Showing papers by "Oklahoma State University–Stillwater published in 1978"
482 citations
TL;DR: Two arguments are presented, one thermodynamic and one microscopic, which suggest that the permeability of pure lipid vesicles and dispersions is proportional to the lateral compressibility, and two previously published theoretical models are calculated.
227 citations
01 Jan 1978
TL;DR: For continuous-time nonlinear deterministic system models with discrete nonlinear measurements in additive Ganssian white noise, the extended Kalman filter (EKF) convariance propagation equations linearized about the true unknown trajectory provide the Cramer-Rao lower bound to the estimation error covariance matrix as discussed by the authors.
Abstract: For continuous-time nonlinear deterministic system models with discrete nonlinear measurements in additive Ganssian white noise, the extended Kalman filter (EKF) convariance propagation equations linearized about the true unknown trajectory provide the Cramer-Rao lower bound to the estimation error covariance matrix. A useful application is establishing the optimum filter performance for a given nonlinear estimation problem by developing a simulation of the nonlinear system and an EKF linearized about the true trajectory.
199 citations
TL;DR: Observations confirm the sigmoidal relationship between PTH secretion rate and plasma calcium concentration which was previously suggested by measurement of PTH concentration in peripheral plasma of hypocalcemic, parturient cows.
Abstract: Parathyroid hormone (PTH) secretion rate was measured in 16 anesthetized calves by using a technique involving radioimmunoassay of parathyroid venous blood which was collected during timed intervals and measured volumetrically. The calves ranged in age from 2–14 weeks. Plasma calcium concentration was altered by infusion of solutions of CaCb or disodium ethylenediamine tetracetate (Na2 EDTA) into the jugular vein. When plasma calcium concentrations exceeded 10.5 mg/100 ml, a basal, non-suppressible secretion rate of 0.3 ng/kg/min was maintained despite the induction of hypercalcemia. Slight changes in secretion rate were observed in response to changes of plasma calcium in the range between 9 and 10.5 mg/100 ml. Below 9 mg/100 ml, a small decrease in plasma calcium concentration evoked a pronounced increase in secretion rate. A maximal secretion rate of about 5.5 ng/kg/min was attained at a plasma calcium concentration of approximately 7.5 mg/100 ml and it was not increased by more severe hypocalcemia. Th...
162 citations
TL;DR: In this article, the authors examined factors related to the time husbands and wives spent in housework, including employment status, family size, and spouse's employment characteristics, and found that the most im portant factor which placed a constraint upon the wife's housework hours was time spent in the labor force, while family size served as a pressure to increase housework time.
Abstract: This study examined factors related to the time husbands and wives spent in housework. The sample consisted of 1,156 structurally intact families in which the spouses were able-bodied and less than 65 years of age. Data were from the Panel Study of Income Dynamics. Multiple regression analysis was the statistical procedure used in this study. Variables related to wife's housework time were her employment status, family size, and husband's employment characteristics. The most im portant factor which placed a constraint upon the wife's housework hours was time spent in the labor force, while family size served as a pressure to increase housework time. Husbands allocated relatively little time to housework and a low level of explained variance in husband's housework hours was achieved. Husband's employment limited his time inputs to housework. Wife's average hourly earnings and wife's labor force hours were positively related to husband's housework hours, although the impact was quite modest. Consideration was given to the reciprocal relationship be tween husband's and wife's role performance and possible implications for family time manage ment.
86 citations
TL;DR: Several example spectra of Nd(III) are presented with emphasis on the effects of the fluorescence-lifetime in Nd:glass laser material.
Abstract: Piezoelectric detection of photoacoustic signals offers a number of advantages over the better known microphonic technique for condensed phase samples. Experimental techniques are greatly simplified by taking advantage of the acoustic impedance match offered by solid state detectors with solid or liquid samples. Such piezoelectric detectors prove suitable for ac steady state measurements as well as impulse-transient response detectors. Several example spectra of Nd(III) are presented with emphasis on the effects of the fluorescence-lifetime in Nd:glass laser material.
