8,865 research outputs found
Pragas da soja (Glycine max) em Itaubal do Piririm, AP.
No full textNos últimos anos o cultivo da soja (Glycine max) tem sido expandido em áreas de cerrado no Estado do Amapá, alcançando aproximadamente 14.000 ha de área cultivada em 2016. Entre os desafios que os produtores de soja enfrentam, está o estabelecimento do Manejo Integrado de Pragas (MIP). Porém, inicialmente é necessário identificar as pragas que ocorrem nas lavouras locais. Assim, o objetivo desse estudo foi identificar as principais pragas da cultura de soja no Município de Itaubal do Piririm, AP. A área amostral foi delimitada às margens da Rodovia AP-70, área característica de cerrado. Foram visitadas cinco propriedades (>200 ha) que cultivam soja há pelo menos cinco anos. Em cada propriedade, plantas foram inspecionadas aleatoriamente à procura de pragas e danos por ela causados. Insetos imaturos e adultos foram coletados e levados ao Laboratório de Proteção de Plantas da Embrapa Amapá, para identificação. Os resultados das inspeções foram enriquecidos com observações já realizadas pela equipe de pesquisadores. A principal praga que ocorre no cultivo da soja na área amostrada é a lagarta-falsa-medideira [Chrysodeixis includens (Walker) (Lepidoptera: Noctuidae), de ocorrência generalizada nas áreas, causando desfolha de até 40% nas plantas mais atacadas. A mosca-branca [Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae)] tem sido uma grande preocupação, devido à sua a alta abundância populacional e à possibilidade de ser vetora de vírus fitopatogênicos. Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) foi motivo de grande preocupação nas safras de 2013 e 2014, sendo pouco frequente nas safras seguintes. O percevejo-marrom [Euschistus heros (Fabricius) (Hemiptera: Pentatomidae)] tem ocorrência frequente, embora danos significativos não terem sido observados. Sugere-se aos produtores a adoção de medidas de manejo integrado em área-ampla, evitando a dispersão dessas pragas para áreas ainda não infestadas
Obtenção de hifomicetos entomopatogênicos a partir de solo de pomares de goiabeira (Psidium guajava L.) no município de Mazagão, AP.
No full textEm virtude dos problemas reconhecidamente associados à utilização de inseticidas químicos para o controle de pragas agrícolas, o desenvolvimento de alternativas a essa prática necessita ser considerada, especialmente se o programa de controle estiver inserido em regiões onde. necessariamente, deve-se garantir o equilíbrio do agroecossistema. Nesse contexto, o emprego de agentes fúngicos de controle biológico, como Metarhizium anisopliae e Beauveria bassiana, pode contribuir significativamente, tendo em vista sua comprovada eficácia de controle, facilidade de produção massal em diversos substratos, ampla adaptação a variadas condições ambientais e, praticamente nenhum efeito deletério sobre o ambiente natural. Dessa maneira, o presente trabalho teve por objetivo isolar e caracterizar morfologicamente hifomicetos entomopatogênicos a partir de solo de pomar de goiabeira no município de Mazagão, AP, os quais, posteriormente, serão avaliados quanto à efetividade no controle de imaturos de moscas-das-frutas no Estado do Amapá. O isolamento foi realizado utilizando-se o meio semi-seletivo desenvolvido por Chase et aI. (1986), o qual possibilitou, nas dosagens utilizadas, a recuperação das espécies B. bassiana e M. anisopliae, especialmente. Os isolados de entomopatógenos obtidos foram purificados por meio da técnica de cultura monospórica e, posteriormente, tiveram sua caracterização cultural e morfológica realizada com base no meio de cultura extrato de malte 2%. Em relação aos isolados do gênero Metarhizium, todos são pertencentes a espécie M. anisopliae var. anisopliae. Após caracterização, os isolados foram multiplicados e preservados em frascos de vidro contendo água destilada estéril. Atualmente, os isolados obtidos estão sendo multiplicados e formulados para a realização de testes de patogenicidade contra imaturos da espécie de mosca-das-frutas Anastrepha striata
The Treatment of Ties in AP Correlation
