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Motivation is critical for meaningful learning among healthcare students studying anatomy. Learners are highly variable, and it is important to ensure learners are equally supported in the diverse aspects of an anatomy curriculum. The implementation of the educational framework, Universal Design for Learning (UDL), in anatomy curricula could potentially enhance student motivation. The multiple means of engagement principle of UDL refers to the enhancement of motivation among students. This study aimed to identify healthcare students' motivation levels at the start and end of their anatomy module and whether there was any change in motivation. The Motivated Strategies for Learning Questionnaire (MSLQ) was distributed to gather the self-reported motivation levels of first-year undergraduate medical, dental and occupational therapy (OT) and speech and language therapy (SLT) students studying anatomy at the start of their respective anatomy modules and again at the end of the module. The overall response rate was 74% and 69%, at the start and end of the study, respectively. Responses were analysed by the respective programme of study. Motivation to study anatomy among medical, dental, OT and SLT students ranged from medium to high on the MSLQ at the start of their respective anatomy modules. By the end of the anatomy modules, dental students reported high levels of motivation to study anatomy, whereas motivation among medical, OT and SLT students ranged from medium to high. A change in students' self-reported motivation levels while studying anatomy was identified. The study emphasises the benefits of UDL and its flexible nature to enhance motivation.
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OBJECTIVES: Challenging transitions, increased stress and mental ill health can affect students' academic performance and their capacity to remain in higher education. Prevention and early treatment of mental health problems in college students is therefore a key public health priority, nationally and internationally. Developing a range of evidence-based interventions targeting the mental health of students is critical. We examined the feasibility and acceptability of a new universal time use and well-being intervention, the 'Everyday Matters: Healthy Habits for University Life' digital badge (EMDB), a co-curricular micro-credential for first-year college students. METHODS: This study used a single-arm, pre-post design for first-year undergraduate students. The EMDB comprised eight 1-hour lunchtime sessions on brain development and time-use habits across the 24 hours of the day including sleep, self-care, leisure, study and work. Validated measures of occupational competence and value, mental well-being, sleep health, mindset, self-compassion and gratitude were completed, along with an evaluation questionnaire. RESULTS: Eight first-year undergraduate students completed the demographic questionnaire and pre- and post- measures, with one additional student completing only the evaluation questionnaire. There was significantly improved levels of well-being, self-compassion and growth mindset following the intervention. Many of the challenges reported by participants related to occupational issues such as managing finances and having a satisfying routine. Participants appreciated the practical relevance and scientific underpinnings of the programme content. The sense of belonging within the group and having insightful conversations with other group members were particularly valued by participants. CONCLUSIONS: This study offers preliminary evidence that an occupational therapy based universal time-use and well-being intervention was feasible to deliver and acceptable to first-year undergraduate students. The results of this study and the participant acceptability support further development and evaluation of the EMDB intervention.
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COVID-19 , Parada Cardíaca , Parada Cardíaca/epidemiologia , Parada Cardíaca/terapia , Hospitais , Humanos , Incidência , SARS-CoV-2RESUMO
Red palm mites (Raoiella indica Hirst, Acari: Tenuipalpidae) were first observed in the western hemisphere on the islands and countries surrounding the Caribbean Sea, infesting the coconut palm (Cocos nucifera L.). Detection of invasive pests usually relies upon changes in vegetation properties as result of the pest activity. These changes may be visible in time series of satellite data records, such as Landsat satellites, which have been available with a 16-day repeat cycle at a spatial resolution of 30 m since 1982. Typical red palm mite infestations result in the yellowing of the lower leaves of the palm crown; remote sensing model simulations have indicated that this feature may be better detected using the green normalized difference vegetation index (GNDVI). Using the Google Earth Engine programming environment, a time series of Landsat 5 Thematic Mapper, Landsat 7 Enhanced Thematic Mapper Plus and Landsat 8 Operational Land Imager data was generated for plantations in northern and northeast Brazil, El Salvador, and Trinidad-Tobago. Considering the available studied plantations, there were little or no differences of GNDVI before and after the dates when red palm mites were first revealed at each location. A discussion of possible alternative approaches are discussed related to the limitations of the current satellite platforms.