85 citations
83 citations
TL;DR: In this article, a comparison with experiment is made of the several versions of the theory for the dielectrophoretic force exerted by non-uniform electric fields upon a neutral object.
Abstract: Because of the increasing use of dielectrophoresis in the dielectric characterization and sorting of living cells or their parts, it has become important to establish carefully the theoretical backgrounds for this effect. A comparison with experiment is made of the several versions of the theory for the dielectrophoretic force exerted by nonuniform electric fields upon a neutral object. The three fundamental approaches: the Maxwell-Strattonstress tensor, the effective dipole moment, and the ‘Helmholtz’ energy approach are presented along with the general solution given earlier by Pohl and Crane. These are found to agree closely with experiment in predicting the dielectrophoretic force upon various rods hung in specially shaped (isomotive) field distributions. On the other hand, an alternative formulation based upon a debatable assignment of fields local to the dipoles gave a good fit to the experimental data only for materials of very low permittivity, and fitted poorly in the case of highly polarizable materials. An improved derivation of the theory for stable dielectrophoretic levitation is also presented. This phenomenon is of particular interest in that it is based upon an apparent violation of the Earnshaw's theorem, and is useful in the study of the dielectric properties of individual living cells.
83 citations
TL;DR: The data strongly suggest an extrathyroidal conversion of T 4 to T 3 in this experiment, which would explain why T 4 and T 3 were undetectable in plasma of the thyroidectomized drake.
61 citations
54 citations
TL;DR: In this article, generalized solutions of second order elliptic equations for which the coefficients of the differential operator and the nonhomogeneous term satisfy a Dini criterion were shown to be essentially classical solutions and a bound for the modulus of continuity of second-order partial derivatives of the solution was established.
TL;DR: In this paper, the authors proposed that magnesium vacancies act as the stabilizing site for the O-2 molecules, which are formed when oxygen interstitials produced by the radiation combine with indigenous oxygen ions.
TL;DR: Results suggest an extensive complex of cytoskeletal proteins attached to the membrane interior surface of Sarcoma 180 ascites cells, which can be eluted at high salt concentrations if the envelopes have been previously extracted and fragmented with alkaline buffer.
TL;DR: The observations indicate that the effect of magnesium on PTH secretion rate is similar to that of calcium, but not equipotent, as well as that observed with changes in plasma calcium concentration.
Abstract: Parathyroid hormone (PTH) secretion rate was measured in seven calves by using a technique which involved RIA of parathyroid venous blood collected during timed intervals and measured volumetrically. Infusion of solutions of NA2EDTA and MgCl2 into the jugular vein was used to alter plasma calcium and magnesium concentrations. In four calves, elevation of plasma magnesium concentration rapidly decreased the PTH secretion rate that had been stimulated by induced hypocalcemia. In three calves, equimolar and opposite changes in plasma calcium and magnesium concentrations were induced by simultaneous infusions of Na2EDTA and MgCl2. Despite the equimolar increase in plasma magnesium concentration, PTH secretion was increased in response to the decline in plasma calcium concentration. In three experiments, the concentration of each cation was kept constant during periods in which the concentration of the other cation was varied. The effect of variations in plasma magnesium concentration on PTH secretion rate was approximately 1/3-1/2 as great as that observed with changes in plasma calcium concentration. These observations indicate that the effect of magnesium on PTH secretion rate is similar to that of calcium, but not equipotent.
TL;DR: In this paper, a new method for the measurement of the primary fluorescence quantum yield of dye solutions is presented, relying of the S n → S 1 transition probability as an internal standard for comparison with the S 1 radiationless transition probability, both probabilities being measured by photoacoustic spectroscopy.
TL;DR: Changes in the rate of palmitate oxidation with age tended to parallel changes in the level of mitochondrial protein per g of wet tissue and suggested an increased ability to utilize fat as an energy substrate during early development of the neonatal pig.
