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   3671篇
  免费   249篇
  国内免费   17篇
耳鼻咽喉   57篇
儿科学   131篇
妇产科学   137篇
基础医学   579篇
口腔科学   113篇
临床医学   327篇
内科学   826篇
皮肤病学   48篇
神经病学   333篇
特种医学   74篇
外科学   406篇
综合类   14篇
现状与发展   1篇
一般理论   3篇
预防医学   345篇
眼科学   20篇
药学   259篇
中国医学   15篇
肿瘤学   249篇
  2023年   37篇
  2022年   66篇
  2021年   182篇
  2020年   78篇
  2019年   143篇
  2018年   138篇
  2017年   97篇
  2016年   117篇
  2015年   128篇
  2014年   156篇
  2013年   182篇
  2012年   315篇
  2011年   314篇
  2010年   154篇
  2009年   131篇
  2008年   218篇
  2007年   218篇
  2006年   211篇
  2005年   197篇
  2004年   172篇
  2003年   153篇
  2002年   139篇
  2001年   47篇
  2000年   36篇
  1999年   31篇
  1998年   15篇
  1997年   14篇
  1996年   9篇
  1995年   11篇
  1994年   7篇
  1993年   9篇
  1992年   13篇
  1991年   13篇
  1989年   8篇
  1988年   11篇
  1987年   10篇
  1986年   15篇
  1985年   9篇
  1984年   9篇
  1983年   10篇
  1982年   5篇
  1981年   9篇
  1980年   8篇
  1979年   10篇
  1976年   6篇
  1974年   5篇
  1973年   8篇
  1972年   10篇
  1969年   5篇
  1966年   5篇
排序方式: 共有3937条查询结果,搜索用时 31 毫秒
1.
2.
3.
The purpose of this study was to identify perceived barriers to independent community living and employment among clients and staff members in a transitional living facility for persons with AIDS. This qualitative study used focus groups to collect these perceptions from staff members (N = 21) and clients (N = 16). Whereas staff identified both systemic and personal barriers, clients only identified systemic barriers. These findings suggest that both clients and staff recognize the types of environmental barriers to participation that have been identified by disability scholars. The findings also underscore a consequential gap between clients' exclusive emphasis on environmental barriers and staff emphasis on clients' personal barriers that impact upon participation.  相似文献   
4.
The value of a long-term treatment with clonazepam in the prophylaxis of affective disorder is discussed controversially in the scientific literature. Altogether there are only a few reports on the use of this compound as a mood stabilizer, most of them describing patients suffering from bipolar affective disorder. The aim of this investigation was to evaluate clonazepam as a phase prophylactic medication in affective disorder. We conducted a retrospective chart review in 34 out-patients of our lithium clinic (15 suffering from unipolar depression, 15 from bipolar disorder, four from schizoaffective disorder), who had been treated with clonazepam as a long-term medication. Clonazepam was either given as monotherapy, or as in the case of lithium non-responders, as adjunctive therapy. Patients with unipolar depression had significantly (P=0.026) less depressive episodes after initiation of treatment with clonazepam. Patients with bipolar disorder did not benefit from this therapy. Neither manic/hypomanic phases nor depressive episodes were reduced in this group of patients. Interestingly, clonazepam also reduced affective phases in our four schizoaffective patients on a trend level. Our results indicate that patients with unipolar depression may benefit from a maintenance treatment with clonazepam. Due to methodological limitations our results need to be replicated in controlled double-blind randomized clinical trials.  相似文献   
5.
Two new T cell subsets may be involved in allergic rhinitis (AR) pathogenesis: Th17 and T regulatory cells, mainly producing IL-17 and TGF-β respectively. Successful Sublingual Immunotherapy (SLIT) induces relevant immunological changes, thus the aim of this study was to evaluate serum IL-17 and TGF-β levels in AR patients treated with SLIT for 2 years. Patients' blood samples were collected before initiating SLIT (baseline), three months after the end of the first pre-seasonal SLIT course, and at the end of the second pre-seasonal course. IL-17 was detectable only in the most severe allergic patients. SLIT significantly induced an increase in serum TGF-β levels. There was moreover a significant relationship between TGF-β and symptom severity and drug use at the end of the study. Therefore, this study provides clinically relevant evidence that two pre-seasonal SLIT courses may significantly affect serum TGF-β levels.  相似文献   
6.
7.
Retrospective review of the abdominal ultrasound (US) examination of 274 children studied for hypertrophic pyloric stenosis (HPS) was undertaken to determine if there is an increased incidence of renal disease as previously reported. Five major abnormalities were detected in the 126 children with HPS. Three lesions were newly diagnosed and two had been diagnosed previously. Five children had abnormalities classified as minor or normal variants. Renal abnormalities were found in six of the 148 children who did not HPS. Only three of these were newly diagnosed and medically important. Eight children without HPS had minor abnormalities or normal variants of the kidneys. Newly diagnosed medically important renal lesions were present in 2.4% of children screened for HPS. The incidence of the finding was the similar in children with and without HPS.Paper presented at 1992 RSNA meeting  相似文献   
8.
We present 5 patients with cyanotic congenital heart disease in whom a pulmonary valvuloplasty was performed as palliative therapy. The patients symptoms were hypoxemic spells, very low oxygen saturation and no weight gain. The oxygenation improved and symptoms disappeared. We believe that in properly selected patients this technique represents a good therapeutic modality.  相似文献   
9.
OBJECTIVE: To describe pelvic sonographic findings in girls as old as 7 years, to compare prepubertal girls with girls who had isolated thelarche or central precocious puberty, and to verify the accuracy of sonographic variables for distinguishing prepubertal girls from girls with central precocious puberty. METHODS: Ninety-six prepubertal girls and 2 reference groups (8 girls with isolated thelarche and 8 with idiopathic central precocious puberty) were included. Ovaries were classified morphologically as homogeneous, paucicystic, macrocystic, multicystic, and having isolated cysts. Receiver operating characteristic curves were used to choose the best cutoff points. RESULTS: Chronologic and bone age were correlated with uterine length, area, and volume and ovarian volume in prepubertal girls (P < .0001). Ovarian morphologic characteristics in prepubertal girls differed significantly from those of the reference groups (P < .0001). The best cutoff points were uterine length of 4.0 cm, uterine area of 4.5 cm2, uterine volume of 3.0 cm3, and ovarian volume of 1.0 cm3. CONCLUSIONS: Uterine and ovarian growth are proportional to age in prepubertal girls. Mean ovarian volume greater than 1 cm3 showed 100% sensitivity and specificity for discriminating between prepubertal girls and girls with central precocious puberty. Microcysts are common in prepubertal girls, but the presence of 6 or more follicles up to 10 mm in diameter may suggest central precocious puberty in girls younger than 8 years.  相似文献   
10.
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