Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 62
Filtrar
1.
Eur J Investig Health Psychol Educ ; 14(4): 838-855, 2024 Mar 26.
Artigo em Inglês | MEDLINE | ID: mdl-38667809

RESUMO

The Russian-Ukrainian conflict is affecting mental health even in communities that are not directly involved in the war; added to this is the escalating conflict in the Middle East and its dangerous spread, which brings the war back to the center of the contemporary social and economic horizon. The present study aims to explore the psychological impact of war in a sample of 310 Italian young adults (18-30 years; M = 22.0; SD = 2.6) while exploring the relationship between Fear of War and psychological distress and evaluating the mediating effects of Future Anxiety and Intolerance of Uncertainty in this relation. Findings highlighted how Fear of War positively and significantly affects Stress, Anxiety, and Depression, and, at the same time, how it fuels both Future Anxiety and Intolerance of Uncertainty. These constructs, in addition to positively affecting the mental health outcomes considered, mediate the relationship between Fear of War and youth psychological distress with a significant indirect effect observed in all three mediation models performed. Finally, significantly higher levels of psychological distress, Fear of War, and Future Anxiety are reported in women than in men. The findings are discussed with reference to the recent literature on the psychological impact of war and on contemporary youth psychological distress, indicating the importance of educational policies and targeted interventions aimed at supporting this target in coping with multiple contemporary collective stressors.

2.
Front Cell Neurosci ; 17: 1211446, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37545879

RESUMO

Background: Toxoplasmosis affects one third of the world population and has the protozoan Toxoplasma gondii as etiological agent. Congenital toxoplasmosis (CT) can cause severe damage to the fetus, including miscarriages, intracranial calcification, hydrocephalus and retinochoroiditis. Severity of CT depends on the gestational period in which infection occurs, and alterations at the cellular level during retinal development have been reported. In this study, we proposed a mouse CT model to investigate the impact of infection on retinal development. Methods: Pregnant females of pigmented C57BL/6 strain mice were infected intragastrically with two T. gondii cysts (ME49 strain) at embryonic day 10 (E10), and the offspring were analyzed at E18. Results: Infected embryos had significantly smaller body sizes and weights than the PBS-treated controls, indicating that embryonic development was affected. In the retina, a significant increase in the number of Ki-67-positive cells (marker of proliferating cells) was found in the apical region of the NBL of infected mice compared to the control. Supporting this, cell cycle proteins Cyclin D3, Cdk6 and pChK2 were significantly altered in infected retinas. Interestingly, the immunohistochemical analysis showed a significant increase in the population of ß-III-tubulin-positive cells, one of the earliest markers of neuronal differentiation. Conclusions: Our data suggests that CT affects cell cycle progression in retinal progenitor cells, possibly inducing the arrest of these cells at G2/M phase. Such alterations could influence the differentiation, anticipating/increasing neuronal maturation, and therefore leading to abnormal retinal formation. Our model mimics important events observed in ocular CT.

4.
Prev Vet Med ; 218: 105992, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37598460

RESUMO

From 2001, due to the launching of the National Program for the Control and Eradication of Brucellosis and Tuberculosis, Brazil began a series of studies aimed at the epidemiological characterization of bovine brucellosis in its federative units. In the state of Mato Grosso, studies conducted in 2003 and 2014 showed a reduction in the prevalence of infected herds from 41.2 % to 24 % and in the prevalence of seropositive animals from 10.2 % to 5.1 %. These results stemmed from the efficient heifer vaccination program with S19 implemented by the state. From this scenario, the present study quantified and compared the benefits and costs of bovine brucellosis control in the state through a financial analysis. When considering private and public costs, the Net Present Value (NPV) was estimated at US$ 37.5 million, the Internal Rate of Return (IRR) was calculated at 31 %, and the Benefit-Cost Ratio (BCR) was 2.3. When considering only the private costs, the NPV was US$ 51.3 million, the IRR was 46 % and the BCR was 3.43, indicating that the cattle producer in Mato Grosso had a return of US$ 3.43 for each US$ 1.00 invested. Therefore, the bovine brucellosis control actions carried out in the state of Mato Grosso between 2003 and 2014 were highly advantageous from the economic point of view. The most rational way to continue decreasing bovine brucellosis prevalences at low cost in the state is to maintain the heifer vaccination program, using the RB51 vaccine in addition to S19.


