Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 122
Filtrar
Mais filtros

Base de dados
Tipo de documento
Intervalo de ano de publicação
1.
Health Educ Res ; 2024 Mar 25.
Artigo em Inglês | MEDLINE | ID: mdl-38527293

RESUMO

Schools and school teachers often focus on content aimed at delaying sexual debut and preventing teenage pregnancy, and address the impacts of risky behaviours on infant health. Infant simulators are increasingly used in health education courses. However, it is unclear how effective this education is. In this review, we examined the evidence for the effectiveness and use of pregnancy/parenting education programmes for school-aged students using infant simulators. Infant simulators are lifelike replicas of human newborn babies that have electronic capacity to mimic a range of infant behaviours. These may include feeding, comfort needs and nappy changing. Responses to these replicated behaviours may be recorded to provide feedback of the adequacy of the response for educational purposes and provide feedback to prospective parents and caregivers. This review followed the guidelines for conducting a scoping review developed by Joanna Briggs Institute (JBI). After following the process as recommended by the JBI, 32 eligible articles were selected for inclusion. Eight themes emerged from the analysis and it was found that the use of infant simulators in terms of effectiveness was not conclusive. This may be due to lack of longitudinal studies examining the impact of the education provided. Furthermore, the literature did not address innovations of infant simulators that replicate infants with particular characteristics, those with fetal alcohol spectrum disorder, shaken baby syndrome or challenges from parental substance use. Further research is required to determine the long-term impact of using infant simulators on reducing risky behaviours. Given these challenges, it is important to support initiatives for sex, pregnancy and parenting education among all students.

2.
BMC Public Health ; 22(1): 2323, 2022 12 12.
Artigo em Inglês | MEDLINE | ID: mdl-36510183

RESUMO

PURPOSE: With emerging evidence indicating that systems-based approaches help optimise suicide prevention efforts, the National Suicide Prevention Trial sought to gather evidence on the appropriateness of these approaches to prevent suicide among at-risk populations, in regional and rural communities throughout Australia. The Tasmanian component of the Trial implemented the LifeSpan systems framework across three distinct rural areas with priority populations of men aged 40-64 and people 65 and over. The University of Tasmania's Centre for Rural Health undertook a local-level evaluation of the Trial. AIMS: To explore key stakeholder perceptions of implementing a systems-based suicide prevention program in regional and rural communities in Tasmania, Australia. METHOD: This study utilised qualitative methods to explore in depth, stakeholder perspectives. Focus groups and interviews were conducted with 46 participants, comprising Trial Site Working Group members (n = 25), Tasmania's Primary Health Network employees (n = 7), and other key stakeholders (n = 14). Approximately half of participants had a lived experience of suicide. Data were thematically analysed using NVivo. RESULTS: Key themes centred on factors impacting implementation of the Trial. These included how the Trial was established in Tasmania; Working Group governance structures and processes; communication and engagement processes; reaching priority population groups; the LifeSpan model and activity development; and the effectiveness, reach and sustainability of activities. DISCUSSION: Communities were acutely aware of the need to address suicide in their communities, with the Trial providing resources and coordination needed for community engagement and action. Strict adherence to the Lifespan model was challenging at the community level, with planning and time needed to focus on strategies influencing whole or multiple systems, for example health system changes, means restriction. Perceived limitations around implementation concerned varied community buy-in and stakeholder engagement and involvement, with lack of role clarity cited as a barrier to implementation within Working Groups. Barriers delivering activities to priority population groups centred around socio-cultural and technological factors, literacy, and levels of public awareness. Working Groups preferred activities which build on available capital and resources and which meet the perceived needs within the whole community. Approaches sought to increase awareness of suicide and its prevention, relationships and partnerships, and the lived experience capacity in Working Groups and communities. CONCLUSION: Stakeholder insights of implementing the National Suicide Prevention Trial in regional and rural Tasmanian from this study can help guide future community-based suicide prevention efforts, in similar geographic areas and with high-risk groups.


