77 research outputs found
On the isometric composition operators on the Bloch space in C^n
Let phi be a holomorphic self-map of a bounded homogeneous domain D in C^n.
In this work, we show that the composition operator C_phi is bounded on the
Bloch space B of the domain and provide estimates on its operator norm. We also
give a sufficient condition for phi to induce an isometry on B. This condition
allows us to construct non-trivial examples of isometric composition operators
in the case when D has the unit disk as a factor. We then obtain some necessary
conditions for C_phi to be an isometry on B when D is a Cartan classical
domain. Finally, we give the complete description of the spectrum of the
isometric composition operators in the case of the unit disk and for a wide
class of symbols on the polydisk
Isometries and spectra of multiplication operators on the Bloch space
In this paper, we establish bounds on the norm of multiplication operators on
the Bloch space of the unit disk via weighted composition operators. In doing
so, we characterize the isometric multiplication operators to be precisely
those induced by constant functions of modulus 1. We then describe the spectrum
of the multiplication operators in terms of the range of the symbol. Lastly, we
identify the isometries and spectra of a particular class of weighted
composition operators on the Bloch space.Comment: accepted to the Bulletin of the Australian Mathematical Societ
Multiplication operators on the Bloch space of bounded homogeneous domains
In this paper, we study the multiplication operators on the Bloch space of a
bounded homogeneous domain in C^n. Specifically, we characterize the bounded
and the compact multiplication operators, establish estimates on the operator
norm, and determine the spectrum. Furthermore, we prove that for a large class
of bounded symmetric domains, the isometric multiplication operators are those
whose symbol is a constant of modulus one
Weighted composition operators from to the Bloch space of a bounded homogeneous domain
Let be a bounded homogeneous domain in . In this paper, we
study the bounded and the compact weighted composition operators mapping the
Hardy space into the Bloch space of . We characterize the
bounded weighted composition operators, provide operator norm estimates, and
give sufficient conditions for compactness. We prove that these conditions are
necessary in the case of the unit ball and the polydisk. We then show that if
is a bounded symmetric domain, the bounded multiplication operators from
to the Bloch space of are the operators whose symbol is
bounded
Regenerative Approaches in Wound Healing: New Alternatives for Older Tools
Critical wounds are well known to develop in elderly people and in other conditions where inflammation, vascular, and nervous disease lead to chronical inefficiency in running up healing processes. Recent researches have been focusing on microenvironment, and specific technologies have contributed to design and produce new materials (the era of biomaterials and devices in wound healing)
Multiplication Operators between Lipschitz-Type Spaces on a Tree
Let â be the space of complex-valued functions on the set of vertices of an infinite tree rooted at such that the difference of the values of at neighboring vertices remains bounded throughout the tree, and let â be the set of functions ââ such that |()â(â)|=(||â1), where || is the distance between and and â is the neighbor of closest to . In this paper, we characterize the bounded and the compact multiplication operators between â and â and provide operator norm and essential norm estimates. Furthermore, we characterize the bounded and compact multiplication operators between â and the space â of bounded functions on and determine their operator norm and their essential norm. We establish that there are no isometries among the multiplication operators between these spaces
Targeting a Newly Established Spontaneous Feline Fibrosarcoma Cell Line by Gene Transfer
Fibrosarcoma is a deadly disease in cats and is significantly more often located at classical vaccine injections sites. More rare forms of spontaneous non-vaccination site (NSV) fibrosarcomas have been described and have been found associated to genetic alterations. Purpose of this study was to compare the efficacy of adenoviral gene transfer in NVS fibrosarcoma. We isolated and characterized a NVS fibrosarcoma cell line (Cocca-6A) from a spontaneous fibrosarcoma that occurred in a domestic calico cat. The feline cells were karyotyped and their chromosome number was counted using a Giemsa staining. Adenoviral gene transfer was verified by western blot analysis. Flow cytometry assay and Annexin-V were used to study cell-cycle changes and cell death of transduced cells. Cocca-6A fibrosarcoma cells were morphologically and cytogenetically characterized. Giemsa