全文获取类型
收费全文 | 8217篇 |
免费 | 649篇 |
国内免费 | 43篇 |
专业分类
耳鼻咽喉 | 36篇 |
儿科学 | 196篇 |
妇产科学 | 133篇 |
基础医学 | 903篇 |
口腔科学 | 200篇 |
临床医学 | 783篇 |
内科学 | 2112篇 |
皮肤病学 | 190篇 |
神经病学 | 792篇 |
特种医学 | 418篇 |
外科学 | 1084篇 |
综合类 | 254篇 |
一般理论 | 28篇 |
预防医学 | 671篇 |
眼科学 | 277篇 |
药学 | 483篇 |
1篇 | |
中国医学 | 20篇 |
肿瘤学 | 328篇 |
出版年
2023年 | 58篇 |
2022年 | 61篇 |
2021年 | 131篇 |
2020年 | 94篇 |
2019年 | 153篇 |
2018年 | 179篇 |
2017年 | 148篇 |
2016年 | 123篇 |
2015年 | 135篇 |
2014年 | 175篇 |
2013年 | 293篇 |
2012年 | 379篇 |
2011年 | 428篇 |
2010年 | 266篇 |
2009年 | 224篇 |
2008年 | 386篇 |
2007年 | 400篇 |
2006年 | 413篇 |
2005年 | 363篇 |
2004年 | 306篇 |
2003年 | 337篇 |
2002年 | 256篇 |
2001年 | 187篇 |
2000年 | 192篇 |
1999年 | 186篇 |
1998年 | 110篇 |
1997年 | 95篇 |
1996年 | 94篇 |
1995年 | 92篇 |
1994年 | 84篇 |
1993年 | 69篇 |
1992年 | 169篇 |
1991年 | 143篇 |
1990年 | 132篇 |
1989年 | 153篇 |
1988年 | 148篇 |
1987年 | 153篇 |
1986年 | 149篇 |
1985年 | 133篇 |
1984年 | 108篇 |
1983年 | 68篇 |
1982年 | 63篇 |
1979年 | 92篇 |
1978年 | 83篇 |
1977年 | 67篇 |
1976年 | 58篇 |
1974年 | 69篇 |
1973年 | 61篇 |
1972年 | 62篇 |
1971年 | 59篇 |
排序方式: 共有8909条查询结果,搜索用时 15 毫秒
1.
Fabian M. Laage Gaupp Nadia Solomon Ivan Rukundo Azza A. Naif Erick M. Mbuguje Anish Gonchigar Minzhi Xing John D. Prologo Douglas D. Silin Frank J. Minja 《Journal of vascular and interventional radiology : JVIR》2019,30(12):2036-2040
Despite a population of nearly 60 million, there is currently not a single interventional radiologist in Tanzania. Based on an Interventional Radiology (IR) Readiness Assessment, the key obstacles to establishing IR in Tanzania are the lack of training opportunities and limited availability of disposable equipment. An IR training program was designed and initiated, which relies on US-based volunteer teams of IR physicians, nurses, and technologists to locally train radiology residents, nurses, and technologists. Preliminary results support this strategy for addressing the lack of training opportunities and provide a model for introducing IR to other resource-limited settings. 相似文献
2.
Seymour Solomon Brian M Grosberg Deborah I Friedman Richard B Lipton 《Journal of neuro-ophthalmology》2007,27(3):243-4; author reply 244-5
3.
Various cases are presented demonstrating the role of computed tomography (CT) in the assessment of serosal and bowel wall pathology. Reference is made to the morphology of the lesions. Illustrative examples of tumors, secondary malignant dissemination, irradiation injury to the gut, and intramural gas associated with ulcerative colitis, are all illustrated. 相似文献
4.
It was hypothesized that members of an older cohort of seriously mentally ill community mental health clients would develop stronger alliances with intensive case managers. Eighty-six clients participating in a study of case management services completed a measure of working alliance and structured interviews. It was found that older cohort clients, those age 45 or older, showed much stronger alliances with their case managers than younger clients.This research is funded by NIMH/SAMHSA grant R18MH46082. 相似文献
5.
Dr. Caroline S. Zeind Pharm.D. Dr. Kerry O. Cleveland M.D. Dr. Madhavi Menon M.D. Dr. James R. Brown Pharm.D. Dr. David K. Solomon Pharm.D. 《Pharmacotherapy》1996,16(4):547-561
The optimum therapy for cryptococcal meningitis in patients with the acquired immunodeficiency syndrome (AIDS) remains unresolved. Traditional therapy consists of amphotericin B with or without flucytosine. Obstacles exist in administering these agents to patients with AIDS. Mortality rates during initial therapy are relatively high. Given the lack of proved benefit, we do not recommend adding flucytosine to amphotericin B routinely. The search for more efficacious and less toxic agents continues. The oral triazoles, especially fluconazole, have increased the options for treatment of this disease. New strategies and novel approaches in managing cryptococcal meningitis in patients with AIDS continue to be developed. 相似文献
6.
