全文获取类型
收费全文 | 29710篇 |
免费 | 2651篇 |
国内免费 | 1726篇 |
专业分类
耳鼻咽喉 | 304篇 |
儿科学 | 309篇 |
妇产科学 | 457篇 |
基础医学 | 3602篇 |
口腔科学 | 475篇 |
临床医学 | 3889篇 |
内科学 | 4723篇 |
皮肤病学 | 227篇 |
神经病学 | 1863篇 |
特种医学 | 1136篇 |
外国民族医学 | 25篇 |
外科学 | 3135篇 |
综合类 | 4227篇 |
现状与发展 | 7篇 |
一般理论 | 16篇 |
预防医学 | 2017篇 |
眼科学 | 705篇 |
药学 | 2991篇 |
14篇 | |
中国医学 | 1393篇 |
肿瘤学 | 2572篇 |
出版年
2024年 | 88篇 |
2023年 | 404篇 |
2022年 | 1036篇 |
2021年 | 1373篇 |
2020年 | 1002篇 |
2019年 | 909篇 |
2018年 | 1016篇 |
2017年 | 879篇 |
2016年 | 908篇 |
2015年 | 1345篇 |
2014年 | 1556篇 |
2013年 | 1428篇 |
2012年 | 2252篇 |
2011年 | 2312篇 |
2010年 | 1487篇 |
2009年 | 1218篇 |
2008年 | 1665篇 |
2007年 | 1711篇 |
2006年 | 1706篇 |
2005年 | 1587篇 |
2004年 | 1272篇 |
2003年 | 1287篇 |
2002年 | 1129篇 |
2001年 | 603篇 |
2000年 | 543篇 |
1999年 | 527篇 |
1998年 | 325篇 |
1997年 | 355篇 |
1996年 | 292篇 |
1995年 | 274篇 |
1994年 | 231篇 |
1993年 | 161篇 |
1992年 | 198篇 |
1991年 | 165篇 |
1990年 | 149篇 |
1989年 | 91篇 |
1988年 | 88篇 |
1987年 | 79篇 |
1986年 | 62篇 |
1985年 | 60篇 |
1984年 | 58篇 |
1983年 | 22篇 |
1982年 | 26篇 |
1981年 | 23篇 |
1980年 | 16篇 |
1979年 | 14篇 |
1978年 | 11篇 |
1977年 | 9篇 |
1974年 | 9篇 |
1973年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
目的筛选非小细胞肺癌药敏试验的条件。方法取25例非小细胞肺癌患者的瘤细胞,用四甲基偶氮唑盐(MTT)法观察9种化疗药物,在不同浓度、不同时间对瘤细胞的敏感性。结果9种化疗药物对瘤细胞的敏感性,有随着药物浓度的增加、作用时间的延长而增高的趋势,但每个药物都有各自的特点。结论非小细胞肺癌细胞MTT法药敏试验的浓度应为临床用药量的计算值,药物作用时间应以48h为宜。 相似文献
63.
报道58例非心脏手术的围手术期心脏起搏临床应用,重点讨论围手术期心脏起搏的方法与适应症。认为经静脉右室起搏疗效恒定可靠,适应症范围广。对伴有缓慢型或快速型心律失常的心脏病或潜在心脏病患者,围手术期心脏起搏适应症可适当放宽,以确保麻醉手术顺利进行 相似文献
64.
Yves Bécouarn Binh Nguyen Bui René Brunet Alain Ravaud 《Cancer chemotherapy and pharmacology》1991,29(2):159-163
Summary A total of 2,238 new cancer patients were treated in our institution in 1988; among the 423 (18.9%) who were>70 years old, 51 underwent chemotherapy. The median age was 75.8 years, and the Karnofsky performance status (KPS) was 70% for 40 patients. Malignancies were hematopoietic in 24 cases (47%) and digestive in 15 patients (29%), and 12 subjects (24%) had other types of cancers. The first chemotherapy course was given at the full dose to 23/51 (45.1%) patients. The drug dose was reduced for 28/51 (54.9%) patients, due in 25 cases to the subjects being>70 years old. Neither age, KPS, pretreatment assessment, nor cancer extent was correlated with the modifications made to the first cycle. An overall toxicity of grade 3+4 (WHO grading scale) was noted in 10 subjects (19.6%). Although these elderly patients were probably selected, analysis of their charts did not evidence an increase in chemotherapy toxicity, regardless of the dose they received.Presented at the EORTC Pharmacokinetics and Metabolism Group Meeting, Bordeaux, November 1990 相似文献
65.
René A. de Vries Margriet M. E. Kremer-Schneider Marten H. Otten M.D. 《Abdominal imaging》1991,16(1):283-285
The diagnosis of extensive intramural hematoma of the esophagus due to a bicycle trauma was considerably delayed because symptoms did not develop until 6 h after the accident. This report underscores the importance of a barium meal and computed tomographic (CT) scan in cases of unexplained chest pain, even after minor trauma. 相似文献
66.
