全文获取类型
收费全文 | 343篇 |
免费 | 19篇 |
国内免费 | 4篇 |
专业分类
儿科学 | 11篇 |
妇产科学 | 15篇 |
基础医学 | 36篇 |
口腔科学 | 2篇 |
临床医学 | 15篇 |
内科学 | 92篇 |
皮肤病学 | 2篇 |
神经病学 | 34篇 |
特种医学 | 10篇 |
外科学 | 87篇 |
综合类 | 2篇 |
预防医学 | 9篇 |
眼科学 | 5篇 |
药学 | 19篇 |
中国医学 | 1篇 |
肿瘤学 | 26篇 |
出版年
2023年 | 2篇 |
2022年 | 10篇 |
2021年 | 10篇 |
2020年 | 11篇 |
2019年 | 12篇 |
2018年 | 11篇 |
2017年 | 16篇 |
2016年 | 16篇 |
2015年 | 9篇 |
2014年 | 12篇 |
2013年 | 24篇 |
2012年 | 40篇 |
2011年 | 41篇 |
2010年 | 23篇 |
2009年 | 19篇 |
2008年 | 24篇 |
2007年 | 16篇 |
2006年 | 10篇 |
2005年 | 18篇 |
2004年 | 16篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 2篇 |
1999年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1924年 | 1篇 |
排序方式: 共有366条查询结果,搜索用时 0 毫秒
41.
Effects of acute and chronic administration of the melanocortin agonist MTII in mice with diet-induced obesity 总被引:8,自引:0,他引:8
High-fat diet-induced obesity (DIO) in rodents is associated with hyperleptinemia and resistance to leptin, but the response to agents acting downstream of leptin receptors remains unknown. We assessed the response of mice with DIO to treatment with MTII, an alpha-melanocyte-stimulating hormone analog. MTII delivered four times daily by intraperitoneal injection to C57BL/6J mice produced a dose-responsive effect on food intake, body weight, leptin, corticosterone, insulin, and free fatty acids. In DIO mice, administration of MTII 100 microg q.i.d. i.p. markedly suppressed feeding during the first 4 days of treatment, with food intake returning to control levels at day 5. Progressive weight loss also occurred over the first 4 days, after which weight plateaued at a level below control. After 8 days of treatment, MTII-treated DIO mice had major suppression of both leptin and insulin levels. Central administration of MTII for 4 days (10 nmol/day) in DIO mice significantly suppressed food intake, induced weight loss, and increased energy expenditure. These results indicate that 1) MTII administration to DIO mice causes suppression of food intake and body weight loss, and decreased food intake is primarily responsible for weight loss; 2) peripheral MTII improves insulin resistance in DIO mice; 3) "tachyphylaxis" to the effect of chronic MTII treatment on food intake occurs; and 4) at least some of the effects of MTII are exerted centrally. In conclusion, treatment with a melanocortin agonist is a promising therapeutic approach to DIO and associated insulin resistance. 相似文献
42.
Gabriele Jovtchev Svetla Gateva Mila Stergios Stanislava Kulekova 《Environmental toxicology》2010,25(3):294-303
Two phylogenetically distant types of test‐systems—root tip meristems of barley (Hordeum vulgare) and human lymphocytes in vitro were used to detect genotoxicity and cytotoxicity induced by the herbicide paraquat (PQ) in the concentration range (10?6 to 5 × 10?4 mol/l). As an endpoint for cytotoxicity the mitotic index (MI) was evaluated. The frequency of chromosome aberrations (CA) and the frequency of micronuclei (MN) were used as endpoints for genotoxicity. A dose‐dependent increase of CA and MN was observed in both test systems, although the values for PQ‐induced MN were somewhat lower. The increase of the genotoxic effect corresponds to a decrease of mitotic activity. The structurally reconstructed barley karyotype MK14/2034 allowed the allocation of the PQ‐specific features of aberration distribution patterns and gave information about which chromosome segments in different chromosomal positions were involved in induced aberrations. Paraquat produced preferably isochromatid breaks and “aberration hot spots” in a restricted number of heterochromatin‐containing segments. The comparative analysis of susceptibility in the used test‐systems to PQ with respect to its cytotoxic and clastogenic effect showed that the human lymphocytes were more sensitive than Hordeum vulgare. © 2009 Wiley Periodicals, Inc. Environ Toxicol, 2010. 相似文献
43.
Mitchell B. Berger Stergios K. Doumouchtsis John O. DeLancey 《International urogynecology journal》2013,24(8):1377-1383
Introduction and hypothesis
Bony pelvis dimensions have been shown to differ in women with and without pelvic floor dysfunction. The goal of this study was to determine whether bony pelvis dimensions are different when comparing women with severe bilateral levator ani defects (LAD) with those with normal muscles.Methods
This is a secondary analysis of a case–control study comparing women with and those without pelvic organ prolapse. Subjects underwent pelvic organ prolapse quantification (POP-Q) examination and were classified as either having prolapse or being normal. All underwent pelvic magnetic resonance imaging (MRI). Levator defects were assessed based on the muscles’ appearance on imaging and subjects were stratified into two groups—women with normal muscles (n?=?99) and women with severe bilateral LAD (n?=?50). Bony pelvis dimensions were measured via MRI pelvimetry. The subpubic angle, interspinous and intertuberous diameters, and the sacrococcygeal joint-to-infrapubic point (SCIPP) lengths were compared.Results
Both groups had similar demographics. The SCIPP length was 2.5 % (3 mm) shorter in women with severe LAD than in those without defects (P?=?0.02). The SCIPP measured 4 % (5 mm) less in women with prolapse and severe LAD than in subjects with prolapse but normal muscles (P?=?0.01). Logistic regression identified SCIPP length and history of forceps delivery as being independent predictors of severe bilateral LAD.Conclusions
Severe bilateral LAD are associated with shorter SCIPP length and forceps-assisted vaginal delivery. 相似文献44.
