全文获取类型
收费全文 | 1621篇 |
免费 | 83篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 47篇 |
妇产科学 | 5篇 |
基础医学 | 153篇 |
口腔科学 | 31篇 |
临床医学 | 100篇 |
内科学 | 471篇 |
皮肤病学 | 124篇 |
神经病学 | 94篇 |
特种医学 | 46篇 |
外科学 | 301篇 |
综合类 | 8篇 |
预防医学 | 61篇 |
眼科学 | 27篇 |
药学 | 79篇 |
中国医学 | 2篇 |
肿瘤学 | 152篇 |
出版年
2023年 | 24篇 |
2022年 | 58篇 |
2021年 | 67篇 |
2020年 | 37篇 |
2019年 | 40篇 |
2018年 | 50篇 |
2017年 | 38篇 |
2016年 | 41篇 |
2015年 | 43篇 |
2014年 | 65篇 |
2013年 | 76篇 |
2012年 | 124篇 |
2011年 | 120篇 |
2010年 | 67篇 |
2009年 | 52篇 |
2008年 | 101篇 |
2007年 | 88篇 |
2006年 | 108篇 |
2005年 | 71篇 |
2004年 | 79篇 |
2003年 | 60篇 |
2002年 | 84篇 |
2001年 | 17篇 |
2000年 | 10篇 |
1999年 | 15篇 |
1998年 | 15篇 |
1997年 | 13篇 |
1996年 | 23篇 |
1995年 | 10篇 |
1994年 | 14篇 |
1993年 | 13篇 |
1992年 | 11篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1977年 | 3篇 |
1974年 | 3篇 |
1972年 | 3篇 |
1971年 | 2篇 |
1968年 | 2篇 |
1967年 | 2篇 |
1966年 | 5篇 |
排序方式: 共有1721条查询结果,搜索用时 31 毫秒
81.
K. Omura Takuro Misaki Takuo Hashimoto Eiji Kanehira Toru Watanabe Fumio Ishida Yoh Watanabe Tetsuhiko Shirasaka 《Cancer chemotherapy and pharmacology》1994,35(3):183-187
Both leucovorin (LV) and cisplatin ( cis-dichlorodiammine platinum II, CDDP) act as modulators of 5-fluorouracil (5-FUra) by increasing the intracellular concentration of reduced folate. We measured intracellular folate levels following the administration of LV or cisplatin in tumor-bearing rats to determine the optimal schedules for their use as 5-FUra modulators. Donryu rats were inoculated with Yoshida sarcoma cells on the right flank. Seven days after tumor inoculation, the animals were injected with LV or CDDP. The kinetic and dose-related changes in intracellular folate concentration were analyzed by means of a binding assay. Folate levels in the tumor tissues were significantly higher than baseline 1 and 2 h after administration of LV and remained significantly high until 8 h after administration. Folate levels in the tumor tissues were significantly higher than baseline 1 and 2 h after cisplatin administration, then decreased to a rather low level 8 h after, and to a significantly lower level than baseline 24 h after administration. The folate levels in the tumor tissue increased in proportion to the dose of LV, but did not increase when the dose of cisplatin was increased from 1 mg/kg to 8 mg/kg. Repeat high-dose administration of LV and repeat low-dose administration of cisplatin are advocated when they are used as modulators of 5-FUra. 相似文献
82.
Tsukube T Kawanishi Y Murakami H Hino Y Matsukawa R Ozaki N Okada K Matsuda H Wakita N Nishiwaki M Okita Y 《Artificial organs》2002,26(12):1055-1059
To investigate whether the use of a stentless porcine aortic xenograft can be an alternative for right ventricular outflow tract (RVOT) reconstruction during the Ross procedure, 9 patients underwent the Ross procedure and RVOT reconstruction with a stentless xenograft since January 2000. After the aortic valve was replaced with a pulmonary autograft, a stentless xenograft with a xeno- pericardial roll was implanted in the RVOT. One patient required subsequent aortic valve replacement because of severe regurgitation of the pulmonary autograft. All patients recovered well from the operation. The right ventricle-pulmonary arterial pressure gradient was 18 +/- 7 mm Hg at discharge and was not significantly increased during the 2-year follow-up period. Although 1 patient died of ventricular arrhythmia 5 months after, his cardiac function was normal, and transpulmonary valve pressure was 19 mm Hg in the follow-up. The other 7 patients are currently in New York Heart Association functional Class I. Although long-term follow-up is required to explain the durability, the stentless xenograft with a pericardial roll is considered to be an alternative for reconstruction of the RVOT within 2 years after the Ross procedure. 相似文献
83.
