全文获取类型
收费全文 | 1960篇 |
免费 | 147篇 |
国内免费 | 31篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 80篇 |
妇产科学 | 9篇 |
基础医学 | 240篇 |
口腔科学 | 24篇 |
临床医学 | 205篇 |
内科学 | 377篇 |
皮肤病学 | 12篇 |
神经病学 | 194篇 |
特种医学 | 96篇 |
外科学 | 135篇 |
综合类 | 19篇 |
一般理论 | 2篇 |
预防医学 | 405篇 |
眼科学 | 20篇 |
药学 | 239篇 |
中国医学 | 1篇 |
肿瘤学 | 68篇 |
出版年
2023年 | 8篇 |
2022年 | 22篇 |
2021年 | 45篇 |
2020年 | 23篇 |
2019年 | 33篇 |
2018年 | 63篇 |
2017年 | 40篇 |
2016年 | 37篇 |
2015年 | 44篇 |
2014年 | 65篇 |
2013年 | 76篇 |
2012年 | 129篇 |
2011年 | 98篇 |
2010年 | 67篇 |
2009年 | 68篇 |
2008年 | 89篇 |
2007年 | 124篇 |
2006年 | 112篇 |
2005年 | 99篇 |
2004年 | 80篇 |
2003年 | 49篇 |
2002年 | 73篇 |
2001年 | 68篇 |
2000年 | 85篇 |
1999年 | 62篇 |
1998年 | 43篇 |
1997年 | 29篇 |
1996年 | 18篇 |
1995年 | 26篇 |
1994年 | 27篇 |
1993年 | 17篇 |
1992年 | 31篇 |
1991年 | 47篇 |
1990年 | 28篇 |
1989年 | 32篇 |
1988年 | 26篇 |
1987年 | 24篇 |
1986年 | 17篇 |
1985年 | 20篇 |
1984年 | 19篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 8篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1972年 | 3篇 |
1970年 | 3篇 |
排序方式: 共有2138条查询结果,搜索用时 15 毫秒
101.
C.N.M. Brouwer M.M. Rovers A.R. Maill R.H. Veenhoven D.E. Grobbee E.A.M. Sanders A.G.M. Schilder 《Clinical otolaryngology》2005,30(3):258-265
Objective: To assess the quality of life of 384 Dutch children aged 1–7 years with recurrent acute otitis media (AOM), and compare it with that of children from four reference populations: (i) children from a general population; (ii) children with mild‐to‐moderate asthma, (iii) children with mild‐to‐moderately severe chronic illness, and (iv) US children with persistent or recurrent otitis media. Design: Survey. Setting: A general and an academic hospital (study population of children with recurrent AOM, n = 384); general population (n = 225 and 117); primary care (children with asthma, n = 64); community care (children with chronic illness, n = 82); and a general hospital (children with persistent or recurrent otitis media, n = 169). Participants: A total of 384 children aged 1–7 years who had experienced at least two episodes of AOM in the preceding year and their caregivers. Main outcome measures: Generic and disease‐specific quality of life as judged by the children's caregivers. Age‐adjusted total and subscale scores were compared with those of the reference populations. Results: For all generic questionnaires, children with recurrent AOM had poorer scores than children from the general population. Quality of life of children with four or more episodes of AOM in the preceding year was poorer than that of children with two to three episodes. Children with recurrent AOM scored lower on the health‐related questionnaire than children with mild‐to‐moderately severe chronic illness. Quality of life of the present study population was similar to those of children with asthma and US children with chronic otitis media with effusion or recurrent AOM. Conclusion: Recurrent AOM has a considerable negative impact on the quality of life of children and causes concern to their caregivers. These effects are proportional to the severity of the condition. Professionals involved in the care of children with OM should be aware that OM not only affects physical functioning but also general well‐being of the child and its family. These outcomes should therefore be included in the evaluation of the child with otitis media both in the clinical and research setting. 相似文献
102.
