全文获取类型
收费全文 | 574篇 |
免费 | 15篇 |
国内免费 | 1篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 17篇 |
妇产科学 | 18篇 |
基础医学 | 38篇 |
口腔科学 | 29篇 |
临床医学 | 69篇 |
内科学 | 117篇 |
皮肤病学 | 6篇 |
神经病学 | 40篇 |
特种医学 | 23篇 |
外科学 | 92篇 |
综合类 | 14篇 |
预防医学 | 24篇 |
眼科学 | 30篇 |
药学 | 16篇 |
中国医学 | 3篇 |
肿瘤学 | 31篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 14篇 |
2017年 | 8篇 |
2016年 | 5篇 |
2015年 | 11篇 |
2014年 | 16篇 |
2013年 | 18篇 |
2012年 | 44篇 |
2011年 | 47篇 |
2010年 | 16篇 |
2009年 | 10篇 |
2008年 | 46篇 |
2007年 | 47篇 |
2006年 | 61篇 |
2005年 | 45篇 |
2004年 | 35篇 |
2003年 | 32篇 |
2002年 | 40篇 |
2001年 | 12篇 |
2000年 | 9篇 |
1999年 | 7篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 6篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1987年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 3篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1924年 | 1篇 |
排序方式: 共有590条查询结果,搜索用时 12 毫秒
71.
72.
Sami Karapolat Suat Gezer Umran Yildirim Talha Dumlu Banu Karapolat Ismet Ozaydin Mehmet Yasar Abdulkadir Iskender Hayati Kandis Ayhan Saritas 《Journal of cardiothoracic surgery》2011,6(1):14
Background
Carbon dioxide (CO2) pneumoperitoneum facilitates the visualization of abdominal organs during laparoscopic surgery. However, the associated increase in intra-abdominal pressure causes oxidative stress, which contributes to tissue injury. 相似文献73.
There are limited studies on nursing diagnoses of the elderly living in nursing homes worldwide. This study aimed to define the most frequent nursing diagnoses in the elderly residents of a nursing home elder care and rehabilitation center. Seventy-four elderly individuals were included in the study. Data were collected using the “Elderly Individual’s Introduction Form” between April 2007 to August 2007. The content of the form was based on a guide to gerontologic assessment, and Gordon’s Functional Health Patterns. The nursing diagnoses (NANDA-I Taxonomy II) were identified by the 2 researchers separately according to the defining characteristics and the risk factors. The consistency between the nursing diagnoses defined by the 2 researchers was evaluated using Cohen’s kappa (κ). There was an 84.7% agreement about nursing diagnoses defined by the 2 researchers separately. The weighted kappa consistency analyses showed there was an adequate level of consistency (κ = 0.710), and the findings were significant (p < 0.0001). The most frequent diagnoses were ineffective role performance (86.5%), ineffective health maintenance (81.2%), risk for falls (77%), and impaired physical mobility (73%). The diagnosis of ineffective role performance was more frequent in patients with dementia (x2 =10.993, df = 1, p = 0.001). There was a very significant relationship between dementia and the diagnosis of impaired verbal communication (x2 = 32.718, df = 1, p = 0.0001). The relationship between mobility disorder and self-care deficit was also significant (x2 = 19.411, df = 1, p = 0.0001). To improve quality in patient care, nurses should use nursing diagnoses with a systematic assessment and should help the elderly in health promotion or use of the maximum current potential. 相似文献
74.
75.