Assuntos
Serviços de Saúde Rural , Masculino , Humanos , Prevenção do Suicídio , População Rural , Saúde da População Rural , Pessoal de Saúde
3.
Genome ; 63(4): 195-202, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32142382

RESUMO

Malaza fastuosus is a lavishly patterned skipper butterfly from a genus that has three described species, all endemic to the mainland of Madagascar. To our knowledge, M. fastuosus has not been collected for nearly 50 years. To evaluate the power of our techniques to recover DNA, we used a single foreleg of an at least 140-year-old holotype specimen from the collection of the Natural History Museum London with no destruction of external morphology to extract DNA and assemble a complete mitogenome from next generation sequencing reads. The resulting 15 540 bp mitogenome contains 13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes, and an A+T rich region, similarly to other Lepidoptera mitogenomes. Here we provide the first mitogenome also for Trapezitinae (Rachelia extrusus). Phylogenetic analysis of available skipper mitogenomes places Malaza outside of Trapezitinae and Barcinae + Hesperiinae, with a possible sister relationship to Heteropterinae. Of these, at least Heteropterinae, Trapezitinae, and almost all Hesperiinae have monocot-feeding caterpillars. Malaza appears to be an evolutionarily highly distinct ancient lineage, morphologically with several unusual hesperiid features. The monotypic subfamily Malazinae Lees & Grishin subfam. nov. (type genus Malaza) is proposed to reflect this morphological and molecular evidence.


Assuntos
Borboletas/genética , Genoma Mitocondrial/genética , Lepidópteros/genética , Animais , Feminino , Sequenciamento de Nucleotídeos em Larga Escala , Masculino , Filogenia , Análise de Sequência de DNA
4.
Aust J Rural Health ; 28(2): 218-223, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32390207

RESUMO

OBJECTIVE: Tasmania is one of the 12 Australian sites chosen to participate in the National Suicide Prevention Trial. The Centre for Rural Health, University of Tasmania, was contracted to conduct a local-level, process evaluation of this initiative using a Participatory Action Research approach, with the objective of this article to summarise progress and key learnings from the local evaluation to date. DESIGN: Empowerment and Utilisation-Focus Evaluation theoretical approaches informed the conduct of process evaluation activities, within an overarching participatory action research approach. SETTING: Three participating regions in Tasmania were included as follows: Launceston, the North-West and Break O'Day. PARTICIPANTS: Working group members, service providers and other relevant stakeholders. INTERVENTIONS: Mixed-methods surveys, field observations and content analysis were conducted. RESULTS: Survey results indicated that most working group members understood the concept of a "systems-based" approach to suicide prevention. Most participants believed that working group structures/functions engaged community members with lived experience, while around half believed that these structures/functions facilitated relationships with local services and that working group action plans adequately addressed issues of capacity building and sustainability. Preliminary field data suggested that awareness raising, engagement and face-to-face capacity-building activities focused on the wider community were preferred to activities targeting specific populations. CONCLUSION: These preliminary findings suggest ambivalence among key stakeholders concerning the application of a systems-based approach to suicide prevention in regional areas of Tasmania. Consistent with a participatory action research approach, the findings will inform the evolution of trial site activity for the remainder of the trial and, in due course, the implementation of future such initiatives.


Assuntos
Pesquisa Participativa Baseada na Comunidade , Pesquisa sobre Serviços de Saúde , Avaliação de Programas e Projetos de Saúde , Prevenção do Suicídio , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Serviços de Saúde Rural , Análise de Sistemas , Tasmânia/epidemiologia
5.
Mol Phylogenet Evol ; 130: 60-66, 2019 01.
Artigo em Inglês | MEDLINE | ID: mdl-30278254

