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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/29536406/functional-orientation-of-biochemical-processes-in-female-beluga-%C3%A3-sterlet-acipenser-ruthenus-linnaeus-1758-%C3%A3-huso-huso-linnaeus-1758-hybrids-in-the-reproductive-cycle
#1
G F Metallov, E N Ponomareva, M N Sorokina, V A Grigoryev, A A Korchunov
The article reports data on the dynamics of blood parameters and parameters of protein, fat, and water-salt metabolism in female starlet × beluga hybrids kept under artificial conditions in the period of reproductive cycle. Gonad maturation in female hybrids in the artificial environment causes clear changes in the biochemistry of blood and of urine.
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536405/the-priming-of-potato-plants-induced-by-brassinosteroids-reduces-oxidative-stress-and-increases-salt-tolerance
#2
M V Efimova, V A Khripach, E V Boyko, M K Malofii, L V Kolomeichuk, O K Murgan, A N Vidershpun, E A Mukhamatdinova, V V Kuznetsov
This is the first study to show that brief pretreatment of potato plants with two brassinosteroids differing in structure causes in plants the ability to react to delayed salt stress by accumulation of compounds with antioxidant activity and by increased salt tolerance.
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536404/soft-bottom-communities-in-marine-lakes-sisjajarvi-and-linjalampi-barents-sea
#3
Yu V Deart, M V Pereladov, V A Spiridonov, T I Antokhina, A V Rzhavsky, T A Britayev
Based on the data of benthic surveys of 2010-2012, three benthic communities: a shallow-water community with the dominance of Scoloplos spp., Nucula tennuis, and Scalibregma inflatum; a deep-water community with the dominance of Chaetosone sp.; and a community of mixed sediments, have been distinguished in soft sediments in marine lakes Sisjajarvi and Linjalampi. These communities are typically marine and similar to other communities in shallow areas of the Barents Sea. They mostly differ in a high abundance of the polychaete Scalibregma inflatum and a small number of echinoderms from the communities in other bays of the Barents Sea...
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536403/morphogenetic-effects-of-resettlement-of-mole-voles-ellobius-talpinus-pall-1770-from-the-southern-population-to-the-northern-boundary-of-the-species-range
#4
A G Vasil'ev, V N Bol'shakov, I A Vasil'eva, N G Evdokimov, N V Sineva
Geometric morphometry has been used to reveal transformations of mandible morphogenesis in the offspring of mole voles resettled to the northern part of the species range from a southern population. The transformations were new compared to both the original (southern) and the aboriginal (northern) populations. A significant increase in the intragroup morphological disparity estimated by the mean nearest neighbor distance (MNND) in the resettled animals compared to both aboriginal populations is an indirect indication of an increased developmental instability in the resettled animals exposed to new climatic conditions...
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536402/protonephridial-excretory-system-in-vestimentifera-siboglinidae-annelida
#5
N N Rimskaya-Korsakova, N P Karaseva, E N Temereva, V V Malakhov
Ultrastructural study of the excretory tree of vestimentifera Ridgeia piscesae has shown that it consists of tubules that are blind at their distal ends. The tubules are lined with ciliated cells and have one or two multiciliated terminal cell(s) at the distal ends. In the tubule walls, there are putative ultrafiltration sites. The excretory tree tubules are interpreted as the secondary protonephridia.
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536401/influence-of-the-male-axillary-extracts-on-regulation-of-menstrual-cycles-in-women
#6
V V Voznessenskaya, T K Laktionova
The effect of male axillary extract on the length and regularity of the menstrual cycle in women was studied in a long-term experiment (9 months). The male secret extract had no statistically significant influence on the menstrual cycle duration in the reproductive-age women (21-45 years) with normal (26-32 days) and regular cycles or in women with abnormally short (<26 days) cycles. In the group of the reproductive-age women with irregular and abnormally long (>32 days) cycles, as well as in the group of the premenopauseage women (46-51 years) with irregular cycles, the secret extract caused a significant shortening of the menstrual cycle as compared to the control...
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536400/molar-microwear-of-narrow-headed-vole-microtus-gregalis-pall-1779-depending-on-the-feed-abrasiveness
#7
S V Zykov, Yu E Kropacheva, N G Smirnov, Yu V Dimitrova
In the narrow-headed vole, enamel microwear of the first mandibular molar (of the protoconid and entoconid anterior enamel wall) was studied under the laboratory conditions and at the fixed feed composition. The classic parameters and the area of the enamel prism lesion were taken into account. The enamel lesion patterns caused by the tooth-tooth and tooth-food interactions have been determined. Differences were found between the voles kept on feed with different abrasive properties, as well as between the lingual and buccal conids of the first mandibular molar...
