Photosynthetic cells

Xem 1-14 trên 14 kết quả Photosynthetic cells
  • This minireview covers the research carried out in recent years into differ-ent aspects of the function of the flavoproteins involved in cyanobacterial photosynthetic electron transfer from photosystem I to NADP + , flavodox-in and ferredoxin–NADP + reductase. Interactions that stabilize protein– flavin complexes and tailor the midpoint potentials in these proteins, as well as many details of the binding and electron transfer to protein and ligand partners, have been revealed.

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  • Research in starch biosynthesis is likely to have a great impact on agriculture and industry in coming years. Although the original purpose of research into starch synthesis was not industrial application, it is an example of how science, while trying to answer fundamental questions, may lead to the manipulation of nature for beneficial purposes. Although the basic studies of starch synthesis were carried out in England during the 1940s, and led to the discovery of phosphorylase and Q-enzyme (branching enzyme), the basis of our modern ideas originated in Argentina from the work of Luis F.

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  • The objective of this research is to study of microbial lipid production by locally photosynthetic microalgae and oleaginous yeast via integrated cultivation technique using CO2 emissions from yeast fermentation. A maximum specific growth rate of Chlorella sp. KKU-S2 of 0.284 (1/d) was obtained under an integrated cultivation and a maximum lipid yield of 1.339g/L was found after cultivation for 5 days, while 0.969g/L of lipid yield was obtained after day 6 of cultivation time by using CO2 from air. A high value of volumetric lipid production rate (QP, 0.

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  • The functional replacement of the primary ubiquinone (QA) in the photosynthetic reaction center (RC) from Rhodo-bacter sphaeroideswith synthetic vitamin K derivatives has provided a powerful tool to investigate the electron transfer mechanism. To investigate the binding mode of these qui-nones to theQAbinding sitewe have determined the binding free energy and charge recombination rate from QA ± to D + (kAD) of 29 different 1,4-naphthoquinone derivatives with systematically altered structures.

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  • Frataxin, a conserved mitochondrial protein implicated in cellular iron homeostasis, has been involved as the iron chaperone that delivers iron for the Fe–S cluster and heme biosynthesis. However, its role in iron metabo-lism remains unclear, especially in photosynthetic organisms.

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  • Symbiosis between cnidarian and photosynthetic protists is widely distri-buted over temperate and tropical seas. These symbioses can periodically breakdown, a phenomenon known as cnidarian bleaching. This event can be irreversible for some associations subjected to acute and⁄or prolonged envi-ronmental disturbances, and leads to the death of the animal host.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Wertheim cung cấp cho các bạn kiến thức về ngành y đề tài: Transcriptome analysis of functional differentiation between haploid and diploid cells of Emiliania huxleyi, a globally significant photosynthetic calcifying cell...

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  • Exposure ofArabidopsis thalianaplants to high levels of light revealed specific phosphorylation of a 40 kDa protein in photosynthetic thylakoid membranes. The protein was identified by MS as extracellular calcium-sensing receptor (CaS), previously reported to be located in the plasma membrane.

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  • Distribution of photosystem II (PSII) extrinsic proteins was examined using antibodies raised against various extrinsic proteins from different sources. The results showed that a glaucophyte (Cyanophora paradoxa) having the most primitive plastids contained the cyanobacterial-type extrinsic proteins (PsbO, PsbV, PsbU), and the primitive red algae (Cyanidium caldarium) contained the red algal-type extrinsic proteins (PsO, PsbQ¢, PsbV, PsbU), whereas a prasinophyte (Pyraminonas parkeae), which is one of the most primitive green algae, contained the green algal-type ones (PsbO, PsbP, PsbQ)....

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  • The photosynthetic protein complexes in plants are located in the chloroplast thylakoid membranes. These membranes have an ultrastructure that consists of tightly stackedÔgranaÕ regions interconnectedbyunstackedmembrane regions.The structure of isolated granamembranes has been studiedhere by cryo-electron microscopy. The data reveals an unusual arrangement of the photosynthetic protein complexes, staggered over two tightly stacked planes.

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  • The osmoregulated periplasmic glucans (OPGs) produced byRhodobacter sphaeroides, a free-living organism, were isolated by trichloracetic acid treatment and gel permeation chromatography. Compounds obtained were characterized by compositional analysis, matrix-assisted laser desorption ionization mass spectrometry and nuclear magnetic resonance.R. sphaeroidespredominantly synthesizes acyclic glucan containing 18 glucose residues that canbe substituted by one to seven succinyl esters residues at the C6position of some of the glucose residues, and by one or two acetyl resi-dues....

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  • The charged quaternary ammonium compounds – methyl, ethyl and benzyl viologens – generate reactive oxygen species in photosynthetic cells. Three independent methyl viologen-resistant spontaneous mutants of Synechocys-tis sp. PCC 6803 were identified, in which the conserved R115 residue of the Slr1174 protein was replaced with G115, L115 and C115. The Slr1174 protein of the DUF990 family is related to the permease subunit of an ABC-2-type transporter and its R115 mutation was found to be solely responsible for the observed methyl viologen resistance. ...

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  • In some cases, the larger cells may be further distinguished based on their scattering characteristics (coccolithophorids) or the presence of both PE and chlorophyll (cryptophytes) (Olson et al., 1989; Collier & Campell, 1999). Many authors have reported the distributions and dynamics of each photosynthetic group in the water column in different marine environments (Li, 1995; Campbell & Vaulot, 1993; Vaulot & Marie, 1999).

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  • Yamanaka et al. AMB Express 2011, 1:24 ORIGINAL Open Access Reduction of exogenous ketones depends upon NADPH generated photosynthetically in cells of the cyanobacterium Synechococcus PCC 7942 Rio Yamanaka1*, Kaoru Nakamura2 and Akio Murakami3 Abstract Effective utilization of photosynthetic microorganisms as potential biocatalysts is favorable for the production of useful biomaterials and the reduction of atmospheric CO2. For example, biocatalytic transformations are used in the synthesis of optically active alcohols.

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