全文获取类型
收费全文 | 7624篇 |
免费 | 641篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 73篇 |
儿科学 | 253篇 |
妇产科学 | 148篇 |
基础医学 | 1091篇 |
口腔科学 | 273篇 |
临床医学 | 692篇 |
内科学 | 1447篇 |
皮肤病学 | 75篇 |
神经病学 | 1026篇 |
特种医学 | 142篇 |
外科学 | 977篇 |
综合类 | 112篇 |
一般理论 | 14篇 |
预防医学 | 748篇 |
眼科学 | 143篇 |
药学 | 706篇 |
中国医学 | 20篇 |
肿瘤学 | 345篇 |
出版年
2023年 | 50篇 |
2022年 | 54篇 |
2021年 | 153篇 |
2020年 | 110篇 |
2019年 | 120篇 |
2018年 | 166篇 |
2017年 | 121篇 |
2016年 | 135篇 |
2015年 | 167篇 |
2014年 | 249篇 |
2013年 | 368篇 |
2012年 | 492篇 |
2011年 | 543篇 |
2010年 | 302篇 |
2009年 | 307篇 |
2008年 | 473篇 |
2007年 | 507篇 |
2006年 | 494篇 |
2005年 | 503篇 |
2004年 | 488篇 |
2003年 | 432篇 |
2002年 | 436篇 |
2001年 | 112篇 |
2000年 | 98篇 |
1999年 | 132篇 |
1998年 | 104篇 |
1997年 | 86篇 |
1996年 | 65篇 |
1995年 | 76篇 |
1994年 | 56篇 |
1993年 | 58篇 |
1992年 | 66篇 |
1991年 | 63篇 |
1990年 | 49篇 |
1989年 | 58篇 |
1988年 | 48篇 |
1987年 | 45篇 |
1986年 | 50篇 |
1985年 | 41篇 |
1984年 | 36篇 |
1983年 | 45篇 |
1982年 | 29篇 |
1981年 | 39篇 |
1980年 | 23篇 |
1979年 | 40篇 |
1978年 | 25篇 |
1975年 | 16篇 |
1974年 | 14篇 |
1973年 | 20篇 |
1971年 | 13篇 |
排序方式: 共有8285条查询结果,搜索用时 15 毫秒
1.
2.
Caroline A. Harrison BMedSci MRCS ; Martin J. Heaton MD FRCS ; Christopher M. Layton PhD ; Sheila Mac Neil PhD 《Wound repair and regeneration》2006,14(2):203-209
To produce a stable epidermis, keratinocytes need to be firmly attached to the basement membrane. However, following wounding, keratinocytes are required to develop a migratory phenotype in order to reepithelialize the wound. To investigate some of the issues underlying reepithelialization, we have developed a three-dimensional in vitro model of tissue-engineered skin, comprising sterilized human dermis seeded with human keratinocytes and dermal fibroblasts. Using this model, we have shown that the inclusion of fibroblasts within the model increases the stability of keratinocyte attachment. We have also demonstrated that keratinocyte migration occurs most effectively in the absence of a basement membrane and following the inclusion of fibroblasts in the model. In addition, subjecting the keratinocyte layer to mechanical trauma induces a migratory phenotype. We conclude that this three-dimensional in vitro wound model can be used to increase our understanding of the factors that enhance keratinocyte migration and hence wound healing in vivo. 相似文献
3.
Stephen Kellett Nigel Beail David W. Newman Pat Frankish 《Journal of Applied Research in Intellectual Disabilities》2003,16(2):127-134
Introduction People with intellectual disabilities are now acknowledged to be susceptible to the full range of mental health disorders. This acknowledgement has resulted in the need to develop and evaluate instruments for the assessment and detection of mental health problems. This research evaluates the use of the Brief Symptom Inventory (BSI) with 200 people with mild intellectual disabilities representing community, clinical and forensic populations. Results and conclusions Results illustrate the reliability of the BSI for each of the groups and demonstrates how the Positive Symptom Total (PST) index effectively discriminates between study groups. Case rates for each group are provided. The study illustrates that the BSI could be employed as a brief multitrait assessment instrument and as a treatment outcome measure with people with an intellectual disability. 相似文献
4.
