首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   526220篇
  免费   55900篇
  国内免费   347篇
  2021年   4144篇
  2018年   5468篇
  2017年   5264篇
  2016年   7568篇
  2015年   10980篇
  2014年   12495篇
  2013年   17311篇
  2012年   20441篇
  2011年   20356篇
  2010年   13436篇
  2009年   12223篇
  2008年   18006篇
  2007年   18224篇
  2006年   17577篇
  2005年   16721篇
  2004年   16408篇
  2003年   15778篇
  2002年   15337篇
  2001年   20885篇
  2000年   20913篇
  1999年   17352篇
  1998年   6949篇
  1997年   6751篇
  1996年   6503篇
  1995年   5917篇
  1994年   6005篇
  1993年   5873篇
  1992年   14058篇
  1991年   13453篇
  1990年   13274篇
  1989年   13152篇
  1988年   12049篇
  1987年   11394篇
  1986年   10594篇
  1985年   10675篇
  1984年   8889篇
  1983年   7695篇
  1982年   6094篇
  1981年   5453篇
  1980年   5172篇
  1979年   8356篇
  1978年   6550篇
  1977年   5795篇
  1976年   5596篇
  1975年   6041篇
  1974年   6298篇
  1973年   6135篇
  1972年   5579篇
  1971年   4945篇
  1970年   4328篇
排序方式: 共有10000条查询结果,搜索用时 765 毫秒
161.
Anthers of Vitis latifolia L. (wild grape) cultured on Nitsch and Nitsch medium supplemented with 20 μM 2,4-D and 9 μM BAP produced callus after 4–6 weeks. Subculture of callus onto Nitsch and Nitsch medium containing 10 μM NAA produced somatic embryos within 6 weeks. On growth regulator-free Nitsch and Nitsch basal medium somatic embryos converted to plantlets in 6–8 weeks. One gram of callus produced more than 400 somatic embryos with 13.7% being converted to complete plantlets, which were subsequently established in soil. Regenerated plants were found to have mixoploid populations of cells, 2n = 38 and n = 19. Received: 23 May 1998 / Revision received: 21 September 1998 / Accepted: 10 October 1998  相似文献   
162.
163.
This is the eleventh part of our series of studies on Orthocladiinae from India. Two new species of the genus Cricotopus, C. albipes and C. tenuisetosus are described in this paper.  相似文献   
164.
Nyikó  Tünde  Auber  Andor  Bucher  Etienne 《Plant molecular biology》2019,100(1-2):199-214
Plant Molecular Biology - Here we demonstrate that the APUM9 RNA-binding protein and its co-factors play a role in mRNA destabilization and how this activity might regulate early plant development....  相似文献   
165.
Local administration of phencyclidine (PCP) by pressure ejection elicited a dose-dependent slowing of the spontaneous discharge of cerebellar Purkinje neurons. Ketamine also depressed firing and was much less potent than PCP. Effects of both PCP and ketamine were antagonized by local or parenteral administration of antipsychotic drugs. The similarities between the electrophysiological and behavioral actions of phencyclidine suggest that alterations in neuronal discharge may underlie its psychotomimetic properties.  相似文献   
166.
The capacity of antigenic complexes of the causative agent of zoo- and anthroponotic trichophytosis for inducing the factors, that modify the functional activity of macrophages, in mice and in spleen cell cultures has been studied. These complexes are capable of inducing the T-lymphocyte-mediated suppression and of stimulating the fungicidal activity (and oxygen-dependent metabolism) of phagocytes. The production of fungicidal activity suppressing lymphokines is linked with the presence of alkali-insoluble components of fungal cell walls and cytoplasmic antigens (the latter appear only in interactions of antigens with the lymphocytes of immunized animals) in the above-mentioned complexes.  相似文献   
167.
Everyone agrees that insurance for long-term care is inadequate in the United States. Disagreement exists, however, on whether such insurance should be provided through the private or public sector. Private insurance generally uses the experience-rating principle that persons with higher risk of illness are charged higher premiums. For private insurance for long-term care, this principle creates a dilemma. Most policies will be purchased by the elderly; yet, because the elderly have a high risk of needing long-term care, only about 20% of them can afford the cost of premiums. A public-private partnership by which the government partially subsidizes private long-term-care insurance is unlikely to resolve this dilemma. Only a social insurance program for long-term care can provide universal, affordable, and equitable coverage.  相似文献   
168.
169.
The polycation protamine sulfate increases microvascular permeability in the kidney by reducing glomerular charge. We have exposed the pulmonary vasculature to protamine sulfate to determine whether electrical charges play a role in protein permeability in lung vascular beds. In anephric rats, protamine sulfate increased hematocrit approximately 25%. With protamine sulfate doses of 0.08 and 0.04 mg/g body wt, lung blood-free wet-to-dry weight ratios were increased (5.24 +/- 0.8 and 4.89 +/- 0.7) compared with control (3.85 +/- 0.3) (P less than 0.05). In isolated, ventilated, and perfused lungs 0.04 mg/g body wt protamine sulfate increased pulmonary arterial pressure from 5.2 +/- 1.4 to 16.3 +/- 3.9 mmHg (P less than 0.01). These lungs gained weight and lung wet-to-dry weight ratios were significantly increased (15.33 +/- 4.26 compared with 6.04 +/- 0.24 for control lungs). Poly-L-lysine, another polycation, also caused significant increases in pulmonary arterial pressure, lung weight, and lung wet-to-dry weight ratios. The addition of diphenhydramine to the perfusate 10 min before the addition of protamine sulfate did not prevent these changes. Heparin (90 U/mg protamine sulfate) reversed the abnormalities. Pulmonary arterial pressure (7.0 +/- 1.1 mmHg) was not significantly different from the control value, lung weight did not increase, and the lung wet-to-dry weight ratio was 6.24 +/- 0.23 (P greater than 0.05). We conclude that polycations have a significant effect on pulmonary vascular resistance and perhaps on permeability.  相似文献   
170.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号