Chondroitin sulfate (CS) is a relevant family of polysaccharides that participates in a large variety of biological events that are related to neural processes by regulating various growth factors through the pattern and degree of sulfation of the polysaccharide. However, their own complexity ma...

A strategy based on a regioselective 6-O-desulfation reaction and negative ion electrospray ionization tandem mass spectrometry (ESI-MS(n)) was developed for the structural delineation of isomeric chondroitin sulfate oligosaccharides. Product ions resulting from the glycosidic cleavage provided ...

The parotoid gland of bufonids is characterized as a specialized integument region, formed by different gland types. The secretion elaborated by the largest glandular alveoli has been related to animal chemical defense and is constituted by granular protein content, associated with a basophilic ...

The purpose of this work is to stabilize zein nanoparticles with anionic polysaccharides—chondroitin sulfate (CS) to overcome the poor colloidal stability of zein nanoparticles. The average molecular weight of CS was 20.51 kDa and the disaccharide composition of CS was 70.71% monosulfated disac...

Magnesium chondroitin sulfate (MgCS) has been fabricated and characterized in this study. We investigated its morphology, composition as well as structure. The results verify that the sodium of sodium chondroitin sulfate (CS) is successfully replaced by magnesium and formed a polysaccharide-meta...

The specific heat of Cry-Con grease, a copper loaded electrically insulating grease, was measured between 0.5 and 20 K. The low specific heat and high thermal conductivity of Cry-Con grease render it a useful thermal bonding material for calorimetric measurements on samples with low thermal cond...

Vacuum greases have been studied to show what effect the use of any particular grease would have on the performance of a vacuum system. The work has shown greases to be roughly divided into two main groups, those whose vapour emission is mass dependent and those in which only the surface area is...

Abrupt increases in the thermal conductances of Apiezon N and T grease have been observed, and it is surmised that these discontuities, as well as published anomalies in the specific heat, are related to glass transition temperatures (Tg (N) = 273 K and Tg (T) = 210 K) of the greases.

The gas chromatographic behaviour of the widely used “Apiezon” stationary phases was evaluated, taking into account several parameters. Paraffins and other homologous series were analysed at temperatures ranging from 50° to 300°, on Apiezon L, M and N, at liquid phase concentrations ranging ...

Long-lived (~12s) luminescence from Apiezon compounds (greases and wax) has been measured following ultraviolet or visible excitation in the temperature regime 8–300 K. A typical spectrum consists of a single Gaussian band centered near 2.2 eV. The intensity of this band is maximum at the lowes...

Measurements carried out on bulk samples of apiezon N grease in nylon tubes indicate that the grease behaves as a thermal insulator between 4.2 and 1.4 K, and therefore applications utilizing thick grease coatings to provide thermal contact should be avoided. In addition it was observed that the...

The specific heat, C, of Abiezon N grease was measured between 0.1 K and 2.5 K where C = aT + bT3 was found with a = 1.32 × 10−6 J g−1 K−2 and b = 2.58 × 10−5 J g−1 K−4. Below 0.25 K and additional contribution ΔC to C which is visible only in the long term specific heat, is observed. ΔC var...

The thermal conductance of pressed contacts which have been augmented with indium foil or Apiezon-N™ grease has been measured over the temperature range 1.6–6.0 K, with applied forces from 22 to 670N. The sample pairs were fabricated from OFHC copper, 6061-T6 aluminium, free-machining brass and...

Zinc chloride and hydrochloric acid extraction from solutions of high zinc concentration by tri-n-butyl phosphate (TBP) diluted in ShellSol 2046 (an aliphatic solvent) has been studied with a combination of experiments and mathematical modelling. Above 0.4 mol/L aqueous zinc chloride, zinc is ex...

The influence of panosialins A, B, and C (1, 2, 3) from streptomycetes on the conductivity and ion penetration of an artificial bilayer membrane was studied. A remarkable increase in membrane current suggested the formation of ion pores. Differences in pc/pa ratio were observed in the dependence...

New triazine-stilbene fluorescent brighteners containing an acrylamide group have been synthesized. Their absorption and fluorescence characteristics in aqueous solution were investigated and their fluorescence quantum yields (0·24–0·36) estimated. The compounds gave a high degree of whitenes...

The copolymerization of methylmethacrylate (MMA) with 1,8-naphthalimide fluorescent brighteners (fluorophores) yielding transparent blue fluorescent side-group copolymers has been investigated. It has been found that more than 0.92% of the fluorophores are chemically bonded to the polymer chain....

In this work, luminescence properties of Tb3+/Sm3+ co-doped lead borate glasses are examined in details. Luminescence spectra of rare earths were measured under different excitation wavelengths. Characteristic luminescence bands corresponding to electronic transitions of terbium and samarium ion...

Fully amorphous lead borate glasses triply doped with Dy3+/Tb3+/Eu3+ were synthesized and next studied using optical spectroscopy. The characteristic luminescence bands originating to electronic transitions of Dy3+/Tb3+/Eu3+ ions were observed under direct excitation of Dy3+. Moreover, the influ...

Calcium phosphate scaling is one of the main limitations in effluent desalination using membranes. This may be overcome by tailoring membranes with lower rejection of the scalant ions.In this study, we systematically examined the use of negatively and positively charged membranes, rejecting ions...