A series of novel monoazo-disperse dyes containing pyrazolo[1,5-a]pyrimidine structures were synthesized starting with the coupling reaction between ethyl cyanoacetate and 4-hydroxybenzenediazonium chloride, followed by treatment of the resulting hydrazone product with hydrazine hydrate. The pyrazolohydrazone 6 is then treated with either 2,4-pentandione and enaminonitrile or aryl-substituted e...

Based on the accretion induced magnetic field decay model, in which frozen field and incompressible fluid are assumed, we obtain the following results. (1) The analytic relation between the magnetic field and spin period is obtained if the fastness parameter of accretion disk is neglected. Our model evolutionary tracks of accreting neutron stars in P-B diagram are different from the equilibrium...

This study developed a novel pH-mediated antimicrobial dyeing process of cotton with prodigiosins nanomicelles produced by microbial fermentation. The average diameter of the pigment nanomicelles was 223.8 nm (range of 92.4–510.2 nm), and the pigment concentration was 76.46 mg/L. It was found that the superior dyeing effect of cotton fabric was achieved by adjusting the dye bath pH. When the pH...

Polymeric dyes are composed of optically chromophoric groups bound to or into polymers 1 which offer the advantage of allowing a range of physical properties, such as solubility, absorption, migration, and viscosity, that are tunable. They do not sublime, are nonabrasive,and generally have low toxicity. The range of products possible offered by the joining of the fields of polymer chemistry and...

Acid-fastness is usually defined by the Ziehl-Neelsen technique: staining in carbol-fuchsin, differentiation in HCl-alcohol, and counterstaining in methylene blue.8 As a result, acid-fast substances are red, non-acid-fast materials, blue. Some authors have felt that this property of differential staining resided in one specific type of compound, the mycolic acid type of long-chain fatty acid fo...

Invasive alien plants that damagingly overgrow native ecosystems can be beneficially used to produce natural dyes. Natural dyes are healthier and more environmentally friendly than synthetic dyes, so their use on textiles other products come into contact with humans is desirable. In this study, the possibility of using a dye extracted from purple petals invasive plant Impatiens glandulifera Roy...