scholarly journals Toxicological Properties of Artificial Pyrethroid Cypermethrin

2020 ◽  
pp. 1-3
Keyword(s):  
Chemical Industry ◽  
External Environment ◽  
Rapid Decay ◽  
Veterinary Practice ◽  
Chemical Agents ◽  
The Difference

The difference between artificial pyrethroid preparations from other chemical agents is that they selectively affect pests, and also cause rapid decay in the external environment, which is less toxic to hot dogs. One of the representatives of this group is the drug cypermethrin, which is produced in our own chemical industry, in particular at the Navoi electrochemical plant, and is used in veterinary practice.

Studies Concerning the Corrosion Behaviour of the Cast Stainless Steel Used for Chemical Industry

2013 ◽  
Vol 371 ◽  
pp. 338-342
Author(s):  
Gheorghe Simionescu ◽  
Mirela Gheorghian
Keyword(s):  
Chemical Industry ◽  
Room Temperature ◽  
Corrosion Behaviour ◽  
Research Work ◽  
Experimental Tests ◽  
Hot Environment ◽  
Chemical Agents ◽  
The Subject ◽  
Materials Used ◽  
Cast Stainless Steel

The current work deals with experimental tests concerning the behaviour of different materials used in chemical industry when are exposed to diverse corrosions environments. During the research work four different metals have been tested, namely T15NiCr180, T15MoNiCr180, W4027 and W4059. The presented work is trying to classify the tested materials function to different chemical environment, different concentration of the environment, different temperature of the environment, and different expose time. Some of the substances which were considered as corrosion environment are: HNO3, H3PO4, NaCl, NH4Cl, C2H5OH, Petrol, NH4NO3, KNO3, K2CO3, Na2CO3, KMnO4, KOH and Ca (OH)2. The concentration of the corrosion solutions varies between 1% and 96%. Tests have been done at room temperature and hot environment of 100°C. Time is playing an important role on evolution of the corrosion. For this reason the samples have been analyzed after 48, 336, 720 and 2160 hours of exposes to chemical agents. To understand the comportment of the subject metals when are used in industry, samples have been tested for longer period of time, respectively 1, 3, 6 and 12 months. After each selected period of time the metallic samples were analyzed and measured to quantify the effect of the environment on the corrosion speed.

THE ALTERATION OF INTRACELLULAR ENZYMES: IV. KINETICS OF CATALASE ALTERATION INDUCED BY CHEMICAL AGENTS

1956 ◽  
Vol 34 (1) ◽  
pp. 25-38
Author(s):  
J. Gordin Kaplan ◽  
Woon-Ki Paik
Keyword(s):  
Molecular Level ◽  
Narrow Range ◽  
Intact Cell ◽  
Cellular Level ◽  
Causal Connection ◽  
Rate Limiting Step ◽  
Chemical Agents ◽  
The Difference ◽  
Rate Limiting ◽  
Kinetics Of

The rate with which n-butanol alters the properties of yeast catalase has been studied as a function of temperature and concentration of altering agent. Activation energies for catalase alteration lay within the rather narrow range of 20–23 kcal./mole, thus confirming a prediction made previously on the basis of the difference in energies of activation for heat destruction of altered and unaltered catalases. Alteration by optimal concentration of butanol was a reaction of zero order. Chloroform also altered yeast catalase with an activation energy within this range of μ values. The close agreement in μ values leads us to conclude that the action of these two altering agents, at all concentrations, is characterized by the same rate-limiting step, even though their action differs in other respects. It was concluded that catalase alteration is probably all-or-none on the molecular level, rather than on the cellular level. Alteration was invariably accompanied by a decrease in the size of the treated cells; alteration was sometimes accompanied by changes in the cytochrome spectrum, but there was no causal connection between these two events. These data are consistent with the interfacial hypothesis, which, in its present crude form, pictures alteration as consisting essentially in the desorption of catalase from some intracellular interface at which it is normally bound in the intact cell.

scholarly journals Simultaneous Synthesis of Vitamins D2, D4, D5, D6, and D7 from Commercially Available Phytosterol, β-Sitosterol, and Identification of Each Vitamin D by HSQC NMR

Metabolites ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 107
Author(s):  
Shiro Komba ◽  
Eiichi Kotake-Nara ◽  
Wakako Tsuzuki
Keyword(s):  
Vitamin D ◽  
Vitamin D3 ◽  
Chemical Industry ◽  
Chemical Shifts ◽  
Vitamin D Analogs ◽  
Vitamin D Analog ◽  
Simultaneous Synthesis ◽  
The Difference ◽  
Pure Cholesterol ◽  
Tokyo Chemical Industry

We succeeded in simultaneously synthesizing the vitamin D family, vitamins D2, D4, D5, D6, and D7, from β-sitosterol, which is sold as a commercially available reagent from Tokyo Chemical Industry Co., Ltd. It is officially sold as a mixture of four phytosterols {β-sitosterol (40–45%), campesterol (20–30%), stigmasterol, and brassicasterol}. Owing to this, we anticipated that, using this reagent, various vitamin D analogs could be synthesized simultaneously. We also synthesized vitamin D3 from pure cholesterol and analyzed and compared all vitamin D analogs (D2, D3, D4, D5, D6, and D7) by HSQC NMR. We succeeded in clearly demonstrating the difference in the NMR chemical shifts for each vitamin D analog.