block staining of metaphase spreads of the Cocca-6A cells showed deletion of one of the E1 chromosomes, where feline p53 maps. Semi-quantitative PCR demonstrated reduction of p53 genomic DNA in the Cocca-6A cells. Adenoviral gene transfer determined a remarkable effect on the viability and growth of the Cocca-6A cells following single transduction with adenoviruses carrying Mda-7/IL-24 or IFN-Îł or various combination of RB/p105, Ras-DN, IFN-Îł, and Mda-7 gene transfer. Therapy for feline fibrosarcomas is often insufficient for long lasting tumor eradication. More gene transfer studies should be conducted in order to understand if these viral vectors could be applicable regardless the origin (spontaneous vs. vaccine induced) of feline fibrosarcomas
Demographic, clinical, and service-use characteristics related to the clinicianâs recommendation to transition from child to adult mental health services
Purpose:
The service configuration with distinct child and adolescent mental health services (CAMHS) and adult mental health services (AMHS) may be a barrier to continuity of care. Because of a lack of transition policy, CAMHS clinicians have to decide whether and when a young person should transition to AMHS. This study describes which characteristics are associated with the cliniciansâ advice to continue treatment at AMHS.
Methods:
Demographic, family, clinical, treatment, and service-use characteristics of the MILESTONE cohort of 763 young people from 39 CAMHS in Europe were assessed using multi-informant and standardized assessment tools. Logistic mixed models were fitted to assess the relationship between these characteristics and cliniciansâ transition recommendations.
Results:
Young people with higher clinician-rated severity of psychopathology scores, with self- and parent-reported need for ongoing treatment, with lower everyday functional skills and without self-reported psychotic experiences were more likely to be recommended to continue treatment. Among those who had been recommended to continue treatment, young people who used psychotropic medication, who had been in CAMHS for more than a year, and for whom appropriate AMHS were available were more likely to be recommended to continue treatment at AMHS. Young people whose parents indicated a need for ongoing treatment were more likely to be recommended to stay in CAMHS.
Conclusion:
Although the decision regarding continuity of treatment was mostly determined by a small set of clinical characteristics, the recommendation to continue treatment at AMHS was mostly affected by service-use related characteristics, such as the availability of appropriate services
Cohort profile : demographic and clinical characteristics of the MILESTONE longitudinal cohort of young people approaching the upper age limit of their child mental health care service in Europe
Purpose: The presence of distinct child and adolescent mental health services (CAMHS) and adult mental health services (AMHS) impacts continuity of mental health treatment for young people. However, we do not know the extent of discontinuity of care in Europe nor the effects of discontinuity on the mental health of young people. Current research is limited, as the majority of existing studies are retrospective, based on small samples or used non-standardised information from medical records. The MILESTONE prospective cohort study aims to examine associations between service use, mental health and other outcomes over 24 months, using information from self, parent and clinician reports. Participants: Seven hundred sixty-three young people from 39 CAMHS in 8 European countries, their parents and CAMHS clinicians who completed interviews and online questionnaires and were followed up for 2 years after reaching the upper age limit of the CAMHS they receive treatment at. Findings to date: This cohort profile describes the baseline characteristics of the MILESTONE cohort. The mental health of young people reaching the upper age limit of their CAMHS varied greatly in type and severity: 32.8% of young people reported clinical levels of self-reported problems and 18.6% were rated to be âmarkedly illâ, âseverely illâ or âamong the most extremely illâ by their clinician. Fifty-seven per cent of young people reported psychotropic medication use in the previous half year. Future plans: Analysis of longitudinal data from the MILESTONE cohort will be used to assess relationships between the demographic and clinical characteristics of young people reaching the upper age limit of their CAMHS and the type of care the young person uses over the next 2 years, such as whether the young person transitions to AMHS. At 2 years follow-up, the mental health outcomes of young people following different care pathways will be compared. Trial registration number: NCT03013595
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