全文获取类型
收费全文 | 17479篇 |
免费 | 1049篇 |
国内免费 | 117篇 |
专业分类
耳鼻咽喉 | 267篇 |
儿科学 | 405篇 |
妇产科学 | 293篇 |
基础医学 | 2488篇 |
口腔科学 | 1765篇 |
临床医学 | 1388篇 |
内科学 | 3694篇 |
皮肤病学 | 420篇 |
神经病学 | 1239篇 |
特种医学 | 525篇 |
外科学 | 1834篇 |
综合类 | 138篇 |
一般理论 | 4篇 |
预防医学 | 1973篇 |
眼科学 | 175篇 |
药学 | 1310篇 |
中国医学 | 177篇 |
肿瘤学 | 550篇 |
出版年
2023年 | 164篇 |
2022年 | 436篇 |
2021年 | 657篇 |
2020年 | 449篇 |
2019年 | 549篇 |
2018年 | 686篇 |
2017年 | 568篇 |
2016年 | 539篇 |
2015年 | 697篇 |
2014年 | 869篇 |
2013年 | 976篇 |
2012年 | 1425篇 |
2011年 | 1585篇 |
2010年 | 868篇 |
2009年 | 665篇 |
2008年 | 1019篇 |
2007年 | 1068篇 |
2006年 | 837篇 |
2005年 | 712篇 |
2004年 | 599篇 |
2003年 | 500篇 |
2002年 | 415篇 |
2001年 | 291篇 |
2000年 | 261篇 |
1999年 | 207篇 |
1998年 | 141篇 |
1997年 | 117篇 |
1996年 | 101篇 |
1995年 | 84篇 |
1994年 | 94篇 |
1993年 | 68篇 |
1992年 | 94篇 |
1991年 | 92篇 |
1990年 | 71篇 |
1989年 | 78篇 |
1988年 | 73篇 |
1987年 | 47篇 |
1986年 | 59篇 |
1985年 | 53篇 |
1984年 | 33篇 |
1983年 | 43篇 |
1982年 | 18篇 |
1980年 | 34篇 |
1979年 | 34篇 |
1978年 | 19篇 |
1977年 | 21篇 |
1976年 | 21篇 |
1975年 | 21篇 |
1973年 | 20篇 |
1968年 | 32篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
It is widely believed that the improved survival of young people with chronic diseases will be associated with the development of appropriate services within the adult healthcare domain. There is, however, little evidence to suggest that this is happening at a rate commensurate with clinical requirements. This paper highlights the multiplicity of barriers that impede the development of transition services to facilitate the transfer of medical care from the paediatric to the adult domain. Different models of transition care are described, and the terms 'transfer' and 'transition' are differentiated. The clinical demand for service development is highlighted, as well as the need for specific research in this area of healthcare delivery. 相似文献
82.
SK Roy AM Tomkins SM Akramuzzaman RH Behrens R Haider D Mahalanabis G Fuchs 《Archives of disease in childhood》1997,77(3):196-200
OBJECTIVE: To evaluate the impact of zinc supplementation on the clinical course, stool weight, duration of diarrhoea, changes in serum zinc, and body weight gain of children with acute diarrhoea. DESIGN: Randomised double blind controlled trial. Children were assigned to receive zinc (20 mg elemental zinc per day) containing multivitamins or control group (zinc-free multivitamins) daily in three divided doses for two weeks. SETTING: A diarrhoeal disease hospital in Dhaka, Bangladesh. PATIENTS: 111 children, 3 to 24 months old, below 76% median weight for age of the National Center for Health Statistics standard with acute diarrhoea. Children with severe infection and/or oedema were excluded. MAIN OUTCOME MEASURES: Total diarrhoeal stool output, duration of diarrhoea, rate of weight gain, and changes in serum zinc levels after supplementation. RESULTS: Stool output was 28% less and duration 14% shorter in the zinc supplemented group than placebo (p = 0.06). There were reductions in median total diarrhoeal stool output among zinc supplemented subjects who were shorter (less than 95% height for age), 239 v 326 g/kg (p < 0.04), and who had a lower initial serum zinc (< 14 mmol/l), 279 v 329 g/kg (p < 0.05); a shortening of mean time to recovery occurred (4.7 v 6.2 days, p < 0.04) in those with lower serum zinc. There was an increase in mean serum zinc in the zinc supplemented group (+2.4 v -0.3 mumol/l, p < 0.001) during two weeks of supplementation, and better mean weight gain (120 v 30 g, p < 0.03) at the time of discharge from hospital. CONCLUSIONS: Zinc supplementation is a simple, acceptable, and affordable strategy which should be considered in the management of acute diarrhoea and in prevention of growth faltering in children specially those who are malnourished. 相似文献
83.
