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Showing papers by "Mississippi State University published in 1972"



Journal ArticleDOI
TL;DR: In this article, a millimeter wave spectrometer equipped with a free space cell and on-line computer averaging has been employed to measure the absorption spectrum of H12C14N16O in the frequency range from 40 to 300 GHz.

78 citations


Journal ArticleDOI
TL;DR: In this article, the authors developed and evaluated a process by which nitrogen and phosphorus could be removed from waste water using activated algae, which is an effective nutrient and organic waste removal process, which possesses the property of bioflocculation that produces a relatively solids-free effluent.

73 citations


Journal ArticleDOI
TL;DR: The results suggest that MFO systems in freshwater fishes may be a rule rather than an exception and that previous failures to demonstrate in vitro epoxidation of aldrin may be the result of inadequate methodology.

46 citations



Journal ArticleDOI
TL;DR: Results of tests for digestive enzyme activity from mandibular and salivary glands and from foregut, midGut, and hindgut of major workers of the imported fire ant indicated a wide distribution of lipase production from these organs, thus correlating with the observed “grease‐loving” feeding habits of this insect.
Abstract: Results of tests for digestive enzyme activity from mandibular and salivary glands and from foregut, midgut, and hindgut of major workers of the imported fire ant, Solenopsis richteri Forel, indicated a wide distribution of lipase production from these organs, thus correlating with the observed “grease-loving” feeding habits of this insect. Amylase activity was present in both glands tested, but not detected in the gut. Both invertase and protease activities were apparently restricted to the midgut, with the protease activity being especially limited. Zusammenfassung VERDAUUNGSFERMENTE DER IMPORTIERTEN FEUERAMEISE, SOLENOPSIS RICHTERI (HYMENOPTERA: FORMICIDAE) An der importierten Feuerameise wurden Untersuchungen uber das Vorkommen der vier Hauptklassen von Verdauungsfermenten bei Grosarbeitern (Soldaten) ausgefuhrt. Die untersuchten Fermente waren Invertase, Diastase, Lipase und Protease, die untersuchten Verdauungsorgane Speichel- und Mandibulardrusen, Kropf, Mitteldarm und Enddarm. Um die Ferment-Aktivitat der verschiedenen Organe zu prufen, wurden als Substrate Sucrose, Starke, Castor-Ol-Emulsion und Blutfibrin benutzt und Dunnschichtchromatographie angewandt. Die Resultate zeigen besonders die weite Verbreitung der Lipase-Aktivitat, die der beobachteten Vorliebe der importierten Feuerameise fur fettreiche Nahrung entspricht. Ebenso steht die gefundene masige Invertase- und Diastase-Aktivitat in Beziehung zu den omnivoren Frasgewohnheiten dieser pradatorischen Insekten. Andererseits erwies sich die Protease-Aktivitat als besonders schwach; sie schien hauptsachlich auf den Mitteldarm beschrankt zu sein. Der geringe Grad der Protease-Aktivitat in den Drusen und im Kropf last vermuten, das bei Trophallaxis den Larven das Protein-Futter von den Arbeiterinnen in unverdautem Zustand verabreicht wird.

38 citations



Journal ArticleDOI
TL;DR: IgM, which was generally absent or very low at hatching, increased rapidly during the first week of postembryonic life, and albumin levels tended to be higher in bursectomized-irradiated birds than in control birds.

32 citations


Journal ArticleDOI
TL;DR: In this article, a mixture of flexible and rigid polyester resins was found suitable, i.e., the mixture exhibited large strains and good optical response, and the unload birefringence (fringe order immediately upon removal of load) could be used to determine strain for a uniaxial-stress field.
Abstract: The object of this investigation was to develop a technique or method for elastoplastic stress analysis using the optical effects of transparent materials. Of paramount importance was the selection and characterization of a suitable model material. In particular, it was desirable that the material be able to undergo large plastic strains while, at the same time, exhibiting a suitable level of optical response. A mixture of flexible and rigid polyester resins was found suitable, i.e., the mixture exhibited large strains and good optical response. It was found that unload birefringence (fringe order immediately upon removal of load) could be used to determine strain for a uniaxial-stress field. In particular, it provided a means for evaluating stress- and strain-concentration factors. Comparisons with other methods showed that the proposed method was reliable and gave results that are similar to those by other means. The usefulness of the material and method for two- and three-dimensional problems awaits further study.

29 citations


Journal ArticleDOI
TL;DR: Pretreatment to post-treatment reductions in snake-avoidance for the two desensitization groups were compared with each other and with pseudotherapy controls and indicated that the expectancy manipulation had no impact on the efficacy of experimental desensItization.

29 citations


Journal ArticleDOI
TL;DR: Results with sesamex, an inhibitor of mixed-function oxidase (mfo) enzymes, indicated that rotenone tolerance in mosquitofish is solely the result of increased levels of mfo enzymes.

Journal ArticleDOI
TL;DR: Phage f2 is markedly more resistant to chlorine in water than either poliovirus or coliphage T(2) and its potential use as an indicator of viral pollution is suggested.
Abstract: Phage f2 is markedly more resistant to chlorine in water than either poliovirus or coliphage T2. Its potential use as an indicator of viral pollution is suggested.