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BACKGROUND: Children from low-income families experience accelerated BMI gain and learning loss during summer. Healthy Summer Learners (HSL) addresses accelerated BMI gain and academic learning loss during summer by providing academic- and health-focused programming. This manuscript reports the effects of HSL on underlying obesogenic behaviors (i.e., physical activity, screen time, sleep, diet) that lead to accelerated summer BMI gain, a necessary first step to informing a future randomized controlled trial of HSL. METHODS: In the summer of 2018 and 2019 using a quasi-experimental study design, 180 children (90 per summer, 7.9 years [SD = 1.0], 94% non-Hispanic Black, 40% male) at two schools (i.e., one per summer) who were struggling academically (25-75% on a standardized reading test) were provided a free, school-based 6-week health- and academic-focused summer program (i.e., HSL, n = 60), a 4- to 6-week academic-focused summer program (i.e., 21st Century Summer Learning program (21C), n = 60), or no summer program (n = 60). Children wore the Fitbit Charge 2™ over a 10-week period during the summers (June-Aug) of 2018-2019. Differences within (within child days attend vs. not attend) and between (differences between groups attend vs. not attend) were evaluated using mixed effects linear regression. RESULTS: Regression estimates indicated that, on days attending, HSL children experienced a greater reduction in sedentary minutes (- 58.6 [95% CI = - 92.7, - 24.4]) and a greater increase in moderate-to-vigorous physical activity (MVPA) (36.2 [95% CI = 25.1, 47.3]) and steps (2799.2 [95% CI = 2114.2, 3484.2]) compared to 21C children. However, both HSL and 21C children were more active (i.e., greater MVPA, total steps) and less sedentary (i.e., less sedentary minutes and total screen time) and displayed better sleeping patterns (i.e., earlier and less variability in sleep onset and offset) on days they attended than children in the control. CONCLUSIONS: HSL produced greater changes in physical activity than 21C. However, attendance at either HSL or 21C leads to more healthy obesogenic behaviors. Based on the behavioral data in this pilot study, a larger trial may be warranted. These results must be considered along with the pending primary outcomes (i.e., academics and BMI z-score) of the HSL pilot to determine if a full-scale trial is warranted. TRIAL REGISTRATION: NIH-NCT03321071. Registered 25 October 2017.
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Prisoners' access to healthcare should mirror that of the general public, but is adversely affected by challenges in recruiting nurses to work in custodial settings, potentially impacting on prisoner well-being. To address this issue prison-based insight-days have been developed jointly by one university and prison to positively influence students' views of undertaking placements in custodial settings because nurses are known to subsequently seek employment in areas where they have had positive student placements. A phenomenological investigation explored student nurses' lived experiences of prison-based insight-days. Questionnaires and interviews were used to gather qualitative data about students' feelings both prior to and following the insight-day (n = 17). All data was thematically analysed resulting in four themes: pre-placement curiosity, escalating admission anxiety, calming down inside and post-placement decision making. The empirical findings showed that first-hand exposure to prisoners, and to the realities of a working prison, were crucial factors in dispelling stereotypes and addressing negative preconceptions of prison healthcare environments, as students could find prison placements unexpectedly appealing. Drawing on the findings, this paper recommends that facilitating prison insight-days within custodial settings may be one way to encourage students to undertake prison placements.