Abstract: A total of 35 pigs were obtained by cesarean section, placed in individual sterile isolators, and randomly allotted to treatment groups. Thirty pigs received purified, isoenergetic liquid diets containing 2 or 32% butterfat (dry matter basis) and were killed at 1, 7, or 21 days of age. Five pigs were killed at 2 hours post delivery and received no diet. Twenty-one-day old pigs showed a tendency for higher weight gain and feed consumption when consuming the 32% fat diet although the differences were not significant. The rate of oxidation of [U-14C]palmitate to CO2 and acid soluble products was measured in homogenates of liver, kidney, heart, and leg muscle (biceps femoris) from pigs 0, 1, 7, and 21 days of age. The relative rates of oxidation of [U-14C]myristate, [U-14C]palmitate, and [U-14C]stearate were measured in homogenates of liver from 7-day old pigs. Palmitate oxidation was stimulated by carnitine in all four tissues and the rate of carnitine-stimulated palmitate oxidation to acid soluble products in heart and to CO2 in liver was higher in tissues from pigs consuming the 32% fat diet. The rate of palmitate oxidation increased with age in liver, kidney and leg muscle tissues and was maximum at 21 days in kidney and leg muscle and at 7 days in liver. The rate of palmitate oxidation in heart tended to decrease with animal age. In homogenates of liver from 7-day old pigs, palmitate was oxidized at a faster rate than stearate or myristate. The activities of carnitine palmitoyltransferase (CPT) (EC 2.3.1a) and succinate dehydrogenase (EC 1.3.99.1) in mitochondria isolated from liver, kidney, heart, and leg muscle did not vary considerably with age although CPT activity tended to be higher in those tissues from pigs consuming the high fat diet. Changes in the rate of palmitate oxidation with age tended to parallel changes in the level of mitochondrial protein per g of wet tissue and suggested an increased ability to utilize fat as an energy substrate during early development of the neonatal pig.
TL;DR: In this paper, a method for the analysis of the free vibrations of a circular cylindrical shell with a longitudinal, interior plate is developed, based on the extended Rayleigh-Ritz technique.
TL;DR: In this paper, the stock price behavior of most developed countries has been known to follow the random walk process, eg, in Fama's (3) study on US stocks, Soinik (7), Theil and Leenders (8), and Dryden's (2) work on European stocks An interesting result emerges from the comparison of these studies: that although the random-walk hypothesis would adequately depict the behavior of European stock markets, the deviation from a random walk is more apparent in European exchanges than in the US stock markets.
Abstract: * The stock price behavior of most developed countries has been known to follow the random walk process, eg, in Fama's (3) study on US stocks, Soinik (7), Theil and Leenders (8), and Dryden's (2) work on European stocks An interesting result emerges from the comparison of these studies: that although the random walk hypothesis would adequately depict the behavior of European stock markets, the deviation from a random walk is more apparent in European exchanges than in the US An accepted explanation takes into account the differences in the institutional characteristics of the two markets; such as, stringencies of disclosure requirements, control on inside trades, thinness of markets, and discontinuities of trading, etc (7) If the degree of "structure" or "organization" affects the degree of conformity to the random walk process, then we should expect countries, whose stock exchanges are not as "organized" as the European or US exchanges-eg, lesser degree of regulations or disclosure requirements-to exhibit greater deviation from a random price behavior Consequently, it would be interesting to see the results if similar tests were performed on stock prices from nonUS or European exchanges In the following, we will discuss results of serial correlation for five Far Eastern countries: Australia, Hong Kong, Japan, Philippines, and Singapore These results are then compared to those of the previous studies on US and European stocks
TL;DR: In this paper, the shape needed to produce dielectrophoretic force upon neutral bodies in non-uniform electric fields is discussed and the shape can be arranged readily to produce a force which varies as r n, where n = −3 to +3, and r is the radial coordinate.
TL;DR: Geometric isomers of retinoic acid and methyl retinoate were separated by high-performace liquid chromatography on bonded, reversed-phase, octadecylsilane columns using methanol-water mixtures as solvents as discussed by the authors.
