1,720,955 research outputs found
Asociación de Phlebopus sp. con especies forestales del arbolado urbano de Asunción, Paraguay
No full textParaguay an ecosystems are home to a great diversity of organisms in urban trees that include fungus-plant interactions, commonly called mycorrhizae. These mycorrhizaes present a number of subterranean hyphae that are difficult to visually appreciate and basidiocarps that grow together with certain forest species. Therefore, the objective of this research was to identify mycorrhizal associations between macrofungi and forest species that interact with each other in the urban trees of Asunción, Paraguay. For this, two squares (De las Américas and Infante Rivarola) and the Carlos Antonio López Park were selected as reference points. A tour was carried out to identify the floristic composition of urban trees in the aforementioned green spaces, and the observation of the existence of microrhizal fungi. The fruiting bodies of the macrofungi found were collected and taken to the Biology Laboratory of the Faculty of Agrarian Sciences of the National University of Asunción, they were dried for microscopic observation and identification. The forest species were identified using taxonomic keys, taking into account the size of the tree, the stem, the wood, the bark and the leaves. Three specimens of macrofungi of the genus Phlebopus were found associated with the trees of the Bignoniaceae and Fabaceae families in Asuncion green spaces. Two native forest species Handroanthus heptaphyllus (Vell.) Mattos, Jacaranda mimosifolia D. Don and one exotic Bauhinia variegata L. associated with the fungus Phlebopus sp.Os ecossistemas paraguaios abrigam uma grande diversidade de organismos em árvores urbanas que incluem interações fungo-planta, comumente chamadas de micorrizas. Estas micorrizas apresentam uma série de hifas subterrâneas de difícil apreciação visual e basidiocarpos que crescem junto com certas espécies florestais. Portanto, o objetivo desta pesquisa foi identificar associações micorrízicas entre macrofungos e espécies florestais que interagem entre si nas árvores urbanas de Assunção, Paraguai. Para isso, duas praças (De las Américas e Infante Rivarola) e o Parque Carlos Antonio López foram selecionados como pontos de referência. Foi realizado um passeio para identificar a composição florística da arborização urbana nos referidos espaços verdes, e a observação da existência de fungos microrrizais. Os corpos de frutificação dos macrofungos encontrados foram coletados e levados ao Laboratório de Biologia da Faculdade de Ciências Agrárias da Universidade Nacional de Assunção, onde foram secos para observação microscópica e identificação. As espécies florestais foram identificadas por meio de chaves taxonômicas, levando em consideração o tamanho da árvore, o caule, a madeira, a casca e as folhas. Três espécimes de macrofungos do gênero Phlebopus foram encontrados associados às árvores das famílias Bignoniaceae e Fabaceae em espaços verdes de Assunção. Duas espécies florestais nativas Handroanthus heptaphyllus (Vell.) Mattos, Jacaranda mimosifolia D. Don e uma exótica Bauhinia variegata L. com associação do fungo Phlebopus sp.Los ecosistemas paraguayos albergan una gran diversidad de organismos en el arbolado urbano que incluyen las interacciones hongo-planta, comúnmente llamadas micorrizas. Estas micorrizas presentan una cantidad de hifas subterráneas de difícil apreciación visual y basidiocarpos que crecen junto a ciertas especies forestales. Por ello, el objetivo de esta investigación fue identificar asociaciones micorrízicas entre macrohongos y especies forestales que interactúan entre de sí en el arbolado urbano de Asunción, Paraguay. Para ello, fueron seleccionados como puntos de referencia dos plazas (De las Américas e Infante Rivarola) y el Parque Carlos Antonio López. Se realizó un recorrido para la identificación de la composición florística del arbolado urbano en los mencionados espacios verdes, y la observación de la existencia de hongos microrrízicos. Los cuerpos fructíferos de los macrohongos encontrados fueron recolectados y llevados al Laboratorio de Biología de la Facultad de Ciencias Agrarias de la Universidad Nacional de Asunción, se procedió al secado de estos para su observación microscópica e identificación. Las especies forestales fueron identificadas mediante las claves taxonómicas teniendo en cuenta el porte del árbol, el fuste, la madera, la corteza y las hojas. Tres ejemplares de macrohongos del género Phlebopus fueron encontrados asociados a los árboles de las familias Bignoniaceae y Fabaceae en los espacios verdes asuncenos. Se identificaron dos especies forestales nativas Handroanthus heptaphyllus (Vell.) Mattos, Jacaranda mimosifolia D. Don y una exótica Bauhinia variegata L. con asociación del hongo Phlebopus sp
Arbolado urbano de la zona metropolitana de Asunción (Paraguay) y hongos descomponedores asociados
No full textLa madera puede presentar una riqueza de organismos que puedan asociarse a la pudrición, específicamente organismos fúngicos del Phylum Basidiomycota. Este trabajo tuvo la finalidad de identificar cuáles son los principales géneros de hongos descomponedores de la madera que afectan a las diversas especies forestales en el Área Metropolitana de Asunción, en los lugares: Paseo Central de la Avenida Mariscal López, el Parque Carlos Antonio López, las Plazas de Las Américas, Infante Rivarola, Plaza Italia y Uruguaya, de la ciudad de Asunción, Paraguay, teniendo en cuenta la diversidad arbórea urbana. Se realizó un inventario forestal procediendo a la identificación de los árboles que se encuentran en el área de estudio. Se realizó la colecta y caracterización histológica de los hongos que afectan a los árboles inventariados para que fueran identificados a nivel de género. Las especies forestales de mayor abundancia registradas fueron las pertenecientes a la familia Fabaceae. Las especies de hongos descomponedores de la madera encontrados son: Ganoderma australe, Ganoderma sp., Fomitiporia sp. y Hydnopolyporus fimbriatus.Wood might have a richness of organisms that can be associated with rot, specifically fungal organisms of the Phylum Basidiomycota. The purpose of this work was to identify the main types of wood decomposing fungi that affect the various forest species in the Metropolitan Area of Asunción, in the following places: Paseo Central de Avenida Mariscal López, Parque Carlos Antonio López, the Plazas de Las Américas, Infante Rivarola, Plaza Italia and Uruguaya, in the city of Asunción, Paraguay, taking into account the urban tree diversity. A forest inventory was carried out, proceeding to the identification of the trees found in the study area. The collection and histological characterization of the fungi that affect the inventoried trees were carried out so that they were identified at the genus level. The most abundant forest species recorded were those belonging to the Fabaceae family. The species of wood decomposing fungi found are: Ganoderma australe, Ganoderma sp., Fomitiporia sp. and Hydnopolyporus fimbriatus
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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