Sökning: "Far-red light"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Far-red light.

1. 1. The Far-Red Limit of Photosynthesis

   Författare :Fredrik Mokvist; Stenbjörn Styring; Tomáš Polívka; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Far-red light; Photosystem I; Photosystem II; P700; P680; EPR; Charge Separation; Chemistry with specialization in Molecular Biomimetics; Kemi med inriktning mot molekylär biomimetik;

   Sammanfattning : The photosynthetic process has the unique ability to capture energy from sunlight and accumulate that energy in sugars and starch. This thesis deals with the light driven part of photosynthesis. LÄS MER

3. 2. Secondary chlorophyll a luminescence decay kinetics from green algae and higher plants : mechanisms and application

   Författare :Lars-Göran Sundblad; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; luminescence; fluorescence; photosynthesis; far red; CO2 accumulation; S-states; QA; reverse coupling; qE; frost hardiness;

   Sammanfattning : Barley protoplasts were shown to be a suitable experimental system for studies on the relative maximum during the decay of luminescence observed in most photosynthetic systems after excitation with far red light and in the presence of O2. The far red induced relative luminescencemaximum was shown to be a result of three coinciding events:*Randomization of the S-states of the water splitting system during illumination with far red light. LÄS MER

4. 3. Epigenetic Regulation of Light and Hormonal Signaling in Arabidopsis thaliana

   Författare :Kristina Rizzardi; Annika Sundås-Larsson; Katarina Landberg; Johan Memelink; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TERMINAL FLOWER2; auxin; jasmonate; epigenetics; photomorphogenesis; Plant physiology; Växtfysiologi; Biologi med inriktning mot fysiologisk botanik; Biology with specialization in Physiological Botany;

   Sammanfattning : Plants are stationary and need to adapt to the environment they live in. Integration of environmental cues, such as changes in light and temperature, can occur either directly or through the action of hormones. Hormone and light signaling leads to rapid changes in gene expression, and eventually changes in protein levels. LÄS MER

5. 4. Studies of the two redox active tyrosines in Photosystem II

   Författare :Nigar Ahmadova; Fikret Mamedov; Stenbjörn Styring; Robert Burnap; Uppsala universitet; []
   Nyckelord :Photosystem II; Tyrosine Z and D; proton-coupled electron transfer;

   Sammanfattning : Photosystem II is a unique enzyme which catalyzes light induced water oxidation. This process is driven by highly oxidizing ensemble of four Chl molecules, PD1, PD2, ChlD1 and ChlD2 called, P680. Excitation of one of the Chls in P680 leads to the primary charge separation, P680+Pheo-. LÄS MER

7. 5. Photophosphorylation as mediated by vitamin K₃ in broken spinach chloroplasts

   Författare :Mohamed Usamah Duraini; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The effects of DCMU on menadione or menadione sodium bisulphite (MSB) mediated photophosphorylation in broken chloroplasts kept in a Tricine or in a HEPES buffer at either high (131 W m-2) or low irradiance (57 W m-2) in combination with NaN3, KCN, under white, red or far red light, were studied.Some combinations of the factors tested created a system where DCMU inhibited cyclic ATP formation, whereas other combinations created a system insensitive to DCMU or even with a stimulation of ATP formation by presence of the inhibitor. LÄS MER