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Atitude do Pessoal de Saúde , Percepção , Prisões , Estudantes de Enfermagem/psicologia , Bacharelado em Enfermagem , Feminino , Humanos , Pesquisa Qualitativa , Inquéritos e QuestionáriosRESUMO
The multikinase inhibitor sorafenib, and opening of voltage dependent anion channels (VDAC) by the erastin-like compound X1 promotes oxidative stress and mitochondrial dysfunction in hepatocarcinoma cells. Here, we hypothesized that X1 and sorafenib induce mitochondrial dysfunction by increasing reactive oxygen species (ROS) formation and activating c-Jun N-terminal kinases (JNKs), leading to translocation of activated JNK to mitochondria. Both X1 and sorafenib increased production of ROS and activated JNK. X1 and sorafenib caused a drop in mitochondrial membrane potential (ΔΨ), a readout of mitochondrial metabolism, after 60 min. Mitochondrial depolarization after X1 and sorafenib occurred in parallel with JNK activation, increased superoxide (O2â¢-) production, decreased basal and oligomycin sensitive respiration, and decreased maximal respiratory capacity. Increased production of O2â¢- after X1 or sorafenib was abrogated by JNK inhibition and antioxidants. S3QEL 2, a specific inhibitor of site IIIQo, at Complex III, prevented depolarization induced by X1. JNK inhibition by JNK inhibitors VIII and SP600125 also prevented mitochondrial depolarization. After X1, activated JNK translocated to mitochondria as assessed by proximity ligation assays. Tat-Sab KIM1, a peptide selectively preventing the binding of JNK to the outer mitochondrial membrane protein Sab, blocked the depolarization induced by X1 and sorafenib. X1 promoted cell death mostly by necroptosis that was partially prevented by JNK inhibition. These results indicate that JNK activation and translocation to mitochondria is a common mechanism of mitochondrial dysfunction induced by both VDAC opening and sorafenib.
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Proteínas Quinases JNK Ativadas por Mitógeno/metabolismo , Mitocôndrias/metabolismo , Sorafenibe/farmacologia , Canais de Ânion Dependentes de Voltagem/metabolismo , Antracenos/farmacologia , Antineoplásicos/farmacologia , Carcinoma Hepatocelular/metabolismo , Carcinoma Hepatocelular/patologia , Morte Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Ativação Enzimática/efeitos dos fármacos , Células Hep G2 , Humanos , Proteínas Quinases JNK Ativadas por Mitógeno/antagonistas & inibidores , Neoplasias Hepáticas/metabolismo , Neoplasias Hepáticas/patologia , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Mitocôndrias/efeitos dos fármacos , Estresse Oxidativo/efeitos dos fármacos , Transporte Proteico/efeitos dos fármacos , Espécies Reativas de Oxigênio/metabolismoRESUMO
Gastro-Oesophageal Reflux (GOR) has been associated with chronic airway diseases while the passage of foreign matter into airways and lungs through aspiration has the potential to initiate a wide spectrum of pulmonary disorders. The clinical syndrome resulting from such aspiration will depend both on the quantity and nature of the aspirate as well as the individual host response. Aspiration of gastric fluids may cause damage to airway epithelium, not only because acidity is toxic to bronchial epithelial cells but also due to the effect of digestive enzymes such as pepsin and bile salts. Experimental models have shown that direct instillation of these factors to airways epithelia cause damage with a consequential inflammatory response. The pathophysiology of these responses is gradually being dissected, with better understanding of acute gastric aspiration injury, a major cause of acute lung injury, providing opportunities for therapeutic intervention and potentially, ultimately, improved understanding of the chronic airway response to aspiration. Ultimately, clarification of the inflammatory pathways which are related to micro-aspiration via pepsin and bile acid salts may eventually progress to pharmacological intervention and surgical studies to assess the clinical benefits of such therapies in driving symptom improvement or reducing disease progression.
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Exercise-Induced Bronchoconstriction (EIB) is an acute, transient airway narrowing occurring after exercise which may impact athletic performance. Studies report 10% of the general population and up to 90% of asthmatics experience EIB. Ninety-two players from three elite hurling squads underwent a spirometric field-based provocation test with real-time heart rate monitoring and lactate measurements to ensure adequate exertion. Players with a new diagnosis of EIB and those with a negative field-test but with a previous label of EIB or asthma underwent further reversibility testing and if negative, methacholine challenge. Eight (8.7%) of players had EIB, with one further athlete having asthma with a negative field test. Interestingly, only three out of 12 players who had previously been physician-labelled with EIB or asthma had their diagnosis objectively confirmed. Our study highlights the role of objective testing in EIB.
