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Mucor spores or sporangiospores can be simple or branched and form apical, globular sporangia that are supported and elevated by a column-shaped columella. Mucor species can be differentiated from molds of the genera Absidia , Rhizomucor , and Rhizopus by the shape and insertion of the columella, and the lack of stolons and rhizoids .
Cancer slope factors (CSF) are used to estimate the risk of cancer associated with exposure to a carcinogenic or potentially carcinogenic substance. A slope factor is an upper bound, approximating a 95% confidence limit , on the increased cancer risk from a lifetime exposure to an agent by ingestion or inhalation .
A columella (pl. columellae) is a sterile (non-reproductive) structure that extends into and supports the sporangium of some species. In fungi, the columella, which may be branched or unbranched, may be of fungal or host origin. Secotium species have a simple, unbranched columella, while in Gymnoglossum species, the
The Myxogastria or plasmodial slime molds are the only macroscopic scale slime molds; they gave the group its informal name, since for part of their life cycle they are slimy to the touch. [16] A myxogastrian consists of a large cell with thousands of nuclei within a single membrane without walls, forming a syncytium. [17]
Backusella; Sporangium (i.e. a cluster of sporangiospores surrounding a columella (obscured in image by sporangiospores) subtended by a hypha) viewed with bright-field light microscope
The term columella is also used to refer to story 1 to story 4 (S1 – S4) cells in the root cap, located apically of the quiescent centre. [citation needed] In vascular plants, columella tissue helps the roots to perceive gravity. Within columella cells, the amyloplasts and Golgi apparatus organelles tend to fall to the bottom third of the ...
The sporangium has an operculum, epiphragm, columella, sporangial jacket, a spore bearing layer, and nematodontous teeth. Nematodontous teeth are composed of whole, thickened dead cells. [ 10 ] Although nematodontous teeth are not hygroscopic , [ 11 ] they may aid in spore dispersal through small movements (they do not move much). [ 9 ]
Rhizopus is a genus of common saprophytic fungi on plants and specialized parasites on animals. They are found in a wide variety of organic substances, including "mature fruits and vegetables", [2] jellies, syrups, leather, bread, peanuts, and tobacco.