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1.
J Prev Alzheimers Dis ; 9(3): 435-440, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35841244

RESUMO

BACKGROUND: With the increasing focus on prevention of Alzheimer's disease, there is need for characterization of preclinical populations. Local participant registries offer an opportunity to facilitate research engagement via remote data collection, inform recruitment, and characterize preclinical samples, including individuals with subjective cognitive decline. OBJECTIVES: We sought to characterize subjective cognitive decline in a registry sample, as related to psychiatric history and related variables, including personality and loneliness, quality of life, and factors related to dementia risk (e.g., family history of dementia). DESIGN, SETTING, PARTICIPANTS: Participants were 366 individuals (mean age=67.2 (range 50-88), 65% female, 94% white, 97% non-Hispanic or Latino, 82% with at least a bachelor's degree) with no reported history of mild cognitive impairment or dementia. All participants had expressed interest in research, primarily via community outreach events and prior research involvement. Data was collected via electronic surveys, distributed using REDCap. Electronic questionnaires included questions on demographic variables, subjective cognitive decline, quality of life, loneliness, and personality. RESULTS: There was a high prevalence of risk factors for dementia in the registry sample (68% with family history of dementia, 31% with subjective cognitive decline). Subjective cognitive decline was more common in women and associated with history of depression, but not with family history of dementia. Subjective cognitive decline was also associated with lower conscientiousness and lower emotional stability, as well as higher loneliness and lower quality of life. Among participants who endorsed a psychiatric history, most reported onset more than 10 years prior, rather than within the last 10 years. CONCLUSIONS: Subjective cognitive decline in a registry sample may be more strongly associated with longstanding psychiatric and personality variables, rather than family history of dementia, adding to the literature on characterization of subjective cognitive decline across different settings. These findings highlight the acceptability of remote data collection and the potential of registries to inform recruitment by characterizing registrants, which may help to stratify dementia risk and match participants to eligible trials.


Assuntos
Doença de Alzheimer , Disfunção Cognitiva , Idoso , Disfunção Cognitiva/epidemiologia , Disfunção Cognitiva/psicologia , Feminino , Humanos , Solidão , Masculino , Personalidade , Qualidade de Vida , Sistema de Registros
2.
Aust Vet J ; 99(5): 178-180, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33559148

RESUMO

Eosinophilic intracytoplasmic neuronal inclusions resembling Negri bodies, but not associated with lyssaviral infection, were detected in the ventrolateral thalamus of a young-adult, male red kangaroo (Macropus rufus). Similar neuronal inclusions, also with a regional distribution in the brain, have been reported as an incidental, possibly age-related finding in other animal species.


Assuntos
Macropodidae , Tálamo , Animais , Encéfalo , Corpos de Inclusão Viral , Masculino
3.
Clin Nutr ESPEN ; 41: 299-304, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-33487280

RESUMO

BACKGROUND: Inflammatory bowel diseases (IBD) include ulcerative colitis (UC) and Crohn's disease (CD), incurable remitting-relapsing conditions that impact more than 3 million people in the United States alone. A diagnosis of IBD can be life-altering; patients must make significant adjustments to manage their symptoms, and this may include dietary changes. While diet may impact IBD symptoms and disease progression, there is currently no one diet recommendation for IBD patients to follow. Few studies explored patient beliefs and practices around their dietary intake. OBJECTIVE: Our objective was to identify patient beliefs, attitudes, and behaviors around diet in management of symptoms and flares in patients with IBD. METHODS: We conducted semi-structured interviews with patients N = 16 patients with UC or Crohn's colitis, recruited from an IBD center in a large metropolitan medical center. All patients were referred by their behavioral health provider. Interviews were transcribed verbatim; two analysts coded the transcripts using NVivo software. This analysis examines the themes derived from the questions about diet. RESULTS: The sample of participants in this study (N = 16) was adult patients of the IBD clinic with either UC or Crohn's disease in the colon. Three main themes emerged from our analysis: evolving attempts at controlling symptoms through diet (subthemes: initial attempts to modify diet to control symptoms, and food avoidance was commonly reported but safe foods were not), beliefs about how food affects IBD (subthemes: liquid nutrition rests the bowels, diet for general health is all that is needed for IBD management, and diet is part of IBD management), and perceptive eating. DISCUSSION: Our findings confirmed those from previous studies that patients with IBD do notice that eating certain foods induces symptoms, and controlling dietary intake is one way that they choose to manage symptoms of IBD. Some patients had beliefs about how food affects their IBD, whether by reducing inflammation, or giving the gut rest. We also noted that patients used perceptive eating in their approach to diet by using a combination of experience and knowledge.


