scholarly journals High iron requirement for growth, photosynthesis, and low-light acclimation in the coastal cyanobacterium Synechococcus bacillaris

2015 ◽  
Vol 6 ◽  
Author(s):  
William G. Sunda ◽  
Susan A. Huntsman
Keyword(s):  
Light Acclimation ◽  
Low Light ◽  
High Iron ◽  
Iron Requirement

State transitions revisited—a buffering system for dynamic low light acclimation of Arabidopsis

2006 ◽  
Vol 62 (4-5) ◽  
Author(s):  
Tikkanen Mikko ◽  
Piippo Mirva ◽  
Suorsa Marjaana ◽  
Sirpiö Sari ◽  
Mulo Paula ◽  
...  
Keyword(s):  
Light Acclimation ◽  
State Transitions ◽  
Low Light

Seagrass light acclimation: 2-DE protein analysis in Posidonia leaves grown in chronic low light conditions

2009 ◽  
Vol 374 (2) ◽  
pp. 113-122 ◽  
Author(s):  
Silvia Mazzuca ◽  
Antonia Spadafora ◽  
Dina Filadoro ◽  
Candida Vannini ◽  
Milena Marsoni ◽  
...  
Keyword(s):  
Protein Analysis ◽  
Light Acclimation ◽  
Light Conditions ◽  
Low Light

scholarly journals High-light vs. low-light: Effect of light acclimation on photosystem II composition and organization in Arabidopsis thaliana

2013 ◽  
Vol 1827 (3) ◽  
pp. 411-419 ◽  
Author(s):  
Roman Kouřil ◽  
Emilie Wientjes ◽  
Jelle B. Bultema ◽  
Roberta Croce ◽  
Egbert J. Boekema
Keyword(s):  
Arabidopsis Thaliana ◽  
Photosystem Ii ◽  
High Light ◽  
Light Acclimation ◽  
Light Effect ◽  
Low Light ◽  
Effect Of Light

Do light acclimation mechanisms reduce the effects of light-dependent herbicides in duckweed (Lemna minor)?

Weed Science ◽  
2006 ◽  
Vol 54 (02) ◽  
pp. 230-236 ◽  
Author(s):  
Unai Artetxe ◽  
Antonio Hernández ◽  
José I. García-Plazaola ◽  
José M. Becerril
Keyword(s):  
Oxidative Stress ◽  
Lemna Minor ◽  
Protoporphyrin Ix ◽  
Light Acclimation ◽  
Cellular Damage ◽  
Membrane Disruption ◽  
Protective Mechanism ◽  
Low Light ◽  
Xanthophylls Cycle

This research studies whether photoprotection mechanisms are able to counterbalance the short-term effect of two herbicides, acifluorfen methyl (AFM) and paraquat (PQ), that generate photo-oxidative stress in different subcellular locations. Duckweed plants grown under three light intensities (high-, medium-, and low light), and consequently expressing three levels of photoprotection, were exposed to both herbicides under the same light regime. Oxidative damage induced by AFM originated mainly from the cytosolic accumulation of protoporphyrin IX, leading to a process of plasma membrane disruption, a progressive and slow degradation of ascorbate and photosynthetic pigments, and glutathione accumulation. As most photoprotective mechanisms (antioxidants and xanthophylls-cycle-related energy dissipation) operate mainly within the chloroplast, these systems were unable to protect plants from AFM damage irrespective of the level of light acclimation. Paraquat effects developed more rapidly and to a greater extent than AFM in treated plants. Irrespective of the light intensity, the same sequence of degradation was observed: ascorbate followed by glutathione, α-tocopherol, pigments, and membrane disruption. In PQ-treated plants the generation of oxidative stress occurred mainly in the chloroplast, and cellular damage developed more slowly in highly photoprotected plants (high light); in fact, electrolyte leakage can be used as a marker for PQ tolerance. The effects of both herbicides indicate that the xanthophyll cycle is an early protective mechanism and confirms the central role of ascorbate in early photoprotection response. High levels of lipophilic and hydrophilic antioxidant contents did not lead to attenuated phytotoxicity of acifluorfen methyl and thus are not the basis to explain differential susceptibilities among duckweed plants.

scholarly journals State transitions revisited—a buffering system for dynamic low light acclimation of Arabidopsis

2006 ◽  
Vol 62 (4-5) ◽  
pp. 795-795 ◽  
Author(s):  
Mikko Tikkanen ◽  
Mirva Piippo ◽  
Marjaana Suorsa ◽  
Sari Sirpiö ◽  
Paula Mulo ◽  
...  
Keyword(s):  
Light Acclimation ◽  
State Transitions ◽  
Low Light

Software pattern recognition applied to nanodiffraction patterns from a STEM instrument

1986 ◽  
Vol 44 ◽  
pp. 694-695
Author(s):  
G.Y. Fan ◽  
J.M. Cowley
Keyword(s):  
Image Processing ◽  
Pattern Recognition ◽  
Computer Software ◽  
Processing System ◽  
Light Level ◽  
Host Computer ◽  
Low Light ◽  
Image Processing System ◽  
Recent Developments ◽  
On Line

In recent developments, the ASU HB5 has been modified so that the timing, positioning, and scanning of the finely focused electron probe can be entirely controlled by a host computer. This made the asynchronized handshake possible between the HB5 STEM and the image processing system which consists of host computer (PDP 11/34), DeAnza image processor (IP 5000) which is interfaced with a low-light level TV camera, array processor (AP 400) and various peripheral devices. This greatly facilitates the pattern recognition technique initiated by Monosmith and Cowley. Software called NANHB5 is under development which, instead of employing a set of photo-diodes to detect strong spots on a TV screen, uses various software techniques including on-line fast Fourier transform (FFT) to recognize patterns of greater complexity, taking advantage of the sophistication of our image processing system and the flexibility of computer software.

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