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排序方式: 共有52条查询结果,搜索用时 46 毫秒
1.
Nastaran Zoghi Mohamad Hassan Fouani Hamed Bagheri Maryam Nikkhah Nasibe Asadi 《应用聚合物科学杂志》2021,138(32):50781
Wound care has been a challenging subject for medical teams and researchers. Bacterial infections are one of the most serious complications in injured skins that often affect healing process. Antibacterial wound dressings can be used to facilitate wound healing process. The purpose of this study is to fabricate chitosan (Chito)/polyethylene glycol (PEG) antibacterial wound dressing doped with minocycline, and to evaluate the influence of composition ratio on the blending properties of the films. To improve the mechanical properties of these films, we examined various amounts of glycerol as a plasticizer. Moreover, we investigated morphological and mechanical aspects, water uptake, degradation, water vapor transmission and wettability properties of the films prepared with various ratios of Chito/PEG/Gly. Assessment of mechanical properties revealed that film containing 80:20 ratio Chito/PEG with 40 PHR Gly content exhibits the highest ultimate tensile strength and elongation at break (9.74 MPa and 45.73% respectively). Furthermore, results demonstrated that upon increasing PEG and Gly contents, degradability and hydrophilicity of the films increased whereas water uptake decreased. Water vapor transmission rate of the films was close to the range of 530–1200 g/m2d, indicating that the as formed films are possible candidates for dressing low exudate wounds or burns. Minocycline loaded films exhibited a biphasic drug release profile and it was more effective on gram-positive bacteria than on gram-negative bacteria. The polymeric film with the highest amount of loaded drug (2%) exhibited insignificant cytotoxicity (88%) against normal fibroblast cell line. 相似文献
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Giuseppe Donato Mangano Malak Fouani Daniela DAmico Valentina Di Felice Rosario Barone 《International journal of molecular sciences》2022,23(6)
Cachexia is a multifactorial and multi-organ syndrome that is a major cause of morbidity and mortality in late-stage chronic diseases. The main clinical features of cancer-related cachexia are chronic inflammation, wasting of skeletal muscle and adipose tissue, insulin resistance, anorexia, and impaired myogenesis. A multimodal treatment has been suggested to approach the multifactorial genesis of cachexia. In this context, physical exercise has been found to have a general effect on maintaining homeostasis in a healthy life, involving multiple organs and their metabolism. The purpose of this review is to present the evidence for the relationship between inflammatory cytokines, skeletal muscle, and fat metabolism and the potential role of exercise training in breaking the vicious circle of this impaired tissue cross-talk. Due to the wide-ranging effects of exercise training, from the body to the behavior and cognition of the individual, it seems to be able to improve the quality of life in this syndrome. Therefore, studying the molecular effects of physical exercise could provide important information about the interactions between organs and the systemic mediators involved in the overall homeostasis of the body. 相似文献
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The distributions of plasma total cholesterol and triglyceride levels as well as plasma lipoprotein abnormalities were studied
in 50 Egyptian males aged 20–69 years. Total cholesterol increased gradually with advancing age up to the seventh decade.
In contrast, triglycerides peaked in the fifth decade, then declined. Type IV lipoprotein pattern was the most common abnormality
(12%). Type II was less common (2.0%). Types I, III and V were not encountered. The mean plasma triglyceride and cholesterol
levels were not markedly different from similar studies done on non-Arab populations. The high incidence of hyperlipidemia
among this group is worth noting, especially in the search for the coronary-prone, since all of the type IV group had normal
total cholesterol levels. 相似文献
6.
Hassan Artail Abdelkarim Ajami Tania Saouma Malak Charaf 《Wireless Communications and Mobile Computing》2016,16(14):1956-1971
This paper presents a faulty node detection approach for wireless sensor networks that aggregate measurement data on their way toward the sink (base station). The approach is based on the idea of commanding sensor nodes on the aggregation paths to temporarily stop including their readings in the received aggregated readings from their upstream neighbors. The scheme is dependent on the ability of the sink to detect faulty nodes through changes in the received aggregated readings at the sink using a Markov Chain Controller (MCC). The algorithm that is run in the sink uses the MCC to assign a state to each sensor node based on transitions that are triggered by receiving aggregated path readings, and accordingly deduces the nodes that may be faulty. The experimental results show at least 98% detection rate at the cost of reasonable detection delays and generated wireless network traffic. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Rehan Ullah Malak Azmat Ali G. Murtaza Asif Mahmood Shahid M. Ramay 《国际能源研究杂志》2020,44(13):10179-10191
The structural, electronic, magnetic, optical and thermoelectric properties of anti-fluorite Cs2NbI6 were investigated using full potential augmented plane wave method of density functional theory. Structurally, Cs2NbI6 was found to be cubic in ground state from values of tolerance factor (1.04) and formation energy (−22.3 eV). While, it's ferromagnetic nature was predicted from volume optimization process. In spin down channel, the compound was explored as indirect band gap (Eg(Γ-X) = 1.97 eV) semiconductor, while it changes to metallic in upper spin channel. Nb-d and I-p states were exposed as the main cause of spin dependent electronic nature (half-metallicity). The origin of magnetism in Cs2NbI6 was explained on basis of crystal field theory. The calculated magnetic moment (1.001 μB) was found in reasonable agreement with experimental value. The optimum absorption and optical conductivity spectra in semiconductor state explored Cs2NbI6 as suitable for optoelectronic devices. Furthermore, the transport properties were calculated using BoltzTrap code. The nature of carriers was predicted as n type from negative values of Seebeck coefficients. Where, the figure of merit (ZT) was found to increase up to 0.85 at 900 K. The present work not only explores Cs2NbI6 as potential optoelectronic and thermoelectric material, but can also inspire more experimental research on this important compound. 相似文献
9.
J Malak 《Canadian Metallurgical Quarterly》1998,4(2):131-132
We detail the case history of a patient with Stage I seminoma, who developed an elevated level of human chorionic gonadotrophin (hCG) while on follow-up. It transpired that the patient had injected himself with hCG several days before. This type of abuse has been documented, but this is the first reported case of it interfering with the follow-up of a patient with a germ cell tumour. 相似文献
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The performance of a proposed porous electric heater is investigated. The porous heater exchanges heat with the working fluid through its large volumetric surface area. As a result, it produces lower surface temperature as compared with the conventional heater for the same imposed heating power. Two mathematical models are presented to describe the thermal behavior of both heaters and the predictions of both models are compared at different operating conditions. 相似文献