全文获取类型
收费全文 | 199809篇 |
免费 | 49136篇 |
国内免费 | 472篇 |
专业分类
耳鼻咽喉 | 2870篇 |
儿科学 | 7348篇 |
妇产科学 | 2787篇 |
基础医学 | 30889篇 |
口腔科学 | 7259篇 |
临床医学 | 25771篇 |
内科学 | 46602篇 |
皮肤病学 | 8942篇 |
神经病学 | 25812篇 |
特种医学 | 6781篇 |
外国民族医学 | 3篇 |
外科学 | 33649篇 |
综合类 | 1769篇 |
一般理论 | 156篇 |
预防医学 | 15053篇 |
眼科学 | 3810篇 |
药学 | 13534篇 |
中国医学 | 1123篇 |
肿瘤学 | 15259篇 |
出版年
2023年 | 666篇 |
2022年 | 1101篇 |
2021年 | 3623篇 |
2020年 | 6415篇 |
2019年 | 12981篇 |
2018年 | 12806篇 |
2017年 | 13301篇 |
2016年 | 14106篇 |
2015年 | 14277篇 |
2014年 | 15501篇 |
2013年 | 17568篇 |
2012年 | 12639篇 |
2011年 | 12938篇 |
2010年 | 13885篇 |
2009年 | 9845篇 |
2008年 | 10134篇 |
2007年 | 9285篇 |
2006年 | 9039篇 |
2005年 | 8477篇 |
2004年 | 8346篇 |
2003年 | 7639篇 |
2002年 | 7269篇 |
2001年 | 2483篇 |
2000年 | 2167篇 |
1999年 | 1891篇 |
1998年 | 1562篇 |
1997年 | 1209篇 |
1996年 | 1058篇 |
1995年 | 963篇 |
1994年 | 846篇 |
1993年 | 862篇 |
1992年 | 1106篇 |
1991年 | 1047篇 |
1990年 | 935篇 |
1989年 | 911篇 |
1988年 | 852篇 |
1987年 | 874篇 |
1986年 | 778篇 |
1985年 | 822篇 |
1984年 | 704篇 |
1983年 | 604篇 |
1982年 | 575篇 |
1981年 | 488篇 |
1980年 | 426篇 |
1979年 | 465篇 |
1978年 | 338篇 |
1977年 | 315篇 |
1976年 | 306篇 |
1974年 | 302篇 |
1973年 | 307篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Mark R Katlic 《European journal of cardio-thoracic surgery》2006,30(3):529-532
OBJECTIVE: Video-assisted thoracic surgery (VATS) is usually performed with general anesthesia and double-lumen endotracheal intubation, but minor procedures have been carried out with patients spontaneously breathing and with epidural or regional analgesia. We have broadened our indications for VATS utilizing purely local anesthesia and sedation. METHODS: The medical records of all patients undergoing VATS under local anesthesia and sedation at Geisinger Wyoming Valley Medical Center between 7/1/02 and 6/1/06 were reviewed. All procedures were performed in the operating room with patients in full lateral position; no patient had endotracheal intubation or epidural or nerve block analgesia. RESULTS: One hundred and fifteen patients, ranging in age from 21 to 88 years and in size from 40 to 172 kg, underwent 126 video-assisted thoracic operations: pleural biopsy/effusion drainage with or without talc 81, drainage of empyema 21, lung biopsy 18, evacuate hemothorax 3, pericardial window 2, biopsy chest wall mass 1. No patient required intubation or conversion to thoracotomy. Three patients who underwent lung biopsy died of their underlying disease (cytomegalovirus and pneumocystis, primary amyloidosis, metastatic cancer to contra-lateral lung) on postoperative days 18, 14, and 4, respectively. One patient developed transient renal insufficiency attributed to ketorolac. CONCLUSION: VATS utilizing local anesthesia and sedation is well tolerated, safe, and valuable for an increasing number of indications. 相似文献
23.
Steven M Shechter Andrew J Schaefer R Scott Braithwaite Mark S Roberts 《Medical decision making》2006,26(5):550-553
The authors discuss techniques for Monte Carlo (MC) cohort simulations that reduce the number of simulation replications required to achieve a given degree of precision for various output measures. Known as variance reduction techniques, they are often used in industrial engineering and operations research models, but they are seldom used in medical models. However, most MC cohort simulations are well suited to the implementation of these techniques. The authors discuss the cost of implementation versus the benefit of reduced replications. 相似文献
24.
25.
26.
PURPOSE: The aim of this study was to determine the reproducibility of measurements made using the Sonogage Corneo-Gage Plus 2 (Cleveland, Ohio) ultrasound pachymeter of total corneal and corneal epithelial thickness in 5 different regions of the cornea. METHODS: Twenty-seven subjects at the New England College of Optometry (NECO) and 20 subjects at the Southern College of Optometry (SCO) were enrolled in this study. Measurements were taken of the central cornea as well as the nasal and temporal regions of the midperipheral and peripheral regions of the right cornea of each subject. Identical measurements were again taken in these subjects 1 week later at approximately the same time of day. Within-subject variations were then assessed using paired t tests. RESULTS: The only significant measurement differences that were found between visits were for full corneal thickness at both the nasal and temporal midperipheral locations. The mean differences for these locations were 13.5 microm and 13.7 microm, respectively. CONCLUSIONS: Epithelial corneal thickness and central and peripheral total corneal thickness measurements using the Corneo-Gage Plus 2 pachymeter were reproducible; however, midperipheral total corneal thickness measurements showed poor reproducibility. 相似文献
27.
Elhaji Youssef A.; Stoica Ileana; Dennis Sheldon; Purisima Enrico O.; Lumbroso Rose; Beitel Lenore K.; Trifiro Mark A. 《Human molecular genetics》2006,15(9):1561
Human Molecular Genetics (2006) 15, 921931; 相似文献
28.
29.
Abstract: Background: Identification of risk drinking in expectant fathers may be helpful as an important part of efforts to minimize maternal alcohol use, and as an opportunity to inform them about a problematic practice during a critical developmental stage for the couple. The purpose of this study was to evaluate the T‐ACE screening questionnaire, which asks about t olerance to alcohol, being a nnoyed by other's comments about drinking, attempts to c ut down, and having a drink first thing in the morning (“ e ye‐opener”), in the male partners of pregnant women who themselves were T‐ACE positive. Methods: Two hundred fifty‐four male partners were asked to complete the T‐ACE embedded in a health survey, the Alcohol Use Disorders Identification Test (AUDIT), and other questions about their alcohol use in the past 30 days when their pregnant partners had a median gestation of 11.5 weeks (T1). After delivery, male partners again completed the T‐ACE and quantity‐frequency questions (T2). The predictive ability of the T‐ACE and AUDIT was compared, using risk drinking (>4 drinks/day or >14 drinks/week) as the criterion standard. Results: A substantial minority of male partners had risk drinking, 31 percent at T1 and 25 percent at T2. Although the AUDIT was better than the T‐ACE as an independent predictor of risk drinking, the latter was most accurate when the tolerance threshold exceeded 2 drinks, the same established for pregnant women. The sensitivity (T1 = 84.6%, T2 = 82.8%) and specificity (T1 = 43.8%, T2 = 51.1%) of the T‐ACE at this threshold compared favorably with those of the AUDIT at the standard cut point of 8. Conclusions: The T‐ACE may be a practical way for clinicians to identify risk drinking in both pregnant women and expectant fathers. (BIRTH 33:2 June 2006) 相似文献
30.