Journal ArticleDOI
TL;DR: Protein content decreased during brood production and increased during periods when brood was not present in the mound, while lipid appeared to be utilized during the cold months and glycerol appeared to increase in response to aphid tending, decreasing in winter.
Abstract: Analyses for total protein, lipids, glycogen, and glycerol were made on samples of major and minor workers of the imported fire ant, Solenopsis saevissima richteri Forel (Hymenoptera: Formicidae), which were collected over a period of one year. Protein content decreased during brood production and increased during periods when brood was not present in the mound. There was a buildup of lipid during the summer which appeared to be utilized during the cold months. Glycogen increased during the summer and may have been used for brood production when other nutrients were not abundant. Glycerol appeared to increase in response to aphid tending, decreasing in winter.

Journal ArticleDOI
TL;DR: In this article, a generalized semi-empirical equation has been developed to predict the diffusivity of binary systems as a function of pressure and temperature, and a comparison of this equation with data appearing in the literature yields and average error of 3.5%.

Journal ArticleDOI
TL;DR: The authors compared the response-elimination capabilities of omission training, in which reinforcement is contingent on the nonoccurrence of a previously reinforced response and extinction training following two different FR reinforcement training schedules.
Abstract: The present experiment compared the response-elimination capabilities of omission training, in which reinforcement is contingent on the nonoccurrence of a previously reinforced response and extinction training following 2 different FR reinforcement training schedules. Treatment of the extinction Ss was different from usual in that an empty food hopper was presented during extinction according to the respective FR reinforcement schedule. Results indicated that the omission training groups eliminated responding at a significantly faster rate than the extinction training groups. Implications for future research in this area were discussed.

Journal ArticleDOI
TL;DR: In this article, the authors trained a VI 30-sec reinforcement schedule and then either gradually or immediately switched to the final and maximum parameter values of an omission training schedule, and found that the gradual introduction procedure was more efficient since it produced significantly faster elimination of the pecking response.
Abstract: Pigeons were initially trained on a VI 30-sec reinforcement schedule and then either gradually or immediately switched to the final and maximum parameter values of an omission training schedule. Results indicated that the gradual introduction procedure was more efficient since it produced significantly faster elimination of the pecking response.



Journal ArticleDOI
TL;DR: When the distillable oil from adult boll weevils was investigated with an integrated gas chromatographymass spectrometry system, evidence was obtained for a number of mono- and sesquiterpene hydrocarbons and some substituted anilines including o -toluidine and monoterpene alcohols.



Journal ArticleDOI
TL;DR: The 1, 2-cycloaddition of nitrosoarenes to ketenimines producing 3-iminosubstituted-1,2-oxazetidines has been found to proceed more rapidly if photosensitized conditions are employed and this data allows for a reasonable postulation of the non-photochemical room temperature reaction.



Journal ArticleDOI
TL;DR: The alternative strategies of assimilation, separation, or out-migration which face most rural minority populations are discussed in this article in light of the Mississippi Choctaw experience, where a combination of employment opportunity, White attitudes, and community size seem to determine which strategy will predominate in a given ChoCTaw community.
Abstract: The alternative strategies of assimilation, separation, or out-migration which face most rural minority populations are discussed in light of the Mississippi Choctaw experience. Existing in a local society dichotomized between White and Black, the Choctaw response has been similar to that of mestizo groups described by Berry. A combination of employment opportunity, White attitudes, and community size seem to determine which strategy will predominate in a given Choctaw community.

Journal ArticleDOI
TL;DR: The 1,2-cycloaddition of unsymmetrical azobenzenes has been found to be stereoselective and the rate is essentially solvent independent, leading to the postulation of a near concerted process which encounters a steric effect after alignment.

Journal ArticleDOI
TL;DR: The in vivo studies indicate a significant difference in retention between brains from susceptible and resistant fish and point to a membrane barrier to DDT in tissues from resistant fish.

30 Apr 1972
TL;DR: The design is considered of a computer-aided-compensator for a control system from a frequency domain point of view based on describing the open loop frequency response by n discrete frequency points which result in n functions of the compensator coefficients.
Abstract: The design is considered of a computer-aided-compensator for a control system from a frequency domain point of view. The design technique developed is based on describing the open loop frequency response by n discrete frequency points which result in n functions of the compensator coefficients. Several of these functions are chosen so that the system specifications are properly portrayed; then mathematical programming is used to improve all of these functions which have values below minimum standards. To do this, several definitions in regard to measuring the performance of a system in the frequency domain are given, e.g., relative stability, relative attenuation, proper phasing, etc. Next, theorems which govern the number of compensator coefficients necessary to make improvements in a certain number of functions are proved. After this a mathematical programming tool for aiding in the solution of the problem is developed. This tool is called the constraint improvement algorithm. Then for applying the constraint improvement algorithm generalized, gradients for the constraints are derived. Finally, the necessary theory is incorporated in a Computer program called CIP (compensator Improvement Program). The practical usefulness of CIP is demonstrated by two large system examples.