Showing papers by "University of Nevada, Reno published in 1981"
TL;DR: The key to mantled feldspar genesis is epitaxial nucleation of plagioclase on K-feldspar or on plagiocase as mentioned in this paper, which occurs in both volcanic and plutonic environments.
Abstract: The key to mantled feldspar genesis is epitaxial nucleation of plagioclase on K-feldspar or K-feldspar on plagioclase. Once this nucleation takes place there is a relatively straightforward process of crystal growth yielding “rapakivi” and “antirapikivi” textures. The most common mantling is plagioclase on K-feldspar which occurs in both volcanic and plutonic environments. In the volcanic environment the morphology of the plagioclase overgrowth typically is dendritic, though in subvolcanic and shallow plutonic environments dendritic growth is followed by a more or less continuous non-cellular shell of plagioclase. In the plutonic environment, early stages of plagioclase overgrowth also tend to be dendritic, although with coarser-grained characteristics. Dendritic morphology is thus a common denominator in rapakivi genesis. Since growth of dendritic plagioclase is clearly related to marked undercooling in silicate melt systems its occurrence in many volcanic rocks is to be expected. Equivalent quenching in the plutonic environment requires a cooling mechanism independent of conductive heat transfer to wallrock and also independent of effective cooling related to sudden loss of volatile phases that could only occur late in the crystallization of most magmas and therefore after much dendritic plagioclase had already formed. Internal quenching of portions of magma systems must occur if mafic magma is abruptly mixed with felsic magma. Such magma mixing yields a heterogeneous system at first, one that is in a drastic state of disequilibrium and tending to force nucleation of one feldspar type on the surface of another resulting in epitaxial crystallization of dendritic plagioclase on K-feldspar. Mantling of one feldspar type by another during magma mixing is paralleled by dendritic growth zones in coexisting plagioclase crystals.
371 citations
TL;DR: In this paper, a simple analytical model for the calculation of the seismic displacement history response of reinforced concrete frame and frame-wall structures is developed, which is idealized as a single-degree system consisting of a mass mounted on a rigid bar connected to the ground by a hinge and a nonlinear rotational spring.
Abstract: A simple analytical model is developed for the calculation of the seismic displacement history response of reinforced concrete frame and frame-wall structures. The computer cost for the model is approximately three precent of that for a MDOF system. A structure is idealized as a single-degree system consisting of a mass mounted on a rigid bar connected to the ground by a hinge and a nonlinear rotational spring. The primary force-deformation relationship for the spring is obtained by a static analysis of the multistory structure. To account for stiffness changes during an earthquake, a simple hysteresis model comprising only four rules is developed. The model is examined for eight small-scale ten-story reinforced concrete test structures, and the analytical results are compared with the measured response histories. The model is shown to be successful in most instances.
223 citations
151 citations
TL;DR: The cuticular hydrocarbons, some of which serve as components of the sex pheromone, of the house fly Musca domestica L. were identified by gas chromatography-mass spectrometry (GC-MS).
118 citations
TL;DR: The rewards of interaction interpretation of the similarity-attraction relationship implies that this relationship should be stronger when similarity has stronger implications for the quality of interaction as discussed by the authors. But the importance of an item is not correlated with the amount of information conveyed about interaction.
86 citations
TL;DR: In vitro studies with isolated tissues from adult flies showed that the hydrocarbon components of the sex pheromone were synthesized primarily by the epidermal cells in abdominal segments two to seven, and a comparison of the incorporation and distribution of labelled acetate, propionate and succinate into hydrocarbons indicated that the mono- and dimethylalkanes were formed by the substitution of a methylmalonyl-CoA for malonyl -CoA during chain elongation.
81 citations
TL;DR: The results of sex reassignment surgery for transsexuals are presented and other non-surgical, psychotherapeutic approaches to gender dysphoric patients call into question the justification for sex reassigning surgery.
Abstract: Fifteen years ago the author reviewed the world literature on male transsexualism (Pauly, 1965). Subsequently he summarized the results of sex reassignment surgery for male and female transsexuals ...
65 citations
TL;DR: Mitotic chromosomes from human peripheral lymphocytes studied at the junction of metaphase and anaphase show that the centromeres of various chromosomes separate in a nonrandom, apparently genetically controlled sequence.
