全文获取类型
收费全文 | 109014篇 |
免费 | 10830篇 |
国内免费 | 8196篇 |
专业分类
耳鼻咽喉 | 1081篇 |
儿科学 | 1118篇 |
妇产科学 | 1077篇 |
基础医学 | 11311篇 |
口腔科学 | 1727篇 |
临床医学 | 13538篇 |
内科学 | 14489篇 |
皮肤病学 | 1060篇 |
神经病学 | 5053篇 |
特种医学 | 4123篇 |
外国民族医学 | 55篇 |
外科学 | 11287篇 |
综合类 | 21851篇 |
现状与发展 | 22篇 |
一般理论 | 5篇 |
预防医学 | 8528篇 |
眼科学 | 2850篇 |
药学 | 11917篇 |
94篇 | |
中国医学 | 8073篇 |
肿瘤学 | 8781篇 |
出版年
2024年 | 459篇 |
2023年 | 1616篇 |
2022年 | 4306篇 |
2021年 | 5410篇 |
2020年 | 4386篇 |
2019年 | 3589篇 |
2018年 | 3716篇 |
2017年 | 3662篇 |
2016年 | 3392篇 |
2015年 | 5243篇 |
2014年 | 6377篇 |
2013年 | 6037篇 |
2012年 | 8243篇 |
2011年 | 8912篇 |
2010年 | 6226篇 |
2009年 | 4949篇 |
2008年 | 5705篇 |
2007年 | 5849篇 |
2006年 | 5599篇 |
2005年 | 5041篇 |
2004年 | 4311篇 |
2003年 | 4774篇 |
2002年 | 4177篇 |
2001年 | 3389篇 |
2000年 | 2526篇 |
1999年 | 2043篇 |
1998年 | 1282篇 |
1997年 | 1175篇 |
1996年 | 873篇 |
1995年 | 806篇 |
1994年 | 644篇 |
1993年 | 439篇 |
1992年 | 512篇 |
1991年 | 475篇 |
1990年 | 364篇 |
1989年 | 301篇 |
1988年 | 283篇 |
1987年 | 249篇 |
1986年 | 169篇 |
1985年 | 143篇 |
1984年 | 86篇 |
1983年 | 53篇 |
1982年 | 38篇 |
1981年 | 47篇 |
1980年 | 33篇 |
1979年 | 43篇 |
1978年 | 13篇 |
1977年 | 11篇 |
1975年 | 11篇 |
1973年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
目的探讨胃黏膜内pH值对胆源性胰腺炎病情预后评估及在决定手术冶疗中应用的价值。方法对确诊的146例胆源性胰腺炎患者经鼻插入胃黏膜二氧化碳张力计(TRIP-NGS导管)测定胃黏膜内pH值,每隔12小时测定一次,并进行APACHEⅡ评分,将2组数据与外科治疗进行相关分析。结果①pH值变化反映胆源性胰腺炎病情发展变化,与器官衰竭数呈负相关;②外科干预治疗与内科治疗比较差异有统计学意义(P〈0.05);③pHI〉7.25与pH〈7.25患者开腹手术病死率和细菌培养阳性率比较差异有统计学意义(P〈0.05)。结论pH值对胆源性胰腺炎外科治疗有指导意义。外科处理原则是:①胆道无梗阻,以内科保守治疗为主;②伴胆道梗阻,先行经内镜十二指肠乳头括约肌切开术、经内镜鼻胆管引流术、B超导引引流、腹腔灌洗等,如胆道引流不畅或pH值持续下降,则开腹手术。 相似文献
32.
Liang Ying-rui梁英锐Department of Pathology Hunan Medical University Changsha 《中华医学杂志(英文版)》1989,102(1):53-59
The cytoplasm of human bile ductule epithelia was found to be Type V collagen positive, demonstrating that the epithelia were able to generate this type of collagen. The ductules proliferated greatly with Type V collagen positive cytoplasm in piece-meal necrosis of chronic active hepatitis (CAH). The capillary-like bile ductules inside human hepatic lobules were identified. Our findings might explain the mechanism of fibroplasia in CAH. 相似文献
33.
34.
目的 对临床发生的急性输液反应进行分析,找出发生的原因,探讨预防措施。方法对201885例次输液治疗中的52例次输液反应资料进行分析。结果 经分析,属药物因素27例(52%),属操作因素11例(21%),属病人因素11例(21%),属输液器具因素3例(6%)。结论 把好药品和操作关,改善操作环境,严格操作规程是减少输液反应的关键。 相似文献
35.
36.
