Combined Irradiation by Gamma Rays and Carbon Nuclei Increases the C/EBP- β LIP Isoform Content in the Pituitary Gland of Rats.
This study also confirms the earlier hypothesis about the alterations of the hypothalamic-pituitary-adrenocortical axis in response to moderate doses of ionizing radiation. PMID: 31732897 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - September 1, 2019 Category: Biology Authors: Anokhina IP, Anokhin PK, Kokhan VS Tags: Dokl Biol Sci Source Type: research

Responses of Aquatic Organisms to Cyanobacteria and Elodea in Microcosms.
Abstract The aim of the present study is investigation of the impact of mass development of cyanobacteria and Elodea on population characteristics (abundance, biomass, fecundity) and "health" parameters (the state of embryos, heart rate, and thermal resistance) of aquatic invertebrates in experiments with controlled conditions. In July-August 2018, in four variants of microcosms, the conditions were modeled characteristic of the coastal zone of the Rybinsk Reservoir in the period of mass development of cyanobacteria. Mass species were placed in microcosms of planktonic (with domination (80%) Daphnia long...
Source: Doklady Biological Sciences - September 1, 2019 Category: Biology Authors: Verbitsky VB, Kurbatova SA, Berezina NA, Korneva LG, Meteleva NY, Makarova OS, Sharov AN, Ershov IY, Malysheva OA, Russkikh YV, Chernova EN, Borisovskaya EV Tags: Dokl Biol Sci Source Type: research

Personality Influences Risk of Parasitism in Fish.
Abstract Influence of fish personality on infection rate is poorly studied. In the experiments on young-of-the-year Oncorhynchus mykiss and cercariae of the trematode Diplostomum pseudospathaceum, we tested the hypothesis that infection rate differs between more and less active ("bold" and "shy") fish. Will individual differences in infection persist upon re-infection? Fish serve as a second intermediate host for this trematode. Positive correlation was found between the results of consecutive infections. Accumulation of parasites with successive infections leads to an aggregated distribution o...
Source: Doklady Biological Sciences - September 1, 2019 Category: Biology Authors: Mikheev VN, Pasternak AF, Taskinen J Tags: Dokl Biol Sci Source Type: research

Morphological Variability of the Mandible Shape of the Common Vole Microtus arvalis (Rodentia, Arvicolidae) Semi-species from the Hybrid Zone.
Abstract The mandible shape of the common vole semi-species from the hybrid zone was studied for the first time using the methods of geometric morphometry. The hybrid specimens were found to display high morphological variability being closer to the parental Microtus obscurus than to M. arvalis form. The main trends of changes in the mandible shape were primarily observed in the horizontal plane. PMID: 31732900 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - September 1, 2019 Category: Biology Authors: Mironova TA, Sycheva VB, Martynov AA, Gromov AR, Kostin DS, Komarova VA, Krivonogov DM, Lavrenchenko LA Tags: Dokl Biol Sci Source Type: research

Jasmonic Acid Enhances the Potato Plant Resistance to the Salt Stress in Vitro.
Abstract The protective effect of jasmonic acid (JA) was evaluated under the stress conditions (100 mM NaCl). The potato plants Solanum tuberosum L, mid-season variety Lugovskoy, were used in the experiments. The plant-regenerants were grafted and grown in test tubes on the modified Murashige and Skoog agar medium in the absence (control) or presence of JA at concentrations of 0.001, 0.1, and 10 μM under the optimal conditions or with addition of NaCl. After 28 days of cultivation, the growth (stem and root lengths, tier and leaf numbers, and plant mass) and physiological (proline and photosynthetic pigment con...
Source: Doklady Biological Sciences - September 1, 2019 Category: Biology Authors: Efimova MV, Mukhamatdinova EA, Kovtun IS, Kabil FF, Medvedeva YV, Kuznetsov VV Tags: Dokl Biol Sci Source Type: research

Analysis of the Healthy Subject Response to Prolonged Contact with Tuberculosis Patients.
Abstract Prolonged contact of healthy subjects with Mycobacterium tuberculosis can change their blood formula and immune status, thus reflecting adaptive reactions to constant antigenic load. The peripheral blood analysis of health care workers in a tuberculosis hospital demonstrates changes in cell populations which prevent development of tuberculosis, in particular, CD4+ Т cells and CD3+ Т cells. It is shown that the number of the memory CD4+ Т cells specific to M.tuberculosis antigens which produce interferon gamma depends on the duration of work contact with tuberculosis patients. The use of health care wor...
Source: Doklady Biological Sciences - September 1, 2019 Category: Biology Authors: Litvinov IS, Dolgikh DA Tags: Dokl Biol Sci Source Type: research