Assuntos
Colite Ulcerativa , Doença de Crohn , Doenças Inflamatórias Intestinais , Adulto , Colite Ulcerativa/diagnóstico , Doença de Crohn/diagnóstico , Dieta , Ingestão de Alimentos , Humanos
4.
Aust Vet J ; 98(10): 486-490, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32794196

RESUMO

Encephalomyocarditis virus (EMCV) infection was detected by real-time reverse transcription PCR (qRT-PCR) in four adult alpacas (Vicugna pacos) from two properties on the Far North Coast of New South Wales (NSW) in April and May 2018 and in two adult alpacas from a third property on the Central Coast of NSW in October 2018. Viral RNA was detected in a range of samples, including blood, fresh body organs and mucosal swabs. EMCV was isolated from the blood and body organs of five of these alpacas. These animals displayed a range of clinical signs, including inappetence, colic, recumbency and death. Necropsy findings included multifocal to coalescing areas of myocardial pallor, pulmonary congestion and oedema, hepatic congestion and serosal effusion. Histopathological changes comprised acute, multifocal myocardial degeneration and necrosis, with mild, neutrophilic and lymphocytic inflammation (5/5 hearts) and mild, perivascular neutrophilic meningoencephalitis (1/3 brains). This is the first report of disease due to EMCV in alpacas under farm conditions, and it identifies EMCV infection as a differential diagnosis for acute disease and death in this camelid species. In addition to the samples traditionally preferred for EMCV isolation (fresh heart, brain and spleen), blood samples are also appropriate for EMCV detection by qRT-PCR assay.


Assuntos
Camelídeos Americanos , Infecções por Cardiovirus/epidemiologia , Infecções por Cardiovirus/veterinária , Infecções/veterinária , Animais , Vírus da Encefalomiocardite/genética , Coração , New South Wales/epidemiologia
5.
Curr Oncol ; 26(3): 167-172, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-31285661

RESUMO

Background: CervixCheck, Manitoba's cervical cancer screening program, conducted a pilot study to assess whether screening participation could be improved in unscreened women by offering a mailed self-sampling kit for human papillomavirus (hpv) testing instead of a Pap test. Methods: In a prospective cohort study design, a sample of unscreened women (n = 1052) who had been sent an invitation letter from CervixCheck in the past but who did not respond were randomized to either an intervention group or a control group. The intervention group received a mailed hpv self-sampling kit; the control group received no additional communication. Returned hpv self-sampling swabs were analyzed by a provincial laboratory. After 6 months, screening participation in the two study groups was compared using a logistic regression model adjusted for age and area of residence (urban or rural). Secondary outcomes included hpv positivity, specimen inadequacy, compliance with follow-up, and time to colposcopy. Results: Screening participation was significantly higher in the intervention group than in the control group (n = 51, 9.6%, vs. n = 13, 2.5%; odds ratio: 4.7; 95% confidence interval: 2.56 to 8.77). Geographic area of residence (urban or rural) and age were not statistically significant. Conclusions: The study demonstrated that hpv self-sampling kits can enhance screening participation in unscreened non-responder women in the setting of an organized screening program. Next steps should include additional research to determine the best implementation strategy for hpv self-sampling in Manitoba.


Assuntos
Detecção Precoce de Câncer/métodos , Programas de Rastreamento/métodos , Papillomaviridae , Infecções por Papillomavirus/diagnóstico , Neoplasias do Colo do Útero/prevenção & controle , Adulto , Idoso , Feminino , Humanos , Manitoba , Pessoa de Meia-Idade , Infecções por Papillomavirus/complicações , Neoplasias do Colo do Útero/etiologia
6.
Clin Microbiol Infect ; 24(10): 1084-1088, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-29427799