Abstract: Mitotic chromosomes from human peripheral lymphocytes studied at the junction of metaphase and anaphase show that the centromeres of various chromosomes separate in a nonrandom, apparently genetically controlled sequence. It does not depend upon the position of the centromere in the chromosome, the length of the chromosome or total amount of detectable C-chromatin. In man, several chromosomes e.g. 18, 17, 2, separate very early. Such “early” cells do not include nos. 1, 13, 14, 15, and Y and very rarely nos. 21 and 22. The last separating chromosomes are those from group D, G, no. 1, 16, and Y. The possible implication of these findings in evolution, non-disjunction and the control of centromere separation sequences is discussed.
59 citations
TL;DR: The lipid components of the cuticle of both male and female wild type and yellow mutant fruit flies, Drosophila melanogaster, were analyzed and compared and no qualitative differences were observed in the hydrocarbons from female insects.
41 citations
TL;DR: Natural abundance 13C-NMR of 3-methylpentacosane showed that carbons 1 through 6, 23 through 25 and the branching methyl carbon (C26) each gave distinct signals, with carbons 7 through 22 indistinguishable from each other.
41 citations
TL;DR: Cuticular hydrocarbons of three species of bees and a digger wasp exhibited several features that have been correlated with low cuticular permeability, including n-Alkanes, branched alkanes and alkenes, which are commonly found in hot xerophytic environments.
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01 Sep 1981TL;DR: The findings suggest that 2',3'-cyclic nucleotide 3'phosphohydrolase is more widely distributed than was previously thought and that the enzyme may play a fundamental role in membranes, independent of their specialized structure or functions.
TL;DR: The data show that the American cockroach is capable of synthesizing linoleate, and suggest that linoleic acid is not an essential fatty acid in this insect.
TL;DR: In this article, the biosynthesis of (Z,Z)-6,9-heptacosadiene, the major cuticular hydrocarbon component of the American cockroach, was examined by radiotracer and 13C-nuclear magnetic resonance (NMR) techniques.
Abstract: The biosynthesis of (Z,Z)-6,9-heptacosadiene, the major cuticular hydrocarbon component of the American cockroach, was examined by radiotracer and13C-nuclear magnetic resonance (NMR) techniques. Sodium [1-14C] acetate was incorporated about equally into the saturated and diunsaturated hydrocarbons, whereas [1-14C] linoleate preferentially labeled the C27 alkadiene and [9,10-3H] oleate labeled the C27 alkadiene almost exclusively.13C-NMR demonstrated that [2-13C] acetate labeled carbons 25 and 27 but not carbon 3 of the C27 alkadiene. In addition, ozonolysis of the diene labeled from [1-14C] acetate followed by radio-gas liquid chromatography showed that carbons 1–6 were not labeled, whereas the fragment containing carbons 10–27 was labeled. The data presented in this paper indicate that linoleate from the diet or synthesized de novo is elongated by the addition of acetate units and is then decarboxylated.
TL;DR: The shape and structure of nucleosomes from chicken erythrocytes as a function of ionic strength in solution using the complementary techniques of streaming birefringence and intrinsic viscosity were studied and provide insights into possible conformational states of transcriptionally active chromatin at the nucleosomal level of structure.
Abstract: The shape and structure of nucleosomes from chicken erythrocytes as a function of ionic strength in solution using the complementary techniques of streaming birefringence and intrinsic viscosity were studied. As characterized by both rotational diffusion and optical anisotropy, three distinct conformational levels were observed. Above ∼8 mM ionic strength, the particles are oblate ellipsoids or discs with axial ratio of ∼0.5. Below ∼8 mM, two structural variants were observed: a relatively more symmetrical particle which exists between ∼8 and ∼0.5 mM, and a relatively asymmetric structure below ∼0.5 mM. Birefringence data are consistent with an “opened clamshell” type of model for the first of these and with a somewhat compacted form of linear DNA for the latter. The results provide insights into possible conformational states of transcriptionally active chromatin at the nucleosomal level of structure.
TL;DR: In this article, a kinetic investigation of the solid-phase deaquation reactions of [Co(NH 3 ) 5 H 2 O]X 3, where X − = Cl −, Br − or NO − 3 is reported.
TL;DR: The authors examined the uniqueness of family and work relationships and attempted to describe various ingredients that appear to lead to success in the two-career partnership and concluded that there are joys and sorrows associated with dual career marriages.
