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   1726篇
  免费   92篇
  国内免费   2篇
耳鼻咽喉   4篇
儿科学   100篇
妇产科学   18篇
基础医学   152篇
口腔科学   25篇
临床医学   128篇
内科学   306篇
皮肤病学   47篇
神经病学   72篇
特种医学   66篇
外国民族医学   1篇
外科学   178篇
综合类   306篇
预防医学   174篇
眼科学   43篇
药学   74篇
  1篇
中国医学   3篇
肿瘤学   122篇
  2023年   7篇
  2022年   11篇
  2021年   37篇
  2020年   24篇
  2019年   23篇
  2018年   35篇
  2017年   18篇
  2016年   32篇
  2015年   62篇
  2014年   80篇
  2013年   73篇
  2012年   84篇
  2011年   106篇
  2010年   109篇
  2009年   86篇
  2008年   97篇
  2007年   92篇
  2006年   96篇
  2005年   70篇
  2004年   96篇
  2003年   62篇
  2002年   61篇
  2001年   44篇
  2000年   44篇
  1999年   37篇
  1998年   29篇
  1997年   34篇
  1996年   31篇
  1995年   24篇
  1994年   23篇
  1993年   13篇
  1992年   16篇
  1991年   8篇
  1990年   12篇
  1989年   19篇
  1988年   11篇
  1987年   9篇
  1986年   16篇
  1985年   16篇
  1984年   10篇
  1983年   4篇
  1982年   7篇
  1981年   6篇
  1980年   4篇
  1979年   3篇
  1978年   9篇
  1977年   6篇
  1976年   4篇
  1974年   3篇
  1973年   3篇
排序方式: 共有1820条查询结果,搜索用时 328 毫秒
1.
2.

Background

Inflammation and infections have been associated with prostate cancer progression. We assessed whether elevated serum cytokines or T. vaginalis seropositivity at the time of diagnosis was associated with higher grade or lethal prostate cancer.

Patients and Methods

Men with localized or metastatic prostate cancer were included in this study. Cytokine serum levels including interleukin (IL)-1α, IL-1β, IL-2, IL-6, IL-8, monocyte chemotactic protein 1 (CCL-2), tumor necrosis factor α, and growth-regulated oncogene α (CXCL-1) using a multiplex enzyme-linked immunosorbent assay and T. vaginalis serology were measured in blood samples at diagnosis.

Results

A total of 324 patients were identified at time of localized disease and 118 at time of metastatic disease. Of the 189 patients with localized disease and clinical follow-up data (median, 73 months), 28 developed lethal disease. There was no association between circulating cytokine levels above median concentrations nor T. vaginalis seropositivity and risk of intermediate- to high-risk or lethal prostate cancer.

Conclusion

Higher levels of serum cytokine levels and T. vaginalis seropositivity at diagnosis are not associated with high-grade or lethal prostate cancer and do not aid risk stratification of localized prostate cancer.  相似文献   
3.
BACKGROUND: The present study was aimed to define the gender ratio, familial occurrence, age of onset, precipitating factors, clinical types, nail and joint involvement of psoriasis in childhood and adolescence in Turkey. METHODS: A total of 61 children with psoriasis under 18 years old were evaluated retrospectively, for age, gender, age of disease onset, family history, concomitant disease, the clinical type of psoriasis, clinical localization, nail and joint involvement and treatment modalities. RESULTS: Of the patients, 23 (37.70%) were boys and 38 (62.30%) were girls. Mean age was 9.28 +/- 4.02 years in girls and 11.18 +/- 3.85 years in boys (9.96 +/- 4.03 years in all children). Mean age at the onset of the disease was 6.81 +/- 4.11 years in girls and 7.03 +/- 4.28 years in boys (6.89 +/- 4.14 years in all patients). In 14 (23%) cases, a positive family history was detected. The most frequent probable triggering factors were upper respiratory tract infections (14.8%) and positive throat culture for A group ss-hemolytic streptococcus (21.3%). Frequency of emotional stress and psychiatric morbidity were 54% and 9.8%, respectively. The most frequent localizations at onset were trunk (44.3%), extremities (54.0%), and scalp (36.0%). Three children (4.9%) had a history of dissemination from psoriatic diaper rash. In total, 51 (83.6%) patients presented with psoriasis vulgaris, eight (13.1%) with generalized pustular psoriasis, and the remaining two (3.3%) with erythrodermic psoriasis. CONCLUSION: The incidence of psoriasis among dermatological patients in childhood and adolescence was 3.8%. The disease tends to appear earlier in girls than boys. The authors suggested that stress and upper respiratory infections are the most important triggering factors in childhood and adolescence psoriasis.  相似文献   
4.
5.
6.
7.
Angiosarcoma is a rare, highly malignant tumor arising from endothelial cells of small blood vessels. They usually occur in the skin, deep soft tissues, breast and liver. Pleural angiosarcomas are extremely rare and are restricted to case reports in medical literature. It is very difficult to distinguish them from malignant mesotheliomas on clinical, radiological and even histopathological features. Immunohistochemistry is valuable in making the diagnosis, showing negative reactivity for mesothelial markers and positivity for vascular markers. Prognosis is generally dismal except in occasional cases where the disease is localized and amenable for surgical resection. We report a 55-year-old man who presented to us with chest pain, cough and hemoptysis and was diagnosed to have a pleural angiosarcoma.  相似文献   
8.
9.
10.
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