45.
46.
47.
Summary Pediatric high grade gliomas represent a heterogeneous group of tumors with poor prognoses despite the use of multimodal treatment.
Very little progress has been made over the past decades in identifying efficacious therapeutic modalities against both high
grade gliomas and diffuse brainstem gliomas in children. The degree of surgical resection is the most important clinical prognostic
factor for children with high grade gliomas, and a complete resection should be attempted whenever feasible. The role of radiation
therapy in the treatment of older children with high grade gliomas and diffuse brain stem gliomas is undisputed; however the
benefit of using radiation for patients less than 6 years of age (with high grade gliomas) might be questionable. Despite
the absence of solid evidence to support its use, chemotherapy is routinely used against these tumors. Currently temozolomide
is being investigated due to its activity in adult trials and based on preliminary data regarding recurrent disease. A small
subgroup of patients can be successfully treated with high dose chemotherapy followed by autologous stem cell rescue. Early
trials using this modality in the past had been associated with high morbidity and mortality. High dose chemotherapy with
autologous stem cell rescue in selected patients with minimal residual disease, angiogenesis inhibitors, radiosensitizers
and other biological modifiers are being currently investigated in phase I/II trials. 相似文献
48.
Sourlas L Papadakis M Lallos S Brilakis E Efstathopoulos N 《Journal of long-term effects of medical implants》2011,21(3):193-196
Intramedullary interlocking nailing is the gold standard method for treatment of tibial shaft fractures. Thus, the growing use of the intramedullary nailing resulted in an increased number of tibial nails removal procedures in daily clinical practice. Despite adequate surgeon experience, the removal of tibial intramedullary nails is not without complications. One of the commonly used nails is the ACE (DePuy Orthopaedics, Inc., Warsaw, IN, USA). The purpose of this paper is to report such a complication following the removal procedure and review the pertinent literature. A 39-year-old female who had sustained a lower-third tibial fracture was treated with an intramedullary nail 5 years ago. Despite her unremarkable follow-up, for personal reasons, a removal procedure was planned. Two undisplaced fractures were observed in the postoperative radiological evaluation. The potential complications of the removal of intramedullary nailing of the tibia should be considered by both physician and patient. 相似文献
49.
Natassa Pippa Faidra Psarommati Stergios Pispas Costas Demetzos 《Pharmaceutical research》2013,30(9):2385-2395
Purpose
Fractal analysis was used as a tool in order to study the morphological characteristics of PEGylated liposomes. We report on the morphological characteristics of stealth liposomes composed of DPPC and DPPE-PEG 3000 in two dispersion media using fractal analysis.Methods
Light scattering techniques were used in order to elucidate the size, the morphology and the surface charge of PEGylated liposomes as a function of PEGylated lipid concentration and temperature. Fluorescence spectroscopy studies revealed a microenvironment of low polarity inside the liposomal membranes.Results
All formulations were found to retain their physicochemical characteristics for at least 3 weeks. The hydrodynamic radii (Rh) of stealth liposomes were stable in the process of heating up to 50°C; while the fractal dimension values (df) which correspond to their morphology, have been changed during heating. Hence, these results are a first indication of the presence of a heterogeneous microdomain structure of the stealth liposomal system. The amphiphilic drug indomethacin (IND) was successfully encapsulated within the liposomes and led to an increased size of stealth liposomes, while the morphology of liposomal vectors changed significantly at the highest molar ratio of PEGylated lipid.Conclusions
We can state that this approach can promote a new analytical concept based on the morphological characteristics and quantify the shape of drug carriers complementary to that of the conventional analytical techniques. 相似文献50.
Konstantinos T. Tsaousis Panagiotis G. Karagiannidis Nikolaos Kopsachilis Chrysanthos Symeonidis Ioannis T. Tsinopoulos Varvara Karagkiozaki Lampros P. Lamprogiannis Stergios Logothetidis 《International ophthalmology》2014,34(3):519-523
The purpose of the study was to appraise the effect of loading force magnitude on the determination of the elastic modulus of the anterior lens capsule through atomic force microscopy. Four human anterior lens capsules taken during phacoemulsification cataract surgery were studied, free of epithelial cells, with atomic force microscopy. For the experiment, five different indentation loading forces were applied to near areas of the specimen. Experimental data was exported and analyzed according to the Hertz model to obtain the Young’s modulus with regards to the elastic behavior of the material. Force–distance curves were acquired by applying a load of 2, 5, 10, 20 and 30 nN. When examining the results it was evident that determination of Young’s modulus of the anterior lens capsule is dependent on the loading force concerning the examined range. Loading forces of 10 and 20 nN led to results without significant difference (p > 0.05) and more reproducible (coefficients of variation 12.4 and 11.7 %, respectively). 相似文献