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   64864篇
  免费   4596篇
  国内免费   170篇
耳鼻咽喉   829篇
儿科学   1781篇
妇产科学   1611篇
基础医学   10529篇
口腔科学   1699篇
临床医学   6153篇
内科学   13130篇
皮肤病学   1190篇
神经病学   5995篇
特种医学   2748篇
外国民族医学   45篇
外科学   8300篇
综合类   548篇
一般理论   83篇
预防医学   5090篇
眼科学   1204篇
药学   4647篇
中国医学   162篇
肿瘤学   3886篇
  2022年   466篇
  2021年   1033篇
  2020年   652篇
  2019年   921篇
  2018年   1130篇
  2017年   792篇
  2016年   945篇
  2015年   1120篇
  2014年   1370篇
  2013年   2385篇
  2012年   3001篇
  2011年   3099篇
  2010年   2256篇
  2009年   1916篇
  2008年   2804篇
  2007年   2949篇
  2006年   2941篇
  2005年   2771篇
  2004年   2833篇
  2003年   2579篇
  2002年   2652篇
  2001年   2165篇
  2000年   2230篇
  1999年   2020篇
  1998年   940篇
  1997年   784篇
  1996年   701篇
  1995年   718篇
  1994年   608篇
  1993年   641篇
  1992年   1504篇
  1991年   1407篇
  1990年   1376篇
  1989年   1361篇
  1988年   1155篇
  1987年   1137篇
  1986年   1073篇
  1985年   972篇
  1984年   727篇
  1983年   665篇
  1982年   478篇
  1981年   461篇
  1980年   395篇
  1979年   626篇
  1978年   384篇
  1977年   365篇
  1975年   381篇
  1974年   416篇
  1973年   356篇
  1972年   347篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
More than 10 years registration of continuing medical education as part of quality control by The Netherlands Society for Oto‐Rhino‐Laryngology and Cervico‐Facial Surgery After more than 10 years registration, 93% of ENT specialists in The Netherlands fulfil the requirements for continuing medical education in spite of the fact that sanctions (no re‐registration) have not been implemented to date. Improvements have been made over the years. Information about how to set up a comparable system was supplied to 10 other scientific societies. A recurrent point for discussion is whether or not to award points for presentations, papers and (co)publications. On the one hand, it seems reasonable to reward the effort but, on the other hand, it creates practical problems. As a matter of fact, all members who give papers and write articles appear to attend more than enough postgraduate education. The process of accurate registration of continuing medical education, including accreditation and certification, is time‐consuming. Moreover, it requires intensive and essential supervision by an experienced colleague who has a thorough knowledge of the specialist field.  相似文献   
102.
To estimate the evolution of amyloid in tissue, we studied abdominal fat aspirates of cases with familial amyloidotic polyneuropathy (FAP) longitudinally at regular intervals between 1994 and 2006. In 22 cases (13 carriers and nine patients) not yet transplanted median follow-up was 3.3 years (range 0.4-11.3). We found a significant increase in the amyloid grade of fat tissue from 2+ to 4+ and from 0 to 4+ in two of three subjects with follow-ups of >7 years, after 7 and 11 years, respectively. All other subjects remained negative or did not show a significant change. In 11 liver transplant patients, follow-up with fat aspirate was available with a median duration of 3.1 years (range 1.0-10.1). A comparison was made with cardiac amyloid as judged by the cardiac septum diameter and the serum NT-ProBNP (N-terminal pro-B-type natriuretic peptide) level. No stable increase of amyloid in fat was seen in any patient. A stable decrease of amyloid grade was seen in one patient 5 years after transplantation. In contrast, the cardiac septum diameter increased >or=4 mm in six of the 11 transplant patients. Our study shows the diagnostic utility of a regularly repeated fat aspirate in carriers at risk for the development of ATTR amyloidosis. Evolution of amyloid deposition in fat tissue is very gradual. After liver transplantation, amyloid deposition in fat tissue seems to stabilize and may even decrease in the long term, whereas amyloid deposition in cardiac tissue appears to be progressive.  相似文献   
103.
104.
105.