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Asma/complicações , Desempenho Atlético , Broncopatias/etiologia , Esportes , Asma/diagnóstico , Asma Induzida por Exercício/complicações , Asma Induzida por Exercício/diagnóstico , Broncopatias/diagnóstico , Broncopatias/epidemiologia , Testes de Provocação Brônquica , Constrição Patológica/epidemiologia , Constrição Patológica/etiologia , Humanos , PrevalênciaRESUMO
BACKGROUND: Sleep difficulties, alcohol use and mental illness are often related; military studies suggest that post-deployment is a high-risk period for sleep problems. AIMS: To examine the prevalence of post-deployment sleep difficulties in UK Armed Forces (UKAF) personnel and associations with alcohol use disorders (AUD) and any mental disorder (AMD) symptoms. METHODS: A prospective, self-report, observational study of UKAF members returning from Afghanistan, questionnaire data were collected immediately following and 6 months post-deployment. RESULTS: A total of 1636 participants provided study data at both time points. Twenty-three per cent of personnel reported sleep difficulties at follow-up; 11% reported sleep-related interference with daily functioning. Sleep problems were significantly associated with AUD and AMD. Initial post-deployment sleep problems were predictive of AMD but not AUD at follow-up. CONCLUSIONS: The disclosure of alcohol misuse and mental ill-health in UKAF personnel is often inhibited by stigmatizing beliefs; detection could be enhanced by inquiring about sleep problems which may be less stigmatizing than direct enquiries about alcohol misuse and psychological well-being.
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BACKGROUND: Previous studies have reported strong genetic and environmental overlap between antisocial-externalizing (factor 2; F2) features of psychopathy and borderline personality disorder (BPD) tendencies. However, this line of research has yet to examine etiological associations of affective-interpersonal (factor 1, F1) features of psychopathy with BPD tendencies. METHOD: The current study investigated differential phenotypic and genetic overlap of psychopathy factors 1 and 2 with BPD tendencies in a sample of over 250 male and female community-recruited adult twin pairs. RESULTS: Consistent with previous research, biometric analyses revealed strong genetic and non-shared environmental correlations of F2 with BPD tendencies, suggesting that common genetic and non-shared environmental factors contribute to both phenotypes. In contrast, negative genetic and non-shared environmental correlations were observed between F1 and BPD tendencies, indicating that the genetic factors underlying F1 serve as protective factors against BPD. No gender differences emerged in the analyses. CONCLUSIONS: These findings provide further insight into associations of psychopathic features - F1 as well as F2 - and BPD tendencies. Implications for treatment and intervention are discussed, along with how psychopathic traits may differentially influence the manifestation of BPD tendencies.
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Transtorno da Personalidade Antissocial/etiologia , Transtorno da Personalidade Antissocial/genética , Transtorno da Personalidade Borderline/etiologia , Transtorno da Personalidade Borderline/genética , Adulto , Doenças em Gêmeos , Feminino , Humanos , Masculino , Fenótipo , Fatores de Proteção , Fatores de Risco , Adulto JovemRESUMO
OBJECTIVES: The aim of this study was to evaluate inhaler technique and symptom control in patients with poorly controlled asthma at baseline and at follow-up in a dedicated asthma clinic in a tertiary hospital. We also investigated the impact of asthma on these patients' quality of life. METHODS: Patients referred to a newly established asthma clinic in Cork University Hospital were prospectively recruited over a 6-month period. Their inhaler technique was assessed by a pulmonary nurse specialist using a validated scoring system. They received instruction on inhaler usage when scores were suboptimal. Patients completed a validated asthma control questionnaire (ACQ) and asthma quality of life questionnaire (AQLQ). At follow-up 3-4 months later, the inhaler technique was reassessed and the ACQ questionnaire repeated. RESULTS: Forty-six patients were recruited (female = 74%), and 40/46 were followed up. Mean [SD] FEV1 % predicted at baseline = 76.5% [21.5]. About 63% of the patients were classified as incorrectly using their inhaler at their initial assessment. This decreased to 20% at follow-up, indicating an overall significant improvement in inhaler usage post-training (p = 0.003). ACQ scores improved significantly from median [interquartile range] 2.70 [1.66] to 2.00 [1.90] (p = 0.002). Baseline measurement indicated that patients' quality of life was moderately affected by asthma, with a median AQLQ score of 4.75 [1.97]. CONCLUSION: This study demonstrates the importance of educating and formally assessing inhaler technique in patients with asthma as a part of their ongoing clinical review.
