Search results
Results from the WOW.Com Content Network
DEET is effective against a variety of invertebrates, including ticks, flies, mosquitos, and some parasitic worms. [3]A 2018 systematic review found no consistent performance difference between DEET and icaridin in field studies and concluded that they are equally preferred mosquito repellents, noting that 50% DEET offers longer protection but is not available in some countries.
Insect repellent made with natural, plant-based active ingredients is less effective than conventional repellents Celery extract (Apium graveolens) (mosquitos) In clinical testing an extract of celery was demonstrated to be at least equally effective to 25% DEET, [53] although the commercial availability of such an extract is not known.
The species of worm has several genes in common with humans and researchers often use it as a way to model human reactions, she said. ... “DEET is a very effective way to do that, but we do also ...
The issue of toxicity was complicated, partly because DDT's effects varied from species to species, and partly because consecutive exposures could accumulate, causing damage comparable to large doses. A number of states attempted to regulate DDT. [9] [5] In the 1950s the federal government began tightening regulations governing its use. [24]
Esterifications of phosphoric acid with alcohols proceed less readily than the more common carboxylic acid esterifications, with the reactions rarely proceeding much further than the phosphate mono-ester. The reaction requires high temperatures, under which the phosphoric acid can dehydrate to form poly-phosphoric acids.
Batesian mimicry, where an edible species resembles a distasteful or dangerous species. This is most common in insects such as butterflies. A familiar example is the resemblance of harmless hoverflies (which have no sting) to bees. Müllerian mimicry, where two or more distasteful or dangerous animal species resemble each other.
Five cervid species (clockwise from top left): the red deer (Cervus elaphus), sika deer (Cervus nippon), barasingha (Rucervus duvaucelii), reindeer (Rangifer tarandus), white-tailed deer (Odocoileus virginianus) Cervidae is a family of hoofed ruminant mammals in the order Artiodactyla. A member of this family is called a deer or a cervid.
Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.