全文获取类型
收费全文 | 1689382篇 |
免费 | 118807篇 |
国内免费 | 2413篇 |
专业分类
耳鼻咽喉 | 23873篇 |
儿科学 | 57321篇 |
妇产科学 | 44991篇 |
基础医学 | 254168篇 |
口腔科学 | 43563篇 |
临床医学 | 149902篇 |
内科学 | 329706篇 |
皮肤病学 | 37424篇 |
神经病学 | 126799篇 |
特种医学 | 66508篇 |
外国民族医学 | 706篇 |
外科学 | 256425篇 |
综合类 | 33134篇 |
现状与发展 | 2篇 |
一般理论 | 471篇 |
预防医学 | 126602篇 |
眼科学 | 37678篇 |
药学 | 126588篇 |
3篇 | |
中国医学 | 3244篇 |
肿瘤学 | 91494篇 |
出版年
2018年 | 17498篇 |
2017年 | 13077篇 |
2016年 | 14641篇 |
2015年 | 16466篇 |
2014年 | 22624篇 |
2013年 | 34299篇 |
2012年 | 47955篇 |
2011年 | 51562篇 |
2010年 | 30556篇 |
2009年 | 28553篇 |
2008年 | 48805篇 |
2007年 | 52714篇 |
2006年 | 52618篇 |
2005年 | 50986篇 |
2004年 | 49781篇 |
2003年 | 48195篇 |
2002年 | 47303篇 |
2001年 | 79912篇 |
2000年 | 82701篇 |
1999年 | 69916篇 |
1998年 | 19048篇 |
1997年 | 17052篇 |
1996年 | 17471篇 |
1995年 | 16556篇 |
1994年 | 15518篇 |
1993年 | 14518篇 |
1992年 | 55221篇 |
1991年 | 55302篇 |
1990年 | 54068篇 |
1989年 | 51865篇 |
1988年 | 47796篇 |
1987年 | 47029篇 |
1986年 | 43834篇 |
1985年 | 42061篇 |
1984年 | 31376篇 |
1983年 | 26483篇 |
1982年 | 15052篇 |
1981年 | 13712篇 |
1979年 | 28436篇 |
1978年 | 19917篇 |
1977年 | 16660篇 |
1976年 | 16097篇 |
1975年 | 18011篇 |
1974年 | 20733篇 |
1973年 | 19946篇 |
1972年 | 18410篇 |
1971年 | 17033篇 |
1970年 | 16002篇 |
1969年 | 14620篇 |
1968年 | 13497篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
R C Pattinson L C Snyman A P Macdonald 《Suid-Afrikaanse tydskrif vir geneeskunde》2006,96(11):1191-1194
AIM: To evaluate whether the introduction of a strict protocol approach based on the systemic evaluation of critically ill pregnant women with complications of abortion affected outcome. SETTING: Indigent South Africans managed in the regional and tertiary hospitals of the Pretoria Academic Complex. METHOD: Since 1997 a standard definition of severe acute maternal morbidity (SAMM) has been used in the Pretoria Academic Complex. All cases of SAMM and maternal deaths were entered on the Maternal Morbidity and Mortality Audit System programme. A comparison of outcome of severely ill women who had complications of abortion was made between 1997-1998 (original protocol) and 2002-2004 (strict protocol). OUTCOME MEASURES: The mortality index and prevalence of organ system failure or dysfunction. RESULTS: In 1997-1998 there were 43 women with SAMM who survived and a further 10 maternal deaths due to complications of abortion, compared with 107 women with SAMM and 7 maternal deaths during 2002-2004. The mortality index declined from 18.9% in 1997-1998 to 6.1% in 2002-2004 (p = 0.02, odds ratio 0.28, 95% confidence limits 0.10 - 0.79). Significantly more women had hypovolaemic shock in 2002-2004 compared with 1997-1998 (54.4% v. 35.8%, p = 0.04), but fewer women had immune system failure including septic shock (18.4% v. 47.2%, p = 0.0002) and metabolic dysfunction (0 v. 5.7%, p = 0.03) and there was a trend to less renal failure (10.5% v. 22.6%, p = 0.06) and cardiac failure (4.4% v. 13.2%, p = 0.08). CONCLUSION: The strict protocol approach based on systemic evaluation in managing critically ill pregnant women with complications of abortion, coupled with an intensive, regular feedback mechanism, has been associated with a reduction in the mortality index. 相似文献
25.
26.
S Dvorakova E Vaclavikova A Ryska J Cap P Vlcek J Duskova D Kodetova V Holub Z Novak B Bendlova 《Experimental and clinical endocrinology & diabetes》2006,114(4):192-196
Medullary thyroid carcinoma (MTC) is a rare form of thyroid cancer representing about 10% of all thyroid malignancies. It occurs mostly as a sporadic tumor or in association with autosomal dominant inherited cancer syndromes--multiple endocrine neoplasia (MEN) types 2A and 2B and familial MTC. Germline mutations in exons 8, 10, 11, 13, 14, 15 and 16 of the RET proto-oncogene are found in most of the familial cases. There are only a few published data reporting multiple germline mutations in the RET proto-oncogene. We have detected double germline mutations in 2 different exons on the same RET allele in two MEN 2 families. In the MEN 2A family, double germline mutation in exons 10 (Cys620Phe) and 13 (Tyr791Phe) was detected. In the MEN 2B family, beside the classical germline mutation in exon 16 (Met918Thr) a second germline mutation in exon 13 (Tyr791Phe) was found. This study revealed that MEN 2 syndromes can also be caused by double germline mutations in the RET proto-oncogene and these families can be added to small worldwide cohort of families with multiple germline mutations. 相似文献
27.
28.
29.
30.