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   1106篇
  免费   54篇
  国内免费   3篇
儿科学   16篇
妇产科学   34篇
基础医学   158篇
口腔科学   24篇
临床医学   61篇
内科学   222篇
皮肤病学   3篇
神经病学   83篇
特种医学   23篇
外科学   343篇
综合类   1篇
预防医学   33篇
眼科学   62篇
药学   17篇
中国医学   1篇
肿瘤学   82篇
  2024年   1篇
  2023年   10篇
  2022年   16篇
  2021年   38篇
  2020年   10篇
  2019年   31篇
  2018年   34篇
  2017年   26篇
  2016年   23篇
  2015年   29篇
  2014年   64篇
  2013年   68篇
  2012年   77篇
  2011年   83篇
  2010年   59篇
  2009年   45篇
  2008年   73篇
  2007年   67篇
  2006年   74篇
  2005年   60篇
  2004年   58篇
  2003年   60篇
  2002年   63篇
  2001年   4篇
  2000年   5篇
  1999年   11篇
  1998年   13篇
  1997年   7篇
  1996年   4篇
  1995年   8篇
  1994年   3篇
  1993年   2篇
  1992年   5篇
  1991年   3篇
  1990年   4篇
  1989年   1篇
  1988年   2篇
  1987年   2篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1983年   3篇
  1982年   3篇
  1981年   3篇
  1980年   3篇
  1978年   1篇
  1977年   1篇
  1972年   1篇
  1970年   1篇
  1962年   1篇
排序方式: 共有1163条查询结果,搜索用时 15 毫秒
991.
In the past 10 years, autophagy has emerged as a crucial regulator of T‐cell homeostasis, activation, and differentiation. Through the ability to adjust the cell's proteome in response to different stimuli, different forms of autophagy have been shown to control T‐cell homeostasis and survival. Autophagic processes can also determine the magnitude of the T‐cell response to TCR engagement, by regulating the cellular levels of specific signaling intermediates and modulating the metabolic output in activated T cells. In this review we will examine the mechanisms that control autophagy activity in T cells, such as ROS signaling and signaling through common gamma‐chain cytokine receptors, and the different aspect of T‐cell biology, including T‐cell survival, effector cell function, and generation of memory, which can be regulated by autophagy.  相似文献   
992.

Study Objective

To investigate the pregnancy and neonatal outcomes of surgical treatment for adnexal torsion (AT) during pregnancy.

Design

A retrospective case-control study (Canadian Task Force classification II-2).

Setting

A tertiary care academic medical center.

Measurements and Main Results

The study group included all parturients who underwent surgery for suspected AT during pregnancy from January 2005 to January 2017. The control group included parturients with an uneventful pregnancy matched by maternal age, parity, multiple gestation, and pregnancy complications. The primary outcome was gestational age at delivery. Secondary outcomes were perinatal outcomes and intraoperative and immediate postoperative complications. Among 85 study group patients with suspected AT, 78 (91.7%) underwent laparoscopy and 7 (8.3%) laparotomy. Torsion was diagnosed in 84 patients (98.8%). The gestational age at delivery was similar between the study and control groups (38.7?±?1.5 vs 38.6?±?1.6 weeks, respectively; p?=?.908) as was preterm labor (5.8% in both groups, p?=?1.00). There was no significant difference between the study and control groups in pregnancy and neonatal outcomes, including Apgar scores, mean cord blood pH (7.25?±?0.1 and 7.26?±?0.08, respectively), and birth weight (3040?±?473?g and 3115?±?584?g, respectively). In the study group, the mean gestational age at surgery was 11.2?±?6 weeks (range, 4–34 weeks). The average operative time was 40.2?±?22 minutes. In the postoperative follow-up, 3 (3.5%) patients had a first trimester miscarriage. A previous cesarean delivery was a risk factor for ovarian torsion during pregnancy (p?=?.012).

Conclusion

Adnexal detorsion with or without additional surgical procedures during pregnancy did not affect the gestational age at delivery and did not appear to increase fetal or maternal complication rates.  相似文献   
993.
The purpose of this study was to evaluate information visualization of publicly-reported central line-associated blood stream infection (CLABSI) outcome data for decision making by diverse target audiences – health care consumers and practitioners. We describe the challenges in publicly reporting of healthcare-associated infections (HAIs) data and the interpretation of an evaluation metric. Several options for visualization of CLABSI data were designed and evaluated employing exploratory working group, two confirmatory focus groups’ observations, and experts’ committee validation of the final designs. Survey-data collection and evaluation criteria results, collected from the two focus groups, are presented and are used to develop the final recommendations for how to visualize publicly-reported CLABSI data from Maryland acute care hospitals. Both health care consumer and practitioner’s perspectives are highlighted and categorized based on the visualizations’ dimensions framework. Finally, a recommended format for visualizing CLABSI outcome data based on the evaluation study is summarized.Key Words: Usability of Health Information, Public Health Informatics, Information Graphics, Information Visualization, Sense Making, Visual Communication  相似文献   
994.
ABSTRACT

Aim: To evaluate the results of bilateral lateral rectus to superior rectus myopexy for the treatment of acquired adult distance esotropia.

