Secagem da madeira de louro preto (Nectandra cuspidata) em estufa de micro-ondas

Microwave drying will play an important role in the industrialization of timber in the near future, because improved dimensional stability and increased mechanical strength of wood are dependent on its drying. The objective of this study was to evaluate the drying of Louro preto wood using the microwave process and its influence on drying time, final moisture content, and formation of checks. A program originally developed for Mahogany wood was used due to the similarity between the basic density values of the two wood species. To this end, three (3) drying processes were conducted: drying S1, with initial average moisture content above the fiber saturation point (FSP), reached 13.99% of the final average moisture content after 2h 25min; whereas drying S2 and S3, with initial average moisture contents below the FSP, showed 14.00 and 14.62% of the final average moisture content after 2h 8min and 2h 2min, respectively. The drying processes were considered fast, and the difference in the initial moisture contents of the samples showed the influence of the treatments in the formation of end and surface checks. Drying S2 was more prone to present surface checks than end checks, whereas internal checks were not found in any of the drying processes performed

Neural Correlates of Visual Motion Prediction

Predicting the trajectories of moving objects in our surroundings is important for many life scenarios, such as driving, walking, reaching, hunting and combat. We determined human subjects’ performance and task-related brain activity in a motion trajectory prediction task. The task required spatial and motion working memory as well as the ability to extrapolate motion information in time to predict future object locations. We showed that the neural circuits associated with motion prediction included frontal, parietal and insular cortex, as well as the thalamus and the visual cortex. Interestingly, deactivation of many of these regions seemed to be more closely related to task performance. The differential activity during motion prediction vs. direct observation was also correlated with task performance. The neural networks involved in our visual motion prediction task are significantly different from those that underlie visual motion memory and imagery. Our results set the stage for the examination of the effects of deficiencies in these networks, such as those caused by aging and mental disorders, on visual motion prediction and its consequences on mobility related daily activities

Stable Isotope Biogeochemistry of Seabird Guano Fertilization: Results from Growth Chamber Studies with Maize (Zea Mays)

Stable isotope analysis is being utilized with increasing regularity to examine a wide range of issues (diet, habitat use, migration) in ecology, geology, archaeology, and related disciplines. A crucial component to these studies is a thorough understanding of the range and causes of baseline isotopic variation, which is relatively poorly understood for nitrogen (δ(15)N). Animal excrement is known to impact plant δ(15)N values, but the effects of seabird guano have not been systematically studied from an agricultural or horticultural standpoint.This paper presents isotopic (δ(13)C and δ(15)N) and vital data for maize (Zea mays) fertilized with Peruvian seabird guano under controlled conditions. The level of (15)N enrichment in fertilized plants is very large, with δ(15)N values ranging between 25.5 and 44.7‰ depending on the tissue and amount of fertilizer applied; comparatively, control plant δ(15)N values ranged between -0.3 and 5.7‰. Intraplant and temporal variability in δ(15)N values were large, particularly for the guano-fertilized plants, which can be attributed to changes in the availability of guano-derived N over time, and the reliance of stored vs. absorbed N. Plant δ(13)C values were not significantly impacted by guano fertilization. High concentrations of seabird guano inhibited maize germination and maize growth. Moreover, high levels of seabird guano greatly impacted the N metabolism of the plants, resulting in significantly higher tissue N content, particularly in the stalk.The results presented in this study demonstrate the very large impact of seabird guano on maize δ(15)N values. The use of seabird guano as a fertilizer can thus be traced using stable isotope analysis in food chemistry applications (certification of organic inputs). Furthermore, the fertilization of maize with seabird guano creates an isotopic signature very similar to a high-trophic level marine resource, which must be considered when interpreting isotopic data from archaeological material

Patients’ and practice nurses’ perceptions of depression in patients with type 2 diabetes and/or coronary heart disease screened for subthreshold depression

