behavior was estimated in the two-bottle test, and other behavioral features were studied in the open field test, test for social interaction, and marble burying test. The low adaptive capacity of an animal, which was manifested in a shorter time spent in the center of the open field, and low consumption of ethanol when the animal first tasted it were the leading factors of the subsequent preference of alcohol under the conditions of free choice...
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30171462/study-of-uridine-effect-on-the-development-of-audiogenic-tonic-seizures-in-krushinsky-molodkina-strain-rats
#10
I B Fedotova, G M Nikolaev, O V Perepelkina, N V Belosludtseva, G D Mironova, I I Poletaeva
The latency of tonic seizure in response to loud sound (in rats of the Krushinsky-Molodkina strain with audiogenic epilepsy) had been slightly (although statistically significantly) longer after chronic uridine injections (100 mg/kg, i.p., three times a day during 9 or 12 days). The recovery time from the tonic seizure was shorter after 12 days of injections in comparison to the 9-day injection period. At the same time, the intensity of tonic seizures provoked by loud sound did not change after chronic uridine injections...
July 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009355/taxonomic-interpretation-of-allopatric-mammalian-forms-on-the-example-of-two-karyoforms-of-microtus-terricola-subterraneus-rodentia-arvicolinae-from-eastern-europe
#11
M I Baskevich, A S Bogdanov, L A Khlyap, E A Shvarts, E M Litvinova
New European pine vole records from the Novgorod, Kaluga, Voronezh, and Belgorod oblasts were studied by sequencing of the mtDNA cytb gene (1143 bp) and by karyotyping (routine staining and G-banding techniques). The results enabled us to summarize chromosome variability of this species throughout Eastern Europe. In the sample studied, two geographically replacing chromosomal forms have been identified: northern, 2n = 54 (Novgorod and Kaluga oblasts), and southern, 2n = 52 (Voronezh and, presumably, Belgorod oblasts)...
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009354/distribution-of-polychaeta-communities-in-the-west-spitsbergen-area-in-winter-december-2015
#12
D R Dikaeva, E A Frolova
Using the materials collected in 2015, modern data have been obtained on the polychaete species composition and quantitative distribution in the West Spitsbergen area in winter. Polychaete species complexes corresponding to different habitat conditions have been identified in the outer and inner parts of the bays. The distribution of the Polychaeta communities proved to be dependent on the bottom sediment composition, depth, and specific hydrological regime.
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009353/the-effect-of-weather-conditions-on-eutrophication-in-the-neva-river-estuary
#13
M S Golubkov, S M Golubkov
Analysis of long-term data on chlorophyll a and total phosphorus concentrations, plankton primary production, organic matter mineralization, and weather conditions in the middle of summer in 2003-2017 revealed eutrophication processes in the Neva River estuary. Weather conditions in the region exerted a strong effect on organic matter prodaction and mineralization processes in the estuary. Rainy and cold summers of the recent years promoted massive development of algae due to increased washout of nutrients from the catchment area, but the rate of organic matter mineralization in the water column was reduced because of low water temperature...
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009352/ortho-phthalic-acid-esters-suppress-the-phytopathogen-capability-for-biofilm-formation
#14
T N Shafikova, Y V Omelichkina, A G Enikeev, S V Boyarkina, D E Gvildis, A A Semenov
This is the first study demonstrating that ortho-phthalic acid esters, dibutylphthalate (DBP) and di-(2-ethylhexyl)-o-phthalate (DEHP), inhibit the ability to form biofilms of the biotrophic pathogen Clavibacter michiganensis ssp. sepedonicus and Pectobacterium carotovorum ssp. carotovorum necrotroph. Inhibition of biofilm formation depends on the DBP and DEHP concentrations.
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009351/the-impact-of-winter-meteorological-parameters-on-abundance-of-the-grey-partridge-perdix-perdix-in-the-southern-ural-steppe
#15
E V Barbazyuk, A A Chibilyov
In the winter periods from 1994 to 2017, the grey partridge average abundance in the steppe zone of the southern Urals was significantly negatively correlated with some meteorological parameters (the snow cover height, precipitations, snow density). At the same time, in the subsequent summer period, these winter parameters (including the mean air temperature) had no influence on the bird number. Indeed, the harsh and snowy winters did not affect the grey partridge abundance in the reproductive period. We believe that migrations from the breeding area or nomadic movements of these birds occurred in the most extreme winters...
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009350/viable-nematodes-from-late-pleistocene-permafrost-of-the-kolyma-river-lowland
#16
A V Shatilovich, A V Tchesunov, T V Neretina, I P Grabarnik, S V Gubin, T A Vishnivetskaya, T C Onstott, E M Rivkina
We have obtained the first data demonstrating the capability of multicellular organisms for longterm cryobiosis in permafrost deposits of the Arctic. The viable soil nematodes Panagrolaimus aff. detritophagus (Rhabditida) and Plectus aff. parvus (Plectida) were isolated from the samples of Pleistocene permafrost deposits of the Kolyma River Lowland. The duration of natural cryopreservation of the nematodes corresponds to the age of the deposits, 30 000-40 000 years.
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009349/structure-and-ultrastructure-of-the-acrotrichis-grandicollis-coleoptera-ptiliidae-compound-eyes-and-the-eye-features-related-to-miniaturisation
#17
A A Makarova, A A Polilov
Here is the first description of the visual organ of Acrotrichis grandicollis, a member of Ptiliidae family that includes the smallest free-living insects. The apposition eyes of A. grandicollis have the acone-type crystalline cone; a fused rhabdom is formed by eight retinula cells and surrounded by primary pigment cells. Secondary pigment cells are located only in the distal part of the ommatidium under the lens. The eye consists of about 50 facets about 12 μm in diameter. The A. grandicollis ommatidium ultrastructure has been compared with that of large Coleoptera...
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009348/isotopic-composition-of-blood-of-polar-bears-ursus-maritimus-of-the-kara-barents-sea-population
#18
E A Ivanov, I N Mordvintsev, N G Platonov, S V Naidenko, A V Tiunov, V V Rozhnov
The data on the content of carbon and nitrogen isotopes in the blood samples of polar bears obtained in the present study confirm that polar bears in the Taimyr region (and the Kara-Barents sea population in general) are partly dependent on the resources of terrestrial origin. However the "terrestrial carbon" evidently reaches bears' tissues indirectly, via marine food webs utilizing organic carbon brought into the polar basin by Siberian rivers.
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009347/phosphorus-budget-of-lake-baikal-and-the-angara-cascade-water-reservoirs-modeling-reconstruction-and-prognosis
#19
V V Boulion
A mass balance model of phosphorus flow in a system of connected water reservoirs has been developed and used for quantitative assessment of phosphorus budget elements in Lake Baikal and water reservoirs on the Angara River, the only river that drains Lake Baikal.
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009346/deuterium-oxide-enhances-escherichia-coli-sos-response-induced-by-genotoxicants
#20
S K Abilev, S V Smirnova, E V Igonina, V N Parmon, N K Yankovsky
It has been demonstrated that deuterium oxide enhances the SOS response of Escherichia coli cells induced by chemical genotoxicants and mutagens. This demonstrates that the heavy nonradioactive hydrogen isotope deuterium can be considered to be a comutagen.
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
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