RESUMO

The phylogenetic relationships of the nymphalid butterfly tribe Limenitidini are best known for the genera Limenitis and Adelpha, model taxa for evolutionary processes such as Batesian mimicry and rapid adaptive radiations. Whereas these American limenitidines have received the most attention, phylogenetic relationships of their Asian relatives are still controversial and largely unexplored. Even one of the largest genera in Asia, Athyma, is polyphyletic. To clarify the phylogenetic relationships of these Asian Limenitidini, a total of 53 representatives were sampled; 37 have their mitogenomes sequenced for the first time. Our phylogenetic results confirm that mitogenomic data provides well-resolved relationships at most major levels of the phylogeny, even using different partition schemes or different inference methods. Interestingly, our results show that some Athyma taxa are embedded within the genus Limenitis, whereas the genus Tacola, previously considered to be a synonym of Athyma, needs to be recognized as a valid clade. Additionally, the other Limenitidini genera in Asia (namely Tarattia, Litinga, Sumalia, Pandita and Patsuia) are now grouped either within Athyma or Limenitis, so these genera need to be sunk. Importantly, we also show that the mainly Old World Limenitis and entirely New World Adelpha are sister groups, confirming the relevance of Asian lineages to global studies of Limenitis evolution.


Assuntos
Borboletas/classificação , Borboletas/genética , Genoma de Inseto/genética , Genoma Mitocondrial/genética , Filogenia , Animais , Ásia
6.
Genome ; 62(3): 108-121, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30184444

RESUMO

Madagascar is a prime evolutionary hotspot globally, but its unique biodiversity is under threat, essentially from anthropogenic disturbance. There is a race against time to describe and protect the Madagascan endangered biota. Here we present a first molecular characterization of the micromoth fauna of Madagascar. We collected 1572 micromoths mainly using light traps in both natural and anthropogenically disturbed habitats in 24 localities across eastern and northwest Madagascar. We also collected 1384 specimens using a Malaise trap in a primary rain forest at Andasibe, eastern Madagascar. In total, we DNA barcoded 2956 specimens belonging to 1537 Barcode Index Numbers (BINs), 88.4% of which are new to BOLD. Only 1.7% of new BINs were assigned to species. Of 47 different families found, Dryadaulidae, Bucculatricidae, Bedelliidae, Batrachedridae, and Blastobasidae are newly reported for Madagascar and the recently recognized Tonzidae is confirmed. For test faunas of Canada and Australia, 98.9%-99.4% of Macroheterocera BINs exhibited the molecular synapomorphy of a phenylalanine in the 177th complete DNA barcode codon. Non-macroheteroceran BINs could thus be sifted out efficiently in the Malaise sample. The Madagascar micromoth fauna shows highest affinity with the Afrotropics (146 BINs also occur in the African continent). We found 22 recognised pests or invasive species, mostly occurring in disturbed habitats. Malaise trap samples show high temporal turnover and alpha diversity with as many as 507 BINs collected; of these, astonishingly, 499 (98.4%) were novel to BOLD and 292 (57.6%) were singletons. Our results provide a baseline for future surveys across the island.


Assuntos
Biodiversidade , Código de Barras de DNA Taxonômico/métodos , DNA/genética , Ecossistema , Espécies Introduzidas/estatística & dados numéricos , Mariposas/classificação , Mariposas/genética , Animais , DNA/análise , Madagáscar
7.
Issues Ment Health Nurs ; 40(1): 21-27, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30204033

RESUMO

Criticism of public mental services provided to Indigenous Australians have persisted over the last two decades, despite several national reports and policies that have attempted to promote positive service change. Mental health nurses represent the largest professional group practising within these services. This paper reports on a multi-sited ethnography of mental health nursing practice as it relates to this group of mental health service users. It explores the beliefs and ideas that nurses identified about specialist mental health nursing practice and Indigenous Australians. The study found a disunited approach to practice during the fieldwork. Practice was expressed as a series of individual constructions built upon the nurses' beliefs about Indigenous Australians and their experiences in practice with these peoples. The criticism of mental health services from Indigenous communities was understandable to the mental health nurses, but how they could address this through their individual practices was not always clear to them. The actions by public mental health services to improve cultural safety through generic training related to the broad area of Indigenous health and health service needs, does not appear to evolve into informed specialist mental health nursing practice for Indigenous Australian service users.


