全文获取类型
收费全文 | 431篇 |
免费 | 39篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 25篇 |
妇产科学 | 3篇 |
基础医学 | 49篇 |
口腔科学 | 23篇 |
临床医学 | 60篇 |
内科学 | 72篇 |
皮肤病学 | 8篇 |
神经病学 | 27篇 |
特种医学 | 95篇 |
外科学 | 39篇 |
综合类 | 6篇 |
预防医学 | 31篇 |
眼科学 | 4篇 |
药学 | 13篇 |
2篇 | |
肿瘤学 | 18篇 |
出版年
2023年 | 4篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 11篇 |
2017年 | 7篇 |
2016年 | 9篇 |
2015年 | 13篇 |
2014年 | 12篇 |
2013年 | 18篇 |
2012年 | 19篇 |
2011年 | 8篇 |
2010年 | 16篇 |
2009年 | 25篇 |
2008年 | 15篇 |
2007年 | 15篇 |
2006年 | 14篇 |
2005年 | 13篇 |
2004年 | 12篇 |
2003年 | 6篇 |
2002年 | 9篇 |
2001年 | 13篇 |
2000年 | 3篇 |
1999年 | 13篇 |
1998年 | 19篇 |
1997年 | 20篇 |
1996年 | 17篇 |
1995年 | 21篇 |
1994年 | 15篇 |
1993年 | 10篇 |
1992年 | 3篇 |
1991年 | 6篇 |
1990年 | 8篇 |
1989年 | 10篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 9篇 |
1982年 | 3篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1977年 | 7篇 |
1976年 | 8篇 |
1975年 | 5篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1958年 | 2篇 |
排序方式: 共有476条查询结果,搜索用时 15 毫秒
81.
目的 探讨MSCT对食管鱼刺异物的检出率及临床诊断价值.方法 实验组:取3种鱼的鱼刺各30根,分为大、中、小鱼刺3组,3组鱼刺长度分别为(23.36±0.15)、(28.51±0.07)和(30.89±0.10)mm,直径分别为(4.4.9±0.31)、(1.78±0.09)和(0.49±0.07)mm.将鱼刺按照与食管长轴平行、垂直、斜行方式插入食管模型中,MSCT检查采用轴面扫描结合三维重组技术,观察MSCT和X线平片(CR和DR)对鱼刺的显示情况.临床组:回顾性分析20例经内镜或临床手术证实的食管鱼刺异物患者的资料,所有患者均行MSCT平扫,其中11例行X线平片(CR和DR)检查,15例行食管吞钡棉絮检查,17例行内镜检查,观察几种检查方法对鱼刺的显示情况.对不同方法对鱼刺显示情况的比较采用配对卡方检验.结果 实验组:MSCT检出鱼刺90根(100%),X线平片(CR和DR)检出鱼刺60根(66.7%),MSCT对鱼刺的检出率高于X线平片(CR和DR)(X2=28.03,P<0.01).临床组:20例中,MSCT检出鱼刺20例,且清楚显示鱼刺的位置、大小及其与食管壁和邻近组织的关系;X线平片检出鱼刺2例,食管吞钡棉絮检出鱼刺9例,内镜检出鱼刺14例.MSCT对食管鱼刺异物检出率高于X线平片(cR和DR)检查(X2=7.11,P<0.05)及食管吞钡棉絮检查(X2=4.17,P<01 05),与内镜检查差异无统计学意义(X2=1.33,P>0.05).结论 MSCT轴面扫描结合三维重组技术对食管鱼刺异物及其周围并发症的检出率高,可作为食管鱼刺异物的首选检查方法. 相似文献
82.
Taschner CA Thines L El-Mahdy M Rachdi H Gauvrit JY Lejeune JP Pruvo JP Leclerc X 《Neuroradiology》2009,51(1):45-52
Introduction The purpose of this study was to determine whether coil embolisation with a new complex-shaped Guglielmi Detachable Coil (GDC
360°; Boston Scientific Neurovascular, Fremont, CA, USA) has any effect on the stability of aneurysm occlusion.
