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   92446篇
  免费   6020篇
  国内免费   720篇
耳鼻咽喉   1071篇
儿科学   2823篇
妇产科学   2284篇
基础医学   12510篇
口腔科学   2113篇
临床医学   7532篇
内科学   20242篇
皮肤病学   1954篇
神经病学   8597篇
特种医学   3634篇
外国民族医学   24篇
外科学   13052篇
综合类   1643篇
一般理论   47篇
预防医学   5332篇
眼科学   1473篇
药学   7587篇
  3篇
中国医学   508篇
肿瘤学   6757篇
  2022年   782篇
  2021年   1697篇
  2020年   1098篇
  2019年   1563篇
  2018年   1942篇
  2017年   1489篇
  2016年   1552篇
  2015年   1816篇
  2014年   2385篇
  2013年   3519篇
  2012年   4667篇
  2011年   4859篇
  2010年   3187篇
  2009年   2779篇
  2008年   4307篇
  2007年   4502篇
  2006年   4295篇
  2005年   4107篇
  2004年   4442篇
  2003年   4308篇
  2002年   4358篇
  2001年   3693篇
  2000年   3645篇
  1999年   2946篇
  1998年   1113篇
  1997年   868篇
  1996年   801篇
  1995年   774篇
  1994年   680篇
  1993年   659篇
  1992年   1766篇
  1991年   1745篇
  1990年   1484篇
  1989年   1431篇
  1988年   1317篇
  1987年   1174篇
  1986年   1162篇
  1985年   1029篇
  1984年   761篇
  1983年   694篇
  1982年   444篇
  1981年   380篇
  1979年   566篇
  1978年   415篇
  1977年   368篇
  1975年   427篇
  1974年   479篇
  1973年   461篇
  1972年   421篇
  1971年   392篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
81.
Information regarding breast feeding practices of 600 children below 3 years of age attending hospital OPDs and private clinics during 1984-85 were collected. 51.3% received breast milk within 24 hrs. of birth, mean duration of breast feeding being 6 months. 68% of Infants had been given prelacteal feeds. 34% children were exclusively breast fed till 1 month. Insufficient milk was an important reason for discontinuation before 6 months.  相似文献   
82.
83.
84.
85.
The main objective of this study was to examine the psychosocial stress model developed by Taylor and Aspinwall with emotional exhaustion as the outcome variable. Respondents, 409 men and 346 women, who had a paid job for at least 20 hours per week, completed questionnaires concerning demographic variables, personality, temperament, work pressure, workload, perceived social support, appraisal, coping, and emotional exhaustion. Structural equation analyses provided only partial support for the validity of the model. First, on theoretical and statistical grounds, one more path linking external resources to social support was added. Second, contrary to expectations, coping styles did not predict emotional exhaustion. To conclude, when coping is measured retrospectively, it does not add to our understanding of emotional exhaustion. It is suggested that future studies should be longitudinal and include objective measures of stressors and psychosocial health outcomes in addition to self‐reports. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   
86.
BACKGROUND: Neovascularisation at the sapheno-femoral junction (SFJ) ligation site in the groin may occur within one year after great saphenous vein (GSV) surgery. Several anatomical and prosthetic barrier techniques have been proposed to prevent this evolution. OBJECTIVE: A prospective study examined whether closing the cribriform fascia could reduce the incidence of postoperative neovascularisation in the groin. PATIENTS AND METHODS: Patients with primary varicose veins and incompetence at the level of the SFJ were included. After SFJ ligation in 235 limbs of 193 patients an anatomical barrier was constructed by closing the cribriform fascia. Postoperative duplex scanning was performed after 2 and 12 months. Results were compared with historical control groups in which either a silicone patch saphenoplasty or no barrier technique had been performed. RESULTS: After one year, 10 limbs had developed recurrent thigh varicose veins and duplex scan showed neovascularisation at the SFJ ligation site in 15 of 223 re-examined limbs (6.7%). This was comparable to the group of 191 limbs with silicone patch saphenoplasty (5.2%) (P=0.526) and superior to the group of 189 limbs without barrier (14.8%) (P<0.01). CONCLUSION: Interposition of an anatomical barrier by closing the cribriform fascia after SFJ ligation reduced ultrasound detected neovascularisation at the SFJ after one year. In primary varicose vein operations application of an anatomical barrier technique (without prosthetic patch) is an alternative option to prevent postoperative neovascularisation.  相似文献   
87.
Background: Postoperative pain mostly results from sensitization of afferent fibers at injury sites driving central sensitization. Recently, peripheral processes have gained attention as mechanisms of hyperalgesia, and prostaglandins are among highly sensitizing agents. To date, perioperative administration of a single local dose of nonsteroidal antiinflammatory drugs has shown inconclusive efficacy. Rather than a single bolus, the current study evaluates the postoperative analgesic effect of diclofenac continuous intrawound infusion after elective cesarean delivery.

