Showing papers by "Kent State University published in 1980"
TL;DR: Electrophysiological field potentials from hippocampal slices of rat brain show sex-linked differences in response to 1 X 10(-10)M concentrations of estradiol and testosterone added to the incubation medium.
Abstract: Electrophysiological field potentials from hippocampal slices of rat brain show sex-linked differences in response to 1 X 10(-10)M concentrations of estradiol and testosterone added to the incubation medium. Slices from male rats show increased excitability to estradiol and not to testosterone. Slices from female rats are not affected by estradiol, but slices from female rats in diestrus show increased excitability in response to testosterone whereas slices from females in proestrus show decreased excitability.
309 citations
TL;DR: The crystal structure of Escherichia coli tRNAfMet an initiator transfer RNA, has been determined, and while grossly similar to that of the chain-elongating yeast tRNAPhe, there are three major differences.
Abstract: The crystal structure of Escherichia coli tRNAfMet an initiator transfer RNA, has been determined. While grossly similar to that of the chain-elongating yeast tRNAPhe, there are three major differences. One involves the folding of the anticodon loop; in particular, the position of the constant uridine, U33. This difference was unexpected and may be of functional significance.
196 citations
25 Nov 1980
TL;DR: A unique transfer RNA has been identified in human and bovine mitochondria that lacks the "dihydrouridine" loop and stem structure and can be aminoacylated with serine when purified mitochondria are incubated in a medium containing 3H-serine.
Abstract: A unique transfer RNA has been identified in human and bovine mitochondria that lacks the "dihydrouridine" loop and stem structure. This tRNA is mitochondrially coded as shown by DNA sequence analysis of the human and bovine mitochondrial DNA. Sequence analysis of the RNA shows that it is post-transcriptionally modified by the addition of CCA at the 3' terminus and that at least one base is modified. As predicted by its anticodon (GCU, corresponding to the serine codons AGU/C) this tRNA can be aminoacylated with serine when purified mitochondria are incubated in a medium containing 3H-serine.
125 citations
TL;DR: This paper presents a new algorithm for solving the assignment problem based on a scheme of relaxing the given problem into a series of simple network flow transportation problems for each of which an optimal solution can be easily obtained.
Abstract: This paper presents a new algorithm for solving the assignment problem. The algorithm is based on a scheme of relaxing the given problem into a series of simple network flow transportation problems for each of which an optimal solution can be easily obtained. The algorithm is thus seen to be able to take advantage of the nice properties in both the primal and the dual approaches for the assignment problem. The computational bound for the algorithm is shown to be 0n3 and the average computation time is better than most of the specialized assignment algorithms.
99 citations
Journal Article•
TL;DR: The thermal-compositional dependence of Fe2*-Mg distributions between coexisting gar-net and pyroxene in diverse metamorphic lithologies from two small areas in the Ruby Range, southwestern Montana, has been studied by electron microprobe and multiple linear regression techniques as mentioned in this paper.
Abstract: The thermal-compositional dependence of Fe2*-Mg distributions between coexisting gar- net and pyroxene in diverse metamorphic lithologies from two small areas in the Ruby Range, southwestern Montana, has been studied by electron microprobe and multiple linear regression techniques. For coexisting garnet-clinopyroxene, this dependence, which is in- ferred from indepindent metamorphic P-Testimates for two areas and thirteen mineral-pair analyses, is surnrnarized by the equation Rf h KD : Q482!845) + (1509i1392)(X."-X'Jo"
98 citations
TL;DR: Comparisons of two-dimensional polypeptide patterns for liver microsomes from phenobarbital- induced, 3-methylcholanthrene-induced, and noninduced rats revealed differences mainly in putative cytochrome P -450 polypePTides.
74 citations
TL;DR: Simulation experiments evaluating the functional correlates of topographic diversity in zygomatic root position and mandibular ramus height in early hominids indicated that the mandibles and dentitions of robust australopithecines are well adapted to sustain high magnitude, low gradient load distributions.