Assuntos
Serviços de Saúde do Indígena/organização & administração , Serviços de Saúde Mental/organização & administração , Havaiano Nativo ou Outro Ilhéu do Pacífico , Padrões de Prática em Enfermagem , Enfermagem Psiquiátrica , Antropologia Cultural , Atitude do Pessoal de Saúde , Austrália , Competência Clínica , Competência Cultural , Feminino , Humanos , Masculino
8.
Crit Rev Food Sci Nutr ; 58(16): 2854-2865, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-28723228

RESUMO

Norovirus (NoV) and Hepatitis A virus (HAV) are the most important viral hazards associated with human illness following consumption of contaminated bivalve molluscs. The effectiveness of the current EU criteria for heat processing of bivalve molluscs (i.e. raising the temperature of the internal mollusc flesh to at least 90°C for a minimum of 90 seconds) was evaluated using predictive microbiology. A HAV thermal inactivation model was developed based on literature data in mollusc matrices during isothermal heat treatment. Application of the developed model demonstrated that the 90°C-90 s requirement may lead to significantly different virus inactivation depending on the commercial process design. This shows the need for the establishment of a Performance Criterion for bivalve molluscs heat processing which will assure a common specified level of consumer protection. A risk-based approach is described that allows for an effective processing design providing a more transparent and objective relation between the thermal processing targets and public health. Model simulations demonstrate that the F-value is a more appropriate Process Criterion than a single time-temperature combination since it enables the food business operators to design a process that is compliant with the safety requirements while at the same time achieving a desired product quality.


Assuntos
Bivalves/virologia , Manipulação de Alimentos/métodos , Temperatura Alta , Vírus/efeitos da radiação , Animais , Inocuidade dos Alimentos
9.
Issues Ment Health Nurs ; 39(4): 366-368, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29668366

RESUMO

Nurses are expected to be loyal to their patients, employer and the nursing profession, while also remaining 'loyal' to their own values and aims as both a person and clinician. Loyalty therefore is of central importance to how we relate to people in personal and professional relationships and may affect our attitude to the organization we work for. This column explores the concept of loyalty, and its role in professional relationships, behaviour and practice. Ways that loyalty can be influential in achieving personal, patient and organizational outcomes are explored and the potential to enhance loyalty is considered.


Assuntos
Atitude do Pessoal de Saúde , Lealdade ao Trabalho , Enfermagem Psiquiátrica , Humanos , Relações Interpessoais , Local de Trabalho
12.
Issues Ment Health Nurs ; 39(11): 967-976, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30204047

RESUMO

Enhancing therapeutic relationships between patients and staff is of central importance to improve the quality and safety of care in psychiatric inpatient units. However, there is limited evidence as to how therapeutic relationships may be enabled in this specific context. This paper presents findings of a study that explored the link between therapeutic relationships and safety in Iranian psychiatric inpatient units. In this exploratory, descriptive study, seven patients at the point of discharge and 19 staff in psychiatric inpatient units in Iran were interviewed regarding their experiences of care. The quality of staff-patient relationship in providing a safe environment was categorized into two groups of "facilitators" and "inhibitors". Facilitators of a safe environment included "supportive relationship with patients" and "improving patient capacity for self-efficacy/self-control". Inhibitors, on the other hand, included "detachment from patients" and "domination over patients", which ultimately limited safety on the ward. Findings indicate interrelated environmental, patient and staff factors mediating the potential for therapeutic relationships and quality and safety of care. Findings suggest the need for more effective preparation and support for staff working within psychiatric inpatient settings. In addition, environments more conducive to collaborative recovery-oriented practice are required to enhance therapeutic relationships and improve quality and safety of care. Both individual staff responsibility and effective leadership are required to realize change.