Immunohistochemical and Morphological Study of Periodontal Tissues in Predicting the Results of Dental Implantation in Patients with Chronic Periodontitis.
Abstract Morphological and immunohistochemical examination was made on 24 gum biopsies obtained from 35- to 60-year-old patients with diagnosis of partial secondary adentia, chronic generalized moderate to severe periodontitis (19 patients), as well as on the biopsy samples from five patients without pathological periodontal changes who underwent dental implantation. Serial paraffin sections were treated with antibodies against Ki-67, VEGF, and SMA. In patients with severe chronic periodontitis, a high proliferative activity of epithelium indicative of hyperplastic changes was observed, as well as a reduced number...
Source: Doklady Biological Sciences - September 1, 2019 Category: Biology Authors: Kulakov AA, Kogan EA, Brailovskaya TV, Vedyaeva AP, Zharkov NV Tags: Dokl Biol Sci Source Type: research

Influence of Cranial Irradiation with High-Energy Protons on the Visuomotor Behavior in Monkeys.
Abstract The visually driven instrumental conditioning of a single monkey (Macaca mulatta) was conducted after single-dose cranial irradiation with high-energy protons. The monkey executed saccades toward the visual stimuli and then responded by manually pressing right or left lever for stimuli in right or left half-field, respectively. The percentage of correct responses with dominant right hand exceeded the percentage of such responses with left hand and temporarily decreased two months after irradiation. A month later, the percentage of correct right-hand responses returned to the level before irradiation. No s...
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Latanov AV, Tereschenko LV, Ostrovsky MA Tags: Dokl Biol Sci Source Type: research

Bioinorganic Markers of a Loss of the Crystalline Lens Capsule Barrier Properties and Consequent Age-Related Cataract Development.
Abstract The age-related cataract development consequent upon a loss of the lens capsule barrier properties proved to be associated with accumulation of sodium, calcium, phosphorus and potassium. For the first time the use of spatial cluster and correlation analyses showed that the physical light scattering in the crystalline lens volume depends on changes in the lens matter elemental composition. The fields of elevated concentrations of sodium, calcium, phosphorus, potassium and chlorine conformed to the lens capsule geometry and their clustering was similar to that of opacity fields in the lens body. The accumul...
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Pakhomova NA, Borisenko TE, Novikov IA, Avetisov SE Tags: Dokl Biol Sci Source Type: research

Helminthes in the Small Intestine of the Common Eider (Somateria mollissima) from the Eastern Murman: Impact on the Host Digestive Activity and Physiological State.
Abstract In this ecological and physiological study of the common eider (Somateria mollissima) nesting on the coast of Eastern Murman, the species composition of the bird helminth fauna, as well as the infection quantitative parameters, were determined. The common eider small intestine proved to be infected with trematodes of the genus Microphallus; three species of cestodes, namely, Lateriporus teres (Cestoda: Dilepididae), Fimbriarioides intermedia (Cestoda: Hymenolepididae), and Microsomacanthus diorchis (Cestoda: Hymenolepididae); and one species of acanthocephalan, Polymorphus phippsi (Palaeacanthocephala: Po...
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Kuklina MM, Kuklin VV Tags: Dokl Biol Sci Source Type: research

Stimulation of Seed Germination by Humic Substances: On the Nature of the Phenomenon.
Abstract The wheat seed germination and seedling growth, as well as the effect of humic substances on seed development, were compared using soils and sand as substrates. Russian Plain soils were found to considerably inhibit seed germination. Pre-sowing treatment with humic preparations resulted in a significant stimulation effect on seeds sowed into sod-podzolic soil, but not into sand. Considering a well-known phenomenon of soil allelelotoxicity, we have suggested that stimulation of seed development by humic substances is a result of seed protection by them against the allelotoxin inhibitory effect. PMID: ...
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Shoba SA, Salimgareeva OA, Gorepekin IV, Fedotov GN, Stepanov AL Tags: Dokl Biol Sci Source Type: research

Harmful Parasitoses on the Russian Southern Far East under Climatic and Demographic Changes.
Abstract Progressive expansion of the most hazardous human parasitoses caused by trematodes, cestodes and nematodes has been found on the south of the Russian Far East. Decelerating expansion of the trematode Clonorchis sinensis, an agent of clonorchiasis towards the southern Primorye Territory from the Amur River basin, that began 10-15 years ago, was revealed. A prognosis was made on the activation of the natural foci of clonorchiasis and paragonimiasis. Circulation possibilities are discussed of the highly pathogenic trematode Pagonimus heterotremusar in the South Asian regional ecosystems. Our experiments show...
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Bogatov VV, Besprozvannykh VV, Prozorova LA Tags: Dokl Biol Sci Source Type: research

