Dictionary,Defintion,Meaning,What is Plasmagene, Plastids, Placodont, Plankton, Planula, Plaque, Plasma cell, Plasma gel, Plasmagene, Plasmalemma, Plasma Membrane

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Your Ad Here	Placodont. A fossil reptile from the Triassic period. Plankton. Animals and plants of sea or lake which float to drift almost passively. They are mostly very small; the smallest are nannoplankton, e.g. diatoms. Plankton occurs mainly near the surface, where the plants get suitable illumination. Of great ecological and economic importance, providing food for fish and whales. Planula. The ciliated larva of coelenterates which lacks a body cavity.
Plaque. Clear zone in a bacterial culture on an agar plate caused by localized destruction of bacterial cells by activity of bacteriophage. Similarly applied to zone of lysis by virus in tissue culture of animal cells. Counting plaques provides simple technique for estimating concentration of infective virus in a fluid applied to the culture. Plasma. Blood plasma. Applied also to lymph minus its cells. Plasma cell. Vertebrate cell, with basophilic cytoplasm due to extensive endoplasmic reticulum; descendant of B-Lymphocyte secretes antibody. Plasma gel. An area of cytoplasm with a gel structure.
Plasmagene. Particle in cytoplasm having the properties of a gene in that it is self-reproducing, shows inheritance from cell to daughter cell, and affects the character of the cell bearing it; but unlike a gene in that it is not inherited in mendelian fashion through the gametes. Plasmalemma. Plasma-membrane (external plasma membrane in plants) Plasma Membrane. (Cell Membrane). Extremely thin membrane (about one hundredth micrometer thick) mainly of fat and protein covering the surface of all cells (or protoplast in plants). Responsible for restricted penetration of many substances into interior of cell and in the reverse direction. Severe damage to membranes at once destroys cell. In plants plasma membranes occur both at outer surface of protoplast external, ectoplast plasmalemma surrounded by cell wall, and bordering vacuole (internal, tonoplast)	Your Ad Here
Plasma Proteins. Dissolved proteins of vertebrate blood plasma (nearly seven per cent by weight of human blood) which are responsible for holding fluid in blood vessels by osmosis (See Capillary). To them is due the value of transfusion of plasma in increasing the volume of circulating blood. Amongst plasma proteins are antibodies and blood clotting substances. Plasmodium. (1) Vegetative stage of slime-fungi (Myxomycophyta.) Multinucleate, amoeboid mass of protoplasm bounded by plasma membrane, without a definite size or shape. Syncytium. (2) Generic name of malaria parasite, a sporozoan. Plasmolysis. Shrinkage of cell protoplasm away from its cellulose wall when placed in hypertonic solutions, due to osmotic withdrawal of wter from its large central vacuole.
Your Ad Here	Plasmon. A total complement of extra-chromosomal hereditary factors in a cell. Plastachron. Time interval between two of a series of periodic events, e.g. development of leaf promordia, in plant growth. Plastids. Small, variously shaped bodies in cytoplasm of plant cells (excluding bacteria, blue-green algae, fungi, slime-fungi), one to many per cell in different plants, containing DNA; pigments and/ or reverse food materials develop from pro-plastids. Some contain pigment chlorophyll, carotenoids, some are centres of accumulation of starch, proteins, oils. Comprise colourless leucoplasts and pigmented chromoplasts including chloroplasts.

Plastogene. Plastid carrying a factor having properties of gene but, unlike a gene, not inherited in mendelian fashion. A Plasmagene.

Plecoptera. The insect order containing the stoneflies which are hemimetabolous and similar to mayflies.

Pleiotropic. (Of a gene), affecting more than one characteristic in the phenotype.

Pleistocene. Geological epoch; lasted approximately from one and a half million till ten thousand years ago. During it four major ice ages occurred. Succeeded by Recent epoch.

Plerome. The central core of tissue in the stem or root apex of vascular plants. It gives rise to the vascular cylinder and pith.

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Biology Dictionary - Part 3 Part 4 Primates - Proembryo Prostaglandins - Proteolytic Enzyme Protostele - Pterodactyla (Pterosauria) Purkinje Cells - Pyrenoid Quadrate - Quantasomes Radula - Receptor (Sense-Organ) Rennin - Respiratory Movement Respiratory Pigment - Rhodophyta