scholarly journals The method of purification of N-cyclohexyl maleimide - comonomer for heat-resistant optical methacrylic copolymers

2019 ◽  
pp. 26-35
Author(s):  
N. Yu. Ladilova ◽  
A. V. Zhivoderov ◽  
I. Yu. Makarova ◽  
M. N. Leshina ◽  
P. V. Kornienko ◽  
...  
Keyword(s):  
Heat Resistance ◽  
Organic Solvents ◽  
Experimental Evaluation ◽  
Steam Distillation ◽  
High Heat ◽  
High Heat Resistance ◽  
Main Substance ◽  
Heat Resistant ◽  
Purification Scheme

Experimental evaluation of various methods for the synthesis of purified N-cyclohexylmaleimide was carried out. It was shown that the monomer obtained by the combined purification scheme, including steam distillation and sequential recrystallization in organic solvents of diff erent polarities, allows to obtain N-cyclohexylmaleimide with the content of the main substance of at least 99.5 wt.% and with a yield of 70–80 wt.%.The monomer synthesized according to the proposed scheme does not contain polymerization-active and coloring impurities. It makes it possible to obtain unpainted methacrylic copolymers on its base with high heat resistance.

scholarly journals Molecular Physiological Characterization of a High Heat Resistant Spore Forming Bacillus subtilis Food Isolate

2021 ◽  
Vol 9 (3) ◽  
pp. 667
Author(s):  
Zhiwei Tu ◽  
Peter Setlow ◽  
Stanley Brul ◽  
Gertjan Kramer
Keyword(s):  
Bacillus Subtilis ◽  
Heat Resistance ◽  
Dipicolinic Acid ◽  
Laboratory Strain ◽  
High Heat ◽  
High Heat Resistance ◽  
Vegetative Cells ◽  
Heat Resistant ◽  
Food Isolate ◽  
Wet Heat

Bacterial endospores (spores) are among the most resistant living forms on earth. Spores of Bacillus subtilis A163 show extremely high resistance to wet heat compared to spores of laboratory strains. In this study, we found that spores of B. subtilis A163 were indeed very wet heat resistant and released dipicolinic acid (DPA) very slowly during heat treatment. We also determined the proteome of vegetative cells and spores of B. subtilis A163 and the differences in these proteomes from those of the laboratory strain PY79, spores of which are much less heat resistant. This proteomic characterization identified 2011 proteins in spores and 1901 proteins in vegetative cells of B. subtilis A163. Surprisingly, spore morphogenic protein SpoVM had no homologs in B. subtilis A163. Comparing protein expression between these two strains uncovered 108 proteins that were differentially present in spores and 93 proteins differentially present in cells. In addition, five of the seven proteins on an operon in strain A163, which is thought to be primarily responsible for this strain’s spores high heat resistance, were also identified. These findings reveal proteomic differences of the two strains exhibiting different resistance to heat and form a basis for further mechanistic analysis of the high heat resistance of B. subtilis A163 spores.

BEHAVIOR OF A HEAT RESISTANT FOOD SPOILAGE SPORE FORMING ANAEROBE INOCULATED INTO SOILS1,2,3

1954 ◽  
Vol 17 (7) ◽  
pp. 207-213
Author(s):  
N. W. Desrosier ◽  
W. B. Esselen ◽  
E. E. Anderson
Keyword(s):  
Heat Resistance ◽  
High Heat ◽  
Food Spoilage ◽  
High Heat Resistance ◽  
Heat Resistant ◽  
Experimental Soil

The heat resistance of putrefactive spore-forming anaerobes isolated from experimental soil plots was relatively low and not significantly influenced by different fertilizer treatments. The spores of Putrefactive Anaerobe No. 3679 retained their high heat resistance when they were inoculated into the test soils and were subsequently recovered several months later.

scholarly journals GEOMETRICAL–TOPOLOGICAL CHARACTERISTICS OF THE SUBSOLIDUS STRUCTURE IN THE MgO – Al2O3 – TiO2 SYSTEM

2021 ◽  
pp. 18-23
Author(s):  
Oksana Borysenko ◽  
Sergii Logvinkov ◽  
Halyna Shabanova ◽  
Igor Остапенко ◽  
Vita Шумейко
Keyword(s):  
Heat Resistance ◽  
High Heat ◽  
Point Of View ◽  
High Heat Resistance ◽  
Cubic Crystal ◽  
Heat Resistant ◽  
Temperature Ranges ◽  
Topological Characteristics ◽  
Elementary Triangle ◽  
Spinel Materials

