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   1755篇
  免费   81篇
  国内免费   8篇
耳鼻咽喉   2篇
儿科学   21篇
妇产科学   48篇
基础医学   135篇
口腔科学   13篇
临床医学   69篇
内科学   347篇
皮肤病学   15篇
神经病学   141篇
特种医学   43篇
外科学   370篇
综合类   11篇
预防医学   117篇
眼科学   2篇
药学   110篇
肿瘤学   400篇
  2023年   7篇
  2022年   17篇
  2021年   26篇
  2020年   20篇
  2019年   21篇
  2018年   36篇
  2017年   21篇
  2016年   35篇
  2015年   36篇
  2014年   54篇
  2013年   66篇
  2012年   102篇
  2011年   91篇
  2010年   62篇
  2009年   67篇
  2008年   128篇
  2007年   99篇
  2006年   115篇
  2005年   82篇
  2004年   90篇
  2003年   79篇
  2002年   63篇
  2001年   53篇
  2000年   59篇
  1999年   52篇
  1998年   23篇
  1997年   21篇
  1996年   28篇
  1995年   22篇
  1994年   19篇
  1993年   17篇
  1992年   27篇
  1991年   27篇
  1990年   26篇
  1989年   21篇
  1988年   16篇
  1987年   21篇
  1986年   23篇
  1985年   13篇
  1984年   14篇
  1983年   8篇
  1982年   4篇
  1981年   3篇
  1980年   5篇
  1979年   8篇
  1978年   5篇
  1977年   2篇
  1976年   3篇
  1904年   1篇
  1885年   1篇
排序方式: 共有1844条查询结果,搜索用时 15 毫秒
81.
82.
Time trends in the incidence of malignant neoplasms of the thyroid were examined for Sweden for the period 1958-81, 5,838 cases being studied. Autopsy-diagnosed cases were excluded. Mean annual changes in the age-standardized rates over this period were 1.9% and 1.2% for women and men, respectively, for all thyroid carcinomas combined; 4.9% and 2.1% for papillary carcinoma; 0.9% and 2.1% for follicular carcinoma; and -1.0% and -2.1% for anaplastic carcinoma. Age, period and cohort models were fitted. There was a progressive increase in papillary cancer incidence for cohorts born since 1919. This increase cannot be satisfactorily explained as an artefact of trends in classification, and probably reflects a real increase in incidence. A less marked increase was seen for follicular cancer, and there was a decline for cohorts born since 1939. While the risk of papillary and anaplastic carcinoma was lower in iodine-deficient areas, follicular cancer risk was twice as high in these areas, for men only. There was a steady decline of anaplastic cancer in both sexes after 1965, largely attributable to a decline in cohorts born since 1924.  相似文献   
83.
84.
The presence of T-wave inversion (TWI) at 12-lead electrocardiogram (ECG) in competitive athletes is one of the major diagnostic challenges for sports physicians and consulting cardiologists. Indeed, while the presence of TWI may be associated with some benign conditions and it may be occasionally seen in healthy athletes presenting signs of cardiac remodeling, it may also represent an early sign of an underlying, concealed structural heart disease or life-threatening arrhythmogenic cardiomyopathies, which may be responsible for exercise-related sudden cardiac death (SCD). The interpretation of TWI in athletes is complex and the inherent implications for the clinical practice represent a conundrum for physicians. Accordingly, the detection of TWI should be viewed as a potential red flag on the ECG of young and apparently healthy athletes and warrants further investigations because it may represent the initial expression of cardiomyopathies that may not be evident until many years later and that may ultimately be associated with adverse outcomes. The aim of this review is, therefore, to report an update of the literature on TWI in athletes, with a specific focus on the interpretation and management.  相似文献   
85.

Background

Homeostasis model assessment of insulin resistance (HOMA2-IR) and HbA1c, markers of metabolic syndrome and glycemic control, were compared with Electro Sensor (ES) Complex software algorithms. ES complex software integrates data from Electro Sensor Oxi (ESO; spectrophotometry) and Electro Sensor-Body Composition (ES-BC; bioimpedance).

Methods

One hundred forty-eight Brazilian obese candidates for bariatric surgery underwent complete physical examinations, laboratory tests (fasting plasma glucose, fasting plasma insulin, and HbA1c) and ES complex assessments. HOMA2-IR was calculated from fasting plasma glucose and fasting plasma insulin using free software provided by The University of Oxford Diabetes Trial Unit. ES complex?Cinsulin resistance (ESC-IR) and ES complex?Cblood glucose control (ESC-BCG) were calculated from ESO and ES-BC data using ES complex software. Correlations between HOMA2-IR and ESC-IR and between ESC-BGC and HbA1c were determined.

Results

ESC-BGC was correlated with HbA1c (r?=?0.85). ESC-BCG values >3 were predictive of HbA1c?>?6.5?% (???=?0.94; unweighted ???=?0.9383). ESC-IR was correlated with HOMA2-IR (r?=?0.84). Patients with ESC-IR score >2.5 or >3 were more likely to have metabolic syndrome or insulin resistance, respectively, compared with HOMA2-IR value >1.4 and >1.8, respectively. ESC-IR performance was evaluated by receiver operating characteristic curves. The areas under the curve for metabolic syndrome and insulin resistance were 0.9413 and 0.9022, respectively.

Conclusion

The results of this study in Brazilian subjects with obesity suggest that ES complex algorithms will be useful in large-scale screening studies to predict insulin resistance, metabolic syndrome, and HbA1c >6.5?%. Additional studies are needed to confirm these correlations in non-obese subjects and in other ethnic groups.  相似文献   
86.
87.
The exceptional case of a 19-month-old boy with an apparently isolated frontal lesion and a huge holocord neoplastic involvement, presenting with a subtly indolent preoperative course and a particularly tumultuous evolution, is reported. The diagnosis of embryonal tumour with abundant neuropil and true rosettes was posed.  相似文献   
88.

Background  

Decompressive craniectomy is an effective treatment option in case of refractory intracranial hypertension after severe head injury. The incidence of complications following cranial repair after decompressive craniectomy for traumatic brain injury is not negligible, particularly in infants and young toddlers. However, only a few dedicated papers can be found in the literature.  相似文献   
89.

Background  

Although endoscopic septostomy is widely adopted in the treatment of unilateral or specific types of hydrocephalus, there is no consensus on surgical indications, technical aspects and postoperative outcome. In particular, the choice of the ventricular access has been recently debated. We investigated the results of endoscopic septostomy performed through a standard precoronal ventricular access using a rigid endoscope.  相似文献   
90.
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