全文获取类型
收费全文 | 7684篇 |
免费 | 441篇 |
国内免费 | 11篇 |
出版年
2024年 | 14篇 |
2023年 | 101篇 |
2022年 | 102篇 |
2021年 | 378篇 |
2020年 | 187篇 |
2019年 | 212篇 |
2018年 | 243篇 |
2017年 | 211篇 |
2016年 | 355篇 |
2015年 | 426篇 |
2014年 | 436篇 |
2013年 | 622篇 |
2012年 | 594篇 |
2011年 | 624篇 |
2010年 | 353篇 |
2009年 | 320篇 |
2008年 | 421篇 |
2007年 | 373篇 |
2006年 | 347篇 |
2005年 | 293篇 |
2004年 | 272篇 |
2003年 | 225篇 |
2002年 | 213篇 |
2001年 | 64篇 |
2000年 | 54篇 |
1999年 | 54篇 |
1998年 | 48篇 |
1997年 | 47篇 |
1996年 | 29篇 |
1995年 | 35篇 |
1994年 | 37篇 |
1993年 | 32篇 |
1992年 | 25篇 |
1991年 | 24篇 |
1990年 | 22篇 |
1989年 | 26篇 |
1988年 | 27篇 |
1987年 | 25篇 |
1986年 | 8篇 |
1985年 | 26篇 |
1984年 | 26篇 |
1983年 | 19篇 |
1982年 | 26篇 |
1981年 | 20篇 |
1980年 | 20篇 |
1979年 | 11篇 |
1978年 | 14篇 |
1977年 | 11篇 |
1974年 | 8篇 |
1966年 | 7篇 |
排序方式: 共有8136条查询结果,搜索用时 62 毫秒
91.
92.
93.
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
94.
95.
The duration of the cell generation, the chronology, and the pattern of chromosome duplication was studied in the bone marrow of Gallus domesticus. The duration of the phases of the cell cycle is: cell generation 17.5 hours, S period 9 hours. G2 period plus prophase stage 2.5 hours, G1 period 6 hours. Chromosome replication begins at many sites. During middle S it extends to the whole complement and finally finishes in small, late replicating regions of the macrochromosomes. Interchromosomal asynchrony of duplication at the initiation or at the end of the S period was not observed. Z-chromosomes begin and finish DNA synthesis synchronously with the other macrochromosomes. The W-chromosome in females is the last microchromosome to finish replication. However it ends DNA synthesis at about the same time as the macrochromosomes. Similarities and differences between chromosome replication in Aves and Mammalia are considered. 相似文献
96.
97.
Wali Ahmidin Wubulikasimu Atikan yanhua Gao Omar Adil Arken Amina Yili Abulimiti Aisa Haji Akber 《International journal of peptide research and therapeutics》2020,26(4):1803-1818
International Journal of Peptide Research and Therapeutics - The purpose of this study was to separate and purify antioxidant peptides from the scorpion (Buthus martensii Karsch) protein... 相似文献
98.
The current study investigated the effect of developmental stages on the chemical composition and the antioxidant activity of fifteen crude oil samples obtained from Pistacia atlantica Desf. leaves, galls, and fruits. Twelve fatty acids were detected by GC/FID, linolenic acid (C18 : 3) was the major fatty acid detected in leaves crude oils that registered [41.73 % (P<0.05)] on the last stage. The best content of tocopherols and carotenoids was recorded at the last stage for leaves and galls oils, respectively, with values of [1.530±0.01, 0.52±0.01 (P<0.05) mg α‐tocopherol equivalent/g DW] and [86.60±0.95, 69.15±0.13 (P<0.05) μg β‐carotene equivalent/g DW]. For fruits oils, the content varied depending on the levels of fruits maturation. The results from DPPH, FRAP, and ABTS assays revealed that the antioxidant activity increased with the increasing content of tocopherols and carotenoids in leaves and galls oils during development stages, and varied for fruits oils depending on the ripening stages. Moreover, according to PCA analysis, the best phytoconstituent content and antioxidant activity were attributed to P. atlantica Desf. fruit's crude oils. Also, a strong relationship was found between the antioxidant activity and bioactive phytochemical components, such as tocopherols, carotenoids, and omega‐three fatty acid, which confirmed that P. atlantica Desf. crude oils present a valuable source of natural antioxidant that could be used for pharmaceutical and food industries purposes. 相似文献
99.
ElFihry Raouia Elmessaoudi-Idrissi Mohcine Jadid Fatima-Zahra Zaidane Imane Chihab Hajar Tahiri Mohamed Kabine Mostafa Badre Wafaa Chemin Isabelle Marchio Agnes Pineau Pascal Ezzikouri Sayeh Benjelloun Soumaya 《中国病毒学》2020,35(5):566-574
Virologica Sinica - Hepatitis C virus (HCV) is still one of the main causes of liver disease worldwide. Metabolic disorders, including non-alcoholic fatty liver disease (NAFLD), induced by HCV have... 相似文献
100.