全文获取类型
收费全文 | 2571篇 |
免费 | 234篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 31篇 |
儿科学 | 84篇 |
妇产科学 | 105篇 |
基础医学 | 283篇 |
口腔科学 | 98篇 |
临床医学 | 354篇 |
内科学 | 381篇 |
皮肤病学 | 57篇 |
神经病学 | 229篇 |
特种医学 | 72篇 |
外科学 | 382篇 |
综合类 | 138篇 |
一般理论 | 4篇 |
预防医学 | 311篇 |
眼科学 | 21篇 |
药学 | 167篇 |
中国医学 | 1篇 |
肿瘤学 | 89篇 |
出版年
2021年 | 43篇 |
2019年 | 53篇 |
2018年 | 56篇 |
2017年 | 46篇 |
2016年 | 45篇 |
2015年 | 42篇 |
2014年 | 67篇 |
2013年 | 56篇 |
2012年 | 108篇 |
2011年 | 114篇 |
2010年 | 94篇 |
2009年 | 72篇 |
2008年 | 79篇 |
2007年 | 76篇 |
2006年 | 114篇 |
2005年 | 106篇 |
2004年 | 95篇 |
2003年 | 105篇 |
2002年 | 85篇 |
2001年 | 72篇 |
2000年 | 74篇 |
1999年 | 65篇 |
1998年 | 23篇 |
1997年 | 33篇 |
1996年 | 29篇 |
1995年 | 21篇 |
1994年 | 23篇 |
1992年 | 43篇 |
1991年 | 48篇 |
1990年 | 47篇 |
1989年 | 32篇 |
1988年 | 45篇 |
1987年 | 45篇 |
1986年 | 45篇 |
1985年 | 47篇 |
1984年 | 31篇 |
1983年 | 27篇 |
1982年 | 23篇 |
1979年 | 28篇 |
1978年 | 27篇 |
1977年 | 19篇 |
1976年 | 23篇 |
1974年 | 26篇 |
1973年 | 20篇 |
1972年 | 20篇 |
1971年 | 19篇 |
1970年 | 19篇 |
1969年 | 26篇 |
1968年 | 24篇 |
1966年 | 30篇 |
排序方式: 共有2807条查询结果,搜索用时 15 毫秒
31.
STUDY DESIGN: Patient satisfaction with the cosmetic result of spinal fusion surgery was studied in 42 cases of adolescent idiopathic scoliosis. Neutral or dissatisfied patients were compared with satisfied patients on several physical and psychological characteristics. OBJECTIVES: To determine whether adolescents generally report satisfaction with the postoperative appearance of their back after the correction of severe curves and whether preoperative medical and/or psychological factors distinguish between patients who will report satisfaction with the cosmetic surgical result from those who will report neutrality or dissatisfaction. SUMMARY OF BACKGROUND DATA: Previous reports emphasize the need for medical outcomes research that evaluates both patient satisfaction and technical success. Patient satisfaction with spinal surgery has largely been evaluated in retrospective studies and most consistently related to postoperative cosmesis and degree of curve correction. METHODS: Forty-two adolescents with idiopathic scoliosis without comorbidity, who were 12 years 6 months of age or older, and who did not require both anterior and posterior spinal fusion, were studied preoperatively and postoperatively by physical and psychological measurements. RESULTS: Of patients undergoing surgical correction of severe curves, 73% reported satisfaction with the cosmetic result. Neutral or dissatisfied patients were more likely than satisfied patients to have a lower body mass index (P < 0.05), to be younger in menarcheal status (P < 0.05), and have a King II or King III curve type. Preoperative psychological difficulties (P < 0.05) and unmet expectations regarding the postoperative cosmesis (P < 0.05) were more common among neutral or dissatisfied patients. CONCLUSIONS: Most adolescents with idiopathic scoliosis expressed satisfaction with the cosmetic surgical result. Preoperative physical characteristics, psychological difficulties, and unrealistic expectations regarding postoperative cosmesis are associated with patient neutrality or dissatisfaction. 相似文献
32.
