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Effect of lysozyme subphase and insertion on several lipid films 溶菌酶亚相及插入对几种脂质膜的影响
Pub Date : 2019-06-01 DOI: 10.15761/ams.1000149
J. Torrent-Burgués, R. Raju
The influence of proteins on lipid monolayers is a subject of biological interest. In this work the influence of lysozyme on lipid films of stearic acid, oleic acid, cholesterol, DPPC and POPC has been studied. The Langmuir monolayer technique, using surface pressure-area isotherms and elastic modulus plots, as well as protein insertion experiments in lipid monolayers, have been used. Results indicate that lysozyme affects the lipid monolayer formation, the elastic modulus and, sometimes, the physical state of the monolayer. This influence is more important till moderate surface pressures. At high surface pressures and near the physiological value of lateral pressure of 33 mN/m, there is expulsion of lysozyme out of the monolayer. This expulsion is more important for stearic acid, DPPC and POPC. The lower value of maximum insertion pressure is for stearic acid and the higher one is for oleic acid. The relation between the initial and the increased surface pressure in insertion experiments has been analysed
蛋白质对脂质单分子层的影响是生物学研究的一个重要课题。本文研究了溶菌酶对硬脂酸、油酸、胆固醇、DPPC和POPC脂膜的影响。Langmuir单层技术,使用表面压力-面积等温线和弹性模量图,以及脂质单层中的蛋白质插入实验,已经被使用。结果表明,溶菌酶影响脂质单分子层的形成、弹性模量,有时还影响脂质单分子层的物理状态。这种影响在地表压力适中之前更为重要。在高表面压力和接近33 mN/m侧压力的生理值时,溶菌酶会从单层中排出。这种排出对硬脂酸、DPPC和POPC更为重要。硬脂酸的最大插入压力较低,油酸的最大插入压力较高。分析了插入试验中初始表面压力与增加表面压力之间的关系
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引用次数: 18
Nano-materials as anode electrocatalysts for microbial fuel cells 纳米材料作为微生物燃料电池阳极电催化剂
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000156
Weishan Li
Recent progresses made in our laboratory on nano-materials as electrocatalysts for microbial fuel cells are summarized in this review. Compared to the cathode electrocatalysts for oxygen reduction reaction, which are similar to those used for other fuel cells such as proton exchange membrane fuel cells, our interest is mainly focused on the anode electrocatalysts with the aim to accelerate the charge transfer process on anodes. Various nano-materials have been developed in our laboratory as anode electrocatalysts, based on the concept that the charge transfer kinetics between anode and substrates is highly dependent of the bio-compatibility that favors the formation of biofilm on anode, and electrocatalytic activities towards the oxidation reactions of the redox couples in bacteria and the intermediates fermented by bacteria. *Correspondence to: Weishan Li, National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES (Ministry of Education), and Key Lab. of ETESPG(GHEI), South China Normal University, Guangzhou 510006, China, Email: liwsh@scnu.edu.cn
本文综述了近年来本实验室在纳米材料作为微生物燃料电池电催化剂方面的研究进展。与用于氧还原反应的阴极电催化剂(与质子交换膜燃料电池等其他燃料电池类似)相比,我们的兴趣主要集中在阳极电催化剂上,目的是加速阳极上的电荷转移过程。基于阳极和底物之间的电荷转移动力学高度依赖于有利于在阳极上形成生物膜的生物相容性,以及对细菌氧化还原偶对和细菌发酵的中间体的氧化反应的电催化活性的概念,我们实验室开发了各种纳米材料作为阳极电催化剂。*通信对象:李伟山,高能与安全lib中MPTES国家与地方联合工程研究中心,MTEES教育部工程研究中心,重点实验室。华南师范大学环境科学与技术研究所,广东广州510006,电子邮件:liwsh@scnu.edu.cn
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引用次数: 1
Formation of branched structure of polyimide macromolecules in the temperatures range below the onset of the thermal destruction 形成支链结构的聚酰亚胺大分子在温度范围以下开始热破坏
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000150
V. Svetlichnyi, I. Gofman, A. Didenko, Elena Vlasova