Materials and methods Fifty-one consecutive patients with intracranial aneurysms treated with GDC 360° were included. Angiographic results and adverse
neurological events during the follow-up period were recorded. For 38 patients treated with GDC 360° with available follow-up
data, a corresponding patient treated with GDC 3D was identified from our database. Matches were sought for rupture status,
location, aneurysmal size, and neck size. The angiographic outcome of these matched controls at 6 months was compared to aneurysms
treated with GDC 360°.
Results Initial angiographic controls for 38 patients treated with GDC 360° showed complete occlusion in 32 aneurysms, and a neck
remnant in six. At 6-month follow-up, complete occlusion was found in 29, a neck remnant in eight, and a residual aneurysm
in one. One patient treated with GDC 360° needed retreatment for a major recanalisation. In 38 matched patients treated with
GDC 3D, initial angiographic controls found complete aneurysmal occlusion in 30 aneurysms and a residual neck in 8. At 6-month
follow-up, 24 aneurysms were completely occluded, ten showed a neck remnant, and residual aneurysms were seen in four. Four
patients, treated with GDC 3D, were retreated for major aneurysm recanalisations.
Conclusion Our data suggests that endovascular coil embolisation with GDC 360° might improve long-term stability of coiled aneurysms
when compared to GDC 3D. 相似文献
83.
Greene ND Bernard DL Taschner PE Lake BD de Vos N Breuning MH Gardiner RM Mole SE Nussbaum RL Mitchison HM 《Molecular genetics and metabolism》1999,66(4):309-313
JNCL is a neurodegenerative disease of childhood caused by mutations in the CLN3 gene. A mouse model for JNCL was created by disrupting exons 1-6 of Cln3, resulting in a null allele. Cln3 null mice appear clinically normal at 5 months of age; however, like JNCL patients, they exhibit intracellular accumulation of autofluorescent material. A second approach will generate mice in which exons 7 and 8 of Cln3 are deleted, mimicking the common mutation in JNCL patients. 相似文献
84.
G. Talley Holman MBA PhD Robert E. Thomas PE CPE PhD Kathleen C. Brown RN PhD 《Journal of Orthopaedic Nursing》2009,13(4):172-182
This article is one of a two part series examining the people and environment associated with patient handling. The approach used was that of an occupational injury investigation of a job class, which incorporates defining in the task, environment, tools, and worker health status. Hence, the objective of this portion of the research was to develop a method and use it to compare the physical and mental health of Alabama nurses with known normative populations to determine a baseline of overall health. For this purpose, the validated SF-36© survey was used to collect data on Alabama nurses who had been registered in the state for at least one year. The potential participant pool included 1000 nurses randomly selected from more than 49,000 registered. Physical mailers with a pre-paid return envelope and a follow-up reminder post-card were used. A return rate of 10% was expected based on nursing literature. One hundred and one surveys were returned with 87 being complete. Results confirmed that nursing in the US is a female dominated profession with the survey matching both the Alabama and US national average of 92%. Comparisons of the sample data to general populations yielded significant differences in 3 of the 8 outcome measures: social functioning; physical functioning; bodily pain. In each of these measures, Alabama nurses had a reduced health status compared to at least one comparative population. Additionally, data related to body mass index (BMI) for Alabama nurses were stratified by gender and age. Results indicated 28% had a “healthy” BMI with 37% and 35% of the nurses being “overweight” or “obese”, respectively. Consequently, results suggest Alabama nurses have a reduced health status compared to normative populations and show similar but not identical BMI trends to the general populations for the state of Alabama and the US, which warrants concerns about potential declines in health status among caregivers.
Significance to healthcare
Nurses constitute the largest proportion of the healthcare industry’s workforce. Understanding the perceptions of health status of this employee group is essential to gain further information about possible influences of health on nurses’ ability to continue to perform their jobs. 相似文献85.
86.
87.
