全文获取类型
收费全文 | 1982篇 |
免费 | 124篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 56篇 |
妇产科学 | 56篇 |
基础医学 | 247篇 |
口腔科学 | 109篇 |
临床医学 | 175篇 |
内科学 | 493篇 |
皮肤病学 | 19篇 |
神经病学 | 205篇 |
特种医学 | 43篇 |
外科学 | 243篇 |
综合类 | 19篇 |
一般理论 | 3篇 |
预防医学 | 151篇 |
眼科学 | 56篇 |
药学 | 102篇 |
中国医学 | 19篇 |
肿瘤学 | 111篇 |
出版年
2023年 | 10篇 |
2022年 | 39篇 |
2021年 | 81篇 |
2020年 | 48篇 |
2019年 | 53篇 |
2018年 | 66篇 |
2017年 | 40篇 |
2016年 | 58篇 |
2015年 | 44篇 |
2014年 | 66篇 |
2013年 | 104篇 |
2012年 | 147篇 |
2011年 | 137篇 |
2010年 | 84篇 |
2009年 | 80篇 |
2008年 | 143篇 |
2007年 | 114篇 |
2006年 | 102篇 |
2005年 | 108篇 |
2004年 | 74篇 |
2003年 | 85篇 |
2002年 | 69篇 |
2001年 | 34篇 |
2000年 | 39篇 |
1999年 | 30篇 |
1998年 | 16篇 |
1997年 | 22篇 |
1996年 | 12篇 |
1995年 | 12篇 |
1994年 | 15篇 |
1993年 | 7篇 |
1992年 | 25篇 |
1991年 | 23篇 |
1990年 | 14篇 |
1989年 | 9篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 14篇 |
1985年 | 10篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1973年 | 3篇 |
1970年 | 3篇 |
1969年 | 4篇 |
排序方式: 共有2118条查询结果,搜索用时 31 毫秒
31.
32.
Osteonecrosis of the jaw in cancer after treatment with bisphosphonates: incidence and risk factors. 总被引:23,自引:0,他引:23
Aristotle Bamias Efstathios Kastritis Christina Bamia Lia A Moulopoulos Ioannis Melakopoulos George Bozas Vassiliki Koutsoukou Dimitra Gika Athanasios Anagnostopoulos Christos Papadimitriou Evagelos Terpos Meletios A Dimopoulos 《Journal of clinical oncology》2005,23(34):8580-8587
PURPOSE: Osteonecrosis of the jaw (ONJ) has been associated recently with the use of pamidronate and zoledronic acid. We studied the incidence, characteristics, and risk factors for the development of ONJ among patients treated with bisphosphonates for bone metastases. PATIENTS AND METHODS: ONJ was assessed prospectively since July 2003. The first bisphosphonate treatment among patients with ONJ was administered in 1997. Two hundred fifty-two patients who received bisphosphonates since January 1997 were included in this analysis. RESULTS: Seventeen patients (6.7%) developed ONJ: 11 of 111 (9.9%) with multiple myeloma, two of 70 (2.9%) with breast cancer, three of 46 (6.5%) with prostate cancer, and one of 25 (4%) with other neoplasms (P = .289). The median number of treatment cycles and time of exposure to bisphosphonates were 35 infusions and 39.3 months for patients with ONJ compared with 15 infusions (P < .001) and 19 months (P = .001), respectively, for patients with no ONJ. The incidence of ONJ increased with time to exposure from 1.5% among patients treated for 4 to 12 months to 7.7% for treatment of 37 to 48 months. The cumulative hazard was significantly higher with zoledronic acid compared with pamidronate alone or pamidronate and zoledronic acid sequentially (P < .001). All but two patients with ONJ had a history of dental procedures within the last year or use of dentures. CONCLUSION: The use of bisphosphonates seems to be associated with the development of ONJ. Length of exposure seems to be the most important risk factor for this complication. The type of bisphosphonate may play a role and previous dental procedures may be a precipitating factor. 相似文献
33.
Hua Qin Brendan T Keenan Diego R Mazzotti Fernando Vaquerizo-Villar Jan F Kraemer Niels Wessel Sergio Tufik Lia Bittencourt Peter A Cistulli Philip de Chazal Kate Sutherland Bhajan Singh Allan I Pack Ning-Hung Chen Ingo Fietze Thorarinn Gislason Steven Holfinger Ulysses J Magalang Thomas Penzel 《Sleep》2021,44(5)
Study ObjectivesPatients with obstructive sleep apnea (OSA) exhibit heterogeneous heart rate variability (HRV) during wakefulness and sleep. We investigated the influence of OSA severity on HRV parameters during wakefulness in a large international clinical sample.Methods1247 subjects (426 without OSA and 821 patients with OSA) were enrolled from the Sleep Apnea Global Interdisciplinary Consortium. HRV parameters were calculated during a 5-minute wakefulness period with spontaneous breathing prior to the sleep study, using time-domain, frequency-domain and nonlinear methods. Differences in HRV were evaluated among groups using analysis of covariance, controlling for relevant covariates.ResultsPatients with OSA showed significantly lower time-domain variations and less complexity of heartbeats compared to individuals without OSA. Those with severe OSA had remarkably reduced HRV compared to all other groups. Compared to non-OSA patients, those with severe OSA had lower HRV based on SDNN (adjusted mean: 37.4 vs. 46.2 ms; p < 0.0001), RMSSD (21.5 vs. 27.9 ms; p < 0.0001), ShanEn (1.83 vs. 2.01; p < 0.0001), and Forbword (36.7 vs. 33.0; p = 0.0001). While no differences were found in frequency-domain measures overall, among obese patients there was a shift to sympathetic dominance in severe OSA, with a higher LF/HF ratio compared to obese non-OSA patients (4.2 vs. 2.7; p = 0.009).ConclusionsTime-domain and nonlinear HRV measures during wakefulness are associated with OSA severity, with severe patients having remarkably reduced and less complex HRV. Frequency-domain measures show a shift to sympathetic dominance only in obese OSA patients. Thus, HRV during wakefulness could provide additional information about cardiovascular physiology in OSA patients.Clinical Trial Information: A Prospective Observational Cohort to Study the Genetics of Obstructive Sleep Apnea and Associated Co-Morbidities (German Clinical Trials Register - DKRS, DRKS00003966) https://www.drks.de/drks_web/navigate.do?navigationId=trial.HTML&TRIAL_ID=DRKS00003966 相似文献
34.
