| helix destabilising protein | <molecular biology, protein> Proteins involved in DNA replication. They bind cooperatively to single stranded areas of a DNA molecule in a double helix, causing the helix to unwind and preventing the reformation of the duplex and extending the DNA backbone, thus making the exposed bases more accessible for base pairing. (10 Oct 1997) |
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| helix loop helix | <molecular biology> A motif associated with transcription factors, allowing them to recognise and bind to specific DNA sequences. Two _ helices are separated by a loop. Examples: myoblast MyoD1, c myc, Drosophila genes daughterless, hairy, twist, scute, achaete, asense. Not the same as helix turn helix. (18 Nov 1997) |
| helix turn helix | <molecular biology> A motif associated with transcription factors, allowing them to bind to and recognise specific DNA sequences. Two amphipathic _ helices are separated by a short sequence with a _ sheet. One helix lies across the major groove of the DNA, while the recognition helix enters the major groove and interacts with specific bases. An example in Drosophila is the homeotic gene fushi tarazu, that binds to the sequence TCAATTAAATGA. Not the same as helix loop helix. (18 Nov 1997) |
| helix-coil transition | <molecular biology> A change in the structure of a nucleic acid or protein molecule from a highly ordered, complex structure to a random, chaotic structure. Also means that the protein or nucleic acid becomes denatured. (09 Oct 1997) |
| helix-loop-helix motifs | A group of 20-residue peptides characterised by two alpha helices separated by a non-helical segment. These recurring supersecondary structural patterns are found in many sequence-specific DNA-binding proteins. (12 Dec 1998) |
| helix-turn-helix motifs | The first DNA-binding protein motif to be recognised. Helix-turn-helix motifs were originally identified in bacterial proteins but have since been found in hundreds of DNA-binding proteins from both eukaryotes and prokaryotes. They are constructed from two alpha helices connected by a short extended chain of amino acids, which constitute the "turn." the two helices are held at a fixed angle, primarily through interactions between the two helices. (12 Dec 1998) |
| hell | 1. The place of the dead, or of souls after death; the grave; called in Hebrew sheol, and by the Greeks hades. "He descended into hell." (Book of Common Prayer) "Thou wilt not leave my soul in hell." (Ps. Xvi. 10) 2. The place or state of punishment for the wicked after death; the abode of evil spirits. Hence, any mental torment; anguish. "Within him hell." "It is a knell That summons thee to heaven or to hell." (Shak) 3. A place where outcast persons or things are gathered; as: A dungeon or prison; also, in certain running games, a place to which those who are caught are carried for detention. A gambling house. "A convenient little gambling hell for those who had grown reckless." . A place into which a tailor throws his shreds, or a printer his broken type. Gates of hell. See Gate. Origin: AS. Hell; akin to D. Hel, OHG. Hella, G. Holle, Icel. Hal, Sw. Helfvete, Dan. Helvede, Goth. Halja, and to AS. Helan to conceal. Cf. Hele, Conceal, Cell, Helmet, Hole, Occult. Source: Websters Dictionary (01 Mar 1998) |
| hell-diver | <zoology> The dabchick. Source: Websters Dictionary (01 Mar 1998) |
| hellbender | <zoology> A large North American aquatic salamander (Protonopsis horrida or Menopoma Alleghaniensis). It is very voracious and very tenacious of life. Also called alligator, and water dog. Source: Websters Dictionary (01 Mar 1998) |
| hellebore | A plant belonging to the genus Helleborus. It is a type of buttercup with leaves at the base of the plant and flowers in clusters. Some species contain the organic chemical helleborein, which is used as a heart stimulant. (09 Oct 1997) |
| helleborein | <protein> A poisonous chemical found in the roots and rhizomes (underground stem other than roots) of certain hellebore plants. It is a yellow crystalline solid with the chemical formula C37H56O18 and is used as a stimulant of the heart. (09 Oct 1997) |
| helleborin | <chemistry> A poisonous glucoside found in several species of hellebore, and extracted as a white crystalline substance with a sharp tingling taste. It possesses the essential virtues of the plant. Synonym: elleborin. Source: Websters Dictionary (01 Mar 1998) |
| helleborism | The practice or theory of using hellebore as a medicine. Source: Websters Dictionary (01 Mar 1998) |
| helleborus | Black hellebore, the dried rhizome and roots of Helleborus niger (family Ranunculaceae); used as a cardiac and arterial tonic, diuretic, and cathartic. Origin: G. Helleboros (05 Mar 2000) |
| Heller myotomy | Treatment of oesophageal achalasia by longitudinal division of the lowest part of the oesophageal muscle down to the submucosal layer; some muscle fibres of the cardia may also be divided. Synonym: cardiomyotomy, oesophagogastromyotomy, Heller myotomy. Origin: oesophagus + G. Mys, muscle, + tome, incision (05 Mar 2000) |
Synonyms : Helper Virus, Virus, Helper, Viruses, Helper
Synonyms : Behavior, Helping, Behaviors, Helping, Helping Behaviors
Synonyms :
Synonyms : Declaration, Helsinki, Helsinki Declarations
| helper T cell |
A type of white blood cell that helps stimulate immune system reactions. Helper T cells help activate cytotoxic T cells and macrophages by secreting cytokines. They also stimulate B cells to make antibodies.
출처: www.stjude.org/glossary
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| Helbing's sign |
medialward curving of the Achilles tendon as viewed from behind; seen in flatfoot.
출처: www.merckmedicus.com/pp/us/hcp/thcp_dorlands_conte...
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| Helicobacter pylori |
A type of bacteria that can cause stomach ulcers; infection with this organism also plays a role in stomach cancer.
출처: www.ehealthmd.com/library/stomachcancer/STC_glossa...
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| helicase |
A protein that unwinds the DNA double helix during replication.
출처: www.genpromag.com/Glossary~LETTER~H.html
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| helper cell |
A T-lymphocyte that binds antigens on the surface of presenting cells and secretes lymphokines that activate cytotoxic cells.
출처: www.genpromag.com/Glossary~LETTER~H.html
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| HEL | therapeutic exposure to sunlight |
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| HEL | a genus of Noctuidae |
| HEL | medium-sized moth whose larvae are corn earworms |
| HEL | medium-sized moth whose larvae are corn earworms |
| HEL | larva of a noctuid moth |
| HEL | green chalcedony with red spots that resemble blood |
| HEL | an orienting response to the sun |
| HEL | duplicator consisting of a gelatin plate from which ink can be taken to make a copy |
| HEL | mostly freshwater protozoa |
| HEL | protozoa with spherical bodies and stiff radiating pseudopods |
| HEL | an airport for helicopters |
| HEL | genus of South African and Australian herbs or shrubs grown as everlastings |