全文获取类型
收费全文 | 4097336篇 |
免费 | 328308篇 |
国内免费 | 14102篇 |
专业分类
耳鼻咽喉 | 56083篇 |
儿科学 | 129183篇 |
妇产科学 | 107434篇 |
基础医学 | 633264篇 |
口腔科学 | 112877篇 |
临床医学 | 374993篇 |
内科学 | 733971篇 |
皮肤病学 | 104639篇 |
神经病学 | 341276篇 |
特种医学 | 160520篇 |
外国民族医学 | 482篇 |
外科学 | 621140篇 |
综合类 | 118411篇 |
现状与发展 | 24篇 |
一般理论 | 2507篇 |
预防医学 | 342466篇 |
眼科学 | 95323篇 |
药学 | 290496篇 |
29篇 | |
中国医学 | 11281篇 |
肿瘤学 | 203347篇 |
出版年
2021年 | 55691篇 |
2020年 | 35452篇 |
2019年 | 58359篇 |
2018年 | 73013篇 |
2017年 | 55850篇 |
2016年 | 61662篇 |
2015年 | 75224篇 |
2014年 | 109591篇 |
2013年 | 174893篇 |
2012年 | 112089篇 |
2011年 | 115615篇 |
2010年 | 122552篇 |
2009年 | 125104篇 |
2008年 | 102176篇 |
2007年 | 108236篇 |
2006年 | 117157篇 |
2005年 | 112180篇 |
2004年 | 113138篇 |
2003年 | 103589篇 |
2002年 | 92977篇 |
2001年 | 146596篇 |
2000年 | 140934篇 |
1999年 | 131984篇 |
1998年 | 69140篇 |
1997年 | 65873篇 |
1996年 | 64004篇 |
1995年 | 59420篇 |
1994年 | 53450篇 |
1993年 | 49792篇 |
1992年 | 95325篇 |
1991年 | 91394篇 |
1990年 | 87826篇 |
1989年 | 86011篇 |
1988年 | 79265篇 |
1987年 | 77378篇 |
1986年 | 73651篇 |
1985年 | 71835篇 |
1984年 | 61513篇 |
1983年 | 55263篇 |
1982年 | 46028篇 |
1981年 | 42961篇 |
1980年 | 40575篇 |
1979年 | 53071篇 |
1978年 | 43742篇 |
1977年 | 39523篇 |
1976年 | 36003篇 |
1975年 | 36054篇 |
1974年 | 39015篇 |
1973年 | 37834篇 |
1972年 | 35712篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
best practice onkologie - 相似文献
992.
993.
994.
995.
996.
997.
998.
Stuart J. Dilley Tracey J. Weiland Robert O’Brien Neil J. Cunningham Julian E. Van Dijk Rosie M. Mahoney 《Teaching and learning in medicine》2015,27(1):71-79
Theory: Immersive simulation is a common mode of education for medical students. Observation of clinical simulations prior to participation is believed to be beneficial, though this is often a passive process. Active observation may be more beneficial. Hypotheses: The hypothesis tested in this study was that the active use of a simple checklist during observation of an immersive simulation would result in better participant performance in a subsequent scenario compared with passive observation alone. Methods: Medical students were randomized to either passive or active (with checklist) observation of an immersive simulation involving cardiac arrest prior to participating in their own simulation. Performance measures included time to cardiopulmonary resuscitation (CPR) and time to defibrillation and were compared between first and second scenarios as well as between passive and active observers. Results: Seventy-nine simulations involving 232 students were conducted. Mean time to CPR was 18 seconds (SD = 11.6) for those using the checklist and 24 seconds (SD = 15.8) for those who observed passively (M difference = 6 seconds), t(35) = 1.46, p =.153. Time to defibrillation was 94 seconds (SD = 26.4) for those using the checklist and 92 seconds (SD = 23.8) for those who observed passively (M difference = –2 seconds), t(38) =.21, p =.837. Time to CPR was 24 seconds (SD = 15.8) for passive observers and 31 seconds (SD = 21.0; M difference = 7 seconds), t(35) = 1.13, p =.265, for their first scenario counterparts. Time to CPR was 18 seconds (SD = 11.6) for active observers and 36 seconds (SD = 26.2; M difference = 18 seconds), t(24) = 2.81, p =.010, for their first scenario counterparts. Time to defibrillation was 92 seconds (SD = 23.8) for passive observers and 125 seconds (SD = 32.2; M difference = 33 seconds), t(33) = 3.63, p =.001, for their first scenario counterparts. Time to defibrillation was 94 seconds (SD = 26.4) for the active observers and 132 seconds (SD = 52.9; M difference = 38 seconds), t(28) =.46, p =.008, for their first scenario counterparts. Conclusions: Observation alone leads to improved performance in the management of a simulated cardiac arrest. The active use of a simple skills-based checklist during observation did not appear to improve performance over passive observation alone. 相似文献
999.
Ling Zhang Xue-Jun Shang Hong-Fei Li Yu-Qin Shi Wei Li Maria E Teves Zhi-Qiong Wang Gao-Feng Jiang Shi-Zhen Song Zhi-Bing Zhang 《Asian journal of andrology》2015,17(1):86-93
Mammalian spermatogenesis is a well-organized process of cell development and differentiation. Meiosis expressed gene 1 (MEIG1) plays an essential role in the regulation of spermiogenesis. To explore potential mechanisms of MEIG1''s action, a yeast two-hybrid screen was conducted, and several potential binding partners were identified; one of them was membrane occupation and recognition nexus repeat containing 3 (MORN3). MORN3 mRNA is only abundant in mouse testis. In the testis, Morn3 mRNA is highly expressed in the spermiogenesis stage. Specific anti-MORN3 polyclonal antibody was generated against N-terminus of the full-length MORN3 protein, and MORN3 expression and localization was examined in vitro and in vivo. In transfected Chinese hamster ovary cells, the antibody specifically crossed-reacted the full-length MORN3 protein, and immunofluorescence staining revealed that MORN3 was localized throughout the cytoplasm. Among multiple mouse tissues, about 25 kDa protein, was identified only in the testis. The protein was highly expressed after day 20 of birth. Immunofluorescence staining on mixed testicular cells isolated from adult wild-type mice demonstrated that MORN3 was expressed in the acrosome in germ cells throughout spermiogenesis. The protein was also present in the manchette of elongating spermatids. The total MORN3 expression and acrosome localization were not changed in the Meig 1-deficient mice. However, its expression in manchette was dramatically reduced in the mutant mice. Our studies suggest that MORN3 is another regulator for spermatogenesis, probably together with MEIG1. 相似文献
1000.