全文获取类型
收费全文 | 24489篇 |
免费 | 1938篇 |
国内免费 | 1770篇 |
专业分类
耳鼻咽喉 | 242篇 |
儿科学 | 337篇 |
妇产科学 | 343篇 |
基础医学 | 3193篇 |
口腔科学 | 439篇 |
临床医学 | 3142篇 |
内科学 | 4120篇 |
皮肤病学 | 293篇 |
神经病学 | 1401篇 |
特种医学 | 750篇 |
外国民族医学 | 15篇 |
外科学 | 2704篇 |
综合类 | 3408篇 |
现状与发展 | 6篇 |
一般理论 | 2篇 |
预防医学 | 1542篇 |
眼科学 | 578篇 |
药学 | 2471篇 |
13篇 | |
中国医学 | 1016篇 |
肿瘤学 | 2182篇 |
出版年
2024年 | 65篇 |
2023年 | 321篇 |
2022年 | 776篇 |
2021年 | 1032篇 |
2020年 | 814篇 |
2019年 | 685篇 |
2018年 | 817篇 |
2017年 | 676篇 |
2016年 | 664篇 |
2015年 | 985篇 |
2014年 | 1292篇 |
2013年 | 1069篇 |
2012年 | 1730篇 |
2011年 | 1776篇 |
2010年 | 1049篇 |
2009年 | 878篇 |
2008年 | 1281篇 |
2007年 | 1238篇 |
2006年 | 1252篇 |
2005年 | 1345篇 |
2004年 | 802篇 |
2003年 | 802篇 |
2002年 | 710篇 |
2001年 | 589篇 |
2000年 | 707篇 |
1999年 | 720篇 |
1998年 | 453篇 |
1997年 | 454篇 |
1996年 | 348篇 |
1995年 | 341篇 |
1994年 | 262篇 |
1993年 | 193篇 |
1992年 | 310篇 |
1991年 | 254篇 |
1990年 | 243篇 |
1989年 | 239篇 |
1988年 | 196篇 |
1987年 | 173篇 |
1986年 | 146篇 |
1985年 | 153篇 |
1984年 | 58篇 |
1983年 | 59篇 |
1982年 | 23篇 |
1981年 | 34篇 |
1979年 | 22篇 |
1978年 | 12篇 |
1974年 | 20篇 |
1973年 | 14篇 |
1972年 | 16篇 |
1969年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
胃癌中性糖脂的分离及纯化 总被引:3,自引:0,他引:3
作者应用甲醇氯仿抽提胃癌总脂,经sephadex-A25离子交换层析,florisil层析的方法从28g胃癌组织中分离纯化出中性糖脂(?)1.1mg,经高效薄层色谱分析,与标准品对照证实,条带清楚,纯度可靠。为胃癌中性糖脂抗原的研究打下了基础。 相似文献
32.
遥感技术在蚊虫孳生地监测中的应用 总被引:2,自引:0,他引:2
遥感技术作为一种快速、有效的监测工具,目前在国外已越来越多地应用于蚊虫调查和防治研究中。本文就遥感技术的原理、方法、以及在蚊虫研究中的应用作一概述,并对遥感在我国蚊虫研究的应用前景予以展望。 相似文献
33.
34.
慢性乙型肝炎表面抗原携带者前S1基因的高度异质性 总被引:1,自引:0,他引:1
应用半巢式聚合酶链式反应(PCR)从一例慢性HBsAg携带者血清中扩增出HBV前S1基因,将其克隆于噬菌体M13mp19中进行序列分析。结果发现:与同源性最好的HBVadr野生林相比,所测的10个克隆均有替代和插入突变,9个克隆有缺失突变,10个克隆的核苷酸变异率为5.0%-17.0%,氨基酸的变异率为13.0-60.0%;10个克隆之间的核苷酸变异率为2.3%-24.3%,氨基酸的变异率为14. 相似文献
35.
