High temperature oxidation

Thermostable and highly water-soluble polymers are essential for polymer flooding — one of the most effective methods used in the enhanced oil recovery (EOR) in hightemperature (HT) offshore reservoirs. In this research, the copolymerization reaction of acrylamide (AM) and N-vinylpyrrolidone (NVP) monomers were performed via a freeradical mechanism induced by gamma-rays (γ-rays) irradiation.

79p viabigailjohnson 10-06-2022 16 4   Download

Study of high temperature steam oxidation kinetics during the high temperature oxidation was carried out on the sponge base E110 cladding tubes material in the temperature range 600–1300 °C. The oxidation kinetics derived from the weight gain measurements showed a parabolic rate law for temperatures 1100 °C and higher only.

6p christabelhuynh 30-05-2020 12 1   Download

This work aims at determining the key parameters controlling the average oxygen profile within the sample in the two-phase regions at 1200 °C. High temperature steam oxidation tests interrupted by water quench were performed using pre-hydrided Zircaloy-4 samples.

8p christabelhuynh 30-05-2020 10 0   Download

The thermal stabilityofperoxidase fromleavesof theAfrican oil palm treeElaeis guineensis(AOPTP) at pH 3.0 was studied by differential scanning calorimetry (DSC), intrinsic fluorescence, CD and enzymatic assays.The spectral parameters asmonitoredby ellipticity changes in the far-UV CD spectrum of the enzyme as well as the increase in tryp-tophan intensity emission upon heating, together with changes in enzymatic activity with temperature were seen to be good complements to the highly sensitive but integral methodofDSC....

7p research12 29-04-2013 45 3   Download

High hydrostatic pressure induced cold inactivation of carboxypeptidase Y. Carboxypeptidase Y was fully active when exposed to subzero temperature at 0.1 MPa; however, the enzyme became inactive when high hydrostatic pressure and subzero temperature were both applied. When the enzyme was treated at pressures higher than 300 MPa and temperatures lower than)5
C, it underwent an irreversible inactivation in which nearly 50% of the a-helical structure was lost as judged by circular dichroism spectral analysis....

9p research12 23-04-2013 41 4   Download

A100-kDa proteinwith endoglucanase activitywas purified from Triton X-100 extract of cells of the thermoacidophilic Gram-positive bacterium Alicyclobacillus acidocaldarius. The enzyme exhibited activity towards carboxy methyl cel-lulose and oat spelt xylan with pH and temperature optima of 4 and 80
C, respectively. Cloning and nucleotide sequence analysis of the corresponding gene (celB) revealed an ORF encoding a preprotein of 959 amino acids which is consistent with an extracellular localization.

10p tumor12 20-04-2013 34 2   Download

A highly purified cytochromeb6f complex from the cyanobacterium Syn-echocystissp. PCC 6803 selectively binds one chlorophyll a and one caro-tenoid in analogy to the recent published structure from two other b6 f complexes. The unknown function of these pigments was elucidated by spectroscopy and site-directed mutagenesis. Low-temperature redox differ-ence spectroscopy showed red shifts in the chlorophyll and carotenoid spec-tra upon reduction of cytochrome b6, which indicates coupling of these pigments with the heme groups and thereby with the electron transport....

11p awards 05-04-2013 38 3   Download

Work on the relationship between hyperthermophile protein dynamics, sta-bility and activity is reviewed. Neutron spectroscopy has been applied to measure and compare the macromolecular dynamics of various hyper-thermophilic and mesophilic proteins, under different conditions.

10p media19 04-03-2013 37 2   Download