scholarly journals Imparting biocidal properties to insulating materials made of linen fibres

2021 ◽  
pp. 32-37
Author(s):  
A. M. Yertas ◽  
A. Burkitbay ◽  
B. Zh. Niyazbekov ◽  
B. R. Taussarova
Keyword(s):  
Heat Treatment ◽  
Salicylic Acid ◽  
Copper Sulfate ◽  
Antimicrobial Agents ◽  
Fungicidal Activity ◽  
Insulating Materials ◽  
Nonwoven Materials ◽  
Finishing Process ◽  
Material Tests ◽  
Biocidal Properties

In this work, salicylic acid and copper sulfate were chosen as antimicrobial agents to impart biocidal properties to nonwoven materials. The conditions of the antibacterial finishing process were as follows: the aqueous solution of a biocidal composition of different concentration was applied by spraying to the surface of the material, then the drying and heat treatment was carried out at 180°C on the thermal conductor. A microbiological study was conducted to study the fungicidal activity of the treated material. Tests were also carried out on the toxic and dermal effects of non-woven material treated with salicylic acid and copper sulfate and demonstrated its safety to human health.

Investigation of Heat Treated Electrodeposited CoNiFe on Microstructure and Hardness

2015 ◽  
Vol 1113 ◽  
pp. 56-61
Author(s):  
Nor Azrina Resali ◽  
Koay Mei Hyie ◽  
M.N. Berhan ◽  
C.M. Mardziah
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Crystallographic Structure ◽  
Face Centered Cubic ◽  
Heat Treated ◽  
Hardness Property ◽  
Finishing Process ◽  
The Face ◽  
Face Centered

In this research, heat treatment is the final finishing process applied on nanocrystalline CoNiFe to improve microstructure for good hardness property. Nanocrystalline CoNiFe has been synthesized using the electrodeposition method. This study investigated the effect of heat treatment at 500°C, 600°C, 700°C and 800°C on electrodeposited nanocrystalline CoNiFe. The heat treatment process was performed in the tube furnace with flowing Argon gas. By changing the heat treatment temperature, physical properties such as phase and crystallographic structure, surface morphology, grain size and hardness of nanocrystalline CoNiFe was studied. The nanocrystalline CoNiFe phase revealed the Face Centered Cubic (FCC) and Body Centered Cubic (BCC) crystal structure. FESEM micrographs showed that the grain sizes of the coatings were in the range of 78.76 nm to 132 nm. Dendrite shape was found in the microstructure of nanocrystalline CoNiFe. The nanocrystalline CoNiFe prepared in heat treatment temperature of 700°C, achieved the highest hardness of 449 HVN. The surface roughness of nanocrystalline CoNiFe heated at 700°C was found to be smaller than other temperatures.

scholarly journals Design, synthesis and fungicidal activity of isothiazole–thiazole derivatives

RSC Advances ◽  
2018 ◽  
Vol 8 (69) ◽  
pp. 39593-39601 ◽  
Author(s):  
Qi-Fan Wu ◽  
Bin Zhao ◽  
Zhi-Jin Fan ◽  
Jia-Bao Zhao ◽  
Xiao-Feng Guo ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Systemic Acquired Resistance ◽  
Fungicidal Activity ◽  
Acquired Resistance ◽  
Thiazole Derivatives ◽  
Design Synthesis ◽  
Salicylic Acid Pathway ◽  
Acid Pathway

Compound 6u exhibits ultrahigh fungicidal activity by acting at its potent target PcORP1 and induces systemic acquired resistance by activating the salicylic acid pathway.

scholarly journals Antimicrobial Activity of Nanoencapsulated Essential Oils of Tasmannia lanceolata, Backhousia citriodora and Syzygium anisatum against Weak-Acid Resistant Zygosaccharomyces bailii in Clear Apple Juice

Beverages ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 67
Author(s):  
Fahad Alderees ◽  
Saleha Akter ◽  
Ram Mereddy ◽  
Yasmina Sultanbawa
Keyword(s):  
Essential Oils ◽  
Apple Juice ◽  
Antimicrobial Agents ◽  
Fungicidal Activity ◽  
Weak Acid ◽  
Life Extension ◽  
Zygosaccharomyces Bailii ◽  
Beverage Industry ◽  
Oil In Water ◽  
Leaf Oil

The anti-yeast activity of oil-in-water encapsulated nanoemulsion containing individual or a combination of the three essential oils of Tasmanian pepper leaf (Tasmannia lanceolata), lemon myrtle (Backhousia citriodora), and anise myrtle (Syzygium anisatum) against weak-acid resistant Zygosaccharomyces bailii in clear apple juice was investigated. The effectiveness of the shelf-life extension of Z. bailii-spiked (1 × 103 CFU/mL) clear apple juice was evaluated and compared between natural (essential oils) and synthetic (sodium benzoate) antimicrobial agents. Essential oils showed an immediate reduction in the Z. bailii cell population at day-0 and exerted a fungicidal activity at day-4 of storage, with no further noticeable growth at the end of the experiment (day-28). At lower concentrations, Tasmanian pepper leaf oil of 0.0025% had >6 log CFU/mL at day-12 of storage. For lemon myrtle essential oils, the yeast population reached >6 log CFU/mL at day-24 and day-20 for concentrations of 0.02% and 0.01%, respectively. The fungicidal activity of Tasmanian pepper leaf oil reduced from 0.005% to 0.0025% v/v when mixed at a ratio of 1:1 with anise myrtle oil. The results of the present study suggest that these three native Australian herbs have the potential to be used in the beverage industry by controlling Zygosaccharomyces bailii in clear apple juice products.

