全文获取类型
收费全文 | 534158篇 |
免费 | 27896篇 |
国内免费 | 511篇 |
专业分类
耳鼻咽喉 | 6748篇 |
儿科学 | 17041篇 |
妇产科学 | 12629篇 |
基础医学 | 93176篇 |
口腔科学 | 12742篇 |
临床医学 | 48808篇 |
内科学 | 96270篇 |
皮肤病学 | 11950篇 |
神经病学 | 34267篇 |
特种医学 | 19853篇 |
外国民族医学 | 53篇 |
外科学 | 78587篇 |
综合类 | 7641篇 |
现状与发展 | 2篇 |
一般理论 | 107篇 |
预防医学 | 39077篇 |
眼科学 | 11992篇 |
药学 | 41684篇 |
1篇 | |
中国医学 | 1173篇 |
肿瘤学 | 28764篇 |
出版年
2021年 | 4055篇 |
2019年 | 4026篇 |
2018年 | 5891篇 |
2017年 | 4220篇 |
2016年 | 4989篇 |
2015年 | 5518篇 |
2014年 | 7325篇 |
2013年 | 10706篇 |
2012年 | 15909篇 |
2011年 | 17763篇 |
2010年 | 10154篇 |
2009年 | 8972篇 |
2008年 | 15975篇 |
2007年 | 17658篇 |
2006年 | 17129篇 |
2005年 | 16438篇 |
2004年 | 16037篇 |
2003年 | 15384篇 |
2002年 | 14911篇 |
2001年 | 22515篇 |
2000年 | 23040篇 |
1999年 | 18964篇 |
1998年 | 5252篇 |
1997年 | 4381篇 |
1996年 | 4406篇 |
1995年 | 4138篇 |
1992年 | 14448篇 |
1991年 | 15843篇 |
1990年 | 15973篇 |
1989年 | 15643篇 |
1988年 | 14331篇 |
1987年 | 14223篇 |
1986年 | 13182篇 |
1985年 | 12704篇 |
1984年 | 9408篇 |
1983年 | 8015篇 |
1982年 | 4190篇 |
1979年 | 8950篇 |
1978年 | 6394篇 |
1977年 | 5150篇 |
1976年 | 5506篇 |
1975年 | 6618篇 |
1974年 | 7423篇 |
1973年 | 7167篇 |
1972年 | 6600篇 |
1971年 | 6317篇 |
1970年 | 5896篇 |
1969年 | 5472篇 |
1968年 | 5169篇 |
1967年 | 4627篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
K. Dahan V. Audard F. Roudot-Thoraval D. Desvaux M. Abtahi H. Mansour M. Kumal P. Lang P. Grimbert 《American journal of transplantation》2006,6(7):1725-1730
The clinical outcome and appropriate management for patients showing 'borderline changes' on allograft biopsy after renal transplantation is still controversial. In an attempt to identify predictive factors of clinical outcome of patients with such lesions, we reviewed the clinical course of 91 patients with borderline changes. Multivariate analysis revealed significant and independent effects of histological stage (i + t < or = or > 2) and time to borderline changes (< or = or > 3 months after transplant) on serum creatinine levels at 1 year from borderline changes episodes (respectively, p = 0.04 and p = 0.02) and only a significant effect of time to borderline changes on serum creatinine levels at 2 years (p = 0.005). Renal function at 1 year and 2 years as 5- and 8-year graft survival were not significantly different in the group of patients treated with antirejection therapy (T group, n = 49) compared with the untreated group (UT group, n = 42). This study strongly suggests that borderline changes with histological score (i + t) > 2 and late episodes of borderline changes should be considered to be of poor prognosis. 相似文献
23.
24.
OBJECTIVE: Gelastic seizures are a frequent and well established manifestation of the epilepsy associated with hypothalamic hamartomas. The scalp EEG recordings very seldom demonstrate clear spike activity and the information about the ictal epilepsy dynamics is limited. In this work, we try to isolate epileptic rhythms in gelastic seizures and study their generators. METHODS: We extracted rhythmic activity from EEG scalp recordings of gelastic seizures using decomposition in independent components (ICA) in three patients, two with hypothalamic hamartomas and one with no hypothalamic lesion. Time analysis of these rhythms and inverse source analysis was done to recover their foci of origin and temporal dynamics. RESULTS: In the two patients with hypothalamic hamartomas consistent ictal delta (2-3 Hz) rhythms were present, with subcortical generators in both and a superficial one in a single patient. The latter pattern was observed in the patient with no hypothalamic hamartoma visible in MRI. The deep generators activated earlier than the superficial ones, suggesting a consistent sub-cortical origin of the rhythmical activity. CONCLUSIONS: Our data is compatible with early and brief epileptic generators in deep sub-cortical regions and more superficial ones activating later. SIGNIFICANCE: Gelastic seizures express rhythms on scalp EEG compatible with epileptic activity originating in sub-cortical generators and secondarily involving cortical ones. 相似文献
25.
In rare cases the usage of the internal thoracic vessels as recipient vessels in reconstructive surgery of the head and neck region with free tissue transfer is a challenging but valid alternative if local recipient vessels are unusable. 相似文献
26.
Parupudi V J Sriram Guduru V Rao Nageshwar D Reddy 《Indian journal of gastroenterology》2006,25(1):39-41
Endoscopic clips have been used mainly for control of gastrointestinal (GI) bleeding and occasionally for closure of GI perforations. However, closure of spontaneous esophageal perforation (Boerhaave's syndrome) by clipping has not been reported. We described successful non-surgical closure of spontaneous esophageal perforation by endoscopic clipping in a patient with bilateral pyopneumothorax and septicemia. 相似文献
27.
JM Martín† L Calduch† C Monteagudo‡ I Molina† D Ramón† V Alonso† E Jordᆠ《Journal of the European Academy of Dermatology and Venereology》2006,20(4):428-431
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified. 相似文献
28.
29.
Published data devoted to making and characterization of the properties of polymeric wound dressings with proteolytic action
are reviewed. These data are indicative of individual dependence of the physicochemical properties, activity, and stability
of each particular enzyme on the type of polymer matrix and the method of immobilization. In order to obtain wound dressings,
which are active in physiological medium and retain their activity upon sterilization, it is necessary to optimize the composition
and characteristics of a polymer matrix and the enzyme included into its structure.
__________
Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 8, pp. 24–28, August, 2006. 相似文献
30.
A survey of plants used as wild vegetables was conducted in four districts of Botswana in August and September 2005. The objective was to determine which wild plants were used as vegetables in the study area, and to document their cooking and preservation methods. Fourteen species representing seven families were mentioned as wild vegetables. In addition, six species from four families had other uses in traditional medicine. The implications of the documented processing methods on the retention of nutrients in the vegetables are discussed. 相似文献