OBJECTIVES: To identify factors associated with mortality in cases with Alzheimer's disease (AD) and vascular dementia (VD), we conducted a seven-year follow-up study. METHODS: Subjects were recruited through three agents in Yamanashi prefecture. A total of 145 patients (56 men, 89 women, age at baseline 77 +/- 7.9, 80 +/- 8.5 years respectively) with AD and VD participated in the follow-up study. We analyzed the relationship between demographic or clinical variables and their survival using a Cox regression model. RESULTS: The analysis revealed that increased age, male gender, the degree of global function and past history of a fall/fracture were associated with a decreased survival rate. The rate was worse for patients with VD than for those with AD. After adjusting for age and gender, the mortality risk ratio was 1.7 (95% confidence interval 1.1-2.6) for the presence of a fall/fracture. The same analysis confined to 64 subjects for whom ApoE genotyping data were available replicated the results; a fall/fracture was a predictor of a worse survival rate. In addition, those with ApoE4 tended to have better survival rate than those without (P < 0.1). CONCLUSION: Those who are engaged in care for AD patients should appreciate the importance of a fall/fracture as a predictor of survival. 相似文献
84.
Shimbo T Nagata-Kobayashi S Morimoto T Fukui T 《Journal of clinical epidemiology》2002,55(5):531; author reply 532
85.
Nagamori M Kawaguchi S Murakami M Wada T Inobe M Ishii S Uede T 《Anticancer research》2002,22(4):2009-2013
BACKGROUND: B7 family members play a central costimulatory role in T cell activation. We have previously identified B7-1a, an alternatively spliced form of B7-1. The function of B7-1a in induction of anti-tumor immunity remains uncertain. MATERIALS AND METHODS: The cDNAs of murine B7-1, B7-1a and B7-2 were introduced into a murine osteosarcoma cell line, LM8. The ability of B7 transfectants to elicit in vivo anti-tumor immunity was comparatively analyzed with respect to tumorigenecity, pulmonary metastasis and survival time. RESULTS: LM8 cells expressing B7-1, B7-1a, or B7-2 all elicited immunological responses in immunocompetent C3H/He mice. Notably, the anti-tumor effects were most obvious in mice inoculated with B7-1a-transfected LM8 cells. Such a difference among B7-transfectants became indistinguishable in immunodeficient nude mice. CONCLUSION: These findings indicate that B7-1a serves as a more efficacious costimulatory molecule than B7-1 or B7-2 in the induction and maintenance of anti-tumor immune responses against a poorly immunogenic osteosarcoma cell line. 相似文献
86.
87.
Katsuki S Kitaoka K Takizawa K Machida T Oku T Sumiyoshi T Nagamachi Y Inomata H Nojiri S Nishino M Fujita M Niitsu Y 《Gan to kagaku ryoho. Cancer & chemotherapy》2002,29(10):1787-1790
A 38-year-old woman presented to our hospital with the chief complaint of dyspnea. A chest radiograph showed pleural effusion of the right lung and a CT scan revealed liver metastasis. A tumor biopsy done under bronchoscopy revealed large-cell carcinoma of the lungs. She was given 4 courses of a combination therapy consisting of CDDP (80 mg/m2) and vinorelbine (25 mg/m2). The primary tumor in the right lung and liver metastasis were markedly reduced in size and a partial response was obtained. The combination therapy of CDDP and vinorelbine may become a standard chemotherapy for advanced non-small cell lung cancer. 相似文献
88.
