Blue algae

Blue Algae, such as cyanophyta, appear as unicellular threads they have a typical blue colour and they are able to bind elementary nitrogen. 

The first colonizers of a bare rock are often bacteria and green-blue algae. They dissolve some of the more soluble components in the rock through an exchange reaction between the acids they secrete and the... 

The presence of considerable amounts of P in wastewaters due to the run-off of fertilizers, and industrial and household discharges, is a major problem, because destructive blue algae blooms may develop in natural waters, where under normal conditions the Pi concentration is most often the limiting factor for algae growth (Godd and Bell, 1985). 

The only reactions of molecular nitrogen at ambient temperature are the formation of lithium nitride Li3N, reactions with certain transition metal complexes, and nitrogen fixation with nitrogenase in the bacteria of the root nodules of legumes and in blue algae (Sections 14.1.1 and 14.1.2). Above 500 °C nitrogen reacts with some elements, especially with metals (nitride formation). 

Dichlone is primarily used as a fungicide. It is especially effective for brown rot of stone fruit and scab on apples and pears. Dichlone is also used to control blue algae. There are no registered uses for dichlone in the United States. 

Further, a marine antibiotic, (—)-malyngolide, discovered recently in the marine blue alga Lyngbya majuscula Gomont and the vitamin E precursor chromanmetha-nol were synthesized in high e. e. by utilizing this asymmetric reaction (Scheme 6 and 7). 

Toxins formed by various strains of the cyanobacterium Anabaena flos-aquae ( blue algae ) which often cause animal poisonings. 

C28H43NO6, Mr 489.65, [a]D-49.2 (CH2CI2). A cyclic depsipeptide antibiotic from the blue alga (cyanobacterium) Hapalosiphon welwitschii. H. is able to counteract the resistance of certain tumor cells to cytostatic agents and thus (experimentally) potentiates the action of anti-cancer drugs. 

CijHiiNOj, Mr 289.29, orange-colored powder, mp. 320 °C (decomp.). An unusual indole derivative from the terrestrial blue alga Nostoc commune. N. inhibits the formation of spindles during mitosis in sea urchin eggs. 

Open chain tetrapyrroles of this kind are also found in plants. Those from blue algae and algae in which they are combined with proteins are... 

The phytochrome system is widely distributed in plants, even if in small concentrations. It can be extracted without too much difficulty, particularly from seedlings. Phytochrome suspended in a test-tube can also be converted from one form into the other by irradiation with RL or FRL. It has been shown that phytochrome is a chromoproteid. The pigment bound to protein in this chromoproteid is related to certain pigments of blue algae and algae. It is a phycobilin, thus, in principle, a chain of four pyrrole rings which are linked with each other by C atoms (Fig. 180). 

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