2,501 research outputs found
The control of animal brucellosis in Malta
Little publicity has so far been given to the work done in Malta in recent years towards the control of animal brucellosis, especially brucellosis in goats. This article describes work carried out between September 1956, and April 1968 at the Brucellosis Laboratory, Government Farm, Ghammieri, and on farms in Malta and Gozo. It is based on a report about to be submitted to the Government of Malta by the Food and Agriculture Organisation of the United Nations. This organisation has done much to assist the work, especially in the last four years. During the course of this work the incidence of human brucellosis in Malta showed a marked and constant decline and it is considered that some of this decline must have resulted from the measures taken to control caprine brucellosis. The F.A.O. report contains a number of recommendations which it is hoped will help to bring the campaign for the eradication of brucellosis from Malta to a successful conclusion. The achievement of this objective would be a considerable event in Malta's history.peer-reviewe
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The use of data on soil and climate resources of Essex County, Massachusetts in agricultural instruction.
Supercritical Carbon Dioxide Extraction of Southern Pine and Ponderosa Pine
Pine wood and bark were extracted with supercritical (SC) carbon dioxide under various experimental conditions. The extractive yields ranged from 20-60% relative to the total diethyl ether extractive content. The yields were dependent on temperature, pressure, particle size, and fluid to wood ratio. The addition of ethanol to bark particles prior to SC CO2 extraction produced higher yields of extracts relative to extractions without the addition of ethanol. Gas chromatographic (GC) analysis of selected SC carbon dioxide extracts revealed that the concentration of resin acids, as well as the yield of pure abietic acid, increased with temperature at constant pressure. Fatty acids were more soluble in SC carbon dioxide relative to diethyl ether. The concentration of fatty acids in SC carbon dioxide extracts did not appear to follow definite trends. In addition, observation of the wood particles with scanning electron microscope (SEM) revealed that the supercritical extraction process did not appear to significantly alter the wood surface structure
Quark Number Susceptibility and Thermodynamics in HTL approximation
In HTL perturbation theory we obtain leading order quark number
susceptibility as a response to an external disturbance, viz., chemical
potential (\mu) that generates density fluctuation, which is related to the
correlation function through the thermodynamic sum rule associated with the
symmetry of the system. We also obtain various thermodynamic quantities in
leading order.Comment: 4 pages, 2 figures, Talk given at the 6th ICPAQGP-2010, Goa, India,
December 6-10, 201
Incidental Finding of Inferior Vena Cava Atresia Presenting with Deep Venous Thrombosis following Physical Exertion
Inferior vena cava atresia (IVCA) is a rare but well described vascular anomaly. It is a rare risk factor for deep venous thrombosis (DVT), found in approximately 5% of cases of unprovoked lower extremity (LE) DVT in patients <30 years of age. Affected population is in the early thirties, predominantly male, often with a history of major physical exertion and presents with extensive or bilateral DVTs. Patients with IVC anomalies usually develop compensatory circulation through the collateral veins with enlarged azygous/hemizygous veins. Despite the compensatory circulation, the venous drainage of the lower limbs is often insufficient leading to venous stasis and thrombosis. We describe a case of extensive and bilateral deep venous thrombosis following physical exertion in a thirty-six-year-old male patient with incidental finding of IVCA on imaging
Chemical Variation In Lodgepole Pine With Sapwood/Heartwood, Stem Height, and Variety
The chemical variation in lodgepole pine over its geographical range with sapwood/heartwood, stem height, and variety was investigated. In both varieties, latifolia and murrayana, the heartwood was significantly higher in extractives than the sapwood, whereas the sapwood was significantly higher in holocellulose and alpha-cellulose than the heartwood. The sapwood and heartwood did not differ in pH and lignin content.Ash, lignin, and holocellulose content were positively correlated with stem height in latifolia and murrayana. Extractive and alpha-cellulose content were negatively correlated with stem height. The stem height variations appeared to be related to the heartwood/sapwood ratio, proportion of mature and juvenile wood, and the specific gravity.The variation between latifolia and murrayana in ash, extractive, and lignin content and pH was small. In contrast, the holocellulose and alpha-cellulose content was 2% higher in murrayana than in latifolia. The polysaccharide variation may be influenced by climate and site conditions as well as genetic differences
Is Brucella Melitensis Rev. 1 Vaccine Dangerous
Δεν διατίθεται περίληψη.No abstract (available)
Plasma As A High-charge-state Projectile Stripping Medium
The classical trajectory Monte Carlo model has been used to computationally study the charge-state distributions that result from interactions between a high-energy, multielectron projectile and neutral and fully ionized targets. These studies are designed to determine the properties of a plasma for producing highly stripped ions as a possible alternative to gas and foil strippers that are commonly used to enhance the charge states of energetic ion beams. The results of these studies clearly show that a low-atomic-number, highly ionized plasma can yield higher charge states than a neutral target of the same density. The effect is principally attributable to the reduction in the number of available electron-capture channels. In this article, we compare the charge-state distributions that result during passage of a 20-MeV Pb projectile through neutral gas and fully ionized (singly charged) plasma strippers and estimate the effects of multiple scattering on the quality of the beam. © 1992 The American Physical Society
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The Sputter Generation of Negative Ion Beams
A brief review is given of recent progress toward a quantitative understanding of negative ion formation by sputtering from surfaces covered with fractional layers of highly electropositive adsorbates. Practical models developed for estimating changes in work functions {Delta}{phi} by electropositive adsorbates are described. The secondary negative ion generation process is examined through the use of composite energy/velocity dependent analytical models. These models are used to illustrate the effect of work function on the energy distributions of negative ions sputter ejected from a polycrystalline molybdenum surface covered with fractional layers of cesium. Predictions are also made of the functional dependence of the probability for negative ion formation on cesium coverage. The models predict energy distributions which are in basic disagreement with experimental observations, implying their inappropriateness for describing the sputter negative ion generation process. We have also developed a model for calculating sputter ratios based on the use of simple scaling procedures to bring Sigmund theory into close agreement with experimental observation accounting for the threshold effect. Scaling factors for projectile energies E > 1000 eV are found to be independent of energy while those for projectile energies E{sub th} < E < 1000 eV were found to be energy dependent. In this study, the model and scaling techniques utilized to bring Sigmund theory into agreement with experiment are discussed in detail and several examples provided which illustrate the versatility, accuracy and utility of the model. In the present report, we describe the model and apply it to the case of sputtering a selected number of metals with energetic cesium ions. In particular, we present sputter ratio information for a number of Cs-projectile/metal-target combinations; the targets are bombarded at normal incidence to the surface
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