Krisher SL Browne A Dibbins A Tkacz N Curci M 《Archives of surgery (Chicago, Ill. : 1960)》2001,136(4):438-441
HYPOTHESIS: The incidence of postoperative intra-abdominal abscess is higher after laparoscopic compared with open appendectomy for perforated appendicitis. METHODS: A historical cohort study of pediatric patients operated on for suspected appendicitis by open appendectomy or laparoscopic appendectomy compares the incidence of postoperative intra-abdominal abscess for each procedure. SETTING: A tertiary care center. PATIENTS: Five hundred thirty-eight pediatric patients were operated on for suspected appendicitis at our institution between 1974 and 1999. Of these, 453 were included in the study. Of the excluded patients, 9 had incomplete medical records, 69 had normal or interval appendectomies, and 7 had appendixes removed by methods other than laparoscopy or right lower quadrant incision. INTERVENTIONS: Open appendectomy performed through a right lower quadrant incision or laparoscopic appendectomy performed through a 3-trocar approach by 1 of 3 pediatric surgeons at our institution. MAIN OUTCOME MEASURE: The incidence of postoperative intra-abdominal abscess after laparoscopic vs open appendectomy. RESULTS: In perforated appendicitis (170 patients), the incidence of postoperative abscess after laparoscopic appendectomy was 24% vs 4.2% after open appendectomy. The relative risk ratio of developing a postoperative abscess after perforated appendicitis was 5.6 (confidence interval, 2.1-16.0) after laparoscopic vs open appendectomy. The results remained significant when controlled for age, sex, intraoperative irrigation, and preoperative antibiotics. Postoperative abscess in all acute, gangrenous, and perforated appendicitis after laparoscopic appendectomy was 6.4% vs 3.0% after open appendectomy. This was not statistically significant. CONCLUSION: There is a significant increase in the incidence of postoperative intra-abdominal abscess with perforated appendicitis after laparoscopic compared with open appendectomy in pediatric patients. 相似文献
33.
Nerve conduits and acellular nerve allograft offer efficient and convenient tools for overcoming unexpected gaps during nerve repair. Both techniques offer guidance for migrating Schwann cells and axonal regeneration though utilizing very different scaffolds. The substantially greater amount of animal and clinical data published on nerve conduits is marked by wide discrepancies in results that may be partly explained by a still poorly defined critical repair gap and diameter size. The available information on acellular allografts appears more consistently positive though this tool is also hampered by a longer but also limited critical length. This article reviews the current relative literature and examines pertinent parameters for application of both acellular allograft and nerve conduits in overcoming short nerve gaps. 相似文献
34.
Kathleen M. Adelgais Lorin Browne Maija Holsti Ryan R. Metzger Shannon Cox Murphy Nanette Dudley 《Journal of pediatric surgery》2014
Background
Guidelines for evaluating the cervical spine in pediatric trauma patients recommend cervical spine CT (CSCT) when plain radiographs suggest an injury. Our objective was to compare usage of CSCT between a pediatric trauma center (PTC) and referral general emergency departments (GEDs).Methods
Patient data from a pediatric trauma registry from 2002 to 2011 were analyzed. Rates of CSI and CSCT of patients presenting to the PTC and GED were compared. Factors associated with use of CSCT were assessed using multivariate logistic regression.Results
5148 patients were evaluated, 2142 (41.6%) at the PTC and 3006 (58.4%) at the GED. Groups were similar with regard to age, gender, GCS, and triage category. GED patients had a higher median ISS (14 vs. 9, p < 0.05) and more frequent ICU admissions (44.3% vs. 26.1% p < 0.05). CSI rate was 2.1% (107/5148) and remained stable. CSCT use increased from 3.5% to 16.1% over time at the PTC (mean 9.6% 95% CI = 8.3, 10.9) and increased from 6.8% to 42.0% (mean 26.9%, CI = 25.4, 28.4) at the GED. Initial care at a GED remained strongly associated with CSCT.Conclusions
Despite a stable rate of CSI, rate of CSCT increased significantly over time, especially among patients initially evaluated at a GED. 相似文献35.
F K Lin S Suggs C H Lin J K Browne R Smalling J C Egrie K K Chen G M Fox F Martin Z Stabinsky et al. 《Proceedings of the National Academy of Sciences of the United States of America》1985,82(22):7580-7584
The human erythropoietin gene has been isolated from a genomic phage library by using mixed 20-mer and 17-mer oligonucleotide probes. The entire coding region of the gene is contained in a 5.4-kilobase HindIII-BamHI fragment. The gene contains four intervening sequences (1562 base pairs) and five exons (582 base pairs). It encodes a 27-amino acid signal peptide and a 166-amino acid mature protein with a calculated Mr of 18,399. The erythropoietin gene, when introduced into Chinese hamster ovary cells, produces erythropoietin that is biologically active in vitro and in vivo. 相似文献
36.
This study explored the psychological impact of exposure to work-related trauma among journalists. It was hypothesised that positive associations would exist between (a) exposure and PTSD symptoms, (b) exposure and guilt cognitions, and (c) guilt cognitions and PTSD symptoms, and that the relationship between exposure and PTSD symptoms would be mediated by guilt cognitions. The sample consisted of 50 journalists (response rate = 15%), who had recently been exposed to work-related trauma. They were predominantly male, aged 40 years or older, well-educated, and most had worked in journalism for at least 15 years. Participants completed an online questionnaire that explored their work-related experiences of trauma, PTSD symptoms, and trauma-related guilt cognitions. The findings showed that higher levels of exposure to work-related trauma were significantly associated with higher levels of PTSD symptoms (r = .36) and trauma-related guilt cognitions (r = .29). Guilt cognitions were significantly and positively independently associated with PTSD symptoms (r = .12) and were consistent with partial mediation of relationship between exposure to work-related trauma and PTSD symptoms. This study provides greater insight into the psychological processing of work-related traumatic events among journalists and emphasizes the importance of posttrauma appraisals of guilt regarding their experiences. 相似文献
37.
