Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Far red light

Volotovski ID, Sokolovsky SG, Nikiforov EL, Zinchenko VP. Calcium oscillations in plant cell cytoplasm induced by red and far-red light irradiation. J Photochem Photobiol 1993 20 95-100. [Pg.89]

Figure 23-48 Absorption spectra of red (Pr) and far-red (Pfr) forms of purified oat phytochrome following saturating irradiations with red and far-red light. See Quail616 and Anderson et al.617... Figure 23-48 Absorption spectra of red (Pr) and far-red (Pfr) forms of purified oat phytochrome following saturating irradiations with red and far-red light. See Quail616 and Anderson et al.617...
Figure 3. The effect of wavelength on the germination of lettuce seeds which were initially irradiated to establish 50% germination. Additional red light (600-700 nm) further promotes germination most efficiently, whereas far-red light (700-750 nm) inhibits germination. (Action spectrum after Flint and Alister [15].)... Figure 3. The effect of wavelength on the germination of lettuce seeds which were initially irradiated to establish 50% germination. Additional red light (600-700 nm) further promotes germination most efficiently, whereas far-red light (700-750 nm) inhibits germination. (Action spectrum after Flint and Alister [15].)...
Kereiakes, D.J. et al. (2003) Phase I drug and light dose-escalation trial of motexafin lutetium and far red light activation (phototherapy) in subjects with coronary artery disease undergoing percutaneous coronary intervention and stent deployment procedural and long-term results, Circulation 108, 1310-1315. [Pg.422]

In plastids of etiolated radish seedlings, far-red light stimulated the synthesis of all prenyl chains, but it did not alter the relative concentrations of the various chains synthesized under dark conditions. White light further stimulated chain synthesis, particularly the formation of phytyl chains,370 and a similar situation occurred with barley.371 In contrast, both far-red and white light changed the pattern of carotenoid synthesis in etioplasts of Raphanus seedlings372 and it seems that phytochrome in its excited state controls light-induced synthesis of carotenoid. This synthesis was also... [Pg.210]

For cyclic electron flow, an electron from the reduced form of ferredoxin moves back to the electron transfer chain between Photosystems I and II via the Cyt bCyclic electron flow does not involve Photosystem II, so it can be caused by far-red light absorbed only by Photosystem I — a fact that is often exploited in experimental studies. In particular, when far-red light absorbed by Photosystem I is used, cyclic electron flow can occur but noncyclic does not, so no NADPH is formed and no O2 is evolved (cyclic electron flow can lead to the formation of ATP, as is indicated in Chapter 6, Section 6.3D). When light absorbed by Photosystem II is added to cells exposed to far-red illumination, both CO2 fixation and O2 evolution can proceed, and photosynthetic enhancement is achieved. Treatment of chloroplasts or plant cells with the 02-evolution inhibitor DCMU [3-(3,4-dichlorophenyl)-l, 1-dimethyl urea], which displaces QB from its binding site for electron transfer, also leads to only cyclic electron flow DCMU therefore has many applications in the laboratory and is also an effective herbicide because it markedly inhibits photosynthesis. Cyclic electron flow may be more common in stromal lamellae because they have predominantly Photosystem I activity. [Pg.269]

An optical filter passes only far red light with an average wavelength of 6500 A. Calculate (a) the wavelength in nanometers and centimeters, (b) the wave number in centimeters", and (c) the frequency. [Pg.325]

In the meantime, Witt and colleagues observed similar effects on the redox state of cytochrome / when red and far-red light were alternately used for illumination. They also observed similar two-light effects with respect to a species that was later identified as plastoquinone, as well as another species, P700 discovered earlier by Kok. Fig. 17 (A) shows the spectroscopic results of the two-light effect on P700 in broken spinach chloroplasts. Illumination of chloroplasts with 720-nm light of 0.5- ec duration... [Pg.24]

Rumberg et al. measured an absorption change due to plastoquinone that is known to be located on the reducing side of the PS-II reaction center. An absorption decrease at 254 nm attributable to the reduction of plastoquinone could be induced by a 638-nm flash. This photoreduced plastoquinone could then be completely reoxidized by far-red light at 720 nm. It was also noted that the electron-transfer reactions in the re-reduction of P700 and re-oxidation of reduced PQ were kinetically coupled. [Pg.26]

Govindjee, S Ichimura, C Cederstrand and E Rabinowitch (1960) Effect of combining far-red light with shorter wave lighten the excitation of fluorescence In Chlorella. Arch Biochem Biophys 89 322-323... [Pg.45]


See other pages where Far red light is mentioned: [Pg.284]    [Pg.585]    [Pg.585]    [Pg.146]    [Pg.74]    [Pg.1299]    [Pg.1317]    [Pg.1337]    [Pg.232]    [Pg.232]    [Pg.234]    [Pg.374]    [Pg.335]    [Pg.343]    [Pg.343]    [Pg.344]    [Pg.344]    [Pg.344]    [Pg.344]    [Pg.391]    [Pg.138]    [Pg.69]    [Pg.20]    [Pg.222]    [Pg.222]    [Pg.256]    [Pg.257]    [Pg.267]    [Pg.64]    [Pg.371]    [Pg.371]    [Pg.104]    [Pg.131]    [Pg.213]    [Pg.359]    [Pg.22]    [Pg.25]    [Pg.283]    [Pg.379]    [Pg.379]   
See also in sourсe #XX -- [ Pg.261 ]




SEARCH



FARS

Red lights

© 2024 chempedia.info