RESUMO

OBJECTIVE: To describe the epidemiology and risk factors for recurrence of severe lower leg cellulitis (LLC). METHODS: A longitudinal cohort study using state-wide data of adults presenting with recurrent LLC following a primary episode occurring between January 2002 and December 2013. The incidence of recurrent LLC was estimated using the cumulative incidence function, accounting for mortality. Independent risk factors for recurrence were identified using Fine-Gray sub-distribution and Cox proportional hazards models. RESULTS: Of 36 276 patients presenting with their first episode of LLC, 4598 had at least one recurrence during the follow-up period. The cumulative incidence of first, second, and third recurrences at 12 months since previous infection was 6.3% (95% CI 6.0-6.5), 17.2% (95% CI 16.1-18.4), and 29.4% (95% CI 26.8-31.9), respectively, and at 5 years was 13.9% (95% CI 13.5-14.3), 35.9% (95% CI 34.2-37.5), and 52.9% (95% CI 49.5-56.2), respectively. The length of hospitalization increased from 3 days for the primary episode to 4 and 5 days for first and all subsequent recurrences, respectively. Independent risk factors for recurrent LLC included age, ethnicity (Indigenous Australian), local factors relating to lower leg pathology, conditions that commonly result in peripheral oedema, and systemic conditions that may be associated with increased leg size. CONCLUSIONS: LLC recurrences are frequent, and each episode increases the likelihood of subsequent recurrence and length of hospitalization. These data provide context and scope to develop workable and effective strategies to prevent secondary episodes for all cases of primary LLC.


Assuntos
Celulite (Flegmão)/epidemiologia , Extremidade Inferior/microbiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Austrália , Feminino , Hospitalização , Humanos , Incidência , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Recidiva , Fatores de Risco , Prevenção Secundária/métodos , Adulto Jovem
7.
Clin Microbiol Infect ; 24(10): 1089-1094, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-29427797

RESUMO

OBJECTIVE: To describe the epidemiology and risk factors for primary episodes of severe lower leg cellulitis (LLC). METHODS: This was a longitudinal cohort study using state-wide data linkage of adults presenting to Western Australian (WA) hospitals with a first ever LLC from January 2002 to December 2013. The study aimed at determining risk factors, medical records from the index patient, together with comparable data from controls matched by age, sex, postcode, and month of admission. RESULTS: During the period, 36 276 patients presented with their first episode of LLC. The incidence increased by 4.7% per annum, reaching 204.8 (95% CI 198.6-211.1) per 100 000 population by December 2013. Analysis of 29 062 case-control pairs showed several conditions with lower limb pathology were independently associated with LLC, including varicose veins (AOR 2.95, 95% CI 2.50-3.48, p < 0.001), lymphoedema (AOR 2.65, 95% CI 1.71-4.10, p < 0.001), tinea pedis (AOR 3.05, 95% CI 1.45-6.42, p 0.003), and saphenous vein harvest during coronary artery bypass grafting (AOR 1.74, 95% CI 1.32-2.30, p < 0.001). Also associated with LLC was obesity (AOR 2.05, 95% CI 1.82-2.31, p < 0.001), renal disease (AOR 1.28, 95% CI 1.14-1.44, p < 0.001), rheumatologic conditions (AOR 2.12, 95% CI 1.72-2.60, p < 0.001), hemiplegia/paraplegia (AOR 1.31, 95% CI 1.13-1.52, p < 0.001), and liver disease (AOR 1.77, 95% CI 1.51-2.06, p < 0.001). CONCLUSIONS: LLC presents a major burden to the health sector and is increasing with an ageing population. Given the high rates of recurrence, long-term morbidity, and economic impact, efforts to reduce primary episodes should be incorporated into the infectious diseases and healthy ageing research agenda.


Assuntos
Celulite (Flegmão)/epidemiologia , Extremidade Inferior/microbiologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Austrália/epidemiologia , Estudos de Casos e Controles , Cuidado Periódico , Feminino , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Recidiva , Fatores de Risco
8.
J Fish Biol ; 90(4): 1479-1505, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-28000210

