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Exploring the Acetone Evaporation and Airborne Neurotoxicity Bioassay against Adult Mosquito in the Enclosed Environment of Peet Grady Chamber 封闭环境中丙酮蒸发及空气对成蚊神经毒性生物测定的探讨
Pub Date : 2018-08-21 DOI: 10.14203/JKTI.V20I1.378
J. Kamaldin, Z. Jaal
Mosquito has comprehensive and sensitive olfactory neuro-sensory located at antenna utilized for detecting airborne organic compounds in search of blood host. Mosquito is also known to have similar neurotransmitters function with human at neural synapses e.g. acetylcholinesterase, esterases and oxidases enzymes. Thus, there is potential use mosquito in predicting neurotoxicity of exogenic volatile organic compounds (VOC) e.g. manufactured acetone. Hence, the study evaluates the suitability to conduct bioassay of VOC neurotoxicity against mosquito in Peet Grady chamber that is commonly used for insecticidal bioassay. Acetone as the representative of VOC is easily evaporized at laboratory temperature of 26 to 29 °C without heating. The acetone evaporation profile on liquid surface and porous solid surface under the Peet Grady chamber is studied to ascertain the consistency of vaporization rate with homogenized distribution. The study showed the acetone has shown consistent vaporization rate of 23 mg/min from liquid surface and 116.3 mg/min from porous surface (filter paper) without heating, in a linear regression of very high positive correlation (r = 1.000) between time and mass of acetone vaporized. However, the non-homogenized distribution of acetone vapours in the Peet Grady chamber directly affected the accuracy to elucidate the neurotoxicity bioassay against mosquito in term of mosquito knockdown. The study suggests the positioning of mosquitoes in the Peet Grady chamber should be lower than the point of acetone vaporization, whereby the mosquitoes are knockdown by acetone vapours within the 20th minute upon reaching concentration of 170.3 to 196.1 ppm.
蚊子具有全面灵敏的嗅觉神经,位于触角上,用于探测空气中的有机化合物,寻找血液宿主。蚊子在神经突触上也具有与人类相似的神经递质功能,如乙酰胆碱酯酶、酯酶和氧化酶。因此,蚊子在预测外源性挥发性有机化合物(VOC)如人造丙酮的神经毒性方面具有潜在的应用价值。因此,本研究评价了在常用的杀虫生物测定方法Peet Grady室中进行VOC对蚊子神经毒性生物测定的适宜性。丙酮作为挥发性有机化合物的代表,在实验室温度为26 ~ 29℃时,不需加热,极易蒸发。研究了在Peet Grady实验室内丙酮在液体表面和多孔固体表面的蒸发分布,以确定蒸发速率与均匀分布的一致性。研究表明,在不加热的情况下,丙酮在液体表面的蒸发速率为23 mg/min,在多孔表面(滤纸)的蒸发速率为116.3 mg/min,蒸发时间与丙酮的质量呈高度正相关(r = 1.000)的线性回归。然而,丙酮蒸气在Peet Grady实验室内的不均匀分布直接影响了从灭蚊角度阐明对蚊子神经毒性生物测定的准确性。研究建议,Peet Grady室中蚊子的位置应低于丙酮汽化点,即当丙酮的浓度达到170.3 ~ 196.1 ppm时,蚊子在20分钟内被丙酮蒸气杀死。
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引用次数: 1
The Evaluation of Substrates and Trichoderma sp. Isolates for Cellulase Production 产纤维素酶底物及木霉分离物的评价
Pub Date : 2018-08-21 DOI: 10.14203/JKTI.V20I1.384
E. Triwahyuni, Y. Aristiawan, Novita Ariani, H. Abimanyu, T. Anindyawati
AbstractAs higher interest was on the lignocellulose-based or second generation bioethanol production, the research was then more focused on the production of cellulase, especially on the domestic enzyme. Trichoderma sp. is considered as one of the most efficient producer of cellulase. This study was conducted to investigate the performance of Trichoderma sp. on a variety of substrates to produce cellulase. Three types of substrate variations and three types of Trichoderma sp. were used in this experiment. The substrate used were wheat bran, rice bran and oil palm empty fruit bunches (EFBs), whereas Trichoderma sp. isolates were encoded as T004, T051 and T063. Production of cellulase was made by solid fermentation for 7 days. The analysis of cellulase activity was done by National Renewable Energy Laboratory (NREL) method for filter paper assay. The results showed that the type of substrate affected the performance of Trichoderma sp. All types of fungus produced cellulase on wheat bran substrate with activity of 0.52 FPU /ml for T004, 0.23 FPU/ml for T051 and 0.27 FPU /ml for T063. With the rice bran substrate and EFBs, only T004 could produce cellulase and the enzyme activity analyzed were 0.08 FPU /ml and 0.008 FPU/ml respectively. Optimation of the buffer addition on enzyme extraction process produces the highest activity 0.85 FPU/mL for T004 with wheat bran substrate. Keywords: cellulase, EFBs, rice bran , Trichoderma sp. , wheat bran