A study on various symptoms of chronic hepatitis treated with radix astragali and its regulative effect to levels of serum hormone 下载免费PDF全文
Ke-zhou Liu Zhong-hang Tong Ming-tai Zhang Wei-zheng Gu Zhi-rong Huang Bi-he Shen Pei-ren Cai Gui-lang Zhu Wen-nan He Lan-sheng Feng Lie-ming Ding Zhi Chen Jian-hua Jin Xiu-zhi Zhang Qian-yan Yu Shui-jin Tong Ping Ye 《中国结合医学杂志》1995,1(2):118-121
Sixty-seven cases of chronic hepatitis were treated with Radix Astragali. After treatment (2-month course), the clinical improvement rate in 38 cases of the Stagnation of the Liver-Qi and Deficiency of the Spleen type was 92.1%, and in 26 cases of the Deficiency of Liver Yin and Kidney Yin type was 88.5%, more effective than in the control group (P<0.05). The regulative effect to the levels of serum hormone was observed in the patients of the Stagnation of the Liver-Qi and Deficiency of the Spleen type treated with this medicine. The results showed that the levels of serum triiodothyronine, estradiol (female) and testosterone (male) were increased after treatment (1.40±1.38 ng/dl, 129.30±1.23 pg/ml and 496.24±1.47 ng/dl). Pre-treatment levels were 1.22±1.49 ng/dl, 104.60±1.45 pg/ml and 398. 17±1.55 ng/dl respectively (P<0.05); however, the level of serum prolactin (2.75±4.46 ng/ml) was lower after treatment than before treatment (3.20±3.82 ng/ml,P<0.05). No obvious changes were observed in the levels of serum follicle stimulating hormone, luteinizing hormone, thyroid stimulating hormone, thyroxine, triiodothyronine uptake ratio and cortisol after treatment. 相似文献
36.
PharmacokineticsofintravenouslyadministeredsodiumdichloroacetateinrabbitsGuBin(顾斌);SongLing(宋岭);JiangYongpei(蒋永培);WenAidong(文... 相似文献
37.
J L Guéant L Kamel D A Moneret-Vautrin S Widmer M C Laxenaire J P Nicolas 《Annales fran?aises d'anesthèsie et de rèanimation》1986,5(6):570-573
A radio-immunoassay (RIA) was used to screen for specific IgE to myorelaxants. Alcuronium was coupled to epoxy-activated Sepharose. Sixteen patients with anaphylaxis to alcuronium (n = 2), gallamine (n = 2) or suxamethonium (n = 12) were studied. The diagnosis was established by intradermal tests (ID), passive cutaneous anaphylaxis tests and human basophil degranulation tests. The amount of non specific label retained by Sepharose-ethanolamine (with sera of patients) and Sepharose-alcuronium (with sera of 11 control subjects) was estimated. The RIA was positive 10/16 (8/14 patients having reacted to a muscle relaxant other than alcuronium). The RIA seemed to be useful in the diagnosis of anaphylaxis to muscle relaxants. Drug-reactive antibodies were specific of the quaternary ammonium radical, which was the common allergenic determinant of all molecules of muscle relaxants. This test accounted for in vitro cross-reactivity, but had no predictive value for the clinical risk of crossed-anaphylaxis. This risk was best assessed by ID; it was positive in three cases. Although it was not possible to compare ID and RIA, the interpretation of which was different, both tests should be recommended for the detection of sensitivity to muscle relaxants. 相似文献
38.
Resection was carried out in 1,025 of 1,654 patients with cancer of the esophagus or esophagogastric junction at the Peking Medical College Hospitals in China from 1953 through 1973. All cancers of the esophagus were squamous cell carcinomas except for five adenocarcinomas. A lesion localized within the esophageal wall was found in 55% and lymph node metastasis in 41.3% of the patients undergoing resection. All cancers of the esophagogastric junction were adenocarcinomas. The tumor had invaded beyond the boundaries of the stomach in 76.7% of these patients, and positive nodes were found in 61% of the patients. The rate of resectability was 81.2% for esophageal cancer and 74% for cancer of the esophagogastric junction. Surgical mortality after resection was 4.9% (50/1,025). The 5-year survival after resection was 20.9% (214/1,025). Better results were found following complete resection: 24% (210/875) for all patients, 28.2% (162/575) for patients with cancer of the esophagus, and 16% (48/300) for patients with cancer of the esophagogastric junction. Late survival at 10, 15, and 20 years after resection of esophageal cancer was 20%, 12%, and 7.4%, respectively. The favorable prognostic factors after resection of esophageal cancer were tumor of the lower third of the esophagus, the absence of lymph node involvement, and the presence of a localized lesion. The 5-year survival for patients with cancer of the lower third of the esophagus was 32.7%. It was 64.2% for patients with a localized lesion with negative nodes in this subgroup. 相似文献
39.
40.
介入手术治疗异位妊娠12例临床分析 总被引:1,自引:0,他引:1
目的:探索一种治疗输卵管妊娠的微创介入手术,解决因其腹腔出血不能接受保守治疗或保守治疗失败的难题。保持输卵管完整及通畅,满足有生育需求的患。方法:对12例输卵管妊娠妇女行对侧股动脉穿刺,将导管超选择插至子宫动脉以甲氨喋呤(MTX)进行灌注及明胶海绵栓塞术。结果:本组病例中,术后10dB超复查孕囊脱落、吸收消失,栓塞后盆腔活动性出血停止。结论:介入治疗宫外孕输卵管妊娠,能有效杀灭胚胎组织,栓塞破裂血管止血效果明显,且能保持输卵管通畅。 相似文献