全文获取类型
收费全文 | 5295篇 |
免费 | 317篇 |
国内免费 | 4篇 |
专业分类
林业 | 269篇 |
农学 | 244篇 |
基础科学 | 9篇 |
1002篇 | |
综合类 | 609篇 |
农作物 | 587篇 |
水产渔业 | 424篇 |
畜牧兽医 | 2067篇 |
园艺 | 74篇 |
植物保护 | 331篇 |
出版年
2023年 | 28篇 |
2022年 | 89篇 |
2021年 | 116篇 |
2020年 | 97篇 |
2019年 | 107篇 |
2018年 | 137篇 |
2017年 | 160篇 |
2016年 | 184篇 |
2015年 | 164篇 |
2014年 | 199篇 |
2013年 | 284篇 |
2012年 | 350篇 |
2011年 | 418篇 |
2010年 | 223篇 |
2009年 | 220篇 |
2008年 | 314篇 |
2007年 | 301篇 |
2006年 | 269篇 |
2005年 | 248篇 |
2004年 | 232篇 |
2003年 | 189篇 |
2002年 | 203篇 |
2001年 | 144篇 |
2000年 | 119篇 |
1999年 | 77篇 |
1998年 | 32篇 |
1997年 | 18篇 |
1996年 | 20篇 |
1995年 | 21篇 |
1993年 | 21篇 |
1992年 | 28篇 |
1991年 | 27篇 |
1990年 | 33篇 |
1989年 | 37篇 |
1988年 | 31篇 |
1987年 | 40篇 |
1986年 | 18篇 |
1985年 | 32篇 |
1984年 | 23篇 |
1983年 | 27篇 |
1981年 | 19篇 |
1980年 | 15篇 |
1978年 | 21篇 |
1977年 | 19篇 |
1976年 | 28篇 |
1975年 | 14篇 |
1974年 | 20篇 |
1973年 | 22篇 |
1972年 | 22篇 |
1971年 | 15篇 |
排序方式: 共有5616条查询结果,搜索用时 19 毫秒
401.
Accretion of primitive planetesimals: Hf-W isotopic evidence from enstatite chondrites 总被引:1,自引:0,他引:1
Enstatite chondrites have often been considered to be closely related to the material from which Earth accreted. However, tungsten isotopic data reveal clear differences. Moreover, the silicate and metal fractions define distinct initial (182)Hf/(180)Hf corresponding to a 13.8 +/- 5.3 million year apparent age difference. Internal reequilibration does not provide a ready explanation for this result. Larger scale redistribution of tungsten is more likely, such as may have occurred during collisions between planetesimals. 相似文献
402.
Spatial patterns in the distribution of tropical tree species 总被引:1,自引:0,他引:1
Condit R Ashton PS Baker P Bunyavejchewin S Gunatilleke S Gunatilleke N Hubbell SP Foster RB Itoh A LaFrankie JV Lee HS Losos E Manokaran N Sukumar R Yamakura T 《Science (New York, N.Y.)》2000,288(5470):1414-1418
Fully mapped tree census plots of large area, 25 to 52 hectares, have now been completed at six different sites in tropical forests, including dry deciduous to wet evergreen forest on two continents. One of the main goals of these plots has been to evaluate spatial patterns in tropical tree populations. Here the degree of aggregation in the distribution of 1768 tree species is examined based on the average density of conspecific trees in circular neighborhoods around each tree. When all individuals larger than 1 centimeter in stem diameter were included, nearly every species was more aggregated than a random distribution. Considering only larger trees (>/= 10 centimeters in diameter), the pattern persisted, with most species being more aggregated than random. Rare species were more aggregated than common species. All six forests were very similar in all the particulars of these results. 相似文献
403.
Weng AP Ferrando AA Lee W Morris JP Silverman LB Sanchez-Irizarry C Blacklow SC Look AT Aster JC 《Science (New York, N.Y.)》2004,306(5694):269-271
Very rare cases of human T cell acute lymphoblastic leukemia (T-ALL) harbor chromosomal translocations that involve NOTCH1, a gene encoding a transmembrane receptor that regulates normal T cell development. Here, we report that more than 50% of human T-ALLs, including tumors from all major molecular oncogenic subtypes, have activating mutations that involve the extracellular heterodimerization domain and/or the C-terminal PEST domain of NOTCH1. These findings greatly expand the role of activated NOTCH1 in the molecular pathogenesis of human T-ALL and provide a strong rationale for targeted therapies that interfere with NOTCH signaling. 相似文献
404.
Hwang WS Ryu YJ Park JH Park ES Lee EG Koo JM Jeon HY Lee BC Kang SK Kim SJ Ahn C Hwang JH Park KY Cibelli JB Moon SY 《Science (New York, N.Y.)》2004,303(5664):1669-1674
Somatic cell nuclear transfer (SCNT) technology has recently been used to generate animals with a common genetic composition. In this study, we report the derivation of a pluripotent embryonic stem (ES) cell line (SCNT-hES-1) from a cloned human blastocyst. The SCNT-hES-1 cells displayed typical ES cell morphology and cell surface markers and were capable of differentiating into embryoid bodies in vitro and of forming teratomas in vivo containing cell derivatives from all three embryonic germ layers in severe combined immunodeficient mice. After continuous proliferation for more than 70 passages, SCNT-hES-1 cells maintained normal karyotypes and were genetically identical to the somatic nuclear donor cells. Although we cannot completely exclude the possibility that the cells had a parthenogenetic origin, imprinting analyses support a SCNT origin of the derived human ES cells. 相似文献
405.
A liquid crystal system was used for the fabrication of a highly ordered composite material from genetically engineered M13 bacteriophage and zinc sulfide (ZnS) nanocrystals. The bacteriophage, which formed the basis of the self-ordering system, were selected to have a specific recognition moiety for ZnS crystal surfaces. The bacteriophage were coupled with ZnS solution precursors and spontaneously evolved a self-supporting hybrid film material that was ordered at the nanoscale and at the micrometer scale into approximately 72-micrometer domains, which were continuous over a centimeter length scale. In addition, suspensions were prepared in which the lyotropic liquid crystalline phase behavior of the hybrid material was controlled by solvent concentration and by the use of a magnetic field. 相似文献
406.
407.
408.
409.
Lee FS 《Science (New York, N.Y.)》1909,29(744):521-527
410.
Lee TG 《Science (New York, N.Y.)》1908,27(703):940-954