Among the materials that attract attention from the point of view of creating refractory products with increased heat resistance, one can single out materials based on compositions of the MgO – Al2O3 – TiO2 system. As a result of the thermodynamic analysis of the MgO – Al2O3 – TiO2 system, it was found that the partition of the system into elementary triangles will change in three temperature ranges: I – up to 1537 K, II – in the temperature range 1537 – 2076 K and above 2076 K. It has been established that up to a temperature of 2076 K there is a concentration range of spinel phases: magnesium aluminate spinel – quandylite. Above 1537 K, there is a concentration range: tialite – karroite, which meets the requirements for materials with high heat resistance. The elementary triangle TiO2 – Al2TiO5 – MgTi2O5 can be used to obtain heat–resistant materials based on Al2TiO5 stabilized by MgTi2O5. To obtain heat–resistant periclase–spinel materials, an elementary triangle Mg2TiO4 – MgAl2O4 – MgO is recommended, in which only compounds with a cubic crystal lattice are present. Thus, the division of the MgO – Al2O3 – TiO2 system into elementary triangles and the analysis of the geometrical–topological characteristics of the phases of the system made it possible to select in the system under study the regions of compositions that have optimal properties for obtaining materials with the specified optimal properties.

scholarly journals Clustering rooting for the high heat resistance of some CHNO energetic materials

FirePhysChem ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 8-20
Author(s):  
Xingyu Huo ◽  
Fanfan Wang ◽  
Liang Liang Niu ◽  
Ruijun Gou ◽  
Chaoyang Zhang
Keyword(s):  
Heat Resistance ◽  
Energetic Materials ◽  
High Heat ◽  
High Heat Resistance

P-57: A Transparent Plastic Film having Excellent Optical Properties and High Heat Resistance for Flexible Display Substrates

2006 ◽  
Vol 37 (1) ◽  
pp. 418 ◽  
Author(s):  
Yoshiaki Watanabe ◽  
Ken-ichi Makita ◽  
Yasuyoshi Fujii ◽  
Hisanori Okada ◽  
Naoto Obara ◽  
...  
Keyword(s):  
Optical Properties ◽  
Heat Resistance ◽  
High Heat ◽  
Plastic Film ◽  
High Heat Resistance ◽  
Flexible Display ◽  
Transparent Plastic

Palladium-catalyzed silation of adamantanedi- and triol, leading to adamantane–siloxane alternating polymers with high heat resistance

Polymer ◽  
2007 ◽  
Vol 48 (15) ◽  
pp. 4301-4304 ◽  
Author(s):  
Joji Ohshita ◽  
Koichi Hino ◽  
Ko Inata ◽  
Atsutaka Kunai ◽  
Takayuki Maehara
Keyword(s):  
Heat Resistance ◽  
High Heat ◽  
High Heat Resistance ◽  
Palladium Catalyzed

A high heat-resistance bioplastic foam with efficient electromagnetic interference shielding

2017 ◽  
Vol 323 ◽  
pp. 29-36 ◽  
Author(s):  
Cheng-Hua Cui ◽  
Ding-Xiang Yan ◽  
Huan Pang ◽  
Li-Chuan Jia ◽  
Xin Xu ◽  
...  
Keyword(s):  
Heat Resistance ◽  
Electromagnetic Interference ◽  
High Heat ◽  
High Heat Resistance ◽  
Electromagnetic Interference Shielding

scholarly journals Factors Contributing to Heat Resistance of Clostridium perfringens Endospores

2008 ◽  
Vol 74 (11) ◽  
pp. 3328-3335 ◽  
Author(s):  
Benjamin Orsburn ◽  
Stephen B. Melville ◽  
David L. Popham
Keyword(s):  
Cell Wall ◽  
Heat Resistance ◽  
Clostridium Perfringens ◽  
Food Poisoning ◽  
High Heat ◽  
Relative Importance ◽  
High Heat Resistance ◽  
Factors Affecting ◽  
Cooking Process ◽  
Determining Factors

ABSTRACT The endospores formed by strains of type A Clostridium perfringens that produce the C. perfringens enterotoxin (CPE) are known to be more resistant to heat and cold than strains that do not produce this toxin. The high heat resistance of these spores allows them to survive the cooking process, leading to a large number of food-poisoning cases each year. The relative importance of factors contributing to the establishment of heat resistance in this species is currently unknown. The present study examines the spores formed by both CPE+ and CPE− strains for factors known to affect heat resistance in other species. We have found that the concentrations of DPA and metal ions, the size of the spore core, and the protoplast-to-sporoplast ratio are determining factors affecting heat resistance in these strains. While the overall thickness of the spore peptidoglycan was found to be consistent in all strains, the relative amounts of cortex and germ cell wall peptidoglycan also appear to play a role in the heat resistance of these strains.

Magnetic Domain Structures and Magnetic Properties of Lightly Nd-Doped Sm–Co Magnets With High Squareness and High Heat Resistance

2019 ◽  
Vol 55 (2) ◽  
pp. 1-4 ◽  
Author(s):  
Hiroaki Machida ◽  
Teruhiko Fujiwara ◽  
Chieko Fujimoto ◽  
Yu Kanamori ◽  
Jun Tanaka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Heat Resistance ◽  
Magnetic Domain ◽  
High Heat ◽  
High Heat Resistance ◽  
Domain Structures
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