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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/30009355/taxonomic-interpretation-of-allopatric-mammalian-forms-on-the-example-of-two-karyoforms-of-microtus-terricola-subterraneus-rodentia-arvicolinae-from-eastern-europe
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/30009345/first-finding-of-a-representative-of-giant-mustelids-of-the-genus-eomellivora-carnivora-mustelidae-in-russia-tuva-upper-miocene
#11
A V Lavrov, D O Gimranov
In the late Miocene deposits in the Taralik-Cher locality (Tuva Republic), fossil remains of a giant mustelid of the genus Eomellivora Zdansky, 1924 have been found. This finding is the first reliable evidence of the Eomellivora inhabiting the modern Russia. Teeth of the Eomelliovra from Taralik-Cher are similar in size to those of E. wimani and E. piveteaui from the late Miocene in Eurasia. The morphology of teeth of the material from Tuva is most similar to that of E. ursogulo; therefore, it is considered a small form of Eomellivora ursogulo...
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009344/discovery-of-the-late-changhsingian-bivalve-complex-and-two-fauna-extinction-episodes-in-northeastern-asia-at-the-end-of-the-permian
#12
A S Biakov, R V Kutygin, N A Goryachev, S S Burnatny, A N Naumov, A V Yadrenkin, I L Vedernikov, M F Tretyakov, I V Brynko
A late Changhsingian bivalve complex including species from the genera Palaeonucula, Dacryomya, Malletia ?, Sarepta ?, Myalina, Pteria, Maitaia, and Unionites is discovered in northeastern Asia for the first time. The transition from the Permian to the Triassic in high-boreal basins has been shown to include two extinction episodes similar to those observed in the low-boreal basins and apparently evoked by trap volcanism activation in Siberia. Changes in benthic foraminifera diversity and vertical distribution of ammonoidea of the genus Otoceras in transitional Permian-Triassic deposits also are considered...
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/30009343/the-responses-of-neurons-of-the-somatosensory-cortex-to-stimulation-of-the-posterior-thalamus-po-in-wag-rij-rats-genetically-predisposed-to-absence-epilepsy
#13
D A Tsvetaeva, E Yu Sitnikova, V V Raevsky
In genetically predisposed WAG/Rij rats and healthy Wistar rats, we studied functioning of the paralemniscal region of the thalamo-cortical system. The responses of neurons of the somatosensory cortex to single electrical stimulation of the posterior nucleus of the thalamus were recorded in two- to three-monthold rats within the period when the epileptic activity was not developed. We revealed lower number of shortterm inhibitory responses in WAG/Rij rats as compared to Wistar rats. This may create preconditions for the spreading of spike-wave activity in the somatosensory cortex, which is an electrophysiological sign of absence epilepsy...
May 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29790032/is-the-center-of-origin-of-long-tailed-hamster-cricetulus-longicaudatus-milne-edwards-1867-rodentia-cricetidae-located-in-tibet
#14
N S Poplavskaya, A A Bannikova, Y Fang, B I Sheftel, M V Ushakova, A V Surov, V S Lebedev
First data on morphological and mitochondrial variation in the long-tailed hamster Cricetulus longicaudatus is presented. In contrast to genetically monomorphic populations of Mongolia and Tuva, the northeastern part of the Qinghai-Tibetian Plateau was found to harbor several divergent mtDNA lineages. This pattern suggests a recent expansion of the long-tailed hamster to the northern part of its recent range, which started from Tibet, presumably, in the late Middle Pleistocene. Several populations from the northern edge of the species range were found to be morphologically but not genetically distinct...
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29790031/effect-of-selenium-containing-biocomposites-from-medicinal-mushrooms-on-the-potato-ring-rot-causative-agent
#15
A I Perfileva, O M Tsivileva, Ya B Drevko, D N Ibragimova, O V Koftin
The impact of selenium biocomposites obtained from the medicinal macrobasidiomycetes Ganoderma lucidum, Grifola umbellata, Laetiporus sulphureus, Lentinula edodes, and Pleurotus ostreatus on the viability and biofilm formation capability of the phytopathogenic Gram-positive bacterium Clavibacter michiganensis ssp. sepedonicus (Spieck. et Kotth.) (Cms) was studied. Impairment of bacterial cell viability resulting from their incubation with biocomposites was shown. The decisive role of the composites' selenium component on the biological activity under question was established...
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29790030/molecular-heterogeneity-of-lectins-in-wheat-seedlings-under-the-action-of-stevioside-and-heavy-metals
#16
A L Mikhailov, O A Timofeeva, Yu Yu Nevmerzhitskaya, V F Mironov
The effect of the diterpene glycoside stevioside and high concentrations of heavy metals on the molecular heterogeneity of lectins was studied in seedlings of Kazanskaya 560 winter wheat cultivar. Stevioside induced the emergence of a new 45-kDa lectin. Cultivation of wheat seedlings in CdSO4 and ZnSO4 solutions resulted in the emergence of the protein with Mr = 88 kDa. We detected the presence of both lectins in seedlings during combined treatment with stevioside and heavy metals.
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29790029/a-new-functional-role-of-oxytocin-participation-in-osmoregulation
#17
Yu V Natochin, D V Golosova, E I Shakhmatova
After a water load in rats hyperhydration occurs and the secretion of oxytocin increases by the neurohypophysis. This increases the water diuresis, the water is quickly excreted by the kidney, and the recovery of osmotic homeostasis is accelerated.
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29790028/stimulus-for-glucagon-like-peptide-1-secretion-in-rats
#18
Yu V Natochin, A V Kutina, A S Marina, E I Shakhmatova
Blood concentration of glucagon-like peptide-1 (GLP-1) increased 5 min after per os administration of water, sodium chloride solution, or glucose solution. Changes in blood osmolality or blood glucose level did not stimulate GLP-1 release. A method of short-term increase in the gastric capacity in rats using an inflating balloon attached to the Foley catheter was developed in order to test the hypothesis that excitation of the upper gastrointestinal tract receptors is a primary signal for the GLP-1 secretion during oral intake of the substances...
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29790027/the-influence-of-pre-and-postnatal-factors-on-early-behavior-formation
#19
A Yu Shishelova, V V Raevsky
The maternal impact on the early behavioral responses in pups was studied in cross-fostering experiments with the newborn Wistar rats (the primiparous females were fostering the pups born to the females parturiated for the second time and vise versa). The maternal experience had a significant influence on the function development in both pre- and postnatal periods. Specific features of prenatal ontogeny of pups born by experienced females resulted in further, more stable development of the early behavioral responses...
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29790026/pathogenetic-role-of-the-stress-induced-release-of-glucocorticoid-hormones-in-the-development-of-post-traumatic-stress-disorder-an-experimental-study
#20
M Y Zenko, K A Baranova, E A Rybnikova
In the rat experimental model of posttraumatic stress disorder (PTSD), the level of blood corticosterone was at least eight-fold increased (an overrelease). The use of hypobaric hypoxic preconditioning or short-term inhibition of glucocorticoid synthesis by metyrapone injection prevented development of the experimental PTSD.
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
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