全文获取类型
收费全文 | 506篇 |
免费 | 23篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 24篇 |
妇产科学 | 10篇 |
基础医学 | 42篇 |
口腔科学 | 14篇 |
临床医学 | 63篇 |
内科学 | 122篇 |
皮肤病学 | 11篇 |
神经病学 | 9篇 |
特种医学 | 100篇 |
外科学 | 39篇 |
综合类 | 32篇 |
预防医学 | 20篇 |
眼科学 | 15篇 |
药学 | 11篇 |
中国医学 | 1篇 |
肿瘤学 | 24篇 |
出版年
2022年 | 6篇 |
2021年 | 6篇 |
2020年 | 8篇 |
2019年 | 4篇 |
2018年 | 7篇 |
2017年 | 11篇 |
2016年 | 3篇 |
2015年 | 11篇 |
2014年 | 10篇 |
2013年 | 12篇 |
2012年 | 5篇 |
2011年 | 12篇 |
2010年 | 22篇 |
2009年 | 18篇 |
2008年 | 6篇 |
2007年 | 15篇 |
2006年 | 16篇 |
2005年 | 4篇 |
2004年 | 15篇 |
2003年 | 5篇 |
2002年 | 3篇 |
2001年 | 10篇 |
2000年 | 4篇 |
1999年 | 8篇 |
1998年 | 26篇 |
1997年 | 25篇 |
1996年 | 36篇 |
1995年 | 19篇 |
1994年 | 15篇 |
1993年 | 19篇 |
1992年 | 4篇 |
1991年 | 7篇 |
1990年 | 9篇 |
1989年 | 12篇 |
1988年 | 17篇 |
1987年 | 17篇 |
1986年 | 15篇 |
1985年 | 10篇 |
1984年 | 11篇 |
1983年 | 13篇 |
1982年 | 7篇 |
1981年 | 13篇 |
1980年 | 8篇 |
1979年 | 2篇 |
1978年 | 6篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1973年 | 2篇 |
1967年 | 1篇 |
排序方式: 共有539条查询结果,搜索用时 187 毫秒
91.
This study was carried out on 80 patients undergoing tonsillectomy for chronic tonsillitis. Twenty healthy school children in the same age group were investigated for control values. Ten children were also available for evaluation of any immunological change after tonsillectomy. No significant variation was seen in the serum IgG, IgA, and IgM levels before and after tonsillectomy. Peripheral absolute lymphocyte count was higher in the pre-operative cases as compared to the control group, and this count became near normal following tonsillectomy. Skin tests with recall antigens PPD and Candida and contact sensitizing agent 2:4 DNCB showed an improved cell mediated immune response following tonsillectomy. 相似文献
92.
Introduction: A heavier weight in adults is becoming the norm rather than an abnormal weight. Whether the same trend is happening in children is unknown. Objective: To assess the perception of the weight of 4‐ to 5‐year‐old children and the recognition of overweight by both parents. Design: Population‐based survey. Participants: A questionnaire was sent to parents of 1155 4‐ to 5‐year‐old children. Results: In total, 439 questionnaires (35%) were returned. Of all, 90% of the children had a normal weight, 9.3% were overweight and 4.1% were obese. For all weight classes, the parents depicted the child as lighter on both the verbal and visual scale. Of all, 75% of mothers of overweight children stated that the child had a normal weight. In obese children, 50% of the mothers believed that the child had a normal weight. Conclusion: Children with a weight in the normal range were considered by their parents as a little too light or too light. Overweight was considered as normal weight, and obesity as normal or a little too heavy. The perception of a normal weight in children at 4–5 years is distorted. 相似文献
93.
To develop the newer pharmaceuticals and to spur the strong growth, being a general property of 'handedness', chirality plays a major role. The Easson-Stedman principle shows the differences in the biological activity between enantiomers resulted from selective reactivity of one enantiomer with its receptor. It helps to improve the pharmacokinetic properties and to remove undesirable side effects by virtue of the unique activity of enantiomers. Racemic switching and marketing drug combinations are used as tools for drug life-cycle management and to redevelop racemic mixtures as single enantiomers. 相似文献
94.
AJ Wearden L Riste C Dowrick C Chew-Graham RP Bentall RK Morriss S Peters G Dunn G Richardson K Lovell P Powell 《BMC medicine》2006,4(1):1-12
Background
A major change has occurred in the last few years in the therapeutic approach to patients presenting with all forms of acute coronary syndromes. Whether or not these patients present initially to tertiary cardiac care centers, they are now routinely referred for early coronary angiography and increasingly undergo percutaneous revascularization. This practice is driven primarily by the angiographic image and technical feasibility. Concomitantly, there has been a decline in expectant or ischemia-guided medical management based on specific clinical presentation, response to initial treatment, and results of noninvasive stratification. This 'tertiarization' of acute coronary care has been fuelled by the increasing sophistication of the cardiac armamentarium, the peer-reviewed publication of clinical studies purporting to show the superiority of invasive cardiac interventions, and predominantly supporting (non-peer-reviewed) editorials, newsletters, and opinion pieces.Discussion
This review presents another perspective, based on a critical reexamination of the evidence. The topics addressed are: reperfusion treatment of ST-elevation myocardial infarction; the indications for invasive intervention following thrombolysis; the role of invasive management in non-ST-elevation myocardial infarction and unstable angina; and cost-effectiveness and real world considerations. A few cases encountered in recent practice in community and tertiary hospitals are presented for illustrative purposes The numerous and far-reaching scientific, economic, and philosophical implications that are a consequence of this marked change in clinical practice as well as healthcare, decisional and conflict of interest issues are explored.Summary
The weight of evidence does not support the contemporary unfocused broad use of invasive interventional procedures across the spectrum of acute coronary clinical presentations. Excessive and unselective recourse to these procedures has deleterious implications for the organization of cardiac health care and undesirable economic, scientific and intellectual consequences. It is suggested that there is need for a new equilibrium based on more refined clinical risk stratification in the treatment of patients who present with acute coronary syndromes. 相似文献95.
