全文获取类型
收费全文 | 64185篇 |
免费 | 4554篇 |
国内免费 | 211篇 |
专业分类
耳鼻咽喉 | 799篇 |
儿科学 | 1411篇 |
妇产科学 | 844篇 |
基础医学 | 8175篇 |
口腔科学 | 956篇 |
临床医学 | 6823篇 |
内科学 | 13939篇 |
皮肤病学 | 789篇 |
神经病学 | 6407篇 |
特种医学 | 2189篇 |
外国民族医学 | 5篇 |
外科学 | 11479篇 |
综合类 | 627篇 |
一般理论 | 47篇 |
预防医学 | 4375篇 |
眼科学 | 1234篇 |
药学 | 4417篇 |
中国医学 | 71篇 |
肿瘤学 | 4363篇 |
出版年
2024年 | 64篇 |
2023年 | 500篇 |
2022年 | 875篇 |
2021年 | 2011篇 |
2020年 | 1211篇 |
2019年 | 1799篇 |
2018年 | 2189篇 |
2017年 | 1535篇 |
2016年 | 1635篇 |
2015年 | 1878篇 |
2014年 | 2705篇 |
2013年 | 3367篇 |
2012年 | 5256篇 |
2011年 | 5458篇 |
2010年 | 2931篇 |
2009年 | 2696篇 |
2008年 | 4388篇 |
2007年 | 4478篇 |
2006年 | 4272篇 |
2005年 | 4073篇 |
2004年 | 3634篇 |
2003年 | 3473篇 |
2002年 | 3097篇 |
2001年 | 434篇 |
2000年 | 322篇 |
1999年 | 389篇 |
1998年 | 618篇 |
1997年 | 481篇 |
1996年 | 379篇 |
1995年 | 326篇 |
1994年 | 291篇 |
1993年 | 271篇 |
1992年 | 203篇 |
1991年 | 162篇 |
1990年 | 128篇 |
1989年 | 110篇 |
1988年 | 114篇 |
1987年 | 96篇 |
1986年 | 90篇 |
1985年 | 81篇 |
1984年 | 119篇 |
1983年 | 97篇 |
1982年 | 109篇 |
1981年 | 99篇 |
1980年 | 113篇 |
1979年 | 46篇 |
1978年 | 48篇 |
1977年 | 46篇 |
1976年 | 33篇 |
1974年 | 32篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Christopher L. Knight MD Henry A. Sakowski MD Bruce L. Houghton MD Mary B. Laya MD MPH Dawn E. DeWitt MD MSc 《Journal of general internal medicine》2004,19(5P2):594-598
The World Wide Web creates new challenges and opportunities for medical educators. Prominent among these are the lack of consistent standards by which to evaluate web-based educational tools. We present the instrument that was used to review web-based innovations in medical education submissions to the 2003 Society of General Internal Medicine (SGIM) national meeting, and discuss the process used by the SGIM web-based clinical curriculum interest group to develop the instrument. The 5 highest-ranked submissions are summarized with commentary from the reviewers. 相似文献
102.
103.
104.
Christopher R Pryce Andrea C Dettling Marianne Spengler Christian R Schnell Joram Feldon 《Neuropsychopharmacology》2004,56(2):72-79
BACKGROUND: Early environment is a major determinant of long-term mental health, evidenced by the relationship between early-life neglect or abuse and chronically increased vulnerability to developmental psychopathology, including major depressive disorder (MDD). Animal studies can increase understanding of environmentally mediated causal risk processes. We describe how daily deprivation of biological parenting in primate infants disrupts development of homeostatic and reward systems central to MDD. METHODS: Nine breeding pairs of marmoset monkeys provided control twins (CON) and early-deprived twins (ED); the latter were socially isolated for 30-120 min/day on days 2-28. During the first year of life, basal urinary norepinephrine (NE) titers and cardiophysiologic activity were measured. At the end of year 1 (adolescence), automated neuropsychologic tests were conducted to measure responsiveness to changes in stimulus-reward association (simple/reversed visual discrimination learning) and to reward per se (progressive ratio [PR] reinforcement schedule). RESULTS: The ED monkeys exhibited increased basal urinary NE titers and increased systolic blood pressure relative to CON siblings. The ED monkeys required more sessions to reinstate stimulus-oriented behavior following reversal, suggesting increased vulnerability to perceived loss of environmental control; ED monkeys also performed less PR operant responses, indicating that reward was less of an incentive and that they were mildly anhedonic relative to CON. CONCLUSIONS: In marmoset monkeys, neglect-like manipulation of ED leads to chronic changes in homeostatic systems, similar to those in children and adolescents exposed to early-life adversity and in MDD, and to responses to environmental stimuli similar to those that characterize MDD. 相似文献
105.