Assuntos
Segurança do Paciente , Relações Profissional-Paciente , Unidade Hospitalar de Psiquiatria , Adulto , Atitude do Pessoal de Saúde , Feminino , Hospitalização , Humanos , Irã (Geográfico) , Masculino , Pessoa de Meia-Idade
13.
Mar Drugs ; 15(9)2017 Aug 30.
Artigo em Inglês | MEDLINE | ID: mdl-28867772

RESUMO

Tetrodotoxins (TTXs) are traditionally associated with the occurrence of tropical Pufferfish Poisoning. In recent years, however, TTXs have been identified in European bivalve mollusc shellfish, resulting in the need to assess prevalence and risk to shellfish consumers. Following the previous identification of TTXs in shellfish from southern England, this study was designed to assess the wider prevalence of TTXs in shellfish from around the coast of the UK. Samples were collected between 2014 and 2016 and subjected to analysis using HILIC-MS/MS. Results showed the continued presence of toxins in shellfish harvested along the coast of southern England, with the maximum concentration of total TTXs reaching 253 µg/kg. TTX accumulation was detected in Pacific oysters (Crassostreagigas), native oysters (Ostreaedulis) common mussels (Mytilusedulis) and hard clams (Mercenariamercenaria), but not found in cockles (Cerastodermaedule), razors (Ensis species) or scallops (Pectenmaximus). Whilst the highest concentrations were quantified in samples harvested during the warmer summer months, TTXs were still evident during the winter. An assessment of the potential causative factors did not reveal any links with the phytoplankton species Prorocentrumcordatum, instead highlighting a greater level of risk in areas of shallow, estuarine waters with temperatures above 15 °C.


Assuntos
Bivalves/química , Intoxicação por Frutos do Mar , Tetrodotoxina/análise , Animais , Espectrometria de Massas em Tandem , Reino Unido
14.
Euro Surveill ; 21(3): 30113, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26836217

RESUMO

This report describes an outbreak investigation starting with two closely related suspected food-borne clusters of Dutch hepatitis A cases, nine primary cases in total, with an unknown source in the Netherlands. The hepatitis A virus (HAV) genotype IA sequences of both clusters were highly similar (459/460 nt) and were not reported earlier. Food questionnaires and a case-control study revealed an association with consumption of mussels. Analysis of mussel supply chains identified the most likely production area. International enquiries led to identification of a cluster of patients near this production area with identical HAV sequences with onsets predating the first Dutch cluster of cases. The most likely source for this cluster was a case who returned from an endemic area in Central America, and a subsequent household cluster from which treated domestic sewage was discharged into the suspected mussel production area. Notably, mussels from this area were also consumed by a separate case in the United Kingdom sharing an identical strain with the second Dutch cluster. In conclusion, a small number of patients in a non-endemic area led to geographically dispersed hepatitis A outbreaks with food as vehicle. This link would have gone unnoticed without sequence analyses and international collaboration.


Assuntos
Bivalves/virologia , Surtos de Doenças/estatística & dados numéricos , Genoma Viral , Vírus da Hepatite A/genética , Hepatite A/epidemiologia , Frutos do Mar/virologia , Adolescente , Adulto , Animais , Estudos de Casos e Controles , América Central , Embrião de Galinha , Criança , Análise por Conglomerados , Feminino , Genótipo , Hepatite A/diagnóstico , Hepatite A/virologia , Vírus da Hepatite A/isolamento & purificação , Humanos , Masculino , Dados de Sequência Molecular , Países Baixos/epidemiologia , Filogenia , RNA Viral/sangue , RNA Viral/genética , RNA Viral/isolamento & purificação , Fatores de Risco , Análise de Sequência de DNA , Viagem , Reino Unido/epidemiologia
16.
Nurse Res ; 23(4): 30-4, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26997233

RESUMO

AIM: To describe the research model developed and successfully deployed as part of a multi-method qualitative study investigating suicidal service-users' experiences of mental health nursing care. BACKGROUND: Quality mental health care is essential to limiting the occurrence and burden of suicide, however there is a lack of relevant research informing practice in this context. Research utilising first-person accounts of suicidality is of particular importance to expanding the existing evidence base. However, conducting ethical research to support this imperative is challenging. DISCUSSION: The model discussed here illustrates specific and more generally applicable principles for qualitative research regarding sensitive topics and involving potentially vulnerable service-users. CONCLUSION: Researching into mental health service users with first-person experience of suicidality requires stakeholder and institutional support, researcher competency, and participant recruitment, consent, confidentiality, support and protection. IMPLICATIONS: Research with service users into their experiences of sensitive issues such as suicidality can result in rich and valuable data, and may also provide positive experiences of collaboration and inclusivity. If challenges are not met, objectification and marginalisation of service-users may be reinforced, and limitations in the evidence base and service provision may be perpetuated.