Steffanie A. Strathdee Wendy Davila Fraga Patricia Case Michelle Firestone Kimberly C. Brouwer Saida Gracia Perez Carlos Magis Miguel Angel Fraga 《Journal of urban health》2005,82(4):iv58-iv73
Injection drug use is a growing problem on the US-mexico border, where Tijuana is situated. We studied the context of injection drug use among injection drug users (IDUs) in Tijuana to help guide future research and interventions. Guided indepth interviews were conducted with 10 male and 10 female current IDUs in Tijuana. Topics included types of drug used, injection settings, access to sterile needles, and environmental influences. Interviews were taped, transcribed verbatim, and translated. Content analysis was conducted to identify themes. Of the 20 IDUs, median age and age at first injection were 30 and 18. Most reported injecting at least daily: heroin (“carga,” “chiva”, “negra”), methamphetamine (“crico,” “cri-cri”), or both drugs combined. In sharp contrast to Western US cities, almost all regularly attended shooting galleries (“yongos” or “picaderos”) because of the difficulties obtaining syringes and police oppression. Almost all shared needles/paraphernalia [“cuete” (syringe), “cacharros” (cookers), cotton from sweaters/socks (filters)]. Some reported obtaining syringes from the United States. Key themes included (1) pharmacies refusing to sell or charging higher prices to IDUs, (2) ample availability of used/rented syringes from “picaderos” (e.g., charging approximately 5 pesos or “10 drops” of drug), and (3) poor HIV/AIDS knowledge, such as beliefs that exposing syringes to air “kills germs.” This qualitative study suggests that IDUs in Tijuana are at high risk of HIV and other blood-borne infections. Interventions are urgently needed to expand access to sterile injection equipment and offset the potential for a widespread HIV epidemic. 相似文献
103.
Petra M C Callenbach René F M de Coo Alla A Vein Willem Frans M Arts Jan Oosterwijk Gerard Hageman Robert ten Houten Gisela M Terwindt Dick Lindhout Rune R Frants Oebele F Brouwer 《European journal of paediatric neurology》2002,6(5):269-283
Benign familial infantile convulsions (BFIC) is a recently identified partial epilepsy syndrome with onset between 3 and 12 months of age. We describe the clinical characteristics and outcome of 43 patients with BFIC from six Dutch families and one Dutch-Canadian family and the encountered difficulties in classifying the syndrome. Four families had a pure BFIC phenotype; in two families BFIC was accompanied by paroxysmal kinesigenic dyskinesias; in one family BFIC was associated with later onset focal epilepsy in older generations. Onset of seizures was between 6 weeks and 10 months, and seizures remitted before the age of 3 years in all patients with BFIC. In all, 29 (67%) of the 43 patients had been treated with anti-epileptic drugs for a certain period of time. BFIC is often not recognized as (hereditary) epilepsy by the treating physician. Seizures often remit shortly after the start of anti-epileptic drugs but, because of the benign course of the syndrome and the spontaneous remission of seizures, patients with low seizure frequency do not necessarily have to be treated. If prescribed, anti-epileptic drugs can probably be withdrawn after 1 or 2 years of seizure freedom. 相似文献
104.
105.
Noyez L Verheugt FW Peppelenbosch AG Skotnicki SH Brouwer MH 《Nederlands tijdschrift voor geneeskunde》2000,144(39):1874-1877
OBJECTIVE: To determine how the mortality and morbidity after aortocoronary bypass surgery during the hospital stay correspond with those in the first 6 months after the operation. DESIGN: Prospective and retrospective. METHOD: Data of 563 patients undergoing isolated myocardial revascularization in 1998 in the Academic Hospital Nijmegen, the Netherlands, were collected on mortality and morbidity 180 days after the operation. The Parsonnet score was used to assess the operative risk of the patients. RESULTS: The patient group consisted of 422 males and 141 females, with a mean age of 64.3 years. The median Parsonnet score was 6 (range: 0-50). The mean hospital stay was 7.9 days (SD: 9.4). The hospital mortality was 3.9% (22/563). The follow-up was 100%. During the follow-up 11 patients died, 10 from cardiac causes. Six months postoperatively the mortality was 5.9% (22/563). The Kaplan-Meier curve of the survival probability rate showed a persistent decrease, mainly in the higher risk patients. Non-fatal cardiovascular events were registered in 9.6% of the surviving patients (51/530). CONCLUSION: The hospital mortality and morbidity after aortocoronary bypass surgery were considerably lower than the total postoperative mortality and morbidity during the first 6 months after the operation. For assessment of the postoperative course, systematic follow-up over 6 months is necessary. 相似文献
106.
