全文获取类型
收费全文 | 196299篇 |
免费 | 16157篇 |
国内免费 | 9145篇 |
专业分类
耳鼻咽喉 | 2184篇 |
儿科学 | 3572篇 |
妇产科学 | 3348篇 |
基础医学 | 14633篇 |
口腔科学 | 1081篇 |
临床医学 | 23482篇 |
内科学 | 33050篇 |
皮肤病学 | 847篇 |
神经病学 | 4207篇 |
特种医学 | 9646篇 |
外国民族医学 | 66篇 |
外科学 | 26883篇 |
综合类 | 35184篇 |
现状与发展 | 28篇 |
预防医学 | 9860篇 |
眼科学 | 963篇 |
药学 | 15651篇 |
123篇 | |
中国医学 | 11371篇 |
肿瘤学 | 25422篇 |
出版年
2024年 | 542篇 |
2023年 | 2815篇 |
2022年 | 5063篇 |
2021年 | 7017篇 |
2020年 | 6776篇 |
2019年 | 5704篇 |
2018年 | 5326篇 |
2017年 | 6173篇 |
2016年 | 7195篇 |
2015年 | 6666篇 |
2014年 | 12021篇 |
2013年 | 11757篇 |
2012年 | 11718篇 |
2011年 | 12913篇 |
2010年 | 10524篇 |
2009年 | 10021篇 |
2008年 | 9998篇 |
2007年 | 10685篇 |
2006年 | 10032篇 |
2005年 | 9192篇 |
2004年 | 7499篇 |
2003年 | 6670篇 |
2002年 | 5803篇 |
2001年 | 5539篇 |
2000年 | 4511篇 |
1999年 | 3641篇 |
1998年 | 3222篇 |
1997年 | 3104篇 |
1996年 | 2327篇 |
1995年 | 2161篇 |
1994年 | 2015篇 |
1993年 | 1444篇 |
1992年 | 1384篇 |
1991年 | 1187篇 |
1990年 | 986篇 |
1989年 | 903篇 |
1988年 | 888篇 |
1987年 | 718篇 |
1986年 | 656篇 |
1985年 | 830篇 |
1984年 | 667篇 |
1983年 | 420篇 |
1982年 | 589篇 |
1981年 | 450篇 |
1980年 | 398篇 |
1979年 | 301篇 |
1978年 | 263篇 |
1977年 | 232篇 |
1976年 | 230篇 |
1975年 | 106篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
目的 评价子宫动脉栓塞术治疗子宫肌瘤的近期疗效。方法 89例子宫肌瘤患者,采用Seldinger技术分别作左右子宫动脉主干插管检查和栓塞治疗,栓塞剂采用聚乙稀醇颗粒(PVA)或白芨混合颗粒。结果 72例(80.9%)完成随访,随访时间1~28个月。有94.1%(64/68)的患者月经复常;治疗后瘤体缩小25.2%~76.8%(M=41.3%)。除了术中术后疼痛(65例)和发热(16例)外,有2例因肌瘤坏死行子宫切除术,1例出现卵巢早衰。结论 子宫动脉栓塞术治疗子宫肌瘤的近期疗效满意,远期疗效尚待进一步观察。 相似文献
12.
目的:研究^18氟—氟化脱氧葡萄糖(^18F-FDG)在下咽部肿瘤诊断中的作用。方法:20例下咽部肿瘤患者均接受^18F-FDG检查及CT、全组内镜(食管、咽喉、气管镜)检查。结果:20例下咽部肿瘤患者^18F-FDG检查结果显示:2例阴性;18例肿瘤原发部位有同位素浓集,其中5例伴异位同位素浓集。对此5例患者进一步临床、病理检查证实:1例食管部占位,2例肺部病变,2例为良性改变。^18F-FDG检查结果显示的病变范围与CT、内镜检查相符。结论:^18F-FDG检查可以提高下咽部肿瘤、尤其是隐匿的并发肿瘤诊断的准确性,明确病变范围,为临床治疗提供依据;同时又是一个简单、易行的下咽部肿瘤的随访检查手段。 相似文献
13.
14.
目的探讨初次献血对红细胞膜Na+-K+-ATP酶活性的影响.方法应用比色法分别检测50例符合献血条件的健康初次献血者献血前后的红细胞膜Na+-K+-ATP酶活性,并对结果进行分析.结果初次献血者献血前后红细胞膜Na+-K+-ATP酶活性分别为3.121±0.441和2.907±0.397 μmol.Pi/107 RBC.h,两者比较无明显差异(P>0.05).结论初次献血对红细胞膜Na+-K+-ATP酶活性无影响,献血不会造成红细胞功能损伤. 相似文献
15.
