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   1536篇
  免费   66篇
  国内免费   32篇
耳鼻咽喉   43篇
儿科学   76篇
妇产科学   33篇
基础医学   215篇
口腔科学   21篇
临床医学   91篇
内科学   374篇
皮肤病学   24篇
神经病学   182篇
特种医学   15篇
外科学   76篇
综合类   16篇
预防医学   113篇
眼科学   63篇
药学   208篇
中国医学   2篇
肿瘤学   82篇
  2022年   21篇
  2021年   23篇
  2020年   20篇
  2019年   22篇
  2018年   25篇
  2017年   18篇
  2016年   33篇
  2015年   40篇
  2014年   47篇
  2013年   76篇
  2012年   106篇
  2011年   113篇
  2010年   64篇
  2009年   49篇
  2008年   93篇
  2007年   102篇
  2006年   120篇
  2005年   126篇
  2004年   128篇
  2003年   111篇
  2002年   107篇
  2001年   6篇
  2000年   8篇
  1999年   16篇
  1998年   15篇
  1997年   9篇
  1996年   10篇
  1995年   11篇
  1994年   5篇
  1993年   8篇
  1992年   5篇
  1991年   6篇
  1990年   6篇
  1988年   7篇
  1987年   2篇
  1986年   4篇
  1985年   6篇
  1984年   6篇
  1983年   7篇
  1979年   6篇
  1978年   4篇
  1977年   9篇
  1976年   4篇
  1975年   4篇
  1974年   5篇
  1973年   3篇
  1971年   2篇
  1966年   2篇
  1965年   2篇
  1961年   2篇
排序方式: 共有1634条查询结果,搜索用时 125 毫秒
91.
BACKGROUND: In surgical treatment of morbid obesity, maintaining a restrictive anastomosis is key to long-range success. However, laparoscopic Roux-en-Y gastric bypass (LRYGB) may result in gastrojejunal (GJ) stricture, requiring treatment in up to 27% of patients. METHODS: This is a retrospective review of the outcome of 223 consecutive LRYGB patients. Patients developing stricture received standard endoscopic balloon dilation by the same surgeon. Stricture and nonstricture groups were compared for excess body weight loss (EBWL) at 1, 3, 6, and 12 months. RESULTS: GJ stricture requiring dilation occurred in 38 patients (17%). After dilation all patients were relieved of stricture symptoms and none required revision. By 12 months, patients with stricture had an EBWL of 86% compared with nonstrictured patients at 75%. CONCLUSION: Endoscopic balloon dilation is a safe and effective treatment option for GJ stricture. Improved weight loss occurred for patients with stricture requiring dilation.  相似文献   
92.
Recent HIV infection or divergent HIV or simian immunodeficiency virus (SIV) strains may be responsible for Western blot-indeterminate results on 70 serum samples from Zairian hospital employees that were reactive in an enzyme immunoassay. Using universal polymerase chain reaction HIV-1, HIV-2, and SIV primers, we detected 1 (1.4%) HIV-1 sequence. Except for 1 sample, no molecular evidence for unusual HIV- or SIV-like strains in this sampling was found.  相似文献   
93.
A total of 6193 patients treated for uterine cervix cancer was studied by a collaborative study, aiming to compare the applicability of the TNM versus FIGO clinical staging systems. Retrospective assays of gynecological status were performed. It was found that the FIGO classification system is superior to the TNM system concerning uterine cervix cancer in the aspects of simplicity, recording procedures, and prognostic value.  相似文献   
94.
Von 35 Kranken, bei denen der Verdacht auf prothetische Stomatopathien bestand, wurden durch die mykologische Untersuchung zahlreiche Candida albicans-Kolonien gefunden, besonders im Bereich der Prothesen, bei Anwesenheit von klinischen Veränderungen auf der Mundschleimhaut.
In der antimykotischen Therapie erwies sich Pimafucin in Form von Suspension 1 % als ein sehr wirksames Medikament.  相似文献   
95.
One of the problems in the stapes surgery is the floating footplate. The frequency of incidence of this complication is 2% to 5.8% of all operations. The authors present the results of stapes operations in a group of 28 cases (2.5%) from all the 1120 operations, in which the surgeon experienced a floating footplate. The hearing results were evaluated on the base of the average gain of air-conduction thresholds and air-bone gap levels at 500, 1000, 2000 and 3000 Hz. The improvement of hearing we observed in 24 patients, 4 patients heard worse.  相似文献   
96.
