(1) Background: d-alanine-d-alanine ligase (DdlA), an effective target for drug development to combat against Mycobacterium tuberculosis (Mtb), which threatens human health globally, supplies a substrate of d-alanyl-d-alanine for peptidoglycan crosslinking by catalyzing the dimerization of two d-alanines. To obtain a better understanding of DdlA profiles and develop a colorimetric assay for hig...

We evaluated alamarBlue as a metabolic indicator in a standardized assay for the measurement of serum bactericidal activity (SBA) to Haemophilus influenzae type b (Hib) using sera containing natural and vaccine-induced anticapsular (polyribosylribitol phosphate) antibodies. SBA assays with a colorimetric and a fluorometric end point in the presence of alamarBlue were developed and compared to a...

Device independent color requires that all color imaging devices “speak” in CIE colorimetric terms. A color image scanner is one component of the desktop color imaging chain that needs to be colorimetric if color is to be device independent. Most commercial color scanners are not colorimetric. Instead, they are built as color densitometers, emulating commercial graphic arts scanners. There are ...

Colorimetry, 2 edition (4) contains all the definitions of colorimetric terms, discusses CIE colorimetric practice and provides many useful tables to perform colorimetric calculations. CIE Technical Committee TC 1-48 deals at the present moment with updating this publication. The update will not change anything basic in CIE colorimetry. It will mainly get the recommendations in line with the re...

Since the introduction by Walsh12 in 1955 of atomic absorption spectrophtometry as an analytical method, it has found application in many fields as a means of rapid analysis of certain metallic elements at very low concentrations. The analysis of agricultural materials, i.e., leaves, soil extracts and fertilizers is one sphere in which atomic absorption has been applied by several workers1, 2, ...

A novel thiazolothiazole-based Cu(2+) colorimetric and fluorescent sensor is reported. A highly selective colorimetric change from yellow to dark green was observed among various metal ions after adding Cu(2+). Unique radical formation can engender these highly selective colorimetric and fluorescent changes.

The objective of this study was to investigate the effects combined processes at low temperature on quality acerola (Malpighia punicifolia L.) and jaboticaba (Myrciaria cauliflora Berg). Acerola were subjected different treatments: infusion in calcium chloride, freezing temperatures (-20 -80 °C) freeze-drying. Physicochemical, colorimetric, scanning electron microscopy (SEM), texture (firmness)...