RESUMO

The behaviour of sexually mature Arctic charr Salvelinus alpinus specimens (fifth farm generation) was observed in captivity for four consecutive days. Only agonistic interactions between males of different size were facilitated on the first 2 days, while both agonistic and courtship interactions were possible from the third day up to the end of the experiment. The reliability of behavioural analysis was assessed in order to reduce the possibility of observer errors within the generated datasets. The behavioural investment of big males, small males and females was analysed using general linear models (two-way repeated measures ANOVAs with time and male size as factors). A peak in the agonistic interactions between males occurred during the first day of interactions, where the agonistic investment of big males was significantly higher than that of small males. This resulted in an increased investment in submissive behaviour by the small males, who consistently performed submissive behaviours from the second day of interactions up to the end of the trial. Big males were found to invest significantly more than small males in courtship behaviours for the duration of the trial. Even though females performed inter-sexual behaviours towards both big and small males for the entire observation period, female interaction rate towards big males was higher than towards small males. This study suggests that both male investment in mating behaviour and female preference might be related to male characteristics such as body length and that S. alpinus behavioural patterns and mate choice cues might be strongly context-related and characterized by high levels of behavioural plasticity (i.e. presence-absence of certain behavioural units or potential reversal of a mate choice cue) within the same species. Finally, in light of this, some conservation measures are discussed. In particular, effective management plans should take into account the high level of behavioural plasticity likely to be occurring in this species.


Assuntos
Tamanho Corporal/fisiologia , Preferência de Acasalamento Animal/fisiologia , Estações do Ano , Truta/fisiologia , Animais , Feminino , Investimentos em Saúde , Masculino , Reprodutibilidade dos Testes , Reprodução/fisiologia
9.
Eur J Clin Microbiol Infect Dis ; 35(10): 1673-7, 2016 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-27325439

RESUMO

In the context of globally increasing antimicrobial resistance, tigecycline appears to be a useful therapeutic option. The need for prolonged courses for complex infections has prompted consideration of its use via outpatient parenteral antibiotic therapy (OPAT) programmes, although clinical outcomes when used in this setting remain unknown. We retrospectively reviewed the patient characteristics and outcomes of 11 patients who received tigecycline, most commonly delivered as 100 mg once daily, via OPAT at three tertiary Australian hospitals. Rates of co-morbidity and prior antibiotic use were high. Patients had a wide range of infections including bone and/or joint (n = 5), intra-abdominal (n = 3), lower respiratory tract (n = 2) and parapharyngeal abscess (n = 1). Mycobacterial species (n = 5) were the most frequent pathogen, and multi-resistant organisms were common (n = 4). The median OPAT duration was 14 days (IQR 6-30). Nausea was encountered in 45 % of cases. At completion of OPAT, 1 patient (9 %) was cured, 2 (18 %) had improved and 8 (73 %) failed therapy. Failure occurred due to either progression or non-response of infection (n = 4), re-admission (n = 3), premature cessation of tigecycline due to nausea (n = 3) or death (n = 1). Whilst OPAT delivery of tigecycline is a therapeutic option, when used as second-line therapy for complex, often multi-resistant infections in patients with multiple comorbidities, high rates of clinical failure, readmissions and adverse effects, especially nausea, should be anticipated.


Assuntos
Assistência Ambulatorial/métodos , Antibacterianos/administração & dosagem , Infecções Bacterianas/tratamento farmacológico , Uso de Medicamentos , Minociclina/análogos & derivados , Administração Intravenosa , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Minociclina/administração & dosagem , Estudos Retrospectivos , Centros de Atenção Terciária , Tigeciclina , Resultado do Tratamento
10.
Genes Immun ; 17(1): 52-9, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26633000

RESUMO

Genetic factors are likely to contribute to low severe malaria case fatality rates in Melanesian populations, but association studies can be underpowered and may not provide plausible mechanistic explanations if significant associations are detected. In preparation for a genome-wide association study, 29 candidate single-nucleotide polymorphisms (SNPs) with minor allele frequencies >5% were examined in a case-control study of 504 Papua New Guinean children with severe malaria. In parallel, an immunological substudy was performed on convalescent peripheral blood mononuclear cells (PBMCs) from cases and controls. Following stimulation with a Toll-like receptor (TLR) 1/2 agonist, effector cytokines and chemokines were assayed. The only significant genetic association observed involved a nonsynonymous SNP (TLR1rs4833095) in the TLR1 gene. A recessive (TT) genotype was associated with reduced odds of severe malaria of 0.52 (95% confidence interval (0.29-0.90), P=0.006). Concentrations of pro-inflammatory cytokines interleukin-1ß and tumour necrosis factor α were significantly higher in severe malaria cases compared with healthy controls, but lower in children with the protective recessive (TT) genotype. A genetic variant in TLR1 may contribute to the low severe malaria case fatality rates in this region through a reduced pro-inflammatory cellular phenotype.


