Twenty four reference strains and 112 clinical isolates of coagulase negative staphylococci (CNS) were examined for their reactions in the crystal violet test. Some species gave a white reaction and others a purple reaction. Results were consistent and reproducible and each species gave only one pattern of crystal violet reaction. Within the limited variety of species represented in the clinica...

the heterogeneous photo-fenton degradation of crystal violet under visible light has been investigated usingcopper modified iron oxide. the photocatalyst has been prepared by coprecipitation method. the rate ofphotocatalyic degradation of dye was monitored spectrophotometrically. it has been observed thatphotocatalytic degradation follows pseudo first order kinetics. the effect of various param...

a new, local agro-industrial waste was valorized by chemical treatment and tested for its ability to remove cationic dye from aqueous solution. tendu (diospyros melanoxylon) leaves refuse, a solid waste from bidi industry which caused disposal problem, was studied as a biosorbent. raw tendu waste (tlr), along with sulfuric acid carbonized tendu waste (tlr-cm) and tendu waste treated with dilute...

In previous work, Vibrio proteolyticus 5S rRNA was shown to stabilize 13-50 nucleotide "guest" RNA sequences for expression in Escherichia coli. The expressed chimeric RNAs accumulated to high levels in E. coli without being incorporated into ribosomes and without obvious effects on the host cells. In this work, we inserted sequences encoding known aptamers recognizing a protein and an organic ...

Naphthoquinone pigments 2-methyl-3-(4- or 2-hydroxyphenylthio)-1,4-naphthalenedione show characteristic optical properties in solution and in the solid state. The position of the OH group in the pigment leads to varied optical properties, including a characteristic colour, in the solid state. The pigment with a 2-OH substituent displays solvatochromism in solution, and that with a 4-OH substitu...

In order to analyse paintings, specialists use many different techniques exploring different parts of the electromagnetic spectrum: near infra-red, ultra-violet, X-rays, etc. But surprisingly, the visual domain has rarely been analysed, probably because colour perception is a very complex domain, being rather difficult to analyse adequately by means of automatic techniques. Our visual sensation...

Single phase anatase titania powders with size below 20 nm and surface area of 75 m /g were 2 synthesized by a simple precipitation method at pH 5 and dehydration of agglomerates by azeotropic distillation. The powders were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface area, after calcinations at 550°C for 3 hrs. This nanoparticles was used for...

17 Iridescence is a property of structural colour that is occasionally encountered in higher 18 eukaryotes but which has been poorly documented in the prokaryotic kingdom. In the present 19 work, we describe a marine bacterium, identified as Cellulophaga lytica, isolated from the surface 20 of an anemone, that exhibits bright green iridescent colonies under direct epi-illumination. This 21 phen...

Methyl violet 2B dye is a major contaminant that detrimental to both humans and aquatic microorganisms, thus it should be eliminated from water. In the current investigation, biosorption of methyl onto brown seaweed Cystoseira tamariscifolia biomass as sustainable low-cost biosorbent was examined by varying parameters. Biomass dosage 7 g/L, pH 6, temperature 45 °C, 60 min contact time, 30 mg/L ...

The North American stalked puffball Calostoma cinnabarinum (Boletales) owes its red-orange colour to the heptaene pigment calostomal. Its structure has been determined by 1H and 13C NMR spectroscopy of the corresponding methyl ester as all-trans-16-oxohexadeca-2,4,6,8,10,12,14heptaenoic acid (1). Neither pulvinic acids nor other typical Boletales pigments could be detected in this fungus. The s...