全文获取类型
收费全文 | 277篇 |
免费 | 0篇 |
专业分类
系统科学 | 1篇 |
教育与普及 | 3篇 |
理论与方法论 | 1篇 |
现状及发展 | 51篇 |
研究方法 | 33篇 |
综合类 | 155篇 |
自然研究 | 33篇 |
出版年
2021年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2013年 | 1篇 |
2012年 | 8篇 |
2011年 | 41篇 |
2010年 | 3篇 |
2008年 | 11篇 |
2007年 | 14篇 |
2006年 | 12篇 |
2005年 | 11篇 |
2004年 | 15篇 |
2003年 | 10篇 |
2002年 | 13篇 |
2001年 | 5篇 |
2000年 | 11篇 |
1999年 | 7篇 |
1998年 | 1篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1988年 | 6篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1975年 | 1篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1972年 | 7篇 |
1971年 | 6篇 |
1970年 | 7篇 |
1969年 | 1篇 |
1968年 | 5篇 |
1967年 | 7篇 |
1966年 | 7篇 |
1965年 | 2篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有277条查询结果,搜索用时 8 毫秒
221.
Meimaridou E Kowalczyk J Guasti L Hughes CR Wagner F Frommolt P Nürnberg P Mann NP Banerjee R Saka HN Chapple JP King PJ Clark AJ Metherell LA 《Nature genetics》2012,44(7):740-742
Using targeted exome sequencing, we identified mutations in NNT, an antioxidant defense gene, in individuals with familial glucocorticoid deficiency. In mice with Nnt loss, higher levels of adrenocortical cell apoptosis and impaired glucocorticoid production were observed. NNT knockdown in a human adrenocortical cell line resulted in impaired redox potential and increased reactive oxygen species (ROS) levels. Our results suggest that NNT may have a role in ROS detoxification in human adrenal glands. 相似文献
222.
Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8 总被引:7,自引:0,他引:7
Moseley ML Zu T Ikeda Y Gao W Mosemiller AK Daughters RS Chen G Weatherspoon MR Clark HB Ebner TJ Day JW Ranum LP 《Nature genetics》2006,38(7):758-769
223.
Zhiliang Chen Xuanyang Zhang Feng Shen Jixiang Zhao Yuping Liu Wenqing Tang Clark B. Burchfiel Robert W. King Leigh H. Royden 《科学通报(英文版)》1999,44(19):1804-1804
Through GPS carrier phases observation in southwestern China during 1991–1997, the velocity field within eastern Qinghai-Xizang
(Tibet) and its neighbour regions has been established. The velocity of those sites in and west of Chuan-Dian block is mostly
5–10 mm · a™1 relative to the fiduciary station CHDU (Chengdu), and the motion in Chuan-Qing and Yangtze blocks east of the Xianshuihe-Xiaojiang
fault is weak with a velocity of about 0–7 mm · a−1. The velocity vector in these areas indicates a clockwise rotation vortex rather than the so-called intensive eastward pushing
or eastward escape. The main pattern of the crustal deformation is a clockwise rotation vortex structure and a differential
slip along the boundary fault between different blocks. 相似文献
224.
225.
Lizard cells from the tails of geckos were readily morphologically and antigenically transformed in vitro by SV40 virus. Neither autografts of these cells nor allografts of SV40 transformed gecko embryo cells produced tumors in animals under observation for 1 to 3 years. 相似文献
226.
Jeroen Middelbeek Kristopher Clark Hanka Venselaar Martijn A. Huynen Frank N. van Leeuwen 《Cellular and molecular life sciences : CMLS》2010,67(6):875-890
The alpha-kinase family represents a class of atypical protein kinases that display little sequence similarity to conventional
protein kinases. Early studies on myosin heavy chain kinases in Dictyostelium discoideum revealed their unusual propensity to phosphorylate serine and threonine residues in the context of an alpha-helix. Although
recent studies show that some members of this family can also phosphorylate residues in non-helical regions, the name alpha-kinase
has remained. During evolution, the alpha-kinase domains combined with many different functional subdomains such as von Willebrand
factor-like motifs (vWKa) and even cation channels (TRPM6 and TRPM7). As a result, these kinases are implicated in a large
variety of cellular processes such as protein translation, Mg2+ homeostasis, intracellular transport, cell migration, adhesion, and proliferation. Here, we review the current state of knowledge
on different members of this kinase family and discuss the potential use of alpha-kinases as drug targets in diseases such
as cancer. 相似文献
227.
Tim W. Clark 《西北部美国博物学家》2011,41(2)
Some relationships between home range, agonistic behavior, and reproductive patterns in thirteen-lined ground squirrels were investigated in Laramie Plains, Wyoming (August 1966–April 1969). Population size and densities fluctuated seasonally and annually. Adult male (N = 7) home ranges averaged 0.24 ha and were smaller than those of the female (N = 9), which averaged 0.35 ha. Agonistic interactions were more frequent during the natal period (late May–June) than during the breeding-gestation period (mid April–May). Most squirrels (86 percent) shared capture sites and had overlapping home ranges. However, a certain degree of spacing existed because of agonistic behavior. 相似文献
228.
229.
Thirty-nine previously unpublished reports of the endangered black-footed ferret from Wyoming are listed with dates, locations, number of animals, sources, and comments. 相似文献
230.