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   1660篇
  免费   71篇
  国内免费   7篇
耳鼻咽喉   17篇
儿科学   253篇
妇产科学   67篇
基础医学   121篇
口腔科学   82篇
临床医学   131篇
内科学   384篇
皮肤病学   31篇
神经病学   144篇
特种医学   47篇
外科学   238篇
综合类   16篇
预防医学   37篇
眼科学   75篇
药学   42篇
中国医学   6篇
肿瘤学   47篇
  2023年   11篇
  2022年   25篇
  2021年   43篇
  2020年   25篇
  2019年   39篇
  2018年   40篇
  2017年   41篇
  2016年   49篇
  2015年   46篇
  2014年   49篇
  2013年   98篇
  2012年   135篇
  2011年   129篇
  2010年   63篇
  2009年   60篇
  2008年   118篇
  2007年   123篇
  2006年   111篇
  2005年   110篇
  2004年   86篇
  2003年   70篇
  2002年   74篇
  2001年   25篇
  2000年   21篇
  1999年   22篇
  1998年   9篇
  1997年   10篇
  1996年   7篇
  1995年   9篇
  1994年   2篇
  1993年   7篇
  1992年   8篇
  1991年   9篇
  1990年   8篇
  1989年   10篇
  1988年   3篇
  1987年   3篇
  1986年   5篇
  1985年   5篇
  1982年   3篇
  1981年   4篇
  1980年   2篇
  1979年   2篇
  1977年   1篇
  1976年   3篇
  1975年   3篇
  1973年   3篇
  1971年   3篇
  1968年   1篇
  1966年   2篇
排序方式: 共有1738条查询结果,搜索用时 15 毫秒
71.
A series of novel compounds have been designed that are potent inhibitors of poly(ADP-ribose) polymerase-1 (PARP-1), and the activity and physical properties have been characterized. The new structural classes, 3,4,5,6-tetrahydro-1H-azepino[5,4,3-cd]indol-6-ones and 3,4-dihydropyrrolo[4,3,2-de]isoquinolin-5-(1H)-ones, have conformationally locked benzamide cores that specifically interact with the PARP-1 protein. The compounds have been evaluated with in vitro cellular assays that measure the ability of the PARP-1 inhibitors to enhance the effect of cytotoxic agents against cancer cell lines.  相似文献   
72.
Recent technical improvements in cross-sectional echocardiography have made it possible to detect even mild organic regurgitation of the mitral and aortic valves in patients with acute rheumatic fever. To determine the prevalence and prognosis of subclinical valvitis, we have analyzed 104 patients with acute rheumatic fever referred to our institution. Of 53 patients who had no murmur, 22 of them with polyarthritis, 29 with chorea, and 2 with polyarthritis and chorea, 23 (43.4%) had subclinical valvitis. Isolated mitral regurgitation was the most common valvar lesion, seen in 82.6% of the patients. Isolated aortic regurgitation was detected in 4.4% of the cases, and combined mitral and aortic regurgitation in the remaining 13%. During follow-up, the degree of mitral regurgitation improved in 59.1%, decreased in 18.2%, and increased or remained unchanged in 22.7% according to the length of colour jet. According to criterions of velocity, mitral regurgitation improved in 86.4% of the patients, and increased or unchanged in the remaining 13.6%. Mitral regurgitation disappeared completely in 6 of the patients (27.3%) as judged according to both the length of colour jet and the velocity of regurgitation. Aortic regurgitation improved in all the patients with this problem, disappearing completely in two of the four. Based on this experience, we suggest that not only the disappearance of regurgitation, but also improvements in the echocardiographic diagnostic criterions of regurgitation, such as the length of the colour jet less than 1 cm, or velocity less than 2.5 m/s, or indicative of regurgitation that is either intermittent or of short duration, should also be considered as criterions indicating improvement in valvar regurgitation in patients with subclinical rheumatic valvitis.  相似文献   
73.
his report describes two patients with a known history of Beh?et's disease in whom massive hemoptysis developed from rupture of pulmonary artery aneurysms. The high recurrence rate of complications related to pulmonary artery aneurysms and even the aneurysms themselves due to inadequacy of medical therapy and the disadvantages of surgical treatment make these aneurysms candidates for endovascular management. The pulmonary artery aneurysms reported here were successfully treated with endovascular embolization using n-butyl cyanoacrylate. Pulmonary artery aneurysm embolization in Beh?et's disease has been reviewed in the light of relevant literature.  相似文献   
74.
