38,169 research outputs found
The clinical meaning of histamine skin reactivity
The definition of the “atopic state”, i.e. subjects presenting at least one skin wheal with a minimum diameter of 3
mm induced by an allergen skin-prick test (ASPT), is based on the assumption that wheal size depends entirely on
the amount of histamine produced in the antigen-antibody reaction. Several epidemiological studies have, however,
demonstrated that an ASPT-elicited wheal is heavily modulated by “histamine skin reactivity” (HSR), i.e. the size of
the wheal induced by a prick test performed with a given solution of histamine. HSR not only varies widely
depending on the individual characteristics and geographical setting, but also changes over time; these differences
in HSR markedly influence the amount of specific IgE required to produce a wheal of at least 3 mm in an ASPT. We
should therefore ideally conceive the existence of two types of” atopic patients”: one type in whom “atopy” is mainly
the result of an increased level of specific IgE antibodies, and another type in whom positive ASPTs are mainly the
result of marked skin reactivity to even small amounts of histamine. If hyper-reactivity to histamine occurs not only in
the skin but in parallel also in other parts of the organism, especially at the mucosal level, “normal” histamine
production may cause chronic or recurrent clinical symptom
Evolution of relativistic polytropes in the post--quasi--static regime
A recently presented method for the study of evolving self-gravitating
relativistic spheres is applied to the description of the evolution of
relativistic polytropes. Two different definitions of relativistic polytrope,
yielding the same Newtonian limit, are considered. Some examples are explicitly
worked out, describing collapsing polytropes and bringing out the differences
between both types of polytropes.Comment: 42 pages, 7 figures; accepted for publication in GR
- …