全文获取类型
收费全文 | 64篇 |
免费 | 0篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 2篇 |
2012年 | 1篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2004年 | 3篇 |
2001年 | 6篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1969年 | 3篇 |
1968年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有64条查询结果,搜索用时 15 毫秒
31.
32.
N. I. Gerasimenko N. G. Busarova O. P. Moiseenko 《Russian Journal of Plant Physiology》2010,57(1):62-68
The contents of lipids and pigments were compared in juvenile and adult algae Costaria costata [Turn.] Saund (Laminariaceae) collected in April. The total content of lipids and that of particular lipid classes increased
markedly with age. In adult algae, the contents of total lipids, glyceroglycolipids, and neutral lipids doubled as compared
with juvenile algae and was equal to 5.70, 1.78, and 0.81 mg/g fr wt, respectively. The content of free sterols increased
with age by three times; it was equal to 0.11 mg/g fr wt in juvenile algae and 0.38 mg/g fr wt in adult algae. Total content
of phospholipids changed with age to a lesser extent: 0.72 mg/g fr wt in juvenile vs. 0.92 mg/g fr wt in adult algae. Substantial
changes were observed in the content of particular polar lipids. The absolute amounts of monogalactosyldiacylglycerols, sulfoquinovosyldiacylglycerols,
digalactosyldiacylglycerols, phosphatidylcholines, phosphatidylglycerols, and phosphatidylinosites increased markedly with
age, whereas the amount of phosphatidyl-O[N-(2-hydroxyethyl)glycines] declined. The amount of phosphatidylethanolamines did not depend on algal age. A small amount of
diphosphatidylglycerols was detected only in juvenile algae. The content of photosynthetic pigments (carotenoids and chlorophylls)
approximately doubled with age and, in adult algae, was equal to 0.57 and 1.23 mg/g fr wt, respectively. Total lipids of juvenile
and adult algae did not differ in fatty acid composition. At all developmental stages, polyunsaturated fatty acids predominated
early in spring and comprised about 80% of fatty acids. The acids of ω-3-series predominated among them. 相似文献
33.
V. V. Chechkin L. I. Grigor’eva R. O. Pavlichenko A. Ye. Kulaga N. V. Zamanov V. E. Moiseenko P. Ya. Burchenko A. V. Lozin S. A. Tsybenko I. K. Tarasov I. M. Pankratov D. L. Grekov A. A. Beletskii A. A. Kasilov V. S. Voitsenya V. K. Pashnev V. G. Konovalov A. N. Shapoval Yu. K. Mironov V. S. Romanov 《Plasma Physics Reports》2014,40(8):601-610
In the ? = 3 Uragan-3M torsatron, hydrogen plasma is produced and heated by RF fields in the Alfvén range of frequencies (ω ? ω ci ). To this end, a frame antenna with a broad spectrum of generated parallel wavenumbers is used. The RF discharge evolution is studied experimentally at different values of the RF power fed to the antenna (the anode voltage of the oscillator and the antenna current) and the initial pressure of the fueling gas. It is shown that, depending on the antenna current and hydrogen pressure, the discharge can operate in two regimes differing in the plasma density, temperature, and particle loss. The change in the discharge regime with increasing anode voltage is steplike in character. The particular values of the anode voltage and pressure at which the change occurs are affected by RF preionization or breakdown stabilization by a microwave discharge. The obtained results will be used in future experiments to choose the optimal regimes of the frame-antenna-produced RF discharge as a target for the production and heating of a denser plasma by another, shorter wavelength three-half-turn antenna. 相似文献
34.
Radiation-induced damage in nucleosomal DNA was modelled by Monte Carlo means. An atomistic representation of DNA with a first
hydration shell was used. DNA single- and double-strand break (SSB and DSB) yields were calculated for 137Cs photons, x-rays and tritium beta-particles. Monte Carlo-generated electron tracks for liquid water were used to model energy
deposition. Chemical evolution of a track and interactions between species and DNA following water radiolysis were modelled
in an encounter-controlled manner. The effects of varying the scavenging capacity of the environment, the extent of DNA protection
by histones and the setting of a threshold for direct energy depositions on DNA break yields were all systematically studied.
DSB complexity was assessed in terms of DNA breaks and base damage accompanying a DSB. Model parameters were adjusted to make
predictions consistent with experimental data on DSB yields and yield modification by a variety of factors including changing
DNA conformation and incorporation of scavengers. An embedded model of nucleosomal DNA by histones was required to explain
experimentally observed modification of DSB yield by removal of bound histones. Complex DSB, defined as DSB accompanied by
an additional strand breakage, exhibited high association with base damage. It is shown that hydroxyl radical interactions
with bases are a major contributor to DSB complexity. On average there were 1.15 and 2.69 OH-base interactions accompanying
simple and complex DSB, respectively for 137Cs. Over 80% of complex DSB had at least one OH-base interaction associated with a DNA break.
Received: 21 March 2000 / Accepted: 27 October 2000 相似文献
35.
