全文获取类型
收费全文 | 6493篇 |
免费 | 368篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 57篇 |
儿科学 | 122篇 |
妇产科学 | 229篇 |
基础医学 | 1095篇 |
口腔科学 | 555篇 |
临床医学 | 491篇 |
内科学 | 1160篇 |
皮肤病学 | 148篇 |
神经病学 | 619篇 |
特种医学 | 187篇 |
外科学 | 983篇 |
综合类 | 42篇 |
一般理论 | 9篇 |
预防医学 | 441篇 |
眼科学 | 131篇 |
药学 | 345篇 |
中国医学 | 22篇 |
肿瘤学 | 247篇 |
出版年
2023年 | 50篇 |
2022年 | 108篇 |
2021年 | 183篇 |
2020年 | 119篇 |
2019年 | 161篇 |
2018年 | 204篇 |
2017年 | 140篇 |
2016年 | 196篇 |
2015年 | 184篇 |
2014年 | 251篇 |
2013年 | 344篇 |
2012年 | 439篇 |
2011年 | 491篇 |
2010年 | 275篇 |
2009年 | 255篇 |
2008年 | 414篇 |
2007年 | 411篇 |
2006年 | 321篇 |
2005年 | 273篇 |
2004年 | 301篇 |
2003年 | 245篇 |
2002年 | 211篇 |
2001年 | 166篇 |
2000年 | 152篇 |
1999年 | 109篇 |
1998年 | 35篇 |
1997年 | 18篇 |
1996年 | 35篇 |
1994年 | 23篇 |
1992年 | 54篇 |
1991年 | 42篇 |
1990年 | 43篇 |
1989年 | 28篇 |
1988年 | 47篇 |
1987年 | 31篇 |
1986年 | 39篇 |
1985年 | 40篇 |
1984年 | 21篇 |
1983年 | 29篇 |
1982年 | 20篇 |
1981年 | 20篇 |
1980年 | 17篇 |
1979年 | 23篇 |
1975年 | 22篇 |
1974年 | 18篇 |
1973年 | 16篇 |
1972年 | 18篇 |
1971年 | 22篇 |
1970年 | 30篇 |
1969年 | 18篇 |
排序方式: 共有6883条查询结果,搜索用时 15 毫秒
81.
82.
Gerson Moreira Damasceno Arthur Sá Ferreira Leandro Alberto Calazans Nogueira Felipe José Jandre Reis Rodrigo Wagner Lara Ney Meziat-Filho 《Journal of bodywork and movement therapies》2018,22(4):963-967
Background
There is a hypothesis that the growing use of mobile phones in an inappropriate posture to text and read (text neck) could be a reason for the increasing prevalence of neck pain in the past decade. Before testing if there is an association between text neck and neck pain, it is necessary to develop reliable pragmatic tools appropriate to epidemiological studies.Objectives
The primary aim of this study was to assess the reliability of the self-perception of text neck, as well as the reliability of physiotherapists’ classification of the text neck.Methods
The convenience sample was composed of 113 high school students between 18 and 21 years old from a cross-sectional study. As their self-perceived posture, participants had to choose in a questionnaire one of four neck postures of a person texting on a mobile phone. The physiotherapists classified lateral photographs taken with the participants texting on a mobile phone in their habitual posture as 1 (normal), 2 (acceptable), 3 (inappropriate), and 4 (excessively inappropriate).Results
The results showed that the test–retest reliability of the self-perception was substantial (kappa?=?0.73, 95% CI 0.54 to 0.86). The reliability of the physiotherapists’ responses, according to the photographic analysis considering the three raters, was moderate (kappa?=?0.5, 95% CI 0.39 to 0.61). Seventy-six percent of the participants with appropriate posture in the photographic analysis self-reported an inappropriate posture.Conclusion
This study showed that the self-perception of the neck posture during mobile phone texting is reliable over time and that the physiotherapists’ classification based on photographic analysis was acceptable for epidemiological studies. Participants had a tendency to report that the posture was worse than it actually was in the photographic analysis performed by the physiotherapists. 相似文献83.
