Early renal transplant dysfunction can be caused by acute rejection,acute tubular necrosis (ATN), infection, ciclosporin toxicity,bleeding, urethral obstruction, urinary leak, lymphocele andthrombosis [1]. Prompt treatment of early allograft dysfunctionis essential and therefore accurate diagnosis mandatory. Wedescribe a patient with an unusual cause of allograft dysfunction,which was resolved by a simple surgical intervention.   A 32-year-old man with congenital blindness, hypertension andend-stage renal disease underwent renal transplantation. Hehad been haemodialysis-dependant since the age of 24 years.Dialysis was performed through an  相似文献   
86.
87.
88.
89.
Prospective study of short stature and newly diagnosed asthma in women.     
Deborah P Jones  Carlos A Camargo  Frank E Speizer  R Graham Barr 《The Journal of asthma》2007,44(4):291-295
The authors tested the hypothesis that short stature predicts adult-onset asthma independent of obesity among women in the Nurses' Health Study. Height, weight, and physician-diagnosed asthma were assessed with validated questionnaire items. Proportional hazard models adjusted separately for weight and body mass index. The rate of newly diagnosed asthma was 1.55 times greater in the shortest versus the tallest quintile after adjustment for weight (95% CI, 1.26-1.91). After adjustment for body mass index, the rate ratio was 1.16 (95% CI, 0.94-1.42). Short stature predicted adult-onset asthma in a large cohort of women, but this association was not independent of obesity.  相似文献   
90.
Cutaneous leishmaniasis: Clinical report of two cases and review of the recent literature     
Eva Maria Valesky  Diamant Thai  Markus Meissner  Christian Beier  Manfred Wolter  Helmut Schfer  Roland Kaufmann 《Journal der Deutschen Dermatologischen Gesellschaft》2007,5(9):770-772
With 1–1.5 million cases reported every year cutaneous leishmaniasis represents an increasing health problem. The course of cutaneous leishmaniasis varies from a single self‐healing ulcer to a persistent ulcer or progressive mucosal disease with nasopharyngeal destruction. An enormous array of topical and systemic treatment modalities has been endorsed. The response to treatment depends on the species of parasite as well as the host's immunological and genetic status. Species‐specific treatment guidelines based on evidence from controlled studies are highly desirable. We present two cases of cutaneous leishmaniasis, one in a child and one during pregnancy, reviewing various diagnostic and therapeutic measures with special attention to problems in young and pregnant patients.  相似文献   
[首页] « 上一页 [4] [5] [6] [7] [8] 9 [10] [11] [12] [13] [14] 下一页 » 末  页»
  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   80498篇
  免费   5680篇
  国内免费   247篇
耳鼻咽喉   835篇
儿科学   2187篇
妇产科学   1670篇
基础医学   10673篇
口腔科学   2077篇
临床医学   7973篇
内科学   16484篇
皮肤病学   1383篇
神经病学   7669篇
特种医学   3646篇
外国民族医学   6篇
外科学   11552篇
综合类   853篇
一般理论   62篇
预防医学   7066篇
眼科学   1650篇
药学   5290篇
中国医学   142篇
肿瘤学   5207篇
  2023年   575篇
  2022年   477篇
  2021年   1276篇
  2020年   1154篇
  2019年   1436篇
  2018年   2081篇
  2017年   1844篇
  2016年   1979篇
  2015年   1945篇
  2014年   2476篇
  2013年   3922篇
  2012年   5518篇
  2011年   5896篇
  2010年   3092篇
  2009年   2445篇
  2008年   5012篇
  2007年   5138篇
  2006年   4953篇
  2005年   4717篇
  2004年   4407篇
  2003年   4279篇
  2002年   4098篇
  2001年   1529篇
  2000年   1690篇
  1999年   1256篇
  1998年   819篇
  1997年   671篇
  1996年   553篇
  1995年   558篇
  1994年   449篇
  1993年   412篇
  1992年   505篇
  1991年   474篇
  1990年   424篇
  1989年   462篇
  1988年   430篇
  1987年   418篇
  1986年   378篇
  1985年   460篇
  1984年   464篇
  1983年   414篇
  1982年   430篇
  1981年   383篇
  1980年   345篇
  1979年   313篇
  1978年   308篇
  1977年   267篇
  1976年   218篇
  1975年   224篇
  1974年   218篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
In the study presented here 26 recent Danish clinical isolates of prolyliminopeptidase (PIP)-negative Neisseria gonorrhoeae were phenotypically and genotypically characterized to investigate whether one or more PIP-negative strains are circulating in the Danish community. The profiles of these isolates were compared with those of three isolates from a recent outbreak of PIP-negative N. gonorrhoeae infection in the UK. Twenty-five of the Danish isolates and all three UK isolates had similar antibiograms and were designated serovar IB-4. Genotypic characterization by pulsed-field gel electrophoresis, porB1b gene sequencing, and opa-typing revealed that these isolates were indistinguishable or closely related. The results indicate that at least one PIP-negative N. gonorrhoeae strain is currently circulating in the Danish community, and this strain is indistinguishable from the one that caused an outbreak in the UK.An erratum to this article can be found at  相似文献   
82.