AX Holterman M Holterman A Browne S Henriques G Guzman G Fantuzzi 《Journal of pediatric surgery》2012,47(9):1633-1639
PurposeThe aim of the study was to compare the baseline and the 18-month follow-up for weight and metabolic characteristics of superobese (SO) (body mass index [BMI] ≥50 kg/m2) and morbidly obese (MO) (BMI <50 kg/m2) adolescents who participated in a prospective longitudinal study of gastric banding delivered in an adolescent multidisciplinary treatment program.MethodsClinical information was extracted from an institutional review board–approved database of bariatric adolescents. Fasting cytokine and acute phase protein serum levels were analyzed by enzyme-linked immunosorbent assay. Liver histopathologies were assessed using the Kleiner's classification score.ResultsOther than BMI, MO (n = 11) and SO (n = 7) patients have similar degree of insulin resistance, dyslipidemia, and nonalcoholic fatty liver disease. Serum C-reactive protein (10.2 ± 5.6 SO vs 4 ± 3.9 μg/mL MO [P < .02]) and leptin (71 ± 31 SO vs 45 ± 28 MO ng/mL [P = .04]) were more elevated in SO patients. Although weight loss is similar (30 ± 19 kg MO vs 28 ± 12 kg SO, P = .8 at 18 months; mean percent change in BMI, 22.8% ± 11.6% vs 20.5% ± 10.3% SO, P = .2), SO patients has less resolution of insulin resistance and dyslipidemia but experienced significantly improved health-related quality of life.ConclusionsThe SO adolescents demonstrate equivalent short-term weight loss and improved quality of life but delayed metabolic response to a gastric banding–based weight loss treatment program compared with MO patients, illustrating the importance of early referral for timely intervention of MO patients. 相似文献
38.
Tetik C Ozer K Ayhan S Siemionow K Browne E Siemionow M 《Annals of plastic surgery》2002,49(4):397-403
Three methods of nerve repair involving the epineural sleeve technique were compared with conventional nerve repair using the rat sciatic nerve transection model in four groups. In group 1, the sciatic nerve was repaired using the conventional epineural technique by placing four sutures. In groups 2, 3, and 4, the epineural sleeve technique was combined with two sutures, fibrin glue, and two sutures with fibrin glue, respectively. Functional recovery was evaluated using walking track analysis, limb circumference, and the severity of toe contracture. Diameter of the sciatic nerve fibers, total number of myelinated fibers, diameter of the myelin sheath, and the axon-to-fiber diameter ratio were measured at 12 weeks. The results showed better functional recovery as well as a higher number of myelinated fibers in groups using the epineural sleeve technique compared with conventional technique ( < 0.05). The addition of fibrin glue, however, did not make any significant difference. The epineural sleeve technique was found to be superior when compared with conventional nerve repair, providing faster functional recovery and improved nerve regeneration. 相似文献
39.
Nuttall MC van der Meulen JH Browne JP Emberton M Coomer M Mundy AR Morris PJ 《Journal of the American College of Surgeons》2005,200(2):186-190
BACKGROUND: The Research Fellowship Scheme of the Royal College of Surgeons of England commenced in 1993 with the aim of exposing selected surgical trainees to research techniques and methodology, with the hope of having an impact on surgical research and increasing the cadre of young surgeons who might decide to pursue an academic career in surgery. Over 11 million pounds sterling (approximately US 20 million dollars) has been invested in 264 fellowships. The College wished to evaluate the impact of the Scheme on the careers of research fellows, surgical research, and patient care. As the 10th anniversary of the Scheme approached. STUDY DESIGN: Two-hundred and sixty research fellows whose current addresses were available were sent a questionnaire. Two-hundred and thirty-eight (91.5%) responded. RESULTS: Three-quarters of the research fellows conducted laboratory-based research, with most of the remainder conducting patient-based clinical research. One-third of the fellows who have reached consultant status have an academic component to their post. The total number of publications based on fellowship projects was 531, with a median impact factor of 3.5. Almost all fellows had been awarded a higher degree or were working toward this. Half of the fellows received subsequent funding for research, mostly awarded by national or international funding bodies. CONCLUSIONS: The Research Fellowship Scheme of the Royal College of Surgeons of England has successfully supported many trainee surgeons in the initial phase of their research career. It has helped surgical research by increasing the pool of surgeons willing to embark on an academic career. Indirectly, patient care has benefited by promoting an evidence-based culture among young surgeons. Such schemes are relevant to surgical training programs elsewhere if more young surgeons are to be attracted into academic surgery. 相似文献