The film samples of poly-[4,4'-bis(4"-N-phenoxy)biphenyl-sulfone]imide1,3-bis(3',4-dicarboxyphenoxy)benzene obtained both by two-step synthesis and by onestep high temperature synthesis in N-methyl-2-pyrrolidone solution were used to study the formation of the interchain crosslinks in this soluble polyimide in the temperature range of 250-300°C. Just in this region a final stage of the thermal treatment of different polyimide materials takes place during their processing. A possible crosslink formation mechanism has been put forward to present the adequate explanation of the experimental data obtained in the work. A simple technological way is offered to avoid the unfavourable effect above. *Correspondence to: Iosif Gofman, Institute of Macromolecular Compounds, Russian Academy of Sciences, 31, Bol’shoi str. (V.O.), St. Petersburg, 199004, Russia, Tel: +7(812)328-8511; E-mail: gofman@imc.macro.ru
用在n -甲基-2-吡啶酮溶液中两步合成和一步高温合成的聚-[4,4′-双(4′- n -苯氧基)联苯砜]亚胺1,3-双(3′,4-二羟基苯氧基)苯薄膜样品,研究了该可溶性聚酰亚胺在250 ~ 300℃温度范围内链间交联的形成。就在这个区域,不同的聚酰亚胺材料在加工过程中进行最后阶段的热处理。提出了一种可能的交联形成机制,以充分解释工作中获得的实验数据。为避免上述不利影响,提出了一种简单的工艺方法。*通信:Iosif Gofman,大分子化合物研究所,俄罗斯科学院,31,Bol 'shoi str. (V.O.),圣彼得堡,199004,俄罗斯,电话:+7(812)328-8511;电子邮件:gofman@imc.macro.ru
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引用次数: 0
Effect of gabapentin on postoperative pain control after a cesarean delivery: a pilot randomized controlled trial 加巴喷丁对剖宫产术后疼痛控制的影响:一项随机对照试验
Pub Date : 1900-01-01 DOI: 10.15761/jaa.1000121
Tienne Randolf, Cindy A Evrard, Harini Gurram, David M Haas, Amy Dorwart, Nicole Ngo
Background: Opioid dependence has risen dramatically and is becoming more common in pregnant women. Finding adjunct methods to reduce the need for postoperative opioid pain medications is needed. The objective of this pilot trial was to evaluate if administration of gabapentin after cesarean delivery would decrease postoperative opiate requirements and pain scores. Methods: This was a pilot, triple-blind, placebo-controlled, randomized trial. Women undergoing a non-emergent repeat cesarean delivery who only planned to bottle feed The primary outcome was opiate consumption in the acute postoperative period. pain that were converted to morphine equivalents for statistical analysis. The secondary outcomes assessed included pain scores and events.
背景:阿片类药物依赖急剧上升,并且在孕妇中变得越来越普遍。需要寻找辅助方法来减少术后阿片类止痛药的需求。本试验的目的是评估剖宫产后给予加巴喷丁是否会减少术后阿片类药物的需求和疼痛评分。方法:这是一项先导、三盲、安慰剂对照、随机试验。非紧急重复剖宫产的妇女只计划用奶瓶喂养,主要结局是术后急性期阿片类药物的消耗。将疼痛转化为吗啡当量用于统计分析。评估的次要结果包括疼痛评分和事件。
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引用次数: 0
Application of horse-derived placental peptides in cosmetics 马源胎盘肽在化妆品中的应用
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000151
K. Wakame, A. Nakata, Keisuke Sato, K. Komatsu, T. Maruta
The placenta is a tissue mass formed in the uterus. It is an indispensable organ that is responsible for the transportation of blood required for fetal growth. Horse placenta has been used in the health food and cosmetic fields in recent years. We enzymatically treated horse placenta and obtained placental peptides with molecular weights < 3,000 Da. We mainly performed the in vitro experiments using human fibroblasts. We confirmed that placental peptides primarily activate the mitochondria of human fibroblasts and promote the production of type I collagen. Therefore, we suggest the use of placental peptides as materials that contribute to the improvement of skin elasticity and reduction of wrinkles in the cosmetic field. *Correspondence to: Koji Wakame, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 15-4-1,Maeda 7-jo, Teine-ku, Sapporo-shi, Hokkaido 006-0085, Japan, Tel: +81(11) 676 8682; Fax: +81 (11) 676 8666; E-mail: wakame-k@hus.ac.jp
