全文获取类型
收费全文 | 12958篇 |
免费 | 1112篇 |
国内免费 | 105篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 100篇 |
妇产科学 | 978篇 |
基础医学 | 910篇 |
口腔科学 | 109篇 |
临床医学 | 1765篇 |
内科学 | 1435篇 |
皮肤病学 | 142篇 |
神经病学 | 346篇 |
特种医学 | 147篇 |
外国民族医学 | 1篇 |
外科学 | 1258篇 |
综合类 | 1373篇 |
现状与发展 | 3篇 |
一般理论 | 2篇 |
预防医学 | 3892篇 |
眼科学 | 15篇 |
药学 | 776篇 |
13篇 | |
中国医学 | 222篇 |
肿瘤学 | 674篇 |
出版年
2024年 | 29篇 |
2023年 | 215篇 |
2022年 | 414篇 |
2021年 | 560篇 |
2020年 | 567篇 |
2019年 | 530篇 |
2018年 | 509篇 |
2017年 | 510篇 |
2016年 | 544篇 |
2015年 | 431篇 |
2014年 | 795篇 |
2013年 | 1448篇 |
2012年 | 782篇 |
2011年 | 772篇 |
2010年 | 629篇 |
2009年 | 639篇 |
2008年 | 611篇 |
2007年 | 572篇 |
2006年 | 495篇 |
2005年 | 442篇 |
2004年 | 395篇 |
2003年 | 328篇 |
2002年 | 289篇 |
2001年 | 270篇 |
2000年 | 242篇 |
1999年 | 178篇 |
1998年 | 172篇 |
1997年 | 155篇 |
1996年 | 112篇 |
1995年 | 74篇 |
1994年 | 66篇 |
1993年 | 47篇 |
1992年 | 45篇 |
1991年 | 45篇 |
1990年 | 32篇 |
1989年 | 20篇 |
1988年 | 21篇 |
1987年 | 29篇 |
1986年 | 19篇 |
1985年 | 24篇 |
1984年 | 30篇 |
1983年 | 16篇 |
1982年 | 12篇 |
1981年 | 14篇 |
1980年 | 10篇 |
1979年 | 9篇 |
1978年 | 6篇 |
1977年 | 10篇 |
1976年 | 6篇 |
1967年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
BACKGROUND: The reasons for mis-reporting food consumption warrant investigation. OBJECTIVE: To document intention to mis-report food consumption and its associations with psychological measures in women. DESIGN: A total of 184 female volunteers aged 18-65 years, comprising 50 seeking help in primary care to lose weight with a body mass index (BMI) >/=30 kg m(-2) (obese-clinical group) and 134 nurses (nonclinical groups) (BMI <25 kg m(-2), n = 52; BMI 25-29.9 kg m(-2), n = 45; BMI >/=30 kg m(-2), n = 37) were studied. A questionnaire was administered containing three psychological tests (self-esteem, psychological well-being and Stunkard's three-factor eating questionnaire) and new items to address food intake mis-reporting. RESULTS: Overall, 68% of participants declared an inclination to mis-report (64% nonclinical, 78% clinical). Inclination to under-report was 29, 33 and 51% in the three nonclinical groups; and 46% among the obese clinical patients. Among the same groups, inclination to over-report were 39, 29, 11 and 32%. After adjusting for social deprivation and BMI, women inclined to mis-report had higher hunger (P = 0.008) and disinhibition (P = 0.005) scores than those intending to report accurately. These variables were associated with current dieting, frequency of dieting, self-reported bingeing and dissatisfaction with body weight. CONCLUSIONS: These findings indicate that intentional under-reporting and over-reporting of food consumption are common in women of all BMI categories and are associated with eating behaviour. Current dieting, frequency of dieting in the past, self-reported bingeing and dissatisfaction with body weight seem to mediate this relationship. 相似文献
12.
j. gonenne t. esfandyari m. camilleri d. d. burton d. a. stephens k. l. baxter a. r. zinsmeister † & a. e. bharucha 《Neurogastroenterology and motility》2006,18(10):911-918
Females are disproportionately affected by constipation, which is often aggravated during pregnancy. Bowel function also changes during the luteal phase of the menstrual cycle. The aim was to compare the effects of acute administration of female sex steroids on gastric emptying, small bowel transit and colonic transit in healthy postmenopausal subjects. A second aim was to determine whether withdrawal of the hormones was associated with a change in transit. Forty-nine postmenopausal females were randomized to receive for 7 days 400 mg day(-1) micronized progesterone, 0.2 mg day(-1) oestradiol, combination of the two, or placebo. Treatment groups were balanced on age. Participants underwent whole gut transit measurement by scintigraphy using a 99m-labeled technetium-egg meal and 111-labeled indium-charcoal via a delayed-release capsule. Transit measurement was repeated after withdrawal of the study medications. The primary endpoints were ascending colon (AC) emptying half-life time (t1/2) and colonic geometric centre (GC) at 24 h. Secondary analysis variables were GC at 4 and 48 h, gastric emptying t1/2 and colonic filling at 6 h. There was a significant overall effect of progesterone on colonic transit with shorter AC emptying t1/2 and significantly greater colonic GC at 48 h. No transit endpoints were altered by oestradiol or combined hormonal treatment relative to placebo. Oestradiol and progesterone resulted in looser stool consistency. Withdrawal of the hormone supplement was not associated with significant alteration in transit. Micronized progesterone does not retard colonic transit in postmenopausal females. 相似文献
13.