WG Mitchell H Lynn JF Bale MA Maeder SM Donfield B Garg AH Tilton JK Willis TP Bohan 《Pediatrics》1997,100(5):817-824
BACKGROUND: Boys and young men with hemophilia treated with factor infusions before 1985 had a substantial risk of acquiring the human immunodeficiency virus (HIV) and the acquired immunodeficiency syndrome. This study was designed to assess the effects of HIV and hemophilia per se on neurological function in a large cohort of subjects with hemophilia, and to investigate the relationships between neurological disease and death during follow-up. METHODS: Three hundred thirty-three boys and young men (207 HIV seropositive and 126 HIV seronegative) were evaluated longitudinally in a multicenter, multidisciplinary study. Neurological history and examination were conducted at baseline and annually for 4 years. The relationship between neurological variables, HIV serostatus, CD4+ cell counts, and vital status at the conclusion of the study was examined using logistic regression models. RESULTS: The risks of nonhemophilia-associated muscle atrophy, behavior change, and gait disturbance increased with time in immune compromised HIV-seropositive subjects compared with HIV seronegative or immunologically stable HIV-seropositive subjects. The risk of behavior change in immune compromised HIV-seropositive hemophiliacs, for example, rose to 60% by year 4 versus 10% to 17% for the other study groups. Forty-five subjects (13.5%), all of whom were HIV seropositive, died by year 4. Subjects who died had had increased risks of hyperreflexia, nonhemophilia-associated muscle atrophy, and behavior change. CONCLUSIONS: These results indicate that immune compromised, HIV-seropositive hemophiliacs have high rates of neurological abnormalities over time and that neurological abnormalities were common among subjects who later died. By contrast, immunologically stable HIV-seropositive subjects did not differ from the HIV-seronegative participants. Hemophilia per se was associated with progressive abnormalities of gait, coordination, and motor function. 相似文献
84.
I. B. Vergote C. F. De Oliveira & D. Dargent 《International journal of gynecological cancer》1997,7(5):368-375
Vergote IB, de Oliveira CF, Dargent D. How to organize gynecologic oncologyin the future: Results of an international questionnaire. Int J GynecolCancer 1997; 7: 368–375.
A questionnaire was sent to 93 gynecologic oncologists from 54 countriesabout the way in which gynecologic oncology was organized in their country, orif the (sub)speciality wasnot yet recognized, how they thought it should be organized. The questionnairewas answered by 64 persons from 42 different countries. The subspecialty wasrecognised in 17 (41%) of the countries. Fifty-five respondents (86%) thought thatgynecologic oncology should be a subspecialty of obstetrics and gynecology. Themedian duration of the gynecologiconcologic fellowship program was 30 months. Diagnosis and surgery accounted forabout 58% of the duration of the program. In 52% of the answersfrom countries with boardcertification, the fellows had to pass a theoretical and practical examination,and in addition 22% of the candidates had to defend a thesis to qualifyfor certification.Training centers in countries that recognized gynecologic oncology had amedian number of 142 new cases per year (for 1 fellow). The median number ofgynecologic oncologogistsand fellows per 10(7) inhabitants in countries with boardcertification in gynecologic oncology was 42 and 6, respectively. Finally, theimportant role of internationalsocieties (like the International Gynecologic Cancer Society and the EuropeanSociety of Gynaecological Oncology) in supporting the countries withoutrecognized GynecologicOncology was stressed by the respondents. The setting up of internationalstandards for training programs, training centers, board certification, and theorganization ofinternational exchange programs for fellows seemed to be equally important,according to the questionnaire responses. 相似文献
A questionnaire was sent to 93 gynecologic oncologists from 54 countriesabout the way in which gynecologic oncology was organized in their country, orif the (sub)speciality wasnot yet recognized, how they thought it should be organized. The questionnairewas answered by 64 persons from 42 different countries. The subspecialty wasrecognised in 17 (41%) of the countries. Fifty-five respondents (86%) thought thatgynecologic oncology should be a subspecialty of obstetrics and gynecology. Themedian duration of the gynecologiconcologic fellowship program was 30 months. Diagnosis and surgery accounted forabout 58% of the duration of the program. In 52% of the answersfrom countries with boardcertification, the fellows had to pass a theoretical and practical examination,and in addition 22% of the candidates had to defend a thesis to qualifyfor certification.Training centers in countries that recognized gynecologic oncology had amedian number of 142 new cases per year (for 1 fellow). The median number ofgynecologic oncologogistsand fellows per 10
85.
