全文获取类型
收费全文 | 9052篇 |
免费 | 485篇 |
国内免费 | 17篇 |
出版年
2024年 | 16篇 |
2023年 | 127篇 |
2022年 | 313篇 |
2021年 | 452篇 |
2020年 | 237篇 |
2019年 | 280篇 |
2018年 | 295篇 |
2017年 | 230篇 |
2016年 | 389篇 |
2015年 | 450篇 |
2014年 | 488篇 |
2013年 | 722篇 |
2012年 | 639篇 |
2011年 | 710篇 |
2010年 | 391篇 |
2009年 | 357篇 |
2008年 | 441篇 |
2007年 | 427篇 |
2006年 | 380篇 |
2005年 | 320篇 |
2004年 | 297篇 |
2003年 | 251篇 |
2002年 | 255篇 |
2001年 | 94篇 |
2000年 | 71篇 |
1999年 | 77篇 |
1998年 | 55篇 |
1997年 | 55篇 |
1996年 | 31篇 |
1995年 | 37篇 |
1994年 | 50篇 |
1993年 | 35篇 |
1992年 | 35篇 |
1991年 | 33篇 |
1990年 | 28篇 |
1989年 | 31篇 |
1988年 | 40篇 |
1987年 | 31篇 |
1986年 | 25篇 |
1985年 | 40篇 |
1984年 | 30篇 |
1983年 | 28篇 |
1982年 | 36篇 |
1981年 | 21篇 |
1980年 | 24篇 |
1979年 | 22篇 |
1978年 | 17篇 |
1977年 | 20篇 |
1976年 | 13篇 |
1973年 | 13篇 |
排序方式: 共有9554条查询结果,搜索用时 15 毫秒
111.
Carlos E. Nasjleti Charles J. Kowalski James E. Harris Nadia A. Abu Elsoued Mohamed M. Nofal 《Human genetics》1979,47(2):203-205
Summary A total of 242 metaphase plates from the peripheral blood of Nubian males living near Aswan, Egypt were studied with respect to the length of the Y chromosome and its location in metaphase spreads. The length of the Y was similar to that found in American Negroes, and the Y chromosome was peripherally located in 79 of the 242 cells. 相似文献
112.
M C Garel W Hassan M T Coquelet M Goossens J Rosa N Arous 《Biochimica et biophysica acta》1976,420(1):97-104
The present report describes clinical, hematological and biochemical studies of a 27-year old Egyptian woman in whom a fast moving Hb variant was found. The abnormal Hb constituted 48% of the total erythrocyte Hb of the propositus and her father. Structural studies demonstrated that in the abnormal Hb lysine beta 65 is replaced by glutamine. The new Hb mutant is designated hemoglobin J Cairo beta 65 (E9) Lys leads to Gln. This substitution results in only a moderate decrease in cooperativity. No evidence of Hb instability was found. A slight anemic state has been observed in the propositus since she reached adolescence. 相似文献
113.
Summary This paper elaborates on the notion of homogeneity in plant populations and its quantification. It describes a method for testing homogeneity without the need to make assumptions about generalized distributions. The implementation of the method is illustrated through actual numerical examples.This paper presents results from a study of plant populations for which a National Research Council of Canade grant has been received (L. Orlóci). 相似文献
114.
S. T. Hassan 《Entomologia Experimentalis et Applicata》1976,20(2):199-205
The areas of discovery ofApanteles glomeratus, Pteromalus puparum andBrachymeria regina were calculated using two different models. Increasing host or parasite density generally resulted in an initial increase
followed by a decrease in area of discovery. 相似文献
115.
116.
117.
118.
119.
Rasoul Ghasemi Leila Dargahi Ali Haeri Maryam Moosavi Zahurin Mohamed Abolhassan Ahmadiani 《Molecular neurobiology》2013,47(3):1045-1065
Arduous efforts have been made in the last three decades to elucidate the role of insulin in the brain. A growing number of evidences show that insulin is involved in several physiological function of the brain such as food intake and weight control, reproduction, learning and memory, neuromodulation and neuroprotection. In addition, it is now clear that insulin and insulin disturbances particularly diabetes mellitus may contribute or in some cases play the main role in development and progression of neurodegenerative and neuropsychiatric disorders. Focusing on the molecular mechanisms, this review summarizes the recent findings on the involvement of insulin dysfunction in neurological disorders like Alzheimer’s disease, Parkinson’s disease and Huntington’s disease and also mental disorders like depression and psychosis sharing features of neuroinflammation and neurodegeneration. 相似文献
120.