Dictionary of Purple Sulpher Bacteria, Dictionary of Pyrimidine, Pycnidium, Pycniospore, Pycnosis, Pyramid of Biomass, Pyramid of Energy

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Home >>Botany Dictionary >> Purple Sulpher Bacteria - Pyrimidine

	Purple Sulpher Bacteria - Said of photosynthetic bacteria Chromatiaceae or Thiorhizodaceae. Pycnidium - The fertile layer of an Ascomycete when it lies in a cup or flask-shaped cavity that is open from the beginning. Pycniospore - Of Uredinales, a spore from a pycnium, a spermatium. Sometimes used for a pycnidiospore. Pycnidium - The fertile layer of an Ascomycete when it lies in a cup or flask-shaped cavity that is open from the beginning.
Pycnosis - (1) Contraction of the nucleus when the cell dies. It forms a compact, strongly-staining mass. (2) The formation of a perithecium under the cover of the tissue of a stroma. Pycnospore - A spore formed inside a pycnidium. Pyramid of Biomass - Used for describing a pyramid shaped diagram in which each horizontal bar is denoting the total biomass present at a time in a trophic level of the ecosystem that is being studied. Lowsermost bar is denoting producers and above it are bars denoting herbiyores and carnivores successively. Such a diagram may be having the shape of inverted pyramid also in certain types of ecosystems.
Pyramid of Energy - Used for describing the pyramid shaped diagram in which horizontal bars are representing total amount of energy passed on form one lower to next higher trophic level in unit time in the ecosystem being studied while the lowermost bar is representing the energy passed on from abiotic component to producers and topmost bar is representing the energy passed on from next lower carnivore level to the top carnivore level. Pycnidium - The fertile layer of an Ascomycete when it lies in a cup or flask-shaped cavity that is open from the beginning. Pycniospore - Of Uredinales, a spore from a pycnium, a spermatium. Sometimes used for a pycnidiospore.
Pyramid of Numbers - Used for describing the pyramid shaped diagram in which each horizontal bar is representing the total number of organisms in one trophic level in the ecosystem being studied, lowermost bar for producers and uppermost for top carnivores. The shape of diagram may undergo partial inversion in case of a forest ecosystem. Pyranose Ring - A 6-membered ring having 5-carbon atoms and one oxygen atom and is formed by any aldose sugar with 5 or more carbon atoms. Pyrene - A small hard body having a single seed, rather like the stone of drupe, but many pyrenes may be found in a single fruit. Pyrimidine - Said of a nitrogen containing organic base which is composed of a single heterocyclic ring. Two pyrimidines cytosine and thymine, are constituents of DNA while uracil and cytosine are constituents of RNA.
	Pycniospore - Of Uredinales, a spore from a pycnium, a spermatium. Sometimes used for a pycnidiospore. Pyrenium - An obsolete term for the sporocarp of the Sphaeriales. Pyrenocarpeae - A series of the Ascolichenes in which the fruit body is a perithecium. Pyrenoid - A small round protein granule storing starch around, it as a sheath. They are found singly or in numbers embedded in the chloroplasts of various algae and bryopthytes. Pyridine Alkaloids - Used for a group of alkaloids whose structure is based on pyridine nucleus (a 6-membered ring of five carbon and one nitrogen atom and three double bonds. Examples are hemlock alkaloids e.g., conine present in hemlock. Conium maculatum).

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