Clinical parameters that predict histology of postchemotherapy retroperitoneal lymph node mass in testicular cancer 总被引:2,自引:0,他引:2
MIZUKI ONOZAWA KOJI KAWAI TAKAHIRO YAMAMOTO SHIRO HINOTSU SADAMU TSUKAMOTO KAZUNORI HATTORI NAOTO MIYANAGA TORU SHIMAZUI HIDEYUKI AKAZA 《International journal of urology》2004,11(7):535-541
BACKGROUND: Since the advent of cisplatin-based chemotherapy, the majority of metastatic testicular cancers can be cured by chemotherapy followed by retroperitoneal lymph node dissection (RPLND). However, postchemotherapy RPLND confers no therapeutic benefit if the residual mass contains no viable cells. Therefore, to determine which parameters predict a patient's likelihood of having only necrosis in the residual mass, we retrospectively analyzed clinical parameters of patients who underwent postchemotherapy RPLND. METHODS: Data from 27 patients with metastatic testicular cancer were analyzed. The histology of the primary tumor was seminoma in 11 cases and non-seminoma in 16 cases. All of the patients with non-seminoma showed a normalization of tumor markers after chemotherapy. Analysis of clinical parameters included data for the initial histology, pretreatment tumor marker levels, postchemotherapy retroperitoneal mass size, and the histology of the dissected RPLNs. RESULTS: Histological examination of dissected RPLNs showed residual tumor in 27% of seminoma patients and 38% of non-seminoma patients. In seminoma patients, no viable cells were found in all six patients with pretreatment lactate dehydrogenase (LDH) levels below 7.5 times the upper limit of normal, or in all five of the patients with postchemotherapy RPLNs less than 2.5 cm. In non-seminoma patients, no viable cells were found in nine of 10 patients with pretreatment alpha-fetoprotein (AFP) levels less than 2700 ng/mL, or in eight of nine patients with residual mass less than 2.5 cm. CONCLUSIONS: Both postchemotherapy RPLN mass size and pretreatment tumor marker levels are possible predictors for necrosis of the residual mass in testicular cancer patients. 相似文献
16.
目的 评价控制性降压是否增加脊髓对牵拉损伤的易感性。材料与方法健康成年杂种犬6只,随机分为常压和控制性降压脊髓牵拉损伤组。观察常压及控制性降压水平下相同程度牵拉损伤后脊髓血流(SCBF)、体感诱发电位(SEP)、神经源性运动诱发电位(NMEP)改变的差异。结果 外周血有创动脉压(MABP)平均下降幅度为40.5%。经SSPS统计软件独立样本t检验,不同牵拉水平下,常压组及低压组的SCBF(%)、SEP波幅(Asep)(%)及NMEP波幅(%)无显著差异。结论 尼卡地平控制性降压不增加脊髓对牵拉损伤的易感性。 相似文献
17.
ROLF HULTCRANTZ BO ANGELIN KURT EINARSSON LEIF FRIMAN 《Journal of internal medicine》1987,221(5):503-507
ABSTRACT. Hultcrantz R, Angelin B, Einarsson K, Friman L (Departments of Internal Medicine and Roentgenology, Serafimer Hospital, and Department of Internal Medicine, Huddinge University Hospital, Karolinska Institute, Stockholm, Sweden). Spontaneous regression of Budd-Chiari syndrome (hepatic venous occlusion) in a young female. Acta Med Scand 1987; 221:503–7. A case of occlusion of the hepatic veins in an 18-year-old girl is presented. The onset was sudden with massive ascites and markedly impaired general condition. The diagnosis was based on liver biopsy and angiograms of the caval and hepatic veins as well as of the celiac artery. No predisposing factors could be found. The patient was treated conservatively with laparo-centesis and diuretics. Clear improvement was seen after two weeks, and after four weeks she had no ascites and could be discharged. All liver function tests were then normalized. After three months, all diuretics could be withdrawn, and in the following 11 years she has remained completely recovered. The case illustrates that also widespread thrombi of the hepatic veins may sometimes rapidly dissolve spontaneously, with apparent total reconstitution of hepatic function. This case is unusual since previously reported cases have had high mortality rates and, in surviving cases, operative procedures or large doses of diuretics have been required to control the ascites. 相似文献
18.
