9 research outputs found
Topological Dynamics indexed by words
Starting with a combinatorial partition theorem for words over an infinite
alphabet dominated by a fixed sequence, established recently by the authors, we
prove recurrence results for topological dynamical systems indexed by such
words. In this way we extend the classical theory developed by Furstenberg and
Weiss of dynamical systems indexed by the natural numbers to systems indexed by
words. Moreover, applying this theory to topological systems indexed by
semigroups that can be represented as words we get analogous recurrence results
for such systems.Comment: 20 page
On spreading -sequences in Banach spaces
We introduce and study the spreading-(s) and the spreading-(u) property of a Banach space and their relations. A space has the spreading-(s) property if every normalized weakly null sequence has a subsequence with a spreading model equivalent to the usual basis of ; while it has the spreading-(u) property if every weak Cauchy and non-weakly convergent sequence has a convex block subsequence with a spreading model equivalent to the summing basis of . The main results proved are the following:
(a) A Banach space X has the spreading-(s) property if and only if for every subspace Y of X and for every pair of sequences (x_n) in Y and in Y*, with(x_n) weakly null in Y and uniformly weakly null in Y* (in the sense of Mercourakis), we have (i.e. X has a hereditary weak Dunford-Pettis property).
(b) A Banach space X has the spreading-(u) property if and only if in the sense of the classification of Baire-1 elements of X** according to Haydon-Odell-Rosenthal.
(c) The spreading-(s) property implies the spreading-(u) property.
Result (c), proved via infinite combinations, connects an internal condition on a Banach space with an external one
TACI Mutations in Primary Antibody Deficiencies: A Nationwide Study in Greece
Background and objectives: Monoallelic (heterozygous) or biallelic
(homozygous or compound heterozygous) TACI mutations have been reported
as the most common genetic defects in patients with common variable
immunodeficiency (CVID), which is the most common clinically significant
primary immunodeficiency in humans. The aim of our study was to evaluate
the prevalence and any correlations of TACI defects in Greek patients
with primary antibody deficiencies. Materials and Methods: 117 patients
(male/female: 53/64) with CVID (110) and a combined IgA and IgG subclass
deficiency (7) with a CVID-like clinical phenotype were enrolled in the
study. Genomic DNA was extracted from peripheral blood and the molecular
analysis of the TACI gene was performed by PCR (Polymerase Chain
Reaction) and sequencing of all 5 exons, including exon-intron
boundaries. Results: Seventeen patients (14.5%) displayed TACI defects,
four (23.5%) carried combined heterozygous mutations and 13 (76.5%)
carried single heterozygous mutations. The most frequently detected
mutation was C104R (58.8%), followed by I87N (23.5%) and A181E
(11.8%), while R20C, C62Y, P151L, K188M and E236X mutations were
present in only one patient each. Patients with TACI defects were more
frequently male (p = 0.011) and displayed a benign lymphoproliferation
(splenomegaly and lymph node enlargement, p = 0.047 and p = 0.002,
respectively), had a history of tonsillectomy (p = 0.015) and
adenoidectomy (p = 0.031) and more frequently exhibited autoimmune
cytopenias (p = 0.046). Conclusions: Considering that accumulating
evidence suggests several CVID patients have a complex rather than a
monogenic inheritance, our data further support the notion that TACI
mutations, particularly as monoallelic defects, should be primarily
considered as susceptibility co-factors and/or modifiers of primary
antibody deficiencies
Factors Associated with Healthcare Workers’ (HCWs) Acceptance of COVID-19 Vaccinations and Indications of a Role Model towards Population Vaccinations from a Cross-Sectional Survey in Greece, May 2021
A Knowledge, Attitudes and Practices (KAP) study was conducted at the end of May 2021 engaging 1456 healthcare workers (HCWs) from 20 hospitals throughout Greece. Acceptance of vaccination against coronavirus disease 2019 (COVID-19) was estimated at 77.7%, with lower vaccine acceptance identified in nurses compared to physicians. Fears related to vaccine safety, lack of information and general knowledge about vaccinations, influenza vaccine acceptance, education level and years of practice were among the factors independently associated with vaccine acceptance. A strong association was identified between vaccination of HCWs in each health region and the population coverage, indicating that HCWs may be role models for the general population. Information campaigns should continue despite decisions taken regarding mandatory vaccinations
Factors Associated with Healthcare Workers' (HCWs) Acceptance of COVID-19 Vaccinations and Indications of a Role Model towards Population Vaccinations from a Cross-Sectional Survey in Greece, May 2021
A Knowledge, Attitudes and Practices (KAP) study was conducted at the
end of May 2021 engaging 1456 healthcare workers (HCWs) from 20
hospitals throughout Greece. Acceptance of vaccination against
coronavirus disease 2019 (COVID-19) was estimated at 77.7%, with lower
vaccine acceptance identified in nurses compared to physicians. Fears
related to vaccine safety, lack of information and general knowledge
about vaccinations, influenza vaccine acceptance, education level and
years of practice were among the factors independently associated with
vaccine acceptance. A strong association was identified between
vaccination of HCWs in each health region and the population coverage,
indicating that HCWs may be role models for the general population.
Information campaigns should continue despite decisions taken regarding
mandatory vaccinations.</p>