01 Jan 1978
TL;DR: Hairy vetch poisoning (vetch-associated disease) of cattle is a generalized disease characterized pathologically by infiltration of skin and many internal organs by monocytes, lymphocytes, plasma cells, and often eosinophils and multinucleated giant cells and clinically by dermatitis, pruritus, often diarrhea, wasting, and high mortality.
Abstract: I. ABSTRACT A disease of cattle, apparently associated with the ingestion of hairy vetch (Vicia villosa Roth), was observed in 23 herds. Clinically, the disease was characterized by dermatitis, conjunctivitis, diarrhea, and other less prominent signs. The morbidity was 6 to 8%, and the mortality approached 50% of clinically affected animals. Pathologic changes consisted basically of extensive infiltration of many organs by lymphoreticular cells, plasma cells, multinucleated giant cells, and eosinophils.
TL;DR: Tryptophan and alanine were most effective for growth and sporulation of B. bassiana , although glutamine and KNO 3 also produced large numbers of regularly shaped spores, and Nitrogen sources containing sulfur were poorly utilized for sporulation by M. anisopliae.
TL;DR: An adult nematode having morphologic features of the meningeal worm (Parelap hostrongylus tenuis) was found in the brain of one llama andLesions in the central nervous system of both llamas appeared to have been caused by a migrating parasite.
Abstract: Four of 11 llamas (Lama guanicoe) from a ranch near Houston, Texas developed clinical signs of a neurologic disease. Tissues from 2 of the 4 llamas were submitted for microscopic examination. Lesions in the central nervous system of both llamas appeared to have been caused by a migrating parasite. An adult nematode having morphologic features of the meningeal worm (Parelap hostrongylus tenuis) was found in the brain of one llama. The findings suggest that the neurologic disease in the llamas were caused by P. tenuis.
TL;DR: In this article, the authors investigated host-sensitized energy transfer in YVO4 crystals doped with Eu3+ and Er3+ ions using laser excited time-resolved spectroscopy techniques.
01 Jan 1978
TL;DR: The proposed roles of alkaloids in plant metabolism, plant catabolism, or plant physiology are (1) end products of metabolism or waste products, (2) storage reservoirs of nitrogen, (3) protective agents for the plant against attack by predators, (4) growth regulators, or (5) substitutes for minerals in plants.
Abstract: The proposed roles of alkaloids in plant metabolism, plant catabolism, or plant physiology are (1) end products of metabolism or waste products, (2) storage reservoirs of nitrogen, (3) protective agents for the plant against attack by predators, (4) growth regulators (since structures of some of them resemble structures of known growth regulators), or (5) substitutes for minerals in plants, such as potassium and calcium (according to Justus von Liebig (1840, 1841). Of these items, (2) and (5) appear to be the least promising, and are not considered further here, but the other items, as well as new concepts, will be discussed in this chapter. There are several reviews of the raison d ’etre of secondary compounds (Errera, 1887; James, 1950; Mothes, 1953, 1966, 1969; Fraenkel, 1959, 1969; Bu’Lock, 1961, 1965; Mothes and Schuette, 1969; Geissman and Crout, 1969; Weinburg, 1971; Luckner, 1972; Robinson, 1974).
TL;DR: The role of the school psychologist in identification of the gifted student is discussed in this article, where the authors discuss the importance of the psychological evaluation of a student in the selection of a special education class.
Abstract: School curricula are changing, most notably in the field of special education. One area which is increasingly receiving more emphasis is gifted education. The gifted student, who has too long been overlooked, is now eligible for placement in special education classes designed to further the development of his unique abilities. The role of the school psychologist in identification of the gifted student is discussed.
TL;DR: In this article, the effect of rate proportionality constants on three fundamental parameters, which limit sensitivity as well as determination rate in sample injection (for repetitive determinations) into unsegmented (single-phase) flow-through systems, is discussed.