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   2643492篇
  免费   197691篇
  国内免费   5131篇
耳鼻咽喉   36519篇
儿科学   88528篇
妇产科学   72700篇
基础医学   374691篇
口腔科学   74784篇
临床医学   236357篇
内科学   519668篇
皮肤病学   59246篇
神经病学   206250篇
特种医学   102475篇
外国民族医学   868篇
外科学   404088篇
综合类   59556篇
现状与发展   5篇
一般理论   849篇
预防医学   198421篇
眼科学   61721篇
药学   194584篇
  8篇
中国医学   6075篇
肿瘤学   148921篇
  2019年   20072篇
  2018年   29064篇
  2017年   21980篇
  2016年   24179篇
  2015年   27492篇
  2014年   38264篇
  2013年   56923篇
  2012年   78544篇
  2011年   82957篇
  2010年   49460篇
  2009年   46556篇
  2008年   78042篇
  2007年   83172篇
  2006年   83915篇
  2005年   80716篇
  2004年   78467篇
  2003年   75157篇
  2002年   72938篇
  2001年   133964篇
  2000年   137672篇
  1999年   115465篇
  1998年   30899篇
  1997年   27378篇
  1996年   27694篇
  1995年   26497篇
  1994年   24642篇
  1993年   22771篇
  1992年   89367篇
  1991年   86812篇
  1990年   83941篇
  1989年   80466篇
  1988年   73766篇
  1987年   72331篇
  1986年   67780篇
  1985年   64518篇
  1984年   47954篇
  1983年   40591篇
  1982年   23096篇
  1981年   20794篇
  1979年   42514篇
  1978年   29412篇
  1977年   25054篇
  1976年   23298篇
  1975年   24997篇
  1974年   29870篇
  1973年   28516篇
  1972年   26519篇
  1971年   24214篇
  1970年   22701篇
  1969年   20966篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.

Background and objectives

A prompt and effective management of trauma patient is necessary. The aim of this case report is to highlight the importance of intraoperative echocardiography as a useful tool in patients suffering from refractory hemodynamic instability no otherwise explained.

Case report

A 41 year‐old woman suffered a car accident. At the emergency department, no abnormalities were found in ECG or chest X‐ray. Abdominal ultrasound revealed the presence of abdominal free liquid and the patient was submitted to urgent exploratory laparotomy. Nevertheless, she persisted suffering arterial hypotension and metabolic acidosis. Looking for the reason of her hemodynamic instability, intraoperative transthoracic echocardiography was performed, finding out the presence of pericardial effusion. Once the cardiac surgeon extracted pericardial clots, patient's situation improved clinically and analytically.

Conclusion

Every anesthesiologist should be able to use the intraoperative echocardiography as an effective tool in order to establish the appropriate measures to promote the survival of patients suffering severe trauma.  相似文献   
53.
54.

Objective

Comparative survival between neoadjuvant chemotherapy and adjuvant chemotherapy for patients with cT2-4N0-1M0 non–small cell lung cancer has not been extensively studied.

Methods

Patients with cT2-4N0-1M0 non–small cell lung cancer who received platinum-based chemotherapy were retrospectively identified. Exclusion criteria included stage IV disease, induction radiotherapy, and targeted therapy. The primary end point was disease-free survival. Secondary end points were overall survival, chemotherapy tolerance, and ability of Response Evaluation Criteria In Solid Tumors response to predict survival. Survival was estimated using the Kaplan–Meier method, compared using the log-rank test and Cox proportional hazards models, and stratified using matched pairs after propensity score matching.

Results

In total, 330 patients met the inclusion criteria (n = 92/group after propensity-score matching; median follow-up, 42 months). Five-year disease-free survival was 49% (95% confidence interval, 39-61) for neoadjuvant chemotherapy versus 48% (95% confidence interval, 38-61) for adjuvant chemotherapy (P = .70). On multivariable analysis, disease-free survival was not associated with neoadjuvant chemotherapy or adjuvant chemotherapy (hazard ratio, 1.1; 95% confidence interval, 0.64-1.90; P = .737), nor was overall survival (hazard ratio, 1.21; 95% confidence interval, 0.63-2.30; P = .572). The neoadjuvant chemotherapy group was more likely to receive full doses and cycles of chemotherapy (P = .014/0.005) and had fewer grade 3 or greater toxicities (P = .001). Response Evaluation Criteria In Solid Tumors response to neoadjuvant chemotherapy was associated with disease-free survival (P = .035); 15% of patients receiving neoadjuvant chemotherapy (14/92) had a major pathologic response.

Conclusions

Timing of chemotherapy, before or after surgery, is not associated with an improvement in overall or disease-free survival among patients with cT2-4N0-1M0 non–small cell lung cancer who undergo complete surgical resection.  相似文献   
55.
56.
57.
58.
We report a Chinese family with members affected by epidermolytic ichthyosis (EI), caused by KRT gene mutations. The proband was a 14‐year‐old boy who had simultaneous appearance of nephroblastoma and epidermolytic ichthyosis (EI). Both the patient and his mother exhibited the specific clinical and pathological manifestations of EI. We analysed all exons and flanking sequences of the KRT1 and KRT10 genes using PCR, and found that the proband and his mother had a G>C transition at nucleotide position 1432 in exon 7 of KRT1, resulting in an amino acid substitution of glutamate (GAA) to glutamine (CAA) at codon 478 (E478Q). The KRT10 gene had no mutations.  相似文献   
59.
60.
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