1,720,994 research outputs found
Chemical Waves
No full textIn our paper we try to describe the basic concepts
of chemical waves and spatial pattern formation
in a simple way. We pay particular attention to self-organisation
phenomena in extended excitable systems.
These result in the appearance of travelling waves,
spiral waves, target patterns, Turing structures or more
complicated structures called scroll waves, which are
three-dimensional systems. We describe the most
famous oscillating reaction, the Belousov–Zhabotinsky
(BZ) reaction, in greater detail. This is because it is of
great interest in both physical chemistry and in studies
on the evolution and sustenance of self-organising biological
systems
A Ternary nonequilibrium phase diagram for a closed unstirred Belousov-Zhabotinsky system
No full textIn order to analyze the fields of existence of the chaotic region as a function of initial concentration in a closed unstirred cerium catalyzed Belousov-Zhabotinsky system, a large number of experiments were carried out, varying the relative quantities of the three principal reactants (malonic acid, potassium bromate and cerium(IV)). A ternary bifurcation diagram is shown as a function of the percentage in volume of the three initial concentrations of reactants. Chaotic, quasi-periodic, periodic and no oscillations regions are clearly demonstrated
A ternary bifurcation diagram for a closed unstirred cerium catalyzed Belousov-Zhabotinsky System in function of the percent in volume of the major components of the system
No full textComparison of detergent‐based sample preparation workflows for LTQ‐Orbitrap analysis of the Escherichia coli proteome
No full textThis work presents a comparative evaluation of several detergent-based sample preparation workflows for the MS-based analysis of bacterial proteomes, performed using the model organism Escherichia coli. Initially, RapiGest- and SDS-based buffers were compared for their protein extraction efficiency and quality of the MS data generated. As a result, SDS performed best in terms of total protein yields and overall number of MS identifications, mainly due to a higher efficiency in extracting high molecular weight (MW) and membrane proteins, while RapiGest led to an enrichment in periplasmic and fimbrial proteins. Then, SDS extracts underwent five different MS sample preparation workflows, including: detergent removal by spin columns followed by in-solution digestion (SC), protein precipitation followed by in-solution digestion in ammonium bicarbonate or urea buffer, filter-aided sample preparation (FASP), and 1DE separation followed by in-gel digestion. On the whole, about 1000 proteins were identified upon LC-MS/MS analysis of all preparations (>1100 with the SC workflow), with FASP producing more identified peptides and a higher mean sequence coverage. Each protocol exhibited specific behaviors in terms of MW, hydrophobicity, and subcellular localization distribution of the identified proteins; a comparative assessment of the different outputs is presented
Comparative evaluation of seven commercial products for human serum enrichment/depletion by shotgun proteomics.
No full textChemical Waves
No full textIn our paper we try to describe the basic concepts of chemical waves and spatial pattern formation in a simple way. We pay particular attention to self-organisation phenomena in extended excitable systems. These result in the appearance of travelling waves, spiral waves, target patterns, Turing structures or more complicated structures called scroll waves, which are three-dimensional systems. We describe the most famous oscillating reaction, the Belousov-Zhabotinsky (BZ) reaction, in greater detail. This is because it is of great interest in both physical chemistry and in studies on the evolution and sustenance of self-organising biological systems
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Interplay between the Belousov-Zhabotinsky reaction-diffusion system and biomimetic matrices
No full textInteractions between reaction–diffusion systems and restricted host environments are a subject of widespread interest. In this work the
behaviour of the Belousov–Zhabotinsky reaction was investigated in lamellar phases formed by phospholipid bilayers with relevance for
biological systems. The influence of the reactive medium on the structure of the lipid matrix and, in turn, the influence of the matrix on
the dynamical evolution of chemical patterns, were studied by small angle scatterin
Antioxidant effects of Cagnulari grape marc extracts on two human endothelial cell models
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