Results 271 to 280 of about 438,222 (313)

Effect of mechanical activation on alkali leaching of chromite ore

Transactions of Nonferrous Metals Society of China, 2010
Mechanical activation was used to improve the extraction of chromium in molten NaOH. It is observed that the extraction ratio reaches 97% after leaching for 200 min when chromite ore is mechanically activated for 10 min, but only 34% if not activated ...
Shi-Li Zheng, Hao Du
exaly   +2 more sources

Kaolinite structural modifications induced by mechanical activation [PDF]

Applied Clay Science, 2023
This study presents novel characterisation techniques to evaluate the effects of mechanical activation (MA) on the kaolinite structure. MA was achieved with a planetary ball mill at various times and rotation speeds to get different activation degrees. A
Jofre Manosa, Jaume Calvo-De la Rosa, A Silvello   +2 more
exaly   +2 more sources

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Mechanisms of plasminogen activation

Journal of Internal Medicine, 1994
The fibrinolytic system consists of an inactive proenzyme, plasminogen, that is converted by plasminogen activators to the active enzyme, plasmin, that degrades fibrin. Two immunologically distinct plasminogen activators have been identified: tissue-type plasminogen activator (t-PA) and urokinase-type plasminogen activator (u-PA).
H R, Lijnen, F, Bachmann, D, Collen, V, Ellis, H, Pannekoek, D C, Rijken, S, Thorsen   +6 more
openaire   +2 more sources

Kaolin-based geopolymers: Effect of mechanical activation and curing process

Construction and Building Materials, 2013
International audienceThe present work aimed to investigate the influence of mechanical activation of raw kaolin on the final compressive strength of as-obtained geopolymers regarding the curing profile.
Gisele Laure Lecomte-Nana, Philippe Blanchart   +1 more
exaly   +2 more sources

Towards sustainable solutions for fly ash through mechanical activation

Resources, Conservation and Recycling, 2007
This paper is a critical overview on fly ash utilisation with emphasis on mechanical activation of fly ash in developing processes for medium to high volume utilisation of fly ash.
Rakesh Kumar, Sanjay Kumar
exaly   +2 more sources

Mechanisms of ATM Activation

Annual Review of Biochemistry, 2015
The ataxia-telangiectasia mutated (ATM) protein kinase is a master regulator of the DNA damage response, and it coordinates checkpoint activation, DNA repair, and metabolic changes in eukaryotic cells in response to DNA double-strand breaks and oxidative stress.
openaire   +2 more sources

MECHANISMS OF ZYMOGEN ACTIVATION

Annual Review of Biophysics and Bioengineering, 1977
It is now well recognized that proteolytic enzymes play key roles in the regulation of or control over the action of other proteins (1-3). Such enzymes can be found in all species from bacteria to man and in control of diverse systems, which include hormone production, bacteriophage assembly (4), development, fertilization (5), digestion, defense ...
R M, Stroud, A A, Kossiakoff, J L, Chambers   +2 more
openaire   +2 more sources

The mechanism of the activation of papain

Biochemical and Biophysical Research Communications, 1969
Abstract The predominant form of inactive papain prepared by the method of Kimmel and Smith (1) is shown to be a mixed disulfide formed between a sulfhydryl group on the enzyme and cysteine. Reduction or other nucleophilic cleavage of this bond frees the active thiol of papain and stoichiometric amounts of free cysteine or cysteine whose sulfur atom ...
I B, Klein, J F, Kirsch
openaire   +2 more sources

Mechanisms of caspase activation

Current Opinion in Cell Biology, 2003
The core effectors of apoptosis encompass proteolytic enzymes of the caspase family, which reside as latent precursors in most nucleated metazoan cells. A majority of studies on apoptosis are based on the assumption that caspase precursors are activated by cleavage, a common mechanism for most protease zymogen activations.
Kelly M, Boatright, Guy S, Salvesen
openaire   +2 more sources