Sara Bulgheroni Stefano D'Arrigo Sabrina Signorini Marilena Briguglio Maria Lucia Di Sabato Manuela Casarano Francesca Mancini Marta Romani Paolo Alfieri Roberta Battini Marina Zoppello Gaetano Tortorella Enrico Bertini Vincenzo Leuzzi Enza Maria Valente Daria Riva 《American journal of medical genetics. Part A》2016,170(12):3115-3124
35.
36.
37.
Fernanda Herrera Costa DDS MSc Victor Costa DDS MSc Jorge Esquiche León DDS PhD Ana Lia Anbinder DDS PhD Alfredo Ribeiro-Silva MD PhD Estela Kaminagakura DDS PhD 《Pediatric dermatology》2020,37(4):721-723
We report a case of atypical oral hairy leukoplakia (OHL) in a 9-year-old immunocompetent girl treated with fluticasone propionate nasal spray for allergic rhinitis. The OHL in childhood is uncommon and should be included in a differential diagnosis of white lesions in the oral mucosa. 相似文献
38.
Igor Mokrousov Olga Narvskaya Anna Vyazovaya Tatiana Otten Wei-Wei Jiao Lia Lima Gomes Philip N. Suffys A-Dong Shen Boris Vishnevsky 《Journal of clinical microbiology》2012,50(11):3757-3759
We describe a multiplex PCR assay to detect the Mycobacterium tuberculosis Beijing genotype variant B0/W148, which is considered a “successful” clone of M. tuberculosis, widespread in Russia. Specificity and sensitivity of the assay were 100% based on the analysis of a collection of 516 M. tuberculosis isolates of different genotypes and origins. This assay may be used for accurate and simple detection and surveillance of this clinically and epidemiologically important variant of M. tuberculosis. 相似文献
39.
Many data coming from animal models and clinical observations support an involvement of intestinal microbiota in the pathogenesis of Crohn’s disease(CD). It is hypothesized in fact,that the development of chronic intestinal inflammation is caused by an abnormal immune response to normal flora in genetically susceptible hosts.The involvement of bacteria in CD inflammation has provided the rationale for including antibiotics in the therapeutic armamentarium.However, randomized controlled trials have failed to demonstrate an efficacy of these drugs in patients with active uncomplicated CD,even if a subgroup of patients with colonic location seems to get benefit from antibiotics. Nitroimidazole compounds have been shown to be efficacious in decreasing CD recurrence rates in operated patients,and the use of metronidazole and ciprofloxacin is recommended in perianal disease.However,the appearance of systemic side effects limits antibiotic long-term employment necessary for treating a chronic relapsing disease.Rifaximin,characterized by an excellent safety profile,has provided promising results in inducing remission of CD. 相似文献
40.
Evidence of mild hypertension in women and female rats and our preliminary observation showing that training is not effective to reduce pressure in female as it does in male spontaneously hypertensive rats (SHR) prompt us to investigate the effects of gender on hemodynamic pattern and microcirculatory changes induced by exercise training. Female SHR and normotensive controls (Wistar-Kyoto rats) were submitted to training (55% VO(2) peak; 3 months) or kept sedentary and instrumented for pressure and hindlimb flow measurements at rest and during exercise. Heart, kidney, and skeletal muscles (locomotor/nonlocomotor) were processed for morphometric analysis of arterioles, capillaries, and venules. High pressure in female SHR was accompanied by an increased arteriolar wall:lumen ratio in the kidney (+30%; P<0.01) but an unchanged ratio in the skeletal muscles and myocardium. Female SHR submitted to training did not exhibit further changes on the arteriolar wall:lumen ratio and pressure, showing additionally increased hindlimb resistance at rest (+29%; P<0.05). On the other hand, female SHR submitted to training exhibited increased capillary and venular densities in locomotor muscles (+50% and 2.3-fold versus sedentary SHR, respectively) and normalized hindlimb flow during exercise hyperemia. Left ventricle pressure and weight were higher in SHR versus WKY rats, but heart performance (positive dP/dt(max) and negative dP/dt(max)) was not changed by hypertension or training, suggesting a compensated heart function in female SHR. In conclusion, the absence of training-induced structural changes on skeletal muscle and myocardium arterioles differed from changes observed previously in male SHR, suggesting a gender effect. This effect might contribute to the lack of pressure fall in trained female SHRs. 相似文献