Experimental Study of Rheoreaction of the European River Lamprey Lampetra fluviatilis (L.) Downstream Migrating Smolts under Various Illumination.
Abstract Rheoreaction of the downstream migrating smolts of the European river lamprey was studied in the experimental conditions at illuminations of day and night intensity. It was found that at the daytime the smolts are mostly dormant and if move downstream then in active-passive form (with the head against the stream, and their speed going beyond the velocity). This data is well within the findings on the night downstream migration of the smolts during the 24h period in natural conditions. Thus, the downstream migration of the smolts has an active form. PMID: 31571078 [PubMed - in process] (Source: Doklad...
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Zvezdin AO, Pavlov DS, Tsimbalov IA, Kucheryavyy AV Tags: Dokl Biol Sci Source Type: research

Occurrence of the Giant Deer of the Genus Arvernoceros in Taurida Cave, Crimea.
Abstract The giant deer Arvernocerosverestchagini David, 1992, authochtonous species of the Early Pleistocene biota of North Black Sea coastal area, is discovered in Crimea. The giant deer was a member of fossil fauna of vertebrates from the Pleistocene deposits of Taurida karst cave. According to biochronological data, this fauna is dated to 1.8-1.5 Ma. PMID: 31571079 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Vislobokova IA, Titov VV, Lavrov AV, Startsev DB, Tarasenko KK, Lopatin AV Tags: Dokl Biol Sci Source Type: research

Sex Accent and Biphonation in the Sound Signal of Ground Squirrels (Mammalia, Rodentia).
Abstract The alarm call of the little ground squirrel (Spermophilus pygmaeus), like those of six other Eurasian ground squirrels, contains a high-frequency component. In males, the peak and maximum frequencies of the high-frequency component are higher than in females. Biphonation of the alarm calls of Sp. pygmaeus, Sp. musicus, Sp. xanthoprymnus, and Sp. alaschanicus has been demonstrated, with the low- and high-frequency components generated by different sources in the vocal tract. The material was collected in the field. PMID: 31571080 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Nikol'skii AA Tags: Dokl Biol Sci Source Type: research

Electrogenesis in Two African Upside-Down Catfishes, Synodontis sorex and S. batensoda (Mochokidae, Siluriformes).
Abstract Weak electric discharges generated by the two species of the African upside-down catfishes, Synodontis sorex and S. batensoda are described. In both species two types of discharges were recorded in the course of aggressive-defense interactions in the pairs of individuals: short simple biphasic and longer (duration>20 ms) discharges with more complex waveform. The discharges of the latter type seem to result from a temporal summation (with various latency) of simple discharges. It is suggested that formation of the long quasimonopolar discharges enhances the coincidence of frequency spectrum of the catf...
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Orlov AA, Baron VV, Golubtsov AS Tags: Dokl Biol Sci Source Type: research

Changes in the Regulatory T-Lymphocyte Counts in HIV-Infected Patients with a Discordant Response to Antiretroviral Therapy.
We examined HIV-infected patients with different efficacies of immune system restoration during antiretroviral therapy. The study showed that against the background of low CD4+ T cell counts, subjects with a discordant immunologic response (patients with
Source: Doklady Biological Sciences - July 1, 2019 Category: Biology Authors: Saidakova EV, Shmagel KV, Shmagel NG, Korolevskaya LB, Chereshnev VA Tags: Dokl Biol Sci Source Type: research

Hypothermia-Induced Postrepolarization Refractoriness Is the Reason of the Atrial Myocardium Tolerance to the Bioelectrical Activity Disorders in the Hibernating and Active Ground Squirrel Citellus undulatus.
Abstract The electrophysiological mechanism of the atrial myocardium resistance to the cold-induced arrhythmias was studied in the hibernating ground squirrel Citellus undulatus. The atrial action potentials (APs) and refractoriness were recorded with microelectrodes in isolated multicellular preparations of the atrial myocardium taken from the hibernating and summer active ground squirrels (HS and SAS, respectively) at 37, 27, and 17°С to estimate the AP and refractoriness durations. In both HS and SAS, hypothermia increased the duration of the AP and refractoriness period (APD and RD, respectively), and in ...
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Kuzmin VS, Abramov AA, Egorov YV, Rosenshtraukh LV Tags: Dokl Biol Sci Source Type: research

Chronic Exposure to Ultrasonic Frequencies Selectively Increases Aggression in Rats.
Abstract We studied aggression in male Sprague-Dawley rats in a model of a depressive-like state induced by unpredictable treatment with ultrasonic waves with the frequencies of 20-45 kHz for 1, 2 or 3 weeks. We did not find any increase in the number of animals exhibiting aggression in the "resident-intruder" test after the treatment of any selected duration. However, the aggressive animals exposed to ultrasound exhibited the substantially increased number of attacks and their total duration as well as decreased latency of the first attack compared to the respective indices in the animals of the control...
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Gorlova AV, Pavlov DA, Ushakova VM, Zubkov EA, Morozova AY, Zorkina YA, Inozemtsev AN, Chekhonin VP Tags: Dokl Biol Sci Source Type: research

