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21.
Munshi G Mustafa Sudhir Raniwala T Awes B Rai RS Bhalerao JG Contreras RV Gavai SK Ghosh P Jaikumar GC Mishra AP Mishra H Mishra B Mohanty J Nayak J-Y Ollitrault SC Phatak L Ramello R Ray PK Sahu AM Srivastava DK Srivastava VK Tiwari 《Pramana》2006,67(5):961-981
This is the report of Heavy Ion Physics and Quark-Gluon Plasma at WHEPP-09 which was part of Working Group-4. Discussion and
work on some aspects of quark-gluon plasma believed to have created in heavy-ion collisions and in early Universe are reported. 相似文献
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Abstract— A study of the 518-mμ light-induced absorbance change in green cells and a comparison with photosynthetic O2 evolution were made. The effect of various chemical agents was also investigated. On the one hand, no antagonistic two-light effect was observed on the absorbance change, and DCMU had only a partial inhibitory effect on it. On the other hand, it was possible to observe in some cases an indirect kinetic relationship between O2 evolution and 518-mμ change. It is suggested that probably at least two substances absorb around 518-mμ, one ( X I ) belonging to system I and another ( X II ) to system II. The existence and the function of X I are hypothetical and the identity of X II with the first photoproduct of system II is yet not well established. 相似文献
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Femtosecond photon echoes from band-to-band transitions in GaAs 总被引:1,自引:0,他引:1
Becker PC Fragnito HL Brito Cruz CH Fork RL Cunningham JE Henry JE Shank CV 《Physical review letters》1988,61(14):1647-1649
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THE FUNCTION OF P700 AND CYTOCHROME f IN THE PHOTOSYNTHETIC REACTION CENTER OF SYSTEM 1 IN RED ALGAE
Abstract— Kinetics and quantum yields of light-induced oxidation of P700 and the f -type cytochrome were measured in marine red algae from absorbance changes in the region 420, 435 and 705 nm. The quantum yield for cytochrome oxidation in Iridaea splendens and Schizymenia pacifica was 0.5-0.65 in far-red light, at 20 and at 0C.
Oxidation rates of P700 measured when varying amounts of cytochrome were in the oxidized state indicated that a reaction center of system 1 in Iridaea contains 1 P700 and 4 cytochrome molecules. Oxidized P700 only accumulates when all 4 cytochromes are oxidized. The rate of photochemistry of system 1, measured as the sum of the rates of P700 and cytochrome oxidation, was independent of the oxidation level of cytochrome, but decreased with accumulation of oxidized P700. This decrease was less than proportional to the fraction of P700 that was in the oxidized state, which suggested transfer of excitation energy between reaction centers.
The quantum yield for cytochrome oxidation after dark periods of 1 min or more was only about 0.2. This effect was tentatively ascribed to a dark reduction of the cytochrome coupled to phosphorylation. 相似文献
Oxidation rates of P700 measured when varying amounts of cytochrome were in the oxidized state indicated that a reaction center of system 1 in Iridaea contains 1 P700 and 4 cytochrome molecules. Oxidized P700 only accumulates when all 4 cytochromes are oxidized. The rate of photochemistry of system 1, measured as the sum of the rates of P700 and cytochrome oxidation, was independent of the oxidation level of cytochrome, but decreased with accumulation of oxidized P700. This decrease was less than proportional to the fraction of P700 that was in the oxidized state, which suggested transfer of excitation energy between reaction centers.
The quantum yield for cytochrome oxidation after dark periods of 1 min or more was only about 0.2. This effect was tentatively ascribed to a dark reduction of the cytochrome coupled to phosphorylation. 相似文献
25.
Shashwati Sen DK Aswal Ajay Singh TV Chandrasekhar Rao KP Muthe JC Vyas LC Gupta SK Gupta VC Sahni 《Pramana》2002,58(5-6):867-870
The MgB2 superconductor, synthesized using solid-state and liquid-phase sintering methods, have been characterized for various properties.
The upper critical field, irreversibility line and critical current density have been determined using magnetization data.
The current-voltage characteristics recorded under an applied magnetic field revealed the existence of vortex glass transition.
The surface analysis using X-ray photoelectron spectroscopy shows that MgB2 is sensitive to atmospheric degradation. 相似文献
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T Madhusoodhanan Samit Mandal MP Sathyavathiamma Ramani NG Puttaswamy TS Mudhole A Mandal DK Avasthi R Shyam SK Datta 《Pramana》1999,53(3):541-544
The inclusive and exclusive measurements were carried out for 7Li projectile breakup on 27Al target at 48 MeV. In the inclusive data we have observed a broad peak around the beam velocity for alphas and tritons.
The exclusive data for alpha-triton coincidences show good agreement with the post-form DWBA theory of breakup reactions. 相似文献
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