全文获取类型
收费全文 | 10820篇 |
免费 | 647篇 |
国内免费 | 78篇 |
专业分类
耳鼻咽喉 | 75篇 |
儿科学 | 301篇 |
妇产科学 | 383篇 |
基础医学 | 1678篇 |
口腔科学 | 333篇 |
临床医学 | 902篇 |
内科学 | 2348篇 |
皮肤病学 | 237篇 |
神经病学 | 1184篇 |
特种医学 | 392篇 |
外科学 | 971篇 |
综合类 | 48篇 |
一般理论 | 5篇 |
预防医学 | 826篇 |
眼科学 | 194篇 |
药学 | 758篇 |
1篇 | |
中国医学 | 54篇 |
肿瘤学 | 855篇 |
出版年
2024年 | 30篇 |
2023年 | 129篇 |
2022年 | 252篇 |
2021年 | 394篇 |
2020年 | 261篇 |
2019年 | 302篇 |
2018年 | 345篇 |
2017年 | 275篇 |
2016年 | 309篇 |
2015年 | 356篇 |
2014年 | 447篇 |
2013年 | 523篇 |
2012年 | 877篇 |
2011年 | 897篇 |
2010年 | 455篇 |
2009年 | 441篇 |
2008年 | 643篇 |
2007年 | 693篇 |
2006年 | 637篇 |
2005年 | 649篇 |
2004年 | 562篇 |
2003年 | 452篇 |
2002年 | 420篇 |
2001年 | 102篇 |
2000年 | 102篇 |
1999年 | 125篇 |
1998年 | 99篇 |
1997年 | 78篇 |
1996年 | 57篇 |
1995年 | 65篇 |
1994年 | 35篇 |
1993年 | 51篇 |
1992年 | 39篇 |
1991年 | 41篇 |
1990年 | 41篇 |
1989年 | 32篇 |
1988年 | 29篇 |
1987年 | 30篇 |
1986年 | 31篇 |
1985年 | 20篇 |
1984年 | 16篇 |
1983年 | 20篇 |
1982年 | 18篇 |
1981年 | 14篇 |
1979年 | 16篇 |
1976年 | 11篇 |
1974年 | 10篇 |
1972年 | 14篇 |
1970年 | 11篇 |
1969年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
The aims of this study were to adapt the Body Image Quality of Life Inventory (BIQLI) into Brazilian Portuguese (BP) and to assess the psychometric properties of the adapted version. Construct validity was assessed by correlating the BIQLI‐BP scores with the Rosenberg's Self‐Esteem Scale, with Burns Specific Health Scale—Revised (BSHS‐R), and with gender, total body surface area burned, and visibility of the scars. Participants were 77 adult burn patients. Cronbach's alpha for the adapted version was .90 and moderate linear correlations were found between body image and self‐esteem and between BIQLI‐BP scores and two domains of the BSHS‐R: affect and body image and interpersonal relationships. The BIQLI‐BP showed acceptable levels of reliability and validity for Brazilian burn patients. © 2013 Wiley Periodicals, Inc. Res Nurs Health 36:299–310, 2013 相似文献
62.
63.
Aim. To report the development and psychometric testing of the Moral Distress Thermometer. The Moral Distress Thermometer is a new screening tool to measure moral distress in nurses who practise in the hospital setting. Background. Moral distress occurs when one knows the ethically correct thing to do, but is prevented from acting on that perceived obligation. It is a well documented phenomenon with negative consequences that may be experienced by nurses. Creating an instrument to effectively and efficiently measure moral distress in a timely way has been identified as a priority for nursing. Design. This study used a cross‐sectional survey design. Methods. Data collection for this research occurred in 2009. Participants simultaneously completed either the adult or pediatric version of the Moral Distress Scale version 2009 and the Moral Distress Thermometer. A total of 529 participants from various clinical areas completed both tools. Results. Coefficients alpha were adequate for both Adult (0·90) and Pediatric (0·92) Moral Distress Scale 2009 scales. Statistically significant Pearson correlations were found for the Moral Distress Thermometer with Adult Moral Distress Scale 2009 and Pediatric Moral Distress Scale 2009 and higher Moral Distress Thermometer, Adult Moral Distress Scale 2009 and Pediatric Moral Distress Scale 2009 means for participants who had left or who considered leaving a position because of moral distress. Conclusion. These findings provide support for the validity of the Moral Distress Thermometer. 相似文献
64.
