首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2558759篇
  免费   195297篇
  国内免费   4171篇
耳鼻咽喉   36295篇
儿科学   85338篇
妇产科学   73904篇
基础医学   368333篇
口腔科学   74536篇
临床医学   223480篇
内科学   495810篇
皮肤病学   54621篇
神经病学   204029篇
特种医学   100927篇
外国民族医学   793篇
外科学   390670篇
综合类   59789篇
现状与发展   4篇
一般理论   808篇
预防医学   195590篇
眼科学   59639篇
药学   193852篇
  4篇
中国医学   4782篇
肿瘤学   135023篇
  2018年   23858篇
  2015年   23906篇
  2014年   32971篇
  2013年   50297篇
  2012年   68555篇
  2011年   72976篇
  2010年   43023篇
  2009年   40877篇
  2008年   70108篇
  2007年   74885篇
  2006年   76156篇
  2005年   74236篇
  2004年   72472篇
  2003年   69665篇
  2002年   68489篇
  2001年   115733篇
  2000年   119243篇
  1999年   101280篇
  1998年   28504篇
  1997年   25748篇
  1996年   25845篇
  1995年   24857篇
  1994年   23407篇
  1993年   21978篇
  1992年   83426篇
  1991年   81579篇
  1990年   80218篇
  1989年   77728篇
  1988年   72342篇
  1987年   71366篇
  1986年   67928篇
  1985年   65273篇
  1984年   48995篇
  1983年   42570篇
  1982年   25122篇
  1981年   22317篇
  1980年   21038篇
  1979年   46969篇
  1978年   32861篇
  1977年   27990篇
  1976年   26482篇
  1975年   28411篇
  1974年   34202篇
  1973年   33010篇
  1972年   30911篇
  1971年   28869篇
  1970年   26753篇
  1969年   25303篇
  1968年   23445篇
  1967年   21015篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
ABSTRACT

Objectives: The present study investigated the relationships of enculturation and depressive symptoms with health risk behavior engagement in Mexican-American college students and examined how these relationships differed by gender. Previous research has noted consistent gender differences in health risk behavior (e.g. alcohol use, substance use, and risky sexual behavior) among Latina/os, and emphasized the role of U.S. acculturation in this difference. Research examining the role of heritage cultural retention (i.e. enculturation), and including the added influence of mental health variables, such as depressive symptoms, is currently lacking. This study sought to address this gap.

Design: A large sample (N?=?677) of Mexican-American college students from four universities (located in New York, California, Florida, and Texas) completed an online questionnaire assessing health risk behaviors and corresponding variables.

Results: We found that males who endorsed more behavioral enculturation and depressive symptoms were more likely to engage in health risk behavior than all others in the sample. Contrary to previous literature, no relationship was found between behavioral enculturation and health risk behavior in females.

Conclusion: The current study found behavioral enculturation to be associated with depressive symptoms, and in turn with health risk behaviors among the males in our sample. Additional research will be needed to identify the mechanism underlying the relationship between enculturation and depressive symptoms as well as between depressive symptoms and risky behavior.  相似文献   
103.
Abstract

This study is a single-center, retrospective analysis of postmenopausal women presenting with dyspareunia and vulvar pain, aiming to evaluate relative effectiveness of vestibular CO2 laser therapy as a treatment. Three monthly sessions of laser were performed to each patient and thereafter a three-months follow-up was stablished. A total number of 72 patients undergoing vestibular laser treatment were recruited from patient files in the period between 2016 and 2018. Among these, 39 women also received a concomitant treatment with ospemifene (60?mg/day) during the study period. There was a statistically significant reduction of all the symptoms in both groups up to the three month follow-up. Regarding dryness and dyspareunia, the relief tent to be more prominent in the ospemifene?+?laser group at all follow-ups and remained statistically significant at three-month follow-up. Specifically, vestibular dryness was significantly lower in the ospemifene?+?laser group compared with the laser treatment group (?87% vs???34%, respectively), and the vestibular health score started declining faster in the ospemifene?+?laser group. Although, additional research is needed to understand the mechanism of action, our data shows that a combination regimen of laser and ospemifene may improve clinical effectiveness for long-term treatment of symptoms associated with the under-recognized genitourinary syndrome of menopause.  相似文献   
104.
105.
106.
Women with pre-eclampsia have an increased risk of cardiovascular disease later in life. The aim of the study was to establish the presence and pattern of arterial stiffness in women previously with pre-eclampsia from a semi-rural region of South Africa. This was a prospective longitudinal study which involved 36 previously pre-eclamptic women and 86 non-pregnant controls (NPC) who had a past history of non-complicated pregnancy. Maternal wave reflection (augmentation index) and carotid-femoral pulse wave velocity were assessed noninvasively, using applanation tonometry with the SphygmoCor device. Endothelial function was assessed by EndoPAT 2000 device; pneumatic probes were fitted to the index fingers; induced flow-mediated reactive hyperemia; the ratio of the readings before and after occlusion was then used to calculate the score, the reactive hyperemia index (RHI) as a measure of endothelial function.

Pulse wave velocity remained significantly higher in previously pre-eclamptic women than non-pregnant controls up to three months after delivery (p < 0.05), then it reduced to nonsignificant values. All blood pressure indices (central and brachial pressures), were higher in previously pre-eclamptic women as compared to nonpregnant controls up to one year postpartum.

Regional (aortic) arterial stiffness, though it persists for some time after delivery, is transitory in previously pre-eclamptic women from the rural Africa setting. However, their increase blood pressure is an indication of compromised arterial compliance in women previously with pre-eclampsia.  相似文献   

107.
108.
109.
110.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号