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   102824篇
  免费   8053篇
  国内免费   4864篇
耳鼻咽喉   504篇
儿科学   2375篇
妇产科学   623篇
基础医学   8817篇
口腔科学   703篇
临床医学   12914篇
内科学   8452篇
皮肤病学   321篇
神经病学   18836篇
特种医学   6767篇
外国民族医学   7篇
外科学   15751篇
综合类   17396篇
现状与发展   4篇
一般理论   1篇
预防医学   4552篇
眼科学   1084篇
药学   9372篇
  47篇
中国医学   4212篇
肿瘤学   3003篇
  2024年   236篇
  2023年   1572篇
  2022年   2401篇
  2021年   4250篇
  2020年   3870篇
  2019年   3189篇
  2018年   3144篇
  2017年   3544篇
  2016年   3736篇
  2015年   3691篇
  2014年   6349篇
  2013年   7583篇
  2012年   6042篇
  2011年   6550篇
  2010年   5639篇
  2009年   5307篇
  2008年   5382篇
  2007年   5435篇
  2006年   5094篇
  2005年   4482篇
  2004年   3566篇
  2003年   3316篇
  2002年   2706篇
  2001年   2408篇
  2000年   1935篇
  1999年   1674篇
  1998年   1465篇
  1997年   1476篇
  1996年   1189篇
  1995年   986篇
  1994年   894篇
  1993年   675篇
  1992年   634篇
  1991年   504篇
  1990年   464篇
  1989年   418篇
  1988年   390篇
  1987年   342篇
  1986年   390篇
  1985年   484篇
  1984年   452篇
  1983年   293篇
  1982年   358篇
  1981年   320篇
  1980年   293篇
  1979年   166篇
  1978年   108篇
  1977年   92篇
  1976年   87篇
  1975年   45篇
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
81.
目的:分析脾保留手术治疗创伤性脾破裂的疗效。方法选取该院2011年6月—2014年6月收治的创伤性脾破裂患者,共计56例,分为两组,各28例,对照组进行脾切除手术,研究组进行脾保留手术。结果研究组临床有效率为92.86%,对照组临床有效率为78.57%;术后并发症发生率研究组为10.71%、对照组为28.57%。结论脾保留手术治疗创伤性脾破裂的疗效显著,恢复快,并发症少,在患者伤情允许情况下优先选择脾保留术。  相似文献   
82.
Introduction: This study investigated variables associated with subjective decline in executive function among Veterans of Operations Enduring Freedom, Iraqi Freedom, and New Dawn (OEF/OIF/OND) following a history of blast-related mild traumatic brain injury (mTBI).

Method: Fifty-six male U.S. Veterans (MAge = 35.3 ± 8.8 years) with a history of blast-related mTBI (6.6 ± 3.2 years post injury) completed a battery of self-report questionnaires and neuropsychological measures. Participants rated current and retrospectively estimated pre-mTBI executive function difficulties on the Frontal Systems Behavior Scale (FrSBe). A difference score (post- minus pre-mTBI ratings) was the dependent variable (?FrSBe). Linear regression models examined variables predicting ?FrSBe, including: pre-injury characteristics (education, premorbid intelligence), injury-related characteristics (number of blast exposures, losses of consciousness), post-injury clinical symptoms (PTSD Checklist–Military version; Pittsburgh Sleep Quality Index), and post-injury neuropsychological performances on executive function measures (Trail Making Test Part B; Controlled Oral Word Association Test; Auditory Consonant Trigrams; Wisconsin Card Sorting Test).

Results: While 11% of participants had a clinically elevated pre-injury FrSBe total score, 82% had a clinically elevated post-injury FrSBe total score. Only self-reported PTSD symptom severity independently predicted perceived change in executive function.

Conclusions: Many OEF/OIF/OND Veterans with a history of blast-related mTBI experience subjective decline in executive function following injury. Perceived executive function decline was associated with higher PTSD symptom severity, aligning with previous research associating PTSD with cognitive complaints. Results did not support a correspondence between perceived cognitive change and neuropsychological performances.  相似文献   
83.
84.
85.
86.
87.
Imaging the infant brain with MRI has improved our understanding of early neurodevelopment. However, head motion during MRI acquisition is detrimental to both functional and structural MRI scan quality. Though infants are typically scanned while asleep, they commonly exhibit motion during scanning causing data loss. Our group has shown that providing MRI technicians with real-time motion estimates via Framewise Integrated Real-Time MRI Monitoring (FIRMM) software helps obtain high-quality, low motion fMRI data. By estimating head motion in real time and displaying motion metrics to the MR technician during an fMRI scan, FIRMM can improve scanning efficiency. Here, we compared average framewise displacement (FD), a proxy for head motion, and the amount of usable fMRI data (FD ≤ 0.2 mm) in infants scanned with (n = 407) and without FIRMM (n = 295). Using a mixed-effects model, we found that the addition of FIRMM to current state-of-the-art infant scanning protocols significantly increased the amount of usable fMRI data acquired per infant, demonstrating its value for research and clinical infant neuroimaging.  相似文献   
88.
Acute lung injury (ALI) is a major cause of sepsis-induced acute respiratory failure. Emodin has been considered to play a protective role for acute lung edema in cecal ligation and puncture (CLP)-induced sepsis model. In this study we aimed to investigate whether emodin could improve CLP-induced lung sepsis via regulating aquaporin (AQP) and tight junction (TJ), inflammatory factors, and pulmonary apoptosis. The results showed that sepsis-induced pulmonary pathological changes were significantly improved after emodin treatment. Emodin was found to upregulate AQP and TJ expression in the CLP model. Meanwhile, inflammatory cytokine release and pulmonary apoptosis was remarkably reduced after emodin treatment in lung sepsis. Our data demonstrated that emodin could suppresse inflammation, restore pulmonary epithelial barrier and reduce mortality in CLP-induced ALI, suggesting the potential therapeutic application of emodin in sepsis.  相似文献   
89.
90.
PurposeInjuries of both pelvic ring and acetabulum as rare very few articles are available in literature. There are no set protocols in defining the injury let alone defining early and definitive management strategies. This article is an attempt to encompass all available data to give us guidelines in managing these injuries.MethodsAn extensive literature review was carried out on PubMed/Medline, google scholar and Embase databases was done with the eligibility criteria of 1) Case series with a minimum of 20 cases. 2) The patient’s outcome reported. 3) Full article available. 4) Article in English. 5) Minimum Jadad score of 3. As per PRISMA guidelines the search was done and gradually filtered down to relevant articles which were 8 in number.ResultsThe incidence of these injuries range from 5 to 16%. The transverse acetabular fracture pattern is the commonest followed by associated both column fractures. There is equal propensity of Anteroposterior compression and lateral compression injuries. The injury mechanism appears to transmitted lateral force from the greater trochanter inwards with an implosion injury causing acetabular and pelvic injury as a continuum. The initial management is similar to managing pelvic ring injuries with focus on patient resuscitation, hemodynamic stabilization and temporary stabilization. The injury severity score and the mortality rates are comparable to isolated unstable pelvic ring injuries. Definitive management focuses on fixing the posterior pelvic ring first followed by the acetabular fracture and then the anterior pelvic ring. The displacement rates and outcome is worse than isolated acetabular injuries or pelvic injuries.ConclusionCombined Pelvic and acetabular injuries are complex injuries which need to be managed initially as we manage pelvic injury and later as we fix as an acetabular fracture meticulously.  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