One of the effective ways to increase durability building products and structures operating under influence aggressive media is using sulfur binders manufacture concretes. It shown that chemical resistance concretes a greater extent depends on matrix composition. was found introduction modified additives increases their resistance. With optimal content additives, water composites from 2.3 3.2 t...

phenolic resins are synthetic low molecular weight thermoset resins which are polymerized and cured to higher molecular weights by condensation method. these resins have high weathering resistance, high oxidative thermal properties and good chemical resistance. phenolic resins can be cured thermally or by acid curing. the most common method of curing phenolic resin is by thermal curing that tak...

Mature bacterial spores can be manipulated by chemical pretreatments between states sensitive and resistant to dry heat. The two chemical forms of the spore differ in dry-heat resistance by about an order of magnitude. Log survivor curves for each chemical state were approximately straight lines. The temperature dependence of dry-heat resistance for each chemical state was similar to that usual...

1. The Eutrophication Process 2. Resistance to Increasing Nutrient Loading 2.1 Indirect Effects 2.2 Effects on Fish and Zooplankton 3. Triggering Factors for the Loss of Submerged Plants 4. Resistance to Decreasing Nutrient Loading 4.1 Chemical Resistance 4.2 Biological Resistance 5. How to Break the Chemical Resistance 6. H ow to Break the Biological Resistance 7. Perspectives Acknowledgments ...

new sources of maize resistance to the maize weevil, sitophilus zeamais infestation are indispensable in successful breeding programs against post harvest grain damage. the study investigated the characters and mechanisms that confer resistance to weevil infestation using twenty elite maize genotypes. detailed morphological and physical studies were conducted on whole-maize grain. the grain hul...

Abstract The use of polyurethane membranes is inseparable from its several advantages, including the minimal energy, fewer additional chemicals, and having good chemical resistance. membrane synthesized using red seaweed biomass (PUM-RSB) in this study was used as a filter ammonia filtration process water. specific objective research to regenerate test resistance membranes, study, an acid solut...