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536399/comparative-study-of-pygidial-organization-in-polychaetes-of-the-families-nephtyidae-and-syllidae
#8
V V Starunov, O V Zaitseva
The first comparative study of the polychaete pygidial region has been performed using confocal scanning microscopy and immunohistochemical methods. Fundamentally new data has been obtained on the pygidial organization in representatives the Nephtyidae and Syllidae families. Despite differences in the overall morphology of pygidium, it is characterized by a certain structural plan as a whole that can be the basis for that of all polychaetes. Some insignificant differences in the pygidial structure can be either species-specific or consequences of mutations and seem to have no fundamental importance for the general organization...
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536398/a-new-stem-placental-mammal-from-the-early-cretaceous-of-mongolia
#9
A V Lopatin, A O Averianov
A new taxon of stem placentals, Hovurlestes noyon gen. et sp. nov. from the Early Cretaceous of Mongolia (Höovör locality) is described. The new taxon differs from members of the genus Prokennalestes from Höovör in the single-rooted canine and the presence of cusp e, which is an enhancing interlocking between anterior molars (m1 and m2). Hovurlestes noyon gen. et sp. nov. is one of the rarest mammal taxa from Höovör, which expands morphological diversity of the earliest Eutheria.
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536397/on-the-modes-of-the-formation-of-the-exoskeleton-in-early-jawless-vertebrates-osteostraci-agnatha
#10
O B Afanassieva
Based on recently obtained original and published data on the fine structure of the external skeleton of osteostracan agnathans (Osteostraci, Agnatha), possible modes of the formation of their hard cover in the course of the horizontal growth of the exoskeleton are characterized. The developmental models for the formation of various configurations of cephalothoracic shields typical for osteostracans are revealed. It is shown that, in the morphogenesis of the hard cover of this group of early vertebrates, a significant part of the variants of the exoskeleton horizontal growth characteristic of early vertebrates are observed...
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29536396/sharpening-of-the-signal-spectrum-contrast-as-a-result-of-lateral-suppression-in-the-human-auditory-system
#11
A Ya Supin, D I Nechaev, V V Popov, E V Sysueva
The spectrum contrast threshold for the comb-filtered signal was measured at various ripple densities in listeners with normal hearing. The lowest spectrum contrast thresholds of less than 0.1 appeared at a ripple density of 3-4 oct-1 . With the ripple density falling down to 1 oct-1 , the threshold increased to 0.17. At the ripple density higher than 4 oct-1 , the threshold was also growing to achieve 1.0 at a density of 7-8 oct-1 . An increase of threshold at high ripple densities can be explained by integration within critical bands...
January 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299810/finds-of-fragmentary-bird-skeletons-in-the-middle-miocene-of-the-northern-caucasus
#12
N V Zelenkov
The first anatomically assembled skeletal remains of Neogene birds in Russia have been found. The head and a fragment of the vertebral column of a duck (Anatidae) and a hind limb of a perching bird (Passeriformes) from the Middle Miocene of the Krasnodar Region (Tsurevsky Formation) comprise the earliest known Miocene birds from European Russia. The skull of a very small duck (smaller than any extant species of Eurasian ducks) shows a combination of morphological characters characteristic of the extant species of Tadorna and Nettapus, and could belong to a representative of the fossil genus Mioquerquedula...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299809/status-epilepticus-induced-by-pentylenetetrazole-increases-short-term-synaptic-facilitation-in-the-hippocampus-of-juvenile-rats
#13
T Yu Postnikova, A M Trofimova, A V Zaitsev, L G Magazanik
We studied the effect of status epilepticus (SE) on short-term synaptic plasticity. The amplitudes of field potentials in response to extracellular stimulation of the Schaffer collaterals were recorded in hippocampal slices. Subtle modifications were revealed on day 1 after SE, whereas on days 3 and 7 we did not find any differences from the control. These data show that, one day after SE, the probability of a transmitter release in hippocampal synapses decreases that serves as a compensatory mechanism, which prevents seizure activity...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299808/abundance-estimate-of-the-okhotsk-sea-population-of-the-bowhead-whale-balaena-mysticetus-linnaeus-1758
#14
O V Shpak, I G Meschersky, D M Kuznetsova, A N Chichkina, A Yu Paramonov, V V Rozhnov
Abundance of 388 ± 108 whales for the Okhotsk Sea bowhead whale population based on individual genotyping was estimated using the capture-recapture method for the open population model. The data demonstrate that this endangered population shows no signs of recovery.
