Encyclopedia of Biology

...

ecdysone A juvenile steroid hormone that affects arthropods and that belongs to the larger class of ecdy- steroids, sterol deriv ...

primary-producer biomass consumed is converted into new consumer biomass. Ecological efficiency depends on assimilation effi- ci ...

Ehrlich was educated at the Breslau Gymnasium and then at the Universities of Breslau, Strassburg, Freiburg-im-Breisgau, and Lei ...

Eijkman’s syndrome, a complex of nervous symptoms in animals deprived of vitamin B 1 , is named for him. Einthoven, Willem (1860 ...

electron microscope(EM) A very large tubular microscope that focuses a highly energetic electron beam instead of light through a ...

electron-transport chain A chain of electron accep- tors embedded in the inner membrane of the mitochon- drion. These acceptors ...

endangered species 111 The Karner Blue— New York’s Endangered Butterfly by Robert Dirig The Karner blue (Lycaeides melissa samue ...

Endangered Species Act of 1973 (amended) Fed- eral legislation in the United States intended to provide a means whereby the ecos ...

Concord, New Hampshire. In 1915 he went to Yale University, left to become an air force pilot in 1918, and returned to get his B ...

reticulum and the Golgi apparatus, that are inside a eukaryotic cell; divides the cytoplasm into compart- mentswith various func ...

endothelium-derived relaxing factor (EDRF) The factor originally described as EDRF is NO., produced by aspecific P-450-type of E ...

containing or requiring one or more metal ions. In gen- eral, an enzyme catalyzes only one reaction type (reac- tion specificity ...

of a fertilized egg or spore through each stage of change, guided by genetics and environment until the final adult stage is com ...

lines body cavities, such as the gastrointestinal tract and the lining of the lung. Epidermal growth factor (EGF) is a hormone t ...

in many other animals. It can be pathogenic and is implicated in a number of food-borne illnesses, with an estimated 10,000 to 2 ...

sponges; animals with cells that form tissues and organs, a mouth, and digestive tract. Two branches exist, the radiata and the ...

excretion The process of separating and removing waste products of metabolism from the body through the discharge of urine, fece ...

extirpated species Aspecies no longer surviving in regions that were once part of its range. extracellular matrix(ECM) Material ...

F-430 A tetrapyrrole structure containing nickel, a component of the ENZYMEmethyl-coenzyme M reduc- tase, which is involved in t ...