A case of pseudoxanthoma elasticum (PXE)-like calcification in adult dermatomyositis (DM) is described. The patient was a 38-year-old woman with a history of dermatomyositis for 3 months. Yellowish, hard, papulo-plaque lesions, which looked like those of pseudoxanthoma elasticum, were noted on her left axilla. Calcium deposition was confirmed by X-ray, histopathological, and electron microscopic examinations. Histopathological and histochemical examinations showed acicular calcium deposition in the middle and deep dermis surrounded by mucin. Electron microscopic examination revealed that the calcium deposition was not on collagen fibers. These morphological features were distinct from those of PXE. We proposed the possibility that degenerated mucin or degenerated elastic fiber might result in subsequent calcium deposition in reticular calcinosis in adult DM. The calcification clinically disappeared without any specific treatment except for prednisolone and cyclophosphamide. 相似文献
89.
Katakura K Irisaw A Obara K Saito A Shishido H Shibukawa G Takagi T Suzuki T Watanabe K Saito H Ishikawa H Tsuchiya T Saito T Abe T Kasukawa R Goto M Sato Y 《Fukushima journal of medical science》2002,48(1):51-56
We report a case of rectal varices that developed after endoscopic injection sclerotherapy (EIS) and Hassab's operation for esophageal varices with extrahepatic portal obstruction. A 54-year-old woman was admitted to our hospital in September 1997 for treatment of hematochezia. Emergent colonoscopy revealed tortuous rectal varices with a white plug. Angiography revealed that rectal varices were provided with backward blood flow by the inferior mesenteric vein due to extrahepatic portal obstruction. In this case, previous treatment, EIS and Hassab's operation, for esophago-gastric varices might have inhibited the development of collaterals apart from surface of gastrointestinal tract, such as para-esophageal collateral veins or spleno-renal shunt. Since the thrombus in the extrahepatic portal vein causes strong pressure on inferior mesenteric vein which is connected to the inferior vena cava via the inferior rectal vein, rectal varices might be developed. In this case, it was considered that rectal varices were not treated enough by endoscopic therapy because of regurgitant hyper blood flow against portal venous pressure. Therefore, rectal transection was performed. After the treatment, the patient suffered no further episodes of bleeding from rectal varices. 相似文献
90.
Yamaguchi T Yokokawa M Suzuki M Higashide S Katoh Y Sugiyama S Misaki T 《Surgery today》2000,30(12):1093-1099
This study was conducted to investigate whether systemic immunosuppression attenuated aortic dilatation in a rat aneurysm
model. Sprague-Dawley rats were subjected to elastase infusion of the infrarenal aorta and divided into two groups of 12 rats
each. The immunosuppression group (group 1) was given subcutaneous injections of cyclosporine A (5 mg/kg per day), azathioprine
(2 mg/kg per day), and methylprednisolone (2 mg/kg per day) from the operative day until postoperative day (POD) 6. An additional
subcutaneus injection of cyclophosphamide 30 mg/kg was also given on the operative day. The control group (group 2) was given
subcutaneous injections of saline. Relaparotomy was performed on POD 7. After measurement of the aortic diameter, aortography
and ultrasonography were performed in three rats from each group, following which the aortas were excised for histologic examination.
The aortic diameter was significantly smaller in group 1 (2.58 ± 0.37 mm) than in group 2 (6.21 ± 1.74 mm) (P < 0.01) and the aortic lumen was slightly dilated in group 1, whereas it was spherically dilated in group 2. Total loss of
elastic tissue was seen in both groups. Inflammatory cell infiltration and collagen fiber fragmentation were noted in group
2, whereas very little inflammatory cell infiltration and well-preserved collagen fibers were seen in group 1. These findings
showed that immunosuppression attenuates aortic dilatation, partly by preserving the collagen fibers, in this rat aneurysm
model.
Received: September 13, 1999 / Accepted: July 25, 2000 相似文献