38 research outputs found
Constructing Dirac linear fermions in terms of non-linear Heisenberg spinors
We show that the massive (or massless) neutrinos can be described as special
states of Heisenberg nonlinear spinors. As a by-product of this decomposition a
particularly attractive consequence appears: the possibility of relating the
existence of only three species of mass-less neutrinos to such internal
non-linear structure. At the same time it allows the possibility that neutrino
oscillation can occurs even for massless neutrinos
Star forming dwarf galaxies
Star forming dwarf galaxies (SFDGs) have a high gas content and low
metallicities, reminiscent of the basic entities in hierarchical galaxy
formation scenarios. In the young universe they probably also played a major
role in the cosmic reionization. Their abundant presence in the local volume
and their youthful character make them ideal objects for detailed studies of
the initial stellar mass function (IMF), fundamental star formation processes
and its feedback to the interstellar medium. Occasionally we witness SFDGs
involved in extreme starbursts, giving rise to strongly elevated production of
super star clusters and global superwinds, mechanisms yet to be explored in
more detail. SFDGs is the initial state of all dwarf galaxies and the relation
to the environment provides us with a key to how different types of dwarf
galaxies are emerging. In this review we will put the emphasis on the exotic
starburst phase, as it seems less important for present day galaxy evolution
but perhaps fundamental in the initial phase of galaxy formation.Comment: To appear in JENAM Symposium "Dwarf Galaxies: Keys to Galaxy
Formation and Evolution", P. Papaderos, G. Hensler, S. Recchi (eds.). Lisbon,
September 2010, Springer Verlag, in pres
Comparing the impact of different rescheduling strategies on the entropic-related complexity of manufacturing systems
Neuroendocrine–immune disequilibrium and endometriosis: an interdisciplinary approach
Endometriosis, a chronic disease characterized by endometrial tissue located outside the uterine cavity, affects one fourth of young women and is associated with chronic pelvic pain and infertility. However, an in-depth understanding of the pathophysiology and effective treatment strategies of endometriosis is still largely elusive. Inadequate immune and neuroendocrine responses are significantly involved in the pathophysiology of endometriosis, and key findings are summarized in the present review. We discuss here the role of different immune mechanisms particularly adhesion molecules, protein–glycan interactions, and pro-angiogenic mediators in the development and progression of the disease. Finally, we introduce the concept of endometrial dissemination as result of a neuroendocrine-immune disequilibrium in response to high levels of perceived stress caused by cardinal clinical symptoms of endometriosis
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Long COVID research: an update from the PHOSP-COVID Scientific Summit
The severity of acute SARS-CoV-2 infection has decreased with the introduction of public health policies, vaccination, improved management of acute disease, and a degree of protective immunity in those who have survived past infection. However, in the wake of the pandemic, post-acute sequelae of COVID-19—referred to as long COVID—have emerged. The UK National Institute for Health and Care Excellence (NICE) describes long COVID as a condition in which signs and symptoms continue or develop after acute COVID-19 (>4 weeks), including ongoing symptomatic COVID-19 and post-COVID-19 syndrome (≥12 weeks).PHOSP-COVID is jointly funded by a grant from the Medical Research Council UK Research and Innovation and the Department of Health and Social Care through the National Institute for Health Research (NIHR) rapid response panel to tackle COVID-19 (MR/V027859/1 and COV0319)
SpecScan: A utility program for generating numerical data from printed forms of spectra or other signals
Determination of chromium by electrothermal atomic absorption spectrometry with various chemical modifiers
The determination of Cr in the presence of various isomorphous metals
has been studied. The atomic absorption signal for Cr was increased and
stabilized by the presence of 20 mu g of Mg(NO3)(2), 1 mu g Rh and 1 mu
g Pt. Magnesium, Rh and Pt gave comparable characteristic masses of 3.2,
3.0 and 2.8 pg, respectively, when integrated absorbance was measured.
The limits of detection were .0.18, 0.14 and 0.091 mu g l(-1),
respectively, The efficiency of these modifiers was tested with the
direct determination of Cr in rain-water and serum samples,
Quantification was performed with aqueous standards in the-case of the
rain-water samples, and with matrix-matched standards in the case of the
serum samples. Recovery tests and a serum reference material were used
to check the accuracy of the proposed methods, Accurate results and good
agreement with the certified serum values were found in the presence of
platinum as a modifier, Chemical modifiers were not necessary for the
determination of Cr in rain water