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   1173篇
  免费   61篇
  国内免费   20篇
耳鼻咽喉   6篇
儿科学   25篇
妇产科学   12篇
基础医学   162篇
口腔科学   47篇
临床医学   88篇
内科学   195篇
皮肤病学   30篇
神经病学   168篇
特种医学   15篇
外科学   83篇
综合类   3篇
预防医学   152篇
眼科学   23篇
药学   102篇
中国医学   8篇
肿瘤学   135篇
  2024年   2篇
  2023年   4篇
  2022年   9篇
  2021年   17篇
  2020年   19篇
  2019年   26篇
  2018年   37篇
  2017年   31篇
  2016年   33篇
  2015年   32篇
  2014年   58篇
  2013年   43篇
  2012年   102篇
  2011年   116篇
  2010年   55篇
  2009年   51篇
  2008年   80篇
  2007年   91篇
  2006年   81篇
  2005年   95篇
  2004年   68篇
  2003年   60篇
  2002年   55篇
  2001年   5篇
  2000年   4篇
  1999年   7篇
  1998年   21篇
  1997年   5篇
  1996年   3篇
  1995年   7篇
  1994年   2篇
  1993年   4篇
  1992年   1篇
  1991年   1篇
  1990年   1篇
  1986年   3篇
  1984年   5篇
  1983年   2篇
  1982年   2篇
  1981年   2篇
  1980年   2篇
  1978年   1篇
  1977年   1篇
  1976年   1篇
  1975年   1篇
  1974年   3篇
  1969年   1篇
  1965年   1篇
  1958年   2篇
  1940年   1篇
排序方式: 共有1254条查询结果,搜索用时 20 毫秒
61.
We describe the results of an operative method applied in patients suffering from refractory ascites. Instead of the well-known shunt-implants we started to re-use Ruotte's method, which was published 100 years ago. According to our observations the anastomosis formed by the long saphenous vein and the peritoneal surface eliminates not only the known complications of the traditional shunt-operations but also provides an effective early and a late ascites inflow. The flow of the ascites was convincingly proven by regularly performed colour Doppler UH tests. This old/new method is applicable in patients with therapy-resistant ascites to eliminate the traditional shunt-models.  相似文献   
62.
More than thousand plastic operations were performed in our departments with ROMICRO-set during the last ten years. First we applied it for reconstructive and aesthetic augmentation of the breast. Thereafter, we developed new technique for gynecomastia and reconstruction of diastasis of the m. rectus abdominis sheath. According to our experience, the ROMICRO-set is a useful tool in plastic surgery. The ROMICRO-set can be used through a small incision to achieve three dimensional views with excellent exposure and lighting.  相似文献   
63.
STUDY OBJECTIVES: To investigate whether nitric oxide (NO) metabolites would be reduced in children affected by primary ciliary dyskinesia (PCD). DESIGN: Single-center observational study. PATIENTS: Fifteen children with PCD (seven boys; mean [+/- SEM] age, 10.3 +/- 0.7 years; mean FEV(1), 73 +/- 2.1% predicted) were recruited along with 14 healthy age-matched subjects (seven boys; mean age, 11.5 +/- 0.4 years; mean FEV(1), 103 +/- 5% predicted). INTERVENTIONS: We assessed the levels of nitrite (NO(2)(-)), NO(2)(-)/NO(3)(-) (NO(2)(-)/NO(3)(-)), and S-nitrosothiol in exhaled breath condensate, exhaled NO, and nasal NO from children with PCD compared to those in healthy children. MEASUREMENTS AND RESULTS: The mean exhaled and nasal NO levels were markedly decreased in children with PCD compared to those without PCD (3.2 +/- 0.2 vs 8.5 +/- 0.9 parts per billion [ppb], respectively [p < 0.0001]; 59.6 +/- 12.2 vs 505.5 +/- 66.8 ppb, respectively [p < 0.001]). Despite the lower levels of exhaled NO in children with PCD, no differences were found in the mean levels of NO(2)(-) (2.9 +/- 0.4 vs 3.5 +/- 0.3 microM, respectively), NO(2)(-)/NO(3)(-) (35.2 +/- 5.0 vs 34.3 +/- 4.5 microM, respectively), or S-nitrosothiol (1.0 +/- 0.2 vs 0.6 +/- 0.1 microM, respectively) between children with PCD and healthy subjects. CONCLUSION: These findings suggest that NO synthase activity may not be decreased as much as might be expected on the basis of low exhaled and nasal NO levels.  相似文献   
64.
m-CPP-induced self-grooming is mediated by 5-HT2C receptors   总被引:1,自引:0,他引:1  
m-Chlorophenylpiperazine (m-CPP), a potent 5-HT receptor agonist, is known to induce self-grooming in rats and exacerbate symptoms in patients with obsessive-compulsive disorder (OCD). To characterise the possible role, 5-HT(2B) and 5-HT(2C) receptors play in m-CPP-induced self-grooming, subtype-selective receptor antagonists were used. m-CPP significantly increased the amount of self-grooming in male Sprague-Dawley rats. This effect followed a bell-shaped dose-response curve with a peak at 0.6 mg/kg, i.p. Pretreatment with SB-242084, a subtype-selective 5-HT(2C) receptor antagonist (0.1-0.5 mg/kg, i.p.), reversed m-CPP-induced self-grooming. In contrast, pretreatment with the subtype-selective 5-HT(2B) receptor antagonist SB-215505 (1 mg/kg, i.p) did not block the effect of m-CPP. Two days after depletion of brain 5-HT by p-chlorophenylalanine (p-CPA, 2 x 50, 2 x 100 mg/kg, i.p.) m-CPP-induced responses were significantly enhanced compared to controls. Our studies provide evidence that direct activation of 5-HT(2C) receptors mediate m-CPP-induced self-grooming and the depletion of brain 5-HT sensitizes these receptors.  相似文献   
65.

