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   475828篇
  免费   33035篇
  国内免费   8619篇
耳鼻咽喉   6223篇
儿科学   9651篇
妇产科学   12136篇
基础医学   64500篇
口腔科学   13530篇
临床医学   43433篇
内科学   93333篇
皮肤病学   9331篇
神经病学   32483篇
特种医学   17166篇
外国民族医学   124篇
外科学   70865篇
综合类   24216篇
现状与发展   24篇
一般理论   83篇
预防医学   23117篇
眼科学   12208篇
药学   41082篇
  57篇
中国医学   6940篇
肿瘤学   36980篇
  2022年   4254篇
  2021年   7410篇
  2020年   5076篇
  2019年   5846篇
  2018年   7888篇
  2017年   6247篇
  2016年   6251篇
  2015年   8235篇
  2014年   11090篇
  2013年   12147篇
  2012年   17272篇
  2011年   18213篇
  2010年   10993篇
  2009年   9512篇
  2008年   14511篇
  2007年   15552篇
  2006年   15374篇
  2005年   14780篇
  2004年   12471篇
  2003年   11779篇
  2002年   11074篇
  2001年   30106篇
  2000年   30844篇
  1999年   25921篇
  1998年   6610篇
  1997年   5641篇
  1996年   5087篇
  1995年   4598篇
  1994年   4047篇
  1993年   3447篇
  1992年   16823篇
  1991年   15446篇
  1990年   14705篇
  1989年   14433篇
  1988年   13023篇
  1987年   12422篇
  1986年   11403篇
  1985年   10549篇
  1984年   7062篇
  1983年   5718篇
  1982年   2783篇
  1979年   5571篇
  1978年   3388篇
  1977年   3015篇
  1975年   2678篇
  1974年   3102篇
  1973年   2892篇
  1972年   2859篇
  1971年   2803篇
  1969年   2566篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
OBJECTIVE: The aim of this study was to examine the dental condition and oral manifestations in diabetic and nondiabetic uremic patients undergoing hemodialysis. STUDY DESIGN: A total of 128 patients undergoing hemodialysis therapy were classified into the diabetic and nondiabetic groups and examined for uremic oral manifestations, dental caries, and the periodontal status. All the patients received predialytic salivary pH examination. In the diabetic group, the correlation between oral findings and glycemic controlled levels, which was collected based on Hb A1C values, were further studied. RESULTS: The diabetic group exhibited significantly higher prevalence of caries and more severe dry mouth, taste change, and mucosa pain than the nondiabetic group. The diabetic group tended to have lower predialytic salivary pH, and patients with poor glycemic control (ie, Hb A1C > 9%) showed higher incidence of dry mouth, mucosal pain, and tongue coating. However, the DMFT and CPI index were not associated with glycemic control in the diabetic group. CONCLUSIONS: This study reveals that diabetic uremic patients undergoing maintained hemodialysis exhibited a potentially higher risk for dental decay and xerostomia. Lower salivary pH and poor glycemic control may affect oral manifestations. Further research is needed to clarify the combined influence of diabetic nephropathy on oral health.  相似文献   
972.
Objective: To observe the therapeutic effect of external application of Chinese drugs on acupoint Shenque (CV 8) combined with salpingostomy for treatment of sterility caused by obstruction of the fallopian tube. Method: 75 cases were randomly divided into the following 2 groups. Forty-five patients in the treatment group were treated with external application of Chinese drugs on acupoint Sbenque (CV 8) combined with salpingostomy, while 30 patients in the control group were treated with salpingostomy only. Results: The results showed that in the treatment group, 26 cases were cured, 11 cases improved, and 8 cases failed, with a total effective rate of 82.22%; while in the control group, 14 cases were cured, 7 cases improved, and 9 cases failed, with a total effective rate of 70.00%. There is a significant difference in the total effective rate between the two groups (P〈0.05). Conclusion: The therapeutic effect of external application of Chinese drugs on acupoint Shenque combined with salpingostomy is better than that of salpingostomy only.  相似文献   
973.
