1,721,026 research outputs found
The Mechanism of Rubisco Catalyzed Carboxylation Reaction: Chemical Aspects Involving Acid-Base Chemistry and Functioning of the Molecular Machine
No full textIn recent years, a great deal of attention has been paid by the scientific community to improving the efficiency of photosynthetic carbon assimilation, plant growth and biomass production in order to achieve a higher crop productivity. Therefore, the primary carboxylase enzyme of the photosynthetic process Rubisco has received considerable attention focused on many aspects of the enzyme function including protein structure, protein engineering and assembly, enzyme activation and kinetics. Based on its fundamental role in carbon assimilation Rubisco is also targeted by the CO2-fertilization effect, which is the increased rate of photosynthesis due to increasing atmospheric CO2-concentration. The aim of this review is to provide a framework, as complete as possible, of the mechanism of the RuBP carboxylation/hydration reaction including description of chemical events occurring at the enzyme “activating” and “catalytic” sites (which involve Broensted acid-base reactions) and the functioning of the complex molecular machine. Important research results achieved over the last few years providing substantial advancement in understanding the enzyme functioning will be discussed
The role of metal centres in reduction and carboxylation reactions utilizing carbon dioxide
No full textA review, including metal systems as catalysts, mode of bonding of CO2 to metal centers, reactivity of coordinated CO2, and carboxylation and reduction reactions
Mechanism of formation of Rh- and Ni-peroxocarbonates and their utilisation in olefin oxidation and carbonation reactions. Experimental and theoretical studies.
No full text
Direct synthesis of organic carbonates by oxidative carboxylation of olefins catalyzed by metal oxides: developing green chemistry based on carbon dioxide
No full textCarbon dioxide utilization in chemical industry
No full textA review with 6 refs. of carbon dioxide utilization in chem. industry. Carbon dioxide mitigation technologies and disposal of carbon dioxide are also describe
Tetraphenylborate coordination chemistry and reactivity of coordinated BPh4- anion. Syntheis, characterization and properties of mono- and polynuclear Rh(h6.BPh4) complexes
No full textIn this paper the synthesis and characterization of tetraphenylborate transition -metal complexes are discussed. BPh4- is shown to act as a 2- to24-electron donor. Some specific features of the reactivity of tetraphenylborate anion in the presence of transition metal centers are also discussed. The ability of BPh4- to act as a "total" phenylating agent is documented
Branch Making Shells: A multi-agent systems application for the formation of shell branched structures
No full textThis research explores an application of multi-agent systems to the generation of singlelayer branched shell structures for architectural application. The study is prompted by the structure and pattern-making capacity of climbing plants’ growth behaviours, in which growth history (affected by internal local processes and environmental conditions), generates a multi-performant outcome. The digital system merges parts of the Space Colonization Algorithm (SCA) with agent-based logic, leveraging iterative local interactions to coherently embed environmental conditions and static requirements in the production of a coherent structural network on a boundary surface, which is translated in a beams-and-nodes glued laminated timber structure. The paper exposes the method and its applications to the case study of a pavilion, discussing geometric constructability’s challenges and limits
- …