Inherited antithrombin (AT) deficiency is a rare autosomal dominant disorder, caused by mutations in the AT gene (SERPINC1). Considering that the genotype phenotype relationship in AT deficiency patients remains unclear, especially in pediatric patients, the aim of our study was to evaluate genotype phenotype correlation in a Serbian pediatric population. A retrospective cohort study included 19 children younger than 18 years, from 15 Serbian families, with newly diagnosed AT deficiency. In 21% of the recruited families, mutations affecting exon 4, 5, and 6 of the SERPINC1 gene that causes type I AT deficiency were detected. In the remaining families, the mutation in exon 2 causing type II HBS (AT Budapest 3) was found. Thrombosis events were observed in 1 (33%) of those with type I, 11 (85%) of those with AT Budapest 3 in the homozygous respectively, and 1(33%) in the heterozygous form. Recurrent thrombosis was observed only in AT Budapest 3 in the homozygous form, in 27% during initial treatment of the first thrombotic event. Abdominal venous thrombosis and arterial ischemic stroke, observed in almost half of the children from the group with AT Budapest 3 in the homozygous form, were unprovoked in all cases.

Conclusion: Type II HBS (AT Budapest 3) in the homozygous form is a strong risk factor for arterial and venous thrombosis in pediatric patients.

What is Known:

Inherited AT deficiency is a rare autosomal dominant disorder, caused by mutations in the SERPINC1gene.

The genotype phenotype correlation in AT deficiency patients remains unclear, especially in pediatric patients.

What is New:

The genetic results for our paediatric population predominantly showed the presence of a single specific mutation in exon 2, that causes type II HBS deficiency (AT Budapest 3).

In this group thrombosis mostly occurred as unprovoked, in almost half of them as abdominal thrombosis or stroke with high incidence of recurrent thrombosis, in 27% during initial treatment.

  相似文献   
66.
67.
Syndecan 4 (SDC4), a heparan sulfate proteoglycan, and neuropilin 1 (NRP1), a transmembrane receptor, are both involved in normal wound healing, but little is known about their possible role in venous leg ulcer pathogenesis. We aimed to investigate whether there are any expression abnormalities and/or gene polymorphisms of SDC4 and NRP1 associated with venous leg ulcer. SDC4 showed significantly lower mRNA and protein expression in the uninvolved dermis of venous leg ulcer patients ( n =15) compared with controls ( n =15; p =0.0136), while NRP1 showed no expression abnormalities. None of the examined SDC4 and NRP1 polymorphisms showed a difference in their allelic distribution between leg ulcer patients ( n =92) and controls ( n =92). We hypothesize that SDC4 may play an essential role not only in the inflammation and tissue formation phases of normal wound healing, but its expression abnormalities observed in the uninvolved dermis of venous leg ulcer patients may contribute to venous leg ulcer development.  相似文献   
68.
69.
Solid papillary carcinoma (SPC) is a rare neoplasm of the breast showing a distinct morphology, neuroendocrine differentiation and should be divided into invasive and in situ subtype according to the current 2012 WHO classification of breast tumors. Here, we describe a case of a pure SPC, invasive‐type, in a 31‐years old female with an associated mammary Paget's disease (MPD) of the nipple showing a rare, CK7‐negative immune phenotype, which has not been reported so far. This unusual differential diagnosis should be added to the rare condition of CK7‐negative Paget's disease of the breast and complement a new feature to the characterization of SPC.  相似文献   
70.
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