essential+element
61Period 2 element — A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the… …
62oxygen group element — ▪ chemical element Introduction also called chalcogen, any of the five chemical elements making up Group 16 (VIa) of the periodic classification namely, oxygen, sulfur, selenium, tellurium, and polonium. (See Figure >.) A relationship among… …
63command element — The core element of a Marine air ground task force (MAGTF) that is the headquarters. The command element is composed of the commander, general or executive and special staff sections, headquarters section, and requisite communications support,… …
64Group 11 element — Group → 11 ↓ Period 4 29 Cu 5 …
65List of chemical element name etymologies — This is the list of etymologies for all chemical element names: Name Symbol Language of origin Word of origin Meaning Symbol origin Description Actinium Ac Greek ἀκτίς (aktis) beam Greek aktinos ἀκτίς, ἀκτῖνος (aktis; aktinos), meaning beam (ray) …
66Group 9 element — Group → 4 ↓ Period 4 27 Co 5 …
67Retroviral Psi packaging element — is a cis acting RNA element identified in the genomes of the retroviruses Human immunodeficiency virus (HIV) and Simian immunodeficiency virus (SIV). It is involved in regulating encapsidation of the retroviral RNA, an essential step in… …
68Bamboo mosaic virus satellite RNA cis-regulatory element — The bamboo mosaic virus satellite RNA cis regulatory element is an RNA element found in the 5 UTR of the genome of the bamboo mosaic virus. This element is thought to be essential for efficient RNA replication. [cite journal | last = Annamalai |… …
69Hepatitis E virus cis-reactive element — The Hepatitis E virus cis reactive element is a RNA element that is thought to be essential for some step in gene expression . [cite journal | last = Graff | first = J | coauthors = Nguyen H, Yu C, Elkins WR, St Claire M, Purcell RH, Emerson SU | …
70Potato virus X cis-acting regulatory element — The Potato virus X cis acting regulatory element is a cis acting regulatory element found in the 3 UTR of the Potato virus X genome. This element has been found to be required for minus strand RNA accumulation and is essential for efficient viral …
