全文获取类型
收费全文 | 1447篇 |
免费 | 94篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 48篇 |
妇产科学 | 21篇 |
基础医学 | 96篇 |
口腔科学 | 19篇 |
临床医学 | 159篇 |
内科学 | 456篇 |
皮肤病学 | 228篇 |
神经病学 | 77篇 |
特种医学 | 103篇 |
外科学 | 100篇 |
综合类 | 15篇 |
预防医学 | 139篇 |
药学 | 67篇 |
肿瘤学 | 31篇 |
出版年
2017年 | 12篇 |
2016年 | 31篇 |
2015年 | 36篇 |
2014年 | 35篇 |
2013年 | 64篇 |
2012年 | 14篇 |
2011年 | 18篇 |
2010年 | 35篇 |
2009年 | 55篇 |
2008年 | 17篇 |
2007年 | 20篇 |
2006年 | 29篇 |
2005年 | 13篇 |
2004年 | 19篇 |
2003年 | 17篇 |
2002年 | 14篇 |
2001年 | 11篇 |
2000年 | 29篇 |
1999年 | 43篇 |
1998年 | 68篇 |
1997年 | 55篇 |
1996年 | 61篇 |
1995年 | 51篇 |
1994年 | 56篇 |
1993年 | 38篇 |
1992年 | 61篇 |
1991年 | 18篇 |
1990年 | 44篇 |
1989年 | 44篇 |
1988年 | 60篇 |
1987年 | 40篇 |
1986年 | 36篇 |
1985年 | 18篇 |
1984年 | 37篇 |
1983年 | 19篇 |
1982年 | 23篇 |
1981年 | 25篇 |
1980年 | 24篇 |
1978年 | 13篇 |
1977年 | 10篇 |
1976年 | 15篇 |
1975年 | 10篇 |
1973年 | 13篇 |
1972年 | 16篇 |
1971年 | 13篇 |
1970年 | 9篇 |
1968年 | 12篇 |
1967年 | 12篇 |
1966年 | 11篇 |
1964年 | 14篇 |
排序方式: 共有1563条查询结果,搜索用时 31 毫秒
41.
42.
43.
Marshall Hagins PT PhD Andrew Rundle PH Nathan S. Consedine PhD Sat Bir S. Khalsa PhD 《Journal of clinical hypertension (Greenwich, Conn.)》2014,16(1):54-62
The purpose of this study was to compare the effects of yoga with an active control (nonaerobic exercise) in individuals with prehypertension and stage 1 hypertension. A randomized clinical trial was performed using two arms: (1) yoga and (2) active control. Primary outcomes were 24‐hour day and night ambulatory systolic and diastolic blood pressures. Within‐group and between‐group analyses were performed using paired t tests and repeated‐measures analysis of variance (time × group), respectively. Eighty‐four participants enrolled, with 68 participants completing the trial. Within‐group analyses found 24‐hour diastolic, night diastolic, and mean arterial pressure all significantly reduced in the yoga group (?3.93, ?4.7, ?4.23 mm Hg, respectively) but no significant within‐group changes in the active control group. Direct comparisons of the yoga intervention with the control group found a single blood pressure variable (diastolic night) to be significantly different (P=.038). This study has demonstrated that a yoga intervention can lower blood pressure in patients with mild hypertension. Although this study was not adequately powered to show between‐group differences, the size of the yoga‐induced blood pressure reduction appears to justify performing a definitive trial of this intervention to test whether it can provide meaningful therapeutic value for the management of hypertension. 相似文献
44.
45.
HICHEM BELHADJALI PH.D. HAYET AKKARI M.D. MONIA YOUSSEF M.D. MARIEM MOHAMED M.D. JAMELEDDINE ZILI PH.D. 《Pediatric dermatology》2011,28(5):580-581
Abstract: Natural henna is known to have a very low allergic potential. We describe here an exceptional case of bullous contact dermatitis caused by pure henna. 相似文献
46.
47.
MAGDALENA BUDISTEANU M.D. PH.D. AURORA ARGHIR M.D. PH.D. SORINA MIHAELA CHIRIEAC ING. GEORGETA CARDOS PH.D. AGRIPINA LUNGEANU PH.D. 《Pediatric dermatology》2010,27(2):212-214
Abstract: We present a case of oculocutaneous albinism in a child associating multiple malformations (preaxial polydactyly, small penis, cardiac malformation) and psychomotor retardation. To our knowledge, this association has not been previously described. 相似文献
48.
49.
Cytogenetic and histologic correlations in malignant lymphoma 总被引:9,自引:0,他引:9
Koduru PR; Filippa DA; Richardson ME; Jhanwar SC; Chaganti SR; Koziner B; Clarkson BD; Lieberman PH; Chaganti RS 《Blood》1987,69(1):97-102
Although a number of studies have indicated correlations between histologic subtypes of tumors and certain nonrandom chromosome changes, cytogenetic studies of lymphoma are in an early stage compared to those of leukemia. No comprehensive analysis of available data has so far been attempted in the literature either. Here we present an analysis of chromosome changes and their correlation with subtypes of lymphoma studied by conventional histology and cell surface markers, as observed in two sets of data: a group of 65 karyotypically abnormal tumors sequentially ascertained and studied by us during the period January 1, 1984 to April 30, 1985, and a larger data set derived by combining our data with those from two published series from the University of Minnesota that are comparable to our data. These combined data, which comprise the largest data set on the cytogenetics of lymphomas assembled so far, enabled a comprehensive analysis of correlation between chromosome change and tumor histology and the patterns of chromosome instability in these tumors. We found several significant associations, some previously described and others now recognized, between nonrandom chromosome gains, breaks, translocations, and deletions and histologic subtypes of tumors that characterize lymphomas. The data indicate that finding of chromosome breaks at certain sites (eg, 8q24, 14q32, 18q21) is of diagnostic value in dealing with cases of unusual lymphoma. Furthermore, nonrandom chromosome breakage exhibited three distinct patterns that reflected three levels of etiologically relevant genetic change. 相似文献
50.
关于空腹血糖、空腹胰岛素乘积的倒数在流行病学研究中应用的补充说明 总被引:26,自引:0,他引:26
高胰岛素正糖钳夹技术可以测定活体的胰岛素敏感性,但它并不适用于大规模流行病学研究。流行病学研究需要简单的胰岛素抵抗测定法。本文补充报告在空腹血糖(FPG)(75~306mg/dl或4.2~17.1mmol/L)及空腹胰岛素(FIns)(9.7~120mU/L)范围很宽的Pima印第安人群中,正糖钳夹技术测定的胰岛素介导的葡萄糖代谢率(M)与涉及FPG、FIns的多种复合的胰岛素敏感指数的相关性:胰岛素作用指数(IAI)=1/(FPG×FIns)在非糖尿病人群及2型糖尿病人群都与M显著正相关(r>0.7,P=0.0001),而且这两者的相关性强于M与其他指数如FIns或FPG/FIns比值的相关性,也不弱于M与糖负荷后3~5个时间点的血糖、胰岛素曲线下面积乘积的相关性。IAI的五分变量分布情况表明有90.4%的IAI落在所预测的M值五分变量区域或与之相邻的一个五分变量区域之内。1/FPG×FIns虽相对简单但确实与机体的胰岛素敏感性密切相关,它可以做为胰岛素敏感指数在流行病学研究中应用。 相似文献