The principal goal of the current study was to compare the efficacy of two treatment formats, group and individual, of an empirically proven manualized cognitive–behavioural treatment (CBT) package, for obsessions without overt compulsions. It was hypothesized that individualized treatment would be more effective both in terms of post-treatment group mean improvement and end state functioning. A secondary goal was to assess the relationship between cognitive and behavioural change during treatment and link it to symptom change. Both group and individual CBT format produced a significant clinical change, but as expected individual treatment produced the greater change in symptoms and in obsessional belief. Also, the individual format showed a clear superiority over the group format in the reduction of anxiety and depression. Severity of OCD symptoms showed little relationship with strength of obsessional beliefs at the start of treatment, but change in beliefs was strongly correlated with behavioural improvement post-treatment. The results of the study suggest that the impact of a group format may lie in the value of shared social support and motivational effect of peer feedback, but at the expense of individualized targets. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   
974.
目的 探讨MRI诊断子宫腺肌病的价值.方法 回顾性分析6例子宫腺肌病患者MRI和超声检查的资料,与术后病理结果对比,评估MRI对子宫腺肌病的诊断符合率.结果 B超诊断子宫腺肌病的灵敏度为52.5%、特异度为54.2%;MRI灵敏度为95.6%、特异度为100%;MRI检查既能定性,又能定位,而且此检查无创伤,方便快捷.结论 MRI为临床诊断子宫腺肌病提供了一种有价值的检查方法,对及时、正确治疗该病具有重要的临床意义.  相似文献   
975.
976.
A study of some antiparasitic properties of several homoallylamines and related tetrahydroquinolines and quinolines, previously described, was carried out using in vitro activity assays against the epimastigote form of Trypanosoma cruzi and against Trichomonas vaginalis. Unspecific cytotoxicity against murine macrophages was also studied. Although the antichagasic and trichomonacidal activities are not comparable to those of the standard drugs, nifurtimox and metronidazole, some of the compounds exhibit an interesting specific antiparasitic activity.  相似文献   
977.
978.
Abstract:  Angiotensin-converting enzyme inhibitor (ACEI) has become recognized as agents that have renoprotective effects in the treatment of progressive renal diseases including post-transplant kidneys. Previously we demonstrated the safety and effectiveness of ACEI treatment on the hypertensive proteinuric post-transplant patients ( N  = 10) who had been followed up for 12 months. However, not all patients show good response in urinary protein reduction. We aimed to analyse the histopathological factor(s) affecting the responsiveness of proteinuria to ACEI treatment. Fourteen post-transplant patients with proteinuria who were treated with ACEI and underwent allograft biopsy were analysed. Eight patients showed 50% or more reduction in proteinuria (responder). The other 6 patients showed less (< 50%) reduction in proteinuria (non-responder). There was no difference in clinical characteristics (BP, renal function, donor age, recipient body mass index), dietary sodium or protein intake, and diuretic use between the two groups. As a histopathological characteristic, glomerular size in responder group was significantly larger than that in non-responder group. This suggests that the large glomerular size at least partly contributes to the responsiveness in urinary protein reduction to ACEI treatment in kidney allograft recipients with proteinuria.  相似文献   
979.
980.
We report one patient with cardiofaciocutaneous (CFC) syndrome. He presented with clinical findings characteristic of this condition such as: cutaneous abnormalities, including ichthyosis, widespread keratosis pilaris, a peculiar craniofacial appearance with sparse, curly hair and low-set posteriorly rotated ears; congenital heart defects; and mild mental and motor retardation. We submit a comprehensive review of previously published articles regarding the dermatological findings in CFC syndrome (recently shown to be a variant of Noonan syndrome) emphasizing diagnostic criteria and its differentiation from the Costello syndrome.  相似文献   
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