This experimental investigation aims at evaluating the thermal properties of rice husk ash (RHA)—filled gypsum plaster composite for potential applications, as insulating materials. The thermal conductivities of comp...This experimental investigation aims at evaluating the thermal properties of rice husk ash (RHA)—filled gypsum plaster composite for potential applications, as insulating materials. The thermal conductivities of composites of gypsum plaster reinforced with RHA at 0%, 10%, 20%, 30%, and 40% volume fractions were determined experimentally using Lee’s disc method. The experimental results show that integrating RHA reduces the thermal conductivity of gypsum plaster and improves its insulation capacity. The results obtained from the experiments were compared with the Rule of Mixture Model, Maxwell Model, and Russell Model. It was observed that the thermal conductivities obtained from experiments and the theoretical models decreased with an increase in the volume fraction of RHA. The errors associated with the models with respect to experimental results are on the average of 28.7% for Mixture Rule, 31.6% for Russel Model, and 18.8% for the Maxwell Model. An agricultural waste like RHA can be beneficially used for the preparation of composites and, due to improved insulation capability, these composites can be used for applications such as insulation boards and sheathing, hardboard, ceilings of roofs, decorations, etc.展开更多
Objective:To evaluate the antimicrobial activity of Actinomycetes species isolated from marine environment.Methods:Twenty one strains of Actinomyceteswere isolated from samples of Royapuram, Muttukadu, Mahabalipuram s...Objective:To evaluate the antimicrobial activity of Actinomycetes species isolated from marine environment.Methods:Twenty one strains of Actinomyceteswere isolated from samples of Royapuram, Muttukadu, Mahabalipuram sea shores and Adyar estuary. Preliminary screening was done using cross-streak method against two gram-positive and eight gram-negative bacteria.The most potent strains C11 and C12 were selected from which antibacterial substances were extracted. The antibacterial activities of the extracts were performed using Kirby-Bauer disc diffusion method. Molecular identification of those isolates was done.Results:All those twenty one isolates were active against at least one of the test organisms. Morphological characters were recorded. C11 showed activity againstStaphylococcusspecies(13.0暲0.5 mm),Vibrio harveyi(11.0暲0.2 mm),Pseudomonas species(12.0暲0.3 mm). C12 showed activity against Staphylococcus species(16.0暲0.4 mm),Bacillus subtilis(11.0暲0.2 mm),Vibrio harveyi(9.0暲0.1 mm),Pseudomonas species(10.0暲0.2 mm). 16S rRNA pattern strongly suggested that C11 and C12 strains were Streptomyces species.Conclusions:The results of the present investigation reveal that the marineActinomycetesfrom coastal environment are the potent source of novel antibiotics.Isolation, characterization and study of Actinom ycetescan be useful in discovery of novel species of Actinomy cetes.展开更多
目的:探讨薛氏三步调衡法治疗腰椎间盘突出症的临床疗效。方法:根据随机数字表法将90例腰椎间盘突出症患者分成观察组和对照组。对照组给予常规推拿治疗,观察组则给予薛氏三步调衡法治疗。比较两组腰椎间盘突出症患者临床疗效、症状改...目的:探讨薛氏三步调衡法治疗腰椎间盘突出症的临床疗效。方法:根据随机数字表法将90例腰椎间盘突出症患者分成观察组和对照组。对照组给予常规推拿治疗,观察组则给予薛氏三步调衡法治疗。比较两组腰椎间盘突出症患者临床疗效、症状改善时间、活动障碍解除时间、疼痛消失时间;治疗前后患者日本骨科协会评估治疗评分(Japanese orthopaedic association scores,JOA)、日常生活能力(activities of daily living,ADL)评分、生存质量健康调查简表(the MOS item short from health survey,SF-36)评分和疼痛评分;不良反应发生率。结果:观察组腰椎间盘突出症干预有效率显著高于对照组(P<0.05);观察组症状改善时间、活动障碍解除时间、疼痛消失时间显著优于对照组(P<0.05);治疗后观察组JOA评分、ADL评分、SF-36评分和疼痛评分显著优于对照组(P<0.05)。两组均无严重不良反应发生。结论:薛氏三步调衡法治疗腰椎间盘突出症效果确切,可有效改善症状,缓解疼痛,促进腰椎功能改善和活动能力提高,改善患者生存质量,安全有效。展开更多