Assuntos
Brucelose Bovina , Brucelose , Doenças dos Bovinos , Animais , Bovinos , Feminino , Análise Custo-Benefício , Brasil/epidemiologia , Brucelose Bovina/epidemiologia , Brucelose Bovina/prevenção & controle , Estudos Retrospectivos , Brucelose/veterinária
5.
Nanoscale ; 15(15): 7154-7163, 2023 Apr 13.
Artigo em Inglês | MEDLINE | ID: mdl-37009757

RESUMO

The transition metal dichalcogenide family of semiconducting two-dimensional materials has recently shown a prominent potential to be an ideal platform to study the exciton Mott transition into electron-hole plasma and liquid phases due to their strong Coulomb interactions. Here, we show that pulsed laser excitation at high pump fluences can induce this exciton Mott transition to an electron-hole plasma in mono and few-layer transition metal dichalcogenides at room temperature. The formation of an electron-hole plasma leads to a broadband light emission spanning from the near infrared to the visible region. In agreement with our theoretical calculations, the photoluminescence emission at high energies displays an exponential decay that directly reflects the electronic temperature - a characteristic fingerprint of unbound electron-hole pair recombination. Furthermore, two-pulse excitation correlation measurements were performed to study the dynamics of electronic cooling, which shows two decay time components, one of less than 100 fs and a slower component of few ps associated with the electron-phonon and phonon-lattice bath thermalizations, respectively. Our work may shed light on further studies of the exciton Mott transition into other two-dimensional materials and their heterostructures and its applications in nanolasers and other optoelectronic devices.

6.
ACS Nano ; 17(8): 7326-7334, 2023 Apr 25.
Artigo em Inglês | MEDLINE | ID: mdl-37058341

RESUMO

Janus transition-metal dichalcogenide monolayers are artificial materials, where one plane of chalcogen atoms is replaced by chalcogen atoms of a different type. Theory predicts an in-built out-of-plane electric field, giving rise to long-lived, dipolar excitons, while preserving direct-bandgap optical transitions in a uniform potential landscape. Previous Janus studies had broad photoluminescence (>18 meV) spectra obfuscating their specific excitonic origin. Here, we identify the neutral and the negatively charged inter- and intravalley exciton transitions in Janus WSeS monolayers with ∼6 meV optical line widths. We integrate Janus monolayers into vertical heterostructures, allowing doping control. Magneto-optic measurements indicate that monolayer WSeS has a direct bandgap at the K points. Our results pave the way for applications such as nanoscale sensing, which relies on resolving excitonic energy shifts, and the development of Janus-based optoelectronic devices, which requires charge-state control and integration into vertical heterostructures.

7.
Viruses ; 15(3)2023 03 14.
Artigo em Inglês | MEDLINE | ID: mdl-36992454

RESUMO

Neurological effects of COVID-19 and long-COVID-19, as well as neuroinvasion by SARS-CoV-2, still pose several questions and are of both clinical and scientific relevance. We described the cellular and molecular effects of the human brain microvascular endothelial cells (HBMECs) in vitro exposure by SARS-CoV-2 to understand the underlying mechanisms of viral transmigration through the blood-brain barrier. Despite the low to non-productive viral replication, SARS-CoV-2-exposed cultures displayed increased immunoreactivity for cleaved caspase-3, an indicator of apoptotic cell death, tight junction protein expression, and immunolocalization. Transcriptomic profiling of SARS-CoV-2-challenged cultures revealed endothelial activation via NF-κB non-canonical pathway, including RELB overexpression and mitochondrial dysfunction. Additionally, SARS-CoV-2 led to altered secretion of key angiogenic factors and to significant changes in mitochondrial dynamics, with increased mitofusin-2 expression and increased mitochondrial networks. Endothelial activation and remodeling can further contribute to neuroinflammatory processes and lead to further BBB permeability in COVID-19.


