in this work, we studied the effect of carboxylic acid on the rheological properties of a high-alumina cement mortar (ch45) produced by the algerian firm refractal.the investigated properties are setting time, water consumption, electrical conductivity, ph, density and the compressive strength. the results show a setting time of about 200 min for the acid free, 180 min with 0.1 % of carboxylic ...

BACKGROUND Caffeine is a commonly used drug for apnea of prematurity. It may, however, also have a beneficial effect on bronchopulmonary dysplasia (BPD), which is the most common complication of extreme preterm birth. OBJECTIVES To study the inflammatory, structural and functional effects of caffeine in an animal model of BPD. METHODS Preterm New Zealand-Dendermonde rabbits (gestational day...

Using density functional theory calculations and ab initio atomistic thermodynamics, H2O adsorption and dissociation on the Fe(110) p(4 × 4) surface at different coverages have been computed. At the lowest coverage, the adsorbed H2O, OH, O and H species can migrate easily on the surface. For (H2O)n adsorption, H2O molecules donating H atoms for H-bonding adsorb more strongly than those acceptin...

Recently, there has been much effort to find effective ingredients which can prevent or retard cutaneous skin aging after topical or systemic use. Here, we investigated the effects of the atomic hydrogen surrounded by water molecules, H(H2O)m, on acute UV-induced responses and as well as skin aging. Interestingly, we observed that H(H2O)m application to human skin prevented UV-induced erythema ...

Gasier HG, Riechman SE, Wiggs MP, Previs SF, Fluckey JD. A comparison of H2O and phenylalanine flooding dose to investigate muscle protein synthesis with acute exercise in rats. Am J Physiol Endocrinol Metab 297: E252–E259, 2009. First published April 14, 2009; doi:10.1152/ajpendo.90872.2008.—The primary objective of this investigation was to determine whether H2O and phenylalanine (Phe) floodi...

x-ray photoelectron and electron energy loss spectroscopic (xps-eels) studies reveal that the following species are present when a mixture of co2 and water vapour is exposed to the clean mg(100) surface at 110k: co3(a), c(a) ch(a), oh(a). the reactive chemisorptions of co2 and h2o vapour coadsorbed on a mg surface leads to the formation of ch bond. increasing the temperature to 400 k shows the ...

Gas phase reactions between hydrated protons H+(H2O)n and a substance M, as seen in atmospheric pressure chemical ionization (APCI) with mass spectrometry (MS) ion mobility (IMS), were modeled computationally using initial amounts of [M] [H+(H2O)n], rate constants k1 to form protonated monomer (MH+(H2O)x) k2 proton bound dimer (M2H+(H2O)z), diffusion constants. At 1 × 1010 cm–3 (0.4 ppb) for [H...

We have prepared some 3d-4f cyanide-bridged Ln(DMF)4(H2O)3Fe(CN)6•H2O complexes (Ln = Ce, Sm, Nd, and Gd; DMF = N,N-dimethylformamide) by substituting isotopes to H-substituted H2O and DMF and O-substituted H2O (and normal Hand O-H2O or H-DMF). We examined their crystal structures exhibiting negative thermal expansion and compared in view of hydrogen bonds and lanthanide contraction. Magnetic p...

A new proton transfer compound, formulated as (Hamp-6-pic)(Hpyzd) ∙H2O (1), has been synthesized from the reaction of pyrazine-2,3-dicarboxylic acid (H2pyzd)  and 2-amino-6-methyl pyridine (amp-6-pic), in 1:1 molar ratio. Extensive O−H×××O, N−H×××N and O−H×××O hydrogen bonds involving (Hamp-6-pic)+ cation, (Hpyzd)- anion and co-crystal water molecule٫ static electronic٫ and π…π stacking interac...