Assuntos
Serviços de Saúde Mental/estatística & dados numéricos , Pesquisa em Enfermagem , Suicídio , Humanos , Pesquisa Qualitativa
17.
BMC Evol Biol ; 15: 167, 2015 Aug 20.
Artigo em Inglês | MEDLINE | ID: mdl-26289424

RESUMO

BACKGROUND: Butterflies of the subtribe Mycalesina have radiated successfully in almost all habitat types in Africa, Madagascar, the Indian subcontinent, Indo-China and Australasia. Studies aimed at understanding the reasons behind the evolutionary success of this spectacular Old World butterfly radiation have been hampered by the lack of a stable phylogeny for the group. Here, we have reconstructed a robust phylogenetic framework for the subtribe using 10 genes from 195 exemplar taxa. RESULTS: We recovered seven well supported clades within the subtribe corresponding to the five traditional genera (Lohora, Heteropsis, Hallelesis, Bicyclus, Mycalesis), one as recently revised (Mydosama) and one newly revised genus (Culapa). The phylogenetic relationships of these mycalesine genera have been robustly established for the first time. Within the proposed phylogenetic framework, we estimated the crown age of the subtribe to be 40 Million years ago (Mya) and inferred its ultimate origin to be in Asia. Our results reveal both vicariance and dispersal as factors responsible for the current widespread distribution of the group in the Old World tropics. We inferred that the African continent has been colonized at least twice by Asian mycalesines within the last 26 and 23 Mya. In one possible scenario, an Asian ancestor gave rise to Heteropsis on continental Africa, which later dispersed into Madagascar and most likely back colonised Asia. The second colonization of Africa by Asian ancestors resulted in Hallelesis and Bicyclus on continental Africa, the descendants of which did not colonise other regions but rather diversified only in continental Africa. The genera Lohora and Mydosama are derivatives of ancestors from continental Asia. CONCLUSION: Our proposed time-calibrated phylogeny now provides a solid framework within which we can implement mechanistic studies aimed at unravelling the ecological and evolutionary processes that culminated in the spectacular radiation of mycalesines in the Old World tropics.


Assuntos
Borboletas/classificação , Borboletas/genética , África , Animais , Ásia , Austrália , Evolução Biológica , Ecossistema , Filogenia , Filogeografia
18.
Mol Phylogenet Evol ; 85: 230-7, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-25698356

RESUMO

A phylogenetic hypothesis for the lepidopteran superfamily Noctuoidea was inferred based on the complete mitochondrial (mt) genomes of 12 species (six newly sequenced). The monophyly of each noctuoid family in the latest classification was well supported. Novel and robust relationships were recovered at the family level, in contrast to previous analyses using nuclear genes. Erebidae was recovered as sister to (Nolidae+(Euteliidae+Noctuidae)), while Notodontidae was sister to all these taxa (the putatively basalmost lineage Oenosandridae was not included). In order to improve phylogenetic resolution using mt genomes, various analytical approaches were tested: Bayesian inference (BI) vs. maximum likelihood (ML), excluding vs. including RNA genes (rRNA or tRNA), and Gblocks treatment. The evolutionary signal within mt genomes had low sensitivity to analytical changes. Inference methods had the most significant influence. Inclusion of tRNAs positively increased the congruence of topologies, while inclusion of rRNAs resulted in a range of phylogenetic relationships varying depending on other analytical factors. The two Gblocks parameter settings had opposite effects on nodal support between the two inference methods. The relaxed parameter (GBRA) resulted in higher support values in BI analyses, while the strict parameter (GBDH) resulted in higher support values in ML analyses.