BACKGROUND: During the 2000-2001 season, an oculorespiratory syndrome (ORS) was identified in association with 1 manufacturer's influenza vaccine in Canada. ORS included bilateral red eyes, facial edema or respiratory symptoms beginning within 24 hours of influenza immunization. Few reports involved children. We assessed the rate of ORS in a pediatric cohort. METHODS: In February 2001, invitation to participate in an influenza vaccine safety survey was sent to the parents of children who attend a diabetes clinic. A questionnaire elicited influenza immunization history and adverse event experience beginning within 1 day of vaccination for the child with diabetes and up to 3 siblings. Follow-up telephone interviews collected information from those who failed to return a questionnaire by mail. RESULTS: Of the 959 households sent a questionnaire, 780 participated (81%). Among 780 children with diabetes, 418 (54%) received influenza vaccine in 2000. Adverse event experience was collected from an additional 242 immunized siblings. Among immunized children, 13% (95% confidence interval, 10-16%) experienced ORS, consisting primarily of respiratory symptoms. The majority (72%) resolved within 2 days. There was association between ORS and first time receipt of influenza vaccine (OR 2.7; 95% confidence interval, 1.6-4.4). Fewer parents of ORS-affected compared with unaffected children indicated that they were likely or very likely to have their child revaccinated (87 versus 97%; P < 0.001). CONCLUSIONS: In 2000-2001, children experienced ORS in Canada at a rate comparable with that of adults. ORS should be incorporated into influenza vaccine safety monitoring and discussed with parents, especially those contemplating influenza vaccine for their child for the first time.  相似文献   
97.
A 74-year old woman was admitted to the orthopaedic word due to femoral bone fracture. Six days later she was admitted to the intensive care unit because of the clinical signs of circulatory and respiratory failure. Because acute pulmonary embolism was suspected, transthoracic echocardiography was performed and showed typical signs of acute massive pulmonary embolism as well as a highly mobile, longitudinal, additional echo in the right atrium attached to the interatrial septum in the place of foramen ovale, prolapsing in the diastole into the right ventricle. The patient was immediately and successfully treated with thrombolysis. Treatment options in patients with acute pulmonary embolism and right atrial mobile thrombus are discussed.  相似文献   
98.
Monitoring of fibrosis process with the use of histopathologic studies on liver's bioptates is limited, so it is attempted to find reliable, obtained with less invasive methods, sensitive and reflecting fibrosis dynamics markers of this process. The aim of the study was simultaneously to assess liver's expression as well as circadian and mean daily TGF-betal concentration in serum of patients with chronic hepatitis type B in comparison to control group. Studies were performed on 50 patients (9 women, 41 men) aged 45.9 +/- 2.3 years with chronic hepatitis type B. Control group consisted of 20 patients (mean age 38.6 +/- 3.7 years), in which so called minimal changes without fibrosis were observed in histophatologic bioptate of liver. Blood for studies was collected every 4 houres during the day. Serum concentration of TGF-betal was assessed with the use of ELISA method, and expression of mRNA TGF-betal in liver with QRT-PCR method. No significant difference between circadian as well as mean daily serum TGF-betal concentration beetwen control group and the group with chronic hepatitis type B was shown. Increased expression of mRNA, TGF-betal in bioptate of liver of patients with chronic hepatitis type B in comparison to control group was noted. In "minimal changes" control group presence of significant positive correlation between expression of mRNA TGF-beta1 in liver and concentration of this cytokine in serum was shown, in the group of patients with chronic hepatitis B this connection was not noted.  相似文献   
99.
Some carriers of a "premutation" allele of the FMR1 gene develop late-onset tremor/ataxia. We conducted a magnetic resonance imaging volumetric study in an unselected sample of eight older male premutation carriers. Volumetric measures, including total brain volume, and the volumes of cerebrum, cerebellum, and cerebral cortex all were significantly reduced in premutation carriers compared with similar data from 21 age-matched normal controls. Total brain and cerebral volumes were significantly related to the number of CGG repeats in the FMR1 gene. Moreover, increased hippocampal volume indicates this premutation may account for both neurodegenerative and neurodevelopmental changes.  相似文献   
100.
Interactions between adenosine receptor ligands and dizocilpine (uncompetitive NMDA receptor antagonist) was studied in antinociceptive, writhing test in mice. Minimal effective, antinociceptive doses of adenosine receptor agonists were: 0.1 mg/kg (NECA--A1/A2 agonist). Generally, these agonists did not potentiate the subthreshold dose of dizocilpine (0.05 mg/kg). Of all adenosine receptor antagonists used, only caffeine (A2 and A2 antagonists) reversed dizocilpine-induced (0.1 mg/kg) antinociception dose-dependently. These findings indicate that dizocilpin-induced antinociception in the writhing test is only partly influenced by adenosine receptor ligands.  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