scholarly journals Proton production ind+Aucollisions and the Cronin effect

2004 ◽  
Vol 70 (3) ◽  
Author(s):  
Rudolph C. Hwa ◽  
C. B. Yang
Keyword(s):  
Cronin Effect ◽  
Proton Production

scholarly journals Influence of quark content and collision geometry on proton production in heavy ion collisions

2020 ◽  
Vol 1690 ◽  
pp. 012115
Author(s):  
D Larionova ◽  
A Berdnikov ◽  
Ya Berdnikov ◽  
D Kotov ◽  
Iu Mitrankov
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Proton Production ◽  
Quark Content

scholarly journals Cronin effect and high- suppression in the nuclear gluon distribution at small x

2004 ◽  
Vol 742 (1-2) ◽  
pp. 182-252 ◽  
Author(s):  
E. Iancu ◽  
K. Itakura ◽  
D.N. Triantafyllopoulos
Keyword(s):  
Gluon Distribution ◽  
Cronin Effect ◽  
Small X ◽  
Nuclear Gluon

scholarly journals Influence of rapid changes in cytosolic pH on oxidative phosphorylation in skeletal muscle: theoretical studies

2002 ◽  
Vol 365 (1) ◽  
pp. 249-258 ◽  
Author(s):  
Bernard KORZENIEWSKI ◽  
Jerzy A. ZOLADZ
Keyword(s):  
Skeletal Muscle ◽  
Creatine Kinase ◽  
Oxidative Phosphorylation ◽  
Kinetic Properties ◽  
Main Role ◽  
Anaerobic Glycolysis ◽  
Cytosolic Ph ◽  
Intensive Exercise ◽  
Proton Production ◽  
The Stability

Cytosolic pH in skeletal muscle may vary significantly because of proton production/consumption by creatine kinase and/or proton production by anaerobic glycolysis. A computer model of oxidative phosphorylation in intact skeletal muscle developed previously was used to study the kinetic effect of these variations on the oxidative phosphorylation system. Two kinds of influence were analysed: (i) via the change in pH across the inner mitochondrial membrane and (ii) via the shift in the equilibrium of the creatine kinase-catalysed reaction. Our simulations suggest that cytosolic pH has essentially no impact on the steady-state fluxes and most metabolite concentrations. On the other hand, rapid acidification/alkalization of cytosol causes a transient decrease/increase in the respiration rate. Furthermore, changes in pH seem to affect significantly the kinetic properties of transition between resting state and active state. An increase in pH brought about by proton consumption by creatine kinase at the onset of exercise lengthens the transition time. At intensive exercise levels this pH increase could lead to loss of the stability of the system, if not compensated by glycolytic H+ production. Thus our theoretical results stress the importance of processes/mechanisms that buffer/compensate for changes in cytosolic proton concentration. In particular, we suggest that the second main role of anaerobic glycolysis, apart from additional ATP supply, may be maintaining the stability of the system at intensive exercise.

HighpTcharged pion and proton production in GeV Au+Au and d+Au collisions

2004 ◽  
Vol 30 (8) ◽  
pp. S983-S987 ◽  
Author(s):  
Zhongbao Yin ◽  
(for the BRAHMS Collaboration)
Keyword(s):  
Proton Production

scholarly journals Rubisco proton production can drive the elevation of CO2 within condensates and carboxysomes

2020 ◽  
Author(s):  
Benedict M. Long ◽  
Britta Förster ◽  
Sacha B. Pulsford ◽  
G. Dean Price ◽  
Murray R. Badger
Keyword(s):  
Reaction Diffusion ◽  
Compartment Model ◽  
Low Light ◽  
Bisphosphate Carboxylase ◽  
Proton Production ◽  
Logical Sequence ◽  
Photosynthetic Carbon ◽  
Internal Ph ◽  
Novel Concept ◽  
Improved Function

ABSTRACTMembraneless organelles containing the enzyme Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) are a common feature of organisms utilizing CO2 concentrating mechanisms (CCMs) to enhance photosynthetic carbon acquisition. In cyanobacteria and proteobacteria, the Rubisco condensate is encapsulated in a proteinaceous shell, collectively termed a carboxysome, while some algae and hornworts have evolved Rubisco condensates known as pyrenoids. In both cases, CO2 fixation is enhanced compared with the free enzyme. Previous mathematical models have attributed the improved function of carboxysomes to the generation of elevated CO2 within the organelle via a co-localized carbonic anhydrase (CA), and inwardly diffusing HCO3- which has accumulated in the cytoplasm via dedicated transporters. Here we present a novel concept in which we consider the net of two protons produced in every Rubisco carboxylase reaction. We evaluate this in a reaction-diffusion, compartment model to investigate functional advantages these protons may provide Rubisco condensates and carboxysomes, prior to the evolution of HCO3- accumulation. Our model highlights that diffusional resistance to reaction species within a condensate allows Rubisco-derived protons to drive the conversion of HCO3- to CO2 via co-localized CA, enhancing both condensate [CO2] and Rubisco rate. Protonation of Rubisco substrate (RuBP) and product (PGA) plays an important role in modulating internal pH and CO2 generation. Application of the model to putative evolutionary ancestors, prior to contemporary cellular HCO3- accumulation, revealed photosynthetic enhancements along a logical sequence of advancements, via Rubisco condensation, to fully-formed carboxysomes. Our model suggests that evolution of Rubisco condensation could be favored under low CO2 and low light environments.

scholarly journals THREE-BODY PHOTODISINTEGRATION OF 4He NUCLEUS BY LINEARLY POLARIZED PHOTONS

2019 ◽  
pp. 11-15
Author(s):  
A.A. Peretiatko ◽  
R.T. Murtazin ◽  
A.F. Khodyachikh
Keyword(s):  
Magnetic Field ◽  
Cross Section ◽  
Production Cross ◽  
Reaction Products ◽  
Azimuthal Distribution ◽  
Proton Production ◽  
Linearly Polarized ◽  
Three Body ◽  
Polarized Photons ◽  
The Magnetic Field

Experimental data are reported from studies of the reaction 4He(γ, pn)d through the use of the streamer chamber placed in the magnetic field and exposed to a linearly polarized photon beam from the electron linac LUE-2000. A structure has been revealed in the momentum distribution of deuterons. Studies were made into the effects of nucleon-deuteron correlation. The azimuthal distribution of reaction products and the asymmetry of proton production cross-section were measured. The obtained data were analyzed in the framework of the quasideuteron model.

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