نتایج جستجو برای: hexamethylenetetramine bromine
تعداد نتایج: 2569 فیلتر نتایج به سال:
It is well known that iodine is widely used as a disinfectant for small wounds. The aim of the present work was to find out whether bromine can replace iodine for this purpose. Experiments carried out by Babcock (1945) on man and by the author on rabbits in vivo (to be published shortly) showed that treatment of wounds with elementary bromine had a marked therapeutic effect. Toxicity tests comp...
Drinking water disinfection by-product (DBP) occurrence research is important in supporting risk assessment and regulatory performance assessment. Recent DBP occurrence surveys have expanded their scope to include non-regulated priority DBPs as well as regulated DBPs. This study applies a Box-Cox transformed multivariate normal model and data augmentation methods for left-censored and missing o...
Bromoperoxidases from the brown alga Ascophyllum nodosum, abbreviated as V(Br)PO(AnI) and V(Br)PO(AnII), show 41% sequence homology and differ by a factor of two in the percentage of α-helical secondary structures. Protein monomers organize into homodimers for V(Br)PO(AnI) and hexamers for V(Br)PO(AnII). Bromoperoxidase II binds hydrogen peroxide and bromide by approximately one order of magnit...
A chiral anion phase-transfer system for enantioselective halogenation is described. Highly insoluble, ionic reagents were developed as electrophilic bromine and iodine sources, and application of this system to o-anilidostyrenes afforded halogenated 4H-3,1-benzoxazines with excellent yield and enantioselectivity.
Photodissociation of gaseous bromocyclopropane via its A-band continuum has been studied at excitation wavelengths ranging from 230 nm to 267 nm. Velocity-map images of ground-state bromine atoms (Br), spin-orbit excited bromine atoms (Br(∗)), and C3H5 hydrocarbon radicals reveal the kinetic energies of these various photofragments. Both Br and Br(∗) atoms are predominantly generated via repuls...
Abstract Unlike bromine, the effect of iodine chemistry on Arctic surface ozone budget is poorly constrained. We present ship-based measurements halogen oxides in high boundary layer from sunlit period March to October 2020 and show that enhances springtime tropospheric depletion. find chemical reactions between are second highest contributor loss over study period, after photolysis-initiated a...
Two data sets were collected on single crystals of hexamethylenetetramine (urotropin) using a fourcircle diffractometer with Cu K~ radiation and an imaging-plate two-dimensional detector with Mo K~ source using the rotation method. Both data sets extend to the same limit of sin 0/2 = 0.62A -~, corresponding to a resolution of 0.81 ,&. Different processing protocols were employed for the two set...
We develop a performance model for a polymer electrolyte membrane based regenerative hydrogen-bromine fuel cell (rHBFC). The model includes four voltage loss mechanisms: ohmic loss through the membrane, hydrogen electrode activation, bromine electrode activation, and bromine electrode mass transport. We explore a large parameter space by looking at the dependences of each of these losses as a f...
In the polar tropospheric boundary layer, reactive halogen species (RHS) are responsible for ozone depletion as well as the oxidation of elemental mercury and dimethyl sulphide. After polar sunrise, air masses enriched in reactive bromine cover areas of several million square kilometers. Still, the source and release mechanisms of halogens are not completely understood. We report measurements o...
During springtime in the polar regions, unique photochemistry converts inert halide salt ions (e.g. Br) into reactive halogen species (e.g. Br atoms and BrO) that deplete ozone in the boundary layer to near zero levels. Since their discovery in the late 1980s, research on ozone depletion events (ODEs) has made great advances; however many key processes remain poorly understood. In this article ...
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