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   3823篇
  免费   217篇
  国内免费   26篇
耳鼻咽喉   17篇
儿科学   89篇
妇产科学   24篇
基础医学   364篇
口腔科学   45篇
临床医学   229篇
内科学   1237篇
皮肤病学   8篇
神经病学   164篇
特种医学   69篇
外科学   781篇
综合类   11篇
预防医学   89篇
眼科学   71篇
药学   125篇
中国医学   1篇
肿瘤学   742篇
  2023年   29篇
  2022年   61篇
  2021年   78篇
  2020年   35篇
  2019年   77篇
  2018年   89篇
  2017年   57篇
  2016年   69篇
  2015年   75篇
  2014年   117篇
  2013年   113篇
  2012年   181篇
  2011年   249篇
  2010年   166篇
  2009年   126篇
  2008年   160篇
  2007年   214篇
  2006年   195篇
  2005年   197篇
  2004年   156篇
  2003年   147篇
  2002年   184篇
  2001年   111篇
  2000年   143篇
  1999年   127篇
  1998年   52篇
  1997年   38篇
  1996年   35篇
  1995年   26篇
  1994年   29篇
  1993年   17篇
  1992年   80篇
  1991年   62篇
  1990年   44篇
  1989年   62篇
  1988年   47篇
  1987年   67篇
  1986年   50篇
  1985年   47篇
  1984年   28篇
  1983年   19篇
  1982年   10篇
  1980年   19篇
  1979年   29篇
  1978年   14篇
  1975年   12篇
  1974年   9篇
  1971年   17篇
  1968年   11篇
  1967年   16篇
排序方式: 共有4066条查询结果,搜索用时 265 毫秒
941.
942.
943.

Background

Patient with α-Fetoprotein (AFP)-producing gastric cancer usually has a short survival time due to frequent hepatic and lymph node metastases. Gastric cancer with portal vein tumor thrombus (PVTT) is rare and has an extremely poor prognosis.

Case presentation

A 63-year-old man was found to have a huge Type 3 gastric cancer with a PVTT and a highly elevated serum AFP level. Chemotherapy with S-1 plus cisplatin was given to this patient with unresectable gastric cancer for 4 months. The serum AFP level decreased from 6,160 ng/mL to 60.7 ng/mL with chemotherapy. Since the PVTT disappeared after the chemotherapy, the patient underwent total gastrectomy. Histological findings of the primary tumor after chemotherapy showed poorly differentiated adenocarcinoma without hepatoid cells and viable tumor cells remaining in less than 1/3 of the neoplastic area of mucosa and one lymph node. The cancerous cells were immunohistochemically stained by anti-AFP antibody. The patient has survived for 48 month without recurrence.

Conclusions

AFP-producing gastric cancer with a PVTT has an extremely poor prognosis, but long-term survival was achieved for this dismal condition by salvage surgery after chemotherapy.  相似文献   
944.
Nonalcoholic fatty liver disease (NAFLD) has become a serious public health issue not only in Western countries but also in Japan. Within the wide spectrum of NAFLD, nonalcoholic steatohepatitis (NASH) is a progressive form of disease that often develops into liver cirrhosis and increases the risk of hepatocellular carcinoma (HCC). While a definite diagnosis of NASH requires liver biopsy to confirm the presence of hepatocyte ballooning, hepatic fibrosis is the most important prognostic factor in NAFLD. With so many NAFLD patients, it is essential to have an effective screening method for NAFLD with hepatic fibrosis. As HCC with non-viral liver disease has increased markedly in Japan, effective screening and surveillance of HCC are also urgently needed. The most common death etiology in NAFLD patients is cardiovascular disease event. Gastroenterologists must, therefore, pay close attention to CVD when examining NAFLD patients. In the updated guidelines, we propose screening and follow-up methods for hepatic fibrosis, HCC, and CVD in NAFLD patients. Several drug trials are ongoing for NAFLD/NASH therapy, however, there is currently no specific drug therapy for NAFLD/NASH. In addition to vitamin E and thiazolidinedione derivatives, recent trials have focused on sodium glucose co-transporter 2 (SGLT2) inhibitors and glucagon-like peptide-1 (GLP-1) analogues, and effective therapies are expected to be developed. These practical guidelines for NAFLD/NASH were established by the Japanese Society of Gastroenterology in conjunction with the Japan Society of Hepatology. Clinical evidence reported internationally between 1983 and October 2018 was collected, and each clinical and background question was evaluated using the Grades of Recommendation Assessment, Development and Evaluation (GRADE) system. This English summary pro- vides the core essentials of these clinical practice guidelines, which include the definition and concept, screening systems for hepatic fibrosis, HCC and CVD, and current therapies for NAFLD/NASH in Japan.  相似文献   
945.
Journal of Interventional Cardiac Electrophysiology - An acute cryothermal ablation lesion contains both reversible and irreversible elements. However, differences in lesions created with...  相似文献   
946.
947.

Background

Recombinant human soluble thrombomodulin (rTM) has been used for the treatment of disseminated intravascular coagulation in Japan, and an international phase III clinical trial for rTM is currently in progress. rTM mainly exerts its anticoagulant effects through an activated protein C (APC)-dependent mechanism, but the circulating APC levels after rTM treatment have not been clarified. This prospective observational study investigated plasma APC levels after rTM treatment.

Methods

Plasma levels of soluble thrombomodulin, thrombin-antithrombin complex (TAT), protein C, and APC were measured in eight septic patients treated with rTM. APC generation in vitro was assessed in the presence or absence of rTM.

Results

rTM significantly increased thrombin-mediated APC generation in vitro. In septic patients, soluble thrombomodulin levels were significantly increased during a 30–60-min period of rTM treatment and TAT levels were decreased. However, APC activity was not increased during the treatment period.

Conclusions

Plasma APC activity is not increased in septic patients treated with rTM. It is possible that APC acts locally and does not circulate systemically.
  相似文献   
948.
Endogenous bacterial endophthalmitis, also called metastatic endophthalmitis, is a rare bacterial endophthalmitis derived from distant infectious foci via the bloodstream. This infection can potentially cause not only severe visual disturbance, but also loss of the eyeball or death, as most patients are immunocompromised. This retrospective Japanese multicenter study analyzed 32 eyes in 25 definitive cases. Twelve patients (48.0%) had diabetes mellitus. Typical ocular findings were vitreous haze (87.5%), cells in the anterior chambers (62.5%) and retinal infiltrates (50.0%). Elevated body temperature (64.0%), high serum C-reactive protein (96.0%) and leukocytosis (52.0%) were also frequently observed. Culture positivity rates for intraocular fluid were higher in the vitreous (62.5%) versus aqueous humor (28.6%). High positivity rates were also observed for blood (57.1%) and central venous catheters (100%). The most common pathogen was Staphylococcus aureus (10 cases), including methicillin-resistant S. aureus (4 cases). The next most common pathogen was Klebsiella pneumoniae (7 cases), which was highly associated with liver abscess. Compared to a previous 1991 national multicenter study, there has been a fourfold increase in the ratio of S. aureus. Antibiotic susceptibility tests revealed that all Gram-positives were susceptible to vancomycin and all Gram-negatives were susceptible to third-generation cephalosporins, imipenem/cilastatin, gentamycin and levofloxacin. Prognostic factors influencing poor visual outcome included poor initial visual acuity (p < 0.01), K. pneumoniae (p = 0.027) and gram-negative bacteria (p = 0.014) as the causative bacteria. Intravitreal antibiotic injection in combination with vancomycin and ceftazidime may be applicable for use as part of the standard treatment regimen for EBE.  相似文献   
949.
950.
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