| phytohaemagglutinin | <protein> Sometimes used as synonym for lectins in general, but more usually refers to lectin from seeds of the red kidney bean Phaseolus vulgaris. Binds to oligosaccharide containing N acetyl galactosyl residues. Binds to both B and T lymphocytes, but acts as a mitogen only for T-cells. (18 Nov 1997) |
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| phytohemagglutinin | A phytomitogen from plants that agglutinates red blood cells. The term is commonly used specifically for the lectin obtained from the red kidney bean (Phaseolus vulgaris) which is also a mitogen that stimulates T lymphocytes more vigorously than B lymphocytes. Synonym: phytolectin. (05 Mar 2000) |
| phytohemagglutinins | Mucoproteins isolated from the kidney bean (phaseolus vulgaris); some of them are mitogenic to lymphocytes, others agglutinate all or certain types of erythrocytes or lymphocytes. They are used mainly in the study of immune mechanisms and in cell culture. (12 Dec 1998) |
| phytohormone | <plant biology> Substances that, at low concentration, influence plant growth and differentiation. Formerly referred to as plant hormones or phytohormones, these terms are now suspect because some aspects of the hormone concept, notably action at a distance from the site of synthesis, do not necessarily apply in plants. Also called plant growth regulators. The major classes are absicisic acid, auxin, cytokinin, ethylene and gibberellin, others include steroid and phenol derivatives. (31 Dec 1997) |
| phytoid | Resembling a plant; plantlike. Origin: Phyto-. Source: Websters Dictionary (01 Mar 1998) |
| phytol | Long chain fatty alcohol (C20) forming part of chlorophyll, attached to the protoporphyrin ring by an ester linkage. (18 Nov 1997) |
| phytolacca | <botany> A genus of herbaceous plants, some of them having berries which abound in intensely red juice; poke, or pokeweed. Origin: NL, fr. Gr. Plant + It. Lacca lac. Source: Websters Dictionary (01 Mar 1998) |
| phytolectin | A phytomitogen from plants that agglutinates red blood cells. The term is commonly used specifically for the lectin obtained from the red kidney bean (Phaseolus vulgaris) which is also a mitogen that stimulates T lymphocytes more vigorously than B lymphocytes. Synonym: phytolectin. (05 Mar 2000) |
| phytolite | An old name for a fossil plant. Origin: Phyto-: cf. F. Phytolithe. Source: Websters Dictionary (01 Mar 1998) |
| phytolithologist | One versed in phytolithology; a paleobotanist. Source: Websters Dictionary (01 Mar 1998) |
| phytolithology | <study> The branch of science which treats of fossil plants; usually called paleobotany, sometimes paleophytology. Origin: Phyto- + lithology. Source: Websters Dictionary (01 Mar 1998) |
| phytological | Of or pertaining to phytology; botanical. Origin: Cf. F. Phytologique. Source: Websters Dictionary (01 Mar 1998) |
| phytologist | One skilled in phytology; a writer on plants; a botanist. Source: Websters Dictionary (01 Mar 1998) |
| phytology | <study> The science of plants; a description of the kinds and properties of plants; botany. Origin: Phyto-: cf. F. Phytologie. Source: Websters Dictionary (01 Mar 1998) |
| Phytomastigina | Former term for plant-like flagellates, originally classified as a suborder or order, raised to the class Phytomastigophorea (Phytomastigophorasida) in recent classifications. Origin: phyto-+ G. Mastix, whip (05 Mar 2000) |