Bayindir Y Firat AK Kayabas U Alkan A Yetkin F Karakas HM Yologlu S 《Medical hypotheses》2012,79(1):43-46
Cutaneous anthrax, caused by Bacillus anthracis contacting the skin, is the most common form of human anthrax. Recent studies implicate the presence of additional, possibly toxin-related subtle changes, even in patients without neurological or radiological findings. In this study, the presence of subtle changes in cutaneous anthrax was investigated at the metabolite level using magnetic resonance spectroscopy. Study subjects were consisted of 10 patients with cutaneous anthrax without co-morbid disease and/or neurological findings, and 13 healthy controls. There were no statistical differences in age and gender between two groups. The diagnosis of cutaneous anthrax was based on medical history, presence of a typical cutaneous lesion, large gram positive bacilli on gram staining and/or positive culture for B. anthracis from cutaneous samples. Brain magnetic resonance imaging examination consisted of conventional imaging and single-voxel magnetic resonance spectroscopy. Magnetic resonance spectroscopy was performed by using point-resolved spectroscopy sequence (TR: 2000ms, TE: 136ms, 128 averages). Voxels of 20mm×20mm×20mm were placed in normal-appearing parietal white matter to detect metabolite levels. Cerebral metabolite peaks were measured in normal appearing parietal white matter. N-acetyl aspartate/creatine and choline/creatine ratios were calculated using standard analytical procedures. Patients and controls were not statistically different regarding parietal white matter N-acetyl aspartate/creatine ratios (p=0.902), a finding that implicates the conservation of neuronal and axonal integrity and neuronal functions. However, choline/creatine ratios were significantly higher in patient groups (p=0.001), a finding implicating an increased membrane turnover. In conclusion, these two findings point to a possibly anthrax toxins-related subtle inflammatory reaction of the central nervous system at the cellular level. 相似文献
76.
AIM/OBJECTIVE: The aim of this study was to perform periodontal assessment, using the CPITN index, on patients undergoing renal dialysis. METHODS: The periodontal conditions of 342 subjects undergoing renal dialysis from eight renal dialysis centres were examined using CPITN. Subjects were distributed into four age groups, 16-19, 20-34, 35-44 and > or =45 years. The study was conducted during a 6-month period. All clinical examinations were performed by one examiner. RESULTS: There was a significant positive relationship between the CPITN scores and age (r=0.164, p=0.002) and dialysis duration (r = 0.240, p=0.000). There was no statistically significant difference between male and female patients (p>0.05). None of the age groups had healthy sextants. The 35-44 year-age group had a higher number of sextants with deep pockets (0.19) than the other age groups and edentulous sextants were the highest among the oldest age group (1.89). CONCLUSION: A very small portion of the renal dialysis population is affected by severe forms of periodontitis requiring complex periodontal treatment. However, all such patients should be given oral hygiene education as a priority. 相似文献
77.
Effects of smoking on clinical parameters and the gingival crevicular fluid levels of IL-6 and TNF-alpha in patients with chronic periodontitis 总被引:2,自引:0,他引:2
OBJECTIVE: Smoking is an important environmental risk factor for the initiation and progression of periodontal diseases. The aim of this study was to evaluate the effects of smoking on clinical parameters and the gingival crevicular fluid (GCF) contents of the pro-inflammatory cytokines interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha) levels in patients with chronic periodontitis. MATERIAL AND METHODS: The study base consisted of 41 patients including 22 volunteer current smokers with an age range of 32-59 (44.41+/-7.88) years and 19 volunteer non-smokers with an age range of 36-59 (46.94+/-6.07) years. The first month after non-surgical periodontal therapy was accepted as the baseline of the study. The clinical parameters including plaque index (PI), gingival index (GI), bleeding on probing (BOP), probing depth (PD), clinical attachment loss (CAL) were recorded and GCF samples were collected for analysis of GCF contents of IL-6 and TNF-alpha levels. At the 3rd and 6th months, all of these procedures were repeated. RESULTS: In smokers, only CAL was significantly higher at the 3rd month compared with non-smokers (p<0.05). GI and BOP were higher in non-smokers than smokers in both periods (p<0.05). PI showed increases from the initial to the 6th month in smokers (p<0.05). Although the differences between two groups with regard to IL-6 and TNF-alpha were not significant (p>0.05), the total amount of TNF-alpha in GCF decreased from the initial to the 6th month in smokers (p<0.05). There were no significant correlations between the mean total amount of IL-6 and TNF-alpha in GCF and clinical parameters in both evaluation periods in smokers (p>0.05). CONCLUSION: The present study demonstrated that cigarette smoking increases the amount of dental plaque over time in smokers and does not influence GCF contents of IL-6 and TNF-alpha. 相似文献
78.