scholarly journals OPTIMIZATION OF THE PROCESS OF HEAT TREATMENT OF POROUS THERMAL INSULATING MATERIAL IN A VORTEX APPARATUS BY MECHANICAL PROPERTIES

2021 ◽  
Vol 2 (37) ◽  
pp. 55-58
Author(s):  
I. Sokolovska ◽  
K. Chumak
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mathematical Model ◽  
Porous Material ◽  
Thermal Processing ◽  
Thermal Exposure ◽  
Thermal Mode ◽  
Insulating Materials ◽  
The Given ◽  
External Loads

The paper provides experimental data, on the basis of which the influence of various factors on the strength characteristics of porous heat-insulating materials was studied. A mathematical model of the process of heat treatment of a porous material was also proposed, with the help of which its properties can be predicted. The field of application of heat-insulating materials directly depends on the thermophysical and mechanical properties of the material itself, which are also interconnected. Mechanical properties determine the behavior of a material under deformation and destruction from external loads and under thermal stress. To reveal the influence of the characteristics of thermal processing modes on the mechanical properties of the processed material, a mathematical model of the process of thermal processing of a porous material was built in the given work. The elastic modulus and strength of the material were taken as process indicators characterizing the behavior of the material during deformation and destruction due to external loads, and the temperature of the thermal process, the time of thermal exposure, the moisture content of the material and the porosity of the material were taken as factors characterizing the thermal processing mode. The point forecast of indicators according to the received models for the given thermal mode of processing of porous material made: value of the modulus of elasticity is equal to 0,413, value of durability of material on compression is equal to 0,056. The work revealed that the main factor that determines the strength of the heat-insulating porous material is the duration of thermal exposure. It is obvious that it is this factor that determines the intensity of heat and mass transfer processes in the material, which is interconnected with the main technological indicator – the temperature of the external coolant. It was also noted that the thermodynamic parameters of steam are determined by the temperature and duration of thermal contact with the coolant. Thus, using the data obtained, it is possible to predict the properties of the porous material.

Preparation and properties of fluffy high-shrinkage polyester/polyamide 6 hollow segmented pie microfiber nonwovens

2021 ◽  
pp. 004051752110620
Author(s):  
Yongchao Duo ◽  
Xiaoming Qian ◽  
Baobao Zhao ◽  
Longfei Gao ◽  
He Bai ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Strength ◽  
Nonwoven Material ◽  
Polyamide 6 ◽  
Boiling Water ◽  
Efficient Production ◽  
Composite Fibers ◽  
Dry Heat ◽  
Nonwoven Materials ◽  
Shrinkage Effect

Bicomponent spunbond hydroentanglement technology can break the interface between the two components by physical extrusion and shearing, thereby realizing the green and efficient production of high-strength microfiber nonwoven materials. Herein, we report a soft and fluffy bicomponent spunbond hydroentanglement nonwoven material using high-shrinkage polyester/polyamide 6 (HSPET/PA6) as the bicomponent. HSPET/PA6 hollow segmented pie composite fibers with different volume ratios were prepared by spunbond technology, the HSPET and PA6 segments were alternately arranged, and the interface was flat. The composite fibers were split by heat treatment. The dry heat shrinkage rates of the composite fibers were 8.45% (50/50) and 10.57% (70/30), and the boiling water shrinkage rates were 10.02% (50/50) and 12.27% (70/30). HSPET/PA6 hollow segmented pie microfiber nonwovens were prepared by hydroentanglement technology. After heat treatment, the fibers of nonwovens were further split and the HSPET fibers curled, giving the nonwovens a fluffy characteristic. By comparing the properties of HSPET/PA6 after heat treatment, the shrinkage effect of the water bath was obviously better than that of dry heat, and the split degree of fibers reached 81.97% (50/50) and 84.65% (70/30). Compared with polyester/PA6 nonwovens, the softness of HSPET/PA6 nonwovens increased by 45.1% (50/50) and 49.3% (70/30) after boiling water shrinkage. At the same time, the mechanical properties of HSPET/PA6 nonwovens were also improved. The successful fabrication of HSPET/PA6 microfiber nonwovens provides a new method for enhancing the softness of bicomponent spunbond hydroentanglement nonwovens.

