| / English Dictionary |
COVALENT BOND
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
A chemical bond that involves sharing a pair of electrons between atoms in a molecule
Classified under:
Nouns denoting natural phenomena
Hypernyms ("covalent bond" is a kind of...):
bond; chemical bond (an electrical force linking atoms)
Hyponyms (each of the following is a kind of "covalent bond"):
double bond (a covalent bond in which two pairs of electrons are shared between two atoms)
coordinate bond; dative bond (a covalent bond in which both electrons are provided by one of the atoms)
Context examples:
A carbohydrate comprised of three to ten monosaccharides joined by ether bridges (covalent bonds centered by an oxygen).
(Oligosaccharide, NCI Thesaurus/CRCH)
A carbohydrate comprised of eleven or more monosaccharides joined by ether bridges (covalent bonds centered by an oxygen).
(Dietary Polysaccharide, NCI Thesaurus/CRCH)
A carbohydrate comprised of two monosaccharides joined by an ether bridge (covalent bonds centered by an oxygen).
(Disaccharide, NCI Thesaurus/CRCH)
A substance that dissociates to give hydroxide ions in aqueous solutions; a substance capable of donating a pair of electrons (to an acid) for the formation of a coordinate covalent bond; a substance whose molecule or ion can combine with a proton (hydrogen ion); a substance that combines with acids to form salts.
(Base, NCI Thesaurus)
Ligase Genes encode Ligases, a large major class of enzymes that catalyze the formation of a linking covalent bond between two substrate molecules, coupled with the hydrolysis of a pyrophosphate bond in ATP or a similar energy donor.
(Ligase Gene, NCI Thesaurus)
A substance that yields hydrogen ions or protons in aqueous solutions; a substance capable of accepting a pair of electrons for the formation of a coordinate covalent bond; a substance whose hydrogen can be replaced by metals or basic radicals, or which react with bases to form salts and water.
(Acid, NCI Thesaurus)
Affecting biological factors or systems, a Biophysical Process is a subatomic, atomic, or molecular process that involves passive, physical movement; attraction or repulsion (electrostatic, van der Waals, gradient, hydrogen bonding, hydrophobic, hydrophilic, etc.); radiation interaction; or non-enzymatic formation of covalent bonds.
(Biophysical Process, NCI Thesaurus)
Pantoprazole is a lipophilic, weak base that crosses the parietal cell membrane and enters the acidic parietal cell canaliculus where it becomes protonated, producing the active metabolite sulfenamide, which forms an irreversible covalent bond with two sites of the H+/K+-ATPase enzyme located on the gastric parietal cell, thereby inhibiting both basal and stimulated gastric acid production.
(Pantoprazole Sodium, NCI Thesaurus)
Although the exact mechanism of action remains to be elucidated, budotitane potentially binds either to macromolecules via coordinative covalent bonds, or via intercalation between nucleic acids strands by the aromatic ring of the beta-diketonate.
(Budotitane, NCI Thesaurus)
Pantoprazole is a lipophilic weak base that crosses the parietal cell membrane and enters the acidic parietal cell canaliculus where it becomes protonated, producing the active metabolite sulphenamide, which forms an irreversible covalent bond with two sites of the H+/K+-ATPase enzyme located on the gastric parietal cell, thereby inhibiting both basal and stimulated gastric acid production.
(Pantoprazole, NCI Thesaurus)
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