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   1843212篇
  免费   131621篇
  国内免费   3155篇
耳鼻咽喉   25941篇
儿科学   61270篇
妇产科学   52211篇
基础医学   273014篇
口腔科学   52092篇
临床医学   160176篇
内科学   357480篇
皮肤病学   39766篇
神经病学   139347篇
特种医学   70689篇
外国民族医学   429篇
外科学   281644篇
综合类   39070篇
现状与发展   3篇
一般理论   436篇
预防医学   135058篇
眼科学   42542篇
药学   140350篇
  4篇
中国医学   4501篇
肿瘤学   101965篇
  2018年   18153篇
  2016年   15573篇
  2015年   17743篇
  2014年   24449篇
  2013年   37031篇
  2012年   50172篇
  2011年   53340篇
  2010年   31534篇
  2009年   29681篇
  2008年   50973篇
  2007年   54958篇
  2006年   56043篇
  2005年   53956篇
  2004年   52341篇
  2003年   50527篇
  2002年   49449篇
  2001年   86467篇
  2000年   88483篇
  1999年   74391篇
  1998年   20632篇
  1997年   18138篇
  1996年   18560篇
  1995年   17526篇
  1994年   16590篇
  1993年   15243篇
  1992年   59230篇
  1991年   58318篇
  1990年   57344篇
  1989年   56123篇
  1988年   52065篇
  1987年   50639篇
  1986年   48356篇
  1985年   45875篇
  1984年   34117篇
  1983年   29399篇
  1982年   17060篇
  1981年   15126篇
  1979年   31904篇
  1978年   22405篇
  1977年   19327篇
  1976年   18265篇
  1975年   20110篇
  1974年   23666篇
  1973年   22737篇
  1972年   21552篇
  1971年   20116篇
  1970年   18985篇
  1969年   18018篇
  1968年   16832篇
  1967年   14845篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
Atherosclerotic renal artery stenosis (ARAS) may cause hypertension, progressive renal failure, and recurrent pulmonary edema. It typically occurs in high risk patients with coexistent vascular disease elsewhere. Most patients with ARAS are likely to die from coronary heart disease or stroke before end-stage renal failure occurs. Recent controlled trials have shown that most patients undergoing angioplasty to treat renovascular hypertension still need antihypertensive agents 6 or 12 months after the procedure. Nevertheless, the number of antihypertensive agents required to control blood pressure adequately is lower following angioplasty than for medication alone. Trials assessing the value of revascularization for preserving renal function or preventing clinical events are only in the early recruitment phase. Revascularization should be undertaken in patients with ARAS and resistant hypertension or heart failure, and probably in those with rapidly deteriorating renal function or with an increase in plasma creatinine levels during angiotensin-converting enzyme inhibition. With or without revascularization, medical therapy using antihypertensive, hypolipidemic and antiplatelet agents is necessary in almost all cases.  相似文献   
83.
Is atrial fibrillation an inflammatory disorder?   总被引:2,自引:0,他引:2  
I read with great interest the excellent review on the influenceof inflammation in the pathogenesis of atrial fibrillation (AF)by Boos   相似文献   
84.
85.
86.
87.
OBJECTIVES: To identify and describe current women's thoughts about the menopause, hormone treatment (HT) and perceptions about breast cancer. METHODS: Between December 2004 and January 2005, 4201 postmenopausal women in seven European countries were interviewed via a standardized computer-aided telephone interview protocol. RESULTS: Almost all women reported to have experienced climacteric symptoms, and 63% of the women rated them as being severe. Only 52% of women were aware of the benefits of HT for relief of climacteric symptoms. Although 84% felt that severe symptoms should be treated, only 40% had used HT at some point in time. Thirty-four percent of the women preferring treatment with natural products did so because of the risk of breast cancer associated with HT. HT was recognized by 59% of the women as one of the most important contributors to an increased breast cancer risk. Most women received their information about HT and breast cancer risk from the media. CONCLUSIONS: This European survey reveals that the majority of women experience climacteric symptoms but that their decision whether or not to use HT is highly dependent on their concern about breast cancer risk. An increase in knowledge of the benefits and risks of HT is required for women to make appropriate decisions about hormone use.  相似文献   
88.
89.
BACKGROUND: Arterial hypertension and postmenopausal reduction of estrogen levels may be involved in modifications of the stiffness of large arteries. OBJECTIVES: To evaluate the pulse-wave velocity (PWV) and indirectly the arterial stiffness in hypertensive postmenopausal women submitted to hormone therapy with estradiol alone or combined with norethisterone acetate. SUBJECTS: Forty-five hypertensive postmenopausal women were double-blindly, randomly assigned to three arms of treatment: placebo (group I); estradiol 2 mg/day (group II); or estradiol 2 mg/day and norethisterone acetate 1 mg/day (group III). METHODS: Arterial stiffness was assessed from PWV measurements of the common carotid and femoral arteries (CF-PWV) and the common carotid and radial arteries (CR-PWV) obtained using the automatic Complior(R) device, taken at baseline and after 12 weeks of treatment. RESULTS: After the 12-week treatment, values of CF-PWV and CR-PWV were not significantly different (p = 0.910 and p = 0.736, respectively) among the groups. Systolic blood pressure showed a positive correlation with CF-PWV in groups II and III (p = 0.02 and p < 0.001, respectively). CONCLUSIONS: PWV and arterial stiffness in postmenopausal hypertensive women did not reduce over a 12-week treatment with estradiol alone compared with the same period of treatment with estradiol combined with norethisterone acetate.  相似文献   
90.
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