oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 191 )

2018 ( 332 )

2017 ( 340 )

2016 ( 536 )

Custom range...

Search Results: 1 - 10 of 198434 matches for " Betty N. Amukayia "
All listed articles are free for downloading (OA Articles)
Page 1 /198434
Display every page Item
Role of Bismuth and Substrate Temperature on the Optical Properties of Some Flash Evaporated Se100-X BiX Glassy System  [PDF]
Austine A. Mulama, Julius M. Mwabora, Andrew O. Oduor, Cosmas M. Muiva, Boniface Muthoka, Betty N. Amukayia, Drinold A. Mbete
New Journal of Glass and Ceramics (NJGC) , 2015, DOI: 10.4236/njgc.2015.52003
Abstract: Chalcogenide glasses are very important in the modern technology especially selenium-based. These glasses are sensitive to electromagnetic radiation useful in the infrared optics. The study investigated the effect of substrate temperature on the as-deposited selenium-bismuth thin films in addition to bismuth content. The films were deposited by flash evaporation method. Thickness of the films was measured on a surface profiler and confirmed through calculation based on the Swanepoel method. The spectral range of study was between 200 - 3000 nm. It is found that the effect of increasing bismuth content on the as-deposited films led to increased absorption coefficient, reflectance, refractive index and extinction coefficient while transmittance and optical band gap energy decreased. On the other hand, reflectance, absorption coefficient, extinction coefficient, refractive index, real and imaginary parts of dielectric constant increased with increase in substrate temperature but transmittance and optical band gap energy decreased.
Characterization of leaf anatomy in species of Astrocaryum and Hexopetion (Arecaceae) Caracterización de la anatomía foliar de especies de Astrocaryum y Hexopetion (Arecaceae)
Betty Millán,Francis Kahn
Revista Peruana de Biología , 2011,
Abstract: Leaf anatomy of 23 species of the genus Astrocaryum and of the two species of the genus Hexopetion is described. A total of 109 characters with at least one difference between species are reported from the lamina (83), main rib (11), petiole (9) and sheath (6). An identification key to species is given based on leaf anatomy. Distribution of the characters is discussed in order to evaluate their taxonomic relevance. Se describe la anatomía foliar de 23 especies del género Astrocaryum y de las dos especies del género Hexopetion. Se identifican 109 caracteres diferenciales del limbo (83), de la nervadura principal (11) del pecíolo (9) y de la vaina (6). Se elabora una clave de identificación de las especies a partir de los caracteres anatómicos de hoja. Se discute la distribución de los caracteres en los grupos infragenéricos de Astrocaryum a partir de las especies estudiadas para evaluar su importancia taxonómica.
Astrocaryum ulei (Arecaceae) newly discovered in Peru Astrocaryum ulei (Arecaceae), nuevo registro para el Perú
Francis Kahn,Betty Millán
Revista Peruana de Biología , 2011,
Abstract: Astrocaryum ulei, previously known from Brazil and Bolivia, is here reported from Madre de Dios in Peru. Based on the new material collected it has been possible to write an amended description of this species, which is presented here. Se registra para la flora peruana a la especie Astrocaryum ulei presente en Madre de Dios, conocida antes para Brasil y Bolivia. Se presenta una descripción actualizada de la especie.
Astrocaryum (palmae) in Amazonia a preliminary treatment
Kahn, Francis,Millán, Betty
Bulletin de l'Institut Francais d'études Andines , 1992,
Abstract: ASTROCARYUM (PALMAE) EN AMAZONIE. TRAITEMENT PRéLIMINAIRE. Le genre Astrocaryum est composé de 24 espèces amazoniennes: cinq appartiennent au sous-genre Pleiogynanthus et 19 au sous-genre Monogynanthus (3 à la section Munbaca et 16 à la section Ayri). Une clé d identification est proposée, ainsi que la description de chaque espèce, complétée par de nouvelles observations et suivie de notes sur la distribution géographique, l écologie et les utilisations. Six espeses nouvelles sont décrites. ASTROCARYUM (PALMAE) EN LA AMAZONIA. TRATAMIENTO PRELIMINAR. Astrocaryum consta de 24 especies amazónicas, 5 de las cuales pertenecen al subgénero Pleiogynanthus y 19 al subgénero Monogynanthus (3 a la sección Munbaca, 16 a la sección Ayri). Se presenta una clave para diferenciar las especies, y para cada una, su descripción con nuevos datos, así como notas sobre la distribución geográfica, la ecología y los usos. Se describen seis especies nuevas. In the Amazon, Astrocaryum includes 24 species of which five belong to the subgenus Pleiogynanthus and 19 to the subgenus Monogynanthus - three in the section Munbaca and 16 in the section Ayri. A key to these 24 species is presented followed by description based on new data, and notes on their distribution, ecology and uses. Six new species are described.
Sex Differences in Energy Metabolism Need to Be Considered with Lifestyle Modifications in Humans
Betty N. Wu,Anthony J. O'Sullivan
Journal of Nutrition and Metabolism , 2011, DOI: 10.1155/2011/391809
