Protein and energy nutrition of marine gadoids, Atlantic cod (Gadus morhua L.) and haddock (Melanogrammus aeglefinus L.)

Primary goals of this thesis were to: 1) examine the in vivo digestion of macronutrients from conventional or alternative feed ingredients used in practical diets of juvenile gadoids (Atlantic cod and haddock), 2) document growth potential of fish at the juvenile grower phase given varying levels of dietary protein and energy and 3) assess the potential of in vitro pH-Stat methods for rapid screening protein quality of feed ingredients, specifically for gadoids. All primary research questions were linked to and built upon one another with the goal of gaining a better understanding of protein and energy utilization of juvenile grower phase gadoids. Studies showed that cod and haddock have a high capacity to utilize a wide range of dietary feed ingredients, such as fish meals, zooplankton meal, soybean products (meal, concentrate and isolate) and wheat gluten meal. New dietary formulations for gadoids may also utilize pulse meals, corn gluten meal, canola protein concentrate and crab meal. Digestibility data in this thesis is currently the only research that examined both in vivo and in vitro macronutrient digestibility of a large number and wide range of individual ingredients, specifically for gadoids. This is essential to gain new knowledge on protein and energy utilization as well as for least-cost ration formulations and effective substitution of ingredients into new formulations. Data has demonstrated a dietary digestible protein/digestible energy (DP/DE)ratio of 30 g DP/MJ DE is required for gadoids during the juvenile phase (in vitro closed-system pH-Stat assay for rapid screening protein quality of test ingredients that is ‘species-specific’ to gadoids. It is demonstrated that in vitro results generally reflected results obtained through conventional in vivo protein digestibility methods. Studies resulted in the first generation of a ‘gadoid-specific’ proteolytic enzyme extraction method and in vitro closed-system pH-Stat assay which may be useful to investigate protein digestion, absorption and metabolism of gadoids and further development of their feeds. </p

Women who Select Naturopathic Health Care During the Menopausal Transition: A Study in Grounded Theory

A grounded theory method was used to investigate the experiences of women who use naturopathic medicine, a system of alternative therapy, for health care during the menopausal transition. Transcripts of 16 in-depth interviews with women who received naturopathic health care during the menopausal transition were analyzed with respect to three research questions: (a) Why do women seek naturopathic health care during the menopausal transition? (b) Do women who use naturopathic treatment for menopausal health care share similar experiences of menopause? and ( c) Are women satisfied with the naturopathic treatment they receive for menopausal health care? Conditions leading to informants\u27 use of naturopathy were represented by two categories: Practicing natural self-care, and Rejecting the conventional medical system Experiences of menopause were represented by three categories: It\u27s not a singular event, Paying attention to changes in and around me, and Information helps. Informants\u27 satisfaction with naturopathy for menopause-related health care was represented by four categories: Naturopathy is consistent with engaging in natural self-care practices, Naturopathy is effective in treating troubling menopausal signs, Naturopathy addresses individual and interrelated aspects of menopause, and Naturopathy provides moral and informational support. Continued analysis of the data revealed a core category, Exchanging infonnation, that provided a foundation for the theoretical model representing the experience of women who use naturopathic health care at menopause. The grounded theory developed in this study may be useful to health professionals by increasing understanding of the naturopathic health care option for menopausal women. Suggestions for further study include quantitative evaluation of components of the theory developed in this study, continued qualitative and quantitative investigation of aspects of information exchange between patients and their conventional and alternative practitioners, application of grounded theory methodology to studies of women\u27s use of hormone replacement therapy, and application of grounded theory methodology to studies of patients\u27 selection of alternative medicine for health matters other than menopause

Correspondence from S. Tibbetts to General Hodsdon

Correspondence from S. Tibbetts regarding absent soldiers from York Count

Women who Select Naturopathic Health Care During the Menopausal Transition: A Study in Grounded Theory

A grounded theory method was used to investigate the experiences of women who use naturopathic medicine, a system of alternative therapy, for health care during the menopausal transition. Transcripts of 16 in-depth interviews with women who received naturopathic health care during the menopausal transition were analyzed with respect to three research questions: (a) Why do women seek naturopathic health care during the menopausal transition? (b) Do women who use naturopathic treatment for menopausal health care share similar experiences of menopause? and ( c) Are women satisfied with the naturopathic treatment they receive for menopausal health care? Conditions leading to informants\u27 use of naturopathy were represented by two categories: Practicing natural self-care, and Rejecting the conventional medical system Experiences of menopause were represented by three categories: It\u27s not a singular event, Paying attention to changes in and around me, and Information helps. Informants\u27 satisfaction with naturopathy for menopause-related health care was represented by four categories: Naturopathy is consistent with engaging in natural self-care practices, Naturopathy is effective in treating troubling menopausal signs, Naturopathy addresses individual and interrelated aspects of menopause, and Naturopathy provides moral and informational support. Continued analysis of the data revealed a core category, Exchanging infonnation, that provided a foundation for the theoretical model representing the experience of women who use naturopathic health care at menopause. The grounded theory developed in this study may be useful to health professionals by increasing understanding of the naturopathic health care option for menopausal women. Suggestions for further study include quantitative evaluation of components of the theory developed in this study, continued qualitative and quantitative investigation of aspects of information exchange between patients and their conventional and alternative practitioners, application of grounded theory methodology to studies of women\u27s use of hormone replacement therapy, and application of grounded theory methodology to studies of patients\u27 selection of alternative medicine for health matters other than menopause

