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   24721篇
  免费   1635篇
  国内免费   160篇
耳鼻咽喉   234篇
儿科学   679篇
妇产科学   555篇
基础医学   3768篇
口腔科学   702篇
临床医学   2001篇
内科学   6256篇
皮肤病学   461篇
神经病学   2279篇
特种医学   756篇
外科学   2171篇
综合类   79篇
一般理论   8篇
预防医学   1987篇
眼科学   305篇
药学   1846篇
中国医学   100篇
肿瘤学   2329篇
  2024年   28篇
  2023年   236篇
  2022年   520篇
  2021年   876篇
  2020年   525篇
  2019年   752篇
  2018年   848篇
  2017年   652篇
  2016年   754篇
  2015年   838篇
  2014年   1049篇
  2013年   1332篇
  2012年   2123篇
  2011年   2114篇
  2010年   1160篇
  2009年   1048篇
  2008年   1684篇
  2007年   1574篇
  2006年   1459篇
  2005年   1281篇
  2004年   1169篇
  2003年   1010篇
  2002年   863篇
  2001年   273篇
  2000年   217篇
  1999年   269篇
  1998年   192篇
  1997年   163篇
  1996年   131篇
  1995年   88篇
  1994年   75篇
  1993年   75篇
  1992年   106篇
  1991年   107篇
  1990年   104篇
  1989年   48篇
  1988年   50篇
  1987年   74篇
  1986年   56篇
  1985年   64篇
  1984年   57篇
  1983年   44篇
  1982年   27篇
  1981年   28篇
  1980年   28篇
  1979年   44篇
  1978年   25篇
  1975年   29篇
  1974年   31篇
  1973年   36篇
排序方式: 共有10000条查询结果,搜索用时 514 毫秒
1.
2.
3.
4.
5.
6.

Objectives

To determine the incidence of incisional hernia (IH) in the extraction incision (EI) in colorectal resection for cancer. To analyze whether the location of the incision has any relationship with the incidence of hernias and whether mesh could be useful for prevention in high-risk patients.

Methods

Retrospective review of the colon and rectal surgery database from January 2015 to December 2016. Data were classified into 2 groups, transverse (TI) and midline incision (MI), and the latter was divided into 2 subgroups (mesh [MIM] and suture [MIS]). Patients were classified using the HERNIAscore. Hernias were diagnosed by clinical and/or CT examination.

Results

A total of 182 out of 210 surgical patients were included. After a median follow-up of 13.0 months, 39 IH (21.9%) were detected, 23 of which (13.4%) were in the EI; their frequency was lower in the TI group (3.4%) and in the MIM group (5.9%) than in the MIS group (29.5%; p = 0.007). The probability of developing IH in the MIS group showed an OR = 11.7 (95%CI: 3.3-42.0) compared to the TI group and 4.3 (IC 95%: 1.1-16.3) versus the MIM group.

Conclusions

The location of the incision is relevant to avoid incisional hernias. Transverse incisions should be used as the first option. When a midline incision is needed, a prophylactic mesh could be considered in high risk patients because it is safe and associated with low morbidity.  相似文献   
7.
In the work described here, our aim was to determine, in an elderly population, changes in muscle thickness (MT), cross-sectional area (CSA) and echo intensity (EI) of the quadriceps muscles at four time points (0, 5, 10 and 15 min; i.e., T0, T5, T10 and T15, respectively) after changing from a standing to supine position. Twenty-one elderly participants (14 men: 68.1 ± 4.6 y; 8 women: 66.8 ± 4.1 y) were evaluated at four time points. Rectus femoris CSA (RFCSA), MT and EI of the quadriceps femoris (QF) muscles were assessed. EI significantly increased from T0 to T5, T10 and T15 (p < 0.001), whereas no differences were observed between T5 and T15 in the rectus femoris (RFEI), vastus intermedius (VIEI) and quadriceps femoris (QFEI). No differences were observed between any time points in the RFCSA and MT of QF muscles. In summary, these results suggest that periods >5 min are not necessary to obtain consistent MT and EI measurements of quadriceps femoris muscles in the elderly population.  相似文献   
8.
9.
Changes in resting energy expenditure (REE) of cancer patients vary depending on type of tumor, treatment time point and kind of treatment. Little is known about REE of acute leukemia adult patients after treatment, especially with results related to body weight or fat free mass (FFM). This study aimed to assess changes in REE of acute leukemia adult patients before and after the first remission induction. Evaluation of REE was performed by indirect calorimetry and predicted REE was calculated by Harris-Benedict equation. Weight and height were measured and compared to a control group of healthy individuals. FFM was assessed by bioelectrical impedance for adjusting REE values. We evaluated 18 patients and 26 healthy individuals. At diagnosis, patients presented REE, REE/weight, and REE/FFM higher than the controls. Reductions of REE, REE/weight, and REE/FFM were also observed in patients after the first cycle of chemotherapy. The predicted REE for the patients group showed significant lower value compared with measured REE. Before the first cycle of chemotherapy REE was increased but undergoes a reduction after treatment, reaching values similar to the controls. For predictive Harris-Benedict equation, stress factors should be added to avoid underestimation of REE before and after chemotherapy.  相似文献   
10.
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