Abstract: Women have a higher proportion of body fat compared to men. However, women consume fewer kilojoules per kilogram lean mass and burn fat more preferentially during exercise compared with men. During gestation, women store even greater amounts of fat that cannot be solely attributed to increased energy intake. These observations suggest that the relationship between kilojoules consumed and kilojoules utilised is different in men and women. The reason for these sex differences in energy metabolism is not known; however, it may relate to sex steroids, differences in insulin resistance, or metabolic effects of other hormones such as leptin. When considering lifestyle modifications, sex differences in energy metabolism should be considered. Moreover, elucidating the regulatory role of hormones in energy homeostasis is important for understanding the pathogenesis of obesity and perhaps in the future may lead to ways to reduce body fat with less energy restriction.
Palmeras usadas por los indígenas Asháninkas en la Amazonía Peruana Palms used by Ashaninka indigenous people in Peruvian Amazon
Joanna Sosnowska,Damaso Ramirez,Betty Millán
Revista Peruana de Biología , 2011,
Abstract: El presente artículo muestra el conocimiento e importancia de las palmeras en la vida de los nativos Asháninkas. Presentamos una descripción cualitativa y cuantitativa de 32 entrevistas, obtenidos durante la visita a siete comunidades nativas ubicadas en los márgenes de los ríos Perené y Tambo en el departamento Junín, Perú. Registramos 15 especies de palmeras usadas por los Asháninkas, agrupadas bajo cinco categorías de uso: alimenticio, construcción, herramienta, ornamental y medicinal. Las especies con usos más amplios son: Attalea phalerata, Bactris gasipaes, Oenocarpus bataua y Socratea exorhiza. Las partes de las palmeras más utilizadas son los frutos, principalmente gracias a su valor comestible. La cercanía de las comunidades Asháninkas del valle del Perené a ciudades, influirían en un cambio en el tipo de vida tradicional, donde las palmeras son los más importantes recursos naturales utilizados por ellos. Sin embargo, en las comunidades del valle Tambo la vida tradicional, el conocimiento y practica en el uso de las palmeras esta aún vital In this paper we present traditional knowledge and importance of palms in Ashaninka people’s life. Qualitative and quantitative description is based on 32 interviews obtained during visits in seven native communities situ- ated near by Perene and Tambo rivers in Junín department of Peru. We registered 15 species of palms used by Ashaninka people; those were classified in five categories by use: food, construction, tools, ornaments and medicaments. Species with the most diverse uses were Attalea phalerata, Bactris gasipaes, Oenocarpus bataua and Socratea exorhiza. The most useful palm parts are fruits used mainly as a food. The proximity of Asháninkas communities from Perené Valley to the cities would produce a change in the traditional way of life, where palm trees are the most important natural resources used by them. However, the traditional life, knowledge and practice in using of palms are still alive in communities of Tambo River.
Sex Differences in Energy Metabolism Need to Be Considered with Lifestyle Modifications in Humans
Betty N. Wu,Anthony J. O'Sullivan
Journal of Nutrition and Metabolism , 2011, DOI: 10.1155/2011/391809
Abstract: Women have a higher proportion of body fat compared to men. However, women consume fewer kilojoules per kilogram lean mass and burn fat more preferentially during exercise compared with men. During gestation, women store even greater amounts of fat that cannot be solely attributed to increased energy intake. These observations suggest that the relationship between kilojoules consumed and kilojoules utilised is different in men and women. The reason for these sex differences in energy metabolism is not known; however, it may relate to sex steroids, differences in insulin resistance, or metabolic effects of other hormones such as leptin. When considering lifestyle modifications, sex differences in energy metabolism should be considered. Moreover, elucidating the regulatory role of hormones in energy homeostasis is important for understanding the pathogenesis of obesity and perhaps in the future may lead to ways to reduce body fat with less energy restriction. 1. Introduction Fat gain is always considered to be a result of long-term positive energy balance, whereby daily energy intake exceeds expenditure. From the onset of puberty to menopause, women maintain a greater percentage body fat mass (FM) than men despite smaller energy intake per kg lean mass [1] and preferential use of fat as a fuel during exercise compared to men [2]. A potential reason for these findings is that the greater FM in women relates to more efficient fat storage during nonexercising periods, especially postprandial periods [3]. During pregnancy, women deposit between 2.4 to 5.9?kg of body fat, even when undernourished [4]. In well-nourished women, the energy cost of gestation is approximately 370?MJ [5]. How this energy requirement is met is not explained purely by an increase in energy consumption, as past studies failed to demonstrate this in the first half of pregnancy [6, 7]. The reproductive years and gestation are characterised by elevated levels of ovarian hormones. Evidence indicates that oestrogens contribute to the gender differences in FM and the gestational changes in body composition [3]. Human and animal studies have explored possible mechanisms of action by these hormones [8, 9]. When considering lifestyle modifications, the sex difference in energy metabolism needs to be considered. The first half of this paper focuses on differences between men and women: the gender differences in FM are outlined, aspects of energy metabolism that may account for these differences are discussed, and the key metabolic roles of ovarian hormones are discussed. Against this backdrop,
