The role of energy

Among the technological processes that require significant energy consumption, a significant role is played by the heating processes carried out by electric infrared heaters.

8p lucastanguyen 01-06-2020 13 1   Download

The study reflects as how on one hand the needs of market has to be catered and on the other, consumer interest has to be protected by the regulator. The study encompasses an overview of the Indian energy sector.

15p guineverehuynh 21-06-2020 14 2   Download

This paper describes the preparation, optical properties and the role of the concentration of rare earth ions (RE: Eu, Er, Tb, Yb) as active centers in the energy transfer of Y2O3: RE nanophosphors. The materials are prepared by the combustion method using urea or glycine. Nanoparticles can be prepared with sizes ranging from 5 to 100 nm and can be estimated by high resolution TEM. Optimization of Eu and Er content in these nanophosphors was reported. The effect of energy transfer between Tb and Eu and the up-conversion between Er and Yb were studied.

8p 12120609 01-06-2020 15 1   Download

Today, nuclear power produces 11% of the world’s electricity. Nuclear power plants produce virtually no greenhouse gases or air pollutants during their operation. Emissions over their entire life cycle are very low.

8p christabelhuynh 29-05-2020 8 2   Download

The design of b-glycosidases with planed substrate specificity for biotechnological application has received little attention. This is mostly a consequence of the lack of data on the molecular basis of the b-glycosidase specificity, namely data on the energy of the noncovalent interactions in the enzymetransition state complex. In an attempt to fill this gap, sitedirected mutagenesis and enzyme steady-state kinetic experiments with different substrates were conducted, using as model a digestive b-glycosidase (glycoside hydrolase family 1) from Spodoptera frugiperda (Lepidoptera) (Sfbgly50).

10p system191 01-06-2013 41 4   Download

Department of Medical Biochemistry and Biology, University of Bari, Italy; 2Department of Zoology, Laboratory of Histology and Comparative Anatomy, University of Bari, Italy; 3Center for the Study of Mitochondria and Energy Metabolism (CNR) Bari, Italy Mitochondrial bioenergetic impairment has been found in the organelles isolated from rat liver during the prereplicative phase of liver regeneration.

9p system191 01-06-2013 35 4   Download

Mikrobiologisches Institut der Eidgeno¨ssischen Technischen Hochschule, ETH-Zentrum, Zu¨rich, Switzerland The membrane-bound b subunit of the oxaloacetate decarboxylase Na+ pump of Klebsiella pneumoniae catalyzes the decarboxylation of enzyme-bound biotin. This event is coupled to the transport of 2 Na+ ions into the periplasm and consumes a periplasmically derived proton. The connecting fragment IIIa and transmembrane helices IV and VIII of the b subunit are highly conserved, harboring residues D203, Y229, N373, G377, S382, and R389 that play a profound role in catalysis. ...

8p system191 01-06-2013 33 4   Download

Uncoupling protein-3 (UCP3) is a mitochondrial innermembrane protein abundantly expressed in rodent and human skeletal muscle which may be involved in energy dissipation. Many studies have been performed on the metabolic regulation of UCP3 mRNA level, but little is known about UCP3 expression at the protein level. Two populations of mitochondria have been described in skeletal muscle, subsarcolemmal (SS) and intermyofibrillar (IMF), which differ in their intracellular localization and possibly also their metabolic role....

7p system191 01-06-2013 35 4   Download

In an effort to explore the role of glycine clusters on the cold adaptation of enzymes, we designed point mutations aiming to alter the distribution of glycine residues close to the active site of the psychrophilic alkaline phosphatase from the Antarctic strain TAB5. The mutagenesis targets were residues Gly261 and Gly262. The replacement of Gly262 by Ala resulted in an inactive enzyme. Substitution of Gly261 by Ala resulted to an enzyme with lower stability and increased energy of activation.

6p research12 01-06-2013 37 5   Download

Na + /K + -ATPase as an energy transducing ion pump has beenstudiedextensivelysince itsdiscovery in1957.Although early findings suggested a role for Na + /K + -ATPase in regulation of cell growth and expression of various genes, only in recent years the mechanisms through which this plasma membrane enzyme communicates with the nucleus have been studied.

