Ecotoxicology and Climate Edited by P. Bourdeau‚ J. A. Haines‚ W. Klein and C. R. Krishna Murti @ 1989 SCOPE. Published by John Wiley & Sons Ltd 5.7 Fate and Undesirable Effects of Pesticides in Egypt A. H. EL-SEBAE 5.7.1 INTRODUCTION An overview of the status of the pesticides used in Egypt is presented in a case study. The fate‚ distribution‚ and adverse effects of the widely used pesticides are discussed. Chlorinated hydrocarbon insecticides and structurally related derivatives
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INTRODUCTION Vapour absorption refrigeration system is one of the oldest methods of producing refrigerating effect. John Leslie in 1810 kept H2SO4 and water in two separate jars connected together. H2SO4 has very high affinity for water. It absorbs water vapour and this becomes the principle of removing the evaporated water vapour requiring no compressor or pump. H2SO4 is an absorbent in this system that has to be recycled by heating to get rid of the absorbed water vapour‚ for continuous
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The Open Mineral Processing Journal‚ 2011‚ 4‚ 25-44 25 Open Access Flotation Frothers: Review of Their Classifications‚ Properties and Preparation Hamid Khoshdast* and Abbas Sam Department of Mining Engineering‚ Faculty of Engineering‚ Shahid Bahonar University‚ 76169133‚ Kerman‚ Iran Abstract: The importance of frothers in flotation is widely acknowledged‚ particularly in terms of their role with respect to bubble size‚ and the stability and mobility of the froth phase. These factors
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Ultrasound Physical effects of ultrasound: 1- Thermal effects 2- Non-thermal effects 3- Effect of US in tissue repair First: thermal effect @ It is due to generation of heat within the tissue due to adsorption of US. @ Tissue with high amount of protein absorbs US more than other tissues. @ Generation of heat within the tissue will decrease pain‚ joint stiffness & increase blood flow. @ Thermal effect achieved if the temperature of the tissue is raised to 40°c - 45°c for at least
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CHAPTER 1 – GENERAL INTRODUCTION 1.1 Origin of Radon and Exposure Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive‚ colorless‚ odorless‚ tasteless noble gas‚ occurring naturally as the decay product of uranium. Radon is a gas produced by the radioactive decay of the element radium. Radioactive decay is a natural‚ spontaneous process in which an atom of one element decays or breaks down to form another element by losing atomic particles (protons‚ neutrons‚
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LEDs… Release only ONE color of light Produce very little heat What is an LED? They are semiconductor devices that can convert electrical energy directly into light due to the nature of the bonding that occurs in the semiconductor solid. Type of bonding is directly related to conductivity of solid. Bonding in Elemental Solids Electronegativity – the ability of an atom to attract electrons to itself. Atoms with low e.n. (metals) don’t hold valence electrons tightly valence
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Introduction: There are metal substances which have mixed up with the river water of Bangladesh. The substance is known as Arsenic in Bangladesh. It was first found in the West Bengal ten years ago (1995-96). Arsenic is both toxic and carcinogenic. It is in inorganic forms‚ dissolved in drinking water which is the most significant forms of natural exposure. Organic forms of arsenic that may be present in food are much less toxic to humans. Clinical manifestations of arsenic poisoning begin with
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Polymeric Biomaterials (Mingyu Li z3369978) The use of polymers in biomedical applications is now widely accepted and they are termed with the generic name of polymeric biomaterials. A biomaterial can be defined by their function as a material in contact with living tissue that used to the treatment of disease or injury‚ and to improve human health by restoring the function of tissue and organs in the body.x Polymeric biomaterials in medicine include surgical sutures‚ drug delivery vectors‚ orthopedic
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mark the first large finds of natural gas (i.e. > 0.5 tcf)‚ prior to 1955‚ gas was utilized as fuel to power machines in the oilfields they were found associated with and was then known as casing head gas. During the 1930s three absorption and one adsorption plant for the recovery of gasoline from natural gas began operation in the country1. During this period as well (1933) the first small scale experimentation on natural gas for secondary oil recovery began‚ which blossomed into the first large scale
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FUNCTIONAL FOODS BY SHALU SINGH ABSTRACT Functional foods prevent many chronic diseases like Cardio- Vascular Diseases (CVD)‚ Cancer‚ Obesity‚ Alzheimer’s disease‚ etc. Dairy products‚ such as milk‚ cheese & yoghurt are among the best sources of several important vitamins like vitamin D & riboflavin and minerals specially calcium & phosphorus. Calcium‚ for example‚ prevents possible
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