W L Young I Prohovnik E Ornstein N Ostapkovich M B Sisti R A Solomon B M Stein 《Neurosurgery》1990,27(2):257-66; discussion 266-7
To investigate the cerebral hemodynamic changes associated with obliteration of arteriovenous malformations (AVMs), we studied 26 patients undergoing total microsurgical AVM resection during isoflurane and N2/O2 anesthesia. Detectors were placed 5 to 6 cm from the margin of the lesion and in a homologous contralateral position. Cerebral blood flow (CBF) was measured using the intravenous xenon-133 technique before and after AVM resection, during both hypocapnia and normocapnia at each stage. Intraoperative changes in CBF were related to a risk score system based on the patient's history and preoperative angiograms. Seven otherwise healthy patients undergoing spinal surgery were studied to control for anesthetic effects. Patient demographic and clinical data for the AVM group conformed to the expected strata of a large AVM population. The CBF increased after excision (22 +/- 1 ml/100 g/min before excision to 30 +/- 2 ml/100 g/min after excision; mean +/- SE, n = 25, P less than 0.002) without a hemispheric difference. CO2 reactivity increased slightly after excision (4.2 +/- 0.3% change/mm Hg before excision to 4.7 +/- 0.3% change/mm Hg after excision; n = 14, P less than 0.02). The baseline CBF and CO2 reactivity were not different from the control group. There was a weak correlation between the risk score and the percentage of change in the ipsilateral CBF, with a trend for the patients with the lowest risk to have the lowest CBF changes after resection. There was no relationship between CO2 reactivity and risk grade. None of the patients awoke from anesthesia with unexpected neurological deficits. The highest CBF increases were associated with postoperative brain swelling in one patient and fatal intracerebral hemorrhage in another. Both patients had normal CO2 reactivity before excision. One patient suffered postoperative intracerebral hemorrhage, attributable to technical problems, and had no increase in CBF. We conclude that, with an acute increase in the arteriovenous pressure gradient (and cerebral perfusion pressure) that results from shunt obliteration, there is an immediate global effect of AVM resection to increase CBF. Cerebrovascular reactivity to CO2 remains intact both before and after excision. 相似文献
7.
8.
S Gunasti† SS Marakli† I Tuncer‡ N Ozpoyraz§ VL Aksungur† 《Journal of the European Academy of Dermatology and Venereology》2007,21(6):811-817
BACKGROUND: We have seen several patients with itchy lichenified plaques located bilaterally on the elbows and/or knees and have named this condition 'psoriatic neurodermatitis' (PN). OBJECTIVE: The purpose of this study was to compare clinical and histopathological characteristics of these patients to those of patients with typical lichen simplex chronicus (LSC). METHODS: Nineteen patients with PN and 34 patients with typical LSC were included. Besides clinical dermatological evaluation, the prick test was carried out on 49 patients; the Phadiatop test on 40 patients; the patch test with European standard series on 47 patients; histopathological evaluation on 39 patients; and clinical psychiatric examination on 38 patients. RESULTS: Almost exclusively, PN was seen in females and was located on the extremities. It caused more plaques than typical LSC did. In PN, the plaques were smaller, sharper, more keratotic and less excoriated, and had fewer lichenoid papules around them. Itching was usually more severe in the evening, while resting and in a hot environment in typical LSC, but not in PN. In plaques of PN, microabscesses in the horny layer, hypogranulosis, regular acanthosis and thinning of the suprapapillary plates were more frequent, and hyperpigmentation in the basal layer was less. In patients with PN, depressive disorder was found more frequently; and generalized anxiety disorder or psychosomatic characteristics, less. There were no significant differences in the results of prick, Phadiatop and patch tests between patients with PN and those with typical LSC. CONCLUSION: In our opinion, it is most likely that the so-called PN is itchy psoriasis superimposed by LSC. 相似文献
9.
10.
Laura J. Solomon Ph.D. Ruth M. Mickey Ph.D. C.J. Rairikar M.A. John K. Worden Ph.D. Brian S. Flynn Sc.D. 《Preventive medicine》1998,27(6):781-786
Background.This study prospectively examined rates of adherence to mammography, clinical breast examination (CBE), and breast self-examination (BSE) in a cohort of women over 3 years to determine whether participation in BSE influenced participation in the other two screening modalities.Methods.Women ages 51 and older (n= 450) who attended a small group educational session to learn BSE and to hear about CBE and mammography guidelines were assessed annually by telephone for 3 consecutive years to determine their subsequent breast cancer screening behavior.Results.Annual CBE and mammography screening are highly positively associated. Regular performance of BSE has a modest positive association with both CBE and mammography adherence over time.Conclusions.Women who perform BSE regularly over time may be more likely to adhere to the other breast cancer screening guidelines. 相似文献