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   12880篇
  免费   595篇
  国内免费   13篇
耳鼻咽喉   480篇
儿科学   1183篇
妇产科学   475篇
基础医学   728篇
口腔科学   870篇
临床医学   917篇
内科学   2177篇
皮肤病学   336篇
神经病学   825篇
特种医学   603篇
外科学   3033篇
综合类   80篇
一般理论   7篇
预防医学   342篇
眼科学   422篇
药学   669篇
中国医学   42篇
肿瘤学   299篇
  2024年   13篇
  2023年   164篇
  2022年   94篇
  2021年   221篇
  2020年   181篇
  2019年   223篇
  2018年   430篇
  2017年   373篇
  2016年   442篇
  2015年   319篇
  2014年   484篇
  2013年   701篇
  2012年   773篇
  2011年   876篇
  2010年   486篇
  2009年   289篇
  2008年   795篇
  2007年   840篇
  2006年   860篇
  2005年   831篇
  2004年   849篇
  2003年   786篇
  2002年   791篇
  2001年   439篇
  2000年   503篇
  1999年   316篇
  1998年   91篇
  1997年   78篇
  1996年   81篇
  1995年   32篇
  1994年   31篇
  1993年   15篇
  1992年   10篇
  1991年   9篇
  1990年   9篇
  1989年   9篇
  1988年   3篇
  1987年   5篇
  1986年   3篇
  1984年   7篇
  1983年   2篇
  1981年   3篇
  1979年   2篇
  1978年   2篇
  1977年   2篇
  1974年   3篇
  1972年   5篇
  1968年   1篇
  1967年   1篇
  1954年   1篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
The aim of the present study was to examine subpreputial bacteriology and to compare it with the urine cultures of healthy male children. Seventy-two male children were divided into two groups as A and B according to age. In both groups preputial sac and urine cultures were taken simultaneously. Gram (+) enteric cocci were the most common isolated pathogens from the preputial sac in group B. Enterobacter, E. coli and staphylococci species were isolated from the urine cultures of three patients in group B. We could not find any difference between the preputial sac swabs of group A and B patients, but the isolation rate of urine cultures of group A patients was significantly higher than group B (p < 0.05). The findings of the present study support a potential role of the prepuce acting as a reservoir of faecal bacteria in the pathogenesis of UTI in male infants, especially in the first year of life. Improved penile hygiene after the first year of life does not alter the subpreputial bacteriology, but significantly decreases the contamination of urine. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   
92.
Purpose: The aims of the present prospective study were to apply a new simplification for Laparoscopic Burch Colposuspension and to assess the postoperative results of this treatment modality for stress urinary incontinence.Materials and methods: Twenty-four patients underwent simplified laparoscopic procedure via two ports, utilising endoscopic tacker and two stripes of prolene mesh. Patients were evaluated for operative time,duration of urethral catheter, length of hospital stay, complications and continence status.Results: The technique was successful in 21 patients after 24 months follow-up. Average operative time was 39 minutes. The lengths of urethral catheterisation and hospital stay were 22 and 45 hours, respectively. One operative complication and three postoperative recurrences were recorded.Conclusion: Laparoscopic bladder neck suspension continues to develop as the instruments and techniques are improved. In carefully evaluated patients, it provides safe and minimally invasive procedure. We report the results of a new technique to simplify and speed up a laparoscopic extraperitoneal colposuspension. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   
93.
We analysed the inter-relationships of the cause and the type of trauma, the presence of pelvic fracture, the associated intraabdominal organ injuries,and the morbidity and mortality rates in 154 patients presenting and being treated for UGT between 1983 and 1997.The cause of injury was blunt in 77% of cases and penetrating in 13%. The most frequently injured organs were kidney followed by urethra and bladder. Bowels, liver and spleen were the most frequently associated injured organs. Moreover, bladder injuries were strongly associated with bowel injuries (p < 0.0001). Hemodynamically normal 49 children with minor or major kidney injuries were managed conservatively. Hemodynamically non-stable 11 patients were explored.The majority of urogenital injuries can be managed conservatively evenwhen associated with intraabdominal organ injuries. Solid genitourinary organ injuries may accompany more frequently to intraperitoneal solidorgan injury. Whereas, non-solid genitourinary organ injuries may more frequently associated with injuries of intraperitoneal hollow viscus. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   
94.
95.
The authors present two unsuccessful clinical cases of end-to-side neurorrhaphy. In the first patient the distal median nerve was coapted in an end-to-side manner to the intact ulnar nerve. In the other patient four cables of sural nerve graft were used to bridge the ulnar nerve and the intact median nerve by two end-to-side coaptations. Neurorrhaphies were performed via epineural sutures through epineural windows. Both of the cases failed to demonstrate any signs of regeneration either clinically or as evidenced by electromyography, Semmes-Weinstein monofilament test, or 256-Hz vibration tests at 18 and 21 months' follow-up respectively.  相似文献   
96.