106.
Atul K Madan Constantine T Frantzides Christopher L Tebbit William C Park Nakka V Aruna Kumari Nina Shervin 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2004,8(2):191-193
BACKGROUND: Laparoscopic suturing and tying constitute advanced minimally invasive surgery skills. Developing proficiency in the standard methods with needle drivers is often an arduous process. Recent advances in laparoscopic instrumentations has allowed for easier methods of suturing and tying. This study investigated the hypothesis that the use of a specialized suturing device and a specialized tying device allows inexperienced medical students to suture and tie laparoscopically. METHODS: Preclinical medical students who had not received any training in open or laparoscopic surgery were included in this investigation. Each student was given a 5-minute demonstration of a specialized suturing device and a specialized tying device. The medical students were not allowed to deploy either device before actual use. After the demonstration, each student was given the device to use in a porcine model. Times were recorded and a subjective grade was given for each student. RESULTS: Twenty medical students were involved in this study. All medical students were able to complete the task of suturing and tying. The average time to suture was 104.6 seconds and the average time to tying was 31.2 seconds. The average subjective performance grade was 90 (out of 100). CONCLUSION: Specialized devices are easy to learn and use for laparoscopic suturing and tying with minimal instruction even for inexperienced medical students. Even surgeons who are not well versed in laparoscopic surgery should be able to suture and tie with certain laparoscopic instruments. 相似文献
107.
108.
Jason P. Glover DPM Christopher F. Hyer DPM Gregory C. Berlet MD Thomas H. Lee MD 《The Journal of foot and ankle surgery》2008,47(3):237-242
In our retrospective study, we report the objective results of the Mau osteotomy in the treatment of hallux valgus. We reviewed the results of 24 cases of moderate to severe hallux valgus deformities corrected with the Mau osteotomy of the first metatarsal combined with a distal soft-tissue procedure. Follow-up was possible in 24 cases. Preoperatively the mean hallux valgus and first intermetatarsal angles were 31.3 degrees and 16.6 degrees respectively, and were corrected postoperatively to an average of 13.00 degrees+/-7.15 degrees and 9.80 degrees+/-2.43 degrees respectively (P< .001). In the sagittal plane, the first metatarsal was shortened by an average of 2.00 mm. Two (8.3%) cases had dorsal elevation of the osteotomy fragment. Complications included 3 recurrences of the deformity, 1 frank nonunion, 8 dorsal cortical nonunions, 5 cases of undercorrection, and 1 case of broken hardware that was present in the nonunion that went on to revision. There were no superficial or deep infections, and no cases of transfer metatarsalgia were noted. In this series, the use of an oblique first metatarsal osteotomy with a dorsal shelf resulted in reliable and powerful correction of the first intermetatarsal angle in patients with moderate to severe hallux valgus. Particular attention should be paid to severe IM angles and the possibility of undercorrections. Despite ambulation postoperatively, the Mau osteotomy minimized dorsal malunion and the incidence of transfer metatarsalgia. LEVEL OF CLINICAL EVIDENCE: 4. 相似文献
109.
110.
Neuropsychological assessment, neuroimaging, and neuropsychiatric evaluation in pediatric and adult patients with sickle cell disease (SCD)
下载免费PDF全文
![点击此处可从《Neuropsychiatric Disease and Treatment》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Christopher L Edwards Renee Dunn Raynor Miriam Feliu Camela McDougald Stephanie Johnson Donald Schmechel Mary Wood Gary G Bennett Patrick Saurona Melanie Bonner Chante Wellington Laura M DeCastro Elaine Whitworth Mary Abrams Patrick Logue Lekisha Edwards Salutario Martinez Keith E Whitfield 《Neuropsychiatric Disease and Treatment》2007,3(6):705-709
Traditionally, neuropsychological deficits due to Sickle Cell Disease (SCD) have been understudied in adults. We have begun to suspect, however, that symptomatic and asymptomatic Cerebrovascular Events (CVE) may account for an alarming number of deficits in this population. In the current brief review, we critically evaluated the pediatric and adult literatures on the neurocognitive effects of SCD. We highlighted the studies that have been published on this topic and posit that early detection of CVE via neurocognitive testing, neuropsychiatric evaluations, and neuroimaging may significantly reduce adult cognitive and functional morbidities. 相似文献