Methods: The charts of all adult patients who were operated for esotropia by the first author at the Department of Ophthalmology, Assaf Harofeh Medical Center, Tel Aviv University, Zrifin, Israel, between the years 2010-2015 were analyzed. Patients with the following inclusion criteria were included: acquired esotropia (not present during childhood); deviation greater for distance than near by at least 4 prism diopters (PD); slight abduction deficit in one or both eyes and/or displacement of the lateral rectus downwards as evident by CT/MRI with or without superior rectus nasal shift and no neurologic abnormalities such as cranial nerve palsies or other.

Results: Eighteen patients were identified (age 31–80 years, mean 49.6 years, 77.7% females). Pre-operative esodeviation averaged 24.3 PD (range 14–35 PD) for distance and 15.7 PD (range 8-25 PD) for near. Thirteen patients (72%) had diplopia. All patients were myopic (average -5.54 diopters, range -2.00 to -13.00). All patients underwent bilateral superior rectus–lateral rectus myopexy. Seven patients needed additional single medial rectus recession of between 2–6 mm, and two had additional inferior rectus recession. After a follow-up period of 3–52 months (average 16 months), 16/18 patients (88%) had a deviation less than 5 PD. No overcorrections were noted.

Conclusion: Lateral to superior rectus myopexy is a safe and effective treatment for patients with distance esotropia in which displacement of these muscles is identified. Additional single medial rectus and/or inferior rectus recession may be needed in some patients.  相似文献   
995.
996.
ObjectiveTo investigate the impact of variant histologies of urothelial carcinoma of the bladder (UCB) on oncologic outcomes after radical cystectomy (RC).Materials and MethodsData from 1984 UCB patients treated by RC without preoperative chemo- or radiotherapy were reviewed for histological differentiation and variants. We analysed the differences between pure UCB and UCB with variant histology, and those between the different histological variants using various stratifications.ResultsOverall, 488 (24.6%) patients had UCB variants with squamous cell (11.4%) and glandular differentiation (3.8%) being the most common. Histological UCB variants were associated with advanced tumour stage, lymphovascular invasion and lymph node metastasis (all p-values < 0.01) when compared to pure UCB. In univariable analyses, patients with non-squamous UCB variants were at significantly higher risk for disease recurrence and cancer-specific mortality than those with pure UCB patients (p-values = 0.001) and those with squamous cell differentiated UCB (p-values = 0.04); the latter two had the same risk. In multivariable analyses that adjusted for the effects of standard clinicopathologic characteristics, variant UCB histology was not associated with both survival end-points. In patients treated with adjuvant chemotherapy (n = 492) there was no difference in cancer-specific survival between pure UCB, squamous cell differentiated UCB and other histological UCB variants.ConclusionsA quarter of UCB patients treated with RC harboured histological UCB variants. Variant UCB histologies were associated with features of biologically aggressive disease. While variant UCB histology was associated with worse outcomes in univariable analyses, this effect did not remain significant in multivariable analyses.  相似文献   
997.
998.
Comorbidity between balance and anxiety disorders in adult population is a well-studied clinical entity. Children might be particularly prone to develop balance-anxiety comorbidity, but surprisingly they are practically neglected in this field of research. The consequence is that children are treated for what seems to be the primary disorder without noticing possible effects on the other disorder. In Study 1, children with balance dysfunction were compared to normally balanced controls on anxiety and self-esteem. In study 2, children with balance dysfunction were assigned to either balance training or a waiting-list control. Training consisted of 12 weekly sessions of balance treatment. Anxiety and self-esteem were tested before and after treatment/waiting. Study 1 confirmed significantly higher anxiety and lower self-esteem in the balance dysfunction group compared to the control group. Study 2 showed that treatment improved balance performance, reduced anxiety, and increased self-esteem relative to the control waiting list group. Taken together, the present findings are in accord with the observations of comorbidity between balance and anxiety disorders in adults and confirm their validity in children younger than 7 years of age. This profile of comorbidity between balance dysfunction and anxiety also include lower self-esteem.  相似文献   
999.
1000.
Determinants of quality of life for patients with kidney stones   总被引:1,自引:0,他引:1  
  相似文献   
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