The Relationship Between Daily Life Stress and Gastrointestinal Symptoms in Women with Irritable Bowel Syndrome 总被引:3,自引:0,他引:3
Rona L. Levy Kevin C. Cain Monica Jarrett Margaret M. Heitkemper 《Journal of behavioral medicine》1997,20(2):177-193
Research on irritable bowel syndrome (IBS), a functional disorder of the gastrointestinal (GI) system, has linked GI symptoms to stress. This study examined the relationship between daily stress and GI symptoms across women and within woman in IBS patients (n = 26), IBS nonpatients (IBS-NP; n = 23), and controls (n = 26), controlling for menstrual cycle phase. Women (ages 20–45) completed daily health diaries for two cycles in which they monitored daily GI symptoms and stress levels. The Life Event Survey (LES) was used as a retrospective measure of self-reported stress. The across-women analyses showed higher mean GI symptoms and stress in the IBS and IBS-NP groups relative to controls but no group differences in LES scores. The within-woman analyses found a significant and positive relationship between daily stress and daily symptoms in both the IBS-NP and the IBS groups. Controlling for menstrual cycle had no substantial impact on the results. 相似文献
14.
目的探讨产后出血的原因与护理、预防的方法,确保产妇安全。方法回顾性分析本组产妇分娩后大出血的病情观察、护理、治疗和预防的方法。结果经过精心护理和积极治疗,及时止血,解除了病人的紧张情绪,117例病人平均住院8d,均痊愈出院。结论加强对产妇,特别是产后出血病人的护理,对预防和及时控制出血,加快病人康复有重要意义。 相似文献
15.
The authors carried out research on breast volume and body surface anatomy of 125 women. As a result, an average breast volume
for Chinese women was obtained (325.36 ± 12.66 ml), and a table with several linear equations for calculating breast volume
was derived. The authors applied these results to their clinical work and succeeded in making mammaplasty more precise in
178 patients. 相似文献
16.
17.
Cyclic hormonal replacement therapy after the menopause: Transdermal versus oral treatment 总被引:2,自引:0,他引:2
M. Cortellaro T. Nencioni C. Boschetti S. Ortolani F. Buzzi B. Francucci M. P. Caraceni P. Abelli F. Polvani C. Zanussi 《European journal of clinical pharmacology》1991,41(6):555-559
Summary In an open, randomized, comparative, between-patient trial, 45 postmenopausal women were treated for 4 months with cyclical transdermal oestradiol 0.05 mg per day or oral conjugated equine oestrogens 0.625 mg per day, in both cases, plus, medroxyprogesterone acetate 10 mg per day on the last 8 days of each cycle. Similar relief from postmenopausal symptoms was obtained with both treatments. Post-treatment histological evaluation of the endometrium did not reveal neoplastic or hyperplastic change in any patient.Early follicular-phase plasma oestradiol levels were observed only after transdermal oestradiol. There was a significant reduction in serum total cholesterol and LDL cholesterol in both treatment groups, with no difference between treatments, whereas serum triglyceride levels were decreased only by transdermal oestradiol. Plasma calcium and phosphorus fell significantly and serum intact parathyroid hormone rose significantly, with no difference between the therapies. No significant changes were observed in clotting factors.Transdermal oestradiol appears to be an effective and safe hormonal replacement therapy, and this route of administration may be responsible for the more useful action of the drug on serum lipids and plasma oestradiol levels. 相似文献
18.
研究了77例长沙地区孕、产妇的宫颈排毒(CMV)情况及母、婴的免疫状态,并对宫颈排毒及CMV一IgM阳性的母亲所生小孩进行临床追踪。结果显示:孕妇宫颈排毒率为4.5%,抗CMV-IgG和抗CMV-IgM阳性率分别为77%和13%,59例脐血CMV-IgM阴性。宫颈排毒的3例其抗体检测抗CMV-IgG均阳性,抗CMV-IgM仅一例阳性。作者认为,对妊娠期活动性CMV感染的诊断,仅检测抗CMV-IgG和抗CMV-IgM抗体滴度仍不足,尚须结合病毒分离和其它检测手段。 相似文献
19.
ABSTRACT: Background: The percentage of United States’ births delivered by cesarean section has increased rapidly in recent years, even for women considered to be at low risk for a cesarean section. The purpose of this paper is to examine infant and neonatal mortality risks associated with primary cesarean section compared with vaginal delivery for singleton full‐term (37–41 weeks’ gestation) women with no indicated medical risks or complications. Methods: National linked birth and infant death data for the 1998–2001 birth cohorts (5,762,037 live births and 11,897 infant deaths) were analyzed to assess the risk of infant and neonatal mortality for women with no indicated risk by method of delivery and cause of death. Multivariable logistic regression was used to model neonatal survival probabilities as a function of delivery method, and sociodemographic and medical risk factors. Results: Neonatal mortality rates were higher among infants delivered by cesarean section (1.77 per 1,000 live births) than for those delivered vaginally (0.62). The magnitude of this difference was reduced only moderately on statistical adjustment for demographic and medical factors, and when deaths due to congenital malformations and events with Apgar scores less than 4 were excluded. The cesarean/vaginal mortality differential was widespread, and not confined to a few causes of death. Conclusions: Understanding the causes of these differentials is important, given the rapid growth in the number of primary cesareans without a reported medical indication. (BIRTH 33:3 September 2006) 相似文献
20.