全文获取类型
收费全文 | 122篇 |
免费 | 2篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 1篇 |
2012年 | 6篇 |
2011年 | 5篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2008年 | 5篇 |
2007年 | 5篇 |
2006年 | 8篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1975年 | 2篇 |
1974年 | 5篇 |
1973年 | 3篇 |
1972年 | 3篇 |
1971年 | 2篇 |
1970年 | 5篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有124条查询结果,搜索用时 15 毫秒
71.
The Tradescantia-stamen hair (Trad-SHM) and -micronucleus (Trad-MCN) bioassays were used to determine the genotoxicity of two eluates derived from mine tailings. The goal was to test the suitability of the Tradescantia bioassays as screening tools for this kind of waste material. Leachates obtained using the current standard German leaching test methods (S4 eluate) as well as leachates obtained using a new eluation method (pHstat4) were tested and compared. Concentration of heavy metals in the pHstat4 eluate were much higher than in the S4 eluate. The chemical analysis corresponded well with the results of the bioassays. Exposure to solutions containing more than 1% pHstat4 eluate caused a significantly higher number of micronuclei. The Trad-SHM bioassay also showed an increased pink mutation rate when plants were exposed to 8 or 16% eluate solutions. In contrast, the S4 eluate only caused increased mutation rates when solutions containing more than 32% eluate were used. The low pH of the pHstat4 eluate was not responsible for the genotoxicity observed using both bioassays, as indicated by the lack of significant mutation rates in the nitric acid controls. This demonstrates that the Tradescantia bioassays can be used as tools to assess the genotoxic potential of environmental samples with a wide range of pH values, without the need for sample modification. 相似文献
72.
Fomin V. V. Shavnin S. A. Marina N. V. Novoselova G. N. 《Russian Journal of Plant Physiology》2001,48(5):657-661
The pigment composition and light-response curves of the indices of prompt chlorophyll fluorescence were investigated in needles sampled from various parts of the tree crown in pine trees growing under natural conditions at various distances from a source of industrial air pollution (a copper-melting works). Shading and pollution decreased the threshold light level of the state corresponding to the second phase of the light-response curve of nonphotochemical chlorophyll fluorescence quenching, increased a nonradiating dissipation of the absorbed light energy, and decreased the rate of electron transfer between PSII and PSI. The patterns thus established demonstrate the existence of nonspecific chloroplast responses to pollution and shading similar in their mechanism, which decrease the efficiency of light energy utilization. 相似文献
73.
Richard W. Zealy Mikhail Fomin Sylvia Davila Daniel Makowsky Haley Thigpen Catherine H. McDowell James C. Cummings Edward S. Lee Sang-Ho Kwon Kyung-Won Min Je-Hyun Yoon 《Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms》2018,1861(3):224-234
Eukaryotic mRNA metabolism regulates its stability, localization, and translation using complementarity with counter-part RNAs. To modulate their stability, small and long noncoding RNAs can establish complementarity with their target mRNAs. Although complementarity of small interfering RNAs and microRNAs with target mRNAs has been studied thoroughly, partial complementarity of long noncoding RNAs (lncRNAs) with their target mRNAs has not been investigated clearly. To address that research gap, our lab investigated whether the sequence complementarity of two lncRNAs, lincRNA-p21 and OIP5-AS1, influenced the quantity of target RNA expression. We predicted a positive correlation between lncRNA complementarity and target mRNA quantity. We confirmed this prediction using RNA affinity pull down, microarray, and RNA-sequencing analysis. In addition, we utilized the information from this analysis to compare the quantity of target mRNAs when two lncRNAs, lincRNA-p21 and OIP5-AS1, are depleted by siRNAs. We observed that human and mouse lincRNA-p21 regulated target mRNA abundance in complementarity-dependent and independent manners. In contrast, affinity pull down of OIP5-AS1 revealed that changes in OIP5-AS1 expression influenced the amount of some OIP5-AS1 target mRNAs and miRNAs, as we predicted from our sequence complementarity assay. Altogether, the current study demonstrates that partial complementarity of lncRNAs and mRNAs (even miRNAs) assist in determining target RNA expression and quantity. 相似文献
74.
75.
G K Stepankovskaia O P Shinlova V P Fomin S A Kosterin N E Iarotski? 《Ukrainski? biokhimicheski? zhurnal》1989,61(5):109-112
Oxytocin and sigetin were studied for their effect on the active and passive transport of Ca2+ in the fraction of myometrium sarcolemma in women. Oxytocin (5.10(-7) M) introduced into the sarcolemma vesicles and sigetin (5.10(-3) M) added into the incubation medium inhibit Mg2+, ATP-dependent accumulation of Ca2+ in these structures. The both agents in the mentioned concentration do not affect the passive release of cation from vesicles. A conclusion is drawn that inhibition of the calcium pump of myometrium cell plasma membranes underlies the physiological action of oxytocin and sigetin as stimulators of the contractile activity of the myometrium. 相似文献
76.
77.
78.
79.
80.
Opportunistic sightings of the endangered North Pacific right whales (Eubalaena japonica) in Russian waters in 2003–2014
下载免费PDF全文
![点击此处可从《Marine Mammal Science》网站下载免费的PDF全文](/ch/ext_images/free.gif)