9 research outputs found
Quantitative imaging of concentrated suspensions under flow
We review recent advances in imaging the flow of concentrated suspensions,
focussing on the use of confocal microscopy to obtain time-resolved information
on the single-particle level in these systems. After motivating the need for
quantitative (confocal) imaging in suspension rheology, we briefly describe the
particles, sample environments, microscopy tools and analysis algorithms needed
to perform this kind of experiments. The second part of the review focusses on
microscopic aspects of the flow of concentrated model hard-sphere-like
suspensions, and the relation to non-linear rheological phenomena such as
yielding, shear localization, wall slip and shear-induced ordering. Both
Brownian and non-Brownian systems will be described. We show how quantitative
imaging can improve our understanding of the connection between microscopic
dynamics and bulk flow.Comment: Review on imaging hard-sphere suspensions, incl summary of
methodology. Submitted for special volume 'High Solid Dispersions' ed. M.
Cloitre, Vol. xx of 'Advances and Polymer Science' (Springer, Berlin, 2009);
22 pages, 16 fig
Fragmentation Dynamics and Energy Partitioning in Dissociative Attachment on Triatomic Molecules
Epsilon-Fe2O3 is a novel intermediate for magnetite biosynthesis in magnetotactic bacteria
Principles of Minimally Invasive Surgery Applied to Oncology Patients
none6noneMattioli, Girolamo; Pio, Luca; Avanzini, Stefano; Granata, Claudio; Blanc, Thomas; Sarnacki, SabineMattioli, Girolamo; Pio, Luca; Avanzini, Stefano; Granata, Claudio; Blanc, Thomas; Sarnacki, Sabin
Low-waste fermentation-derived organic acid production by bipolar membrane electrodialysis—an overview
Dolichoectasia—an evolving arterial disease
Dolichoectasia is an arterial disease that causes dilatation and/or tortuosity of the affected vessel. The prevalence of dolichoectasia increases with age, and this disease is also associated with other traditional cardiovascular risk factors. Multiple pathophysiological processes might lead to the development of dolichoectatic vessels, and activation of metalloproteinases and irregular turbulent blood flow seem to cause irreversible disruption of the internal elastic lamina. Intracranial dolichoectasia commonly presents with ischemic or hemorrhagic stroke, and/or cranial neuropathies. The posterior circulation is more frequently affected by the dolichoectatic process than the anterior circulation. A positive diagnosis of dolichoectasia requires visual assessment of vessel shape and, if the posterior circulation is affected, application of Smoker's criteria. Reproducible criteria that aid diagnosis of dolichoectasia in the anterior circulation are lacking. No specific treatment for dolichoectasia exists, and the surgical and medical therapies that have been used to treat this condition have not been systematically evaluated. More evidence is needed to better understand the underlying dilatatory artheriopathy that causes this disease, and to determine whether patients with dolichoectasia might benefit from early diagnosis. In this article, we provide a comprehensive review of current knowledge regarding dolichoectasia, and highlight gaps in our knowledge to aid future research