No full textThe Kendall tau and AP correlation coefficients are very commonly use to compare two rankings over the same set of items. Even though Kendall tau was originally defined assuming that there are no ties in the rankings, two alternative versions were soon developed to account for ties in two different scenarios: measure the accuracy of an observer with respect to a true and objective ranking, and measure the agreement between two observers in the absence of a true ranking. These two variants prove useful in cases where ties are possible in either ranking, and may indeed result in very different scores. AP correlation was devised to incorporate a top-heaviness component into Kendall tau, penalizing more heavily if differences occur between items at the top of the rankings, making it a very compelling coefficient in Information Retrieval settings. However, the treatment of ties in AP correlation remains an open problem. In this paper we fill this gap, providing closed analytical formulations of AP correlation under the two scenarios of ties contemplated in Kendall tau. In addition,we developed an R package that implements these coefficients.Best Short Paper Accepted author manuscriptMultimedia ComputingWeb Information System
Delamination Analysis of A Class of AP-PLY Composite Laminates
No full textA recently developed fiber placement architecture, AP-PLY, has been shown to give significantly improved damage tolerance characteristics of composite structures. The behavior of delaminations resulting from low speed impact damage is of particular concern. Major attention has been paid to expand current knowledge on the delamination response of simple AP-PLY composite structure and move towards in-depth understanding of the failure mechanisms behind the damage tolerance. This thesis presents the approaches to predict delamination onset and analyze delamination growth, in support of the search of the optimum woven pattern for AP-PLY composite laminates. The recovered interlaminar stress between layers combined with the maximum stress criterion determined the delamination onset of simple AP-PLY composite laminate under out-of-plane loads. 2D finite element models with cohesive elements inserted in the interfaces of woven layers have been built to evaluate the delamination initiation and propagation in the different woven patterns of simple AP-PLY composite beams. The parameters of the woven pattern, such as the woven angle, the number of woven plies, the number of straight filled plies, and the location of the woven patterns in through the thickness direction, were investigated and shown to have a significant effect on delamination creation and growth. An energy method based on beam theory was proposed to analyze the strain energy release rate (SERR) of an existing crack in an AP-PLY beam structure. The developed analytical method was implemented in isotropic materials and the obtained SERR of a crack was validated by reference results and finite element solutions. The general behavior of crack growth on the left or right crack tip was evaluated and basic trends leading to crack propagation on one side of the crack were established. A correction factor was introduced to improve the accuracy of the SERR of a small crack through the numerical calculation. The singularity of crack tip caused by dissimilar materials was investigated and was found that the inclusion of the singularity effect could increase the accuracy for small cracks. It has been shown that the neutral axis needs to be relocated to decouple the bending and membrane behavior of unsymmetrical composite laminates, thus to meet the requirement of minimizing the strain energy of the delaminated beam to calculate the SERR of a delaminated composite beam. The calculated SERR of a crack in a composite beam has been verified by comparing with a finite element model. The woven plies in AP-PLY composite laminate altered the layup and two conventional laminates with different stacking sequences were identified in an AP-PLY composite laminate based on the assumption that the resin areas were ignored. A step by step approach was developed to obtain the SERR of a crack that goes across different materials. The analytical SERR determined when two materials are used in sequence, sets the stage for optimization of AP-PLY composite laminates without taking account of the effect of the resin area. The procedure of optimization of simple AP-PLY pattern was proposed and industry may benefit for many applications. An equivalent stiffness approach was used to model regions containing resin pockets and straight or inclined composite layers. A series of three point bending tests was carried out where the failure process and loading capacity were evaluated. The methodology, procedure of optimization, philosophy outlined in this thesis might also be applied to the more complicated fully woven AP-PLY composite laminates. The work in this thesis contributes to the understanding of the behavior of AP-PLY composite laminates with delaminations