Experimental investigation for reverse heat transfer in structural fire-protective clothing

2016 ◽  
Vol 88 (5) ◽  
pp. 577-585
Author(s):  
Duck Weon Lee ◽  
Joon-Hyung Jin ◽  
Eunae Kim ◽  
Junghan Lee
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Thermal Effects ◽  
Protective Clothing ◽  
External Environment ◽  
Air Permeability ◽  
Outer Shell ◽  
Structural Fire ◽  
Multilayered Systems ◽  
The Difference

Structural fire-protective clothing must be effective at minimizing the thermal effects of fire. However, water remaining on the outer shell might play an important role in conducting heat transfer, which causes skin burns in a firefighter when he douses a fire with water through a hose. Therefore, this research demonstrated the difference in the heat transfer and humidity created by the remaining water or lack of water on the outer shell under a condition in which the temperature (45 ± 1℃) of the external environment was higher than that of the skin. Two types of multilayered systems, which simulated real fire-protective clothing (outer shell, moisture barrier, thermal liner) were tested by using a human–clothing–environment (HCE) simulator. The experimental results verified that water on the outer shell increased the microclimate temperature in the structural fire-protective clothing. In particular, we assume that air permeability in the outer shell can be an important factor to control heat and mass transfer within the microclimate.

scholarly journals The Relationship between the Morphology and Elasticity of Natural Rubber Foam Based on the Concentration of the Chemical Blowing Agent

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1091
Author(s):  
Supitta Suethao ◽  
Saree Phongphanphanee ◽  
Jirasak Wong-ekkabut ◽  
Wirasak Smitthipong
Keyword(s):  
Mechanical Properties ◽  
Morphological Structure ◽  
Morphological Properties ◽  
Heterogeneous Structure ◽  
Compression Force ◽  
Soft Or ◽  
Blowing Agent ◽  
Chemical Agents ◽  
The Difference ◽  
The Relationship

Concentrated natural latex was used to produce a rubber foam that is porous, elastic and well ventilated. The mechanical properties can be either soft or firm, depending on the formulation of the latex used. Briefly, concentrated natural latex was mixed with chemical agents to make the rubber foam on a laboratory scale using the Dunlop process. In this work, we changed the concentration of the chemical blowing agent in the latex. The morphological properties of the rubber foam were characterised using scanning electron microscopy, and the mechanical properties, or elasticity, were studied using compression experiments and the Mooney–Rivlin calculation. The results show that the concentration of the chemical blowing agent affects the morphological properties of the rubber foam but not the mechanical properties, indicating the heterogeneous structure of the rubber foam. The thermodynamic parameters (∆G and ∆S) and the internal energy force per compression force (Fu/F) of the rubber foam with various amounts of chemical blowing agent were also investigated. This study could be applied in the foam industry, particularly for pillow, mattress and insulation materials, as the present work shows the possible novel control of the morphological structure of the rubber foam without changing its mechanical properties. The difference in cell sizes could affect the airflow in rubber foam.

Chemical process wastewater treatment by attached cultures under anoxic conditions

1994 ◽  
Vol 29 (10-11) ◽  
pp. 417-422 ◽  
Author(s):  
B. Delanghe ◽  
J. Roussy ◽  
E. Guibal ◽  
P. Le Cloirec
Keyword(s):  
Organic Carbon ◽  
Chemical Industry ◽  
Pilot Plant ◽  
Degradation Kinetics ◽  
Toc Removal ◽  
Nitrate Consumption ◽  
Attached Bacteria ◽  
The Difference ◽  
Process Wastewater ◽  
Industry Wastewater

The anoxic biodegradation of organic carbon in industrial wastewaters was studied on pilot plants with attached bacteria. The process involved submerged granular filters with expanded glass balls as packing material. The two wastewaters which were investigated came from a wine-produce industry and a chemical industry. The nitrate requirements were studied on a semi-batch pilot plant. The nitrate consumption was found to be about 0.7 - 0.9 g N-NO3·g−1TOC for the organic carbon removal from the wine-produce industry wastewater. The influence of the volumetric load, Cv, on the Total Organic Carbon (TOC) removal was studied on a continuous-flow pilot plant. High removal yields of 90 % and more were obtained with volumetric loads up to 2 kg TOC.m−3.d−1 with the wine-produce industry wastewater. However 80 % TOC removal was obtained for a maximum volumetric load of 0.2 kg TOC.m−3.d−1 with the chemical industry wastewater. The difference between the two wastewaters might be due to the different degradation kinetics and/or biodegradability of their organic compounds. Nitrite concentrations were negligible throughout the study.

