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Requirements for Photosynthesis

Regardless of medium or any other experimental condition, growth occurs only in the light. [Pg.105]

Maximal growth rate occurs at a light intensity of 3000 lux. [Pg.105]


By catalyzing the oxidation of organic matter, the redox reactions conducted by the heterotrophs serve to restore the reduced atoms in the organic compounds back to their oxidized forms. During these reactions, electrons supplied by the organic matter cause O2, NO3, SO4 , and CO2 to be reduced to H2O, N2, H2S, and CH4, respectively. The oxidation of organic matter regenerates the CO2 required for photosynthesis. [Pg.205]

Figures 6.3 and 6.4 show a conceptual flowchart of the energy in an ecological system. The energy input during time interval t is provided by solar radiation EA(t, ip, A, z), as is the upward transport of nutrients from deep-sea layers. The concentration of nutrients B6A(t,ip, A,z) at depth z is determined by photosynthesis RpA, advection, and destruction of suspended dead organic matter B-j. The role played by hydro-dynamic conditions relates to maintenance of the concentration of nutrients required for photosynthesis which occurs via transport from other layers or aquatories of the sea where the concentration is sufficiently high. Taking into account the designations of Table 6.7 we have... Figures 6.3 and 6.4 show a conceptual flowchart of the energy in an ecological system. The energy input during time interval t is provided by solar radiation EA(t, ip, A, z), as is the upward transport of nutrients from deep-sea layers. The concentration of nutrients B6A(t,ip, A,z) at depth z is determined by photosynthesis RpA, advection, and destruction of suspended dead organic matter B-j. The role played by hydro-dynamic conditions relates to maintenance of the concentration of nutrients required for photosynthesis which occurs via transport from other layers or aquatories of the sea where the concentration is sufficiently high. Taking into account the designations of Table 6.7 we have...
The two main pathways for the uptake of toxic substances by plants are through their root systems and across their leaf cuticles. Stomata, the specialized openings in plant leaves that allow carbon dioxide required for photosynthesis to enter the leaves and oxygen and water vapor to exit, are also routes by which toxic substances may enter plants. The mechanisms by which plants take up systemic pesticides and herbicides, which become distributed within the plant, have been studied very intensvively. [Pg.121]

Light plays a vital role in the life of all oceans. At the simplest level, it provides one of the basic requirements for photosynthesis and promotes development of a food chain. Some species of fish that live in the darker reaches of the oceans also rely on light for survival. Some of these species, such as lantern fish, have even developed their own artificial means of generating light. [Pg.62]

Colorless, allowing light required for photosynthesis to reach considerable depths in water body ... [Pg.93]

Gene expression in cyanobacteria, whether on a self-replicating plasmid or integrated in the genome, needs to be driven by a specific promoter that can be recognized by the host. Only a limited number of promoters have been evaluated for this purpose in cyanobacteria [50]. Most known promoters are native to the host organism from genes required for photosynthesis and expressed in relatively... [Pg.586]

Ley AC, Mauzerall DC Absolute absorption cross-sections for photosystem II and the minimum quantum requirement for photosynthesis in Chtoretta vulgaris, Biochim Biophys Acta Bioenerg 680(1) 95-106, 1982. [Pg.254]

These properties are very important in the zone of the continental shelves because light is the principal requirement for photosynthesis, and thus is the underlying engine of primary production, at the base of aU the food chains (Zika, 1981). Two phenomena play an essential role ... [Pg.15]


See other pages where Requirements for Photosynthesis is mentioned: [Pg.29]    [Pg.327]    [Pg.38]    [Pg.34]    [Pg.277]    [Pg.44]    [Pg.29]    [Pg.553]    [Pg.190]    [Pg.485]    [Pg.140]    [Pg.4082]    [Pg.53]    [Pg.71]    [Pg.400]    [Pg.519]    [Pg.34]    [Pg.98]    [Pg.620]    [Pg.414]    [Pg.3843]    [Pg.105]    [Pg.777]    [Pg.115]    [Pg.1]   


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