Materials Literature
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Abstract Glycopeptides from carp swim bladder, guinea pig skin, and human skin collagens were prepared by sequential collagenase-trypsin digestion. Gel filtration on Sephadex G-25 permitted the isolation of a low molecular weight fraction containing most of the hydroxylysyl glycosides present in the parent collagen. A…
Abstract The curing reaction of polyester fumarate with styrene was investigated with a differential scanning calorimeter (DSC) operated isothermally. The change in rate of cure was followed over the whole range of conversion. The rate of cure is accelerated by the gel effect to about ten to fifty times the rate of mo…
Annealing treatments at elevated temperatures have been characterized by a specific infrared absorption assigned to the regularly folded chain segments in poly(ethylene terephthalate). The higher the annealing temperature, the more regular is the chain folding introduced into the fiber. When a fiber is free to contrac…
The 51V NMR of the diamagnetic V5+ and paramagnetic V4+ ions has been studied in the semiconducting V2O5–P2O5 glass system. From computer-simulation studies of the 51V NMR experimental spectra due to the V5+ sites, it has been determined that the spectra obtained at the higher spectrometer frequencies can be described…
Polytetrafluoroethylene (PTFE) has been γ-irradiated in the presence of gaseous radical scavengers. Irradiations in a vacuum resulted in small yields of low-molecular-weight fluorocarbons. The presence of methane during irradiation led to G(CH3F) = 0.06. Although hydrogen is a major product from the radiolysis of ethy…
A rise in specimen temperature due to electron irradiation was directly measured by using a microthermocouple composed of evaporated gold and palladium films. The temperature rise with an increase in electron current density was explained referring to the thermal conduction and thermal radiation effects. The experimen…
An absolute method of seam-strength testing is described. The effects of fabric type and gauge length on seam strength are examined. The effects of the type of sewing thread used and various measures of thread strength on the accuracy of seam-strength prediction are also investigated. A simple method of determining th…
Using a crystalline beryllium specimen, the excitation of plasma oscillation by X-rays was confirmed by examining the inelastic scattering for chromium K β 1 and copper K β 1 rays at various observation angles. The X-rays suffered an energy loss, which was equal to the plasmon energy of the solid and also satisfied th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOsmotic properties of divalent metal polystyrenesulfonates in aqueous solutionJacob A. Marinsky, M. Reddy, and A. SarkarCite this: J. Phys. Chem. 1970, 74, 22, 3891–3895Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published inissue 1…
Two MOS photomatrix configurations, voltage sampling and recharge sampling, have been compared with regard to sources of fixed-pattern noise. Voltage sampling provides a high-amplitude low-impedance photosignal, with FPN primarily due to threshold variation in the amplifying MOST at each element. Recharge sampling is…
Tetrahedral and octahedral cobalt(II), and square and octahedral nickel(II) complexes of 1,2-bis(2′-imidazolin-2′-yl)benzene, 1,2-bis(2′-imidazolin-2′-yl)ethane, and some imidazoline ring methyl substituted ligands are reported. The structures are confirmed by three X-ray structural analyses, magnetism, and electronic…
The rate and equilibrium of adsorptions of DDT, dieldrin, and heptachlor by illite, kaolinite, and montmorillonite from aqueous pesticidal solutions are evaluated using the batch technique under laboratory conditions. The adsorption of each of these three pesticides at an initial concentration of 100 μg/l by kaolinite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance identification of a nickel(III) compound produced by electrochemical oxidation of nickel(II) tetraphenylporphyrinAlexander Wolberg and Joost ManassenCite this: Inorg. Chem. 1970, 9, 10, 2365–2367Publication Date (Print):October 1, 1970Publicat…
The absorption spectrum of thin films of PuCl3 was measured at 298, 77, and 4°K in the range 6000–34 000 cm−1. Results were compared to earlier work in LaCl3 :Pu3+, and a number of new assignments were made. Electrostatic, spin–orbit, and configuration-interaction parameters were obtained by direct diagonalization of…
The iodine sorption test is a convenient though empirical method of measuring cellulose accessibility, but results show considerable variability. The relative importance of some experimental factors with respect to reproducibility of test results was, therefore, examined. Agitation during equilibration and use of a st…
The results of a preliminary study on the dosimetric characteristic of three different grades of commercial sintered beryllium oxide are reported. Among useful features of this promising thermoluminescent material a very low sensitivity to thermal neutrons (0.2 gamma -rads equivalent per 10 10 neutrons cm -2 ), a fair…
A series of crystalline metal glycerolato complexes has been prepared. The preparation of the cobalt, zinc, manganese, and iron complexes [(1 )-(4)] was achieved by heating (above 110º) glycerol with metal acetates, carbonates, oxalates, oxides, or hydroxides. The structure of (1) has been determined by X-rays and con…
Electron microscopic studies using thin sections revealed that Thermus aquaticus has a structure similar to that of most other gram-negative bacteria. The cell envelope is tripartite: plasma membrane, thin middle layer, and a thicker and irregular outer layer. The outer layer appears to be joined to the plasma membran…
The dynamic characteristics of a gas bubble situated in a viscoelastic fluid of three-parameter Oldroyd model is analytically investigated. Consideration is given to the influence of the thermodynamic process of the gas inside the bubble. An equation is derived which governs the timewise variation of the bubble size.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of barium sulfate to sulfur dioxide for mass spectrometric analysisBen D. Holt and A. G. EngelkemeirCite this: Anal. Chem. 1970, 42, 12, 1451–1453Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published inissue 1 O…