Comparison of Collagen Dynamics in Different Tissues Under the Influence of Estradiol
GRACE M. FISCHER; Comparison of Collagen Dynamics in Different Tissues Under the Influence of Estradiol, Endocrinology, Volume 93, Issue 5, 1 November 1973, Pag
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Exudation of an antioxidant additive from thin polyethylene films
Abstract Surface microscopy studies have revealed the phase separation and exudation of a phenol type of antioxidant [4,4′‐thiobis (3‐methyl‐6 tert. butyl phenol)] from polyethylene at concentrations of 0.08 percent by weight. The equilibrium solubility of the antioxidant in polyethylene was estimated to be less than…
DTA for control of stability in polyolefin wire and cable compounds
Abstract Differential thermal analysis offers a convenient and rapid way of determining stabilization levels in polyolefin compositions. Since it is normally used at temperatures in the fabrication range, it provides a direct readout of processing stability. At the same time, because the chemistry of the polymer syste…
Aging and degradation of polyolefins. III. Polyethylene and ethylene–propylene copolymers
Abstract Rates of oxygen absorption and formation of oxidation products were determined in γ‐initiated oxidations of thin films of high‐ and low‐density polyethylene, atactic and isotactic polypropylene, and of three ethylene–propylene copolymers. Radiation yields G for O 2 absorbed and formation of hydroperoxides dep…
Aging and degradation of polyolefins. II. γ‐initiated oxidations of atactic polypropylene
Abstract Oxidations of bulk atactic polypropylene (PP) have been carried out at 22 and 45°C, and the dependence of rate of formation of each product on rate of initiation has been determined. The principal product is PP hydroperoxide, formed in a half‐order reaction. One termination product is polymeric dialkyl peroxi…
Versetzungsstruktur und verfestigung von [100]-kupfereinkristallen
DISLOCATION STRUCTURE AND WORK-HARDENING OF COPPER SINGLE CRYSTALS WITH [100] AXIS ORIENTATION I. DISLOCATION ARRANGEMENT AND CELL STRUCTURE OF CRYSTALS DEFORMED IN TENSION Copper single crystals with [100] axis orientation are deformed in tension at room temperature and after load-removal are irradiated with neutrons…
Design and Operation of ETA, an Automated Ellipsometer
The design and operational features are described for a computer-assisted ellipsometer (called ETA for Ellipsometric Thickness Analyzer), developed to provide reliable, real-time measurement of field-effect transistor gate insulator thickness in a manufacturing environment. ETA illuminates the sample with light of fix…
Melting and crystallization behavior of poly(tetrafluoroethylene). New method for molecular weight measurement of poly(tetrafluoroethylene) using a differential scanning calorimeter
Abstract Melting and crystallization behavior of virgin polytetrafluoroethylene have been studied using a differential scanning calorimeter. Following quantitative relationship was found between number average molecular weight of polytetrafluoroethylene and the heat of crystallization in the molecular weight range of…
D-Glyceraldehyde-3-Phosphate Dehydrogenase: Three-Dimensional Structure and Evolutionary Significance
A 3.0-A resolution electron density map of lobster glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.12) was computed. The essentially single isomorphous replacement map was very substantially improved by averaging subunits. NAD binds in an open conformation at sites close to subunit interfaces. The coenzyme binding…
Formation of Ultrafine Metal Particles by Gas Evaporation Technique. I. Aluminium in Helium
The appearance of smoke was studied by a video tape recorder. A typical smoke consisted of inner zone, inner front, outer zone and outer front. Smoke particles collected at different parts were studied by electron microscopy. They were large and often showed clear-cut habits in the inner front, while they were small a…
Poly(arylene sulfides) with pendant cyano groups as high‐temperature laminating resins
Abstract Poly(phenylene sulfides) were synthesized from m ‐benzenedithiol and aromatic dibromides in a basic medium of potassium carbonate in dimethylformamide or dimethylacetamide. The products obtained were slightly off‐white with relatively low melting ranges and had inherent viscosities in the 0.2–0.4 dl/g range i…
Mechanism for the action of tackifying resins in pressure‐sensitive adhesives
Abstract In a study of pressure‐sensitive adhesives prepared from mixtures of natural rubber and three different tackifying resins, it was shown that a tackifying resin may form either one‐ or two‐phase systems with natural rubber. Measurements of the viscoelastic properties of the adhesives show that the effect of ta…
Ammonia Volatilization from Surface Applications of Ammonium Compounds on Calcareous Soils: I. General Theory
Abstract Volatilization of NH 3 from NH 4 ‐ ‐N salts applied to the surface of a calcareous soil was investigated. Ammonia losses from surface applied NH 4 F, (NH 4 ) 2 SO 4 , and (NH 4 ) 2 HPO 4 were 68, 54, and 51%, respectively, of the added NH 4 ‐ ‐N in 100 hours. Ammonium nitrate, NH 4 Cl, and NH 4 I lost 18, 18,…
The computation of radial distribution functions for glassy materials
A procedure is described for optimizing the extraction of information from the diffraction data of a glass. A least-squares technique that minimizes the spurious detail in the radial distribution function (RDF) at small and large interatomic distances is employed both to isolate that portion of the total intensity fun…
Structural studies of polyethers. IX. Planar zigzag modification of poly(ethylene oxide)
Abstract A new crystal modification was found in poly(ethylene oxide) stretched about two‐fold after necking at room temperature. An x‐ray diffraction analysis indicated that the planar zigzag molecule passes through a triclinic unit cell with parameters α = 4.71 Å, b = 4.44 Å, c (fiber axis) = 7.12 Å, α = 62.8°, β =…
Aggregation of nickel(II), copper(II), and zinc(II) derivatives of water-soluble porphyrins
The solution properties of the nickel(II), copper(II), and zinc(II) derivatives of tetracarboxyphenylporphine (TCPP) and tetra(N-methylpyridyljporphine (TMPyP) have been investigated. At μ = 0. 1 M and 25°, NiTMPyP, CuTMPyP, ZnTMPyP, and ZnTCPP show no tendency to aggregate. However, under these conditions NiTCPP and…
X-ray photoelectron spectra of lead oxides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectra of lead oxidesK. S. Kim, T. J. O'Leary, and Nicholas. WinogradCite this: Anal. Chem. 1973, 45, 13, 2214–2218Publication Date (Print):November 1, 1973Publication History Published online1 May 2002Published inissue 1 November 1973https://pubs.acs.or…
A New Micromethod for Determination of Protein in Cerebrospinal Fluid and Urine
Abstract We developed a new micro-scale procedure for determination of protein in cerebrospinal fluid and urine. The sample (50 µl) is mixed with a trichloroacetic acid—Ponceau S dye solution. The proteins, together with a proportional amount of dye, are precipitated and the red precipitate is dissolved in dilute sodi…
Glass transition temperature as a guide to selection of polymers suitable for PTC materials
Abstract It has been shown that the only way to predict the size of the PTC effect displayed by a crystalline polymer when filled with conductive particles is through the knowledge of the glass transition point of the polymer. The size of the PTC anomaly is found to decrease sharply with rise in glass transition tempe…
Optics in smoothly varying anisotropic planar structures: Application to liquid-crystal twist cells*
Optical transmittance and reflectance of continuously varying anisotropic planar media, such as nematic liquid crystals in Schadt–Helfrich twist cells or cholesterics between parallel rubbed surfaces, have previously been computed with a 4 × 4 matrix method by considering the medium as broken up into many thin paralle…