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Antiasmáticos/administração & dosagem , Asma/tratamento farmacológico , Nebulizadores e Vaporizadores/estatística & dados numéricos , Cooperação do Paciente/estatística & dados numéricos , Educação de Pacientes como Assunto/métodos , Administração por Inalação , Adulto , Assistência Ambulatorial/métodos , Instituições de Assistência Ambulatorial , Asma/diagnóstico , Estudos de Coortes , Feminino , Seguimentos , Humanos , Irlanda , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Controle de Qualidade , Medição de Risco , Resultado do Tratamento , Adulto JovemRESUMO
BACKGROUND: Previous work reports an association between familial risk factors stemming from parental characteristics and offspring disruptive behavior disorders (DBDs). This association may reflect (a) the direct effects of familial environment and (b) a passive gene-environment correlation (r(GE)), wherein the parents provide both the genes and the environment. The current study examined the contributions of direct environmental influences and passive r(GE) by comparing the effects of familial risk factors on child DBDs in genetically related (biological) and non-related (adoptive) families. METHOD: Participants were 402 adoptive and 204 biological families. Familial environment was defined as maternal and paternal maladaptive parenting and antisociality, marital conflict and divorce; offspring DBDs included attention deficit hyperactivity disorder (ADHD), conduct disorder (CD) and oppositional defiant disorder (ODD). Mixed-level regressions estimated the main effects of familial environment, adoption status and the familial environment by adoption status interaction term, which tested for the presence of passive r(GE). RESULTS: There was a main effect of maternal and paternal maladaptive parenting and marital discord on child DBDs, indicating a direct environmental effect. There was no direct environmental effect of maternal or paternal antisociality, but maternal and paternal antisociality had stronger associations with child DBDs in biological families than adoptive families, indicating the presence of a passive r(GE). CONCLUSIONS: Many familial risk factors affected children equally across genetically related and non-related families, providing evidence for direct environmental effects. The relationship of parental antisociality and offspring DBDs was best explained by a passive r(GE), where a general vulnerability toward externalizing psychopathology is passed down by the parents to the children.