Mediastinal tumors: evaluation with suprasternal sonography 总被引:1,自引:0,他引:1
Twelve patients with mediastinal masses evaluated by computed tomography (CT) and histologically verified were evaluated sonographically by means of the suprasternal approach. Eleven of 12 mediastinal tumors could be visualized sonographically, mainly as hypoechoic and perivascularly situated masses, and could be located topographically with a fair degree of certainty. Suprasternal sonography is particularly useful in the detection of small, perivascular lymphomas of the supraaortic branches. In patients with problematic CT findings, particularly children and patients with allergies to contrast media, suprasternal sonography can provide important additional information. Moreover, suprasternal sonography can be used to determine the consistency and to monitor the treatment of mediastinal tumors. Finally, the suprasternal approach is suitable for sonographically guided biopsies of mediastinal tumors. 相似文献
88.
JE Osborne PE Hutchinson 《Journal of the European Academy of Dermatology and Venereology》2002,16(4):367-373
Little attention is given to accurate dosage of topical medication which is a potential source of side-effects and treatment failure. There are studies on the dosage for 'sparing' application relevant to topical steroids but not for 'liberal' application. Though calcipotriol is a first line topical treatment for psoriasis, approximately one-third of patients do not respond adequately. The aims of the present study were to define liberal dosage, to develop a method of calculation of area of involved skin and to evaluate the efficacy of calcipotriol in optimized liberal dosages, based on preliminary studies, in calcipotriol treatment failures. Weight/unit area of ointment and cream base, constituting liberal application, was determined in six normal volunteers. The area of psoriatic involvement in 24 calcipotriol non-responders was estimated by a 'fill-up' method and a modified 'hand' method. The results of the two methods were similar (Pearson correlation coefficient 0.68, P < 0.0001) but the 'hand' method proved easier in use and was the preferred method for the rest of the study. The patients applied calcipotriol at their accustomed rates for at least 2 weeks and then at the calculated liberal rates, using cream in the morning and ointment at night, for 4 weeks. The efficacy measures were Psoriasis Area and Severity Index (PASI) (primary measure), a four-point efficacy score and a visual analogue scale. As a result of the preliminary study and the actual amounts used by the patients in the psoriasis treatment study reported below, liberal application has been defined as 50 g/m2 per application for ointment base and 40 g/m2 per application for cream. At this dosage, an average individual would use approximately 100 g of medication/week to treat 10% of the body surface. During the 4-week treatment study, the psoriasis patients used an average of 39 g (SD 17 g)/m2 per application of cream and 52 g (SD 13 g)/m2 per application of ointment. All efficacy measures showed marked improvement (P < 0.0001). The frequency distribution of the PASI reduction defined responsive (70% of patients) and poorly responsive groups (30%), with mean PASI reduction of 60% and 17%, respectively. 相似文献
89.
JOSHUA E. LANE MD EDWARD M. O''BRIEN PHD PE DAVID E. KENT MD 《Dermatologic surgery》2006,32(5):669-675
PURPOSE: Electrosurgery is routinely used in cutaneous surgery for hemostasis. Thermocautery can be used in patients with implantable cardiac devices. This technique relies on heat without electrical current passing through the patient to produce hemostasis. The temperatures and utility of a commercially available, adjustable thermocautery unit are examined. METHODOLOGY: Tip temperature of the commercially available thermocautery unit was measured in air and tissue via a type E thermocouple (0.002 in. diameter) around the unit's tip. Time intervals of 20 to 30 seconds were recorded at device settings 1 to 9 in air and 3 to 8 on surgical patients (Institutional Review Board approval obtained). RESULTS: In vitro analysis demonstrated predictable temperatures at increasing settings in air: 350 to 900 degrees C. Analysis in vivo during surgery demonstrated similar findings. Tissue contact decreased tip temperature by approximately 50% from in vitro values, and use in a bloody field caused a further decrease in the tip temperature. CONCLUSION: The thermocautery unit examined is an effective and safe unit to achieve hemostasis. In addition, the temperature may be adjusted as opposed to hand-held units that operate at in vitro temperatures exceeding 1,400 degrees F. Hemostasis at approximately 100 to 400 degrees C provided optimal hemostasis. 相似文献
90.