4,277 research outputs found

    A spectrophotometric study of blood group A-specific substance isolated from hog gastric mucosa

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    A study of the ultraviolet absorption spectra of preparations of blood group A-specific substance isolated from hog gastric mucin supports the view that group A substance, and probably group O substance, has little specific absorption in this spectral region and that other components account for most if not all of the specific absorption noted in the case of impure preparations. However, ultraviolet spectrophotometric analyses have been found to be particularly useful in following changes in composition brought about by the fractionation of group A substance preparations obtained from hog gastric mucin as well as in comparing preparations isolated by different methods and from different sources. Such analyses have also indicated that tyrosine and tryptophan, if indeed present in group A substance, are but minor constituents

    The colorimetric determination of hexoses with carbazole

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    The optimum conditions for the calorimetric estimation of hexoses by reaction with carbazole in hot sulfuric acid solution have been determined and a convenient procedure, giving results with a precision of 2 to 5 per cent in the range of 50 to 150 γ of glucose, is described. The colors obtained with glucose, galactose, fructose, and mannose are not sufficiently distinctive to allow their ready differentiation and identification by spectral measurements. The significance of the ultraviolet spectra of heated and unheated sulfuric acid solutions of hexoses to the problem of estimation and identification of hexoses is discussed

    A Historical Overview of Church Growth Consulting

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    My longtime friend and colleague, Alan McMahan, asked for an article that would sum up my observations of Church Growth consulting over the past twenty-five years. He wanted it to be helpful to practitioners

    A Response to Dr. Litfin

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    A response to Duane Litfin\u27s (1995) Understanding Your Critics: An Outsider’s Analysis of a Core Criticism of the Church Growth Movement (in this issue)

    A Response to Dr. Litfin

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    A response to Duane Litfin\u27s (1995) Understanding Your Critics: An Outsider’s Analysis of a Core Criticism of the Church Growth Movement (in this issue)

    A Historical Overview of Church Growth Consulting

    Get PDF
    My longtime friend and colleague, Alan McMahan, asked for an article that would sum up my observations of Church Growth consulting over the past twenty-five years. He wanted it to be helpful to practitioners

    A convenient telescope performance metric for imaging through turbulence

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    This paper provides an overview of the various image quality metrics used in astronomical imaging and explains in details a new metric, the Normalized Point Source Sensitivity. It is based on the Equivalent Noise Area concept, an extension of the EE80% metric and is intuitively linked to the required science integration time. As it was proved in recent studies, the PSSN metric properly accounts for image degradation due to the spatial frequency content of a given telescope aberration and the effects of various errors can be multiplicatively combined, like those expressed in Central Intensity Ratio. Extensions of the metric for off-axis imaging and throughput degradation are presented. Wavelength and spatial frequency dependence of PSSN are discussed. While the proper calculation of the PSSN metric requires the precise knowledge of the PSF of both the optics and atmosphere, there is a straightforward approximation linking PSSN to the Zernike decomposition of the OPD. Besides the summary of various aspects of the Point Source Sensitivity, the paper provides many numerical examples derived for the Thirty Meter Telescope

    The Effects of Class-Wide Function-related Intervention Teams (CW-FIT) on Students' Prosocial Classroom Behaviors

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    Students with challenging, disruptive behavior have difficulty learning in school and their behavior adversely impacts the learning of other students and the classroom teacher. Class-Wide Function-related Intervention Teams (CW-FIT) is a promising approach that teachers can use to prevent and reduce problem behavior and increase prosocial classroom behaviors. Previous studies have demonstrated that CW-FIT produced improvements in student appropriate classroom behaviors which led to increased available instruction time. The purpose of this investigation was to systematically replicate CW-FIT adding to the empirical research base supporting it. A novel aspect compared to prior studies was measurement of the behaviors actually reduced and increased by CW-FIT, providing a new contribution to the literature. Students in four classes and their teachers participated in this study. An ABAB reversal design combined with a multiple baseline design was used to demonstrate intervention effectiveness and experimental control. Implications for research and practice are discussed

    A collation of the lectionary of the four Gospels, 3/4 180 (Gregory), with the Textus receptus as edited by Lloyd and Sanday, 1889

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    Dissertation (Ph.D.)--Boston University, 1947. This item was digitized by the Internet Archive

    Development of an intelligent hypertext manual for the space shuttle hazardous gas detection system

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    A computer-based Integrated Knowledge System (IKS), the Intelligent Hypertext Manual (IHM), is being developed for the Space Shuttle Hazardous Gas Detection System (HGDS) at the Huntsville Operations Support Center (HOSC). The IHM stores all HGDS related knowledge and presents them in an interactive and intuitive manner. The IHM's purpose is to provide HGDS personnel with the capabilities of: enhancing the interpretation of real time data; recognizing and identifying possible faults in the Space Shuttle sub-system related to hazardous gas detections; locating applicable documentation related to procedures, constraints, and previous fault histories; and assisting in the training of personnel
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