1314例育龄妇女缺铁性贫血发病现状调查 总被引:2,自引:0,他引:2
目的 :研究育龄妇女缺铁性贫血 (IDA)的发病现状及营养状况与IDA的关系。方法 :检测青岛市城市及农村 1314例妊娠期和非妊娠期育龄妇女的外周血红蛋白浓度 (Hb)、平均红细胞体积 (MCV)、平均红细胞血红蛋白量 (MCH)、血清铁蛋白 (SF) ,并进行个人问卷调查 ,应用营养计算软件评价膳食营养。结果 :1314例育龄妇女IDA发病率为 2 0 .4 0 % ,其中非孕妇的发病率高于孕妇。农村育龄妇女的发病率明显高于城市。孕妇中孕≥ 2 8周组发病率最高 (4 0 % ) ,与其他孕周组相比差异有高度显著性 (P <0 .0 1)。营养评价结果显示非孕妇组热量、维生素A、E、B1、B2 、PP、C的缺乏率高于孕妇组(P <0 .0 0 1)。结论 :农村育龄妇女及孕 2 8周以上的孕妇为IDA高发人群。应加强对农村育龄妇女的膳食营养宣教及指导 ,对孕晚期的孕妇及时采取有针对性的干预措施。 相似文献
67.
Regular physical activity promotes cardiorespiratory fitness and has been considered a cornerstone for non-pharmacological treatment of more than 17 million Americans with diabetes mellitus. Physical exercise has been shown to positively affect certain cardiovascular risk factors such as insulin resistance, glucose metabolism, blood pressure and body fat composition, which are closely associated with diabetes and heart disease. With the increasingly sedentary life style in our society, routine daily exercise of moderate intensity is highly recommended to reduce cardiovascular risk, the leading cause of death in diabetic patients. Exercise produces many beneficial effects to the heart function such as reduced incidence of coronary heart disease, attenuated severity of diabetic cardiomyopathy, improved cardiac performance, cardiac reserve and autonomic regulation. Nevertheless, many diabetic patients do not appear to gain much benefit from exercise or may even be at risk of performing physical exercise. This review summarizes the benefit and risk of exercise on diabetic heart function, with a special emphasis on myocardial and autonomic function. 相似文献
68.
Tania Crombet Marta Osorio Teresa Cruz Carlos Roca Ramón del Castillo Rosa Mon Normando Iznaga-Escobar René Figueredo James Koropatnick Enrique Renginfo Eduardo Fernández Daniel Alvárez Olga Torres Mayra Ramos Idrissa Leonard Rolando Pérez Agustín Lage 《Journal of clinical oncology》2004,22(9):1646-1654
PURPOSE: To evaluate safety and preliminary efficacy of the humanized anti-epidermal growth factor receptor monoclonal antibody h-R3 in combination with radiotherapy (RT) in unresectable head and neck cancer patients. Secondary end points were the measurement of h-R3 serum levels and the assessment of the potential mechanisms of antitumor effect on patient biopsies. Anti-idiotypic response to h-R3 was assessed. To predict pharmacologic effect, a mathematical model for antibodies recognizing antigens expressed in tumors and normal tissues was built. PATIENTS AND METHODS: Twenty-four patients with advanced carcinomas of the head and neck received six once-weekly infusions of h-R3 at four dose levels in combination with RT. Pretreatment tumor biopsies were obtained to evaluate epidermal growth factor receptor expression as an enrollment criterion. Second biopsies were taken to evaluate the proliferative activity and angiogenesis in comparison with the pretreatment samples. Patient serum samples were collected to measure h-R3 levels and anti-idiotypic response. RESULTS: The combination of h-R3 and RT was well tolerated. Antibody-related adverse events consisted in infusion reactions. No skin or allergic toxicity appeared. Overall survival significantly increased after the use of the higher antibody doses. Immunohistochemistry studies of tumor specimens before and after treatment revealed that antitumor response correlated with antiproliferative and antiangiogenic effect. One patient developed antibodies to h-R3. The mathematical model predicted that the maximum difference between the area under the curve in tumors and normal tissues is reached when the antibody has intermediate affinity. CONCLUSION: h-R3 is a well-tolerated drug that may enhance radiocurability of unresectable head and neck neoplasms. 相似文献
69.
70.
目的 观察单纯疱疹病毒胸苷激酶基因(HSV-tk)-环丙氧苷(GCV)系统在胶质瘤基因治疗过程中,GCV能否诱导转导有HSV-tk基因的胶质瘤细胞凋亡。方法 采用光镜、电镜和荧光显微镜观察转导有HSV-tk基因的大鼠C6/tk胶质瘤细胞形态学的改变,以末转导HSV-tk基因的C6细胞作为对照,并以流式细胞术,DNA凝胶电流分析进一步验证细胞凋亡的发生。结果 在5μg/ml GCV作用72h后,C6 相似文献