Study on Ausform Finishing Process and Gear Tooth Deformation for Hardened Gears

2012 ◽  
Vol 217-219 ◽  
pp. 2083-2087
Author(s):  
Yan Bin Li ◽  
Hong Gao ◽  
Tong Jiang ◽  
Ren Song Zou
Keyword(s):  
Heat Treatment ◽  
Gear Tooth ◽  
Gear Steel ◽  
Finishing Process ◽  
Engagement Process ◽  
Machine Industry ◽  
On Line ◽  
Precise Machine

An ausform finishing process that integrates heat treatment, rolling finishing and hardening of steel components into single on-line manufacturing operation is discussed in this paper ,with the gear steel 20CrMo which is widely used in auto and precise machine industry as a example .the tooth engagement process is modeled ,and the formulas for calculating deformation are deduced.

scholarly journals The prevalence of and resistance to antimicrobial agents of Bacillus cereus isolates from foodstuffs

2012 ◽  
Vol 48 (No. 11) ◽  
pp. 331-338 ◽  
Author(s):  
J. Schlegelova ◽  
J. Brychta ◽  
E. Klimova ◽  
E. Napravnikova ◽  
V. Babak
Keyword(s):  
Heat Treatment ◽  
Bacillus Cereus ◽  
Resistance Genes ◽  
Antimicrobial Agents ◽  
Meat Products ◽  
High Fat ◽  
Milk Products ◽  
Heat Treated ◽  
Skimmed Milk ◽  
Almost All

The study was aimed at the assessment whether foodstuffs contaminated with Bacillus cereus (B. cereus) may concurrently be vectors of spreading resistance. The contamination of foodstuffs with B. cereus strains was found in 31% of dairy and in 28% of meat products tested. Only one product from skimmed milk was contaminated. High-fat milk products that were heat-treated during the technological process (87 samples), as well as heat-treated meat products (65 samples), were contaminated significantly frequently (63% and 48% of the samples respectively) (P < 0.01). Almost all B. cereus isolates displayed low susceptibility to ampicillin, cephalothin, and to oxacillin. Except for streptomycin (STR) resistance, resistance to other 8 antimicrobial agents occurred sporadically. The STR resistant isolates came particularly from spreading buffer (8 samples) (P < 0.05). It was established that the same samples were contaminated with two subpopulations of B. cereus with different STR resistances. The frequent occurrence of B. cereus in foodstuffs with either fat content and/or subject to heat treatment in processing makes these products risky, however, our study did not confirm that foodstuffs contaminated with B. cereus are concurrently vectors of transmissible resistance genes.

scholarly journals Antibacterial effect of copper sulfate against multi-drug resistant nosocomial pathogens isolated from clinical samples

2019 ◽  
Vol 35 (5) ◽  
Author(s):  
Lamia Benhalima ◽  
Sandra Amri ◽  
Mourad Bensouilah ◽  
Rachid Ouzrout
Keyword(s):  
Antibacterial Activity ◽  
Copper Sulfate ◽  
Antimicrobial Agents ◽  
Antibacterial Effect ◽  
Hospital Environment ◽  
Clinical Samples ◽  
Drug Resistant ◽  
Nosocomial Pathogens ◽  
Sulfate Salts ◽  
Effect Of Copper

Background and Objective: With the emergence of antibiotic resistance and the hospital acquired infection, the interest for antimicrobial agents has recently increased again in public health. Copper is recommended as a supplementary method of increasing biological safety in the hospital environment. The objective of this study was to determine the antibacterial activity of copper sulfate salts on strains of bacterial pathogens isolated from different clinical pictures in different health establishment in Algeria. Methods: A total of 25 different bacterial isolates (16 Enterobacteriaceae, 5 Staphylococci, and 4 Pseudomonas) were tested for susceptibility to copper sulfate using minimum inhibitory concentration (MIC-Cu) and minimum bactericidal concentrations (MBC-Cu) determinations. All isolates were also tested for susceptibility to six antibiotics. Results: Antibiotic susceptibility studies revealed that 100% of isolates were resistant to one or more antibiotics. Fifty two percent of isolates were very susceptible to copper sulfate, with MICs ranging from 100 to 200 µg/ml. MBC-Cu = 1600 μg/ml showed the best bactericidal effect against the great majority of studied bacteria (52%). A good bactericidal activities of copper sulfate were recorded against Proteus vulgaris and Staphylococcus aureus (MBC/MIC=1). The Gram-negative bacteria isolates which were copper resistant also showed a high resistance to chloramphenicol (r=0.78) and Trimethoprime (r=0.61). Furthermore, the strains that were no-susceptible to three different antimicrobial classes (Escherichia coli, Staphylococcus saprophyticus) were not resistant to copper sulfate. Conclusion: Copper sulfate salts has significant antibacterial activity against multi-drug resistant nosocomial pathogens. doi: https://doi.org/10.12669/pjms.35.5.336 How to cite this:Benhalima L, Amri S, Bensouilah M, Ouzrout R. Antibacterial effect of copper sulfate against multi-drug resistant nosocomial pathogens isolated from clinical samples. Pak J Med Sci. 2019;35(5):---------.  doi: https://doi.org/10.12669/pjms.35.5.336 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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