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299807/early-cretaceous-mammals-from-the-khamryn-us-and-shalan-ikher-localities-in-mongolia
#15
A V Lopatin
New material of Early Cretaceous mammals from Mongolia, including dentary fragments of Gobiconodon borissiaki Trofimov, 1978 and G. hoburensis (Trofimov, 1978) from the well-known dinosaur locality Khamryn-Us (Dornogovi aimag) and a maxilla fragment of G. borissiaki from the new locality Shalan-Ikher (Övörkhangai aimag), is presented. The new data extend the knowledge on the morphology and intraspecific variability of Gobiconodon and the distribution of the Höovör Mammalian Assemblage in Mongolia.
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299806/role-of-%C3%AE-fetoprotein-in-differentiation-of-regulatory-t-lymphocytes
#16
V A Chereshnev, V P Timganova, S A Zamorina, M S Bochkova, P V Khramtsov, M D Kropaneva, M B Raev
The effect of native α-fetoprotein (AFP) on the expression of T-regulatory lymphocyte (Treg) markers by activated CD4+ lymphocytes with different proliferative status was studied. α-Fetoprotein did not affect the ratio of proliferating and non-proliferating activated CD4+ cells. In the study of Treg differentiation, it was found that AFP at concentrations of 50 and 100 μg/mL significantly inhibited the number of nonproliferating CD4+ FOXP3+ and CD4+ FOXP3+ HELIOS+ lymphocytes without affecting the expression of Treg markers by proliferating CD4+ lymphocytes...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299805/changing-of-the-dynamics-modes-in-populations-with-age-and-sex-structure
#17
O L Revutskaya, M P Kulakov, G P Neverova, E Ya Frismana
Using a mathematical model of the number dynamics in a population with age and sex structure, the relationships were studied between the number of newborns and that of mature females and males. In addition, we studied transitions between different modes of population dynamics which were dependent on changes in not only the population parameters, such as reproduction intensity, survival, and self-regulation, but also in mating pair formation. Population dynamics was found to manifest multistability; i.e., the alternative dynamics modes were observed at the same values of the population parameters but under different initial conditions...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299804/two-models-of-the-sound-signal-frequency-dependence-on-the-animal-body-size-as-exemplified-by-the-ground-squirrels-of-eurasia-mammalia-rodentia
#18
A A Nikol'skii
Dependence of the sound-signal frequency on the animal body length was studied in 14 ground squirrel species (genus Spermophilus) of Eurasia. Regression analysis of the total sample yielded a low determination coefficient (R2 = 26%), because the total sample proved to be heterogeneous in terms of signal frequency within the dimension classes of animals. When the total sample was divided into two groups according to signal frequency, two statistically significant models (regression equations) were obtained in which signal frequency depended on the body size at high determination coefficients (R2 = 73 and 94% versus 26% for the total sample)...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299803/initial-data-on-biological-activity-of-taiga-steppe-soils-in-the-lower-reaches-of-the-kolyma-river
#19
M V Schelchkova, S P Davydov, D G Fyodorov-Davydov, A I Davydova, G G Boeskorov, N G Solomonov
Microbiological and enzyme activities of extrazonal taiga-steppe soils in the lower reaches of the Kolyma River have been studied for the first time. Contrary to north-taiga cryometamorphic soils, predominating in the area, microbial cenoses under herb-sedge petrophytic and grass-sagebrush-herb thermophytic steppes are characterized by features typical for arid soils. The saturation of the soil profile with microorganisms is greater, and the development of actinomycetes is more intensive. The enzyme complex is characterized by high activity of dehydrogenases...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29299802/hcv-coinfection-of-the-hiv-infected-patients-with-discordant-cd4-t-cell-response-to-antiretroviral-therapy-leads-to-intense-systemic-inflammation
#20
K V Shmagel, L B Korolevskaya, E V Saidakova, N G Shmagel, V A Chereshnev, L Margolis, D Anthony, M Lederman
The level of proinflammatory markers was assessed in HIV-infected patients that were coinfected with hepatitis C virus (HCV) and had failed to restore the CD4+ T cell counts (immunological nonresponders, INR) during the antiretroviral therapy (ART). Among four patient groups (HIV+ HCV- and HIV+ HCV+ subjects with the concordant response to ART; HIV+ HCV- and HIV+ HCV+ subjects that were INR), the greatest systemic inflammation was in the latter group. The maximum difference was between the subjects HIV+ HCV- INR and HIV+ HCV+ INR: the blood of coinfected patients contained significantly higher concentrations of the IP-10, sCD163, sTNF-RI, and sTNF-RII and of bacterial lipopolysaccharide...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
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