文摘This experimental investigation aims at evaluating the thermal properties of rice husk ash (RHA)—filled gypsum plaster composite for potential applications, as insulating materials. The thermal conductivities of composites of gypsum plaster reinforced with RHA at 0%, 10%, 20%, 30%, and 40% volume fractions were determined experimentally using Lee’s disc method. The experimental results show that integrating RHA reduces the thermal conductivity of gypsum plaster and improves its insulation capacity. The results obtained from the experiments were compared with the Rule of Mixture Model, Maxwell Model, and Russell Model. It was observed that the thermal conductivities obtained from experiments and the theoretical models decreased with an increase in the volume fraction of RHA. The errors associated with the models with respect to experimental results are on the average of 28.7% for Mixture Rule, 31.6% for Russel Model, and 18.8% for the Maxwell Model. An agricultural waste like RHA can be beneficially used for the preparation of composites and, due to improved insulation capability, these composites can be used for applications such as insulation boards and sheathing, hardboard, ceilings of roofs, decorations, etc.
文摘Objective:To evaluate the antimicrobial activity of Actinomycetes species isolated from marine environment.Methods:Twenty one strains of Actinomyceteswere isolated from samples of Royapuram, Muttukadu, Mahabalipuram sea shores and Adyar estuary. Preliminary screening was done using cross-streak method against two gram-positive and eight gram-negative bacteria.The most potent strains C11 and C12 were selected from which antibacterial substances were extracted. The antibacterial activities of the extracts were performed using Kirby-Bauer disc diffusion method. Molecular identification of those isolates was done.Results:All those twenty one isolates were active against at least one of the test organisms. Morphological characters were recorded. C11 showed activity againstStaphylococcusspecies(13.0暲0.5 mm),Vibrio harveyi(11.0暲0.2 mm),Pseudomonas species(12.0暲0.3 mm). C12 showed activity against Staphylococcus species(16.0暲0.4 mm),Bacillus subtilis(11.0暲0.2 mm),Vibrio harveyi(9.0暲0.1 mm),Pseudomonas species(10.0暲0.2 mm). 16S rRNA pattern strongly suggested that C11 and C12 strains were Streptomyces species.Conclusions:The results of the present investigation reveal that the marineActinomycetesfrom coastal environment are the potent source of novel antibiotics.Isolation, characterization and study of Actinom ycetescan be useful in discovery of novel species of Actinomy cetes.
文摘目的:探讨薛氏三步调衡法治疗腰椎间盘突出症的临床疗效。方法:根据随机数字表法将90例腰椎间盘突出症患者分成观察组和对照组。对照组给予常规推拿治疗,观察组则给予薛氏三步调衡法治疗。比较两组腰椎间盘突出症患者临床疗效、症状改善时间、活动障碍解除时间、疼痛消失时间;治疗前后患者日本骨科协会评估治疗评分(Japanese orthopaedic association scores,JOA)、日常生活能力(activities of daily living,ADL)评分、生存质量健康调查简表(the MOS item short from health survey,SF-36)评分和疼痛评分;不良反应发生率。结果:观察组腰椎间盘突出症干预有效率显著高于对照组(P<0.05);观察组症状改善时间、活动障碍解除时间、疼痛消失时间显著优于对照组(P<0.05);治疗后观察组JOA评分、ADL评分、SF-36评分和疼痛评分显著优于对照组(P<0.05)。两组均无严重不良反应发生。结论:薛氏三步调衡法治疗腰椎间盘突出症效果确切,可有效改善症状,缓解疼痛,促进腰椎功能改善和活动能力提高,改善患者生存质量,安全有效。