Hui-Ju Wen Ying-Chu Lin Yung-Ling Lee Yueliang Leon Guo 《Pediatric allergy and immunology》2006,17(7):489-494
High cord blood immunoglobulin E (cbIgE) is known to be associated with increased risks of atopic diseases in childhood. The relationship between genetic polymorphisms and high cbIgE has not been well documented. A cross-sectional study was conducted to assess the association between cbIgE and genetic polymorphisms of interleukin (IL)-4 -590C/T, the beta-subunit of the high-affinity receptor for IgE (FcepsilonRI-beta) E237G, lymphotoxin (LT)-alphaNcoI alleles, and tumor necrosis factor (TNF)-alpha -308G/A. A total of 320 mother-neonate pairs were recruited from four maternity hospitals from different locations of Taiwan. Cord blood was obtained and assayed for cbIgE. Polymerase chain reaction followed by restriction fragment length polymorphism was used to assess the genotypes. Three hundred pairs of mothers and neonates were included in the final analysis. Infants with IL-4 -590 C allele were found to have higher risk of elevated cbIgE (> or =0.35 IU/ml, 24.3%) (p = 0.004). After adjusting for gender, birth order, maternal age, and history of allergic disease in maternal and paternal families, odds ratios for CC and CT genotypes were 4.41 and 3.16 (95% confidence interval 0.78-22.67, and 1.66-6.13), respectively, using TT genotype as reference. The genotypes of FcepsilonRI-beta, LT-alpha, and TNF-alpha were not associated with cbIgE before or after the adjustment. Our finding suggested a significant association of cbIgE with genetic polymorphism of IL-4 -590C/T, but not with the genotypes of FcepsilonRI-beta, LT-alpha, and TNF-alpha. 相似文献
19.
Masafumi Kumano Hideaki Miyake Isao Hara Junya Furukawa Atsushi Takenaka Masato Fujisawa 《International journal of urology》2007,14(4):336-338
BACKGROUND: The objective of this study was to evaluate the efficacy and safety of first-line high-dose chemotherapy (HDCT) combined with peripheral blood stem cell transplantation (PBSCT) for patients with advanced extragonadal germ cell tumors (EGGCT). METHODS: Six male patients with advanced non-seminomatous EGGCT were treated with HDCT combined with PBSCT following 2-3 cycles of conventional-dose induction chemotherapy. The regimens used for HDCT were carboplatin, etoposide and ifosfamide (ICE) in five patients and ICE plus paclitaxel (T-ICE) in one patient, and that for induction therapy was cisplatin, etoposide and bleomycin (PEB) in all patients. As a rule, HDCT was continuously administered until alpha-fetoprotein (AFP) and beta-human chorionic gonadotropin normalized (beta-HCG). RESULTS: Following 1-6 courses of HDCT (median, 4 courses), beta-HCG and AFP were normalized in all patients, and five and one patient were diagnosed as showing partial remission and stable disease, respectively. Five patients underwent surgical resection of residual tumors after HDCT, yielding necrotic tissue in two, mature teratoma in two, and viable cancer tissue in one, and the surgical margin was negative in all patients. At a median follow-up of 36 months, five patients were alive and disease-free, whereas the remaining one died of disease progression. Although all patients had grade 3 hematological toxicity, there was no treatment-related death by combining PBSCT. CONCLUSIONS: First-line HDCT with PBSCT could be safely administered to patients with advanced EGGCT, and the antitumor effect of this treatment was comparatively favorable. First-line HDCT therefore may represent an attractive option for patients with advanced EGGCT. 相似文献
20.
Tsuneharu Miki Yoichi Mizutani Hideyuki Akaza Seiichiro Ozono Taiji Tsukamoto Toshiro Terachi Katsusuke Naito Norio Nonomura Isao Hara Osamu Yoshida The Japan Blood Cell Transplantation Study Group for Testicular Germ Cell Tumor 《International journal of urology》2007,14(1):54-59
OBJECTIVE: Standard chemotherapy shows relatively low long-term survival in patients with poor-risk testicular germ cell tumor (GCT). First-line high-dose chemotherapy (HD-CT) may improve the result. High-dose carboplatin, etoposide, ifosfamide chemotherapy followed by autologous peripheral blood stem cell transplantation (PBSCT) was investigated as first-line chemotherapy in patients with advanced testicular GCT. METHODS: Fifty-five previously untreated testicular GCT patients with Indiana 'advanced disease' criteria received three cycles of bleomycin, etoposide and cisplatin (BEP) followed by one cycle of HD-CT plus PBSCT, if elevated serum tumor markers were observed after three cycles of the BEP regimen. RESULTS: Thirty patients were treated with BEP alone, because the tumor marker(s) declined to normal range. Twenty-five patients received BEP and HD-CT. One patient died of rhabdomyolysis due to HD-CT. Three and six (13% and 25%) out of 24 patients treated with BEP and HD-CT achieved marker-negative and marker-positive partial responses, respectively. The other patients achieved no change. Fifteen (63%) are alive and 14 (58%) are free of disease at a median follow-up time of 54 months. Severe toxicity included treatment-related death (4%). CONCLUSIONS: HD-CT with peripheral stem cell support can be successfully applied in a multicenter setting. HD-CT demonstrated modest anticancer activity for Japanese patients with advanced testicular GCT and was well tolerated. This regimen might be examined for further investigation in randomized trials in first-line chemotherapy for patients with poor-risk testicular GCT. 相似文献