M. Tayyar Kalcioglu Mehmet T. Cicek Tuba Bayindir Osman Ilkay Ozdamar 《American journal of otolaryngology》2014
Importance
It is important that chronic otitis media with cholesteatoma be treated successfully in patients to protect them from having repeated surgeries with related surgical co-morbidities and hearing loss.Objective
To evaluate the effectiveness of MESNA usage on the residual cholesteatoma rates of the patients who underwent surgery due to chronic otitis media with cholesteatoma.Design
Retrospective single-institution study of a prospectively collected database.Setting
Tertiary University Hospital.Participants
Nine hundred and thirty-four patients underwent surgery due to chronic otitis media between September 2000 and March 2012 by the same surgeon. One hundred and forty-one cases out of 934 patients were selected who had cholesteatoma for the study. These randomly selected 141 cases were divided into two groups as follows: I. Forty-six cases were applied MESNA (Sodium 2-mercaptoethanesulfonate) intraoperatively, and II. Ninety-five cases were not applied MESNA intraoperatively. The cases that were followed-up at least one year were included in this study.Intervention
MESNA (Ureomitexan, MESNA, Baxter oncology, Germany) was diluted with saline (20% MESNA and 80% saline) that was applied, and then a waiting period of approximately 5 min followed to start to dissect cholesteatoma matrix.Main outcomes and measures
Residual cholesteatoma rates between intraoperative MESNA, a disulfide bond breaking chemical agent, applied and MESNA non-applied cases in the postoperative follow-up period were compared for the success of the surgery.Results
MESNA was used in 46 patients out of 141 cases intraoperatively. Twenty-four of these patients underwent CWD (canal wall down), and twenty-two patients underwent CWU (canal wall up) mastoidectomy. For the other 95 subjects, 56 patients with CWD and 39 with CWU mastoidectomy, MESNA was not applied. Residual cholesteatoma rates were found to be significantly higher in MESNA non-applied group than MESNA applied group (p < 0.05). Residual cholesteatoma rates between CWD and CWU mastoidectomy procedures were not statistically significant (p > 0.05).Conclusions and relevance
MESNA application that breaks disulfide bonds in the structure of the matrix in cholesteatoma surgery may assist the elimination of the disease, and increase surgical success by facilitating the elevation of the epithelium. Thereby, it causes a decrease in the possibility of remaining residual epithelium after surgery, which decreases the need for second-look surgery.Trial registration
The retrospective research protocol was approved by the Inonu University Clinical Research Ethics Committee. Registration number:……… 相似文献79.
80.
OBJECTIVE: To compare the efficacy of fentanyl and remifentanil as prodrugs in the prevention of rocuronium injection pain by using a control group. METHODS: In a randomized, double-blinded, controlled study, 102 adult patients aged between 18-60 undergoing elective surgery under general anesthesia and classified into American Society of Anesthesiologists (ASA) I and ASA II risk groups were included in the study. The study was carried out from July 2005 to April 2006 at Dokuz Eylul University, Izmir, Turkey. Unpremedicated patients were randomly allocated to one of 3 groups. Patients received 2 mL (0.02 mg) of remifentanil (n =34), 2 mL of fentanyl 0.1 mg (n =34), and 2 mL of saline (n =34), by injection over 10 seconds. Thirty seconds after prodrug administration, 10 mg (10 mg/mL) intravenous rocuronium bromide was administered over 5 seconds and pain assessment was performed by using a 5-point scale. RESULTS: When the 3 groups of 34 patients were compared in terms of pain assessment scoring, a statistically significant difference was determined (p=0.02). When the groups were paired, it was seen that this difference resulted from the remifentanil and saline groups (p=0.02). CONCLUSION: This study shows that a bolus dose of 0.02 mg of remifentanil is a more effective prodrug administration compared to the application of saline, however, remifentanil and fentanyl have no superiority over one another and the administration of fentanyl is equally effective as saline prodrug administration. 相似文献