Methods: Ninety-two parturients were randomly allocated to receive a 48-h continuous intrawound infusion with 240 ml containing 300 mg diclofenac, 0.2% ropivacaine, or saline. In the ropivacaine and saline groups, patients also received 75 mg intravenous diclofenac every 12 h for 48 h. Postoperative evaluation included intravenous morphine consumption by patient-controlled analgesia and visual analog pain scores. Punctate mechanical hyperalgesia surrounding the wound and presence of residual pain after 1 and 6 months were also assessed.

Results: Continuous diclofenac infusion significantly reduced postoperative morphine consumption (18 mg; 95% confidence interval, 12.7-22.2) in comparison with saline infusion and systemic diclofenac (38 mg; 95% confidence interval, 28.8-43.7) (P = 0.0009) without unique adverse effects. Postoperative analgesia produced by local diclofenac infusion was as effective as local ropivacaine infusion with systemic diclofenac.  相似文献   

88.
89.
The aim of the present study was to assess retrospectively the additional value of positron emission tomography (PET)/computed tomography (CT) in the detection of unexpected extrapulmonary lesions in the staging of patients with a malignant pulmonary lesion in comparison with CT and PET used alone. A total of 217 patients with a pathologically proven lung tumour underwent PET/CT. CT, PET and PET/CT were evaluated in the detection of extrapulmonary lesions. These abnormalities were compared with the final diagnosis obtained from the medical records and statistical analysis was carried out. In total, 108 lesions were clinically detected. PET/CT showed a sensitivity, specificity, positive and negative predictive values and accuracy of 100, 81, 71, 100 and 87%, respectively, for the detection of extrapulmonary lesions and 92, 98, 89, 98 and 97%, respectively, for the detection of malignant extrapulmonary lesions. PET/CT was significantly better than CT and PET used alone. Conventional staging work-up has a poor sensitivity in detecting second primary cancers or unexpected metastases. The detection of malignant extrapulmonary lesions is necessary for correct tumour staging. By combining both metabolic and anatomical information, positron emission tomography/computed tomography is able to depict more unexpected extrapulmonary lesions than computed tomography and positron emission tomography used alone, and positron emission tomography/computed tomography provides more additional information of malignancy or benignancy of lesions detected with one of the two imaging modalities alone.  相似文献   
90.
V-Y肌腱瓣修补术治疗陈旧性跟腱断裂   总被引:15,自引:2,他引:13  
目的 研究V—Y肌腱瓣修补术治疗陈旧性跟腱断裂的手术方法及结果。方法 对9例平均112d的陈旧性跟腱断裂患,采用小腿三头肌V—Y肌腱瓣修补术治疗修补缺损为3.2~6cm,平均4.6cm。结果 平均随访2年8个月,按Arner-Lindholm疗效评定标准评估,优7例(77.8%),良2例(22.2%),优良率为100%。结论 对于陈旧性跟腱断裂,小腿三头肌V—Y肌腱瓣修补术足一种方法简单、疗效满意的手术方法。  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