全文获取类型
收费全文 | 67篇 |
免费 | 0篇 |
出版年
2015年 | 1篇 |
2013年 | 1篇 |
2012年 | 5篇 |
2011年 | 3篇 |
2009年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1999年 | 1篇 |
1993年 | 1篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 6篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1968年 | 2篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1961年 | 6篇 |
1960年 | 1篇 |
1958年 | 3篇 |
1957年 | 1篇 |
排序方式: 共有67条查询结果,搜索用时 15 毫秒
21.
A method of cultivation and effectiveness of different light sources and light regimes in photoperiodic induction of flowering
in non-rosette long-day plantChenopodium murale L. ecotype 197 are described. Under the described conditions of cultivation 5 days, of continuous light produced by incandescent
bulbs (TESLA 74 3x40 W, red 4.9 μWcm-2nn-1, far-red 7.4 μWcn-2nm-1, blue 0.25 μW cm-2nn-1) induced flowering in the majority of plants. 相似文献
22.
The study deals with the effect of indol-3-ylacetic acid (IAA) on endogenous rhythm of flowering inChenopodium rubrum L. ecotype 374. Phase setting of the rhythm and length of its period were not affected, its amplitude decreased or changed
insignificantly depending on the time and the site of IAA application. The intervals of significant inhibitory effect of IAA
applied to apical buds terminated later than after IAA application to photoreceptive organs. The inhibitory effect did not
correlate with the level of IAA uptake. Results obtained support the hypothesis that both photoreceptive organs and apical
buds are the sites of inhibitory effect of applied IAA. 相似文献
23.
Pea plants grown in nutrient solution in which K+ ions were equimolarly replaced with Na+, NH4 + or Rb+ did not show morphological symptoms of potassium-deficiency. The activity of diamine oxidase in these plants was higher than in controls. Similarly higher diamine oxidase activity was found in plants grown in a complete nutrient solution supplemented with putrescine. 相似文献
24.
Иэ распределения активности в отдельных отщеплениях эритромицина после прибавления уксусной кислоты, меченой 1-С14 и 2-С14, вытекает, что уксусная кислота не является прямым предшественником дезозамина и кладинозы. Распределение активности в пропион-альдегиде, изолированном из эритронолида, показывает, что уксусная кислота перед своим включением в эритромицин проходит цикл, подобный пиклу дикарбоновых или трикарбоновых кислот. 相似文献
25.
26.
The first acceleration of protein degradation in cells ofBacillus megaterium was found at the stage 0–I of sporulation, the second one at the stage II–III, where the sporulation process became irreversible. These accelerations were reduced by actinomycin D inhibiting RNA and protein syntheses by more than 95%. In the presence of the antibiotic, only 8% of prelabeled proteins were degraded. Actinomycin D did not lower either the concentration of ATP or the proteolytic activity in the homogenate prepared from sporulating cells. This indicates that the inhibition of protein catabolism by actinomycin D was not owing to the absence of ATP or proteolytic enzymes. Actinomycin probably inhibited an unknown step preceding the proteolytic attack of the protein molecules during sporulation, because it had no significant effect on proteolysis during vegetative growth. 相似文献
27.
28.
29.
Libuše Kolářová Karl Skírnisson Hubert Ferté Damien Jouet 《Parasitology international》2013,62(3):300-308
Parasitological investigations on red-breasted mergansers (Mergus serrator L.) in Iceland revealed digenean flukes of the family Schistosomatidae. Adult worms were detected in blood vessels of the large intestine and eggs were deposited in the mucosa and surrounded by granulomatous reactions. Traditional morphological methods showed that the flukes have very slender filiform bodies, males are equipped with a short gynaecophoric canal and both suckers and spatulate ends are present on each sex. Among characteristics of the flukes which render them morphologically distinct from other Trichobilharzia species are: i) males—well developed vesicula seminalis (v.s.) consisting of a short v.s. externa and a significantly longer (approx. 3 times) v.s. interna, unusually well developed genital papilla and localization of the first testis a relatively long distance posterior to the gynaecophoric canal; ii) eggs—small and elongated with slightly rounded poles and a short terminal spine. DNA taxonomic techniques confirmed that a new species had been identified, Trichobilharzia mergi sp. n. The sequence data were deposited in GenBank under the accession numbers JX456151 to JX456172. Comparison of the results with our previously published data on characterization of DNA of cercariae isolated from freshwater lymnaeid snails showed that larval development of T. mergi is associated with Radix balthica L. (=Radix peregra Müller, 1774; = Radix ovata Draparnaud, 1805). 相似文献