Assuntos
Malária Falciparum/genética , Malária Falciparum/imunologia , Receptor 1 Toll-Like/genética , Receptor 1 Toll-Like/imunologia , Estudos de Casos e Controles , Pré-Escolar , Feminino , Estudo de Associação Genômica Ampla , Humanos , Leucócitos Mononucleares/imunologia , Malária Falciparum/parasitologia , Masculino , Papua Nova Guiné , Polimorfismo de Nucleotídeo Único
11.
Brain Imaging Behav ; 10(1): 296-313, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-25972116

RESUMO

Mental time travel (MTT) entails the ability to mentally travel into autobiographical memory (AM) and episodic future thinking (EFT). While AM and EFT share common phenomenological and cerebral functional properties, distinctive characteristics have been documented in healthy and clinical populations. No report, to our knowledge, has informed on the functional underpinnings of MTT impairment in multiple sclerosis (MS) patients, hence the aim of this work. We studied 22 relapsing-remitting MS patients and 22 matched controls. Participants underwent an AM/EFT assessment using the Autobiographical Interview (Levine et al. 2002), followed by a functional MRI session. The latter consisted in AM and EFT tasks, distinguishing the construction and elaboration phases of events. The results showed impaired performance for AM and EFT in patients, accompanied by increased cerebral activations mostly located in the frontal regions, which extended to the parietal, lateral temporal and posterior regions during AM/EFT tasks, relative to healthy controls. Enhanced brain activations in MS patients were particularly evident during the EFT task and involved the hippocampus, frontal, external temporal, and cingulate regions. The construction phase required greater fronto-parieto-temporal activations in MS patients relative to both healthy controls, and the elaboration phase. Taking together, our results suggested the occurrence of cerebral activation changes in the context of MTT in MS patients, expressed by distinct and common mechanisms for AM and EFT. This study may provide new insights in terms of cerebral activation changes in brain lesion and their application to clinical settings, considering AM/EFT's central role in everyday life.


Assuntos
Encéfalo/fisiopatologia , Imaginação/fisiologia , Memória Episódica , Esclerose Múltipla Recidivante-Remitente/fisiopatologia , Pensamento/fisiologia , Adulto , Mapeamento Encefálico , Emoções/fisiologia , Feminino , Humanos , Entrevistas como Assunto , Imageamento por Ressonância Magnética , Masculino , Esclerose Múltipla Recidivante-Remitente/psicologia , Testes Neuropsicológicos , Tempo de Reação
12.
Nat Commun ; 6: 8201, 2015 Sep 14.
Artigo em Inglês | MEDLINE | ID: mdl-26365682

RESUMO

Exploration of optical properties of organic crystalline semiconductors thin films is challenging due to submicron grain sizes and the presence of numerous structural defects, disorder and grain boundaries. Here we report on the results of combined linear dichroism (LD)/ polarization-resolved photoluminescence (PL) scanning microscopy experiments that simultaneously probe the excitonic radiative recombination and the molecular ordering in solution-processed metal-free phthalocyanine crystalline thin films with macroscopic grain sizes. LD/PL images reveal the relative orientation of the singlet exciton transition dipoles at the grain boundaries and the presence of a localized electronic state that acts like a barrier for exciton diffusion across the grain boundary. We also show how this energy barrier can be entirely eliminated through the optimization of deposition parameters that results in films with large grain sizes and small-angle boundaries. These studies open an avenue for exploring the influence of long-range order on exciton diffusion and carrier transport.

