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   1224篇
  免费   49篇
  国内免费   2篇
耳鼻咽喉   29篇
儿科学   130篇
妇产科学   48篇
基础医学   114篇
口腔科学   71篇
临床医学   95篇
内科学   217篇
皮肤病学   123篇
神经病学   81篇
特种医学   47篇
外科学   145篇
综合类   9篇
预防医学   29篇
眼科学   22篇
药学   54篇
中国医学   2篇
肿瘤学   59篇
  2024年   2篇
  2023年   10篇
  2022年   12篇
  2021年   34篇
  2020年   24篇
  2019年   30篇
  2018年   40篇
  2017年   30篇
  2016年   39篇
  2015年   36篇
  2014年   49篇
  2013年   82篇
  2012年   90篇
  2011年   77篇
  2010年   51篇
  2009年   48篇
  2008年   87篇
  2007年   106篇
  2006年   102篇
  2005年   72篇
  2004年   82篇
  2003年   67篇
  2002年   53篇
  2001年   8篇
  2000年   7篇
  1999年   10篇
  1998年   9篇
  1997年   1篇
  1996年   1篇
  1994年   2篇
  1993年   3篇
  1992年   4篇
  1991年   2篇
  1990年   1篇
  1988年   1篇
  1984年   1篇
  1981年   1篇
  1974年   1篇
排序方式: 共有1275条查询结果,搜索用时 15 毫秒
81.
Activated recombinant factor VIIa was administered to a preterm infant with bleeding diasthesis and a huge subdural hematoma that could not be controlled by the blood products. The coagulation tests were normalized the following day. Recombinant factor VIIa can be a choice in selected cases with intractable bleedings unesponsive to conventional replacement therapy.  相似文献   
82.

Background

Vitiligo and acne vulgaris, commonly affecting the face, have significant psychological effects and impair the quality of life of the affected individuals. Because of their negative effect on physical appearance, these conditions may act as a potential barrier to social relationships and cause social anxiety.

Objective

The objective of the study was to investigate the social anxiety, quality of life, anxiety, and depression levels of acne and vitiligo patients with facial involvement and compare these levels with healthy controls.

Methods

Thirty-seven vitiligo and 37 acne patients, aged older than 18 years, with facial involvement and 74 age- and sex-matched healthy control subjects were included in the study. The patients and healthy controls were asked to complete the Liebowitz Social Anxiety Scale, the Hospital Anxiety and Depression Scale, and the Dermatology Life Quality Index. Disease severity was evaluated both objectively by the physician and subjectively by the patients using a visual analog scale.

Results

Social anxiety, depression, and anxiety levels of vitiligo and acne patients were significantly higher than healthy controls (p < 0.05). Quality of life was impaired in both patient groups (Dermatology Life Quality Index scores for vitiligo: 5.6 ± 5.1; acne: 6.4 ± 6.2). There was no correlation between psychiatric scale scores and disease severity. Quality of life was negatively correlated with social anxiety and depression levels in both patient groups in our study.