Abstract: Reconstructing the biomechanics of early hominid mastication is a key element in most models of hominid differentiation. Traditionally, ostelogical features marking muscle attachment surfaces have served as a reference system from which the vector geometry of the masticatory force system and resultant force distributions could be predicted. To augment traditional morphological and computational approaches, we developed a simulation system capable of replicating human and non-human primate chewing motions. The forces of occlusion are recorded as photoelastic fringes in a urethane alveolar process. Simulation experiments evaluating the functional correlates of topographic diversity in zygomatic root position and mandibular ramus height in early hominids indicated that the mandibles and dentitions of robust australopithecines are well adapted to sustain high magnitude, low gradient load distributions.
71 citations
TL;DR: In this article, the tilt angle and the planar spacing near the second order of the second-order transition were measured in the presence of a simple molecular-tilt model for the transition, and it was shown that the true critical region should be unobservably small for most $A\ensuremath{-}C$ transitions.
Abstract: We report measurements of the tilt angle $\ensuremath{\Phi}$ and the planar spacing ${d}_{C}$ near the second-order $\mathrm{Sm}C\ensuremath{-}\mathrm{Sm}A$ transition in $4\ensuremath{-}n\ensuremath{-}\mathrm{pentyl}\ensuremath{-}\mathrm{phenylthiol}\ensuremath{-}{4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\mathrm{octyloxybenzoate} (8\overline{S}5)$. We find that the ratio $\frac{\ensuremath{\Phi}}{invcos}(\frac{{d}_{C}}{{d}_{A}})$ is constant (1.2 \ifmmode\pm\else\textpm\fi{} 0.1) through the $C$ phase, supporting a simple molecular-tilt model for the transition. For $5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}g1\ensuremath{-}\frac{T}{{T}_{c}}g3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, $\ensuremath{\Phi}$ exhibits mean-field behavior. A simple Ginzburg-criterion argument indicates that the true critical region should be unobservably small for most $A\ensuremath{-}C$ transitions.
66 citations
TL;DR: The spin-flip isovector giant resonance (SISV) was observed to carry a significant fraction of the Gamow-Teller strength in this article, which is consistent with both a recent shell-model prediction and with the position expected from systematics.
Abstract: Neutron spectra from the reaction $^{48}\mathrm{Ca}$($p$,$n$) $^{48}\mathrm{Sc}$ at 160 MeV reveal a prominent narrow peak at ${E}_{x}=16.8$ MeV. This state is interpreted as a spin-flip isovector giant resonance; it carries a significant fraction of the ${T}_{g}$ ($T=4$) Gamow-Teller strength. The observed position of this resonance agrees with both a recent shell-model prediction and with the position expected from systematics for the analog of the giant $M1$ resonance in $^{48}\mathrm{Ca}$.
64 citations
59 citations
Journal Article•
TL;DR: In this paper, the effect of temperature on the precision of retention measurements in liquid chromatography was examined for a number of chromatographic systems, including reversed-phase and normal-phase systems.
TL;DR: In this paper, the effectiveness of lake drawdown as a management or restoration technique for controlling macrophytes in eutrophic lakes is reviewed for effectiveness, longevity, and positive and negative impacts.
Abstract: Lake drawdown as a management or restoration technique for controlling macrophytes in eutrophic lakes is reviewed for effectiveness, longevity, and positive and negative impacts. Drawdown can be effective but is species specific, and some nuisance plants are resistant or stimulated. The responses of 63 nuisance plants are reviewed. Advantages of the technique include low cost, absence of toxic chemicals, enhancement of fisheries, and the opportunity to carry out other lake improvements. Drawbacks include nutrient release, algal blooms, low dissolved oxygen, lake user dissatisfaction during the process, and failure to refill. The technique is recommended for situations where susceptible species are the major nuisance and where prolonged (1–2 months) dewatering of sediments under rigorous conditions of heat or cold is possible.
TL;DR: A sex role congruency hypothesis concerning the relationship between subordinates' perceptions of leaders' behavior and subordinates' job satisfaction was tested in a public assistance and social s... as mentioned in this paper,.
Abstract: A sex-role congruency hypothesis concerning the relationship between subordinates' perceptions of leaders' behavior and subordinates 'job satisfaction was tested in a public assistance and social s...
