What's the difference between scutellum and thallus?
Scutellum
Definition:
(n.) A rounded apothecium having an elevated rim formed of the proper thallus, the fructification of certain lichens.
(n.) The third of the four pieces forming the upper part of a thoracic segment of an insect. It follows the scutum, and is followed by the small postscutellum; a scutella. See Thorax.
(n.) One of the transverse scales on the tarsi and toes of birds; a scutella.
Example Sentences:
(1) 3. beta-Sitosteryl linoleate is the major sterol ester of the scutellum and endosperm.
(2) The scutellum of maize is a fully differentiated, nondividing, diploid embryonic tissue.
(3) To our knowledge, this is the first observation of a gradient-type spatial pattern of a eukaryote gene activation occurring in a stable, virtually nondividing tissue such as the maize scutellum.
(4) The gene for isoenzyme I is expressed in the aleurone, scutellum and prominently in young leaves.
(5) A gene (Adhr(r)) which controls the activity of alcohol dehydrogenase in the scutellum of maize has been found.
(6) Immunofluorescent microscopy demonstrates that L3 protein accumulation is tissue-specific, confined to the embryo (scutellum and embryonic axis) and the aleurone layer of developing seed.
(7) In the scutellum of maize kernel after imbibition, lipase activity increased rapidly, concomitant with the decrease in storage triacylglycerols.
(8) In contrast, the gene for isoenzyme EI is transcribed at relatively high levels in young leaves, but also in the scutellum and aleurone of germinated grain.
(9) In situ RNA hybridization in isolated germinating embryo sections demonstrates that the PRms gene is expressed in the scutellum, particularly in a group of inner cells, and in the epithelium lying at the interface of the scutellum and the endosperm.
(10) The HRGP mRNA accumulates in the embryo axis and not in the scutellum and preferentially in dividing and provascular cells.
(11) This marker is R-scm3, which conditions anthocyanin pigment in the aleurone of the endosperm and the scutellum of the embryo.
(12) The scutellum and endosperm together contain 80% of the sterol ester of the seedling.
(13) Enzyme activity in Adh1-3F1124 sporophytic organs (scutellum and roots) is greatly reduced, while activity levels remain normal in the male gametophyte (pollen).
(14) Rates of catalase synthesis and degradation were measured in the scutellum of the germinating maize seedling by the technique of Price, Sterling, Tarantola, Hartley & Rechcigl [J. Biol.
(15) Drones with pollinia on their scutellum visit other orchids, which facilitates pollination.
(16) On germination, there is a transient re-appearance of mRNA to pZE40, with accumulation specifically restricted to the scutellum of the seedling.
(17) The composition of the sterol ester fraction of the shoot, root, scutellum and endosperm of 10-day-old maize seedlings was investigated.
(18) Northern-blot analyses with gene-specific probes indicate that the (1-->3)-beta-glucanase isoenzyme GIII mRNA accumulates in developing leaves; no mRNA transcripts were detected in the aleurone or scutellum of germinated grain, or in mature vegetative tissues.
(19) Histochemical analysis of transgenic plants and their progeny showed that the maize Adh1 promoter is constitutively expressed in root caps, anthers, anther filaments, pollen, scutellum, endosperm and shoot and root meristem of the embryo.
(20) In situ hybridization showed localization of the 1.1-kilobase rice lectin mRNA in root caps and specific cell layers of the radicle, coleorhiza, scutellum, and coleoptile.
Thallus
Definition:
(n.) A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a flat stratum or expansion, but sometimes erect or pendulous, and elongated and branching, and forming the substance of the thallogens.
Example Sentences:
(1) Peripheral hyphae were separated from the remaining thallus of Rhizoctonia solani in exponential and stationary phases of growth.
(2) The plasmalemma of thallus cells of the aquatic liverwort, Riccia fluitans, is reversibly depolarized by L- and D-serine.
(3) Their variations depend on the physiological and biochemical states of the thallus and on the conditions of extraction and purification.
(4) Thallus development, zoospore size, zoospore ultrastructural complexity and organization, and flagellum length are cited as important in phylogeny of the Chytridiales (chytrids) and should be the bases for this classification.
(5) Previous results showed that cell disintegration in the fungus Podospora anserina occured through the action of two proteases, enzymes whose messengers were normally latent during the extension stage of the thallus.
(6) There are no significant differences in the durrent density over the thallus cell.
(7) Little bromoperoxidase activity was obtained when fresh thallus material was extracted in Tris buffer.
(8) Incipient zoospores are produced from a multinucleate eucarpic thallus and devlop within cleavage vacuoles containing flagella.
(9) The action spectra of light reaction I, we found under these conditions, are very similar to the thallus absorption, whilst the action spectra of light reaction II show, besides strong bands of the phycobilins, only minor bands of chlorophyll a, which account for only 10-20% of the total chlorophyll.
(10) When a particulate enzyme preparation from the thallus of A. niger was incubated with GDP-[(14)C]mannose, the main radioactive products were mannose 1-phosphate (57% of products) and mannose (18%).
(11) In the presence of 10(-5) to 10 (-8) M carbonyl cyanide m-chlorophenylhydrazone (CCCP) the membrane potential of thallus cells of the aquatic liverwort Riccia fluitans responds to changes of the external pH between 5.5 and 8.3.
(12) Many things, in Thoreau's liberated state, are worth the while to see - the feeding manners of chickadees, and the trickles of spring thaw along the railroad cut, "resembling, as you look down on them, the laciniated lobed and imbricated thalluses of some lichens".
(13) By the four-cell stage, chloroplasts of the rhizoid cells have weakly staining lamellae, while chloroplasts of the thallus cells are actively dividing with deeply staining lamellae.
(14) These observations are interpreted as evidence that the thallus of A. niger contains a mannose transferase that uses the phosphate of exo-methylene-hexahydropolyprenols as an acceptor.
(15) This study demonstrates that it is possible to select for more and more toxigenic strains or for less and less active ones starting with the same thallus.
(16) Bromoperoxidase I (which has been described before) was located inside the thallus, particularly around the conceptacles, whereas bromoperoxidase II was present at the thallus surface of the alga.
(17) Using fluorescein isothiocyanate-labeled lectins of various specificities, differences in the cell wall polysaccharide composition among the different parts of the thallus and during the cycle of S communis were demonstrated.
(18) We selected three mutant strains in which the constitutive activity of the protease messengers was expressed by an arrest of growth early in development (10 to 30 hours after spore germination) and a reaction of cell disintegration, in the thallus, suppressible with beta-phenyl pyruvic acid, a protease inhibitor.
(19) The enzyme activity is first detected in a few algae undergoing aplanosporogenesis and later in medullary hyphae that reach the dividing algae by elongating perpendicularly to the thallus surface.
(20) The thallus and life cycle of Neocallimastix R1 are compared with those of aerobic chytrids.