Conclusion

Vitiligo and acne patients had higher levels of social anxiety, anxiety, and depression compared with healthy control subjects. Considering that increased psychosocial morbidity was regardless of age, sex, and disease severity and was correlated with quality of life impairment, evaluation of the psychosocial morbidity, in particular social anxiety, may be valuable in all vitiligo and acne patients.
  相似文献   
83.
Extramedullary hematopoiesis being an important feature of agnogenic myeloid metaplasia (AMM), a chronic myeloproliferative disease of clonal origin, may affect the kidneys, but this condition is usually asymptomatic. Until now, there is only one reported case of nephrotic syndrome associated with AMM. We present a patient with AMM who had nephrotic syndrome and whose renal biopsy revealed membranous glomerulonephritis together with renal extramedullary hematopoiesis.  相似文献   
84.
85.
Goldenhar's Syndrome (oculo-auriculo-vertebral dysplasia) is a wide spectrum of congenital anomalies that involves structures arising from the first and second branchial arches. In this report, a case of a male infant, with the features of hemi facial microsomia, anotia, vertebral anomalies, congenital facial nerve palsy and lagophthalmos is described. Although the syndrome itself is not uncommon, the presence of congenital facial nerve palsy, which has been reported in rare cases, prompted this case report.  相似文献   
86.
87.
The aim of the present work was to evaluate structural and metabolic changes in histaminergic neurons in hypothalamic nucleus E2 in rats in conditions of complete external drainage of bile. Studies were performed on male Wistar rats (n = 45). Controls consisted of animals subjected to sham surgery with preservation of physiological bile flow throughout the experiment. Quantitative histological and histochemical methods were used. Serial frontal cryostat sections cut from the posterior hypothalamus were used for detection of the activity of the following enzymes: monoamine oxidase B, succinate dehydrogenase, NADH dehydrogenase, NADPH dehydrogenase, glucose-6-phosphate dehydrogenase, lactate dehydrogenase, and acid phosphatase. Morphological studies of histaminergic neurons were performed on preparations stained with thionine. These studies showed that complete external drainage of bile led to transient size reductions and rounding of cell perikarya. Metabolic changes were seen within a day of bile loss and subsequently progressed. All energy metabolic pathways were suppressed and acid phosphatase activity was increased on day 5. __________ Translated from Morfologiya, Vol. 132, No. 6, pp. 22–25, November–December, 2007.  相似文献   
88.

Objective

To investigate the presence of Chlamydophila pneumoniae and other bacterial pathogens in middle ear effusion samples obtained from children with otitis media with effusion (OME).

Materials and methods

Twenty-eight children (mean age 7.03; standard deviation 2.18) with OME unresponsive to medical therapy were included in the study. All of the children underwent ventilation tube insertion under general anesthesia. Eighteen patients were bilaterally affected whereas 10 children had unilateral disease. The middle ear fluids (46 samples in total) were collected during ventilation tube insertion, and were evaluated subsequently for the presence of C. pneumoniae and other bacterial pathogens using polymerase chain reaction (PCR).

Results

Although all samples were negative for C. pneumoniae, bacterial DNA was detected in 21 of 46 samples. Overall 40% of the patients (4/10) with unilateral involvement, and 61% of the patients (11/18) with bilateral involvement were positive for bacterial DNA. In 6 patients with bilateral OME bilateral samples were positive, whereas 5 patients with bilateral OME showed only unilateral positivity. According to the results of DNA sequencing analysis, all of the positive samples harbored only one bacterial species. In 12 of 46 samples Alloiococcus otitidis DNA (26%), in 7 Haemophilus influenzae DNA (15%), in one Streptoccoccus pneumoniae DNA (2%) and in one Moraxella catarrhalis DNA (2%) were present.

Conclusions

Our findings support that C. pneumoniae does not seem to have a role in OME in children whereas A. otitidis was found to be more frequent than the other common pathogens. Further studies are required to elucidate the exact pathogenetic role of these microorganisms in OME.  相似文献   
89.
Metastasis is a leading cause of mortality and morbidity in cancer. This process needs angiogenesis. The biology underlying cancer, metastasis, and angiogenesis has been investigated so as to determine the therapeutic targets. Invasive and metastatic cancer cells have undergone numerous genetic and epigenetic changes, manifested by cytoskeletal changes, loss of adhesion, and expression of proteolytic enzymes that degrade the basement membrane. Additionally, in endothelial cells, some epigenetic modifications occur during the formation of angiogenesis. Researchers have used some methylation inhibitors, histone deacetylase inhibitors, or methylating agents (such as S-adenosylmethionine, SAM) against cancer and angiogenesis. Although they are effective to beat these diseases, each one results in differentiation or changes in genome structure. We review epigenetically modified genes related with angiogenesis and metastasis in cancer and endothelial cells, and suggest a new proposal. This hypothesis has discussed the importance of the usage of DNA methylation inhibitors together with SAM to prevent tumor progression and genome instability or changes resulting in additional diseases.  相似文献   
90.
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