目的:通过对患者在住院过程中的系统教育,使患者了解自己疾病的知识,提高患者对糖尿病的认知水平和自我管理能力,养成良好的健康行为和生活方式,从而提高生活质量。方法:采用集体、个体、自学等形式进行教育。结果:通过培养,患者掌握了一些基本的操作技能,明显缩短了住院日,同时激发了护士与患者学习专业知识的热情,减少或延缓了并发症的发生。结论:①健康教育是一个护患双边活动过程。②通过教育,可不断提高护士的自身修养和专业知识水平。③健康教育是糖尿病患者学习糖尿病知识,提高自我护理能力的有效途径。 相似文献
37.
Wang Tao Liang Zhihou Sun Shenggang Cao Xuebing Peng Hai Cao Fei Liu Hongjin Tong E-tang 《华中科技大学学报(医学英德文版)》2003,23(2):145-147
Summary To investigate the distribution of possible novel mutations from parkin gene in variant subset of patients with Parkinson’s
disease (PD) in China and explore whether parkin gene plays an important role in the pathogenesis of PD, 70 patients were
divided into early-onset group and late-onset group; 70 healthy subjects were included as controls. Genomic DNA from 70 normal
controls and from those of PD patients were extracted from peripheral blood leukocytes by using standard procedures. Mutations
of parkin gene (exon 1–12) in all the subjects were screened by PCR-single strand conformation polymorphism (SSCP), and further
sequencing was performed in the samples with abnormal SSCP results, in order to confirm the mutation and its location. A new
missense mutation Gly284Arg in a patient and 3 abnormal bands in SSCP electrophoresis from samples of another 3 patients were
found. All the DNA variants were sourced from the samples of the patients with early-onset PD. It was concluded that Parkin
point mutation also partially contributes to the development of early-onset Parkinson’s disease in Chinese.
WANG Tao, male, born in 1961, Associate Professor
This work was supported by grants from the key program of the special scientific project of Scientific & Technologic Agency
of Hubei Province (Serial No. 2001AA308B01) and the Hygienic Research Project of Hygienic Agency of Hubei province (Serial
No. WJ 01529). 相似文献
38.
L H Daltroy C B Phillips H M Eaton M G Larson A J Partridge M Logigian M H Liang 《American journal of public health》1995,85(4):558-560
The Physical Capacity Evaluation, a performance measure of functional capabilities comprised of 13 tasks simulating those used in activities of daily living, was tested on 289 community-dwelling elderly people and compared against a widely used self-report measure of function, the Health Assessment Questionnaire. Factor analysis identified one dominant component in each instrument. Internal consistency reliability (Cronbach's alpha) was .90 for both instruments. Global disability (Health Assessment Questionnaire) and function (Physical Capacity Evaluation) scores were correlated -.74. One-week retest reliabilities on 58 subjects were .94 for the Physical Capacity Evaluation and .95 for the Health Assessment Questionnaire. The Physical Capacity Evaluation is a valid and reliable measure of physical performance for use with elderly people. 相似文献
39.
40.
BACKGROUND: Chronic renal failure (CRF) is associated with an atherogenic
lipid profile and an increased risk of ischaemic cardiovascular disease.
The associated hyperlipidaemia is reportedly ameliorated by erythropoietin
(Epo) therapy. According to a recent report, rats studied 3 weeks after 5/6
nephrectomy and fed a high- protein diet exhibited increased activities of
hepatic HMG-CoA reductase (HMG-CoAR) and cholesterol 7 alpha-hydroxylase
(Ch-7 alpha- H), despite normal corresponding mRNA values. DESIGN AND
METHODS: This study was designed to examine the effects of naturally
progressing CRF of longer duration as well as those of Epo therapy on gene
expressions of the key factors involved in hepatic cholesterol metabolism,
i.e., LDL receptor (LDLR), HMG-CoAR, and Ch-7 alpha-H. Sprague-Dawley rats
were randomized to the CRF group (5/6 nephrectomy), Epo-treated CRF group
(given Epo 150 U/kg/twice weekly) and sham-operated, placebo- treated
normal controls. They were allowed free access to regular rat chow and
studied 6 weeks after surgery. Liver mRNAs and protein mass or activities
of the above factors were studied. RESULTS: Plasma cholesterol
concentration was significantly increased in the CRF group (P < 0.001)
and was modestly lowered (P < 0.05) by Epo therapy. However, microsomal
cholesterol concentration and LDLR, HMG-CoAR, and Ch-7 alpha-H mRNA as well
as HMG-CoAR activity, and Ch-7 alpha-H and LDLR protein mass measurements
were virtually identical in the three groups. Thus, hepatic LDLR, HMG-CoAR,
and Ch-7 alpha-H mRNA and protein measurements in rats with CRF were
similar to those of the normal control group representing an inappropriate
response to the associated hypercholesterolemia. Epo therapy led to partial
amelioration of CRF- associated hypercholesterolaemia with no discernible
effect on hepatic tissue expression of the above factors.
相似文献