TL;DR: In recent years, Mexico has demonstrated the capacity to cultivate, process, ship, and transship vast quantities of illegal narcotic drugs as mentioned in this paper, and this activity has traditionally been geared to the realities of domestic poverty, enormous profit, and American demand.
Abstract: In recent years Mexico has demonstrated the capacity to cultivate, process, ship, and transship vast quantities of illegal narcotic drugs. Such activity has traditionally been geared to the realities of domestic poverty, enormous profit, and American demand. Mexican marijuana dominated the U.S. market until quite recently. More importantly from the American viewpoint were the tons of Mexican heroin which saturated U.S. cities in the mid-1970s. Furthermore, Mexico is still the source of vast quantities of psychotropics and an increasingly popular conduit for South American cocaine. According to Craig (1978), U.S. officials long sought to convince their Mexican counterparts that the key to any effective antidrug program lay in eliminating the illicit product at the source. Until such time that herbicides were applied on a massive scale against marijuana and opium poppies, they argued, the annual Mexican campaign would prove an exercise in futility.
TL;DR: Petrologically characterisation of cataclastic rocks derived from four sites within the San Andreas fault zone of southern California has been performed by as mentioned in this paper, showing that they are essentially a rock flour with a quartz, feldspar, biotite, chlorite, amphibole, epidote and oxide mineralogy.
TL;DR: In this paper, the authors investigated the construct validity of commonly used semantic differential scales for the measurement of source credibility and concluded that the evidence supports the construct validations of the scales.
Abstract: This study investigates the construct validity of commonly used semantic differential scales for the measurement of source credibility. Criticisms of the scales are first reviewed. This suggests a need for construct validity research. The process of construct validation is then explained. The source credibility construct is placed in a nomological network and hypotheses are derived and tested. The results are examined, and the claim is advanced that the evidence supports the construct validity of the scales. Implications of the results are discussed.
TL;DR: In this paper, the angular and energy distributions from 710-MeV alphas stopping in targets of water, carbon, steel, and lead for neutron energies from 3 MeV to above 300 MeV were measured.
Abstract: We measured neutron angular and energy distributions from 710-MeV alphas stopping in targets of water, carbon, steel, and lead for neutron energies from 3 MeV to above 300 MeV. We also measured neutron spectra from 640-MeV alphas stopping in lead. These spectra are similar to the 710-MeV spectra but are reduced in magnitude by about 20 percent. The angular distributions are forward peaked and have a broad bump at about 120 MeV in the 0- and 6-degree spectra. The 710-MeV integrated yields above 10 MeV are about 0.5 neutron per incident alpha, independent of the target. The measured spectra from the water target are consistent with the calculations of an intranuclear cascade model at the forward angles, but are larger than the calculations at the backward angles.NUCLEAR REACTIONS ${\mathrm{H}}_{2}$O, C, steel, Pb($\ensuremath{\alpha}$,$\mathrm{xn}$), $E=710$ MeV; Pb($\ensuremath{\alpha}$,$\mathrm{xn}$), $E=640$ MeV. Measured unidirectional spectra and yields from thick targets. Deduced total integrated neutron yields above 10 MeV. Compared spectra with intranuclear-cascade model.
TL;DR: An enhanced gcd algorithm based on the EZ-GCD algorithm is described, which is generally faster and is particularly suited for computing gcd of sparse multivariate polynomials.
Abstract: An enhanced gcd algorithm based on the EZ-GCD algorithm is described. Implementational aspects are emphasized. It is generally faster and is particularly suited for computing gcd of sparse multivariate polynomials. The EEZ-GCD algorithm is characterized by the following features:(1) avoiding unlucky evaluations,(2) predetermining the correct leading coefficient of the desired gcd,(3) using the sparsity of the given polynomials to determine terms in the gcd and(4) direct methods for dealing with the "common divisor problem." The common divisor problem occurs when the gcd has a different common divisor with each of the cofactors. The EZ-GCD algorithm does a square-free decomposition in this case. It can be avoided resulting in increased speed. One method is to use parallel p-adic construction of more than two factors. Machine examples with timing data are included.