摘要随着人们对木质纤维素或第二代生物乙醇生产的兴趣日益浓厚,对纤维素酶的生产,尤其是国产酶的研究也越来越集中。木霉被认为是最有效的纤维素酶的生产者之一。本研究探讨了木霉在不同底物上生产纤维素酶的性能。本实验采用三种底物变化和三种木霉。以麦麸、米糠和油棕空果束为底物,分离木霉编码为T004、T051和T063。采用固体发酵法制备纤维素酶7 d。纤维素酶活性分析采用美国国家可再生能源实验室(NREL)滤纸法。结果表明:底物类型对木霉的产酶性能有一定影响,所有真菌对麦麸底物的产酶活性分别为:T004 0.52 FPU/ml、T051 0.23 FPU/ml、T063 0.27 FPU/ml。在米糠底物和EFBs中,只有T004能产生纤维素酶,酶活性分别为0.08 FPU/ml和0.008 FPU/ml。经优化后,以麦麸为底物的T004酶提取率最高,为0.85 FPU/mL。关键词:纤维素酶,EFBs,米糠,木霉,麦麸
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引用次数: 2
Analysis of Learning Problems in Chemistry at Eria Medan Private High School 棉兰私立高中化学学习问题分析
Pub Date : 2018-08-21 DOI: 10.14203/JKTI.V20I1.377
Rafika Utami
AbstractThe purpose of this study was to determine the learning process and to analyze the problem of learning chemistry in senior high school. The approach used in this study was a qualitative approach. This mini research was conducted at Eria Medan Private Senior High School in 2017. Research subjects were selected by purposive sampling of 35 Mathematic and Natural Science 1, students grade XI. Data were collected and recorded using observation sheet to measure teacher activities. Students responses were obtained using a questionnaire. The result identified some problems that may inhibit the learning process. Only 37,14 % students were happy to complete or practice with questions and 42.85% of students are actively involved in the learning process. In addition, 80% of students stated that the chemistry books used were less interesting and only 20% of students stated their chemistry book was interesting to read.This study also found that there are misconceptions in teaching concept in the subject of chemical equilibrium.
摘要本研究的目的是确定高中化学学习过程,分析高中化学学习存在的问题。本研究采用的方法是定性方法。这项小型研究于2017年在埃里亚棉兰私立高中进行。选取数学与自然科学1年级35名学生进行有目的抽样。采用观察表对教师活动进行数据收集和记录。学生的回答是通过问卷调查获得的。结果发现了一些可能阻碍学习过程的问题。只有37.14%的学生乐于完成或练习问题,42.85%的学生积极参与学习过程。此外,80%的学生表示使用的化学书不那么有趣,只有20%的学生表示他们的化学书读起来很有趣。本研究还发现,化学平衡课的教学观念存在误区。
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引用次数: 0
Preparation and Characterization of Polyhedral Octaphenylsilsesquioxane Modified Castor oil based Polyurethane 多面体八苯基硅氧烷改性蓖麻油基聚氨酯的制备与表征
Pub Date : 2018-08-21 DOI: 10.14203/jkti.v20i1.375
Y. Wen, P. Jiang, Jieh-Ming Huang, A. Haryono, Jianneng Deng, Zhiliang Cao
Vegetable oil-based polyurethanes were synthesized using castor oil (CO) as feedstock, which were characterized by their environmental friendly and renewable properties. Aiming to compensate for shortcomings of these materials, a series of polyurethane/polyhedral octaphenylsilsesquioxane (OPS) hybrids with different OPS contents were prepared by physical mixing in the solutions. Thereafter?chemical structure?morphology and thermal properties of hybrids were characterized through Fourier transform infrared spectrometer (FTIR), scanning electron microscope (SEM), differential scanning calorimetry (DSC), thermal gravimetric analyzer (TGA), tensile test techniques and static contact angle. The results show that the hybrid polyurethanes display both enhanced glass transition temperatures (Tg), initial decomposition temperature (Td5) and tensile strength with low OPS contents. While with high contents?these values decline with the severe aggregation of nano-particles as shown in the SEM images. Meanwhile, the hybrid polyurethanes displayed enhanced surface hydrophobicity as the contact angle with water revealed
以蓖麻油(CO)为原料合成了环保型、可再生的植物油基聚氨酯。为了弥补这些材料的不足,在溶液中通过物理混合制备了一系列不同OPS含量的聚氨酯/多面体八苯基硅氧烷(OPS)杂合物。之后呢?化学结构?通过傅里叶红外光谱仪(FTIR)、扫描电镜(SEM)、差示扫描量热仪(DSC)、热重分析仪(TGA)、拉伸测试技术和静态接触角等手段对复合材料的形貌和热性能进行了表征。结果表明:低OPS含量的杂化聚氨酯具有较高的玻璃化转变温度(Tg)、初始分解温度(Td5)和抗拉强度;而高含量的呢?这些值随着纳米颗粒的严重聚集而下降,如SEM图像所示。与此同时,杂化聚氨酯与水的接触角表现出增强的表面疏水性
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引用次数: 0
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Jurnal Kimia Terapan Indonesia
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