Siboglinids (Annelida, Siboglinidae) as Possible Hydrocarbon Indicators as Exemplified by the Sea of Okhotsk.
Abstract The geographic and bathymetric distribution of siboglinids in the Sea of Okhotsk was studied. At least 75% of all siboglinid findings were at a depth up to 400 m. Most of them were concentrated in the northwestern part of the shelf. Comparison of the data on siboglinid distribution in the Sea of Okhotsk and the aggregate geological data on hydrocarbon distribution showed that, in the Sea of Okhotsk, siboglinids were mostly in the regions of hydrocarbon manifestations, but they were absent in the central areas with the minimum methane and hydrocarbon concentrations in both benthic sediments and the uppermo...
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Karaseva NP, Gantsevich MM, Obzhirov AI, Shakirov RB, Starovoytov AV, Smirnov RV, Malakhov VV Tags: Dokl Biol Sci Source Type: research

The Provisional Dermal Folds in the Oral Apparatus of the American Paddlefish Polyodonspathula Walbaum, 1858 (Acipenseriformes, Polyodontidae).
Abstract The transitory dermal infoldings are described for the first time in front and behind the upper jaw in the larvae and postlarvae of the American paddlefish, Polyodon spathula Walbaum, 1858. In sturgeons these infoldings are necessary for the jaw protraction. In the paddlefishes, they, probably recapitulate the ancestral state. At the same time, the presence of these folds at the larval stages might indicate that the paddlefish larvae possess the protractive jaws. Further developmental studies of the jaw kinematics in Polyodon spathula are needed to test both hypotheses. PMID: 31317449 [PubMed - in pr...
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Tsessarsky AA Tags: Dokl Biol Sci Source Type: research

Dental Microwear and Mesowear of the Microtus Voles Molars before and after Experimental Feeding of Owls.
Abstract In small mammals, the degree of micro- and mesowear of molars depends on the feed hardness, abrasiveness, and some other characteristics. Analysis of micro- and mesorelief of the paleontological material is used for reconstruction of some animal diet parameters. Small mammals pass through a series of complex transformations on the way from the objects of biocenosis to paleontological objects. Bone remains underwent transformations during accumulation and fossilization. In particular, bone remains from ornithogenous deposits were exposed to the bird digestive system elements. We have experimentally studied...
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Kropacheva YE, Zykov SV, Smirnov NG, Salimov RM Tags: Dokl Biol Sci Source Type: research

Hypolagus brachygnathus (Lagomorpha, Leporidae) from the Lower Pleistocene of the Taurida Cave in Crimea.
Abstract Leporid fossils from the Lower Pleistocene deposits of the Taurida karstic cave discovered in 2018 in central Crimea (Zuya village, Belogorsk district) are referred to Hypolagus brachygnathus (Kormos, 1930). This species is characteristic of the interval from the early Pleistocene (late Villanyian, MN17) to the middle Pleistocene (latest Biharian, Q2) of Europe. It has not been previously observed in Crimea. PMID: 31317451 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Lopatin AV Tags: Dokl Biol Sci Source Type: research

The PorcupineHystrix (Acanthion) vinogradovi (Rodentia, Hystricidae) from the Early Pleistocene Taurida Locality in Crimea.
Abstract The remains of porcupines from the Lower Pleistocene deposits of the Taurida karstic cave discovered in 2018 in central Crimea (Zuya village, Belogorsk district) are referred to Hystrix (Acanthion) vinogradovi Argyropulo, 1941. This species is quite common for the Pleistocene of Eurasia. In Crimea, several isolated teeth of this species were described from the Lower Pleistocene of Tarkhankut previously. PMID: 31317452 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Lopatin AV Tags: Dokl Biol Sci Source Type: research

The Adhesion of Human Dermal Fibroblasts on Anodized Nanotube-layered Titanium, Modified for Implantology Application.
Abstract Anodization of titanium implants is accompanied by the formation of titanium oxide nanotubes improving osseointegration. An excessive fibroblast adhesion on the surface might lead to the formation of fibrous capsule resulting in implant rejection. In our research, we demonstrated that the adhesion activity of human dermal fibroblasts on anodized surface was not elevated, which is promising for the use of titanium with nanotube-layered surface for implantology. PMID: 31317453 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - May 1, 2019 Category: Biology Authors: Fadeyev FA, Khrunyk YY, Belikov SV, Lugovets DV, Gubaeva OV, Karabanalov MS, Leontyev SL, Popov AA Tags: Dokl Biol Sci Source Type: research

