Showing papers by "Texas A&M University published in 1970"
01 Jan 1970
2,059 citations
130 citations
TL;DR: In this article, the Schrodinger equation for the potential function V =z4+Bz2 where B may be positive or negative is solved in reduced form and the first 17 eigenvalues are reported for 58 values of B in the range −50 ≤ B ≤ 100.
Abstract: The one-dimensional Schrodinger equation in reduced form is solved for the potential function V=z4+Bz2 where B may be positive or negative. The first 17 eigenvalues are reported for 58 values of B in the range −50 ≤ B ≤ 100. The interval of B between the tabulated values is sufficiently small so that the eigenvalues for any B in this range can be found by interpolation. At the limits of the range of B the potential function approaches that of a harmonic oscillator with only small anharmonicity. The effect of a small Cz6 term on this potential is studied and it is concluded that a previously reported approximation formula is quite applicable but only for positive values of B. The success of the quartic–harmonic potential function for the analysis of the ring-puckering vibration is shown; it is also demonstrated that the same potential serves as a useful approximation for many other systems, especially those of the double minimum type.
125 citations
TL;DR: In this paper, it was proved that the [N, N + J] Pade approximants to any meromorphic function converge in measure within any bounded region of the complex plane as N approaches infinity.
122 citations
116 citations
TL;DR: The results support the hypothesis that the active alcohol dehydrogenase isozymes are dimers composed of the six possible combinations of subunits coded by triplicate structural genes.
Abstract: The alcohol dehydrogenase zymogram phenotypes of 40 wheat strains, each possessing a distinctive chromosomal constitution, were determined. Genes involved in the production of alcohol dehydrogenase were located on the beta arm of chromosome 4A and on chromosomes 4B and 4D. The results support the hypothesis that the active alcohol dehydrogenase isozymes are dimers composed of the six possible combinations of subunits coded by triplicate structural genes.
107 citations
TL;DR: The interspecific chemical communication provides T. dubius with a degree of spatial synchronization of foraging and mating unusual in predator-prey systems.
101 citations
96 citations
TL;DR: In this paper, a porphyritic tonalite composition has been loaded in uniaxial stress at strain rates from 10−4 to 103/sec at temperatures of 25°C, −78°C and −191°C.
92 citations
TL;DR: The isotope data support the proposition that carbon in the sugars, proteins and lipids of sorghum is derived from the car☐yl group of oxaloacetate or malic acid by way of the C4 dicar☐ylic acid pathway.
TL;DR: The pure theory of discrimination and economic welfare is discussed in this article, where it is shown that the pure theory can be used to derive product differentiation and product differentiation can be seen as an indicator of economic welfare.
Abstract: I. Introduction, 268. — II. Discrimination and its degrees, 269. — III. The pure theory of discrimination and economic welfare, 271. — IV. Product differentiation, 275. — V. Conclusions, 277.
TL;DR: It was concluded that spontaneous alternation may be related to orientation but not to exploratory behaviour in naive goldfish, and the effects of time on these parameters in other species are assessed.
TL;DR: The theory of electromagnetic fluctuations as developed by Rytov was used to calculate the radiant power as a function of frequency radiated from a homogeneous isothermal sphere and it is shown that the emission coefficient computed is precisely equal to the absorption coefficient computed from the Mie theory.
Abstract: The theory of electromagnetic fluctuations as developed by Rytov was used to calculate the radiant power as a function of frequency radiated from a homogeneous isothermal sphere. The formula obtained is valid for all radii, frequencies, and complex dielectric constants. It is also shown that the emission coefficient computed from this theory is precisely equal to the absorption coefficient computed from the Mie theory. The formula obtained is readily adaptable to numerical calculations, and results are presented for the case of a good conducting sphere with a wide range of size parameters.
TL;DR: An algorithm based on convex programming is developed for optimum time compression in network scheduling systems that allows for the activity time-cost trade-off functions to be any differentiable convex function.
