全文获取类型
| 收费全文 | 2288581篇 |
| 免费 | 170776篇 |
| 国内免费 | 3361篇 |
专业分类
| 耳鼻咽喉 | 31624篇 |
| 儿科学 | 75756篇 |
| 妇产科学 | 65894篇 |
| 基础医学 | 337287篇 |
| 口腔科学 | 64567篇 |
| 临床医学 | 205567篇 |
| 内科学 | 444944篇 |
| 皮肤病学 | 48524篇 |
| 神经病学 | 181842篇 |
| 特种医学 | 87305篇 |
| 外国民族医学 | 602篇 |
| 外科学 | 339591篇 |
| 综合类 | 48193篇 |
| 现状与发展 | 4篇 |
| 一般理论 | 825篇 |
| 预防医学 | 180231篇 |
| 眼科学 | 52314篇 |
| 药学 | 171636篇 |
| 7篇 | |
| 中国医学 | 4093篇 |
| 肿瘤学 | 121912篇 |
出版年
| 2018年 | 22857篇 |
| 2016年 | 19259篇 |
| 2015年 | 22350篇 |
| 2014年 | 30840篇 |
| 2013年 | 47152篇 |
| 2012年 | 64393篇 |
| 2011年 | 68855篇 |
| 2010年 | 40256篇 |
| 2009年 | 38427篇 |
| 2008年 | 65772篇 |
| 2007年 | 70833篇 |
| 2006年 | 71124篇 |
| 2005年 | 69724篇 |
| 2004年 | 67081篇 |
| 2003年 | 64463篇 |
| 2002年 | 63176篇 |
| 2001年 | 100154篇 |
| 2000年 | 102573篇 |
| 1999年 | 86962篇 |
| 1998年 | 25059篇 |
| 1997年 | 22488篇 |
| 1996年 | 22945篇 |
| 1995年 | 21765篇 |
| 1994年 | 20505篇 |
| 1993年 | 19022篇 |
| 1992年 | 70060篇 |
| 1991年 | 69106篇 |
| 1990年 | 67834篇 |
| 1989年 | 65720篇 |
| 1988年 | 61244篇 |
| 1987年 | 60133篇 |
| 1986年 | 57349篇 |
| 1985年 | 54618篇 |
| 1984年 | 41158篇 |
| 1983年 | 35851篇 |
| 1982年 | 21480篇 |
| 1981年 | 19328篇 |
| 1979年 | 39494篇 |
| 1978年 | 28361篇 |
| 1977年 | 24107篇 |
| 1976年 | 22579篇 |
| 1975年 | 24627篇 |
| 1974年 | 29478篇 |
| 1973年 | 28702篇 |
| 1972年 | 27250篇 |
| 1971年 | 25401篇 |
| 1970年 | 23808篇 |
| 1969年 | 22733篇 |
| 1968年 | 21310篇 |
| 1967年 | 18980篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
121.
122.
123.
124.
E. Likotrafiti K. M. Tuohy G. R. Gibson R. A. Rastall 《International journal of food sciences and nutrition》2016,67(2):83-91
The aim of the present study was to evaluate the antimicrobial activity of two synbiotic combinations, Lactobacillus fermentum with short-chain fructooligosaccharides (FOS-LF) and Bifidobacterium longum with isomaltooligosaccharides (IMO-BL), against enterohaemorrhagic Escherichia coli O157:H7 and enteropathogenic E. coli O86. Antimicrobial activity was determined (1) by co-culturing the synbiotics and pathogens in batch cultures, and (2) with the three-stage continuous culture system (gut model), inoculated with faecal slurry from an elderly donor. In the co-culture experiments, IMO-BL was significantly inhibitory to both E. coli strains, while FOS-LF was slightly inhibitory or not inhibitory. Factors other than acid production appeared to play a role in the inhibition. In the gut models, both synbiotics effectively inhibited E. coli O157 in the first vessel, but not in vessels 2 and 3. E. coli O86 was not significantly inhibited. 相似文献
125.
126.
127.
Stelter K. Theodoraki M. N. Becker S. Tsekmistrenko V. Olzowy B. Ledderose G. 《European archives of oto-rhino-laryngology》2015,272(3):639-639
European Archives of Oto-Rhino-Laryngology - 相似文献
128.