14.
Neuropsychol Rehabil ; 23(2): 161-81, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-22978301

RESUMO

The multifocal nature of lesions in multiple sclerosis hints at the occurrence of autobiographical memory (AbM) impairment. However, the dearth of studies on AbM in multiple sclerosis is noticeable, notwithstanding the importance of AbM in everyday life. In the first section of this study, 25 multiple sclerosis patients and 35 controls underwent a detailed episodic AbM assessment. Results obtained by means of ANOVA suggested an AbM retrieval deficit in every patient. That pattern of performance paved the way for the second section of the study, in which we followed up 10 out of the 25 patients. Our objective was to assess the effectiveness of a cognitive facilitation programme designed to alleviate AbM retrieval deficits, based on the key role of mental visual imagery on AbM. Statistical group analyses by means of ANOVA and individual analyses using the χ(2) test showed significant differences in AbM test results, in post-facilitation relative to pre-facilitation training, in all 10 patients. Moreover, the patients' comments showed that the positive effects were transferred in their daily life functioning. We would like to suggest that the facilitation programme efficiently enhanced the process of self-centred mental visual imagery, which might have compensated for poor retrieval of personal memories by providing better access to visual details and detailed visual scenes of personal recollections.


Assuntos
Terapia Cognitivo-Comportamental/métodos , Transtornos da Memória/etiologia , Transtornos da Memória/reabilitação , Memória Episódica , Esclerose Múltipla/complicações , Adulto , Análise de Variância , Sinais (Psicologia) , Terapia por Exercício/métodos , Feminino , Seguimentos , Humanos , Masculino , Transtornos da Memória/psicologia , Pessoa de Meia-Idade , Esclerose Múltipla/psicologia , Esclerose Múltipla/reabilitação , Testes Neuropsicológicos , Escalas de Graduação Psiquiátrica , Autoimagem , Vocabulário , Adulto Jovem
15.
Artigo em Inglês | WPRIM (Pacífico Ocidental) | ID: wpr-631388

RESUMO

When cholera was first detected in Papua New Guinea (PNG) in mid-2009, national diagnostic capacity faced many challenges. This was in part due to the non-endemic status of the outbreak, resulting in few local staff experienced in Vibrio cholerae detection and poor access to the required consumables. The PNG Institute of Medical Research conducted culture on specimens from suspected cholera patients in Madang Province, with presumptive V. cholerae isolates sent to Goroka for confirmation. Of 98 samples analysed 15 were culture positive, with V. cholerae detected by polymerase chain reaction (PCR) in an additional 3 samples. Further analyses were conducted to identify other pathogenic bacteria from thiosulphate citrate bile salt sucrose (TCBS) agar. Molecular-based assays detected enteropathogenic (n = 1) and enterotoxigenic (n = 1) strains of Escherichia coli. No other major enteric pathogens were detected. The low detection rate of V. cholerae at the provincial level reflects challenges in the laboratory diagnosis of cholera and in-country challenges in responding to an outbreak of a non-endemic disease, such as lack of in-country diagnostic expertise and available consumables in the early stages. It also suggests that full aetiological investigations are warranted in future outbreaks of acute watery diarrhoea in PNG to fully elucidate the potentially complex aetiology, which could in turn guide diagnostic, treatment and prevention measures.


Assuntos
Humanos , Cólera/epidemiologia , Surtos de Doenças , Enterobacteriaceae/isolamento & purificação , Fezes/microbiologia , Imunoensaio , Papua Nova Guiné/epidemiologia , Reação em Cadeia da Polimerase , Vibrio cholerae/isolamento & purificação
16.
J Agric Food Chem ; 60(38): 9562-6, 2012 Sep 26.
Artigo em Inglês | MEDLINE | ID: mdl-22950817

RESUMO

The volatile compounds emitted from uninfested apple seedlings, cv. Royal Gala, and apple seedlings infested with generalist herbivore Epiphyas postvittana larvae were sampled using headspace collection and analyzed by gas chromatography-mass spectrometry. Nine additional compounds were only detected in infested apple seedlings [including benzyl alcohol, (E)-ß-ocimene, benzyl cyanide, indole, (E)-nerolidol, and four unidentified compounds]. Infested apple seedlings produced larger amounts of (Z)-3-hexenyl acetate, linalool, 4,8-dimethyl-1,3(E),7-nonatriene, methyl salicylate, ß-caryophyllene, germacrene D, (E,E)-α-farnesene, and (Z)-3-hexenyl benzoate than uninfested plants. Female parasitoids flew exclusively upwind to infested and not to uninfested apple seedlings in wind tunnel choice tests and preferred infested leaflets in still air, even after the removal of larvae. The attraction of a parasitoid to infested apple seedlings in the laboratory and in the field to apple and many other plants in at least six families supports considerable generality of the tritrophic signaling process.