Kangaroo Care with a ventilated preterm infant 总被引:4,自引:0,他引:4
86.
By using the Golgi technique, the authors investigated the morphology of ganglion cells in the retinas of South American opossums. In flat-mount preparations of the retinas, cell bodies, entire dendritic fields, and the stratification level of ganglion cells were studied. Fractal dimensions of dendritic trees, an objective quantitative measure of morphological complexity, were included as a morphological parameter of classification. Based on these characteristics, nineteen types of ganglion cells were described. A great number of opossum ganglion cell types had dendrites stratifying in both sublaminae of the inner plexiform layer (IPL) in five different ways (S1-S3 [G9], S1-S4 [G17 and G22], S2/S3 [G19], S2-S4 [G15, G16, G21 and G221, and S2-S5 [G61), and only two types (G8, and G10) showed narrow field dendritic trees ramifying in S4 only. Morphological types of opossum ganglion cells were compared to their counterparts in cat retina. The distribution pattern of large cell bodies on the ganglion cell layer was analyzed employing the Nissl staining method, immunocytochemistry for neurofilaments, and the reduced silver neurofibrillar staining method. The results showed a random pattern of distribution. 相似文献
87.
88.
Anti-inflammatory effects of fructose-1,6-bisphosphate on carrageenan-induced pleurisy in rat. 总被引:3,自引:0,他引:3
José Carlos Farias Alves Filho Roberto Christ Vianna Santos Telmo Abelin Castaman Jarbas Rodrigues de Oliveira 《Pharmacological research》2004,49(3):245-248
In the present study, we evaluated the effect of fructose-1,6-bisphosphate (FBP), a high energy intermediate metabolite of glycolysis, in an acute model of lung injury. Injection of carrageenan into the pleural cavity of rats elicited an acute inflammation response characterized by a fluid accumulation in the pleural cavity which contained a large number of polymorphonuclear neutrophils. FBP (500mg/kg) attenuated the inflammation parameters: exudate volume, total leukocytes and the number of polymorphonuclear leukocytes, but the protein concentration in the exudate was not significantly affected by treatment with FBP. The precise site and mechanism of the anti-inflammatory effect was not addressed, considering the diverse pharmacological actions of FBP. This drug has anti-inflammatory actions suggesting that it may represent a novel strategy for the modulation of inflammatory response. 相似文献
89.
Andra Araujo Brando Weimar Kunz Sebba Barroso Audes Feitosa Eduardo Costa Duarte Barbosa Roberto Dischinger Miranda Priscila Valverde de Oliveira Vitorino Roberto Pozzan Lucio Paulo Ribeiro Abraham Epelman Giovanni Alves Saraiva Fabio Serra Silveira Antnio Almeida Braga Marco Mota Gomes 《Arquivos brasileiros de cardiologia》2022,119(2):353
90.
Patrícia Gon?alves Pinheiro Gilvandete Maria Pinheiro Santiago Francisco Erivaldo Freitas da Silva Ana Carolina Justino de Araújo Cícera Rejane Tavares de Oliveira Priscilla Ramos Freitas Janaína Esmeraldo Rocha JoséBezerra de Araújo Neto Maria Milene Costa da Silva Saulo Relison Tintino Irwin Rose Alencar de Menezes Henrique Douglas Melo Coutinho JoséGalberto Martins da Costa 《Asian Pacific Journal of Tropical Biomedicine》2021,(9):405-413
Objective: To evaluate the inhibitory activity of ferulic acid and four of its esterified derivatives (methyl, ethyl, propyl, and butyl) against resistance mech... 相似文献