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   210596篇
  免费   5372篇
  国内免费   488篇
耳鼻咽喉   2874篇
儿科学   8012篇
妇产科学   6295篇
基础医学   27774篇
口腔科学   5953篇
临床医学   17113篇
内科学   37725篇
皮肤病学   4840篇
神经病学   13519篇
特种医学   10964篇
外国民族医学   97篇
外科学   31128篇
综合类   1164篇
一般理论   24篇
预防医学   18110篇
眼科学   4570篇
药学   14449篇
  2篇
中国医学   171篇
肿瘤学   11672篇
  2021年   874篇
  2019年   746篇
  2018年   4143篇
  2017年   4383篇
  2016年   3709篇
  2015年   5416篇
  2014年   4999篇
  2013年   4389篇
  2012年   11209篇
  2011年   6101篇
  2010年   2828篇
  2009年   4456篇
  2008年   3122篇
  2007年   3784篇
  2006年   3925篇
  2005年   12022篇
  2004年   13440篇
  2003年   8920篇
  2002年   4041篇
  2001年   4435篇
  2000年   1749篇
  1999年   5919篇
  1992年   6896篇
  1991年   7128篇
  1990年   7364篇
  1989年   6962篇
  1988年   6481篇
  1987年   6260篇
  1986年   5965篇
  1985年   5251篇
  1984年   3601篇
  1983年   2925篇
  1982年   1024篇
  1981年   785篇
  1980年   854篇
  1979年   3839篇
  1978年   2368篇
  1977年   1792篇
  1976年   1564篇
  1975年   2477篇
  1974年   3112篇
  1973年   2742篇
  1972年   2761篇
  1971年   2744篇
  1970年   2556篇
  1969年   2468篇
  1968年   2242篇
  1967年   2164篇
  1966年   1899篇
  1965年   1132篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
A questionnaire survey was carried out to assess the quality of life of 60 patients who had undergone cystectomy because of bladder carcinoma. Urinary diversion was by a continent caecal reservoir in 20 patients and by a conduit in 40. The patients' replies showed that cystectomy could cause severe problems in all aspects of life. Diversion with a continent caecal reservoir was associated with fewer stoma-related problems and seemed to allow the patients greater freedom to continue activities such as sport, travel and social life. Sexual problems, disturbed relationships with partners and emotional and mental problems were common and did not differ between the two groups of patients. It is recommended that patients judged to be prone to mental and emotional disturbance after cystectomy should be identified pre-operatively and given extra psychological support.  相似文献   
996.
In a prospectively randomized study we used two different ways of drainage of the sacral space after an abdomino-perineal-resection of the rectum. One group with 25 patients had a drainage anteriorly through the abdominal wall, the other 25 patients got a drainage posteriorly through the buttocks. In each case we used two closed silicone-drainage-systems without active suction. In 60% of the anterior and in 50% of the posterior drained cases we saw an unaffected primary healing of the sacral wound. There was no significant difference. The patients felt the anterior way of drainage to be more convenient. Contamination of the sacral space by disrupture of the rectum during the operation was followed by a sacral abscess in 50%.  相似文献   
997.
In knee arthroplasty, component malpositioning seems to be a fundamental cause for failure. The degree of malpositioning is important. To investigate this degree, 86 of 137 knee arthroplasties performed with the Townley semiconstrained bicondylar prosthesis were examined after a mean follow-up period of 6.5 years (range, 5.0-8.5 years). Five arthroplasties were excluded because of aseptic loosening, but none of these showed malalignment in postoperative roentgenograms. Clinical results and the patients' reports on deterioration of prosthetic function were correlated with positioning of the prosthetic components. Total alignment between 6 degrees of varus and 7 degrees of valgus was associated with good clinical results. Total alignment of more than 7 degrees of valgus, anterior tilting of the tibial component, or positioning of the femoral component in more than 12 degrees of valgus correlated with relatively poor clinical results.  相似文献   
998.
Urinary D-glucaric acid (DGA) and the activities of gamma-glutamyl transferase (GGT) and other hepatic enzymes in serum were determined in 33 noncirrhotic male alcoholics who had continued to consume alcohol until at least 24 h prior to the taking of samples. DGA excretion was significantly greater in them than in a group of 30 healthy controls (p less than 0.001), exceeding the upper reference level in 38% of the alcoholic cases (as compared with 88% for GGT). In the alcoholic patients, there was highly significant correlation between urinary DGA and serum GGT (r = 0.613, p less than 0.001), suggesting that in both cases the increased levels are due to enzyme induction. None of the biochemical variables studied were significantly correlated with estimated daily alcohol consumption. Urinary DGA levels fell off rapidly with abstinence, and in 31 alcoholic patients who had consumed no alcohol for 5 days, there was no statistically significant correlation between DGA excretion and serum GGT (r = 0.158, p congruent to 0.4).  相似文献   
999.
This paper aims to assess current interventions in psychiatric rehabilitation in the French-speaking world and to discuss future developments. We review examples of policies and practices in Quebec and Europe and discuss the role and involvement of professionals; namely, the psychiatrists and the nursing staff. We also present different rehabilitation strategies and techniques used in the French-speaking world, such as case management, social-skills training, cognitive therapies for psychotic symptoms, family interventions, and return-to-work interventions. In conclusion, we invite psychiatrists to play a more active role in rehabilitation. We recommend the creation of small, specialized units closely linked to the needs of clients, and we propose to integrate social and medical interventions, rather than opposing them.  相似文献   
1000.
The purpose of this study was to analyze the clinical aspects in 130 patients presenting periodic lateralized epileptiform discharges (PLEDs) in their EEG and to compare these results with those found in the literature. Etiology, neurologic deficit, seizure occurrence, and evolution were studied in each patient by historical review. The recordings were obtained on 8- or 16-channel EEGs with electrode placement according to the International 10-20 System. Recordings containing PLEDs were selected. PLEDs were defined as repetitive periodic, focal, or hemispheric epileptiform discharges (spikes, spike and waves, polyspikes, sharp waves) usually recurring every 1 to 2 seconds. The statistical study was carried out via the chi(2) test using the computer program SPSS. The main etiology found in this group of patients was stroke (61 of 130 patients). Other processes found were brain infections, tumors, hematomas, and several other entities grouped together as miscellaneous (anoxic encephalopathy, subarachnoid hemorrhage, craniocerebral trauma, Creutzfeldt-Jacob disease, migraine, multiple sclerosis, and aminophylline intoxication). Half of these patients (65 of 130) developed seizures, mostly partial motor seizures. No significant relation between etiology and seizures was found (chi(2) = 2.81, P = 0.4222). Seizures recurred in 14 of 130 patients during a follow-up of 14.5 months. PLEDs were not recorded in any EEG at the time of seizure recurrence. PLEDs constitute a distinctive but uncommon EEG phenomenon of repetitive, periodic, and stereotyped lateralized complexes. In agreement with the literature, PLEDs were associated with an acute process and occurred early during the course of the illness in all patients studied and were usually associated with structural lesions, with stroke being the main etiology. Traditionally, seizures occur with PLEDs but it is also accepted that they can exist in patients who never develop epileptic activity, either clinically or electrically, as demonstrated in 50% of the patients studied. No significant association between seizures and any etiology could be found. It was not demonstrated that the occurrence of seizures may influence the outcome in any way.  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