Correspondence from S. Tibbetts to General Hodsdon

Correspondence from S. Tibbetts regarding absent soldiers from York Count

Correspondence from S. Tibbetts to General Hodsdon

Correspondence from S. Tibbetts regarding absent soldiers from York Count

Chandra Observation of 3C 212: a New Look at the X-ray and UV Absorbers

The red quasar 3C 212 (z=1.049) is one of the most distant and most luminous AGN which has shown evidence of an X-ray warm absorber. In order to further investigate this unusual quasar, we used Chandra/ACIS-S to observe 3C 212 for 19.5 ksec, resulting in a net detection of ~4000 counts. The Chandra data confirm the presence of an excess absorbing column N_H ~ 4 x 10^21 cm^-2 at the quasar redshift, but we find no compelling evidence for a warm absorber. Using both the Chandra and archival ROSAT PSPC data, we obtain very good fits for both a partially covered neutral absorber and a low-ionization (U = 0.03) photo-ionized absorber. In the ultraviolet, 3C 212 shows a strong associated MgII absorber. Based on a moderate resolution (80 km/s) MMT spectrum we show that the absorber is highly saturated and has a covering fraction less than 60%, implying that the absorber is truly intrinsic to the quasar. Photo-ionization modeling of the MgII absorber yields a constraint on the ionization parameter of U < 0.03, inconsistent with a warm UV/X-ray absorber. In addition to our spectral analysis, we find evidence in the ACIS image data for weak extended emission surrounding the quasar as well as emission corresponding to the radio lobes at a distance of 5 arcsec from 3C 212. The statistical significance of these features is low, but we briefly explore the implications if the detections are valid.Comment: 8 pages, 6 figures, Accepted for publication in the Astrophysical Journa

Measurement of electron-hole friction in an n-doped GaAs/AlGaAs quantum well using optical transient grating spectroscopy

We use phase-resolved transient grating spectroscopy to measure the drift and diffusion of electron-hole density waves in a semiconductor quantum well. The unique aspects of this optical probe allow us to determine the frictional force between a two-dimensional Fermi liquid of electrons and a dilute gas of holes. Knowledge of electron-hole friction enables prediction of ambipolar dynamics in high-mobility electron systems.Comment: to appear in PR

On the Dynamical Ferromagnetic, Quantum Hall, and Relativistic Effects on the Carbon Nanotubes Nucleation and Growth Mechanism

The mechanism of carbon nanotube (CNT) nucleation and growth has been a mystery for over 15 years. Prior models have attempted the extension of older classical transport mechanisms. In July 2000, a more detailed and accurate nonclassical, relativistic mechanism was formulated considering the detailed dynamics of the electronics of spin and orbital rehybridization between the carbon and catalyst via novel mesoscopic phenomena and quantum dynamics. Ferromagnetic carbon was demonstrated. Here, quantum (Hall) effects and relativistic effects of intense many body spin-orbital interactions for novel orbital rehybridization dynamics (Little Effect) are proposed in this new dynamical magnetic mechanism. This dynamic ferromagnetic mechanism is proven by imposing dynamic and static magnetic fields during CNT syntheses and observing the different influence of these external magnetic environments on the catalyzing spin currents and spin waves and the resulting CNT formation

Linear Road : benchmarking stream-based data management systems

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.Includes bibliographical references (p. 57-61).This thesis describes the design, implementation, and execution of the Linear Road benchmark for stream-based data management systems. The motivation for benchmarking and the selection of the benchmark application are described. Test harness implementation is discussed, as are experiences using the benchmark to evaluate the Aurora engine. Effects of this work on the evolution of the Aurora engine are also discussed. Streams consist of continuous feeds of data from external data sources such as sensor networks or other monitoring systems. Stream data management systems execute continuous and historical queries over these streams, producing query results in real-time. This benchmark provides a means of comparing the functionality and performance of stream-based data management systems relative to each other and to relational systems. The benchmark presented is motivated by the increasing prevalence of "variable tolling" on highway systems throughout the world. Variable tolling uses dynamically determined factors such as congestion levels and accident proximity to calculate tolls. Linear Road specifies a variable tolling system for a fictional urban area, including such features as accident detection and alerts, traffic congestion measurements, toll calculations, and ad hoc requests for travel time predictions and account balances. This benchmark has already been adopted in the Aurora [ACC⁺03] and STREAM [MWA⁺03] streaming data management systems.by Richard S. Tibbetts, III.M.Eng