Assuntos
COVID-19 , NF-kappa B , Humanos , NF-kappa B/metabolismo , SARS-CoV-2/metabolismo , Células Endoteliais/metabolismo , Síndrome de COVID-19 Pós-Aguda , COVID-19/metabolismo , Encéfalo , Barreira Hematoencefálica , Mitocôndrias/metabolismo
8.
Audiol., Commun. res ; 28: e2804, 2023. tab, graf
Artigo em Português | LILACS | ID: biblio-1527918

RESUMO

RESUMO Objetivo Verificar os benefícios da protetização auditiva na qualidade de vida do adulto com deficiência auditiva. Estratégia de pesquisa Revisão de escopo, guiada pelas recomendações PRISMA. Critérios de seleção A busca foi realizada com o auxílio dos unitermos "auxiliares de audição", "aparelho auditivo", "implante coclear", "fonoaudiologia", "deficiência auditiva", "perda auditiva", "qualidade de vida", e seus respectivos em inglês e espanhol, nos bancos virtuais de dados: LILACS, SciELO, PubMed, Scopus, Web of Science e OpenGrey. Os dados foram analisados qualitativamente. Resultados Foram identificados 1.312 registros e selecionados 6 artigos, com população protetizada auditivamente, dos 18 aos 92 anos, de ambos os gêneros, usuários de implante coclear e aparelho de amplificação sonora individual. Foram utilizados os seguintes instrumentos: Questionário de avaliação das expectativas do adulto/idoso novo usuário de próteses auditivas, International Outcome Inventory For Hearing Aids, Questionário Nijmegen de Implantes Cocleares, Questionário de Satisfação do Cliente, Caregiver Strain Questionnaire, Formulário de Questionário Relativo ao Índice, World Health Organization Quality of Life-bref, Glasgow Health Status Inventory, Abbreviated Profile of Hearing Aid Benefit, Cochlear Implant Quality of Life, Caregiver Burden Scale, Escala Quantificada de Denver e Escala Visual Analógica. Os resultados indicaram melhor qualidade de vida nos domínios testados, tanto na visão dos adultos surdos quanto na de seus parceiros. Conclusão Apesar da heterogeneidade dos protocolos de qualidade de vida utilizados nos estudos selecionados, foi possível verificar que a protetização auditiva melhora a qualidade de vida do adulto com deficiência auditiva.


ABSTRACT Purpose To verify the benefits of hearing aids in the quality of life of adults with hearing loss. Research strategy Scoping review guided by PRISMA recommendations. Selection criteria with the help of the keywords "hearing aids", "hearing aid", "cochlear implant", "speech therapy", "hearing impairment", "hearing loss", "quality of life", and their respective in English and Spanish in the virtual databases: LILACS, SciELO, PubMed, SCOPUS, Web of Science and Open Grey. Qualitatively analyzed. Results 1,312 records were identified and six articles were selected, with a hearing aided population from 18 to 92 years old, from both genders, cochlear implant and individual sound amplification device users. Questionnaires were used (assessment of expectations of adults/elderly users of hearing aids, International Outcome Inventory For Hearing Aids, Nijmegen Cochlear Implant, Satisfaction, Caregiver Strain Questionnaire, Relative to the Index, World Health Organization Quality of Life-bref, Glasgow Health Status Inventory, Abbreviated Profile of Hearing Aid Benefit, Cochlear Implant Quality of Life and scales (Care Giving Burden Scale), Denver Quantified and visual analog). The results indicated a better quality of life in the domains tested, both in the view of deaf adults and their partners. Conclusion Despite the heterogeneity of the quality of life protocols used in the selected studies, it was possible to verify that hearing aids increase the quality of life of adults with hearing loss.


