全文获取类型
收费全文 | 4695篇 |
免费 | 354篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 30篇 |
儿科学 | 162篇 |
妇产科学 | 111篇 |
基础医学 | 442篇 |
口腔科学 | 106篇 |
临床医学 | 654篇 |
内科学 | 952篇 |
皮肤病学 | 32篇 |
神经病学 | 406篇 |
特种医学 | 397篇 |
外国民族医学 | 1篇 |
外科学 | 543篇 |
综合类 | 119篇 |
预防医学 | 330篇 |
眼科学 | 81篇 |
药学 | 354篇 |
中国医学 | 9篇 |
肿瘤学 | 327篇 |
出版年
2022年 | 33篇 |
2021年 | 89篇 |
2020年 | 44篇 |
2019年 | 75篇 |
2018年 | 92篇 |
2017年 | 73篇 |
2016年 | 55篇 |
2015年 | 85篇 |
2014年 | 121篇 |
2013年 | 165篇 |
2012年 | 227篇 |
2011年 | 245篇 |
2010年 | 133篇 |
2009年 | 119篇 |
2008年 | 183篇 |
2007年 | 226篇 |
2006年 | 230篇 |
2005年 | 176篇 |
2004年 | 202篇 |
2003年 | 182篇 |
2002年 | 179篇 |
2001年 | 164篇 |
2000年 | 152篇 |
1999年 | 110篇 |
1998年 | 49篇 |
1997年 | 39篇 |
1996年 | 54篇 |
1995年 | 46篇 |
1994年 | 50篇 |
1993年 | 32篇 |
1992年 | 101篇 |
1991年 | 105篇 |
1990年 | 110篇 |
1989年 | 100篇 |
1988年 | 86篇 |
1987年 | 76篇 |
1986年 | 97篇 |
1985年 | 89篇 |
1984年 | 65篇 |
1983年 | 51篇 |
1982年 | 40篇 |
1981年 | 30篇 |
1980年 | 31篇 |
1979年 | 50篇 |
1978年 | 41篇 |
1977年 | 29篇 |
1976年 | 40篇 |
1975年 | 30篇 |
1974年 | 29篇 |
1972年 | 28篇 |
排序方式: 共有5056条查询结果,搜索用时 0 毫秒
81.
Morgan R. Bobb Azeemuddin Ahmed MD MBA Paul Van Heukelom MD Rachel Tranter MPAS PA‐C Karisa K. Harland PhD MPH Brady M. Firth PhD MA Randy Fry MBA Katherine Schneider MSN RN CEN Kathryn K. Dierks DO Sarah L. Miller MD Nicholas M. Mohr MD MS 《Academic emergency medicine》2018,25(7):795-803
Objective
The objective of this study was to determine specific provider practices associated with high provider efficiency in community emergency departments (EDs).Methods
A mixed‐methods study design was utilized to identify key behaviors associated with efficiency. Stage 1 was a convenience sample of 16 participants (ED medical directors, nurses, advanced practice providers, and physicians) identified provider efficiency behaviors during semistructured interviews. Ninety‐nine behaviors were identified and distilled by a group of three ED clinicians into 18 themes. Stage 2 was an observational study of 35 providers was performed in four (30,000‐ to 55,000‐visit) community EDs during two 4‐hour periods and recorded in minute‐by‐minute observation logs. In Stage 3, each behavior or practice from Stage 1 was assigned a score within each observation period. Behaviors were tested for association with provider efficiency (relative value units/hour) using linear univariate generalized estimating equations with an identity link, clustered on ED site.Results
Five ED provider practices were found to be positively associated with efficiency: average patient load, using name of team member, conversations with health care team, visits to patient rooms, and running the board. Two behaviors, “inefficiency practices,” demonstrated significant negative correlations: non–work‐related tasks and documentation on patients no longer in the ED.Conclusions
Average patient load, running the board, conversations with team member, and using names of team members are associated with enhanced provider productivity. Identification of behaviors associated with efficiency can be utilized by medical directors, clinicians, and trainees to improve personal efficiency or counsel team members.82.