Abstract: An algorithm based on convex programming is developed for optimum time compression in network scheduling systems. The development allows for the activity time-cost trade-off functions to be any differentiable convex function. Decomposition theory is then applied to reduce the amount of computation necessary. This along with a limited number of rules to structure any incoming vector makes the algorithm amenable to time compression in large project networks.
TL;DR: Data on the thermoregulation of Anolis limifrons in Panama suggest that at least some tropical species are less warm adapted than previously thought and differences in dermal morphology in three species of Panamanian anoles are suggested to be an adaptation to varied capacities of heat gain.
Abstract: Data on the thermoregulation of Anolis limifrons in Panama suggest that at least some tropical species are less warm adapted than previously thought. Anolis limifrons has a lower minimum voluntary temperature, eccritic temperature, and critical thermal maximum than a majority of the temperate zone lizards thus far studied. Thermoregulatory adjustment is by behavioral mechanisms as indicated by observations on basking and orientation. A seasonality in the preferred temperature is indicated by field data from the wet and dry seasons. It is suggested that the lower preferred temperature in the dry season is an adaptation to conserve water or minimize water loss. Anoles (A. limifrons and A. frenatus) in colsed canopy forests are less warm adapted than the grassland A. auratus, whereas an ecotone species (A. tropidogaster) is intermediate in its thermoregulatory characteristics. Differences in dermal morphology in three species of Panamanian anoles are suggested to be an adaptation to varied capacities of heat gain.
TL;DR: In this article, the nature and sequence of deformation in the region of the maximum stress was investigated in specimens deformed in uniaxial stress compression at room temperature and at constant strain rates from 10−4/sec to 103/sec.
TL;DR: In this paper, an invariant imbedding approach was used to solve the equations of radiative transfer by solving the convexity of the radiational transfer problem, and the solution was shown to be invariant.
Abstract: This thesis is a study of the solutions of the equations of radiative transfer by an invariant imbedding approach.
TL;DR: In this paper, the effect of several variables on the extraction of sunflower seed protein has been investigated, and the optimum temperature of extraction is 45°C, although over a temperature range of 26-6°C the extraction remains essentially constant.
Abstract: SUMMARY— The effect of several variables on the extraction of sunflower seed protein has been investigated. Solubility studies on the meal show that globulin is the main protein component. Albumin, nonprotein nitrogen and insoluble nitrogen are very low. Glutelin comprises about 17% of the total nitrogen. 15 min and a meal to solvent ratio of 1:10 (w/v) were found to extract a maximum amount of protein at pH 7.0. The optimum temperature of extraction is 45°C, although over a temperature range of 26-6°C the extraction remains essentially constant. More protein was extracted by 1.0 M NaCl and 0.75 M CaCl2 at various pH's than by the higher or the lower concentrations of these salts. Results with several other salts show that concentration as well as pH is very important. Reducing agents do not appear to have any marked effect on the extractability of protein.
TL;DR: The results suggested that the disruption of auxin transport by ethylene cannot be explained in terms of a more rapid metabolism of Auxin in the treated sections.