Assuntos
Humanos , Qualidade de Vida , Implantes Cocleares , Perfil de Impacto da Doença , Auxiliares de Audição , Perda Auditiva/reabilitação
9.
Rev. bioét. (Impr.) ; 31: e3274PT, 2023. tab
Artigo em Inglês, Espanhol, Português | LILACS | ID: biblio-1521656

RESUMO

Resumo As tecnologias da informação e comunicação têm influência cada vez maior na área da saúde, sendo o aumento significativo do recurso à teleconsulta um reflexo disso. Os benefícios que essa modalidade de prestação de serviços de saúde ocasiona são inquestionáveis, a começar pelo facto de auxiliarem a enfrentar os desafios contemporâneos que assolam os sistemas de saúde em todo o mundo. Todavia, a sua crescente utilização vem sublinhar a importância de salvaguardar questões éticas relacionadas com a autonomia, equidade, privacidade e qualidade da relação entre o utente e o profissional de saúde. Este artigo pretende estimular uma reflexão acerca dos desafios éticos que se colocam antes, durante e após o uso da teleconsulta, com o intuito de otimizar e modelar a sua utilização.


Abstract Information and communication Technologies are increasingly present in health care, as exemplified by the recourse to remote consultation. Such care delivery modality brings unquestionable benefits, such as helping to face the contemporary challenges plaguing health systems worldwide. But its ever-increasing use underlines the importance of safeguarding ethical issues related to autonomy, equity, privacy, and the quality of the user-professional relations. This paper reflects on the ethical challenges presented before, during, and after remote consultation as to optimize and shape its use.


Resumen Las tecnologías de la información y la comunicación tienen una influencia cada vez mayor en el área de la salud, y esto lleva a un aumento significativo en el uso de la teleconsulta. Muchos son los beneficios de esta modalidad de prestación de servicios sanitarios, comenzando por el hecho de que ayudan a abordar los desafíos contemporáneos que afectan a los sistemas de salud en todo el mundo. Sin embargo, su uso creciente destaca la importancia de salvaguardar las cuestiones éticas relacionadas con la autonomía, la equidad, la privacidad y la calidad de la relación entre el paciente y el profesional de la salud. Este artículo pretende incitar a una reflexión sobre los desafíos éticos que surgen antes, durante y después del uso de la teleconsulta, con el fin de optimizarlo y modelarlo.


Assuntos
Ética Médica
10.
Acta Med Port ; 35(12): 917-923, 2022 Dec 02.
Artigo em Inglês | MEDLINE | ID: mdl-36469943

RESUMO

Medical decision-making is a complex task in any field. In the medico-legal examination of victims that have (allegedly) been sexually assaulted there are many specific variables and features influencing the decision. It is essential to complement the clinical intervention with a forensic approach. Clinical parameters such as the victim's physical and cognitive state along with circumstantial information such as the elapsed time from the event and the type of abuse (described or suspected) grant different levels of priority to the forensic medical assessment. In such cases, forensic medical doctors or other medical doctors responsible for attending to the victim may have to decide whether to perform the examination prior to a judicial analysis of the case if consent cannot be obtained. This implies the need to deliberate about performing the examination and/or reporting the case to legal authorities. This article discusses the forensic medical decision-making process in cases of alleged recent sexual assault of victims who are legally unable to consent or unable to consent for other reasons. We aimed to identify possible ethical problems that can arise in this context and discuss which elements should be considered by medical doctors when making decisions about such cases. The Portuguese legal framework of medico-legal examinations is analyzed. The authors also make considerations about reporting these cases from a legal point of view. The discussion turns to an ethical perspective where possible ethical problems arising from medical deliberation are identified. Issues about legally incompetent victims and incompetent victims due to other reasons are addressed. A decision-making tree, based on the problems identified, is proposed.