We describe two siblings, products of a first cousin marriage, with diaphyseal dysplasia, severe anaemia, leukopenia, and thrombocytopenia. Radiologically, both had wide medullary cavities with discrete cortical hyperosthosis. Bone marrow was hypocellular. These, and six similar cases in the literature [6], suggest that they represent a form of diaphyseal dysplasia differing from Camurati-Engelmann disease by their radiological appearance, associated haematological abnormalities and autosomal recessive inheritance.  相似文献   
75.
76.
BACKGROUND: To evaluate the obesity status, factors and comorbidities related to it in three district municipalities (DM) that compose city center of Bursa with inhabitants of different socioeconomic status. METHODS: A total of 1632 inhabitants >/=18 years of age were interviewed. The number of sample in each DM was obtained proportional to their populations by stratified sampling method. Among 1632, a total of 1543 subjects were included by random sampling and a questionnaire was filled in including demographic, social and behavioral features. RESULTS: The participants living in DM with the highest socioeconomical status (SES) score and level of education had the lowest body mass index (BMI) and body fat percentage (%BF) compared to other DMs. The lowest obesity prevalence (30.8% vs. 36.4% and 39.3%) in that DM was possibly due to younger age, lower female ratio, more active professional, higher percentage of smoking, more consumption of vegetables, olive or corn oil, and less carbohydrate. For the evaluation of the factors that may influence obesity risk, we investigated the effects of these factors in men and women separately with logistic regression model. Sedentary life style and dyslipidemia (DL) in men, being unemployed, having lower level of education and having hypertension (HT) in women and familial obesity in both gender were found to be related to increased obesity risk. CONCLUSIONS: The prevalence of obesity in Bursa is increasing although inhabitants are taking some precautions parallel to their socioeconomical and educational levels. Obesity is becoming a more alarming public health problem in Bursa and Turkey like in most other parts of the world, which forces us to invent new prevention policies. Besides, the results of our study highlight the fact that especially female education requires more attention for decreasing obesity prevalence in coming generations.  相似文献   
77.
78.
Recently, fat injection has gained favor among plastic surgeons for soft tissue augmentation. However, fat injections lose 50% of their volume after 1 year. The profession is in need of an injectable bulking material that gives a long-lasting improvement. Using 30 male rats, this study investigated the stability of the size and structure of the injected fascia autograft and compared it with surgically transplanted fascia. The fascia graft was harvested from the back of the rat, big, and divided into two equal pieces. The first piece was minced into a paste and injected subcutaneously on the anterior surface of the right ear. The other piece was transplanted subcutaneously on the anterior surface of the left ear. The grafts were observed for any sign of resorption over 1 to 6 months.Grossly, injection and transplantation sites were palpable at the end of the observation periods. Microscopic examination showed that injected fascia maintains its histomorphologic structure.These findings indicate that the injected fascia graft is well tolerated, and the size of the graft remained stable. According to this study, fascia injection can result in bulking material that gives a long-lasting improvement, and can be a viable alternative to other methods.  相似文献   
79.
The aim of this study was to evaluate the effects of planned relaparotomy and to assess factors that may contribute to mortality in patients with moderate to severe secondary peritonitis. A total of 36 consecutive patients with an Acute Physiologic and Clinical Health Evaluation (APACHE) II score of >10 were enrolled the study for a 2-year period. The mean age of the patients was 56 years (17-92 years), and 23% of them were male. One-third of them had postoperative peritonitis; 152 scheduled operations were done, and the overall mortality rate was 36%. For patients whose septic source was in the upper gastrointestinal system, control of the source was more difficult (p = 0.004). Overall, 28 complications developed in 61% of the patients. Initial and second-day APACHE II scores were 14.5 (11-27) and 12.0 (9-25), respectively. The initial APACHE II score of survivors was lower than that of nonsurvivors [p = 0.0001, 95% confidence interval (CI) -9.5, -3.6]. Second-day APACHE II scores were not different (p = 0.19; 95% CI -3.79, 0.80). Striking end or lateral duodenal leaks were clearly associated with high mortality. It is found that the initial APACHE II score, the success of controlling the source, the occurrence of complications, and the type of illness are independent factors that may affect mortality. We concluded that staged abdominal repair should be used with caution in the treatment of lateral or end duodenal leaks. It is a good alternative to conventional laparotomy for moderate to severe forms of secondary peritonitis from other sources.The preliminary data of this study were presented at the Turkish Surgical Congress in Antalya, Turkey in 2002.  相似文献   
80.
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