Structural requirements of quinone coenzymes for endogenous and dye-mediated coupled electron transport in bacterial photosynthesis

1980 ◽  
Vol 12 (3-4) ◽  
pp. 95-110 ◽  
Author(s):  
A. Baccarini-Melandri ◽  
N. Gabellini ◽  
B. A. Melandri ◽  
E. Hurt ◽  
G. Hauska
Keyword(s):  
Electron Transport ◽  
Bacterial Photosynthesis ◽  
Structural Requirements

scholarly journals Photosynlhetic Inhibitory Activity of Dihydro-β-agarofurans Sesquiterpenes from Maytenus dislicha and Maytenus boaria (Celastraceae)

2000 ◽  
Vol 55 (7-8) ◽  
pp. 631-637 ◽  
Author(s):  
Carlos Céspedes ◽  
Lahoucine Achnine ◽  
Julio Alarcón ◽  
José Becerra ◽  
Blas Lotina-Hennsen
Keyword(s):  
Electron Transport ◽  
Inhibitory Activity ◽  
Hill Reaction ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Structural Requirements ◽  
Aerial Parts ◽  
Site Of Action ◽  
Order Of Magnitude ◽  
Photosynthetic Activities

Abstract The effects of 9β-benzoyloxy-la, 2α, 6β, 8α, 15-pentaacetoxy-dihydro-β-agarofuran and 9β furoyloxy-1α, 6β, 8α-triacetoxy-dihydro-β-agarofuran, major phytogrowth inhibitors isolated from the aerial parts of Maytenus disticha (Celastraceae) and seeds of Maytenus boaria (Celastaraceae), respectively, on different photosynthetic activities of isolated spinach chloroplasts have been investigated. Photophosphorylation and electron transport (basal, phosphorylating and uncoupled) were inhibited in a concentration dependent manner by both compounds, therefore acting as Hill reaction inhibitors. The site of action of these natural compounds was located in the span from P680 to QA. 9β-benzoyloxy-1,2,6,8,15-pentaacetoxydihydro-β-agarofuran was one order of magnitude more potent (I50 = 2.6 μм) than 9β-furoyloxy-1,6,8,-triacetoxydihydro-β-agarofuran, suggesting that the substitution at C-9 and the acetoxy groups at carbons 2 and 15 are important structural requirements for the displayed inhibitory activity.

The role of ligands in electron transport in nanocrystal solids

Nanoscale ◽  
2020 ◽  
Vol 12 (45) ◽  
pp. 23028-23035
Author(s):  
Artem R. Khabibullin ◽  
Alexander L. Efros ◽  
Steven C. Erwin
Keyword(s):  
Electron Transport ◽  
Theoretical Modeling

Theoretical modeling of wavefunction overlap in nanocrystal solids elucidates the important role played by ligands in electron transport.

Transformation of scientific genres in the context of scientometric strategies

2020 ◽  
Vol 7 (2) ◽  
pp. 272-282
Author(s):  
Vadim Viktorovich Dementyev
Keyword(s):  
Structural Requirements ◽  
Modern Culture ◽  
The Core ◽  
Speech Genre ◽  
Quantitative Indicators

The transformation of scientific genres in the context of the general digitalization of modern culture is considered. It is shown that the speech genre content of this process is based on the mechanisms of generation and transformation of the text of two types, the interpretation of which can be useful in order to better understand the nature, tasks and tools of scientometry at this stage, and in order to better understand the speech genre structure of scientific speech. Firstly, the structural requirements for articles and monographs indexed in scientometric systems (Scopus, WoS, DOAJ, RSCI, etc.) are approved and streamlined, and thereby our knowledge of what an article is from its structure (i.e. knowledge about the genre of the article). Secondly, the requirements of indexing systems lead to the fact that the texts of articles change, they are “written differently”, and sometimes redone after appropriate recommendations from publishers. The points highlighted in scientometric systems can be understood as signs that an article must comply with in order to be assigned to the “speech genre of a scientific article”. The largest quantitative indicators for these items are indicators of how close to the core of the genre this or that text will turn out.

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