全文获取类型
收费全文 | 1217972篇 |
免费 | 81082篇 |
国内免费 | 1962篇 |
专业分类
耳鼻咽喉 | 16598篇 |
儿科学 | 38111篇 |
妇产科学 | 30943篇 |
基础医学 | 172236篇 |
口腔科学 | 32711篇 |
临床医学 | 109123篇 |
内科学 | 233669篇 |
皮肤病学 | 27351篇 |
神经病学 | 94629篇 |
特种医学 | 49167篇 |
外国民族医学 | 215篇 |
外科学 | 185801篇 |
综合类 | 23471篇 |
现状与发展 | 1篇 |
一般理论 | 372篇 |
预防医学 | 85399篇 |
眼科学 | 27521篇 |
药学 | 95260篇 |
7篇 | |
中国医学 | 3018篇 |
肿瘤学 | 75413篇 |
出版年
2021年 | 10558篇 |
2019年 | 10556篇 |
2018年 | 14505篇 |
2017年 | 11387篇 |
2016年 | 12919篇 |
2015年 | 14450篇 |
2014年 | 19847篇 |
2013年 | 28409篇 |
2012年 | 39808篇 |
2011年 | 42215篇 |
2010年 | 24696篇 |
2009年 | 23284篇 |
2008年 | 38765篇 |
2007年 | 41252篇 |
2006年 | 41852篇 |
2005年 | 40190篇 |
2004年 | 38145篇 |
2003年 | 36312篇 |
2002年 | 35010篇 |
2001年 | 61845篇 |
2000年 | 63009篇 |
1999年 | 52731篇 |
1998年 | 14198篇 |
1997年 | 12404篇 |
1996年 | 12221篇 |
1995年 | 11466篇 |
1994年 | 10369篇 |
1993年 | 9775篇 |
1992年 | 38925篇 |
1991年 | 37302篇 |
1990年 | 36630篇 |
1989年 | 35137篇 |
1988年 | 31671篇 |
1987年 | 30743篇 |
1986年 | 28998篇 |
1985年 | 27210篇 |
1984年 | 20009篇 |
1983年 | 16848篇 |
1982年 | 9699篇 |
1979年 | 17611篇 |
1978年 | 12001篇 |
1977年 | 10717篇 |
1976年 | 9307篇 |
1975年 | 10464篇 |
1974年 | 12103篇 |
1973年 | 11685篇 |
1972年 | 11122篇 |
1971年 | 10366篇 |
1970年 | 9520篇 |
1969年 | 9151篇 |
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
931.
932.
The overall goal of this paper is to provide for the first time a comprehensive critical review of the literature on contraceptive failure in developed countries, primarily the United States. The first two sections of our paper lay the groundwork for a critical assessment of the extensive body of studies on this subject, by systematically exploring the concepts and measurement of contraceptive efficacy and the methodological pitfalls that snare many investigators and compromise their results. The next two sections focus on results in the literature. First we provide a method-by-method critique of the available studies and then we summarize our conclusions in a single table that provides efficacy information necessary for women and couples to make an informed choice of a method of contraception. We close with a set of substantive observations and also a set of methodological recommendations intended to improve the quality and comparability of findings from future research. 相似文献
933.
Hirschsprung's disease in young adults 总被引:3,自引:0,他引:3
Hirschsprung's disease is rarely seen in the young adult, and presents unique problems in management because of the massive dilatation and hypertrophy that occur proximal to the aganglionic rectum or the rectosigmoid colon. The diagnosis, which may be suspected by barium enema, is confirmed by suction or full-thickness biopsy of the rectum that may be complemented by anal manometry. Based on our experience with eight patients, a two-stage surgical reconstruction is recommended, with a preliminary sigmoid colostomy through the normally innervated colon and an associated defunctionalized stoma constituting the initial operation. The distal colonic stoma permits cleansing of the caudal colon while the normally innervated proximal colon reverts to near normal caliber, usually within 2 to 6 months. This approach is in accord with the recommendation of Fairgrieve. Reconstruction using a Duhamel or Soave procedure has given good results. The Duhamel procedure seems preferable when a considerable discrepancy remains between the ganglionic and aganglionic segments of rectum. 相似文献
934.
K Samanta B Pal 《International journal for vitamin and nutrition research. Internationale Zeitschrift für Vitamin- und Ern?hrungsforschung. Journal international de vitaminologie et de nutrition》1986,56(1):105-108
Supplementation of the diet of adult male rats with 4,000 ppm zinc as ZnSO4 for 30 to 32 days increased the zinc content in the testis and sperm by 25 and 18 per cent respectively, but did not change the same in accessory reproductive tissues, e.g. epididymis, seminal vesicle and prostate. The incidence of conception from mating between normal females and zinc fed males was lower as compared to mating between normal females and control males. This observation indicated reduced fertility of the males resulting from additional zinc ingestion. Motility of the sperm collected from the epididymis (tail) of the zinc treated rats was found to be inhibited. It has been suggested that excess zinc in the sperm was responsible for their poor motility and hence a reduced fertilising capacity. 相似文献
935.
936.
937.
938.
939.
940.
D S Rao R Antonelli K R Kane J E Kuhn C Hetnal 《Henry Ford Hospital medical journal》1991,39(1):41-44
Coexistent primary hyperparathyroidism and monoclonal gammopathy, although rare, has been reported previously by a number of investigators. We report four patients with such an occurrence who were seen between 1976 and 1988. Another patient with primary hyperparathyroidism also had multiple myeloma and was in remission for 12 years. These patients represent approximately 1% of the 386 patients with primary hyperparathyroidism seen during the same 12-year period. Although several mechanisms have been proposed to explain this concurrence, we believe it is the result of a chance occurrence. A review of the literature, an estimate of the chance occurrence of coincidental monoclonal gammopathy, benign or malignant, in patients with primary hyperparathyroidism, and some practical implications of this interesting coexistence are presented. 相似文献