Ney Meziat-Filho Maicom Lima Jessica Fernandez Felipe J.J. Reis 《Journal of bodywork and movement therapies》2018,22(1):32-36
This case report presents the effect of Cognitive Functional Therapy (CFT) in a patient with chronic non-specific neck pain. The patient believed that pain signified tissue damage, and demonstrated pain catastrophizing, hypervigilance, stress sensitivity, and movement impairment of the neck, during extension and rotation. The CFT intervention integrated a cognitive approach with manual therapy and active exercises to encourage the patient to trust her neck again. One month after the first appointment, the patient had recovered confidence, and the pain and disability had disappeared almost entirely. 相似文献
84.
Alon Unger Ridalva D. M. Felzemburgh Robert E. Snyder Guilherme S. Ribeiro Sharif Mohr Vinícius B. A. Costa Astrid X. T. O. Melendez Renato B. Reis Francisco S. Santana Lee W. Riley Mitermayer G. Reis Albert I. Ko Pau da Lima Urban Health Team 《Journal of urban health》2015,92(3):446-459
Low- and middle-income countries account for the majority of hypertension disease burden. However, little is known about the distribution of this illness within subpopulations of these countries, particularly among those who live in urban informal settlements. A cross-sectional hypertension survey was conducted in 2003 among 5649 adult residents of a slum settlement in the city of Salvador, Brazil. Hypertension was defined as either an elevated arterial systolic (≥140 mmHg) or diastolic (≥90 mmHg) blood pressure. Sex-specific multivariable models of systolic blood pressure were constructed to identify factors associated with elevated blood pressure. The prevalence of hypertension in the population 18 years and older was 21 % (1162/5649). Men had 1.2 times the risk of hypertension compared with women (95 % confidence intervals (CI), 1.05, 1.36). Increasing age and lack of any schooling, particularly for women, were also significantly associated with elevated blood pressure (p < 0.05). There was also a direct association between men who were black and an elevated blood pressure. Among those who were hypertensive, 65.5 % were aware of their condition, and only 36.3 % of those aware were actively using anti-hypertensive medications. Men were less likely to be aware of their diagnosis or to use medications (p < 0.01 for both) than women. The prevalence of hypertension in this slum community was lower than reported frequencies in the non-slum population of Brazil and Salvador, yet both disease awareness and treatment frequency were low. Further research on hypertension and other chronic non-communicable diseases in slum populations is urgently needed to guide prevention and treatment efforts in this growing population. 相似文献
85.
Rodolfo Gonzalez Camargo Daniela Mendes dos Reis Riccardi Henrique Quintas Teixeira Ribeiro Luiz Carlos Carnevali Jr. Emidio Marques de Matos-Neto Lucas Enjiu Rodrigo Xavier Neves Joanna Darck Carola Correia Lima Raquel Galv?o Figuerêdo Paulo Sérgio Martins de Alcantara Linda Maximiano José Otoch Miguel Luiz Batista Jr. Gerhard Püschel Marilia Seelaender 《Nutrients》2015,7(6):4465-4479
86.