97.
98.
99.
A neurocutaneous island flap model: an experimental study in rats   总被引:5,自引:0,他引:5  
Neurocutaneous flaps have been popularized recently in clinical reconstructive surgery. However, controversies exist concerning their anatomy and physiology. The particular role of neural vasculature in the survival of these skin flaps is also quite undefined in the experimental setting, and additional studies on this subject are necessary. The goal of this study was to describe a neurocutaneous flap in a rat model and to investigate its blood supply. Thirty male Sprague-Dawley rats weighing 300 to 350 g were used in this study, which was conducted in two stages. During the first stage, the lower extremities of 10 rats were dissected for the anatomic study of the neurocutaneous flap. A constant cutaneous nerve innervating the anterolateral thigh skin was exposed. It arose either from the saphenous nerve or the superficial epigastric nerve and was accompanied by a constant longitudinal arterial plexus. The tiny neural vessels were conveyed by the superficial fascia along their course. A 30 x 30-mm cutaneous island flap, which was based only on the cutaneous nerve with its accompanying vessels and a strip of superficial fascia, was raised on the anterolateral thigh skin using an operating microscope. The well-perfused skin territory was marked after sodium fluorescein injection. The stained skin territory was located centrally and medially on the whole island flap, and it was approximately 10 x 20 mm. This finding was confirmed by the qualitative assessment of the vascularity for this skin territory in microangiography. After studying the pedicle anatomy and determining the optimal viable skin island, the second stage of the study was performed. The remaining 20 rats were divided into two groups. In the experimental group (N = 10), a neurocutaneous island flap (10 x 20 mm) was outlined on the anterolateral aspect of the thigh at its middle third. It was designed in such a way that its short and long axes lay in the center of the distance between the anterior superior iliac spine and the anterior aspect of the knee joint. After identification and dissection of the neurovascular pedicle, the flap was raised in a lateral-to-medial direction without including the deep fascia. At this point the flap remained connected only by the pedicle and a strip of superficial fascia surrounding it. It was sutured in the same place. In the control group (N = 10), the pedicle of the flap was severed and the skin island was sutured back as a composite graft. All the experimental flaps survived well. In the control group, none of the flaps survived except one that was partially viable. The flaps in the experimental group were reelevated as neurocutaneous island flaps on day 7 for microangiographic study, and specimens were processed for histologic staining. Microangiography revealed the extent of neural vasculature and vascularization of the skin through cutaneous perforators. Histologic investigation demonstrated the neural vessels that were related closely to the superficial fascia. The authors propose a neurocutaneous island flap model in the lower extremity of the rat in which the survival of the flap depended mainly on the neural arterial supply. It was also demonstrated that the superficial fascia played a role as a connective tissue framework for conveying tiny neural blood vessels to reach the skin. This model may serve as a reproducible and reliable neurocutaneous island flap model for additional studies in this field.  相似文献   
100.
BACKGROUND: Streptococcus pneumoniae, a common pathogen leading to pneumonia, is a cause of morbidity and mortality in immunosuppressed patients. Vaccination against this agent can be recommended for immunosuppressed patients, including those with chronic renal failure, nephrotic syndrome and renal transplant recipients; however, a diminished immune response and loss of protective antibodies have been observed. PATIENTS AND METHODS: In our prospective study, the efficacy and side effects of polyvalent pneumococcal vaccination were investigated in renal transplant recipients. A total of 21 patients (6 female, 15 male) with well-functioning renal allografts, who had transplant surgery at least 2 months before, were included in the study. The patients were stratified according to the immunosuppressive protocol and 8 received double, while 13 received triple, immunosuppressive agents. After obtaining basal serum samples, all cases were vaccinated with the 0.5 mL intramuscular administration of polyvalent polysaccharide pneumococcal vaccine (Pneumo 23 Pasteur Merieux, lot No: K 1131). RESULTS: Following a mean of 6 wk in all patients and also a mean of 12 wk in 12 patients, serum samples were again obtained to measure pneumococcal antibodies. Antibody titers following 6 and 12 wk of vaccination were significantly higher, as compared with basal values in all patients, except one. These titers did not show any statistically significant difference between double and triple therapies. There was no significant difference between the 12th and 6th wk postvaccination antibody titers. No systemic or local adverse effects were observed. CONCLUSION: Pneumococcal vaccination is safe and effective in patients with well-functioning renal allografts, at least in the short term. This vaccination policy may be useful for preventing invasive pneumococcal disease in immunosuppressed patients.  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