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Caenorhabditis elegans (/ ˌ s iː n oʊ r æ b ˈ d aɪ t ə s ˈ ɛ l ə ɡ æ n s / [6]) is a free-living transparent nematode about 1 mm in length [7] that lives in temperate soil environments. It is the type species of its genus. [8] The name is a blend of the Greek caeno-(recent), rhabditis (rod-like) [9] and Latin elegans (elegant).
Bismuth ( 83 Bi) has 41 known isotopes, ranging from 184 Bi to 224 Bi. Bismuth has no stable isotopes, but does have one very long-lived isotope; thus, the standard atomic weight can be given as 208.980 40(1). Although bismuth-209 is now known to be radioactive, it has classically been considered to be a stable isotope because it has a half ...
An operant conditioning chamber (also known as a Skinner box) is a laboratory apparatus used to study animal behavior. The operant conditioning chamber was created by B. F. Skinner while he was a graduate student at Harvard University. The chamber can be used to study both operant conditioning and classical conditioning.
Noninvasive prenatal testing ( NIPT) is a method used to determine the risk for the fetus being born with certain chromosomal abnormalities, such as trisomy 21, trisomy 18 and trisomy 13. [1] [2] [3] This testing analyzes small DNA fragments that circulate in the blood of a pregnant woman. [4] Unlike most DNA found in the nucleus of a cell ...
Helen Lorraine (Cook) Erickson (born 1936) is the primary author of the modeling and role-modeling theory of nursing. [1] Her work, co-authored with Evelyn Tomlin and Mary Ann Swain, was published in the 1980s and derived from her experience in clinical practice. In 2006 she edited a book that provides additional information describing the ...
August 1, 2024 at 3:47 PM. DoorDash said Thursday that it set records for orders and revenue in the second quarter, growth that came despite slowing U.S. restaurant traffic. The San Francisco ...
Area code 207 is the sole telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Maine. Area code 207 was created as one of the original North American area codes in 1947. The numbering plan area retains its original boundaries, having never been split or overlaid. As of April 2020, area code 207 is not threatened ...
Invertebrate zoology. Invertebrate zoology is the subdiscipline of zoology that consists of the study of invertebrates, animals without a backbone (a structure which is found only in fish, amphibians, reptiles, birds and mammals ). Invertebrates are a vast and very diverse group of animals that includes sponges, echinoderms, tunicates, numerous ...