Sympathetic nerves and adrenal medulla: contributions to cardiovascular-conditioned emotional responses in spontaneously hypertensive rats 总被引:1,自引:0,他引:1
This report investigates the contributions of the sympathetic nerves and adrenal medulla to resting mean arterial pressure (MAP) and to emotionally conditioned MAP and heart rate (HR) responses in unrestrained spontaneously hypertensive rats (SHR) and Wistar-Kyoto normotensive control rats (WKY). Resting MAP (in mm Hg), which was higher in SHR (WKY = 120 +/- 4; SHR = 163 +/- 4; p less than 0.01), did not differ in the two strains following chemosympathectomy (WKY = 105 +/- 2; SHR = 101 +/- 2; n.s.). Adrenal medullectomy did not affect resting MAP in WKY (125 +/- 6; n.s.) but lowered it in SHR (146 +/- 5; p less than 0.05), relative to controls (see above). The conditioned pressor response (in mm Hg) in controls consisted of two peaks (I, II) in both strains, but was exaggerated in SHR (I = WKY, 13 +/- 1; SHR, 25 +/- 2; p less than 0.01; II = WKY 10 +/- 2; SHR 20 +/- 2; p less than 0.01). Chemosympathectomy suppressed (relative to controls) the first peak, but not the second, in both strains (WKY: I = 4 +/- 1, p less than 0.01; II = 12 +/- 2, n.s.; SHR: I = 6 +/- 1, p less than 0.01; II = 15 +/- 2, n.s.). Adrenal medullectomy alone had little effect on the pressor response, but when combined with chemosympathectomy both peaks were largely eliminated (WKY: I = 2 +/- I; II = 5 +/- 1; SHR: I = 1 +/- 0; II = 2 +/- 0). These data indicate that: 1) hypertension in conscious, freely behaving SHR is largely sustained by the sympathetic vasomotor nerves but that the adrenal medulla contributes to the magnitude of the elevation; 2) the early component of the exaggerated pressor response during aversive stimulation is mediated by sympathetic vasomotor excitation; and 3) the later component of the exaggerated pressor response reflects coactivation of the sympathetic vasomotor nerves and the adrenal medulla. 相似文献
87.
A I Ko J N Reis S J Coppola E L Gouveia S M Cordeiro T S L?bo R M Pinheiro K Salgado C M Ribeiro Dourado J Tavares-Neto H Rocha M Galv?o Reis W D Johnson L W Riley 《Clinical infectious diseases》2000,30(1):78-86
Active hospital-based surveillance in the city of Salvador, Brazil, from December 1995 through October 1998, identified 221 patients with confirmed pneumococcal meningitis. Of these 221 patients, 29 (13%) had isolates with intermediate-level resistance to penicillin. Infection with these penicillin-nonsusceptible isolates was significantly associated with age of <2 years (P<.0019), previous antibiotic use (P<.0006), and coresistance to trimethoprim-sulfamethoxazole (P<.0000). Serotype 14 was the most prevalent serotype (55.2%) of penicillin-nonsusceptible isolates. Strain typing by repetitive element BOX polymerase chain reaction (PCR) analysis showed that penicillin-nonsusceptible serotype 14 isolates had closely related BOX PCR patterns, whereas penicillin-susceptible serotype 14 isolates each had distinct, unrelated patterns. Penicillin-nonsusceptible serotype 14 isolates from Salvador and other Brazilian cities had similar BOX PCR patterns. These observations indicate that in Brazil a large proportion of cases of penicillin-nonsusceptible pneumococcal meningitis appear to be caused by a closely related group of serotype 14 strains that may have disseminated to widely separate geographic areas. 相似文献
88.
Corrêa Hugo Luca Gadelha André Bonadias Dutra Maurílio Tiradentes Neves Rodrigo Vanerson Passos de Deus Lysleine Alves Moura Sting Ray Gouvêa Silva Victor Lopes Reis Andrea Lucena Honorato Fernando Souza de Araújo Thaís Branquinho de Barros Carolina Fonseca Moraes Milton Rocha Ferreira Carlos Ernesto Santos Prestes Jonato Rosa Thiago Santos 《Sport Sciences for Health》2022,18(2):357-365
Sport Sciences for Health - To investigate the hemodynamic responses, especially HPE following different resistance exercises RE protocols in young adult subjects. Eighty-nine men... 相似文献
89.
Predictors and consequences of aggressive behavior by community-based dementia patients 总被引:1,自引:0,他引:1
The frequency, nature, context, and caregivers' reactions to aggressive behavior in 213 dementia patients residing in the community was studied. Aggression was reported in 57.2% of the patients and in 10.6% of the caregivers. Predictors of patient aggression were greater frequency of behavior and memory problems, premorbid aggression, and a more troubled premorbid social relationship between patient and caregiver. Patient aggression predicted the decision to discontinue home care. 相似文献
90.