The atypical antipsychotic risperidone is often prescribed to pediatric patients with neuropsychiatric disorders, though its effects on the developing brain remain unclear. Accordingly, we studied the effects of repeated treatment of risperidone on dopamine receptors in brain regions of juvenile rat. Levels of dopamine receptors (D(1), D(2), D(3), D(4)) in forebrain regions of juvenile rats were quantified after 3 weeks of treatment with three different doses of risperidone (0.3, 1.0 and 3.0 mg/kg) and compared findings to those in adult rats treated with risperidone (3.0 mg/kg/day) previously. Risperidone (at 1.0 and 3.0 mg/kg/day) increased levels of D(1) receptors in nucleus accumbens and caudate-putamen of juvenile, but not adult rats. Conversely, all three doses of risperidone dose-dependently increased D(2) labeling in medial prefrontal cortex and hippocampus, and D(4) receptor in nucleus accumbens, caudate-putamen and hippocampus of juvenile animals as well as in adults. Only the high dose of risperidone (3.0 mg/kg) increased D(2) receptors in caudate-putamen in both juvenile and adult brain. D(3) receptors were not altered by risperidone in any brain region at any dose or age. The findings indicate dose-dependent effects of risperidone on dopamine receptors in developing animals, and that juvenile animals are more sensitive than adults to the cerebral effects of risperidone.  相似文献   
83.
PURPOSE: To evaluate qualitative wall motion assessment vs. quantitative wall thickening for the assessment of subtle changes in myocardial systolic function using cine MRI. METHODS: Cine MR images were obtained in 5 canines with a significant coronary artery stenosis and in 2 controls on a 1.5T scanner. Qualitative results were obtained using a numerical scoring system; quantitative analysis was performed using a semi-automatic segmentation program. The techniques were matched and compared using Spearman correlations. RESULTS: All correlations in the experimental group revealed significant but weak to moderate relationships between the qualitative and quantitative results (e.g., at-risk tissue rho = 0.363, p < 0.0001; remote tissue rho = 0.275, p = 0.0002), with each identifying changes in regional function that ensued following creation of the stenosis. Intra-observer variability was reasonable in both methods when repeat analysis on a subset of the data was performed, with both techniques showing a significant correlation between the repeated measurements (quantitative - rho = 0.52, p < 0.0001; qualitative - rho = 0.54, p < 0.0001). CONCLUSION: Both methods were able to detect very limited wall motion abnormalities present in the canines with significant stenosis and either method gives comparable results.  相似文献   
84.
PURPOSE: Educational interventions to reduce the use of abbreviations and dosage designations that were deemed unsafe at a level 1 trauma center are described. SUMMARY: Strategies to reduce the use of unsafe abbreviations at Detroit Receiving Hospital were studied. Six abbreviations and dosage designations were deemed as unsafe by the site's medication-use and patient medical safety committees: (1) U for units, (2) microg for microgram, (3) TIW for three times a week, (4) the degree symbol for hour, (5) trailing zeros after a decimal point, and (6) the lack of leading zeros before a decimal point. Data on abbreviation use was collected starting in September 2003 by examining copies of patients' order sheets, which are sent from nursing units to the pharmacy for processing. Data were collected during three 24-hour periods each month, with 7-10 days between each period. A data collection sheet was developed to assist in documenting the number of opportunities for each unsafe abbreviation and the actual incidence of each. Educational strategies were developed and implemented starting in October 2003 to decrease the use of the unsafe abbreviations. These strategies included inservice education programs for the medical, pharmacy, and nursing staffs; laminated pocket cards; patient chart dividers; stickers; and interventions by pharmacists and nurses during medication prescribing. During the eight-month evaluation period, 20,160 orders were reviewed, representing 27,663 opportunities to use a designated unsafe abbreviation. Educational interventions successfully reduced the overall incidence of unsafe abbreviations from 19.69% to 3.31%. CONCLUSION: Educational interventions markedly reduced the use of unsafe abbreviations in medication orders over an eight-month evaluation period.  相似文献   
85.
   Introduction    Case report
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