Materials Literature
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Secondary electron yields δPE due to primary electrons of kilo-electron-volts are estimated for various metals by measuring total electron yields δT in an UHV system and using a Monte Carlo calculation to derive δPE from δT. The dependences of δT/δPE as well as δPE on both the atomic number Z and primary energy are al…
We have partially purified homoserine kinase from a genetically derepressed strain of Escherichia coli K-12. The optimum pH of the enzyme-substrate reaction was 7.8 and the K(m) values for l-homoserine and adenosine 5'-triphosphate were both 3 x 10(-4) M. K(+) (or NH(4) (+)) as well as Mg(2+) were required for its act…
The hyperfine field and isomer shift at iron sites in dilute iron-base alloys containing Ge, As, Sn, and Sb impurities were determined by M\"ossbauer measurements. Similar information was obtained for the tin sites in $\mathrm{Fe}$ Sn alloys. These experimental data, together with those published earlier for Al, Si, a…
Abstract The physical properties and the chemical reactivity of the porphyrin macrocycle, whose formation can be rationalized by a simple statistical argument, are related in many respects to those of aromatic hydrocarbons. The reactivity of the porphyrin ligand in its metal complexes varies within wide limits because…
The deformation of high-density polyethylene with a single crystal texture by shear in directions perpendicular to the chain direction has been examined by wide-angle X-ray diffraction. It is found that samples can undergo either a martensitic transformation to a monoclinic cell, (100) [010] slip or (110) twinning dep…
This article is concerned with the electronic transport properties of the large group of solids (and also some liquids) which possess carrier mobilities from 10 cm2V-1sec-1 to many orders below that value. Its main aim is to trace the close relation between transport and localization. To this end the physical basis of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and structural and magnetic characterization of .beta.-di-u-hydroxo-bis [2-(2-dimethylaminoethyl)pyridine]dicopper(II) perchlorateDavid L. Lewis, Kenneth T. McGregor, William E. Hatfield, and Derek J. HodgsonCite this: Inorg. Chem. 1974, 13, 5, 1013–1019Publicati…
On the basis of proposals by Cahn [Acta Met. (1962). 10, 179-183] for cubic crystals, a coherent elastic model is developed which makes it possible for the orientations of exsolution boundaries formed either by spinodal decomposition or homogeneous nucleation to be predicted. The elastic energy for the coherent exsolu…
ABSTRACT The mineralogy and geochemistry of clastic sediments in the 1000 m thick Lower Palaeozoic marine sequence of the Oslo Region is discussed on the basis of 200 chemical (XRF) and mineralogical (X‐ray diffractometer) analyses. The composition of these sediments is considered to largely be a function of the relat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic routes to halomethyl vinylsilanesGilbert Stork, Michael E. Jung, Ernest Colvin, and Yves NoelCite this: J. Am. Chem. Soc. 1974, 96, 11, 3684–3686Publication Date (Print):May 1, 1974Publication History Published online1 May 2002Published inissue 1 May 1974https://pu…
The preliminary check-list of British marine diatoms first appeared in this Journal about 20 years ago (Hendey, 1954), and since that time many advances have been made in the study of these organisms. First, the known flora has been extended very considerably (Hendey, 1964, 1973) and much has been added to our knowled…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and Deformation Mechanism of Segmented Poly(urethaneureas) in Relation to Spherulitic Crystalline TexturesItsuro Kimura, Hideaki Ishihara, Hiroshi Ono, Nori Yoshihara, Shunji Nomura, and Hiromichi KawaiCite this: Macromolecules 1974, 7, 3, 355–363Publication Date…
A series of poly(ethylene terephthalate) fibers of various molecular weights was first drawn to a practical maximum draw ratio and then allowed to contract thermally under tension for 10, 20, and 38%. These contracted fibers exhibit a high degree of plasticity even when tested at—100°C and extension rates of 1300%/sec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Toluene SolutionsTakeji Hashimoto, Kikuo Nagatoshi, Akira Todo, Hirokazu Hasegawa, and Hiromichi KawaiCite this: Macromolecules 1974, 7, 3, 364–373Publication Date (Print):May 1, 1974Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic studies for tetraphenylporphyrincobalt(II) complexes of carbon monoxide, nitrogen oxide, molecular oxygen, methylisonitrile, and trimethyl phosphite, and a bonding model for complexes of carbon monoxide, nitrogen oxide, and molecular oxygen with cobalt(II) and…
PVT meas ure me nts we re mad e o n liquid and glassy poly(vinyl ace tate) ove r ra nges of -30 to 100 C and 0 to 800 ba r (gage press ure). Th e data we re ob tained by three diffe rent th e rmodynami c hi stories: (a) variable formation press ure. (b) co nsta nt formati on press ure at one a tm os ph e re, a nd (c)…
Human dermis was digested with pepsin under conditions that maintain the helical conformation of the bulk of the collagen.Molecules containing (rl(II1) chains were separated from [al(I)]& collagen by differential salt precipitation at pH '7.5, with the use of the peptides produced by CNBr cleavage to monitor the compo…
A new mechanism is proposed for the formation and the migration of planar defects in ABO3+x, perovskite-type compounds.
In an attempt to provide objective measures of the changes induced in chert by heat treatment, ten pairs of preforms were made, and one of each pair was heat treated, using a probable aboriginal technique. Paired bifaces were then chipped from the preforms. Differences in the flaking qualities of the heated and the un…
SUMMARY Techniques used by the authors for preparing wood samples for the scanning electron microscope are detailed. Topics covered include: procedures for cutting, cleaning, dehydrating, mounting and storage of the specimens.