全文获取类型
收费全文 | 6657篇 |
免费 | 403篇 |
国内免费 | 20篇 |
学科分类
医药卫生 | 7080篇 |
出版年
2023年 | 49篇 |
2022年 | 104篇 |
2021年 | 217篇 |
2020年 | 116篇 |
2019年 | 154篇 |
2018年 | 173篇 |
2017年 | 114篇 |
2016年 | 145篇 |
2015年 | 157篇 |
2014年 | 272篇 |
2013年 | 331篇 |
2012年 | 524篇 |
2011年 | 490篇 |
2010年 | 275篇 |
2009年 | 235篇 |
2008年 | 368篇 |
2007年 | 377篇 |
2006年 | 356篇 |
2005年 | 328篇 |
2004年 | 307篇 |
2003年 | 224篇 |
2002年 | 210篇 |
2001年 | 144篇 |
2000年 | 125篇 |
1999年 | 106篇 |
1998年 | 42篇 |
1997年 | 36篇 |
1996年 | 27篇 |
1995年 | 27篇 |
1993年 | 23篇 |
1992年 | 55篇 |
1991年 | 69篇 |
1990年 | 67篇 |
1989年 | 66篇 |
1988年 | 45篇 |
1987年 | 52篇 |
1986年 | 61篇 |
1985年 | 50篇 |
1984年 | 46篇 |
1983年 | 43篇 |
1982年 | 32篇 |
1981年 | 36篇 |
1979年 | 46篇 |
1978年 | 32篇 |
1977年 | 34篇 |
1976年 | 34篇 |
1975年 | 32篇 |
1974年 | 28篇 |
1973年 | 22篇 |
1972年 | 21篇 |
排序方式: 共有7080条查询结果,搜索用时 15 毫秒
1.
The goals of this report are: 1) to review the number needed to treat (NNT) concept, which, although well established in many sectors of medicine, is still relatively new to the radiotherapy community; 2) to discuss several clinical radiotherapy examples illustrating the inherent advantages of the NNT approach; and 3) to discuss potential future roles of the NNT concept within radiotherapy. 相似文献
2.
Melita Kosanovic Mohammad Yousif Hasan Dhanasekhar Subramanian Abdulla Ali Falah Al Ahbabi Omar Ali Awn Al Kathiri Essa Mohammed Ali Abdulla Aleassa Abdu Adem 《Food and chemical toxicology》2007,45(11):2261-2266
We hypothesized that increased ambient concentrations of metals, as a consequence of escalating urbanization and industrialization of the Gulf region will respond in increased contamination of edible fish species. In this study, we report concentrations of chromium, manganese, cobalt, copper, zinc, arsenic, cadmium, mercury and lead in meat and liver of wild Red-spot emperor (Lethrinus lentjan) from three sampling points at the UAE coast. Analysis was performed by the ICP-MS/microwave digestion. Our study has shown that meat and liver metal content was significantly higher in areas with higher industrial activity, although metal values did not exceed permitted levels of fish for human consumption. 相似文献
3.
Prasanna Kumar Reddy R Venkata Subramanian S Yuvaraja 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2005,9(3):356-357
Transposition of the gallbladder to the left side without situs inversus viscerum is rare. These gallbladders are situated under the left lobe of the liver between Segment III and IV or on Segment III to the left of the falciform ligament. Because routine preoperative studies may not detect the anomaly, it may provide the surgeons with an unusual surprise during laparoscopy. Awareness of the unpredictable confluence of the cystic duct into the common bile duct and selective use of intraoperative cholangiography aid in the safe laparoscopic management of this unusual problem. 相似文献
4.
5.
Radhika Srinivasan Raje Nijhawan Upasana Gautam Pradeep Bambery 《Diagnostic cytopathology》1994,10(4):383-384
A case of primary amyloidosis, initially detected by fine-needle aspiration of the liver, is reported here. Amorphous acellular metachromatic material was seen extracellularly in between the hepatocytic cords compressing them. This material showed typical apple-green birefringence under crossed bipolars after alkaline Congo-red staining proved its amyloid nature. It was resistant to potassium permanganate pretreatment, indicating it to be of the AL type. © 1994 Wiley-Liss, Inc. 相似文献
6.
7.
8.
9.
Amyloid plaque deposition involves the aggregation of normally soluble proteins into insoluble amyloid fibrils (fibrillization) and proceeds through intermediates with distinct morphologies, including spherical aggregates, protofibrils, and mature fibrils. Recently, a novel annular protofibril-like intermediate with unique pore-like properties was produced by alpha-synuclein, A beta-Arctic and amylin, which are proteins associated with Parkinson's disease, Alzheimer's disease, and type-II diabetes. The observation of annular structures coupled with size selective channel-like activity by these proteins suggests that these structures may be responsible for vesicle permeability by ion-channel formation. Using atomic force spectroscopy, we report here that the ABri peptide associated with familial British dementia produces similar annular and ring-like protofibril structures during the following sequence of events: spherical aggregates (0.4-1.5 nm height)-->chain-like protofibrils (1.5-2.3 nm height)-->ring-like protofibrils and annular protofibrils (1.5-2.3 nm height). This suggests that ABri fibrillization occurs in a similar fashion to other amyloidogenic proteins and that the annular protofibrillar structures may represent a common amyloid intermediate. 相似文献
10.