Search results
Results From The WOW.Com Content Network
Prothallus of the tree fern Dicksonia antarctica (note new moss plants for scale) Spore-bearing plants , like all plants, go through a life-cycle of alternation of generations . The fully grown sporophyte , what is commonly referred to as the fern , produces genetically unique spores in the sori by meiosis .
At the heart of a photosystem lies the reaction center, which is an enzyme that uses light to reduce and oxidize molecules (give off and take up electrons). This reaction center is surrounded by light-harvesting complexes that enhance the absorption of light. In addition, surrounding the reaction center are pigments which will absorb light. The ...
[167] [168] The shock is not created by the star, but by its powerful stellar wind as it ejects vast amounts of gas into the interstellar medium at a speed of 17 km/s, heating the material surrounding the star, thereby making it visible in infrared light. [169] Because Betelgeuse is so bright, it was only in 1997 that the bow shock was first ...
With the exception of calicioid lichens, lichen growth forms are based on the appearance of the thallus, which is the vegetative (non-reproductive) part of the lichen. [5]
The one spore cell can now divide into two and continue to develop into a small heart-shaped object called ‘prothallus’, [12] which looks very similar to a liverwort and can therefore be mistaken for it. On the underside of the prothallus, the male reproductive organs are located, while the female ones are at the top. [11]
The culture at large seems to be primarily operating under the following formula: Penis + Vagina = Sex, Orgasm, Sexuality, Sensuality, Happiness. And when that equation doesn’t quite add up, the automatic assumption isn’t: “Something is wrong with the equation.” The assumption is: “Something is wrong with me. I am broken. I am lacking.”
Lepraria species are usually restricted to tree bases, while Verseghya thysanophora is commonly found higher up on the trunk and can form large patches. Lecanora expallens is similar in colour, but has a more coastal distribution, contains different chemical compounds, and has a bluish-grey prothallus.
A chemical property referring to a substance's ability to turn reddish-brown in the presence of Melzer's reagent or iodine due to the presence of dextrins. This color reaction is also called hemiamyloid or pseudoamyloid. [137] determinate Having well-defined or clearly marked edges. [138] Contrast: effuse. diagnosis