Caracterização de dois cDNAs homológos e uma AP endonuclease em cana-de-açúcar
No full textThe genome of all organisms is subject to injuries that can be caused by endogenous and environmental factors. If these lesions are not corrected, it can be fixed generating a mutation which can be lethal to the organisms. In order to prevent this, there are different DNA repair mechanisms. These mechanisms are well known in bacteria, yeast, human, but not in plants. Two plant models Oriza sativa and Arabidopsis thaliana had the genome sequenced and due
to this some DNA repair genes have been characterized. The aim of this work is to characterized two sugarcane cDNAs that had homology to AP endonuclease: scARP1 and
scARP3. In silico has been done with these two sequences and other from plants. It has been observed domain conservation on these sequences, but the cystein at 65 position that is a characteristic from the redox domain in APE1 protein was not so conservated in plants. Phylogenetic relationship showed two branches, one branch with dicots and monocots sequence and the other branch with only monocots sequences. Another approach in order to
characterized these two cDNAs was to construct overexpression cassettes (sense and antisense orientation) using the 35S promoter. After that, these cassettes were transferred to the binary vector pPZP211. Furthermore, previously in the laboratory was obtained a plant from
nicotiana tabacum containing the overexpression cassette in anti-sense orientation. It has been observed that this plant had a slow development and problems in setting seeds. After
some manual crossing, some seeds were obtained (T2) and it was analyzed the T2 segregation. The third approach used in this work was to clone the promoter region from these
two cDNAs by PCR walking. The sequences obtained were analyzed using the program PLANTCARE. It was observed in these sequences some motives that may be related to
oxidative stress responseCoordenação de Aperfeiçoamento de Pessoal de Nível SuperiorO genoma de todos os organismos está sujeitos a lesões que podem ser causados por fatores endógenos e ambientais. Uma vez no genoma, as lesões podem levar a formação e acúmulo de mutações, as quais podem ser prejudiciais ao desenvolvimento do organismo. As vias de reparo de DNA são um mecanismo que permite o organismo detectar e corrigir essas lesões ou minimizar seus efeitos. Várias vias de reparo de DNA são conhecidas e bem caracterizadas em animais e microorganismos. Em plantas, as vias de reparo ainda não são bem caracterizadas, mas muitas pesquisas têm revelado a participação de todas as vias conhecidas no reparo do genoma das plantas, sendo os modelos mais estudados Arabidopsis thaliana e Oriza sativa. A via de reparo de interesse deste trabalho é a via de BER, a qual apresenta várias proteínas atuando no reparo do DNA. Porém, a classe de proteínas da via BER focadas são as AP endonucleases, responsáveis pela hidrólise do sítio AP. Este trabalho teve como objetivo caracterizar dois cDNAs de cana-de-açúcar: scARP1 e scARP3, homólogos a AP endonucleases de A.thaliana e identificados num trabalho de data-mining do projeto SUCEST. Para tanto, foram construídos cassetes de super-expressão, contendo o cDNA scARP1 sob o controle do promotor forte 35S. Além disso, anteriormente no laboratório foi obtido uma planta de icotiana tabacum contendo o cassete de super-expressão (35S+scARP1) em orientação anti-senso. Foi analisado o desenvolvimento desta planta, e foram obtidas também algumas sementes (T2) desta planta. Estas sementes foram germinadas e analisadas quanto à presença do cassete de super-expressão e desenvolvimento. Além disso, para estes dois genes foram clonados as regiões promotoras por PCR walking. Os fragmentos obtidos foram clonados, sequenciados e, analisados por meio do programa PLANTCARE. Os motivos encontrados nessas regiões dos genes de cana-de-açúcar foram comparados com potenciais regiões promotoras das plantas de Arabidopis, O. sativa e S. bicolor. Estas análises mostraram a presença de diferentes motivos relacionados à respostas ao estresse oxidativ
Structure function analysis of blazars AP Librae and 3c279
No full textHighest Honors in AstronomyBlazars AP Librae and 3c279 are analyzed for microvariability using a technique known as structure function analysis. AP Librae was observed in April
of 2005 and 3c279 was observed in April of 2007. The data for AP Librae was
previously reduced by Andrew Collazzi and the author reduced the data for
3c279. Both sets of data were reduced using Robert Knop's data reduction
program.