The Effect of the Taste Receptor Protein T1R3 on the Development of Islet Tissue of the Murine Pancreas.
Abstract T1R3 protein, the main subunit of the sweet taste receptor and receptor of amino acid taste, is expressed in the epithelium of the tongue and gastrointestinal tract, in β cells of the pancreas, hypothalamus, and numerous other organs. Recently, convincing evidences on the involvement of T1R3 in the control of carbohydrate and lipid metabolism, and the control of incretin and insulin production were obtained. In the study on Tas1r3-gene knockout mouse strain and parent C57BL/6J strain as a control, the data on the effect of T1R3 on morphological characteristics of Langerhans islets in the pancreas wer...
Source: Doklady Biological Sciences - April 26, 2019 Category: Biology Authors: Murovets VO, Sozontov EA, Zachepilo TG Tags: Dokl Biol Sci Source Type: research

Serotonin Modulates Differently the Functional Properties of Damaged and Intact Motoneurons in the Frog Spinal Cord.
Abstract When studying a preparation of the isolated spinal cord segment of an adult frog, damaged and intact lumbar motoneurons were found to differ significantly in the membrane potential, input resistance and the action potential properties (amplitude, duration, fast and medium phases of the afterhyperpolarization, and the frequency of spikes). Serotonin (5-HT) reduced the amplitude of afterpolarization and increased the frequency of the spikes of the intact neurons, while in the damaged motoneurons, 5-HT increased the amplitude of afterpolarization and had no effect on the frequency of discharges. PMID: 3...
Source: Doklady Biological Sciences - April 26, 2019 Category: Biology Authors: Kalinina NI, Zaitsev AV, Vesselkin NP Tags: Dokl Biol Sci Source Type: research

Endothelium-dependent Hyperpolarization-Mediated Relaxation Pathway in Bovine Mesenteric Lymph Nodes.
Abstract Endothelium-dependent relaxation mechanisms have been studied in phenylephrine-precontracted capsules of bovine mesenteric lymph nodes studied in vitro. Tetraethylammonium chloride and TRAM-34 in a solution with L-NAME and Indomethacin, which suppress the production NO and prostacyclin of endothelium, increased the tone of the lymph nodes. We believe that in bovine mesenteric lymph nodes, the dilation mechanism is mediated by hyperpolarization of the endothelium, which is associated with activation of large- and intermedium conductance Ca2+-activated potassium channels. PMID: 31016496 [PubMed - in pr...
Source: Doklady Biological Sciences - April 26, 2019 Category: Biology Authors: Lobov GI, Dvoretskii DP Tags: Dokl Biol Sci Source Type: research

Detection of Endogenous Phthalates in Bacterial Pathogens of Plants and Animals.
Abstract The endogenous esters of orthophthalic acid, dibutyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP), have been first detected in bacterial pathogens of plants (Clavibacter michiganensis ssp. sepedonicus, Pectobacterium carotovorum ssp. carotovorum, Rhizobium rhizogenes, Rhizobium radiobacter) and bacterial pathogens of animal (Escherichia coli). PMID: 31016497 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - April 26, 2019 Category: Biology Authors: Shafikova TN, Omelichkina YV, Boyarkina SV, Enikeev AG, Maksimova LA, Semenov AA Tags: Dokl Biol Sci Source Type: research

Circadian Rhythms and Locomotor Activity of Smolts of the European River Lamprey Lampetra fluviatilis (L.).
Abstract Locomotor activity was investigated in smolts of the European river lamprey at alternation of light and darkness (12/12 h) and in the dark. Two groups of smolts were discerned differing in the level of locomotor activity. The presence of the circadian rhythm in smolts has been revealed, and its role in downstream migration has been shown. The locomotor activity leading smolts to channel flow increases with decreasing illumination at evening twilight. The period of high nocturnal activity is completed a short time before morning twilight, under the action of the individual circadian rhythm. This decreases ...
Source: Doklady Biological Sciences - April 26, 2019 Category: Biology Authors: Zvezdin AO, Pavlov DS, Kucheryavyy AV, Tsimbalov IA Tags: Dokl Biol Sci Source Type: research

Tolerance of Potato Plants to Chloride Salinity Is Regulated by Selective Light.
Abstract Potato plant tolerance to chloride salinity rose after short-term exposure to blue light, which has been first shown in this study. The protective effect of blue light was based on its ability to stimulate the accumulation of low-molecular weight organic compounds with antioxidant activity. PMID: 31016499 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - April 26, 2019 Category: Biology Authors: Kovtun IS, Efimova MV, Malofii MK, Kuznetsov VV Tags: Dokl Biol Sci Source Type: research