Harsha Bhattacharjee Kasturi Bhattacharjee Pankaj Bhattacharjee Dipankar Das Krishna Gogoi Diyali Arati 《Indian journal of ophthalmology》2014,62(5):580-584
Aims:
To describe liquefied after cataract (LAC) and its surgical management following an uneventful phacoemulsification with posterior chamber in-the-bag intraocular lens (IOL) implantation and continuous curvilinear capsulorrhexis (CCC).Design:
Interventional case series.Materials and Methods:
Eleven patients with LAC, following uneventful phacoemulsification with CCC and in-the-bag IOL implantation were enrolled. After the basic slit lamp examination, each case was investigated with Scheimpflug photography and ultrasound biomicroscopy (UBM). Each case was treated with capsular lavage. Biochemical composition of the milky fluid was evaluated and ring of anterior capsular opacity (ACO) was examined under electron microscope.Results:
All 11 cases presented with blurring of vision after 6-8 years of cataract surgery with IOL implantation. All cases had IOL microvacuoles, 360° anterior capsule, and anterior IOL surface touch along with ACO, ring of Soemmering, and posterior capsule distension filled with opalescent milky fluid with whitish floppy or crystalline deposits. Biochemically, the milky fluid contained protein (800 mg/dl), albumin (100 mg/dl), sugar (105 mg/dl), and calcium (0.13%) and was bacteriologically sterile. Histologically, the dissected ACO showed fibrous tissue. All cases were successfully treated with capsular lavage with good visual recovery and with no complication. There was no recurrence of LAC during 2 years postoperative follow-up in any of the cases.Conclusions:
LAC is a late complication of standard cataract surgery. It may be a spectrum of capsular bag distension syndrome (CBDS) without shallow anterior chamber and secondary glaucoma. Capsular bag lavage is a simple and effective treatment for LAC and a safe alternative to neodymium-doped yttrium aluminum garnet (Nd-YAG) capsulotomy. 相似文献96.
RP Dayasena MBKC Dayasiri C Jayasuriya DSC Perera 《The Australasian medical journal》2011,4(2):101-104
Background
Chronic suppurative otitis media (CSOM) is assumed to be a complication of acute otitis media (AOM), but the risk factors for CSOM are not clear. Objectives: 1. To study the aetiological organisms for CSOM. 2. To identify the effect of demographic factors on disease manifestation.Method
This retrospective study included a case series of 234 patients who had been admitted to National Hospital of Sri Lanka (NHSL), with the complaint of ear discharge and from whom the specimens were sent for microscopy and culture at Department Of Microbiology, NHSL. The period of analysis was 1 year extending from 1 January 2009 to 31 December 2009.Consecutive patients who fulfilled the inclusion criteria were recruited to the retrospective analysis.Results
Among 234 patients studied, 129 (55.1%) were male and 150 (64.1%) were under 40 yrs old. The mean age was 39.5 yrs (range 12 to 60 yrs, SD = 22.6). The mean duration of ear discharge was 1.2 yrs. (range 6 weeks to 20 yrs.) Pseudomonas species (29.5%) was the commonest microbial organism to cause ear discharge, followed by staphylococcus (20.5%) and coliform (16.7%) species. Among the fungal agents identified, candida was the most common. 23.1% of the cultures did not reveal any microbiological agent. Eighteen patients (8%) had a prior history of trauma to the affected ear and 51 patients (21.8%) were diagnosed with diabetes mellitus.Conclusion
The commonest microbial agents implicated in CSOM was pseudomonas species followed by staphylococci and coliforms. Demographic variables such as gender or age did not seem to affect the disease manifestation significantly, though CSOM was less common among elderly and women. 相似文献97.
Ian RP Sunderland Glenn Edwards James Mainprize Oleh Antonyshyn 《CANADIAN JOURNAL OF PLASTIC SURGERY》2015,23(2):95-99
Prefabricated, patient-specific alloplastic implants for cranioplasty reduce surgical complexity, decrease operative times, minimize exposure and risk of contamination, and have resulted in improved aesthetic results. However, in creating a prefabricated custom implant using a patient’s computed tomography data, a stable, unalterable defect must be clearly defined before surgery. In the event that an intraoperative modification of an exiting skull defect is required, or in cases of tumour resection in which the size of the skull defect is unknown preoperatively, these prefabricated implants cannot be used. The ideal method for alloplastic cranioplasty would enable cost-effective creation of a patient-specific implant with the capacity for intraoperative modification.The present article describes a novel technique of cranioplasty that uses a patient’s computed tomography data to create a custom forming tool (ie, mold), enabling intraoperative creation of a patient-specific titanium mesh implant. The utility of these implants in creating a custom reconstructive solution in cases in which the size of the skull defect is unknown preoperatively will be demonstrated using two case presentations. 相似文献
98.
99.
100.