Abstract: The effect of ethylene on the uptake, distribution, and metabolism of indoleacetic acid (IAA)-1-(14)C, IAA-2-(14)C, and naphthaleneacetic acid (NAA)-1-(14)C in cotton stem sections (Gossypium hirsutum L., var. Stoneville 213) was studied. Stem sections excised from plants pretreated with ethylene for 15 hours transported significantly less (14)C-IAA and (14)C-NAA than control sections. Concomitant features of the reduction of (14)C-IAA transport were an increase in decarboxylation and a trend toward a reduction in total uptake. With (14)C-NAA, however, total uptake was significantly increased, and decarboxylation was unaffected.(14)C-IAA was rapidly converted to indoleacetylaspartic acid and many other metabolites in both control and ethylene-pretreated stem sections. Following transport, similar amounts of (14)C-IAA were recovered in the apical absorbing portion of the control and ethylene-pretreated sections. Significantly more (14)C-IAA metabolites, however, were recovered in this region of the ethylene-pretreated sections.Conversely, (14)C-NAA was metabolized more slowly than (14)C-IAA under identical experimental conditions, with the only major metabolite being naphthaleneacetylaspartic acid. Following transport the apical absorbing portion of ethylene-pretreated stem sections contained significantly more (14)C-NAA than the controls. These results suggested that the disruption of auxin transport by ethylene cannot be explained in terms of a more rapid metabolism of auxin in the treated sections. The increased (14)C-IAA metabolites in the absorbing portion of ethylene-pretreated sections appear to be the result, rather than the cause, of the ethylene-mediated disruption of IAA transport.
TL;DR: Auf die Kupplnng mit Diazo-lH-tetrazol hat die Vorbehandlung des Enzyms with Acetylimidazol keinen Einflug, verursacht keinen AktivitXtsverlust.
Abstract: mit Diazo-lH-tetrazol erfaBt. Nur Strukturanaloge der Fumarsgure oder Apfels~iure, die mindestens noch eine Carboxylgruppe enthalten, erreichen die im aktiven Zentrum vorhandenen Histidin-Reste, wobei die DL-Brombernsteins~iure eine Ansnahme macht [3]. Erst mit einem 10000fachen {JberschuB an Diazo-lH-tetraz0i werden 2Hist idinund 3 Tyrosin-Reste erfaBt. Der mit steigendem Reagenz~berschuB zu beobachtende kontinuierliche Aktivitgtsabfall mul3 auf die Reaktion anderer im Enzym vorhandener Iunktioneiler Gruppen zuriickgeffihrt werden, die fiir die Erhaltung der aktiven I~onformation erforderlich sind; es ist unwahrscheinlich, dab das SH-Gruppen sind, da diese nach vorliegenden Untersuchungen E7] auch mit sehr reaktiven Sulfhydryl-Reagenzien nur sehr langsam reagieren. Die InaktiVierung der Fumarase durch Diazo-lH-tetrazol wird m6glicherweise durch Reaktion mit Lysin, Arginin, Serin oder Threonin hervorgerufen, die unter best immten Bedingungen farblose Kupplungsprodukte bilden kSnnen. Die Umsetzung der Fumarase mit einem 60bis 120fachen molaren {Jberschul3 an Acetylimidazol, das zur Acylierung yon OH-Gruppen des Tyrosins besonders geeignet ist [8], verursacht keinen AktivitXtsverlust. Auf die Kupplnng mit Diazo-lH-tetrazol hat die Vorbehandlung des Enzyms mit Acetylimidazol keinen Einflug.
TL;DR: In this paper, the interaction of arginine, citrulline, and ornithine with metal ions has been studied by potentiometric measurement of hydrogen ion concentration at 25° and ionic strengths of 0·10 and 1·0 M.
TL;DR: In this paper, the authors describe microfractures adjacent to faults in experimentally deformed cylinders of Westerly Granite forming as a result of shear displacement along the primary fault, and they are oriented consistently relative to the fault surface.
Abstract: Certain microfractures adjacent to faults in experimentally deformed cylinders of Westerly Granite form as a result of shear displacement along the primary fault, and they are oriented consistently relative to the fault surface. These fractures are described in detail because they are: (a) symptomatic of a homogeneous state of stress in the region of the fault at the time of faulting; (b) criteria to demonstrate that shear displacement has occurred along a fault; and (c) criteria to establish unequivocally the sense of shear.
TL;DR: The purpose of the present study was to investigate the repeatability and heritability of the composite character, reproductive efficiency of ewes, in two flocks of Rambouillet sheep.