On the Analysis of Weak Two-locus Viability Selection and Quasi-linkage Equilibrium.
Abstract A model of weak two-locus viability selection, defined by ordinary differential equations, is analyzed. The weak selection is considered as a perturbation of the model without selection. Using the perturbation theory, the estimation of the coefficient D of linkage disequilibrium was determined in terms of usual concepts of the mean effects in quantitative genetics and in terms of singular perturbation theory in mathematics. The results obtained generalize the ones found by Kimura (for two diallelic loci) in the case of multiple alleles and allow standardizing the analysis of weak effects of systematic fac...
Source: Doklady Biological Sciences - April 26, 2019 Category: Biology Authors: Passekov VP Tags: Dokl Biol Sci Source Type: research

Sympathetic Innervation of Stomach in Postnatal Development.
Abstract Sympathetic innervation of the stomach was studied in rats by the method of retrograde axon transport of Fast Blue in postnatal ontogenesis. The number of labeled neurons increased in the first 10 days of life and then did not change until the senescence. All labeled neurons innervating the stomach contain the catecholamine synthesis enzyme, tyrosine hydroxylase. The proportion of labeled neuropeptide Y-immunopositive neurons did not change in the development, the percentage of labeled calbindin-immunoreactive neurons decreased in the first month of life. PMID: 30603941 [PubMed - in process] (Source:...
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Emanuilov AI, Masliukov PM, Nozdrachev AD Tags: Dokl Biol Sci Source Type: research

Investigation of Whalebone from the Miocene Kovran Locality (Kamchatka Krai, Russia).
Abstract New information on the microstructures, general morphology, and features of preservation of plates of a whalebone from the Miocene Kovran locality in the Kamchatka Peninsula are provided. The plates have a chevron-like bend which is absent in extant Balaenopteridae, Balaenidae, and Eschrichtiidae. This shape is possibly related to the filtration mechanism characteristic of these whales. PMID: 30603942 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Tarasenko KK, Lopatin AV, Pakhnevich AV, Kovalenko ES, Murashev MM, Podurets KM Tags: Dokl Biol Sci Source Type: research

The Earliest Asian Duck (Anseriformes: Romainvillia) and the Origin of Anatidae.
Abstract A new species of the extinct duck Romainvillia from the Upper Eocene of Kazakhstan is described. This is the earliest duck from Asia, the first record of Romainvillia beyond France and the first reliable evidence of the presence of Romainvilliinae (regarded here as family) in Asia. This occurrence shows a wide range of Romainvillia and suggests a greater similarity of Late Eocene faunas of Western Europe and Asia than it was previously thought. The origin of Romainvilliidae and their presumable descendants Anatidae may be connected with adaptation to a new biotope, the shallowing Late Eocene epicontinenta...
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Zelenkov NV Tags: Dokl Biol Sci Source Type: research

Discovery of Trunk Coelomoducts in Hemichordata.
Abstract Histological examination of a specimen of a deep-sea enteropneusts that belongs to a yet undescribed species (Torquaratoridae gen. sp.) revealed numerous trunk coelomoducts. They open into the genital wing coelom as a typical funnels; short ducts communicate with environment through pores located on the outer side of the genital wings. Total number of coelomoducts in a specimen is estimated at several thousand. Trunk coelomoducts have not been found earlier in any member of the phylum. We believe that the release of the male gonad products occurs through coelomoducts of Torquaratoridae gen. sp. PMID:...
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Lukinykh AI, Ezhova OV, Krylenko SV, Galkin SV, Gebruk AV, Malakhov VV Tags: Dokl Biol Sci Source Type: research

First Finding of Representatives of the Eccrinida Order in the Digestive Tract of King Crab Specie from the Barents Sea.
Abstract This is the first report on the finding of large intra-intestinal symbionts belonging to the order Eccrinida in crab-like decapod crustaceans of the family Lithodidae, Paralithodes camtschaticus and Lithodes maja, inhabiting the Barents Sea. Studies have been regularly conducted since the early 2000s in Kola Bay and in one of the inlets of the Eastern Murman Coast. Since 2005, Eccrinida representatives (presumably, a new species of the genus Arundinula) have been found in the guts of the red king crab. A brief description of the endosymbionts and data on their frequency of occurrence are presented. The po...
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Pavlova LV Tags: Dokl Biol Sci Source Type: research

A New Interpretation of the Crocodile Forelimb Morphological Features as Adaptation to Parasagittal Quadrupedal Locomotion on the Ground.
We describe the crocodile forelimb features that distinguish them from other reptiles. Reduction of the clavicle and a change in the coracoid shape seem to be another way of maintaining the efficient step length, while the antebrachium and manus transformations create peculiar oblique manus position on the ground to promote the forelimb parasagittalization. PMID: 30603946 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Pashchenko DI Tags: Dokl Biol Sci Source Type: research