Assuntos
Vítimas de Crime , Delitos Sexuais , Humanos , Portugal , Medicina Legal , Exame Físico , Consentimento Livre e Esclarecido
11.
J Mol Med (Berl) ; 100(10): 1405-1425, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36056255

RESUMO

Cellular prion protein (PrPC) is a highly conserved glycoprotein, present both anchored in the cell membrane and soluble in the extracellular medium. It has a diversity of ligands and is variably expressed in numerous tissues and cell subtypes, most notably in the central nervous system (CNS). Its importance has been brought to light over the years both under physiological conditions, such as embryogenesis and immune system homeostasis, and in pathologies, such as cancer and neurodegenerative diseases. During development, PrPC plays an important role in CNS, participating in axonal growth and guidance and differentiation of glial cells, but also in other organs such as the heart, lung, and digestive system. In diseases, PrPC has been related to several types of tumors, modulating cancer stem cells, enhancing malignant properties, and inducing drug resistance. Also, in non-neoplastic diseases, such as Alzheimer's and Parkinson's diseases, PrPC seems to alter the dynamics of neurotoxic aggregate formation and, consequently, the progression of the disease. In this review, we explore in detail the multiple functions of this protein, which proved to be relevant for understanding the dynamics of organism homeostasis, as well as a promising target in the treatment of both neoplastic and degenerative diseases.


Assuntos
Neoplasias , Doenças Neurodegenerativas , Proteínas PrPC , Sistema Nervoso Central/metabolismo , Humanos , Células-Tronco Neoplásicas/metabolismo , Proteínas PrPC/genética , Proteínas PrPC/metabolismo
12.
Artigo em Inglês | MEDLINE | ID: mdl-35886422

RESUMO

The aim of this work was to adapt and validate the Sibling Attachment Inventory (SAI) in Mexican young adults and analyze its psychometric properties. Using an Internet-based survey, data were collected from 307 (64.5% female) Mexican young adults university students (aged 18-30). Exploratory and confirmatory factor analyses were performed to determine the factor structure of the revised Mexican version of the Sibling Attachment Inventory (SAI-RMx). Convergent and predictive validity were verified by carrying out correlations with the parent form of the Inventory of Parent and Peer Attachment (IPPA), the Lifespan Sibling Relationship Scale (LSRS), the Satisfaction With Life Scale (SWLS), and the Rosenberg Self-Esteem Scale (RSE). Results indicated that the SAI-RMx presents good levels of internal consistency and a monodimensional structure, also providing evidence for convergent, predictive, and construct validity. Furthermore, secure attachments were linked with high levels of self-esteem, as well as with high levels of life satisfaction. The SAI-RMx is expected to be a reliable instrument for measuring the global level and the three components of secure attachment between siblings in the young adult's Mexican population.


Assuntos
Autoimagem , Irmãos , Análise Fatorial , Feminino , Humanos , Masculino , Psicometria/métodos , Reprodutibilidade dos Testes , Inquéritos e Questionários , Adulto Jovem
13.
BMC Med Ethics ; 23(1): 77, 2022 07 25.
Artigo em Inglês | MEDLINE | ID: mdl-35879800

RESUMO

BACKGROUND: Compulsory treatments represent a legal means of imposing treatment on an individual, usually with a mental illness, who refuses therapeutic intervention and poses a risk of self-harm or harm to others. Compulsory outpatient treatment (COT) in psychiatry, also known as community treatment order, is a modality of involuntary treatment that broadens the therapeutic imposition beyond hospitalization and into the community. Despite its existence in over 75 jurisdictions worldwide, COT is currently one of the most controversial topics in psychiatry, and it presents significant ethical challenges. Nonetheless, the ethical debate regarding compulsory treatment almost always stops at a preclinical level, with the different ethical positions arguing for or against its use, and there is little guidance to support for the individual clinicians to act ethically when making the decision to implement COT. MAIN BODY: The current body of evidence is not clear about the efficacy of COT. Therefore, despite its application in several countries, evidence favouring the use of COT is controversial and mixed at best. In these unclear circumstances, ethical guidance becomes paramount. This paper provides an ethical analysis of use of COT, considering the principlist framework established by Ross Upshur in 2002 to justify public health interventions during the 2002-2004 severe acute respiratory syndrome outbreak. This paper thoroughly examines the pertinence of using the principles of harm, proportionality, reciprocity, and transparency when considering the initiation of COT. CONCLUSION: Ross Upshur's principlist model provides a useful reflection tool for justifying the application of COT. This framework may help to inform sounder ethical decisions in clinical psychiatric practice.