TL;DR: Despite the unusual potency of hyperthermia as an amnestic agent, the attenuation of the amnesia by reminder treatment suggested an interpretation consistent with a general retrieval-oriented theory.
TL;DR: Uterotrophic, as well as glycogenic effects occurred without estrogen priming, although synergism of the two hormones was observed; this suggests that relaxin receptor concentrations in the uterus may be, to some degree, estrogen dependent.
Abstract: Summary Purified, electrophoretically homogeneous porcine relaxin (1750 GPU/mg) increased uterine glycogen in both unprimed and estrogen-primed ovariectomized rats. In estrogen-primed animals the glycogenic response was linear with the logarithm of the dose from 3 to 30 μg/animal; in unprimed animals the effect of 10 μg was essentially the same as that achieved with 30 μg. Relaxin also increased wet and dry uterine weights and total nitrogen content, indicating true uterine growth. Uterotrophic, as well as glycogenic effects occurred without estrogen priming, although synergism of the two hormones was observed; this suggests that relaxin receptor concentrations in the uterus may be, to some degree, estrogen dependent. Relaxin did not affect the concentrations of diaphragm glycogen or plasma glucose; thus the direct effects of relaxin appear to be limited to control of metabolic events in the female reproductive system in a manner similar to insulin regulation of general body metabolism.
TL;DR: In this paper, the negotiation paradigm is used to analyze interorganizational relations leading to the development of a complex of eleven rehabilitation agencies, based on records over a two-and-a-half year period.
Abstract: Strauss' (1978) negotiation paradigm is used to analyze interorganizational relations leading to development of a complex of eleven rehabilitation agencies. Analysis is based on records over a twen...
Journal Article•
01 Jan 1980
TL;DR: In this paper, the authors analyzed sixty-four scan lines representing diverse conditions across satellites, channels, scanners, locations and cloud cover and found that Landsat data are autocorrelated and consistently follow an Arima (1-0-1) pattern.
Abstract: Analysis of sixty-four scan lines representing diverse conditions across satellites, channels, scanners, locations and cloud cover confirms that Landsat data are autocorrelated and consistently follow an Arima (1,0,1) pattern. The AR parameter varies significantly with location and the MA coefficient with cloud cover. Maximum likelihood classification functions are considerably in error unless this autocorrelation is compensated for in sampling.
TL;DR: It was suggested that although the combined hormone/behavioral reactivation treatment may extend the duration of ACTH-induced recovery from amnesia, a reactivated memory, like other memories, appears susceptible to ordinary sources of retention loss.
TL;DR: In this paper, the authors extended the AMM method for estimating the benefit distributions associated with the provision of pure public goods to cover the case of public projects designed to improve the quality of impure public goods, and the extended method was used to estimate the distributional impact of a proposed public project in the Cleveland-Akron metropolitan region.
Abstract: Aspects of the method developed by Aaron and McGuire and Maital (AMM) for estimating the benefit distributions associated with the provision of pure public goods are clarified and the method is extended to cover the case of public projects designed to improve the quality of impure public goods The extended method is used to estimate the distributional impact of a proposed public project in the Cleveland-Akron metropolitan region, and the results are compared with estimates obtained from three naive models and from the AMM model for pure public goods It is found that the native models overestimate substantially the net benefits received by low-income families and underestimate the net benefits received by high-income families Using the AMM method for a pure public good similarly distorts the results, though by a much smaller magnitude
TL;DR: In the legumes several pollen types were encountered during a survey of the Caesalpinioideae that were previously unknown or poorly known for the subfamily: Viscin threads, periporate pollen, diporate pollen with a single continuous colpus, tetracolporate pollen (Ceratonia), and pollen tetrads (Afzelia, Diptychandra).
Abstract: In the legumes several pollen types were encountered during a survey of the Caesalpinioideae that were previously unknown or poorly known for the subfamily: Viscin threads (Jacqueshuberia), periporate pollen (Hardwickia, Colophospermum), diporate pollen with a single continuous colpus (Duparquetia), tetracolporate pollen (Ceratonia), and pollen tetrads (Afzelia, Diptychandra).