Abstract: I MPROVEMENT in reproductive efficiency is one of the important goals with most species of farm or ranch livestock. This is especially true with sheep which seem to offer a great potential in this respect. The part that inheritance plays in reproduction of this species is not well understood. Earlier attempts to determine heritability of this character (Rendel, 1956; Young, Turner and Dolling, 1963; Purser, 1965; Singh and Rempel, 1967) have generally yielded estimates of low magnitude. However, in general, these workers have not considered the components of the composite character, reproductive efficiency of ewes, as separate entities. The purpose of the present study was to investigate the repeatability and heritability of these components in two flocks of Rambouillet sheep.
TL;DR: Rangia cuneata, a valuable clam of the estuarine zone where fluctuating salinities exclude most animals, is now developing large populations in many estuaries from Florida to Maryland.
Abstract: Rangia cuneata, a valuable clam of the estuarine zone where fluctuating salinities (from 0 to 15 parts per thousand) exclude most animals, is now developing large populations in many estuaries from Florida to Maryland. Before 1955 it was thought to be extinct on the East Coast since the Pleistocene and to be living only in Gulf Coast estuaries.
TL;DR: Bacterial counts of shrimp delivered by fishing vessels to processing plants varied greatly, and aerobic plate counts at 28 C ranged from 870–1,300,000 per gram.
Abstract: Bacterial counts of shrimp delivered by fishing vessels to processing plants varied greatly. Aerobic plate counts at 28 C ranged from 870–1,300,000 per gram. Either natural seawater or distilled water could be used in media preparation. The use of artificial seawater usually resulted in lower counts. The microbial flora of Gulf shrimp was dominated by coryneforms and species of Pseudomonas, Moraxella, and Micrococcus. Refrigerated storage usually caused an increase in Pseudomonas species. Bacterial counts of pond shrimp were much lower than those of Gulf shrimp. In some samples of pond shrimp Bacillus and Lactobacillus species were pre-dominant.
TL;DR: The trialkylstibine oxides, a poorly understood group of compounds, have now been unequivocally characterized as discussed by the authors, and the fundamental stretching frequencies v (SbO), v(SbS), v ( SbSe) and v (PTe) have been assigned in a series of compounds.
TL;DR: Among the phytohormones tested in this study, ethylene gas produced the greatest germination at low concentrations, and it appears must directly related to initiating the reactions required for converting the quiescent cells to an active state of growth.
Abstract: The germination and ethylene production by dormant Virginia-type peanut seeds were observed in relation to phytohormone treatments that could conceivably release the dormancy of these seeds. A comparison was made between the effects of these treatments on the less dormant apical seeds and the more dormant basal seeds. Indole-3-acetic acid did not stimulate ethylene production by, or germination of, the dormant seeds to any extent. Gibberellic acid at 5 x 10(-4) M stimulated ethylene production by apical seeds to 17 millimicroliters per hour and germination to only 40% above the control. The more dormant basal seeds were affected even less by gibberellic acid than the seeds. Ethylene gas at 8 microliters per liter stimulated germination to 85% above the control for both apical and basal seeds. At this ethylene concentration the physiology of the more dormant basal seeds was altered, so that they behaved in a manner similar to the inherently less dormant apical seeds. 2-Chloroethylphosphonic acid at 10(-3) and 5 x 10(-4) M provided results similar to ethylene gas. Both apical and basal seeds germinated 100% at 48 hours. Among the phytohormones tested in this study, ethylene gas produced the greatest germination at low concentrations, and it appears must directly related to initiating the reactions required for converting the quiescent cells to an active state of growth.
TL;DR: In this article, the new isotopes 221Th and 222Th have been produced in bombardments of 208Pb targets with 16O ions, from a study of the αparticle decay chains of these nuclei, activities due to 217Ra, 218Ra and 214Rn have also been observed.
TL;DR: A proteinase has been isolated from culture filtrates of Aeromonas proteolytica essentially free of the aminopeptidase activity that is present in spent media from this organism.