全文获取类型
收费全文 | 1710篇 |
免费 | 209篇 |
国内免费 | 2篇 |
出版年
2021年 | 25篇 |
2020年 | 14篇 |
2019年 | 19篇 |
2018年 | 25篇 |
2017年 | 13篇 |
2016年 | 29篇 |
2015年 | 56篇 |
2014年 | 66篇 |
2013年 | 87篇 |
2012年 | 99篇 |
2011年 | 115篇 |
2010年 | 64篇 |
2009年 | 54篇 |
2008年 | 70篇 |
2007年 | 72篇 |
2006年 | 64篇 |
2005年 | 69篇 |
2004年 | 68篇 |
2003年 | 60篇 |
2002年 | 69篇 |
2001年 | 19篇 |
2000年 | 19篇 |
1999年 | 21篇 |
1998年 | 29篇 |
1997年 | 20篇 |
1994年 | 17篇 |
1992年 | 17篇 |
1991年 | 25篇 |
1990年 | 17篇 |
1989年 | 23篇 |
1988年 | 25篇 |
1987年 | 19篇 |
1986年 | 15篇 |
1985年 | 13篇 |
1984年 | 14篇 |
1983年 | 18篇 |
1982年 | 18篇 |
1981年 | 26篇 |
1980年 | 18篇 |
1977年 | 14篇 |
1976年 | 18篇 |
1974年 | 14篇 |
1973年 | 19篇 |
1971年 | 14篇 |
1970年 | 13篇 |
1969年 | 16篇 |
1968年 | 18篇 |
1967年 | 12篇 |
1964年 | 16篇 |
1963年 | 15篇 |
排序方式: 共有1921条查询结果,搜索用时 0 毫秒
1.
2.
Justin C. Luong Patrick L. Turner Celina N. Phillipson Katja C. Seltmann 《Ecological Entomology》2019,44(4):471-479
1. It is hypothesised that ecological restoration in grasslands can induce an alternative stable state shift in vegetation. The change in vegetation influences insect community assemblages and allows for greater functional redundancy in pollination and refuge for native insect species. 2. Insect community assemblages at eight coastal California grassland sites were evaluated. Half of these sites had undergone restoration through active revegetation of native grassland flora and half were non‐restored. Insects were collected from Lupinus bicolor (Fabaceae) within 2 × 2‐m2 plots in spring 2017. Lupinus bicolor is a common native species that is used in California restoration projects, and home and state landscaping projects. 3. Ordination demonstrated that insect community assemblages were different between restored and non‐restored sites. These differences were seen in insect functional groups as well as taxa‐specific differences and were found to be driven by environmental characteristics such as non‐native forb cover. 4. Functional redundancy of herbivores decreased at restored sites, while pollinators became more redundant compared with non‐restored sites. The assemblages of the common species found at restoration sites contained more native insects than those found at non‐restored sites, including species such as Bombus vosnesenskii. 5. Local grassland restoration has the potential to induce an alternative stable state change and affect insect community assemblages. Additionally, it was found that grassland restoration can be a potential conservation tool to provide refugia for bumblebees (Bombus), but additional studies are required to fully understand its broader applicability. 相似文献
3.
Elisabetta Visalberghi Virginia Barca Patricia Izar Dorothy Fragaszy Valentina Truppa 《American journal of primatology》2021,83(1)
Tool use in humans can be optional, that is, the same person can use different tools or no tool to achieve a given goal. Strategies to reach the same goal may differ across individuals and cultures and at the intra‐individual level. This is the first experimental study at the intra‐individual level on the optional use of a tool in wild nonhuman primates. We investigated optional tool use by wild bearded capuchins (Sapajus libidinosus) of Fazenda Boa Vista (FBV; Piauí, Brazil). These monkeys habitually succeed in cracking open the mesocarp of dry cashew nuts (Anacardium spp.) by pounding them with stones and/or by biting. We assessed whether availability of a stone and resistance of the nut affected capuchins' choice to pound or to bite the nuts and their rates of success. Sixteen capuchins (1–16 years) received small and large dry cashew nuts by an anvil together with a stone (Stone condition) or without a stone (No‐Stone condition). In the Stone conditions, subjects used it to crack the nut in 89.1% (large nuts) and 90.1% (small nut) of the trials. Nut size significantly affected the number of strikes used to open it. Availability of the stone significantly increased the average percent of success. In the No‐Stone conditions, monkeys searched for and used other percussors to crack the nuts in 54% of trials. In all conditions, age affects percentage of success and number of strikes to reach success. We argue that exclusive use of stones in other sites may be due to the higher abundance of stones at these sites compared with FBV. Since capuchins opened cashews with a tool 1–2 years earlier than they succeed at cracking more resistant palm nuts, we suggest that success at opening cashew nuts with percussors may support the monkeys' persistent efforts to crack palm nuts. 相似文献
4.