The international collaborative study of maternal phenylketonuria: status report 1994 总被引:1,自引:0,他引:1
R Koch HL Levy R Matalon B Rouse WB Hanley F Trefz C Azen EG Friedan F de la Cruz F Güttler PB Acosta 《Acta paediatrica (Oslo, Norway : 1992)》1994,83(S407):111-119
Neonatal screening for phenylketonuria (PKU) has created a problem as females with PKU are reaching child-bearing age. Surveys have revealed that maternal phenylalanine blood concentrations greater than 1200 μmol/l are associated with fetal microcephaly, congenital heart defects and intrauterine growth retardation. It is estimated that as many as 3000 hyperphenylalaninemic females may be at risk of producing these fetal abnormalities. To examine this problem, the international maternal PKU collaborative study was developed to evaluate the efficacy of a phenylalanine-restricted diet in reducing fetal morbidity. Preliminary findings have indicated that phenylalanine restriction should begin before conception for females with PKU planning a pregnancy. Dietary control should maintain maternal blood phenylalanine levels between 120 and 360 μmol/l and should provide adequate energy, protein, vitamin and mineral intake. Pregnant hyperphenylalaninemic females who achieved metabolic control after conception or by the 10th week of pregnancy had a better offspring outcome than anticipated. The results of 402 pregnancies are reviewed. 相似文献
107.
When women smokers become pregnant, they are asked to control weight gain and at the same time to relinquish an addictive drug with weight suppressing effects. For women with serious body image concerns or a history of unhealthful eating patterns, smoking cessation may be particularly problematic. To investigate the relationship of weight concerns with smoking and weight gain during pregnancy and postpartum weight loss strategies, we conducted a retrospective study of women who had given birth to their first child within the past 10 years and were smokers when they became pregnant. We observed that women smokers with high weight and body image concerns (HC) gained significantly more weight during pregnancy-in amounts that far exceeded maximum recommended weight gain-than did women with low concerns (LC). HC were more likely to adopt smoking as a weight-control strategy and to be receptive to multiple weight-control strategies. Although they lost significantly more weight in the first month postpartum than did LC, they had also gained significantly more during pregnancy; the net result was that weight loss as a percentage of weight gained did not differ significantly between groups. HC were significantly less likely to experience food cravings in the first trimester and marginally less likely to vomit than LC. We conclude that early identification of high-risk women, coordination of prenatal care with smoking cessation counseling, and development of effective relapse prevention strategies that specifically address weight issues both during and after pregnancy will be needed if efforts to reduce smoking during pregnancy and postpartum are to be optimized. 相似文献
108.
109.
Wilfried M. Brouwer Pieter Piet Anton L. German 《Macromolecular chemistry and physics.》1984,185(2):363-375
Polymeric catalysts consisting of cobalt(II)phthalocyanine, CoPc(NaSO3)4, coordinatively bound to poly(vinylamine) of various molecular weight, were used as oxidation catalysts in the conversion of thiols to disulfides. The molecular weight of the polymeric ligand, poly(vinylamine), largely affects the reaction rate below a critical polymer concentration of about 0,01 w/v%. The activation enthalpy ΔH does not depend on the degree of polymerization (DP) of the polymeric ligand and from visible light spectra it appears that electron transfer of the thiolanion to Co(II) to yield Co(I) is favored when low instead of high molecular weight ligands are used. The observed catalytic oxidation rate of thiol is considerably higher for low molecular weight ligands (DP 20 – 40) in the low polymer concentration region. This may be attributed to a change in base strength in the micro-environment of CoPc(NaSO3)4 due to conformational differences between low and high molecular weight ligands, manifested at low polymer concentration. When the ligand has no polymeric character, e. g. 1, 3-propanediamine, low catalytic activity is observed. 相似文献
110.
BACKGROUND: Increasing life expectancy and decreasing marginal valuation of additional QALYs over time may serve as a basis for discounting future health effects from a societal perspective. Therefore, we tested the hypothesis that societal time preference for health is related to perceived future life expectancy. METHODS: A sample of 223 people from the general population prioritised healthcare programmes with differential timing of health benefits and costs from a societal perspective. Furthermore, we asked respondents to estimate future life expectancy. RESULTS: The relationship between future life expectancy and time preference for health is ambiguous. We observed that people who expected a higher future life expectancy elicited higher discount rates for health effects than those with lower life expectancy growth expectations for all four time periods (5, 10, 20 and 40 years into the future), but the differences were never significant. On average, providing explicit information on growth in life expectancy did significantly alter discount rates in the expected direction but, on an individual level, the results were rather inconsistent. We observed a significantly stronger time preference (i.e. higher discount rates) for health effects than for costs. As commonly observed, discount rates for health and money decreased with time delay following a hyperbolic function. CONCLUSION: Our data indicate that it is troublesome to elicit societal discount rates empirically, especially rates that are in line with the theoretical arguments on societal discounting. The influence of life expectancy remains ambiguous, but there seems to be at least some positive relationship between growth in life expectancy and discount rates that deserves additional attention. 相似文献