Anorectal function in the solitary rectal ulcer syndrome 总被引:8,自引:6,他引:2
Nigel R. Womack F.R.C.S. Professor Norman S. Williams M.S. John H. Holmfield Mist John F. Morrison Ph.d. 《Diseases of the colon and rectum》1987,30(5):319-323
The anorectal function of nine patients with solitary rectal ulcer syndrome (SRUS) (5 F: 4 M, median age, 27 (range, 19–41
years) and nine control subjects (5 F: 4 M, median age, 47 (35–66)P<0.01) has been investigated by a new technique that radiologically visualizes the anorectum during voiding of a semisolid
contrast medium, while simultaneously measuring intrarectal pressure and anal sphincter EMG activity. A degree of rectal prolapse
was demonstrated in eight of the SRUS patients; six of these lesions were clinically occult. Abnormal failure of the anal
sphincter to relax on voiding was present in seven of the SRUS patients. These abnormalities resulted in the SRUS patients
requiring a greater increase in intrarectal pressure (median, 100 cm water) to void than the control subjects (median, 65
cm water,P<0.01). This combination of high intrarectal pressure and rectal prolapse during straining seems to be the cause of SRUS
This work was supported by a grant from the Medical Research Council. 相似文献
5.
6.
7.
AIM: The aim of this study was to determine the impact of asthma and air pollution on school attendance of primary school children 6 to 12 years of age in Qatar. STUDY DESIGN: This was a cross-sectional population-based study. SUBJECTS: The total 31,400 Qatari school children at the primary school (16,130 boys and 15,270 girls) 6 to 12 of age were studied to investigate school absenteeism caused by asthma and wheezing during the academic year October 2003 to July 2004. METHODS: We have used the School Health Registry for obtaining the student information and school absenteeism due to asthma and wheezing. Again we had double confirmation on the data obtained on asthmatic children by using the modified version of the International Study of Asthma and Allergies in Childhood [ISAAC] questionnaire. RESULTS: A total of 3,270 (10.4%) pupils were diagnosed as having asthma and wheezing. Overall 2,516 (8.02%) pupils were absent from the school for at least one day during the year. There was a statistically significant difference between asthmatic and wheezing students in number of days absent from the school (p < 0.0001). Most absenteeism occurred during spring for both boys (45%) and girls (47%), followed by autumn for boys (33%) and girls (36%). The measured pollutants reached a peak during the spring season and then in autumn of the studied academic year. CONCLUSION: Children with known asthma miss more days of school than those who do not have asthma. This study finding shows that air pollution has an impact on asthma, which results in significant school absenteeism. 相似文献
8.
9.
P. Muiesan W. Jassem R. Girlanda R. Steinberg H. Vilca-Melendez G. Mieli-Vergani A. Dhawan M. Rela N. Heaton 《American journal of transplantation》2006,6(5P1):1012-1016
We report our experience of pediatric liver transplantation with partial grafts from non-heart beating donors (NHBD). Controlled donors less than 40 years of age with a warm ischemia time (WI) of less than 30 min were considered for pediatric recipients. Death was declared 5 min after asystole. A super-rapid recovery technique with aortic and portal perfusion was utilized. Mean donor age was 29 years and WI 14.6 min (range 11–18). Seven children, mean age 4.9 years (0.7–11), median weight 20 kg (8.4–53) received NHBD segmental liver grafts. Diagnoses included seronegative hepatitis, neonatal sclerosing cholangitis, familial intrahepatic cholestasis, hepatoblastoma, primary hyperoxaluria and factor VII deficiency (n = 2).The grafts included four reduced and one split left lateral segments, one left lobe and one right auxiliary graft. Mean cold ischemia was 7.3 h (6.2–8.8). Complications included one pleural effusion and one biliary collection drained percutaneously. At 20 months (10–36) follow-up all children are alive and well with functioning grafts.
Donation after cardiac death is a significant source of liver grafts for adults and children with careful donor selection and short cold ischemic times. 相似文献
Donation after cardiac death is a significant source of liver grafts for adults and children with careful donor selection and short cold ischemic times. 相似文献
10.