منابع مشابه
Photosynthetic Efficiency of Marine Plants
Multicellular marine plants were collected from their natural habitats and the quantum efficiency of their photosynthesis was determined in the laboratory in five narrow wave length bands in the visible spectrum. The results along with estimates of the relative absorption by the various plastid pigments show a fairly uniform efficiency of 0.08 molecules O(2) per absorbed quantum for (a) chlorop...
متن کاملUV radiation effects on pigments, photosynthetic efficiency and DNA of an Antarctic marine benthic diatom community
The impact of ultraviolet radiation (UVR) on a semi-natural, soft-bottom diatom community from Potter Cove, King Georg Island, Antarctica, was investigated. The objective was to estimate the impact of UV-B (280 to 320 nm) and UV-A (320 to 400 nm) on photosynthetic efficiency, pigments, DNA damage and repair. The diatom community was exposed to different doses of radiation treatments: PAR + UV-A...
متن کاملConcerns of resistant markers in marine ecosystem transformed plants
World population growth and requirement to global food security, application of genetic engineering and utilization of transgenic organisms have made more important. Using this technology, without regarding to its risks, can cause loses to environment. To generate transgenic organisms, selection systems are applied that cause to selective growth of transformed cells. Antibiotic resistance genes...
متن کاملPhotosynthetic Action Spectra of Marine Algae
A polarographic oxygen determination, with tissue in direct contact with a stationary platinum electrode, has been used to measure the photosynthetic response of marine algae. These were exposed to monochromatic light, of equal energy, at some 35 points through the visible spectrum (derived from a monochromator). Ulva and Monostroma (green algae) show action spectra which correspond very closel...
متن کاملGrowth and Photosynthetic Responses of Wheat Plants
Crowth and photosynthesis of wheat (Triticum aestivum 1. cv Super DwarO plants grown onboard the space shuttle Discovery for 10 d were examined. Compared to ground control plants, the shoot fresh weight of space-grown seedlings decreased by 25%. Postflight measurements of the O, evolution/photosynthetic photon flux density response curves of leaf samples revealed that the C0,-saturated photosyn...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1954
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.38.2.282-t