5.
Dorothy Trainor 《CMAJ》1982,126(10):1235-1237
6.
The 13C NMR spectra of geosmin, selina-4(14),7(11)-diene-99-ol and two dihydroeudesmol isomers have been obtained and the individual resonances assigned. Several different empirical correlations developed by others have been combined in simple calculations to predict chemical shift values for sesquiterpenols of the eudesmane group. 相似文献
7.
8.
Nigel J. Fuller Dorothy M. Stirling Stephen Dunnett Gavin P. Reynolds Margaret Ashwell 《Bioscience reports》1987,7(2):121-127
The effects of reducing brain serotonin (5-HT) levels by means of intracerebral-ventricular injections of the tryptophan antagonist p-chlorophenylalanine (PCPA) were investigated in male rats. Six days after the operation, PCPA-treated rats, either fedad libitum or pair-fed to the food intake of control rats, showed decreased thermogenic activity and capacity in their interscapular brown adipose tissue (BAT) and also increased fat storage in their white adipose tissue (WAT). These results indicate that serotonergic synapses might play a regulatory role in the sympathetic control of BAT thermogenesis and in the rate of WAT deposition (by an as yet unidentified mechanism), in addition to their well established role in controlling food intake. 相似文献
9.
Generalization of monod kinetics for analysis of growth data with substrate inhibition 总被引:6,自引:0,他引:6
Luong JH 《Biotechnology and bioengineering》1987,29(2):242-248
The inhibitory effect of butanol on yeast growth has been studied for the strain Candida utilis ATCC 8205 growing aerobically on butanol under batch conditions. A mathematical expression was then proposed to fit the kinetic pattern of butanol inhibition on the specific growth rate: \documentclass{article}\pagestyle{empty}\begin{document}$$ \mu = \frac{{\mu _m S}}{{K_s + S}}\left[{1 - \frac{S}{{S_m }}} \right];n $$\end{document}The maximum allowable butanol concentration above which cells do not grow was predicted to be 9.16g/L. The proposed model appears to accurately represent the experimental data obtained in this study and the literature data developed for a variety of batch culture systems at widely ranging substrate concentrations. 相似文献
10.
p82H identifies sequences at every human centromere 总被引:7,自引:3,他引:4
Carmen Aleixandre Dorothy A. Miller Arthur R. Mitchell Dorothy A. Warburton Steven L. Gersen Christine Disteche Orlando J. Miller 《Human genetics》1987,77(1):46-50
Summary A cloned alphoid sequence, p82H, hybridizes in situ to the centromere of every human chromosome. After washing under stringent conditions, no more than 8% of the grains are located on any specific chromosome. p82H thus differs from other centromeric sequences which are reported to be chromosome specific, because it detects sequences that are conserved among the chromosomes. Two experimental approaches show that the p82H sequences are closely associated with the centromere. First, p82H remains with the relocated centromeres in an inv(19) and an inv(6) chromosome. Second, p82H hybridizes at the centromere but not to the centromeric heterochromatin of chromosomes 1, 9 and 16 that have elongated 1qh, 9qh and 16qh regions produced by short growth in 5-azacytidine. The only noncentromeric site of hybridization is at the distal end of the 9qh region. 相似文献