全文获取类型
收费全文 | 1799099篇 |
免费 | 118696篇 |
国内免费 | 3347篇 |
专业分类
耳鼻咽喉 | 25789篇 |
儿科学 | 54965篇 |
妇产科学 | 49434篇 |
基础医学 | 270043篇 |
口腔科学 | 50789篇 |
临床医学 | 155885篇 |
内科学 | 343035篇 |
皮肤病学 | 40642篇 |
神经病学 | 135061篇 |
特种医学 | 70995篇 |
外国民族医学 | 483篇 |
外科学 | 276920篇 |
综合类 | 37482篇 |
现状与发展 | 8篇 |
一般理论 | 536篇 |
预防医学 | 126602篇 |
眼科学 | 41965篇 |
药学 | 137021篇 |
4篇 | |
中国医学 | 3959篇 |
肿瘤学 | 99524篇 |
出版年
2018年 | 16645篇 |
2016年 | 14747篇 |
2015年 | 16466篇 |
2014年 | 22740篇 |
2013年 | 34359篇 |
2012年 | 46504篇 |
2011年 | 50186篇 |
2010年 | 29456篇 |
2009年 | 27824篇 |
2008年 | 47325篇 |
2007年 | 52076篇 |
2006年 | 52128篇 |
2005年 | 50400篇 |
2004年 | 49123篇 |
2003年 | 47526篇 |
2002年 | 46631篇 |
2001年 | 82323篇 |
2000年 | 84491篇 |
1999年 | 71144篇 |
1998年 | 19191篇 |
1997年 | 17151篇 |
1996年 | 16651篇 |
1995年 | 15698篇 |
1994年 | 14565篇 |
1992年 | 55087篇 |
1991年 | 55240篇 |
1990年 | 54601篇 |
1989年 | 53454篇 |
1988年 | 49563篇 |
1987年 | 49060篇 |
1986年 | 46595篇 |
1985年 | 44441篇 |
1984年 | 33068篇 |
1983年 | 28079篇 |
1982年 | 16298篇 |
1981年 | 14887篇 |
1979年 | 31880篇 |
1978年 | 22783篇 |
1977年 | 19381篇 |
1976年 | 18310篇 |
1975年 | 21191篇 |
1974年 | 24767篇 |
1973年 | 24000篇 |
1972年 | 22811篇 |
1971年 | 21463篇 |
1970年 | 20288篇 |
1969年 | 19369篇 |
1968年 | 18174篇 |
1967年 | 16289篇 |
1966年 | 14893篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
992.
993.
994.
995.
996.
A modified technique for the repair of moderate to severe cicatricial entropion has been developed. This method is unique, as it involves the creation of a bipedicled tarsoconjunctival advancement flap. The technique avoids the causes of surgical failure seen with standard tarsal fracturing procedures. 相似文献
997.
A new technique for ultrasonic examination of the hip joint was evaluated in neonatals and infants. An anterior approach was used with the sound sector centered over the femoral head and parallel to the femoral neck. The ultrasonograms corresponded to lateral radiographs of the joint with the leg in Lorenz' first position. It was possible to evaluate the size and depth of the acetabulum and the size and position of the femoral head. The projection also permitted a dynamic examination for determination of hip instability. Thus, the technique provided a method for an objective diagnosis in congenital dislocation of the hip (CDH). In 216 hips, the results of clinical evaluation for CDH were correlated with the degree of instability demonstrated by ultrasound. The comparison showed the clinical diagnosis to be highly inaccurate. 相似文献
998.
999.
1000.
Rapid desensitization of the acute stimulatory effects of nicotine on rat plasma adrenocorticotropin and prolactin 总被引:5,自引:0,他引:5
The dose of nicotine and the frequency of its administration appear to be essential determinants of its action on multiple systems including the neuroendocrine regulation of the adrenocorticotropin (ACTH)-corticosterone and prolactin (PRL) axes in the rat. Because desensitization to the acute depressive effects of nicotine has been observed after both acute and chronic administration, these investigations assessed whether desensitization to the stimulative effects of nicotine on ACTH and PRL secretion occurs with repetitive dosing. Extensive dose and time course experiments showed that nicotine rapidly elevates rat plasma ACTH and PRL levels with a threshold dose between 0.1 to 0.25 mg/kg b.wt. i.p. After the stimulation of PRL, levels became significantly depressed. Desensitization to the acute stimulatory effects of nicotine on both hormones was induced by a single dose of nicotine (0.5 mg/kg). One hour later nicotine (1.0 mg/kg) failed to significantly stimulate PRL levels and resulted in a modest increase of ACTH. Desensitization was maximal by 1 hr after the first dose and persisted for at least 6 hr. Adrenalectomy, performed to eliminate corticosterone-induced negative feedback, did not enhance PRL responsiveness to a second dose of nicotine but it partially restored the ACTH response. Pretreatment with corticosterone also failed to modify the PRL response to a single dose of nicotine whereas it partially suppressed the ACTH response. Rapid desensitization to the acute stimulatory effects of nicotine on plasma PRL is independent of glucocorticoid negative-feedback whereas desensitization of the ACTH response is modestly dependent. 相似文献