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   91863篇
  免费   5986篇
  国内免费   4088篇
耳鼻咽喉   1598篇
儿科学   1518篇
妇产科学   3515篇
基础医学   11808篇
口腔科学   2030篇
临床医学   9269篇
内科学   15009篇
皮肤病学   1557篇
神经病学   6637篇
特种医学   2679篇
外国民族医学   52篇
外科学   8991篇
综合类   8149篇
现状与发展   19篇
一般理论   6篇
预防医学   6505篇
眼科学   2965篇
药学   10204篇
  62篇
中国医学   3056篇
肿瘤学   6308篇
  2023年   1018篇
  2022年   2743篇
  2021年   3734篇
  2020年   2494篇
  2019年   2516篇
  2018年   2844篇
  2017年   2328篇
  2016年   2351篇
  2015年   3120篇
  2014年   4062篇
  2013年   3853篇
  2012年   5688篇
  2011年   6433篇
  2010年   3756篇
  2009年   2672篇
  2008年   4107篇
  2007年   4574篇
  2006年   4689篇
  2005年   4552篇
  2004年   3657篇
  2003年   3594篇
  2002年   3071篇
  2001年   2189篇
  2000年   2274篇
  1999年   2142篇
  1998年   1156篇
  1997年   942篇
  1996年   734篇
  1995年   679篇
  1994年   541篇
  1993年   362篇
  1992年   795篇
  1991年   696篇
  1990年   693篇
  1989年   691篇
  1988年   746篇
  1987年   684篇
  1986年   679篇
  1985年   608篇
  1984年   473篇
  1979年   607篇
  1978年   360篇
  1975年   368篇
  1974年   543篇
  1973年   536篇
  1972年   454篇
  1971年   422篇
  1970年   400篇
  1969年   421篇
  1968年   367篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
An evaluation of treatment results of unstable spine fractures using the Harrington instruments in 37 patients has been performed. The described method can result in anatomical restoration of the vertebral canal. If vertebral canal lumen is not restored, anterior decompression should be performed making possible removal of posteriorly dislocated bone fragments. The earlier anterior decompression, the greater chance of improvement of neurological conditions. The described procedure is especially useful in fractures with partial palsy. After treatment 70 per cent of the patients with partial palsy resumed their normal lives.  相似文献   
22.
The value of different methods of treatment of brain abscess in the CT era   总被引:3,自引:0,他引:3  
Summary 67 cases of brain abscess were analyzed retrospectively. As 2 comatose patients died on admission before any treatment was started, the results are based on 65 treated patients. Different methods of treatment included: total removal in 36 patients, drainage in 14, aspiration in 6 and conservative treatment in 9. Management mortality was 18,5% and was almost not dependent on the method of treatment (except aspiration) being lowest in the drainage group. The mortality was significantly higher in patients with serious impairment of consciousness on admission.Follow-up examination after 1 to 11 years was performed in 47 out of 53 discharged patients and revealed in 25 of them (53%) full recovery. 10 additional cases (21%) are independent. The best early and long term results were obtained in patients by drainage and medical treatment.Chronic epilepsy developed in 34% of patients with supratentorial lesions. The risk of epilepsy was lowest in the group of patients treated by drainage.The authors present the opinion that removal of brain abscess is necessary only in exceptional cases.  相似文献   
23.
24.
The hereditary characteristics of enzyme deficiency and dermatoglyphics in congenital color blindness (CCB) were studied. We propose that there is a linkage between the two loci on the X-chromosome determining CCB and glucose-6-phosphate dehydrogenase (G6PD), based on our study of a high incidence of G6PD deficiency in 156 male cases with CCB. The CCB gene is closely linked with that of G6PD deficiency from our pedigree investigations. The rise in the frequency of eight or more whorls, the low value of atd angle and the presenting rate of real palmar patterns of the thenar, hypothenar and I, areas presented the hereditary traits of congenital color blindness.  相似文献   
25.
Histamine (HA) concentrations and HA metabolizing enzyme activities were measured in macroscopically unchanged mammary glands and in tumor tissue of C3H mice carrying spontaneous mammary tumor as well as im mammary glands of control subjects matched for age.The great fall in HA level and the enzyme activities in tumor tissue was confirmed. In host mammary glands which showed no current evidence of neoplasm, consistently lower than normal HA concentrations and elevated transglutaminase (TG) activity were found, It is suggested, therefore, that HA level and TG activity may provide an early indication of the development of spontaneous mammary tumor.  相似文献   
26.
Between 1980 and 1987, 113 children with astrocytoma of the cerebellum were treated. The range of the age was 11 months to 15 years. 103 children were treated by surgery only and 10 received surgery and postoperative irradiation. Shunting was necessary in 22% patient with cerebellar astrocytoma. One-year survival for patients with cerebellar astrocytoma was 97%, five-year 89%.  相似文献   
27.
A case of 20 years old patient with the gunshot injury of the spine was presented. The bullet has stuck in the spinal canal at L3-L4 level causing no neurological disturbances. It was removed in our department gunshot wounds to do this in district hospital. No complication occurred in the postoperative course.  相似文献   
28.
AIM: To check on reproducibility of parameters of the cutaneous electrogastrogram registered at a close or a distant time span. METHODS: Twenty-two volunteers recruited by an advertisement (11 females and 11 males, median age 25 years, range: 18-35) underwent three surface electrogastrography examinations of which two were taken on consecutive days and the third one was accomplished at least 2 weeks before or after the two other sessions. The examination involved a 30-min fasted recording, followed by a 90-min postprandial registration after intake of a 394-kcal mixed solid-liquid test meal. RESULTS: Parameters of the electrogastrogram pertaining to the frequency of the gastric slow waves exhibited good to moderate reproducibility, whereas fair reproducibility characterized parameters expected to describe the power of gastric slow waves. With the exception of the difference fed minus fasted power (DeltaDP), in no instance was the medium term reproducibility any worse than the short term one. Categorical data analysis revealed that the relative time share of normogastria postprandially exhibited a better reproducibility than in the fasted period. The Cohen's kappa-value of 0.459 for the DeltaDP for the medium term reproducibility placed this parameter within the range of moderate agreement between repeat examinations. Of the two two-parameter combinations considered, the alliance of the fasted and fed normogastria performed worse than any of those parameters considered alone, whereas a combination of the DeltaDP with the fed-state normogastria revealed a kappa-value amounting to 0.510 for the medium term reproducibility. CONCLUSIONS: The feasibility of some electrogastrographic parameters to convey clinically useful information may be hampered by their fair reproducibility. Recoding of parameters of the cutaneous electrogastrogram from primary continuous to secondary categorical may help achieve a better agreement between repeat examinations.  相似文献   
29.
30.
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