Silver-Containing Humic Substance-Based Nanocomposites-Agents for Healing of Potatoes from the Ring Rot.
Abstract The influence of silver-containing humic substance (HS)-based nanocomposites (NCs) obtained from mud, shale, and coals of three kinds of deposits in Mongolia on the viability and ability to biofilm formation of a phytopathogenic gram-positive bacterium Clavibacter michiganensis subsp. sepedonicus (Cms), as well as peroxidase activity and potato plant growth in vitro, has been investigated. The maximum reduction of the viability of bacterial cells was found in the case of incubation with HS-mu/Ag NC and HS-coal/Ag NC. It was found that HSs, including HS-mu and HS-sl, and NCs synthesized on the base of thes...
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Graskova IA, Perfileva AI, Nozhkina OA, Sukhov BG, Aleksandrova GP, Trofimov BA Tags: Dokl Biol Sci Source Type: research

The Change in the Entomopathogenic Properties in Streptomycin Resistant Bacillus thuringiensis.
Abstract Streptomycin-resistant strains (StrR) of the entomopathogenic bacteria Bacillus thuringiensis ssp. galleriae (Btg) have been obtained. Assessment of growth rate of Btg 69-6 colonies revealed significant difference between the initial strain StrS sensitive to antibiotics and StrR. Decrease in susceptibility of instar IV larvae of Galleria mellonella to Btg 69-6 StrR by a factor of eight compared to Btg 69-6 StrS has also been recorded. In Btg 190 StrR, the insecticidal activity decreased by a factor of five. In StrR, the biochemical properties changed after acquisition of resistance compared to the initial...
Source: Doklady Biological Sciences - November 1, 2018 Category: Biology Authors: Polenogova OV, Glupov VV Tags: Dokl Biol Sci Source Type: research

Rearrangement of the Prefrontal Cortex Neural Activity in Both Hemispheres during Learning.
Abstract Neuronal activity of both right and left hemispheres of the rat prefrontal brain cortex was recorded in the two-ring maze during animal learning to operate in response to signals. At the beginning of learning, pairwise comparison of neural activity that accompanied correct and incorrect choice of the right and left sides showed significant differences in the left hemisphere and the lack of differences in the right one. With increasing percentage of correct choices during a session of learning, the differences in neuronal responses appeared in the right hemispheres and were reduced in the left one. The opp...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Orlov AA, Filatova EV, Afanasyev SV Tags: Dokl Biol Sci Source Type: research

Working Memory for Low-Level Visual Features: Sensory Mechanisms for Detecting the Mismatch between the Current Orientations and Those Stored in Memory.
Abstract The amplitudes of the P100 and N150 early components of evoked potentials in the visual cortex have been analyzed on 33 volunteers with normal vision during matching between the current orientation and that stored in memory. An increase in the P100 response in the occipital and parietal cortical areas was identified as an informative indicator of mismatch between the current and stored-in-memory orientations. This effect was not found for more complex stimuli, namely, spatial patterns. The N150 component demonstrated a similar effect, but in contrast to P100 it was not stimulus specific. Thus, in the firs...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Mikhailova ES, Gerasimenko NY, Prokudin PA Tags: Dokl Biol Sci Source Type: research

Evolutionary Changes in the Content of Dehydrogenase System Metabolites as a Mechanism of Adaptation to Cold in Higher Vertebrates.
Abstract It has been found that the optimal body balance control under the conditions of the adaptation to cold is mostly determined by the ratio of the blood concentrations of endogenous ethanol and acetaldehyde related to the activities of liver alcohol dehydrogenase and aldehyde dehydrogenase in the order of increasing level of adaptation: higher vertebrates unadapted to cold, including human → small animals adapted to cold → large animals adapted to cold native to the North → hibernators, regardless of the species specificity and the environment. PMID: 30402751 [PubMed - in process] (Source...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Kolosova ON, Kershengolts BM, Solomonov NG Tags: Dokl Biol Sci Source Type: research

Morphological Study of Myelinated Fibers of the Sciatic Nerve in Mice after Space Flight and Readaptation to the Conditions of Earth Gravity.
Abstract We revealed a decrease in the thickness of the myelin sheath and myelin delamination in the tibial nerve of C57BL/6N mice after a 30-day flight aboard the biosatellite Bion-M1. The processes of myelin degeneration continued for seven days after return of the animals to Earth and adaptation to the conditions of natural gravity. Our data add to hypothesis on the role of neurogenic component in pathogenesis of hypogravity motor syndrome. PMID: 30402752 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Rezvyakov PN, Shaimardanova GF, Lisukov AN, Kuznetsov MS, Islamov RR, Nikolskiy EE Tags: Dokl Biol Sci Source Type: research