Assuntos
Malus/metabolismo , Malus/parasitologia , Mariposas/parasitologia , Compostos Orgânicos Voláteis/análise , Acetatos/análise , Monoterpenos Acíclicos , Alcenos/análise , Animais , Comportamento Animal , Comportamento Alimentar , Feminino , Cromatografia Gasosa-Espectrometria de Massas , Himenópteros , Larva , Monoterpenos/análise , Odorantes/análise , Plântula/metabolismo , Plântula/parasitologia , Sesquiterpenos/análise , Árvores
17.
J Comp Pathol ; 146(2-3): 106-15, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22297076

RESUMO

Current understanding of capripoxvirus pathogenesis is limited since there have been no detailed studies examining cell tropism at well-defined intervals following infection. We undertook time-course studies in sheep and goats following inoculation of sheeppox or goatpox viruses in their respective homologous hosts, and examined tissues by light microscopy. A monoclonal antibody generated to a sheeppox virus core protein was used for immunohistochemical detection of viral antigen in tissue sections. Lesions and virus antigen were observed consistently in the skin, lung and lymph nodes. Antigen was detected at 6 and 8 days post inoculation for skin and lung, respectively, within cells which appeared to be of monocyte/macrophage lineage. In sheep skin capripoxvirus immunoreactivity was detected within previously unreported large multinucleated cells. In the lung, double immunolabelling detected the simultaneous expression of capripoxvirus antigen and cytokeratin indicating the presence of virus within pneumocytes. Lung double immunolabelling also detected the expression of capripoxvirus antigen in CD68(+) cells, confirming the presence of viral antigen within macrophages. Based on early detection of infected macrophages, dissemination of virus within the host and localization to tissues likely occurred through cells of the monocyte/macrophage lineage. Histological findings revealed similarities with both monkeypox and smallpox, thus capripoxvirus infection in sheep and goats may represent useful models with which to study strategies for poxvirus-specific virus vaccine concepts and therapeutics.


Assuntos
Antígenos Virais/análise , Capripoxvirus , Doenças das Cabras/virologia , Infecções por Poxviridae/veterinária , Doenças dos Ovinos/virologia , Animais , Capripoxvirus/imunologia , Doenças das Cabras/imunologia , Doenças das Cabras/patologia , Cabras , Infecções por Poxviridae/imunologia , Infecções por Poxviridae/patologia , Infecções por Poxviridae/virologia , Ovinos , Doenças dos Ovinos/imunologia , Doenças dos Ovinos/patologia
18.
Rev Neurol (Paris) ; 167(12): 868-72, 2011 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-21640366

RESUMO

In 1836, Marc Dax presented a revolutionary conclusion based on both his clinical observations and reports from the literature: the localisation of language in the left hemisphere. Twenty-seven years later, his son, Gustave Dax, extended and enriched his work. Their involvement in 19th century neuropsychology is impressive and recognition should have been considerable. However, according to the vast majority of historians of neurology, neuropsychology and aphasiology, the priority in establishing the dominance of the left brain hemisphere for speech goes to Paul Broca in an undivided way. Is it possible that Marc Dax's and his son, Gustave Dax's works were entirely unknown? Were they known and utterly forgotten? Were they ignored? How did we get to know that they existed? The aim of the present paper is to try to answer those and other questions and to demonstrate that there is abundance of data pointing out that the priority of the discovery of left hemisphere dominance for speech ought to be, at least, shared by Dax and Broca.


Assuntos
Cérebro/fisiologia , Lateralidade Funcional/fisiologia , Idioma , Neurologia/história , Cérebro/anatomia & histologia , História do Século XIX , História do Século XX , Humanos , Modelos Teóricos , Fala/fisiologia
19.
Neuropsychologia ; 49(9): 2619-29, 2011 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-21621549

