Rate exchange rather than relaxation controls structural recovery

2019 ◽  
Vol 21 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Birte Riechers ◽  
Ranko Richert
Keyword(s):  
Homogeneous Process ◽  
Structural Recovery

Observing frequency invariant aging dynamics suggests that the homogeneous process of rate exchange rather than heterogeneous relaxation governs structural recovery.

Recrystallization of metamict allanite

2011 ◽  
Vol 75 (4) ◽  
pp. 2393-2399 ◽  
Author(s):  
T. Beirau ◽  
C. Paulmann ◽  
U. Bismayer
Keyword(s):  
Crystal Structure ◽  
Igneous Rocks ◽  
Accessory Mineral ◽  
Recrystallization Process ◽  
Radioactive Elements ◽  
X Ray Diffraction ◽  
Geological Time ◽  
Α Decay ◽  
X Ray ◽  
Structural Recovery

AbstractAllanite is a common accessory mineral in igneous rocks. Allanite becomes metamict over geological time-scales as a result of the α-decay of radioactive elements in the crystal structure. This study focuses on the recrystallization of metamict allanite from Savvushka, Russia. The structural recovery produced by annealing was investigated by X-ray powder diffraction, single-crystal synchrotron X-ray diffraction and infrared spectroscopy. A kinetic analysis is presented that shows that the recrystallization process proceeds by at least two different mechanisms.

scholarly journals Integrating knowledge in the face of epistemic uncertainty: Dialogically drawing distinctions

2018 ◽  
Vol 49 (5) ◽  
pp. 595-612 ◽  
Author(s):  
Jeanne Mengis ◽  
Davide Nicolini ◽  
Jacky Swan
Keyword(s):  
Knowledge Integration ◽  
Interdisciplinary Collaboration ◽  
Epistemic Uncertainty ◽  
Ethnographic Study ◽  
Homogeneous Process ◽  
The Face ◽  
Over Time

In this article, we contribute to a processual understanding of knowledge integration in interdisciplinary collaboration by foregrounding the role of dialogue in dealing with epistemic uncertainty. Drawing on an ethnographic study of collaboration among scientists involved in developing a highly novel bioreactor, we suggest that knowledge integration is not a homogeneous process but requires switching between different knowledge integration practices over time. This is particularly notable in the case of ‘epistemic breakdowns’ – deeply unsettling events where hitherto-held understandings of the nature of problems appear unworkable. In such cases, it is not sufficient to deal solely with coordination issues; collaborators need to find ways to address generative knowledge integration processes and to venture, collectively, into the unknown. We demonstrate how this generative quest of knowledge integration is achieved through a dialogical process of drawing and testing new distinctions that allows actors to gradually handle the epistemic uncertainty they face.

scholarly journals Urinary angiotensinogen as a biomarker for acute to chronic kidney injury transition – prognostic and mechanistic implications

2018 ◽  
Vol 132 (21) ◽  
pp. 2383-2385 ◽  
Author(s):  
Katie L. Connor ◽  
Laura Denby
Keyword(s):  
Kidney Injury ◽  
Renin Angiotensin System ◽  
Ischaemia Reperfusion Injury ◽  
Angiotensin System ◽  
Urinary Angiotensinogen ◽  
Tubular Necrosis ◽  
Ischaemia Reperfusion ◽  
Structural Recovery ◽  
Chronic Kidney Injury ◽  
Injury Model

Accurate biomarkers that both predict the progression to, and detect the early stages of chronic kidney disease (CKD) are lacking, resulting in difficulty in identifying individuals who could potentially benefit from targeted intervention. In a recent issue [Clinical Science (2018) 132, 2121–2133], Cui et al. examine the ability of urinary angiotensinogen (uAGT) to predict the progression of acute kidney injury (AKI) to CKD. They principally employ a murine ischaemia reperfusion injury model to study this and provide data from a small prospective study of patients with biopsy proven acute tubular necrosis. The authors suggest that uAGT is a dynamic marker of renal injury that could be used to predict the likelihood of structural recovery following AKI. Here we comment on their findings, exploring the clinical utility of uAGT as a biomarker to predict AKI to CKD transition and perhaps more controversially, to discuss whether the early renin–angiotensin system blockade following AKI represents a therapeutic target.

Structural recovery mechanism after shear induced orientation of multiwalled carbon nanotube in polypropylene matrix

2017 ◽  
Vol 63 ◽  
pp. 475-483 ◽  
Author(s):  
Sina Ghiassinejad ◽  
Behnaz Ranjbar ◽  
Ali Hosseinpour ◽  
Aliasghar Katbab ◽  
Hossein Nazockdast
Keyword(s):  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Recovery Mechanism ◽  
Structural Recovery ◽  
Polypropylene Matrix

scholarly journals Stability and structural recovery of the tetramerization domain of p53-R337H mutant induced by a designed templating ligand

2008 ◽  
Vol 105 (43) ◽  
pp. 16426-16431 ◽  
Author(s):  
S. Gordo ◽  
V. Martos ◽  
E. Santos ◽  
M. Menendez ◽  
C. Bo ◽  
...  
Keyword(s):  
Structural Recovery ◽  
Tetramerization Domain

On the solution of compartmental processes and their use in modelling stages of infection of a disease with reference to onchocerciasis

1987 ◽  
Vol 24 (02) ◽  
pp. 293-303
Author(s):  
F. W. O. Saporu
Keyword(s):  
Laplace Transform ◽  
Infection Process ◽  
Residence Times ◽  
Prevalence Data ◽  
Homogeneous Process ◽  
Migration Rates ◽  
Endemic Diseases

The solution of a hierarchicaln-compartmental homogeneous process with multiple-valued migration rates is obtained using Laplace transform techniques. Such models are suggested for modelling the infection process of endemic diseases because of their property of gamma-distributed compartmental residence times in each ofncompartments. Its relevance to the onchocerciasis infection process (with and without the imposition of controls) is discussed and application to age-prevalence data (having only two infective states into which an individual can be classified) is undertaken.

Structural recovery behaviour of kaolin, bentonite and K-montmorillonite slurries

2012 ◽  
Vol 223 ◽  
pp. 105-109 ◽  
Author(s):  
Clara Eunjee Lee ◽  
Stefanus Chandra ◽  
Yee-Kwong Leong
Keyword(s):  
Structural Recovery
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