A study of stress-free living bone and its application to space flight

Observations of animals and human subjects in weightless space flight (Skylab and COSMOS) document altered bone metabolism. Bone metabolism is affected by a number of local and systemic factors. The calcification and growth of transplanted bone is independent of local muscle, nervous, and mechanical forces; therefore, transplanted bone would provide data on the role of local vs. systematic factors. Bone metabolism in living transplanted bone, devoid of stress, was investigated as a possible tool for the investigation of countermeasures against disuse bone loss. An animal model using Sprague-Dawley rats was developed for transplantation of femur bone tissue on a nutrient vascular pedicel. The long term course of these implants was assessed through the measure of regional and total bone mineral, blood flow, and methylene diphosphonate (MDP) uptake. Clomid, an estrogen agonist/antagonist, was shown to protect bone from disuse loss of minerals by retarding trabecular and cortical resorption

In vivo nuclear magnetic resonance imaging

During the past year the Woodlands Baylor Magnetic Resonance Imaging (MRI) facility became fully operational. A detailed description of this facility is given. One significant instrument addition this year was the 100 MHz, 40cm bore superconducting imaging spectrometer. This instrument gives researchers the capability to acquire high energy phosphate spectra. This will be used to investigate ATP, phosphocreatinine and inorganic phosphate changes in normal and atrophied muscle before, during and after exercise. An exercise device for use within the bore of the imaging magnet is under design/construction. The results of a study of T sub 1 and T sub 2 changes in atrophied muscle in animals and human subjects are given. The imaging and analysis of the lower leg of 15 research subjects before and after 5 weeks of complete bedrest was completed. A compilation of these results are attached

Real-time speech encoding based on Code-Excited Linear Prediction (CELP)

This paper reports on the work proceeding with regard to the development of a real-time voice codec for the terrestrial and satellite mobile radio environments. The codec is based on a complexity reduced version of code-excited linear prediction (CELP). The codebook search complexity was reduced to only 0.5 million floating point operations per second (MFLOPS) while maintaining excellent speech quality. Novel methods to quantize the residual and the long and short term model filters are presented

Short-term effect of soil disturbance by mechanical weeding on plant available nutrients in an organic vs conventional rotations experiment

The question whether soil disturbance from mechanical weeding in organic systems affects nutrient release from organic matter in compost-amended soil was examined in a long-term organic-versus-conventional rotational cropping system experiment over three years. The experimental design included continuous snap beans, and a fully phased snap beans/fall rye crop rotation sequence. Treatments were combinations of yearly applied fertiliser (synthetic fertiliser, 1× compost, 3× compost) and weed control (herbicide, mechanical weeding). The 1× compost rate was calculated to deliver the equivalent of 50 kg N ha-1: equal to the rate ofN in the synthetic fertiliser treatments. Ion exchange membranes were buried for 24 hours following mechanical weeding in bean plots. Adsorbed ions were then eluted and quantified. Available ammonium-nitrogen was not affected byweeding treatment, but nitrate-nitrogen was consistently less in mechanically weeded plots than in plots treated with herbicide. Principal component analysis of NH4-N, NO3-N, P, K, Ca and Mg availabilities showed distinct groupings of treatments according to fertility treatment rather than weeding treatment. The effect of cropping sequence on available nutrients was pronounced (P ≤ 0.001) only in plots amended with synthetic fertilisers

The Changing Food Assistance Landscape: The Food Stamp Program in a Post-Welfare Reform Environment

The Personal Responsibility and Work Opportunity Reconciliation Act of 1996 (PRWORA) dramatically transformed and continues to transform the food assistance landscape in the United States. The Act cut more funds from the Food Stamp Program than it did from any other program, through reductions in benefits per person and restrictions in eligibility. Despite these cuts, food stamps now have a more prominent role in the post-welfare reform social safety net because the largest cash-assistance entitlement program, Aid to Families with Dependent Children (AFDC), was replaced with the Temporary Assistance to Needy Families (TANF) program, a nonentitlement program. This leaves the Food Stamp Program as one of the only remaining entitlement programs available to almost all low-income households.food stamps, transfer payments, food consumption, nutrition, Food Consumption/Nutrition/Food Safety, Food Security and Poverty,

Girikihaciyan: A Halafian Site in Southeastern Turkey

This report presents the results of excavations undertaken at the site of Girikihaciyan in southeastern Turkey during 1968 and 1970 by the Joint Prehistoric Project, Istanbul-Chicago under the overal direction of Professor Halet Cambel, University of Istanbul, and Professor Robert J. Braidwood, Oriental Institute, University of Chicago.Series: Monographs 3

Highly separated transonic flows

Attention is given to the wind tunnel, to photographic visualization of the flow, and to measurements by pressure probes, hot wire anemometry and laser anemometry. The simultaneous use of different means of measurement provided a good description of the phenomenon, and indicated the existence of shocks and their stability, as well as the existence of the bubble, its dimensions, and in particular, the reattachment of its front. The results show that the bursting (or transition) of the bubble front is produced at an unstable position and creates a point of turbulent intensity which diffuses over the entire height of the flow

The Acadian Migrations

L'Acadie, depuis le début du XVIIe siècle jusqu'en 1713, faisait partie de l'empire colonial français en Amérique du Nord. Le traité d'Utrecht céda la plus grande partie de l'Acadie et sa population à la Grande-Bretagne. L'instabilité politique qu'engendra la position des Acadiens par rapport aux nouvelles limites coloniales aboutit finalement à leur expulsion et à leur déportation en 1755. Durant les cinquante années qui suivirent, se développa un vaste et difficile mouvement de retour. Mais ce n'est que vers la fin de cette période que les Acadiens se fixèrent définitivement en des endroits offrant un minimum de stabilité. Ces mouvements migratoires durant cette période font l'objet du présent article, de même que la répartition des communautés acadiennes vers 1800.Acadia from its initial settlement in 1604 until 1713 was a part of the French colonial empire in North America. By the Treaty of Utrecht most of Acadia and its French population was ceded to the British. The political instability generated by the anomalous position of the Acadians eventually led to their expulsion in 1755. During the following 50 years their efforts at repatriation were thwarted and only toward the end of the period were they finally settled in places offering a measure of security. The trends of their migrations over the period are illustrated, as well as their final settlement pattern in 1800