RESUMO

Sleep plays a role in the consolidation of declarative memories. Although this influence has attracted much attention at the level of behavioural performance, few reports have searched for neural correlates. Here, we studied the impact of sleep upon memory for the context in which stimuli were learned at both behavioural and neural levels. Participants retrieved the association between a presented foreground object and its encoding context following a 12-h retention interval including either wake only or wake plus a night of sleep. Since sleep has been shown to selectively enhance some forms of emotional memory, we examined both neutral and emotionally valenced contexts. Behaviourally, less forgetting was observed across retention intervals containing sleep than retention intervals containing only wakefulness, and this benefit was accompanied by stronger responses in hippocampus and superior parietal cortex. This sleep-related reduction in forgetting did not differ between neutral and negative contexts, but there was a clear interaction between sleep and context valence at the functional level, with left amygdala, right parahippocampus, and other components of the episodic memory system all responding more strongly during correct memory for emotional contexts post-sleep. Connectivity between right parahippocampus and bilateral amygdala/periamygdala was also enhanced during correct post-sleep attribution of emotional contexts. Because there was no interaction between sleep and valence in terms of context memory performance these functional results may be associated with memory for details about the emotional encoding context rather than for the link between that context and the foreground object. Overall, our data show that while context memory decays less across sleep than across an equivalent period of wake, the sleep-related protection of such associations is not influenced by context emotionality in the same way as direct recollection of emotional information.


Assuntos
Hipocampo/fisiologia , Lobo Parietal/fisiologia , Retenção Psicológica/fisiologia , Sono/fisiologia , Vigília/fisiologia , Adulto , Antracenos , Aprendizagem por Associação/fisiologia , Mapeamento Encefálico , Emoções/fisiologia , Feminino , Humanos , Imageamento por Ressonância Magnética , Masculino , Valores de Referência , Adulto Jovem
20.
Rev Neurol (Paris) ; 167(3): 231-44, 2011 Mar.
Artigo em Francês | MEDLINE | ID: mdl-21159357

RESUMO

INTRODUCTION: Several studies have assessed the impact of surgery on both anterograde and remote memory in patients with temporal lobe epilepsy (TLE). The majority of results have shown an extensive memory deficit in patients after temporal resection (TL). However, few protocols have used a prospective longitudinal design. Moreover, the postoperative delays were variable from one study to the next, instead of regular monitoring to identify the potential effect of time elapsed after surgery on memory performance. In addition, some studies have not used strict inclusion criteria to establish homogeneous patient groups. Finally, the impact of surgery on memory has been often assessed by comparing memory skills between epileptic patients and healthy controls. Our aim was to examine the impact of TL on memory in patients with TLE, recruited according to clear-cut clinical criteria. Moreover, we focused on memory performance progression per se in epileptic patients pre- and postoperatively, rather than on memory performance analysis expressed as "deficient" or "normal". METHODS: We assessed 30 patients with unilateral TLE (17 right TLE and 13 left TLE) on four anterograde memory tests and six remote memory tasks. Patients completed all tests preoperatively, and 5 and 12 months after TL. RESULTS: Five months after surgery, performance was equivalent to the preoperative scores for both groups in anterograde memory tasks and remote memory tests. One year after TL, patients with right TLE showed enhanced performance in the verbal anterograde memory tests and in retrieving recent autobiographical memories. Results for left TL showed improved scores only in a recognition memory test of faces. CONCLUSIONS: In the present study, surgical patients were "double winners" gaining seizure freedom and potential of memory stability or recovery. The gain was observed only 12 months after surgery and following temporal resection lateralisation. Our data showed postoperative memory improvement in patients with temporal lobe epilepsy presenting with specific clinical characteristics.


Assuntos
Lobectomia Temporal Anterior/efeitos adversos , Epilepsia do Lobo Temporal/cirurgia , Transtornos da Memória/etiologia , Adolescente , Adulto , Amnésia Anterógrada/etiologia , Amnésia Anterógrada/psicologia , Tonsila do Cerebelo/fisiopatologia , Tonsila do Cerebelo/cirurgia , Dominância Cerebral , Epilepsia do Lobo Temporal/psicologia , Feminino , Seguimentos , Hipocampo/fisiopatologia , Hipocampo/cirurgia , Humanos , Masculino , Transtornos da Memória/psicologia , Memória de Longo Prazo , Rememoração Mental , Pessoa de Meia-Idade , Testes Neuropsicológicos , Prosopagnosia/etiologia , Prosopagnosia/psicologia , Estudos Prospectivos , Recuperação de Função Fisiológica , Fatores de Tempo , Adulto Jovem
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