Assuntos
Tratamento Involuntário , Transtornos Mentais , Psiquiatria , Humanos , Transtornos Mentais/terapia , Pacientes Ambulatoriais , Saúde Pública
14.
bioRxiv ; 2022 Jun 16.
Artigo em Inglês | MEDLINE | ID: mdl-35734080

RESUMO

Neurological effects of COVID-19 and long-COVID-19 as well as neuroinvasion by SARS-CoV-2 still pose several questions and are of both clinical and scientific relevance. We described the cellular and molecular effects of the human brain microvascular endothelial cells (HBMECs) in vitro infection by SARS-CoV-2 to understand the underlying mechanisms of viral transmigration through the Blood-Brain Barrier. Despite the low to non-productive viral replication, SARS-CoV-2-infected cultures displayed increased apoptotic cell death and tight junction protein expression and immunolocalization. Transcriptomic profiling of infected cultures revealed endothelial activation via NF-κB non-canonical pathway, including RELB overexpression, and mitochondrial dysfunction. Additionally, SARS-CoV-2 led to altered secretion of key angiogenic factors and to significant changes in mitochondrial dynamics, with increased mitofusin-2 expression and increased mitochondrial networks. Endothelial activation and remodeling can further contribute to neuroinflammatory processes and lead to further BBB permeability in COVID-19.

15.
Res Sq ; 2022 Jun 16.
Artigo em Inglês | MEDLINE | ID: mdl-35734086

RESUMO

Neurological effects of COVID-19 and long-COVID-19 as well as neuroinvasion by SARS-CoV-2 still pose several questions and are of both clinical and scientific relevance. We described the cellular and molecular effects of the human brain microvascular endothelial cells (HBMECs) in vitro infection by SARS-CoV-2 to understand the underlying mechanisms of viral transmigration through the Blood-Brain Barrier. Despite the low to non- productive viral replication, SARS-CoV-2-infected cultures displayed increased apoptotic cell death and tight junction protein expression and immunolocalization. Transcriptomic profiling of infected cultures revealed endothelial activation via NF-κB non-canonical pathway, including RELB overexpression, and mitochondrial dysfunction. Additionally, SARS-CoV-2 led to altered secretion of key angiogenic factors and to significant changes in mitochondrial dynamics, with increased mitofusin-2 expression and increased mitochondrial networks. Endothelial activation and remodeling can further contribute to neuroinflammatory processes and lead to further BBB permeability in COVID-19.

16.
Acta Biomed ; 93(2): e2022136, 2022 05 11.
Artigo em Inglês | MEDLINE | ID: mdl-35546001

RESUMO

letter to editor.


Assuntos
Sobretratamento , Idoso , Humanos
17.
Audiol Res ; 12(2): 171-181, 2022 Mar 26.
Artigo em Inglês | MEDLINE | ID: mdl-35447740

RESUMO

Ethical standards in audiology have been continuously improved and discussed, leading to the elaboration of specific regulatory guidelines for the profession. However, in the field of auditory rehabilitation, audiologists are still faced with circumstances that question their ethical principles, usually associated with the support of the hearing aids industry. The study explores the decision-making process and ethical concerns in auditory rehabilitation as they relate to the practice of audiology in Portugal. An online questionnaire constructed by the authors was used and sent to the email addresses of a list of audiologists, registered with the Portuguese Association of Audiologists. The questionnaire was answered by 93 audiologists with clinical experience in auditory rehabilitation for more than one year. The collected data demonstrated that audiometric results and clinical experience are the most important factors for decision-making in auditory rehabilitation practice. Moreover, incentives from the employers or manufacturers were identified as the main cause of ethical dilemmas. This study highlights the ethical concerns regarding the clinical practice of auditory rehabilitation in Portugal, revealing that the decision-making process is complex and, specifically in this field, the current practice may not be adequate for effective compliance with professional ethical standards.