Abstract: Dual career marriages are a new phenomenon in the alternative family life-style scene in America. Working couples in general do not fit into the definition applied to this life-style. This is caused by the deep commitment that each partner feels for his or her work relationship. However, the 1980s will see significant increases in this group. There are joys and sorrows associated with dual career marriages. This article will examine the uniqueness of family and work relationships and will attempt to describe various ingredients that appear to lead to success in the two career partnership.
TL;DR: Mouse skin deoxyguanosine kinase was strongly inhibited by dGTP, dGDP and UDp, and unique to deoxynucleoside kinases was the observation that this enzyme possessed a pH optimum of 5.2.
TL;DR: The results indicate that human sensitivity to a number of blur pattern variables is high enough to be useful in guidance of locomotion and some of the information about motion contained in blur patterns may actually be form information.
TL;DR: In this paper, the Siegert boundary conditions were used in a direct solution of the Dyson equation for poles of the one-particle Green's function corresponding to resonances of the ($N\ifmmode\pm\else\textpm\fi{}1$)-particle systems and the pertinent complex pseudoeigenvalue problem was formulated as an implicit matrix eigenvalue equation.
Abstract: The use of Siegert boundary conditions in a direct solution of the Dyson equation for poles of the one-particle Green's function corresponding to resonances of the ($N\ifmmode\pm\else\textpm\fi{}1$)-particle systems is discussed and the pertinent complex pseudoeigenvalue problem is formulated as an implicit matrix eigenvalue equation. Thus the calculational setup is very similar to the methods employed in calculating atomic and molecular ionization potentials. Particular emphasis is laid upon the asymptotic expansion of the diverging Siegert orbital.
TL;DR: The data from the Δ9 desaturase measurements strongly suggest that the desaturases are involved with the ethanol-induced changes in the 20:4/18:2 ratios and in other unsaturated fatty acids.
TL;DR: The results demonstrate that the active site of 2',3'-cyclic nucleotide 3'-phosphodiesterase faces the cytoplasm of erythrocytes and that the enzyme may not span the lipid bilayer of the membrane.
TL;DR: Current interest in the enteric nervous system and its independent integrative function is discussed and four synaptic interactions known to occur within the system are analyzed.
Abstract: Current interest in the enteric nervous system and its independent integrative function is discussed. It is pointed out that about 25 putative neurotransmitters are considered to possibly participate in the actions of the plexuses comprising the complex. Four synaptic interactions known to occur within the system are analyzed. These are indicated by fast excitatory potentials (fast EPSPs), slow excitatory potentials (slow EPSPs), inhibitory postsynaptic potentials (IPSPs), and presynaptic inhibition. What is known about the neurons involved and the stimuli which produce activities in these elements is presented.
TL;DR: In this article, a new method is introduced that determines generalized skew coefficients using a weighting procedure based upon the variance of regional (map) skew coefficients and variance of sample skew coefficients.
Abstract: In order to promote a uniform and consistent approach for floodflow frequency studies, the U.S. Water Resources Council has recommended the use of the log-Pearson type III distribution with a generalized skew coefficient. This paper investigates various methods of determining generalized skew coefficients. A new method is introduced that determines generalized skew coefficients using a weighting procedure based upon the variance of regional (map) skew coefficients and the variance of sample skew coefficients. The variance of skew derived from sample data is determined using either of two non-parametric methods called the jackknife or bootstrap. Applications of the new weighting procedure are presented along with an experimental study to test various weighting procedures to derive generalized skew coefficients.
01 Sep 1981-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this paper, the solubility of cobalt in Cu2O-SiO2 slags held in silica crucibles and equilibrated with copper-cobalt alloys was investigated.
Abstract: The solubility of cobalt in Cu2O-SiO2 slags held in silica crucibles and equilibrated with copper-cobalt alloys has been investigated for conditions of varying amounts of cobalt in the alloy charged at a temperature of 1523 K. The solution of cobalt in slag from its alloy is explained by the equation: Co (in alloy) + Cu2O (in slag) = 2 Cu (in alloy) + CoO (in slag)
TL;DR: Comparison of transport rates indicates that although common mycorrhizal components are shared by roots of snow plants and trees, rates supporting rapid snow plant growth occur only in Abies concolor and Pinus Jeffreyi.