Caselli A Hanane T Jane B Carter S Khaodhiar L Veves A 《Journal of diabetes and its complications》2003,17(4):205-210
OBJECTIVE: To evaluate the vasodilation induced by topical application of methyl nicotinate (MN) and to compare it with the vasodilatory response to acetylcholine (ACh) and sodium nitroprusside (SNP) in healthy subjects and diabetic neuropathic patients. RESEARCH DESIGN AND METHODS: Ten diabetic patients with peripheral neuropathy (DN) and 10 age- and sex-matched healthy control subjects (C) were enrolled. The vasodilatory response to topical application of 1% MN and a placebo emulsion at the forearm and dorsum of the foot skin at 5, 15, 30, 60 and 120 min was measured using Laser Doppler Perfusion Imaging. The vasodilatory response to iontophoresis of 1% ACh and 1% SNP solutions was also evaluated. RESULTS: The maximal vasodilatory response to ACh, SNP and MN was similar at the forearm and foot level in the diabetic patients. In the control group, the responses to MN, ACh and SNP were similar on the forearm but in the foot, the MN vasodilatory response was higher when compared to the ACh and SNP responses. MN-related vasodilation was present 5 min after the application, reached its peak at 15-30 min and declined to pre-application levels 120 min afterward. CONCLUSIONS: Topical application of MN at the forearm and foot levels of diabetic neuropathic patients results in skin vasodilation that is comparable to the maximal vasodilation that can be induced by iontophoresis of ACh or SNP and lasts for less than 2 h. Further studies will be required to explore the potential of MN to increase blood flow and to prevent diabetic foot problems in clinical practice. 相似文献
83.
Chronic airflow obstruction in Fabry's disease 总被引:4,自引:0,他引:4
D M Rosenberg V J Ferrans J D Fulmer B R Line J A Barranger R O Brady R G Crystal 《The American journal of medicine》1980,68(6):898-905
Seven patients with Fabry's disease, an x-linked sphingolipid storage disorder, were evaluated for the presence and extent of airway obstruction. All were found to have significant obstruction to airflow. In addition, evaluation of their airway epithelial cells obtained by bronchoscopy demonstrated that these cells contained inclusion bodies consistent with deposits of ceramide trihexoside, suggesting that part of their functional obstruction to airflow may be secondary to intrinsic airway disease. Although all of the study population had evidence of airflow obstruction, the impairment was much worse in those who smoked, implying that even mild cigarette smoking is particularly hazardous to patients with Fabry's disease. 相似文献
84.
Cardiovascular Effects of the Supraglottic and Super-supraglottic Swallowing Maneuvers in Stroke Patients with Dysphagia 总被引:2,自引:0,他引:2
The prolonged voluntary closure of the glottis during the supraglottic and super-supraglottic swallowing techniques may create
the Valsalva maneuver. The Valsalva maneuver has been associated with sudden cardiac death and cardiac arrhythmias. This study
describes the effects of the supraglottic and super-supraglottic swallowing techniques on the cardiovascular system. Subjects
included 23 patients from an acute inpatient rehabilitation hospital. Subject groups included recent stroke, dysphagia, and
a history of coronary artery disease (Group 1, N = 11), recent stroke and dysphagia with no known coronary artery disease
(Group 2, N = 4), and orthopedic diagnosis with no known dysphagia or coronary artery disease (Group 3, N = 8). Cardiac status
was moni-tored for 4 hours during swallowing training, regular therapy sessions, and a meal. For Groups 1 and 2, 86.6% (13
out of 15) of the subjects demonstrated abnormal cardiac findings during the swallowing session including supraventricular
tachycardia, premature atrial contractions, and premature ventricular contractions. Arrhythmia subsided within a few minutes
after the session and did not occur during other activities. In Group 3 (control group), none of the subjects demonstrated
abnormal cardiac findings except for bradycardia in one subject. It is suggested that the supraglottic and super-supraglottic
swallow maneuvers may be contraindicated for patients with a history of stroke or coronary artery disease. 相似文献
85.