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Transtornos de Deficit da Atenção e do Comportamento Disruptivo/etiologia , Transtornos de Deficit da Atenção e do Comportamento Disruptivo/genética , Relações Familiares , Interação Gene-Ambiente , Predisposição Genética para Doença , Pais/psicologia , Adolescente , Adoção/psicologia , Adulto , Criança , Transtorno da Conduta/etiologia , Transtorno da Conduta/genética , Divórcio/psicologia , Conflito Familiar/psicologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Relações Pais-Filho , Poder Familiar/psicologia , Fatores de Risco , Adulto JovemRESUMO
BACKGROUND: A major incident involving multiple fatalities occurred in Cumbria, England on 2 June 2010. The Cumbrian Constabulary deployed an organizational peer support response for personnel involved known as trauma risk management (TRiM). AIMS: To examine data routinely gathered during the TRiM process to evaluate the relationship of the intervention to sickness absence. METHODS: Using incident databases, details were gathered regarding exposure to the murders and type of TRiM intervention, including an assessment of the psychological risk to the individual of developing a trauma-related mental health problem. Sociodemographic information was collated by the occupational health department. Cumulative sickness absence data in the 2 months following the murders were used as a proxy for mental health status. RESULTS: A total of 717 police officers and civilian support staff were identified. High levels of traumatic exposure were associated with subsequent receipt of a TRiM intervention. The majority of psychological risk indices reduced between the initial and subsequent evaluation. Greater traumatic exposure was associated with longer sickness absence lengths. Engagement in the TRiM process was associated with a reduction in sickness absence especially in more junior ranks. CONCLUSIONS: In this study, we found that TRiM deployed within a police force responding to a major event offered a way of structuring a response for those involved. Our data suggest that TRiM may offer a way of assessing psychological risk so that officers can be offered early supportive interventions. Our data suggest that TRiM may help to ameliorate some of the negative effects of high trauma exposure.
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Doenças Profissionais/prevenção & controle , Polícia/estatística & dados numéricos , Gestão de Riscos/métodos , Licença Médica/estatística & dados numéricos , Transtornos de Estresse Pós-Traumáticos/prevenção & controle , Adulto , Inglaterra/epidemiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Doenças Profissionais/psicologia , Grupo Associado , Transtornos de Estresse Pós-Traumáticos/psicologia , Adulto JovemRESUMO
BACKGROUND: Recently, proposals have been made to improve mental health care for U.K. military veterans. Combat stress (CS), a veteran's charity, has provided mental health services for veterans since 1919. Since 2003, service users have included veterans from the Iraq and Afghanistan conflicts; however, their pattern of help-seeking has not been evaluated. AIMS: To describe the characteristics of the veteran population of the recent Iraq or Afghanistan conflicts who sought help from CS between 2003 and May 2011. METHODS: CS Iraq and Afghanistan veteran clinical and welfare records were evaluated. RESULTS: Nine hundred and eighty-eight records were evaluated. The median time for veterans of recent conflicts to seek help from CS since discharge from military service was ~2 years, considerably shorter than the mean time of 14 years previously estimated by CS. Approximately, three-quarters of the veterans receiving a full clinical assessment (n = 114), received a diagnosis of post traumatic stress disorder (PTSD) (n = 87). Approximately half of the clinically assessed veterans self-referred to CS (51%); their most frequent diagnosis was PTSD. CONCLUSIONS: Veterans who have served in Iraq and Afghanistan are presenting to Combat stress sooner, and at a younger age, than veterans of previous conflicts and operations.
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Distúrbios de Guerra/diagnóstico , Militares/psicologia , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Veteranos/psicologia , Adulto , Campanha Afegã de 2001- , Idoso , Distúrbios de Guerra/epidemiologia , Feminino , Humanos , Guerra do Iraque 2003-2011 , Masculino , Pessoa de Meia-Idade , Reino Unido , Adulto JovemRESUMO
We report the earliest recognized fatality associated with laboratory-confirmed pandemic H1N1 (pH1N1) influenza in a domestic cat in the United States. The 12-year old, indoor cat died on 6 November 2009 after exposure to multiple family members who had been ill with influenza-like illness during the peak period of the fall wave of pH1N1 in Pennsylvania during late October 2009. The clinical presentation, history, radiographic, laboratory and necropsy findings are presented to assist veterinary care providers in understanding the features of this disease in cats and the potential for transmission of infection to pets from infected humans.