Assuntos
Genoma de Inseto , Genoma Mitocondrial , Mariposas/classificação , Filogenia , Animais , Teorema de Bayes , DNA Mitocondrial/genética , Ordem dos Genes , Lepidópteros/genética , Funções Verossimilhança , Mariposas/genética , RNA Ribossômico/genética , RNA de Transferência/genética , Análise de Sequência de DNA
19.
Mol Phylogenet Evol ; 93: 296-306, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-26265256

RESUMO

We present the first dated higher-level phylogenetic and biogeographic analysis of the butterfly family Riodinidae. This family is distributed worldwide, but more than 90% of the c. 1500 species are found in the Neotropics, while the c. 120 Old World species are concentrated in the Southeast Asian tropics, with minor Afrotropical and Australasian tropical radiations, and few temperate species. Morphologically based higher classification is partly unresolved, with genera incompletely assigned to tribes. Using 3666bp from one mitochondrial and four nuclear markers for each of 23 outgroups and 178 riodinid taxa representing all subfamilies, tribes and subtribes, and 98 out of 145 described genera of riodinids, we estimate that Riodinidae split from Lycaenidae about 96Mya in the mid-Cretaceous and started to diversify about 81Mya. The Riodinidae are monophyletic and originated in the Neotropics, most likely in lowland proto-Amazonia. Neither the subfamily Euselasiinae nor the Nemeobiinae are monophyletic as currently constituted. The enigmatic, monotypic Neotropical genera Styx and Corrachia (most recently treated in Euselasiinae: Corrachiini) are highly supported as derived taxa in the Old World Nemeobiinae, with dispersal most likely occurring across the Beringia land bridge during the Oligocene. Styx and Corrachia, together with all other nemeobiines, are the only exclusively Primulaceae-feeding riodinids. The steadily increasing proliferation of the Neotropical Riodininae subfamily contrasts with the decrease in diversification in the Old World, and may provide insights into factors influencing the diversification rate of this relatively ancient clade of Neotropical insects.


Assuntos
Borboletas/genética , Animais , Teorema de Bayes , Borboletas/classificação , Genes de Insetos , Especiação Genética , Filogenia , Filogeografia
20.
Toxicol Pathol ; 43(3): 376-83, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-25112279

RESUMO

Diacylglycerol O-acyltransferase 1 (DGAT1) plays an important role in synthesizing lipids, and inhibitors of DGAT1 have been investigated as potential treatments for diabetes and metabolic diseases. DGAT1 knockout (-/-) mice are resistant to obesity, have increased sensitivity to insulin, and exhibit sebaceous gland atrophy and alopecia. Prolonged pharmacological inhibition of DGAT1 with AZD7687 in mice results in the same skin phenotype, including sebaceous gland atrophy and alopecia, as seen in the skin of DGAT1 (-/-) mice. AZD7687-mediated effects on the skin were dose- and time-dependent and reversible. They occurred only at substantial levels of continuous DGAT1 inhibition. Prolonged treatment of dogs with AZD7687 also resulted in sebaceous gland atrophy but did not result in the more adverse skin changes of hair loss and skin lesions. Our findings highlight a significant risk of generating the same lesions that were seen in mouse skin during clinical development of DGAT1 inhibitors in humans and also reveal a species difference in the effects on the skin, indicating that the mouse may be an especially sensitive species. Therefore, although human therapeutic doses may not have the same influence on skin morphology as seen in mice, monitoring of skin changes will be essential in clinical trials with DGAT1 inhibitors.


Assuntos
Acetatos/toxicidade , Alopecia/patologia , Diacilglicerol O-Aciltransferase/antagonistas & inibidores , Pirazinas/toxicidade , Glândulas Sebáceas/patologia , Pele/patologia , Alopecia/induzido quimicamente , Animais , Cães , Relação Dose-Resposta a Droga , Inibidores Enzimáticos/toxicidade , Feminino , Resistência à Insulina/genética , Masculino , Camundongos , Camundongos Endogâmicos ICR , Camundongos Knockout , Glândulas Sebáceas/efeitos dos fármacos
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa