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排序方式: 共有254条查询结果,搜索用时 218 毫秒
1.
Abstract The parasitoid wasp Trichogramma dendrolimi Matsumura sets the number of progeny allocated to its insect egg hosts according to the duration of its initial transit walk across the host surface. Although cooling the wasp reduces its walking speed, reduced temperature does not affect progeny allocation. By locally heating and cooling the wasps, the initial transit can be thermally uncoupled from the subsequent oviposition. Using this technique we show that the timing of initial transit duration is temperature-dependent. These findings suggest that short interval timing by Trichogramma differs physiologically from the temperature compensated clocks that have been described for other insects. 相似文献
2.
Sensitivity to and requirement for iron in Plantago species 总被引:1,自引:0,他引:1
3.
FRAUKE M. MUENZEL MATTHIAS SANETRA WALTER SALZBURGER AXEL MEYER 《Molecular ecology resources》2007,7(6):1048-1050
Eleven microsatellites were isolated from the vairone Leuciscus souffia (Risso 1826), an endangered fish that inhabits river systems in and around the Alps in Europe. The level of genetic diversity was assessed in 29 individuals of the subspecies L. s. souffia, and their variability was further estimated in seven individuals of a different subspecies, L. s. muticellus. Eight of these microsatellite loci were also applied to seven closely related cyprinid species. Availability of the reported microsatellite loci will facilitate the investigation of population genetic structure of these species with applications for the development of conservation strategies and phylogeographical approaches. 相似文献
4.
HELMUT J. SCHMIDT 《The Journal of eukaryotic microbiology》1982,29(1):132-135
A new method is described for mass cultivation of Euplotes aediculatus, a hypotrich ciliate containing omikron-symbionts. The ciliate cultures, continuously aerated in Erlenmeyer flasks (5000 ml) with 4500 ml medium, yield densities of 2300 cells/ml which are four to five times higher than cell densities of cultures grown in unaerated Fernbach flasks. Harvesting such cultures involves the application of 25-μm mesh sieves. Cells so concentrated can be purified by using columns or special chambers in which Euplotes migrates towards the cathodes in an electric field (field strength 7 V/cm). 相似文献
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7.
When seedlings of lettuce and turnip were grown in nutrientsolutions containing different concentrations of linuron, theconcentration in the shoot at the time when toxicity symptomsappeared was related to the solution concentration. With lettuce,for example, symptoms were recorded after 7 d at 0.15 µg/mland the shoot concentration was 2.7 µg/g fresh wt. At0.06 µg/ml, symptoms appeared after 10 d and the shootconcentration was then 1.1 µg/g fresh wt. If grown fordifferent periods in solutions containing linuron and then transferredto fresh nutrient solutions containing no herbicide, turnipor lettuce seedlings which had accumulated 0.70.8 µglinuron/g fresh wt developed toxicity symptoms 4 to 6 d later.Seedlings were also treated with linuron after they had grownfor different periods in control nutrient solutions. The shootconcentrations attained before toxicity symptoms appeared werehigher in those seedlings which were larger when herbicide treatmentbegan. These results show that the herbicide concentration insolution, time of exposure, and age of seedling are interrelatedin determining linuron phytotoxicity. 相似文献
8.
EBBE SCHMIDT NIELSEN 《Systematic Entomology》1982,7(2):217-238
. The Holarctic genus Paraclemensia Busck, 1904, is revised and eight species are recognized: cyanella (Zeller) [= europaea Davis] (Europe), caemlea (Issiki) comb.n. (Japan), viridis sp.n. (Japan), oligospina sp.n. (Japan), cyanea sp.n. (Japan), acerifoliella (Fitch) [= hiteiceps (Walker); = iridella (Chambers)] (U.S.A. and Canada), incerta (Christoph) comb.n. (Siberia and Japan) and monospina sp.n. (Japan). The monophyly of the genus is demonstrated and the phylogeny and biogeography of the species are discussed. P. acerifoliella from North America is regarded as most closely related to two of the eastern Palaearctic species, incerta and monospina. A key to species is provided, and adults and male and female genitalia are described and illustrated (or references are given to illustrations published elsewhere). Three lectotypes are designated. The genus-group name ‡ Tschabia Issiki is demonstrated to be nomenclaturally unavailable. 相似文献
9.
Waterlogging and fire impacts on nitrogen availability and utilization in a subtropical wet heathland (wallum) 总被引:8,自引:1,他引:7
Protein, amino acids and ammonium were the main forms of soluble soil nitrogen in the soil solution of a subtropical heathland (wallum). After fire, soil ammonium and nitrate increased 90- and 60-fold, respectively. Despite this increase in nitrate availability after fire, wallum species exhibited uniformly low nitrate reductase activities and low leaf and xylem nitrate. During waterlogging soil amino acids increased, particularly γ-aminobutyric acid (GABA) which accounted for over 50% of amino nitrogen. Non-mycorrhizal wallum species were significantly (P < 0.05) 15N-enriched (0.3–4.3‰) compared to species with mycorrhizal associations (ericoid-type, ecto-, va-mycorrhizal) which were strongly depleted in 15N (-6.3 to -1.8‰). Lignotubers and roots had δ15N signatures similar to that of the leaves of respective species. The exceptions were fine roots of ecto-, ecto/va-, and ericoid type mycorrhizal species which were enriched in 15N (0.1–2.4‰). The 515N signatures of δ15Ntotal soil N and δ15Nsoil NH4+ were in the range 3.7–4.5‰, whereas δ15Nsoil NO3? was significantly (P < 0.05) more enriched in 15N (9.2–9.8‰). It is proposed that there is discrimination against 15N during transfer of nitrogen from fungal to plant partner. Roots of selected species incorporated nitrogen sources in the order of preference: ammonium > glycine > nitrate. The exception were proteoid roots of Hakea (Proteaceae) which incorporated equal amounts of glycine and ammonium. 相似文献
10.
K. SCHMIDT M. R. L. JOHNSTON W. E. STEHBENS 《The Journal of eukaryotic microbiology》1967,14(4):602-608
SYNOPSIS. A study was made of the fine structure of some stages in the life cycle of an undesignated species of Isospora parasitic in a gecko. The merozoites which lay within a membrane-bound periparasitic vacuole in the host epithelial cell, had a striking similarity to Plasmodium, Lankesterella, Toxoplasma, Besnoitia, Sarcocystis, Eimeria and the M-organism. Each merozoite was invested with a triple-layered pellicle, the outer membrane of which was loosely applied. At the anterior end of the merozoite were conoid and apical rings; microtubules terminated in the posterior apical ring. Other organelles included nucleus, endoplasmic reticulum, mitochondria, micropyle, paired organelle, toxonemes and a variety of vacuoles. Although the sequence of development of the merozoite was not completely followed, some events in this process were recorded. The evidence suggests that anterior ends are formed early and that merozoites develop subsequently by a process of budding. The merozoite pellicle appears to be continuous with, altho structurally different from, the investing membrane of the parent cell. 相似文献