Anatomy and physicochemical properties of the chambira fiber Anatomía y propiedades físico-químicas de la fibra de chambira
Manuel Marín,Betty Millán,Francis Kahn
Revista Peruana de Biología , 2012,
Abstract: The anatomy of the unopened spear leaf of the chambira palm (Astrocaryum chambira), from which chambira fiber is extracted, is described and compared with that of three species (Astrocaryum jauari, occasionally used for fiber extraction, A. standleyanum and A. perangustatum, which do not provide any fiber). Chambira fiber consists of non-vascular fiber strands closely adhered to the adaxial hypodermis; this forms a compact unit, which makes it easy to separate from the rest of the lamina. A similar arrangement is found in Astrocaryum jauari; however, the non-vascular fiber cells are shorter and fewer per strand. Differences in leaf anatomy of Astrocaryum standleyanum and A. perangustatum may explain why fiber is not extracted: Astrocaryum standleyanum has a dense row of non-vascular fibrous strands under the adaxial hypodermis similar to Astrocaryum chambira but the large size of non-vascular fibrous strands that are located in the abaxial part of the mesophyll makes it difficult to properly extract fiber as is done with chambira. In Astrocaryum perangustatum, non-vascular fiber strands are small and irregularly dispersed in the mesophyll, which makes it impossible to extract quality fibers. Density, thickness and tensile strength are higher in chambira fiber than in jauari fiber. Chambira fiber presents a very high cellulose content (93.9%), while lignin content is low (4.2%). The ultrastructure of the cell wall of the non-vascular fiber is described for Astrocaryum chambira only. The major trait is a three-layered cell wall, with a notably thick inner layer. The physicochemical properties of chambira fiber are compared with other vegetal fibers used by the industry. Se describe la anatomía de la lamina de la pinna en hojas no abiertas de la palmera chambira (Astrocaryum chambira), la que se utiliza para extraer la fibra, comparándola con otras tres especies (Astrocaryum jauari, de la cual ocasionalmente se obtiene una fibra, A. standleyanum y A. perangustatum, estas no proveen fibras). La estructura de la fibra consiste en paquetes de fibras no vasculares adheridos a la hipodermis y epidermis adaxial, lo cuales forman una unidad compacta, que se hace fácil separar del resto de la lámina. Una disposición similar se encuentra en la fibra de Astrocaryum jauari; sin embargo, esta especie tiene menos fibras celulares no vasculares por paquete, con menor longitud. Una disposición diferente es hallada en las otras dos especies lo cual no permite una separación de las fibras: en Astrocaryum standleyanum los paquetes de fibras no vasculares son localizados deba
Images about childhood according to Peruvian mothers Imágenes de la ni ez desde la perspectiva de las madres peruanas
Magaly Nóblega,Cecilia Thorne,Betty Pe?a,Paula Moreyra
Revista de Psicología , 2009,
Abstract: This study explores the images that Peruvian mothers of middle and low socioeconomic status hold about childhood. Participants included 91 mothers from four Peruvian cities and information was collected through focus groups. Results show that childhood is seen as a developmental period with its own characteristics and as a period of play and absence of responsibilities. Mothers acknowledge the importance of the affective dimension fordevelopment and perceive the child as an active participant in his surroundings, with cognitive and social capacities. These results reveal a positive view on childhood images in contrast with previous conceptualizations. Este estudio explora las imágenes sobre la ni ez que tienen las madres peruanas de nivel socioeconómico medio y bajo. Se trabajó con 91 madres de cuatro ciudades del Perú mediante grupos focales. Los resultados muestran que la ni ez es considerada como un período del desarrollo con características propias, y como una etapa de juego y sin responsabilidades. Las madres reconocen la dimensión afectiva como importante para el desarrollo y contemplanal ni o como un ser activo en relación a su entorno, con habilidades cognitivas y sociales.Estos resultados evidencian una evolución positiva de la imagen del ni o en comparación con conceptualizaciones pasadas.
Neotypification of Ceroxylon weberbaueri Burret Neotipificación de Ceroxylon weberbaueri Burret
Jean-Christophe Pintaud,Betty Millán,Francis Kahn
Revista Peruana de Biología , 2011,
Abstract: Ceroxylon weberbaueri Burret, a poorly known species, is recollected from its type locality. An amended des- cription is provided and the species is neotypified. Ceroxylon weberbaueri Burret, una especie poco conocida, ha sido recolectada en su localidad tipo. Se provee una descripción morfológica actualizada, y una neotipificación.
Page 1 /198434
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.