or editors. in the space of a few weeks, we have all learned a lot about covid- and the virus that causes it: sars-cov- . but there have also been a lot of rumours. and while the number of scientific articles on this virus is increasing, there are still many grey areas as to its origins. in which animal...
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for the assessment of acute effects than for chronic effects. view full glossary lr lethal rate (lr ) is an indication of the lethal toxicity of a given substance, representing a rate at which % of subjects die. view full glossary pesticides "any substance or mixture of substances used to alter the...
for steam or other vapour power units: - auxiliary plant for use with boilers of heading or air pollution control auxiliary plant for use with boilers of heading or (for example, economisers, super- heaters, soot removers, gas recoverers); condensers for steam or other vapour power units: - condensers...
erased persian persian rugs each city in iran has a unique handicraft, which makes for a memorable souvenir, but getting the ideal persian rug is an ultimate definitive prize. persian rugs are sure to mesmerize you with various prints and patterns they have. the specialty of rug weaving in iran began...
as an atomized spray or regenerated smoke. smoking chambers are designed for batch or continuous processes. oil or water-based liquid smoke can be added directly to the products as a flavouring in lieu of the smoking process. oil-based liquid smokes are used when the product is sensitive to the low...
messenger. find out what's happening in the world as it unfolds. just watched "it's not the cow, it's the how." replay more videos ... must watch "it's not the cow, it's the how." : (cnn)the average american eats nearly pounds of beef ( kg) a year -- roughly equal to a couple of hundred burgers. but for...