Pulp composition and the invasion and decay of fruits by microbes

1988 ◽  
Vol 66 (6) ◽  
pp. 1068-1072
Author(s):  
Victoria A. Borowicz
Keyword(s):  
Linear Model ◽  
Fungal Spores ◽  
Exponential Model ◽  
Fat Content ◽  
Sterile Water ◽  
Rapid Decay ◽  
Microbial Invasion ◽  
Sterile Needle ◽  
Cornus Amomum ◽  
The Difference

Among temperate-zone plant species, fruits with fat-rich pulp have been predicted to disappear more rapidly than low-fat fruits, in part because of more rapid decay by microbes. The influence of fat content of pulp on the susceptibility of fruits to microbial invasion and the rate of pulp deterioration after invasion were examined using Cornus amomum fruits (approximately 5.8% crude fat) and C. racemosa fruits (approximately 23.1% crude fat). Fruits were surface sterilized, punctured with a sterile needle or left undamaged, and inoculated with sterile water, a suspension of bacteria, or a suspension of fungal spores. The two species did not differ significantly in the number of days to first deterioration (= susceptibility), but whole C amomum fruits deteriorated faster than did whole C. racemosa fruits after invasion was first visible. This difference between species persisted when the difference in mean dry pulp mass was taken into account using an exponential model of pulp decay. The two Cornus species did not differ in rate of pulp deterioration (milligrams dry tissue per day) when a linear model of microbial decay of pulp was used. In these two species, higher fat content of pulp does not yield greater susceptibility to invasion or higher rate of deterioration by microbes.

The Diamond Approach to the Competitiveness of Korea's Defense Industry

2010 ◽  
Vol 11 (2) ◽  
pp. 69-111
Author(s):  
Hee-Jung Moon
Keyword(s):  
Chemical Industry ◽  
External Environment ◽  
Defense Industry ◽  
Government Support ◽  
Extensive Literature ◽  
Short Period ◽  
Literature Reviews ◽  
Drastic Increase ◽  
New Framework

Despite the control of U.S. and poor domestic infrastructures, the Korean defense industry has been advanced at relatively faster trajectory owing to the multiple circumstantial factors such as technocrats, drastic increase of scientists, efficient interrelationship with the heavy chemical industry, and systematic government support. reasons. Changes in the internal and external environment are calling for strategic developments of a new framework for competitive factors. The purpose of this study is to explore what constitutes could be achieved effectively in a relatively short period of time. This l framework to evaluate competitiveness of the defense industry in a more comprehensive and strategic way. Along with this model, this study uses mainly extensive literature reviews due to limitations in reliable examples of successful firms and interviews with field practitioners in the Korean defense industry.

scholarly journals Attacks on IoT devices for power consumption

2021 ◽  
Vol XXIV (1) ◽  
pp. 111-116
Author(s):  
BÎRLEANU S.
Keyword(s):  
Smart Cities ◽  
External Environment ◽  
The Internet ◽  
Sensors And Actuators ◽  
Daily Lives ◽  
The Difference ◽  
Iot Devices ◽  
Levels Of Service ◽  
The Internet Of Things ◽  
Exchange Data

The Internet of Things (IoT) is a network of physical objects that contain electronics embedded in their architecture to communicate and feel the interactions between them or with the external environment. In the coming years, IoT-based technology will provide advanced levels of service and will virtually change the way people live their daily lives. Advances in medicine, engineering, business, agriculture, smart cities and smart homes are just some of the categorical examples in which the IoT is strongly established. In other words, IoT is the connection of any device (from mobile phones, vehicles, appliances and other embedded elements with sensors and actuators) to the Internet, so that these objects can exchange data with each other in a network. It is interesting to note that the difference between IoT and the Internet is the absence of human role.

THE ALTERATION OF INTRACELLULAR ENZYMES: IV. KINETICS OF CATALASE ALTERATION INDUCED BY CHEMICAL AGENTS

1956 ◽  
Vol 34 (1) ◽  
pp. 25-38 ◽  
Author(s):  
J. Gordin Kaplan ◽  
Woon-Ki Paik
Keyword(s):  
Molecular Level ◽  
Narrow Range ◽  
Intact Cell ◽  
Cellular Level ◽  
Causal Connection ◽  
Rate Limiting Step ◽  
Chemical Agents ◽  
The Difference ◽  
Rate Limiting ◽  
Kinetics Of

The rate with which n-butanol alters the properties of yeast catalase has been studied as a function of temperature and concentration of altering agent. Activation energies for catalase alteration lay within the rather narrow range of 20–23 kcal./mole, thus confirming a prediction made previously on the basis of the difference in energies of activation for heat destruction of altered and unaltered catalases. Alteration by optimal concentration of butanol was a reaction of zero order. Chloroform also altered yeast catalase with an activation energy within this range of μ values. The close agreement in μ values leads us to conclude that the action of these two altering agents, at all concentrations, is characterized by the same rate-limiting step, even though their action differs in other respects. It was concluded that catalase alteration is probably all-or-none on the molecular level, rather than on the cellular level. Alteration was invariably accompanied by a decrease in the size of the treated cells; alteration was sometimes accompanied by changes in the cytochrome spectrum, but there was no causal connection between these two events. These data are consistent with the interfacial hypothesis, which, in its present crude form, pictures alteration as consisting essentially in the desorption of catalase from some intracellular interface at which it is normally bound in the intact cell.

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