65.
66.
Margari L Presicci A Ventura P Maria Bacca S Iliceto G Medicamento N Buttiglione M Perniola T 《Journal of child neurology》2006,21(12):1085-1090
Diagnosis of neurofibromatosis 1 is based on clinical criteria. In a large number of children with neurofibromatosis 1, magnetic resonance imaging (MRI) reveals high-signal T(2)-weighted intensities in different brain regions, defined as unidentified bright objects. These lesions are asymptomatic; most of them regress spontaneously with age, but the presence of contrast enhancement or mass effect in them usually strongly suggests an increased risk of proliferative changes. To date, few studies have focused on evoked potentials in patients with neurofibromatosis 1, and the reported abnormalities did not have significant clinical correlations. We describe the clinical and instrumental (MRI and evoked potentials) follow-up of three patients with neurofibromatosis 1. MRI and evoked potentials showed subclinical involvement of the central nervous system. Some MRI T(2)-weighted hyperintensities showed enhancement and mass effect of uncertain significance. During follow-up, the MRI lesions spontaneously decreased in size or enhancement, allowing us to exclude the hypothesis of proliferative lesions; in the same way, some asymptomatic evoked potential abnormalities disappeared. These findings suggest that both MRI and evoked potentials could be useful in the detection and monitoring of cerebral complications of neurofibromatosis 1. 相似文献
67.
Mesquita-Ferrari RA Martins MD Silva JA da Silva TD Piovesan RF Pavesi VC Bussadori SK Fernandes KP 《Lasers in medical science》2011,26(3):335-340
The aim of the present study was to determine the effect of low-level laser therapy (LLLT) on the expression of TNF-α and
TGF-β in the tibialis anterior muscle of rats following cryoinjury. Muscle regeneration involves cell proliferation, migration
and differentiation and is regulated by growth factors and cytokines. A growing body of evidence suggests that LLLT promotes
skeletal muscle regeneration by reducing the duration of acute inflammation and accelerating tissue repair. Adult male Wistar
rats (n = 35) were randomly divided into three groups: control group (no lesion, untreated, n = 5), cryoinjury without LLLT group (n = 15), and cryoinjury with LLLT group (n = 15). The injured region was irradiated three times a week using an AlGaInP laser (660 nm; beam spot 0.04 cm2, output power 20 mW, power density 500 mW/cm2, energy density 5 J/cm2, exposure time 10 s). Muscle remodeling was evaluated at 1, 7 and 14 days (long-term) following injury. The muscles were
removed and total RNA was isolated using TRIzol reagent and cDNA synthesis. Real-time polymerase chain reactions were performed
using TNF-α and TGF-β primers; GAPDH was used to normalize the data. LLLT caused a decrease in TNF-α mRNA expression at 1
and 7 days following injury and in TGF-β mRNA expression at 7 days following cryoinjury in comparison to the control group.
LLLT modulated cytokine expression during short-term muscle remodeling, inducing a decrease in TNF-α and TGF-β. 相似文献
68.
Lombardi CP Raffaelli M D'alatri L De Crea C Marchese MR Maccora D Paludetti G Bellantone R 《World journal of surgery》2008,32(5):693-700
Background Voice and swallowing symptoms are frequently reported after thyroidectomy even in absence of objective voice alterations.
We evaluated the influence of the video-assisted approach on voice and swallowing outcome of thyroidectomy.
Methods Sixty-five patients undergoing total thyroidectomy (TT) were recruited. Eligibility criteria were: nodule size ≤30 mm, thyroid
volume ≤30 ml, no previous neck surgery. Exclusion criteria were: younger than aged 18 years and older than aged 75 years,
vocal fold paralysis, history of voice, laryngeal or pulmonary diseases, malignancy other than papillary thyroid carcinoma.