Background Comorbid depression is common in patients with type 2 diabetes (DM2) and/or coronary heart disease (CHD) and is associated with poor quality of life and adverse health outcomes. However, little is known about patients’ and practice nurses’ (PNs) perceptions of depression. Tailoring care to these perceptions may affect depression detection and patient engagement with treatment and prevention programs. This study aimed to explore patients’ and PNs’ perceptions of depression in patients with DM2/CHD screened for subthreshold depression. Methods A qualitative study was conducted as part of a Dutch stepped-care prevention project. Using a purposive sampling strategy, data were collected through semi-structured interviews with 15 patients and 9 PNs. After consent, all interviews were recorded, transcribed verbatim and analyzed independently by two researchers with Atlas.ti.5.7.1 software. The patient and PN datasets were inspected for commonalities using a constant comparative method, from which a final thematic framework was generated. Results Main themes were: illness perception, need for care and causes of depression. Patients generally considered themselves at least mildly depressed, but perceived severity levels were not always congruent with Patient Health Questionnaire 9 scores at inclusion. Initially recognizing or naming their mental state as a (subthreshold) depression was difficult for some. Having trouble sleeping was frequently experienced as the most burdensome symptom. Most experienced a need for care; psycho-educational advice and talking therapy were preferred. Perceived symptom severity corresponded with perceived need for care, but did not necessarily match help-seeking behaviour. Main named barriers to help-seeking were experienced stigma and lack of awareness of depression and mental health care possibilities. PNs frequently perceived patients as not depressed and with minimal need for specific care except for attention. Participants pointed to a mix of causes of depression, most related to negative life events and circumstances and perceived indirect links with DM2/CHD. Conclusion Data of the interviewed patients and PNs suggest that they have different perceptions about (subthreshold) depressive illness and the need for care, although views on its causes seem to overlap more

O envolvimento do enfermeiro no processo de morrer de bebês internados em Unidade Neonatal El involucramiento del enfermero en el proceso de morir de niños hospitalizados en una unidad de neonatología Nurses experiences with death in the neonatal intensive care unit

OBJETIVO: compreender a participação do enfermeiro no processo de morrer de bebês internados em unidade de terapia intensiva neonatal. MÉTODOS: Pesquisa Qualitativa em que participaram 10 enfermeiras de uma unidade de terapia intensiva neonatológica de um hospital-escola da cidade de Fortaleza-CE, durante os meses de maio e junho de 2003. RESULTADOS: os resultados foram analisados conforme as categorias: Sentimentos que emergem na convivência com a morte; Convivendo com a família no processo de morrer; A influência da formação acadêmica para a convivência com o paciente terminal. Os sentimentos citados foram de perda, tristeza, angústia, impotência, frieza. Os profissionais se vêem envolvidos com a família que vivencia o luto. A maioria das enfermeiras não teve embasamento acerca de Tanatologia no Curso de Graduação. CONCLUSÃO: os profissionais que lidam com a morte em sua prática convivem com a busca do equilíbrio entre o cuidar do outro e de si mesmo.<br>OBJETIVO: comprender la participación del enfermero en el proceso de morir de bebés internados en una unidad de cuidados intensivos neonatal. MÉTODOS: Pesquisa Qualitativa en que participaron en el estudio 10 enfermeras de la unidad de cuidados intensivos neonatal de un hospital-docente de la ciudad de Fortaleza-CE, durante los meses de mayo a junio del 2003. RESULTADOS: los datos fueron analizados resultando las siguientes categorías: Sentimientos que emergen en la convivencia con la muerte; Conviviendo con la familia en el proceso de morir; La influencia de la formación académica para la convivencia con el paciente terminal. Los sentimientos citados fueron de pérdida, tristeza, angustia, impotencia, frialdad. Los profesionales se ven involucrados con la familia que vivencia el duelo. La mayoría de las enfermeras no tuvo base respecto a Tanatología en el Pregrado. CONCLUSIÓN: los profesionales que se enfrentan con la muerte, en su práctica, conviven con la búsqueda del equilibrio entre el cuidar del otro y de sí mismo.<br>ABSTRACT OBJECTIVE: to understand Neonatal Intensive Care nurses experiences caring for dying neonates. METHODS: this was an qualitative exploratory study. Ten Neonatal Intensive Care Unit nurses from a school-affiliated hospital in Fortaleza, Ceará participated in this study. Data were collected during May and June, 2003. RESULTS: the following categories emerged from the analysis: feelings in the presence of death; interacting with the family in the process of dying; and, educational inadequacies coping with a terminally ill neonate. The feelings expressed by the nurses included loss, sadness, misery, weakness, and detachment. The nurses also see themselves involved with the grieving family, although the majority of them reported not having enough foundational knowledge with grief and thanatology. CONCLUSION: those nurses who deal with death in the workplace, such as the Neonatal Intensive Care Unit, are trying to keep a balance between caring for others and themselves