67 research outputs found
An infinite family of convex Brunnian links in
This paper proves that convex Brunnian links exist for every dimension by constructing explicit examples. These examples are three-component
links which are higher-dimensional generalizations of the Borromean rings.Comment: 10 pages, 4 figure
Metabolic Syndrome and Periodontitis: Is Oxidative Stress a Common Link?
Ponencia basada en este artÃculo en la 2nd International Mediterranean Meeting - Nutrition and Metabolism, Granada, 2010A review of pathological mechanisms that can explain the relationship between periodontitis and cardiovascular disease (CVD) is necessary to improve the management of both conditions. Metabolic syndrome is a combination of obesity, hypertension, impaired glucose tolerance or diabetes, hyperinsulinemia, and dyslipidemia. All these have been examined in recent years in terms of their relationship to periodontitis. Reviewed data indicate an association between some of them (body mass index, high-density lipoprotein-cholesterol [HDL-C], triglycerides, high blood pressure, among others) and periodontitis. Oxidative stress may act as a potential common link to explain relationships between each component of metabolic sÃndrome and periodontitis. Both conditions show increased serum levels of products derived from oxidative damage, with a pro-inflammatory state likely influencing each other bidirectionally. Adipocytokines might modulate the oxidant/anti-oxidant balance in this relationship
Size Doesn't Matter: Towards a More Inclusive Philosophy of Biology
notes: As the primary author, O’Malley drafted the paper, and gathered and analysed data (scientific papers and talks). Conceptual analysis was conducted by both authors.publication-status: Publishedtypes: ArticlePhilosophers of biology, along with everyone else, generally perceive life to fall into two broad categories, the microbes and macrobes, and then pay most of their attention to the latter. ‘Macrobe’ is the word we propose for larger life forms, and we use it as part of an argument for microbial equality. We suggest that taking more notice of microbes – the dominant life form on the planet, both now and throughout evolutionary history – will transform some of the philosophy of biology’s standard ideas on ontology, evolution, taxonomy and biodiversity. We set out a number of recent developments in microbiology – including biofilm formation, chemotaxis, quorum sensing and gene transfer – that highlight microbial capacities for cooperation and communication and break down conventional thinking that microbes are solely or primarily single-celled organisms. These insights also bring new perspectives to the levels of selection debate, as well as to discussions of the evolution and nature of multicellularity, and to neo-Darwinian understandings of evolutionary mechanisms. We show how these revisions lead to further complications for microbial classification and the philosophies of systematics and biodiversity. Incorporating microbial insights into the philosophy of biology will challenge many of its assumptions, but also give greater scope and depth to its investigations
Surface oxide reduction by hydrogen permeation through iron foil detected using a scanning Kelvin probe
The interaction of atomic hydrogen with the air-formed surface oxide film of an iron foil, following cathodic hydrogen evolution on the reverse face, is shown to produce significant Volta potential changes which can be mapped using a scanning Kelvin probe (SKP). The magnitude of the Volta potential depression decreases with holding time following hydrogen charging and exhibits a dependence upon the oxygen partial pressure of the holding environment. It is proposed that the Volta potential depression observed in the area of hydrogen emergence results from a change in the ratio of FeIII/FeII states within the surface oxide. Keywords: Scanning Kelvin probe, Hydrogen, Diffusion, Iron, Volta potentia
Metabolic Syndrome and Periodontitis: Is Oxidative Stress a Common Link?
A review of pathological mechanisms that can
explain the relationship between periodontitis
and cardiovascular disease (CVD) is necessary to
improve the management of both conditions.
Metabolic syndrome is a combination of obesity,
hypertension, impaired glucose tolerance or diabetes, hyperinsulinemia, and dyslipidemia. All these
have been examined in recent years in terms of their
relationship to periodontitis. Reviewed data indicate
an association between some of them (body mass
index, high-density lipoprotein-cholesterol [HDL-C],
triglycerides, high blood pressure, among others)
and periodontitis. Oxidative stress may act as a
potential common link to explain relationships
between each component of metabolic syndrome
and periodontitis. Both conditions show increased
serum levels of products derived from oxidative
damage, with a pro-inflammatory state likely influencing each other bidirectionally. Adipocytokines
might modulate the oxidant/anti-oxidant balance in
this relationship.Universita Politecnica delle Marche, ItalyGrupo de investigacion CTS113 Junta de Andalucia, Spai
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