Patients were randomized for video-assisted (VAT) or conventional (CT) thyroidectomy. Videostrobolaryngoscopy (VSL), acoustic
voice analysis (AVA), and maximum phonation time (MPT) evaluation were performed preoperatively and 3 months after TT. Subjective
evaluation of voice (voice impairment score = VIS) and swallowing (swallowing impairment score = SIS) were obtained preoperatively,
1 week, 1 month, and 3 months after TT.
Results Fifty-three patients completed the postoperative evaluation: 29 in the VAT group, and 24 in the CT group. No laryngeal nerves
injury was shown at postoperative VSL. Mean postoperative MPT, F
0, F
low, F
high, and the number of semitones were significantly reduced in the CT group but not in the VAT group. Mean VIS 3 months after
surgery was significantly higher than preoperatively in CT group but not in the VAT group. Mean SIS was significantly decreased
1 and 3 months after VAT but not after CT.
Conclusions The incidence and the severity of early voice and swallowing postthyroidectomy symptoms are significantly reduced in patients
who undergo VAT compared with conventional surgery.
Presented at the ISW2007—IAES free paper session, Montreal, Canada, August 26–30, 2007. 相似文献
69.
Malignant Pleural Mesothelioma is a rare tumour that arise from the mesothelial cells of the pleura and in recent time the incidence of this disease is rising. Because of the implications for management and therapy, it is important to assess the accurate staging. 18F-fluorodeoxiglucose Positron Emission Tomography (18F-FDG PET) is become a useful tool in the diagnosis of many neoplasms, such as Malignant Pleural Mesothelioma. In particular it has been shown to be useful in the evaluation of the extent of pleural disease, in the establishment of lymph node involvement, in the evaluation of tumour invasion into the lung and thoracic wall, in the diagnosis of extrathoracic metastases, in the assessment of the response to treatment, and in planning radiotherapy. Developments in system technology, like improvements in hybrid system (integrated Positron Emission Tomography/Computed Tomography) and the discovery of new radiopharmaceuticals, promise to make PET much more useful and versatile in the future. 相似文献
70.
O'Neill PJ Parks BG Walsh R Simmons LM Miller SD 《The Journal of bone and joint surgery. American volume》2007,89(5):979-986
BACKGROUND: Traction is presumed to be the mechanism of injury to the superficial peroneal nerve in an inversion ankle sprain, but it is not known whether the amount of strain caused by nerve traction is sufficient to cause nerve injury. We hypothesized that the superficial peroneal nerve would experience significant excursion and strain during a simulated inversion sprain, that sectioning of the anterior talofibular ligament would increase excursion and strain, and that an impact force would produce strain in a range that can structurally alter the nerve. METHODS: Differential reluctance transducers were placed in the superficial peroneal nerve in sixteen lower-extremity cadaver specimens to measure excursion and strain in situ. Static weight was applied to the foot in increments starting at 0.454 kg and ending at 4.54 kg. The anterior talofibular ligament was sectioned, and the measurements were repeated. A final impact force of 4.54 kg was applied to each specimen. Two-way repeated-measures analysis of variance was used to evaluate differences in excursion and strain. RESULTS: The mean excursion and strain of the superficial peroneal nerve increased with increases in the applied weight in both the group with the intact anterior talofibular ligament and the group in which it had been sectioned. Nerve excursion was greater in the sectioned-ligament group than in the intact-ligament group with all applied weights (p < 0.05). The mean nerve strain was greater in the sectioned-ligament group (range, 5.5% to 12.9%) than in the intact-ligament group (range, 3.0% to 11.6%) with application of the 0.454, 0.908, 1.362, and 1.816-kg weights (p < 0.05). With the ligament sectioned, the 4.54-kg impact force produced significantly higher mean nerve excursion and strain than did the 4.54-kg static weight (p < 0.05). CONCLUSIONS: The magnitude of strain with the impact force was in the lower range of values that have been shown to structurally alter peripheral nerves. The superficial peroneal nerve is at risk for traction injury during an ankle inversion sprain and is at additional risk with more severe sprains or with an insufficient anterior talofibular ligament. 相似文献