6p research12 29-04-2013 31 4   Download

Heterodisul®de reductase (Hdr) is a unique disul®de reduc-tase that plays a key role in the energy metabolism of methanogenic archaea. The genome of the sulfate-reducing archaeonArchaeoglobus fulgidusencodes several proteins of unknown function with high sequence similarity to the catalytic subunit of Hdr. Here we report on the puri®cation of a multisubunit membrane-bound enzyme complex from A.

10p research12 23-04-2013 46 2   Download

Adaptations of the kinetic properties of mitochondria in striated muscle lacking cytosolic (M) and⁄or mitochondrial (Mi) creatine kinase (CK) iso-forms in comparison to wild-type (WT) were investigated in vitro. Intact mitochondria were isolated from heart and gastrocnemius muscle of WT and single- and double CK-knock-out mice strains (cytosolic (M-CK –⁄ – ), mitochondrial (Mi-CK –⁄ – ) and double knock-out (MiM-CK –⁄ – ), respect-ively).

10p awards 05-04-2013 40 5   Download

NA helicases are ubiquitous molecular motor proteins which harness the chemical free energy of ATPhydrolysis to catalyze the unwinding of energetically stable duplex DNA, and thus play important roles in nearly all aspects of nucleic acid metabolism, including replication, repair, recombina-tion, and transcription. They break the hydrogen bonds between the duplex helix and move unidirectionally along the bound strand. All helicases are also translocases and DNA-dependentATPases.Most contain conserved helicase motifs that act as an engine to power DNA unwinding. ...

14p dell39 03-04-2013 37 5   Download

Heterodisulfide reductase (Hdr) is a unique disulfide reduc-tase that plays a key role in the energy metabolism of methanogenic archaea. Two types of Hdr have been identi-fied and characterized from distantly related methanogens. Here we show that the sulfate-reducing archaeonArchaeo-globus profunduscultivated on H2/sulfate forms enzymes related toboth typesofHdr.Fromthemembrane fractionof A. profundus, a two-subunit enzyme (HmeCD) composedof ab-type cytochrome and a hydrophilic iron–sulfur protein was isolated. ...

11p dell39 03-04-2013 33 3   Download

Rad51 and disrupted meiotic cDNA1 (Dmc1) are the two eukaryotic DNA recombinases that participate in homology search and strand exchange reactions during homologous recombination mediated DNA repair. Rad51 expresses in both mitotic and meiotic tissues whereas Dmc1 is confined to meiosis.

10p inspiron33 26-03-2013 54 5   Download

Alternative oxidase (AOX) is a ubiquitous respiratory enzyme found in plants, fungi, protists and some bacterial species. One of the major ques-tions about this enzyme is related to its metabolic role(s) in cellular physi-ology, due to its capacity to bypass the proton-pumping cytochrome pathway, and as a consequence it has great energy-wasting potential.

13p inspiron33 23-03-2013 47 4   Download

Folate plays a critical role in maintaining normal metabolic, energy, differ-entiation and growth status of all mammalian cells. The intestinal folate uptake is tightly and diversely regulated, and disturbances in folate homeo-stasis are observed in alcoholism, attributable, in part, to intestinal mal-absorption of folate.

12p media19 05-03-2013 37 3   Download

An NADH oxidase (NOX) was cloned from the genome ofThermococ-cus profundus (NOXtp) by genome walking, and the encoded protein was purified to homogeneity after expression in Escherichia coli.Subsequent analyses showed that it is an FAD-containing protein with a subunit molecular mass of 49 kDa that exists as a hexamer with a native molecular mass of 300 kDa.

11p vinaphone15 28-02-2013 39 3   Download

MicroRNAs (miRNAs) are involved in a plethora of important biological processes, from embryonic development to homeostasis in adult tissues. Recently, miRNAs have emerged as a class of epigenetic regulators of metabolism and energy homeostasis.

11p viettel02 22-02-2013 34 3   Download

Signal transducers and activators of transcription (STATs) regulate a vari-ety of cellular functions, including differentiation and proliferation. STAT3 and STAT5 are known to play important roles in brain processes, such as energy homeostasis and neuronal development. We isolated a novel splicing variant ofSTAT5Afrom a cDNA library of the mouse brainstem.

12p viettel02 20-02-2013 32 4   Download