VV. R. PHILIPSON F.L.S. 《Botanical journal of the Linnean Society. Linnean Society of London》1987,95(1):19-25
Problems presented by genera, or small groups of genera, which have been given family rank are reviewed, and the genera are divided into a number of categories according to the closeness of their affinity to other genera or families. Satellite genera that stand in close relation to families should be united with them. Binary families, that have been divided into two (or more) related families, should be re–united. Families connected by linking genera, should, logically, be united but practical considerations usually prevent this. Clusters of diverse but more or less distantly related genera present unusual problems, being treated either as several, often monogeneric families or as a loosely structured family. Truly isolated genera must be given family and often ordinal rank. 相似文献
36.
V N Gorbunova O P Romanenko V G Vakharlovski? T V Pigina E P Kalashnikova M M Moiseenko I Ia El'gart V S Baranov 《Genetika》1989,25(9):1664-1672
The activity of microvillar enzymes--gamma-glutamyltranspeptidase, aminopeptidase, general and intestinal forms of alkalyne phosphotases was studied in amniotic fluid (AF) of 33 women with 25% risk of cystic fibrosis (CF) (mucoviscidoses) in their progeny. The figures obtained in this group were compared with corresponding values of the same enzymes in 100 AF samples from normal pregnancies (negative control) and with 9 AF samples from women which were known to give birth to the children with CF (positive control). CF has been predicted in 5 cases, pregnancies were artificially terminated in 4 women. Biochemical CF prediction was proved by immunochemical assay of albumin contents in meconium of fetal ileum. One woman from the high risk group refused abortion and gave birth to a CF child. Among 26 cases of low CF prediction, 13 resulted in birth of a child without a sign of CF, one - in a child with clear-cut diagnosis of CF and 12 other pregnancies still proceed. The efficiency of complex biochemical, pathomorphological and molecular approaches for verification of intrauterine CF diagnosis in aborted fetuses as well as for detection of heterozygous carriers of CF gene and prenatal diagnosis of CF is discussed. 相似文献
37.
Cytogenetic analysis was performed repeatedly on a breast cancer patient since the beginning of the antitumor treatment. Double minute chromosomes (DMS, 2-10 per cell) were found in less than 2% of peripheral blood lymphocytes besides other chromosomal abnormalities after radiation therapy and 8 months after chemotherapy. The level of structural chromosomal aberrations two years after the therapeutic treatment was 0.13-0.14 aberrations per cell, but DMS were not observed. Estimation of the fragile site (FS) frequency and distribution at this time revealed a significant expression of the common FS FRAGF (9q1.2) after the treatment of blood culture with 5-bromo-2-deoxyuridine at dose levels of 7 and 50 g/l and enhanced fragility in chromosome band 1p35-36.1 (FRA1A) in folate-deprived conditions. Rare FS were not found. The presented data are discussed. 相似文献
38.
39.
S.?V.?MuravevaEmail author M.?V.?Pronina G.?A.?Moiseenko A.?N.?Pnevskaya Yu.?I.?Polyakov Yu.?D.?Kropotov S.?V.?Pronin E.?Yu.?Shelepin Yu.?E.?Shelepin 《Human physiology》2017,43(6):625-636
The paper describes the results of studies aimed at evaluating the effect of interactive virtual environments on the visual system, including the magno-and parvo-systems. Analysis was conducted in patients diagnosed with paranoid schizophrenia diagnosed from one to five years ago. Comparative analysis of visual evoked potentials during the perception of images that differed in their semantic (animate/inanimate) and physical characteristics (filtration images at high/low spatial frequencies) was used for the assessment of the impact of virtual environments. The images of objects were filtered via digital filtration for selective effect on the magno-and parvo-channels of the visual system. To evaluate the function of visual perception, the measurement of contrast sensitivity using Gabor elements was used. At the early stages of schizophrenia, the patients exhibited a decrease in the amplitudes of the components of cognitive visual evoked potentials to stimuli filtered at high spatial frequencies and reduced contrast sensitivity at high spatial frequencies. The effect of virtual environments on the visual system resulted in a significant increase in the amplitude of the cognitive components of visual evoked potentials in the paradigm of presentation of images filtered at the high spatial frequencies, which allows the conclusion about a stimulating effect of the virtual environment on the parvo-system functioning. The activation of the magno-system occurred to a lesser extent. The present study represents the findings obtained by the studies of cognitive impairments in schizophrenia and the methods of their correction conducted at the Laboratory of Physiology of Vision of the Pavlov Institute of Physiology of the Russian Academy of Sciences and at the Laboratory of Neurobiology of Action Programming of the Bechtereva Institute of the Human Brain of the Russian Academy of Sciences. 相似文献
40.
G. M. Obaturov A. S. Filimonov V. V. Moiseenko 《Radiation and environmental biophysics》1993,32(4):295-310
A general equation for mammalian cell survival has been derived in the previous paper. This paper presents the results of comparison of theoretical evaluations with survival data available from the literature, including different cell lines, variations in linear energy transfer, dose rate and dose fractionation effects and the effects of ultrasoft X-rays and superheavy ions. Merits and demerits of the model are considered in comparison with other models of radiation-induced killing of mammalian cells published in the literature. 相似文献