Edited by Lauren Dundes. Walnut Creek (CA): Altamira Press, 2003. 239 pages. $27.95, paperback, $75.00, hardback.  相似文献   
106.
107.
This study was undertaken to evaluate changes in relative (99m)Tc-hydrazinonicotinamide (HYNIC)-annexin V tumor uptake over time in patients undergoing chemotherapeutic treatment at baseline and at 5-7 h and 40-44 h after treatment initiation. Imaging results are related to clinical outcomes, as assessed with response evaluation criteria in solid tumors (RECIST). METHODS: We prospectively included 20 patients (11 men and 9 women; mean age, 59.8 y; range, 22-75 y) scheduled for chemotherapy (n = 19) or bisphosphonate treatment (n = 1). Curable disease was present in 5 patients. The other patients had metastatic disease and were treated in a palliative setting. Three of the 20 enrolled patients were excluded from analysis: 1 patient ultimately refused the proposed chemotherapy treatment; because of difficulties with the labeling procedure, 1 patient did not receive a pretreatment scan; and 1 patient presented with an allergic reaction (rash and nausea) to the (99m)Tc-HYNIC-annexin V formulation. The remaining 17 patients underwent 3 scintigraphic scans with (99m)Tc-HYNIC-annexin V: before treatment and 5-7 h and 40-44 h after treatment initiation. The tumor response was evaluated with RECIST and related to observed changes in the ratios of tumor activity to background activity for the largest known lesion; values exceeding 25% the baseline value on either the 5- to 7-h scan or the 40- to 44-h scan were considered significant. RESULTS: With the proposed sequential imaging protocol and a 25% change threshold, responders to treatment could be separated from nonresponders with a 94% accuracy (16/17 patients). CONCLUSION: Sequential (99m)Tc-HYNIC-annexin V imaging may allow for assessment of the response to chemotherapy within 3 d after treatment initiation.  相似文献   
108.
Background. Medication adherence impacts healthcare utilization. Pharmacy records are useful to establish fill patterns. Objective. Use pharmacy records to establish medication patterns fill patterns for comparison to healthcare utilization. Methods. Pharmacy records of 175 children with persistent asthma were collected and compared to healthcare utilization. Results. Majority of subjects had significant healthcare utilization, low numbers of rescue medications, and poor controller medication fill rates. Those with more rescue medications had more healthcare utilization and more controller medications. Conclusions. Pharmacy fill patterns demonstrate few rescue and/or controller medication fills. Those with more rescue medications reported increased healthcare utilization despite controller medications.  相似文献   
109.
110.
AIM: The authors report an alternative procedure to carotid endarterectomy with internal carotid artery (ICA) segmental resection and end-to-end anastomosis associated with temporary shunt and venous patch angioplasty. Design: prospective cohort study. METHODS: Between May 1995 and December 2004, 192 patients underwent 200 primary CEAs for significant ICA stenosis. There were 131 men and 61 women with a mean age of 72.4+/-8.4 years. The indications for CEA were asymptomatic lesions in 51.5%, transient ischemic attack in 27.5% and stroke in 21%. RESULTS: The combined early morbidity and mortality rate was 2%. Two patients died, one due to fatal intracerebral hemorrhage and the second patient died of acute mesenteric ischemia. Neurological complications occurred in 2 patients, including 1 TIA and 1 nondisabling cerebrovascular accident. Non-neurological complications occurred in 26 patients (13.5%). Seventeen patients (8.8%) developed hypertension, 3 neck hematomas (1.5%) required surgical evacuation, 1 patient had reversible supraventricular arrhythmia (0.5%) and 1 patient had pneumonia (0.5%). Furthermore, 1 asymptomatic carotid occlusion was identified (0.5%) and 3 patients suffered permanent cranial nerve injury (1.5%). Mean follow-up was 45.7 months and there were 41 late deaths (21.8%). Survival rates at 1 and 5 years were 96.7+/-1.2% and 73.58+/-4.2%, respectively. CONCLUSIONS: CEA with ICA shortening and reanastomosis is a safe and reliable procedure without any increase in morbidity or mortality.  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