胎盘是在子宫内形成的组织块。它是一个不可或缺的器官,负责输送胎儿生长所需的血液。近年来,马胎盘被广泛应用于保健食品和化妆品领域。我们对马胎盘进行酶处理,得到分子量< 3000 Da的胎盘肽。我们主要使用人成纤维细胞进行体外实验。我们证实胎盘肽主要激活人成纤维细胞的线粒体并促进I型胶原的产生。因此,我们建议在化妆品领域使用胎盘肽作为有助于改善皮肤弹性和减少皱纹的材料。*通讯:北海道理科大学医学部若ame浩司,日本北海道006-0085札幌市天区前田7-jo, 15-4-1,电话:+81(11)676 8682;传真:+81 (11)676 8666;电子邮件:wakame-k@hus.ac.jp
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引用次数: 1
Physical, mechanical, thermal and morphological analysis of date palm mat (DPM) and palmyra palm fruit (PPF) fiber reinforced high density polyethylene hybrid composites 枣棕榈垫(DPM)和棕榈果(PPF)纤维增强高密度聚乙烯杂化复合材料的物理、力学、热及形态分析
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000153
Afroza Khatun M, S. S, Parvin Nur H, Sarwaruddin Chowdhury AM
In this work, date palm mat (DPM) and palmyra palm fruit (PPF) fibers were incorporated to high density polyethylene (HDPE) for the fabrication of hybrid composites. The composites were prepared by compression molding at different weight % (5, 10, 15, 20 and 25 wt %) of fiber contents. Physical, mechanical and soil degradation properties were studied. Thermal properties, scanning electron microscopy (SEM) and Fourier-transform infrared (FT-IR) analysis of the 100% HDPE and hybrid composites were also done. The results from experiments indicate that the properties of the hybrid composites at 5% fiber content are better than 100% HDPE.
在这项工作中,将椰枣垫(DPM)和棕榈果(PPF)纤维掺入高密度聚乙烯(HDPE)中制备杂化复合材料。采用不同重量%(5%、10%、15%、20%和25%重量%)的压缩成型方法制备复合材料。研究了土壤的物理、机械和降解特性。对100% HDPE及其复合材料的热性能、扫描电镜(SEM)和傅里叶变换红外(FT-IR)进行了分析。实验结果表明,5%纤维含量的混杂复合材料性能优于100% HDPE。
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引用次数: 5
Converting the langmuir trough into an interfacial rheometer 将朗缪尔槽转换成界面流变仪
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000146
Ernesto Javier Grasso
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引用次数: 0
Preparation, characterization, and application in water purification of g-C3N4/I-TiO2 composite photocatalysts g-C3N4/I-TiO2复合光催化剂的制备、表征及其在水净化中的应用
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000148
Mohammed Q Alfaifi, Abdulaziz A Bagabas
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引用次数: 1
Development and characterization of new XLPE compounds for high performance cables in the automotive industry 用于汽车行业高性能电缆的新型XLPE化合物的开发和表征
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000152
J. Rompante, A. Vieira, F. Amaral, Pinedo Aa, J. Goncalves, E. Oliveira, Conceição Ds
The materials employed in the electrical insulation of cables/wires used in the automotive industry are exposed to several external factors that may affect the overall performance of the system. These factors include mechanical vibrations, high temperature, humidity, wind and rain. In order to have a stable and trustworthy solution, these materials need to follow specific criteria in what regards their abrasion, thermal and chemical resistance, flame retardancy, and mechanical properties. In this work, new crosslinked polyethylene (XLPE) compounds were developed by means of compound extrusion, using peroxide crosslinking, and also different polymeric matrices. Ultimately, blends of ethylene-vinyl-acetate (EVA) and low density polyethylene (LDPE) with alumina trihydrate (ATH) and magnesium hydroxide (MH), exhibited a significant increase in both the oxidation-induction time – higher than 95 min (OIT), and abrasion resistance (sandpaper abrasion) – approximately 38.1 g, while maintaining a low density profile and fair mechanical properties, when compared with the selected standard material, based on a ATH-additivated EVA material. These findings show that such material can be considered as a promising and suitable candidate for high performance cables.