18.
ACS Nano ; 16(5): 7589-7604, 2022 May 24.
Artigo em Inglês | MEDLINE | ID: mdl-35486712

RESUMO

When a twist angle is applied between two layered materials (LMs), the registry of the layers and the associated change in their functional properties are spatially modulated, and a moiré superlattice arises. Several works explored the optical, electric, and electromechanical moiré-dependent properties of such twisted LMs but, to the best of our knowledge, no direct visualization and quantification of van der Waals (vdW) interlayer interactions has been presented, so far. Here, we use tapping mode atomic force microscopy phase-imaging to probe the spatial modulation of the vdW potential in twisted hexagonal boron nitride. We find a moiré superlattice in the phase channel only when noncontact (long-range) forces are probed, revealing the modulation of the vdW potential at the sample surface, following AB and BA stacking domains. The creation of scalable electrostatic domains, modulating the vdW potential at the interface with the environment by means of layer twisting, could be used for local adhesion engineering and surface functionalization by affecting the deposition of molecules or nanoparticles.

19.
Am J Dermatopathol ; 44(5): 368-371, 2022 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-35220325

RESUMO

ABSTRACT: The human T-cell lymphotropic virus type 1 is a retrovirus that may cause severe diseases such as infective dermatitis associated with HTLV-1 (IDH) and adult T-cell leukemia/lymphoma (ATL). IDH is a chronic relapsing infected eczema of childhood, and ATL is a distinct type of peripheral T-cell leukemia/lymphoma, which is classified into the following types: smoldering, primary cutaneous tumoral, chronic, lymphoma, and acute. Progression of IDH to ATL during the course of IDH has been previously reported in 3 young patients, two of them from Bahia (Brazil). We present the case of a 22-year-old man who had IDH since childhood and developed ATL 18 months ago. The lymphoma lesions were superimposed on previously existing IDH lesions (forehead, axillae, umbilical area, and neck) or in areas generally affected by IDH (external genitalia, hypogastrium, groin, and eyelid). Cutaneous lesions in ATL are very frequent, but in this patient, besides infiltrated plaques and papules presented vesicles on the skin corresponding histologically to dilated Pautrier abscesses. Vesicular ATL is a rare condition. This case constitutes a very demonstrative example of the close correlation between IDH and ATL.


Assuntos
Eczema , Infecções por HTLV-I , Vírus Linfotrópico T Tipo 1 Humano , Leucemia-Linfoma de Células T do Adulto , Linfoma , Dermatopatias Infecciosas , Adulto , Infecções por HTLV-I/complicações , Humanos , Leucemia-Linfoma de Células T do Adulto/complicações , Masculino , Dermatopatias Infecciosas/complicações , Adulto Jovem
20.
ACS Nano ; 15(9): 15371-15380, 2021 Sep 28.
Artigo em Inglês | MEDLINE | ID: mdl-34450007

RESUMO

The Stark effect is one of the most efficient mechanisms to manipulate many-body states in nanostructured systems. In mono- and few-layer transition metal dichalcogenides, it has been successfully induced by optical and electric field means. Here, we tune the optical emission energies and dissociate excitonic states in MoSe2 monolayers employing the 220 MHz in-plane piezoelectric field carried by surface acoustic waves. We transfer the monolayers to high dielectric constant piezoelectric substrates, where the neutral exciton binding energy is reduced, allowing us to efficiently quench (above 90%) and red-shift the excitonic optical emissions. A model for the acoustically induced Stark effect yields neutral exciton and trion in-plane polarizabilities of 530 and 630 × 10-5 meV/(kV/cm)2, respectively, which are considerably larger than those reported for monolayers encapsulated in hexagonal boron nitride. Large in-plane polarizabilities are an attractive ingredient to manipulate and modulate multiexciton interactions in two-dimensional semiconductor nanostructures for optoelectronic applications.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...