| high energy particle generating unit | A machine capable of providing highly energised radiation for the purposes of radiotherapy treatment. (16 Dec 1997) |
|---|---|
| high energy phosphate bond | See: high energy phosphates. (05 Mar 2000) |
| high energy phosphates | Those phosphate's that, on hydrolysis, yield an unusually large amount of energy; e.g., nucleotide polyphosphates such as ATP, enol phosphate's such as phosphoenolpyruvate. See: high energy compounds. Synonym: energy-rich phosphates. (05 Mar 2000) |
| high extinction microscopy | <technique> Polarized-light, interference, fluorescence, and other modes of microscopy using polarization rectifiers and other devices to achieve a high degree of back- ground extinction in order to bring out the signal originating from a very small degree of birefringence, optical path difference, fluorescence etc. (05 Aug 1998) |
| high forceps delivery | Delivery by forceps applied to the foetal head before engagement has taken place. (05 Mar 2000) |
| high frequency current | An alternating electric current having a frequency of 10,000 or more per second; it produces no muscular contractions and does not affect the sensory nerves. Synonym: d'Arsonval current, Tesla current. (05 Mar 2000) |
| high frequency deafness | Selective loss of hearing acuity for high frequencies, usually associated with neurosensory damage; common in acoustic trauma. (05 Mar 2000) |
| high frequency recombination strain | A type of bacterial strain which is able to pass on genetic information to neighboring bacteria at a high rate. The high-frequency recombination strain (Hfr) is able to do this because it possesses the f plasmid and can therefore initiate bacterial conjugation. (09 Oct 1997) |
| high frequency transduction | Specialised transduction in which the donor bacterium contains not only the transducing, defective probacteriophage but also nondefective prophage that serves as "helper" virus, enabling most of the defective prophage particles to develop sufficiently to function as transducing agents. (05 Mar 2000) |
| high lip line | The greatest height to which the lip is raised in normal function or during the act of smiling broadly. (05 Mar 2000) |
| high lithotomy | Lithotomy in which the bladder is entered by an incision immediately above the symphysis pubis. Synonym: high lithotomy. (05 Mar 2000) |
| high mannose oligosaccharide | <biochemistry> A subset of the N glycan chains that are added post translationally to certain asparagine residues of secreted or membrane proteins in eukaryotic cells, contain 5-9 mannose residues, but lack the sialic acid terminated antennae of the so called complex type. (18 Nov 1997) |
| high mobility group proteins | Family of small, nonhistone, nuclear proteins. Some appear to be involved in controlling transcription. (18 Nov 1997) |
| high osmolar contrast agent | Ionic water-soluble iodinated contrast media. Synonym: high osmolar contrast medium. (05 Mar 2000) |
| high osmolar contrast medium | Ionic water-soluble iodinated contrast media. Synonym: high osmolar contrast medium. (05 Mar 2000) |