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   6125篇
  免费   344篇
  国内免费   45篇
耳鼻咽喉   93篇
儿科学   151篇
妇产科学   29篇
基础医学   912篇
口腔科学   122篇
临床医学   334篇
内科学   1663篇
皮肤病学   193篇
神经病学   414篇
特种医学   156篇
外科学   991篇
综合类   11篇
一般理论   1篇
预防医学   141篇
眼科学   131篇
药学   351篇
中国医学   5篇
肿瘤学   816篇
  2023年   39篇
  2022年   21篇
  2021年   132篇
  2020年   74篇
  2019年   89篇
  2018年   130篇
  2017年   101篇
  2016年   123篇
  2015年   144篇
  2014年   206篇
  2013年   207篇
  2012年   371篇
  2011年   348篇
  2010年   257篇
  2009年   206篇
  2008年   430篇
  2007年   416篇
  2006年   432篇
  2005年   473篇
  2004年   470篇
  2003年   455篇
  2002年   454篇
  2001年   70篇
  2000年   57篇
  1999年   64篇
  1998年   87篇
  1997年   87篇
  1996年   74篇
  1995年   70篇
  1994年   41篇
  1993年   55篇
  1992年   24篇
  1991年   37篇
  1990年   33篇
  1989年   35篇
  1988年   14篇
  1987年   11篇
  1986年   13篇
  1985年   17篇
  1984年   20篇
  1983年   9篇
  1982年   13篇
  1981年   12篇
  1980年   12篇
  1978年   14篇
  1977年   9篇
  1976年   6篇
  1975年   6篇
  1974年   13篇
  1972年   5篇
排序方式: 共有6514条查询结果,搜索用时 15 毫秒
91.
We report a case of adenosquamous carcinoma of the stomach that produced granulocyte-colony stimulating factor (G-CSF). The patient, who had an admission diagnosis of advanced gastric cancer, had marked leukocytosis without evidence of infection. After leukemia and metastatic leukemoid reaction were excluded by bone marrow examination, a G-CSF-producing cancer was suspected as the cause of the abnormally elevated serum G-CSF level. The resected stomach tumor was histologically diagnosed as adenosquamous carcinoma; positive expression of G-CSF by tumor cells was shown with immunohistochemical detection, which confirmed the preoperative diagnosis. Recurrent disease in the liver and lymph nodes, accompanied by leukocytosis and re-elevation of serum G-CSF, developed just 3 months after the curative gastrectomy and adjuvant chemotherapy. All of the recurrent disease was resected, restoring normal levels of serum G-CSF. The patient survived for almost 2 years after the initial surgery with extensive chemotherapy, including weekly treatment with paclitaxel, before finally succumbing to liver failure secondary to extensive liver metastasis.  相似文献   
92.
93.
BackgroundTo compare the patient-reported outcomes and arthroscopic findings between drilling and autologous osteochondral grafting (AOG) for the treatment of articular cartilage defects combined with anterior cruciate ligament (ACL) injuries.MethodsThe subjects were 40 patients who had articular cartilage defects in the weight-bearing part of the medial and lateral femur condyle combined with ACL injuries that were treated by drilling (20 patients) or AOG (20 patients) at the same time as ACL reconstruction was performed. In the drilling group patients, lesions were penetrated with multiple 1.2-mm Kirschner wires, and in the AOG group patients, grafts were made to cartilage defects from one to three osteochondral pegs harvested from the less-weight-bearing periphery of the articular surface of the femoral condyle. The patient-reported outcomes were assessed using the International Knee Documentation Committee (IKDC) subjective knee examination score. Second-look arthroscopy was performed to evaluate the repaired cartilage macroscopically.ResultsThe median follow-up duration was 25 (range, 12–42) months. The IKDC scores were significantly improved from 64.4 to 95.4 points in the drilling group and from 52.3 to 94.3 points in the AOG group, with no difference between the two groups, although there was a difference in the repaired cartilage findings of arthroscopy.ConclusionIn this study, no differences in IKDC scores were found in patients with a concomitant ACL rupture and an osteochondral lesion treated by drilling or AOG at a minimum follow-up of 1 year, regardless of the differences at arthroscopic grading of the ICRS classification.Level of evidenceCase–control study (LEVEL III).  相似文献   
94.
95.
Familial Mediterranean Fever (FMF) is a hereditary autoinflammatory disease, which is characterized by recurrent and paroxysmal fever, peritonitis, arthritis, myalgia, and skin rashes. Although various skin lesions such as “erysipelas‐like erythema”, urticaria, nonspecific purpura, and subcutaneous nodules have been described, cutaneous vasculitis is rare. We report a Japanese case of sporadic FMF accompanied by cutaneous arteritis at the time of febrile attacks of FMF. Gene analysis revealed M694I mutation in a single allele of the MEFV gene, and oral colchicine successfully controlled both periodic fever and subcutaneous nodules of arteritis. Cutaneous necrotizing vasculitis repeatedly emerging with febrile attacks should be included among the skin manifestations of FMF.  相似文献   
96.
97.
Japanese whiting (Sillago japonica) are a relatively common species that inhabit coastal shallow waters in Japan and are the target species in an important recreational fishery. We isolated eleven candidate microsatellite loci from a small insert genomic DNA library of S. japonica. We screened for polymorphisms in the eleven loci using wild individuals (n = 48) collected from Suounada Sound, in the Seto Inland Sea, Japan. The number of alleles per locus ranged from 6 to 26 with no evidence of linkage disequilibrium. Observed heterozygosity ranged from 0.58 to 0.98 with one locus exhibiting a significant departure from Hardy–Weinberg equilibrium. A test for cross-amplification using the closely related species, Sillago parvisquamis yielded scoreable peaks and a high level of polymorphism in four loci. These polymorphic microsatellites can be used to identify population structure in S. japonica and provide potential markers for the endangered S. parvisquamis.  相似文献   
98.
This retrospective study aimed to assess the diagnostic performance of contrast-enhanced ultrasound with Sonazoid (S-CEUS) for liver metastasis. We enrolled in this study 98 patients with 148 histologically proven liver lesions, with 121 metastases and 27 non-metastases. The S-CEUS technique showed sensitivity in 95.0% (115 of 121), specificity in 44.4% (12 of 27) and accuracy in 85.8% (127 of 148) for the diagnosis of metastasis. Higher body mass index had a negative influence on the positive predictive value and accuracy, and a greater depth of the lesion had a negative influence on the accuracy. The management was changed in 8 patients (8.2%) because of S-CEUS findings. In conclusion, the addition of S-CEUS may offer a great benefit by improvement of the quality of diagnosis and management for patients with cancer who have a tentative diagnosis of liver metastasis by contrast-enhanced computed tomography.  相似文献   
99.
100.
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