M R Goldman T J Brady I L Pykett C T Burt F S Buonanno J P Kistler J H Newhouse W S Hinshaw G M Pohost 《Circulation》1982,66(5):1012-1016
Determination of myocardial infarct size is important for clinical management of patients with ischemic heart disease and for research on limiting infarct size. Nuclear magnetic resonance (NMR) imaging permits tomographic depiction of the distribution of mobile tissue protons. NMR images have demonstrated high spatial resolution and contrast. To evaluate the potential of this technique in measuring myocardial infarct size, NMR imaging was performed in six canine hearts excised 24 hours after circumflex coronary artery ligation. Before sacrifice, the dogs received i.v. manganous chloride (0.05 mmol/kg). After NMR imaging, the heart were sectioned and the myocardial slices were stained with triphenyl tetrazolium chloride. The pathologically determined infarct size was compared with the infarct size measured by NMR imaging. The correlation was good (regression line slope 1.06; r = 0.94). We conclude that NMR imaging with paramagnetic contrast agents can be used to determine infarct size in excised hearts. 相似文献
86.
Correction in trans for Fabry disease: expression, secretion and uptake of alpha-galactosidase A in patient-derived cells driven by a high-titer recombinant retroviral vector. 下载免费PDF全文
J A Medin M Tudor R Simovitch J M Quirk S Jacobson G J Murray R O Brady 《Proceedings of the National Academy of Sciences of the United States of America》1996,93(15):7917-7922
Fabry disease is an X-linked metabolic disorder due to a deficiency of alpha-galactosidase A (alpha-gal A; EC 3.2.1.22). Patients accumulate glycosphingolipids with terminal alpha-galactosyl residues that come from intracellular synthesis, circulating metabolites, or from the biodegradation Of senescent cells. Patients eventually succumb to renal, cardio-, or cerebrovascular disease. No specific therapy exists. One possible approach to ameliorating this disorder is to target corrective gene transfer therapy to circulating hematopoietic cells. Toward this end, an amphotropic virus-producer cell line has been developed that produces a high titer (>10(6) i.p. per ml) recombinant retrovirus constructed to transduce and correct target cells. Virus-producer cells also demonstrate expression of large amounts of both intracellular and secreted alpha-gal A. To examine the utility of this therapeutic vector, skin fibroblasts from Fabry patients were corrected for the metabolic defect by infection with this recombinant virus and secreted enzyme was observed. Furthermore, the secreted enzyme was found to be taken up by uncorrected cells in a mannose-6-phosphate receptor-dependent manner. In related experiments, immortalized B cell lines from Fabry patients, created as a hematologic delivery test system, were transduced. As with the fibroblasts, transduced patient B cell lines demonstrated both endogenous enzyme correction and a small amount of secretion together with uptake by uncorrected cells. These studies demonstrate that endogenous metabolic correction in transduced cells, combined with secretion, may provide a continuous source of corrective material in trans to unmodified patient bystander cells (metabolic cooperativity). 相似文献
87.
88.
89.
Biochemical and metabolic basis of familial sphingolipidoses 总被引:1,自引:0,他引:1
R O Brady 《Seminars in hematology》1972,9(3):273-284
90.
Brian D. Adkins Theresa A. Libby Marlene M. Mayberry Thomas W. Brady Justin B. Halls Stephanie Mallow Corbett Joseph Schoeny Eric P. Shields Jahan Chowdhury Amanda N. Kinsinger-Stickel Gay Wehrli Nicholas R. Jaeger Matthew P. Robertson Kathy M. Butler Stuart M. Lowson James Forrest Calland James D. Gorham 《Transfusion》2021,61(11):3066-3074