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Doenças do Gato/virologia , Vírus da Influenza A Subtipo H1N1 , Infecções por Orthomyxoviridae/veterinária , Animais , Doenças do Gato/epidemiologia , Gatos , Evolução Fatal , Humanos , Influenza Humana/epidemiologia , Influenza Humana/transmissão , Masculino , Infecções por Orthomyxoviridae/epidemiologia , Infecções por Orthomyxoviridae/virologia , Pandemias , Pennsylvania/epidemiologiaRESUMO
Microarray technology was used to identify the genes associated with disease defence responses in the model legume Medicago truncatula. Transcript profiles from M. truncatula cv. Jemalong genotype A17 leaves inoculated with Colletotrichum trifolii and Erysiphe pisi and roots infected with Phytophthora medicaginis were compared to identify the genes expressed in response to all three pathogens and genes unique to an interaction. The A17 genotype is resistant to C. trifolii and E. pisi, exhibiting a hypersensitive response after inoculation, and is moderately susceptible to P. medicaginis. Among the most strongly up-regulated genes in all three interactions were those encoding a hevein-like protein, thaumatin-like protein (TLP) and members of the pathogenesis response (PR)10 family. Transcripts of genes for enzymes in the phenylpropanoid pathway leading to the production of isoflavonoid phytoalexins increased dramatically in response to inoculation with the foliar pathogens. In P. medicaginis-inoculated roots, transcripts of genes in the phenylpropanoid pathway peaked at 5 days post-inoculation, when symptoms became visible. Transcript accumulation of three PR10 family members, a TLP and chalcone synthase (CHS) was assessed in M. truncatula genotype R108 plants. The R108 plants are resistant to C. trifolii and moderately susceptible to E. pisi and P. medicaginis. Transcript accumulation paralleled the stages of pathogen development. To evaluate the role of a TLP, a PR10 family member and CHS in disease resistance, transgenic R108 plants containing interfering RNA (RNAi) constructs were produced. Reduced expression of PR10 and TLP had no effect on the disease phenotype, whereas reduced expression of CHS resulted in increased susceptibility to necrotrophic pathogens.
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Medicago truncatula/metabolismo , Medicago truncatula/microbiologia , Aciltransferases/genética , Aciltransferases/metabolismo , Antígenos de Plantas/genética , Antígenos de Plantas/metabolismo , Colletotrichum/patogenicidade , Resistência à Doença/genética , Resistência à Doença/fisiologia , Genótipo , Análise em Microsséries , Fenótipo , Phytophthora/patogenicidade , Doenças das Plantas/microbiologia , Raízes de Plantas/metabolismo , Raízes de Plantas/microbiologia , Interferência de RNARESUMO
It is well known that standard population genetic theory predicts decreased additive genetic variance (V(a) ) following a population bottleneck and that theoretical models including interallelic and intergenic interactions indicate such loss may be avoided. However, few empirical data from multicellular model systems are available, especially regarding variance/covariance (V/CV) relationships. Here, we compare the V/CV structure of seventeen traits related to body size and composition between control (60 mating pairs/generation) and bottlenecked (2 mating pairs/generation; average F = 0.39) strains of mice. Although results for individual traits vary considerably, multivariate analysis indicates that V(a) in the bottlenecked populations is greater than expected. Traits with patterns and amounts of epistasis predictive of enhanced V(a) also show the largest deviations from additive expectations. Finally, the correlation structure of weekly weights is not significantly different between control and experimental lines but correlations between necropsy traits do differ, especially those involving the heart, kidney and tail length.
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Evolução Molecular , Variação Genética , Modelos Genéticos , Animais , Feminino , Endogamia , Masculino , Camundongos , Análise Multivariada , Dinâmica Populacional , Seleção GenéticaRESUMO
A new form of toxicity called equine fescue oedema is described. The clinical signs included inappetence, depression, and subcutaneous oedema of the head, neck, chest and abdomen. Affected horses had very low plasma albumin values. The toxicity affected 48 of 56 horses on six farms in different states of Australia, and 4 horses have died. All horses were grazing pastures that had been sown with varieties of Mediterranean tall fescue (Festuca arundinacea) that carry the endophyte known as Max P or Max Q. It is proposed that a pyrrolizidine alkaloid, N-acetyl norloline, which is produced by the Max P endophyte, may be responsible for this new toxicity in horses.