4,179 research outputs found
Electrophysiologic evaluation of neuromuscular functions during limb lengthening by callus distraction
No full textVaried clinical patterns, physical activities, muscle enzymes, electromyographic and histologic findings in patients wit
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Identification of a novel HLA-Cw*05 allele, Cw*0503
No full textHLA-Cw*05 is one of the least polymorphic subgroups of HLA-C; so far only two alleles, namely Cw*0501 and Cw*0502, have been reported. We report here the identification of a third allele, Cw*0503, in a Caucasian individual. Cw*0503 is closely related to Cw*0501 with only six nucleotide substitutions clustering over a fragment of 48 nucleotides at the beginning of exon 4. All these six substitutions at the same positions have been found only in HLA-B*44 alleles, suggesting that Cw*0503 is a result of recombination between Cw*0501 and one of B*44 alleles
LONG TERM STABILITY IN CW-CRDS EXPERIMENTS
No full textAuthor Institution: Department of Chemistry, University of Virginia, Charlottesville VA, 22904-4319Allan variance can be used to characterize the slow drift of CW cavity ring-down spectroscopy (CW-CRDS) system, caused by the instability of experimental environments. By including the differential measurement of on- and off-peak decay rates in the system, the drifting of both decay rates can cancel out greatly. A sensitivity of cm during an optimum integration time of 15.4 minutes has been obtained with our CW-CRDS system. This sensitivity corresponds a 3 methane detection limit of 0.3 parts per billion by volume (ppbv) in N at 20 torr or 37 parts per trillion by volume (pptv) in N at 760 torr measurement pressure, near 1.65 m laser wavelength
Novel spectral and electrochemical characteristics of triphenylamine-bound zinc porphyrins and their intramolecular energy and electron transfer
No full text[[abstract]]Porphine bearing triphenylamine (TPA) pendant groups and their zinc complexes, zinc meso-tetra-p-(di-p-phenylamino) phenylporphyrin (ZnTDPAPP) and zinc meso-tetra-p-(di-p-tolylamino) phenylporphyrin (ZnTDTAPP) are synthesized and their spectral and electrochemical characteristics are studied. Zinc meso-tetraphenylporphyrin (ZnTPP) and zinc meso-tetra-p-aminophenylporphyrin (ZnTAPP) are also used as reference complexes. The B and Q bands of ZnTDPAPP and ZnTDTAPP are located at higher wavelengths and the bandwidths become broader compared with those of ZnTPP and ZnTAPP, indicating the peripheral TPA affects the electronic configuration of zinc porphyrins. Upon excitation in CH2Cl2 at room temperature, the compounds exhibit intramolecular singlet energy transfer from the TPA to the porphyrin core, and emission from the porphyrins are observed. Both ZnTDPAPP and ZnTDTAPP are easier to be oxidized and harder to be reduced than ZnTPP, in agreement with the strong electron-donating effect of the TPA groups. Extra waves corresponding to the oxidation of TPA substituents are also observed. The cation radical ZnTDTAPP(+center dot) exhibits an absorption spectrum very different from the typical spectra for porphyrin cation radicals. The NIR absorption band at 1296 nm indicates the electron transfer occurs intramolecularly. The above results evince the ability of TPA to modulate the electronic structure of zinc porphyrins.[[note]]SC
Correlation of bilateral equinus contracture in a paraplegic patient with the Ilizarov technique.
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Cw ion lasers pumped by electron beams
No full textWe have obtained cw laser radiation from singly ionized Hg, I, Cd, Se, and As by exciting He metal-vapor mixtures with a dc electron beam. The beam is generated by glow discharge electron guns located apart from the active medium. This is the first time that cw ion laser action has been obtained using electron beam excitation
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