汽车工业中使用的电缆/电线的电气绝缘材料暴露于几个可能影响系统整体性能的外部因素中。这些因素包括机械振动、高温、湿度、风和雨。为了获得稳定可靠的解决方案,这些材料需要在耐磨性、耐热性和耐化学性、阻燃性和机械性能方面遵循特定的标准。本文通过复合挤出、过氧化物交联和不同聚合物基体制备了新型交联聚乙烯(XLPE)化合物。最终,乙烯-乙烯-乙酸酯(EVA)和低密度聚乙烯(LDPE)与三水合氧化铝(ATH)和氢氧化镁(MH)的共混物在氧化诱导时间(超过95分钟)和耐磨性(砂纸磨损)(约38.1 g)方面都有显著增加,同时保持了低密度轮廓和良好的机械性能,与选择的标准材料相比,基于ATH添加的EVA材料。这些发现表明,这种材料可以被认为是一种有前途的和合适的高性能电缆候选材料。
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引用次数: 0
An unpresented approach to ameliorate swine waste contamination 一种未提出的改善猪粪污染的方法
Pub Date : 1900-01-01 DOI: 10.15761/ams.1000158
W. C. Chen, T. Yeh
Piggery waste is one the tree major water pollution sources in Taiwan. Piggery waste should be viewed as resource and not waste. Conventionally, three stage wastewater treatments are too costly and hard to operate. Direct application to soil can be a remedy if the application rate is careful managed. Generally, wastewater from the piggery industry is treated in three stages: liquid solid separation, anaerobic digestion and then aerobic treatment. However, this process is difficult due to high cost and difficult operation. Therefore, a feasible method was to establish a centralized methane production facility for the treatment of piggery industrial waste. The products after treated like methane and fertilize are utilized as clean and environmentally friendly products. Methane can be used for cooking or electricity generation. This is a new direction suitable for sustainable development. Three stage piggery waste water treatment including soil liquid separation, anaerobic digestion and then aerobic treatment which is not well received and popular due to costly and difficult operation in Taiwan. Particularly, the anaerobic component is always a headache. Taiwan EPA ambitiously launches piggery manure direct apply to soil policy. It might the panacea to water pollution control. The feasible approach is to set a centralized methane production facility to purify, electricity as well as heat generation, and gay for motor. With the major pollutants such as odors, BOD, TN and TS, waste from the piggery industry has been seriously affecting the environment in Taiwan. However, if this amount of waste is properly treated, it will bring great benefits and can be considered as a resource.
养猪场废弃物是台湾三大水污染来源之一。养猪场废物应被视为资源,而不是废物。传统上,三级污水处理成本过高且难以操作。如果施用量适当,直接施用于土壤是一种补救措施。一般来说,养猪业废水的处理分为三个阶段:液固分离、厌氧消化和好氧处理。但该工艺成本高,操作难度大,难度大。因此,建立集中式产甲烷装置处理养猪业废弃物是可行的方法。经甲烷和肥料处理后的产品作为清洁环保产品利用。甲烷可用于烹饪或发电。这是适合可持续发展的新方向。猪舍废水三级处理,包括土液分离、厌氧消化、好氧处理,但由于成本高、操作难度大,在台湾尚未普及。特别是,无氧成分总是令人头痛。台湾环保署雄心勃勃地推出猪粪直接应用于土壤的政策。它可能是控制水污染的灵丹妙药。可行的方法是设置一个集中的甲烷生产设备进行净化、发电和供热,并为电机提供动力。养猪业废弃物以恶臭、BOD、TN、TS等为主要污染物,严重影响台湾的环境。然而,如果这些废物得到适当的处理,它将带来巨大的效益,可以被认为是一种资源。
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引用次数: 1
期刊
Advanced Material Science
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