Differences in the Postural Responses to Approaching and Receding Sound Images in Subjects with Different Perceptual Styles.
Abstract A hypothesis on the universal character of perceptual style for analyzing the surrounding space during sensory interactions has been tested. The indices of postural responses to moving and stationary auditory images in the groups of field-dependent and field-independent subjects, i.e., those who perceive spatial information about the object considering or ignoring the background, respectively, have been investigated. The differences in the sway parameters in both groups were revealed only in the case of moving auditory images. Body sway was more prominent in the group of field-independent subjects, wherea...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Andreeva IG, Gvozdeva AP, Bobrova EV, Gerasimenko YP Tags: Dokl Biol Sci Source Type: research

Morphological and Taxonomic Interpretation of Orestovia and Schuguria, Enigmatic Devonian Plants from Russia.
Abstract A detailed study of the external and internal surfaces of the cuticle of Orestovia and Schuguria using scanning electron microscopy and confocal laser microscopy has shown that the structures formerly interpreted as stomata or reproductive organs are most likely to be gland cells producing mucilage. Each structure represents a single large cell with a complex aperture on the external wall. In addition, a reproductive organ similar to multilocular sporangia known in brown algae of the order Ectocarpales has been found in attachment to a compression fossil of Orestovia. These data suggest similarity of the ...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Gomankov AV Tags: Dokl Biol Sci Source Type: research

Activity of the Enzymes of the Energy and Carbohydrate Metabolism in the Organs of the Three-Spined Stickleback Gasterosteus aculeatus from Different Biotopes of the White Sea.
Abstract The activity of the key enzymes of the energy and carbohydrate metabolism (cytochrome c oxidase, lactate dehydrogenase, aldolase, and glucose-6-phosphate dehydrogenase) have been studied in the three-spined stickleback Gasterosteus aculeatus spawning in different biotopes of the White Sea (Sel'dyanaya Bay, Sukhaya Salma Strait, and Kolyushkovaya Lagoon). It was found that individuals of stickleback from different spawning grounds differed mainly in the level of anaerobic metabolism and in the degree of utilization of carbohydrates during glycolysis. The results testify to the existence of adaptive mechani...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Churova MV, Shulgina NS, Nemova NN Tags: Dokl Biol Sci Source Type: research

Dynamics of Estradiol Level during Metamorphosis in the Daubed Shanny (Leptoclinus maculatus, Fries, 1838) from Spitsbergen Island.
Abstract The estradiol content of muscles during metamorphosis in the daubed shanny (Leptoclinus maculatus) from different fjords of Spitsbergen Island, Svalbard, have been studied using mass spectrometry. The level of estradiol at the L4 larval stage of development is significantly lower than at the L2 stage. Values of this parameter in adults are significantly higher than in post-larvae (stage L5). Variations in the estradiol level during metamorphosis can be associated with the growth stimulation and regulation of the process. PMID: 30402756 [PubMed - in process] (Source: Doklady Biological Sciences)
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Nemova NN, Rendakov NL, Pekkoeva SN, Nikerova KM, Murzina SA Tags: Dokl Biol Sci Source Type: research

A Mass Burial of Fossil Lions (Carnivora, Felidae, Panthera (Leo) ex gr. fossilis-spelaea) from Eurasia.
Abstract The vertebrate fauna from the cave deposits in Imanai Cave in the Southern Urals (53°02' N, 56°26'E) has been studied. It contains 715 bones that belonged to at least 11 individuals of fossil lion (Panthera (Leo) ex gr. fossilis-spelaea). It has been established that this is one of the largest Eurasian burial sites of fossil lions. The bones were accumulated due to the natural death of animals inside the cave. The age and sex estimations have shown that at least six adult males and five adult females died there. According to the accompanying fauna, radiocarbon, geochemical, and mineralogical analy...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Gimranov DO, Kotov VG, Rumyantsev MM, Silaev VI, Yakovlev AG, Yakovleva TI, Zelenkov NV, Sotnikova MV, Devyashin MM, Plasteeva NA, Zaretskaya NE, Nurmukhametov IM, Smirnov NG, Kosintsev PA Tags: Dokl Biol Sci Source Type: research

The Results of Sable (Martes zibellina) Reintroduction Demonstrate the Founder Effect.
Abstract The relative abundance of intrapopulation groups with different parameters of skull size, coat color, and expression of an epigenetic cranial trait was compared in autochthonous, reintroduced, and donor populations of sable. Recovery of the species resources and broad variability of the phenotypic trait complex in the newly fomned populations were observed. A large proportion of the animals had the phenotype that included large size, dark coat color, and pronounced expression of a specific phene trait (foramen in the condylar fossa) and was not characteristic of the neighboring autochthonous populations. ...
Source: Doklady Biological Sciences - September 1, 2018 Category: Biology Authors: Monakhov VG Tags: Dokl Biol Sci Source Type: research