全文获取类型
收费全文 | 17848篇 |
免费 | 1181篇 |
国内免费 | 59篇 |
专业分类
耳鼻咽喉 | 203篇 |
儿科学 | 435篇 |
妇产科学 | 324篇 |
基础医学 | 2601篇 |
口腔科学 | 365篇 |
临床医学 | 1641篇 |
内科学 | 4301篇 |
皮肤病学 | 287篇 |
神经病学 | 1667篇 |
特种医学 | 660篇 |
外国民族医学 | 1篇 |
外科学 | 2340篇 |
综合类 | 148篇 |
一般理论 | 5篇 |
预防医学 | 1287篇 |
眼科学 | 336篇 |
药学 | 1047篇 |
中国医学 | 42篇 |
肿瘤学 | 1398篇 |
出版年
2023年 | 145篇 |
2022年 | 326篇 |
2021年 | 643篇 |
2020年 | 328篇 |
2019年 | 494篇 |
2018年 | 570篇 |
2017年 | 426篇 |
2016年 | 442篇 |
2015年 | 522篇 |
2014年 | 684篇 |
2013年 | 899篇 |
2012年 | 1380篇 |
2011年 | 1382篇 |
2010年 | 832篇 |
2009年 | 725篇 |
2008年 | 1157篇 |
2007年 | 1139篇 |
2006年 | 1051篇 |
2005年 | 1057篇 |
2004年 | 1006篇 |
2003年 | 826篇 |
2002年 | 800篇 |
2001年 | 206篇 |
2000年 | 144篇 |
1999年 | 160篇 |
1998年 | 147篇 |
1997年 | 132篇 |
1996年 | 100篇 |
1995年 | 100篇 |
1994年 | 82篇 |
1993年 | 59篇 |
1992年 | 76篇 |
1991年 | 57篇 |
1990年 | 69篇 |
1989年 | 47篇 |
1988年 | 54篇 |
1987年 | 40篇 |
1986年 | 65篇 |
1985年 | 45篇 |
1984年 | 40篇 |
1983年 | 53篇 |
1982年 | 50篇 |
1981年 | 37篇 |
1980年 | 35篇 |
1979年 | 34篇 |
1978年 | 28篇 |
1977年 | 29篇 |
1976年 | 25篇 |
1975年 | 25篇 |
1974年 | 36篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Chouraqui Jean-Pierre Tavoularis Gabriel Simeoni Umberto Ferry Constance Turck Dominique 《European journal of nutrition》2020,59(1):67-80
European Journal of Nutrition - The French Nutri-Bébé 2013 study aimed to assess the nutritional intake of infants and young children in comparison with the recommendations of the 2013... 相似文献
2.
3.
4.
5.
6.
Renaud Snanoudj Nassim Kamar Elisabeth Cassuto Sophie Caillard Marie Metzger Pierre Merville Antoine Thierry Isabelle Jollet Philippe Grimbert Dany Anglicheau Marc Hazzan Gabriel Choukroun Bruno Hurault De Ligny Bénedicte Janbon Vincent Vuiblet Anne Devys Yann Le Meur Michel Delahousse Jean-Luc Taupin 《Kidney international》2019,95(6):1471-1485
7.
Factors predicting tracer uptake in somatostatin receptor and MIBG scintigraphy of metastatic gastroenteropancreatic neuroendocrine tumors. 总被引:1,自引:0,他引:1
Samer Ezziddin Timur Logvinski Charlotte Yong-Hing Hojjat Ahmadzadehfar Hans-Peter Fischer Holger Palmedo Jan Bucerius Michael J Reinhardt Hans-Jürgen Biersack 《Journal of nuclear medicine》2006,47(2):223-233
Radiolabeled octreotide analogs (Oct) and metaiodobenzylguanidine (MIBG) offer 2 different approaches for imaging and targeting metastatic gastroenteropancreatic neuroendocrine tumors (GEP-NET). Despite successful establishment of the revised World Health Organization (WHO) classification, which distinguishes between low- and high-grade malignant GEP-NET, there is a lack of scintigraphic studies comparing uptake behavior on the basis of this categorization. This study aims to define predisposing factors of tracer uptake for both imaging principles implementing the updated tumor criteria of the current WHO classification. METHODS: Fifty-seven consecutive patients with histologically confirmed metastatic GEP-NET evaluated with both 111In-pentetreotide and 123I/131I-MIBG scintigraphy were included in this study. Intensity of tracer uptake was graded according to the different metastatic regions. Patients were classified as overall positive when avid uptake in the clinically relevant tumor lesions was present. Correlation was tested between the proportion of positive patients and tumor origin, function, and malignancy. RESULTS: Overall, 52 patients (91.2%) were Oct positive and 28 patients (49.1%) were MIBG positive. The proportion of tracer-positive patients was significantly higher (P < 0.05) in low-grade malignant tumors for both tracers and in functioning as well as in gastroenteral NET for MIBG. Five patients were negative for both tracers. None of the Oct-negative patients proved to be MIBG positive. CONCLUSION: Oct affinity is observed with high frequency throughout the subgroups of metastatic GEP-NET, whereas corresponding MIBG uptake is overall less prevalent and more group dependent. Tumor differentiation significantly impacts both Oct and MIBG uptake, whereas functionality predisposes only for MIBG accumulation. Though clearly inferior to Oct-based radioimaging in most GEP-NET, MIBG achieves a remarkable rate of radioligand accumulation in functioning midgut enterochromaffin cell metastases (>80% of patients positive). These results may have implications for patient management and potentially for selection and performance of targeted therapy. 相似文献
8.
9.
10.
杨娅 Thomas Bartel Loredana Latina Guido Caspari 王新房 Raimund Erbel 《华中科技大学学报(医学英德文版)》2002,22(2):158-163
Coronary flow reserve (CFR) has been used toassess coronary microcirculation and epicardial coro-nary stenoses[1— 3 ] . CFR is defined as the ratio ofcoronary flow under maximal coronary vasodilatationto coronary flow under resting conditions[4 ] .Whenthe cross- sectional area of epicardial coronary arteriesis constant,coronary flow velocity (CFV) ratios areequal to volume flow ratios.The most common method used clinically formeasuring CFVR is intracoronary Doppler flow(ICD) analysis re… 相似文献