In order to improve the stability of high color-purity red phosphors for ultraviolet excitation, we encapsulated an Eu-chelate, Eu(HFA)3(TPPO)2, by sol-gel derived glass networks and studied its thermal stability as well as photoluminescence (PL) characteristics. The PL quantum yield of an encapsulated sample was ten times higher than that without encapsulation after annealing at 160 °C for 2 h...

The present study explores the mechanism of cellulose biosynthesis in Gluconoacetobacter hansenii. The cellulose synthase enzyme was purified as membrane fraction and solubilized by treatment with 0.1% digitonin. The enzyme was separated by native-gel electrophoresis and β -D-glucan analysis was carried out using in vitro gel assay. The cellulose synthase has glycoprotein nature and composed tw...

In this article, a hybrid gel has been developed using sodium alginate (Alg) and α-tricalcium phosphate (α-TCP) particles through ionic crosslinking process for the application in bone tissue engineering. The effects of pH and composition of the gel on osteoblast cells (MC3T3) response and bioactive molecules release have been evaluated. At first, a slurry of Alg and α-TCP has been prepared usi...

A 4-nitrobenzohydrazide derivative, N-(3,4,5-octyloxybenzoyl)-N'-(4'-nitrobenzoyl)hydrazine (C8), was synthesized. It could form stable gels in some of the tested organic solvents. The wide-angle X-ray diffraction analysis showed that the xerogels exhibited a layered structure. SEM images revealed that the molecules self-assembled into fibrous aggregates in the xerogels. FT-IR studies confirmed...

A new gelator 1 that included m-methyl red was synthesized and fully characterized. It was found that the organogel of 1 was stable in DMSO even if the organogel was stimulated by acid or light. The organogel was thoroughly characterized using various microscopic techniques including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-vis and Fourier transform infra...

A flow cell has been designed for use with an electrochemical enzyme biosensor, based on low-cost carbon-film electrodes. Three types of mediators were used: cobalt and copper hexacyanoferrates and poly(neutral red) (PNR), covered with glucose oxidase (GOx) immobilised by cross-linking with glutaraldehyde in the presence of bovine serum albumin or inside a oxysilane sol-gel network. Mixtures of...

The proportion of spectrin tetramers and dimers in 4 degrees C low ionic strength extracts of red cell membranes of 9 subjects with 4 different variants of hereditary elliptocytosis (HE) and 2 subjects with hereditary spherocytosis (HS) was determined by nondenaturing gel electrophoresis. Such extracts reflect the native oligomeric state of spectrin in the red cell membrane. In two hemolytic HE...

Ethylene production by locule gel tissue excised from immature tomato fruit was inhibited by exposure to 4.5 mmol l C2H4, and 1-aminocyclopropane-1-carboxylic acid (ACC) content was reduced. In contrast, CO2 production, ethylene forming capacity (EFC), red colour development, tissue liquefaction and seed maturation as measured by subsequent germination rate were stimulated by C2H4, and, in imma...