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...

The mouse lymphoma L5178Y/TK1/–-3.7.2C mutagenesis assay (MLA) is widely used to identify chemicals that are capable of inducing mutational damage (Mitchell et al., 1997). Mutants detected in the assay form a bimodal distribution based on colony size. More than two decades of research demonstrate that both small and large colony trifluorothymidine-resistant (TFTr) colonies are ‘true mutants’ an...

Antibiotics increase the frequency of resistant bacteria by providing them a competitive advantage over sensitive strains. Here, we develop a versatile assay for differential chemical inhibition of competing microbial strains, and use it to identify compounds that preferentially inhibit tetracycline-resistant relative to sensitive bacteria, thus "inverting" selection for resistance. Our assay d...

A convenient, effective, and scalable protocol for stabilizing volatile liquid chemicals is reported. Through the use of halogen-bond driven co-crystal synthesis, several examples of liquid iodoperfluoroalkanes are transformed into crystalline materials with low-vapor pressure, considerable thermal stability, and moisture resistance. The target compounds can subsequently be re-generated through...

Ferula persica, is the well-known species of the genus Ferula in Iran and has two varieties: persica and latisecta. They have both been extensively used in traditional medicine for a wide range of ailments. A great number of chemical compounds including sesquiterpene coumarins and polysulfides have been isolated from this plant. Fresh plant materials, crude extracts and isolated components of F...

Concern about the effects of pesticides on human health and the environment, has been a major rationale for promoting transgenic crops, often referred to as genetically modified organisms (GMOs), or as genetically enhanced (GE) crops. Companies that sell genetically engineered crop plants claim that biotechnology offers a safe alternative to agricultural chemicals and is necessary to feed the w...

In practice, agricultural films must withstand high solar radiation, high temperature in use, mechanical stresses on the film (e.g., film tension across supports, wind), and most importantly, the antagonistic effects of agro-chemicals (pesticides, insecticides, fumigants, soil disinfectants, etc.) on the performance of the UV light stabilizers protecting the film. With pesticide usage, especial...