129.
Dan Azagury Tara E Mokhtari Luis Garcia Ulysses S Rosas Trit Garg Homero Rivas John Morton 《Surgery》2019,165(3):565-570
Background
Laparoscopic Roux-en-Y gastric bypass, laparoscopic sleeve gastrectomy, and laparoscopic adjustable gastric banding all lead to substantial weight loss in obese patients. Long-term weight loss can be highly variable beyond 1-year postsurgery. This study examines and compares the frequency distribution of weight loss and lack of treatment effect rates after laparoscopic Roux-en-Y gastric bypass, laparoscopic sleeve gastrectomy, and laparoscopic adjustable gastric banding.Methods
A total of 1,331 consecutive patients at a single academic institution were reviewed from a prospectively collected database. Preoperative data collected included demographics, body mass index, and percent excess weight loss. Postoperative BMI and %EWL were collected at 12, 24, and 36 months. Percent excess weight loss was analyzed by the percentiles of excess weight lost, and the distribution of percent excess weight loss was evaluated in 10% increments. Lack of a successful treatment effect was defined as <25% excess weight loss.Results
Of the 1,331 patients, 72.4% (963) underwent laparoscopic Roux-en-Y gastric bypass, 18.3% (243) laparoscopic sleeve gastrectomy, and 9.4%(125) laparoscopic adjustable gastric banding. Mean percent excess weight loss was greatest for laparoscopic Roux-en-Y gastric bypass, followed by laparoscopic sleeve gastrectomy, and then by laparoscopic adjustable gastric banding at every time point: at 2 years mean percent excess weight loss was 77.9± 24.4 for laparoscopic Roux-en-Y gastric bypass, 50.8 ± 25.8 for laparoscopic sleeve gastrectomy, and 40.8± 25.9 for laparoscopic adjustable gastric banding (P < .0001). The rates of a successful treatment effect s for laparoscopic Roux-en-Y gastric bypass, laparoscopic sleeve gastrectomy, and laparoscopic adjustable gastric banding were 0.9%, 5.2%, and 24.3% at 1 year; 0.3%, 11.1%, and 26.0% at 2 years; and 1.0%, 25.3%, and 30.2% at 3 years. At 1 year, the odds ratio of lack of a successful treatment effect of laparoscopic sleeve gastrectomy versus laparoscopic Roux-en-Y gastric bypass was 6.305 (2.125–19.08; P?=?.0004), the odds ratio for laparoscopic adjustable gastric banding versus laparoscopic Roux-en-Y gastric bypass was 36.552 (15.64–95.71; P < .0001), and the odds ratio for laparoscopic adjustable gastric banding versus laparoscopic sleeve gastrectomy was 5.791 (2.519–14.599; P < .0001). At 2 years, the odds ratio for laparoscopic sleeve gastrectomy versus laparoscopic Roux-en-Y gastric bypass increased to 70.7 (9.4–531.7; P < .0001), the odds ratio for laparoscopic adjustable gastric banding versus laparoscopic Roux-en-Y gastric bypass increased to 128.1 (16.8–974.3; P < .0001), and the odds ratio for laparoscopic adjustable gastric banding versus laparoscopic sleeve gastrectomy decreased to 1.8 (0.9–3.6; P?=?.09).Conclusion
This study emphasizes the existing variability in weight loss across bariatric procedures as well as in the lack of a treatment effect for each procedure. Although laparoscopic adjustable gastric banding has the greatest rate of a lack of a successful treatment effect, the rate remained stable over 3 years postoperatively. Laparoscopic sleeve gastrectomy showed a doubling in the rate of a lack of a successful treatment effect every year reaching 25% at year 3. The rates for lack of a successful treatment effect for laparoscopic Roux-en-Y gastric bypass remained stable at about 1% for the first 3 years postoperatively. 相似文献130.
F. Giovanardi F. Nudo Q. Lai M. Garofalo A. Consolo E. Choppin De Janvry G.A. Arroyo Murillo P. Ursi D. Stabile F. Melandro P.B. Berloco R. Pretagostini L. Poli 《Transplantation proceedings》2019,51(1):128-131