The author ran structure function analysis on both sets of data. Structure function analysis is a statistical analysis run on data that is suppose to
nd timescales of variability, periodicity, and the noise type of data. Previous analysis of AP Librae confirmed mircrovariability, which also shows up in
the structure function of AP Librae. Blazar 3c279 was much quieter than AP
Librae and showed no microvariability durning any of the nights.College of Arts and ScienceDepartment of Physics and Astronom
AP-based wireless intrusion detection systems
No full textThis thesis was scanned from the print manuscript for digital preservation and is copyright the author.
Researchers can access this thesis by asking their local university, institution or public library to
make a request on their behalf. Monash staff and postgraduate students can use the link in the References field
Environmental toxicity, redox signaling and lung inflammation:the role of glutathione
No full textGlutathione (gamma-glutamyl-cysteinyl-glycine, GSH) is the most abundant intracellular antioxidant thiol and is central to redox defense during oxidative stress. GSH metabolism is tightly regulated and has been implicated in redox signaling and also in protection against environmental oxidant-mediated injury. Changes in the ratio of the reduced and disulfide form (GSH/GSSG) can affect signaling pathways that participate in a broad array of physiological responses from cell proliferation, autophagy and apoptosis to gene expression that involve H(2)O(2) as a second messenger. Oxidative stress due to oxidant/antioxidant imbalance and also due to environmental oxidants is an important component during inflammation and respiratory diseases such as chronic obstructive pulmonary disease, idiopathic pulmonary fibrosis, acute respiratory distress syndrome, and asthma. It is known to activate multiple stress kinase pathways and redox-sensitive transcription factors such as Nrf2, NF-kappaB and AP-1, which differentially regulate the genes for pro-inflammatory cytokines as well as the protective antioxidant genes. Understanding the regulatory mechanisms for the induction of antioxidants, such as GSH, versus pro-inflammatory mediators at sites of oxidant-directed injuries may allow for the development of novel therapies which will allow pharmacological manipulation of GSH synthesis during inflammation and oxidative injury. This article features the current knowledge about the role of GSH in redox signaling, GSH biosynthesis and particularly the regulation of transcription factor Nrf2 by GSH and downstream signaling during oxidative stress and inflammation in various pulmonary diseases. We also discussed the current therapeutic clinical trials using GSH and other thiol compounds, such as N-acetyl-l-cysteine, fudosteine, carbocysteine, erdosteine in environment-induced airways disease
La integración productiva América Latina-Asia Pacífico y sus desafíos
No full textEsta publicación integra la Mesa de trabajo III: La integración productiva América Latina-Asia Pacífico y los efectos del proteccionismo.Bibliografía: p. 144.José E. Durán Lima
OPTIMALISASI SISTEM PSAP PADA AP UNTUK MENINGKATKAN AKUNTABILITAS HOTEL THE ST. REGIS BALI
No full textDi era modern, akuntabilitas dan transparansi keuangan menjadi aspek krusial bagi hotel berkelas seperti The St. Regis Bali. Hotel The St. Regis Bali, sebagai hotel bintang lima bergengsi, dihadapkan pada tuntutan akuntabilitas dan transparansi keuangan yang tinggi. Sistem PSAP, platform manajemen hotel yang digunakan, memiliki potensi besar untuk meningkatkan akuntabilitas melalui optimalisasi penggunaannya pada proses akuntansi dan pengadaan (AP). Sistem PSAP, platform manajemen hotel yang digunakan, memiliki potensi besar untuk meningkatkan akuntabilitas melalui optimalisasi penggunaannya pada proses akuntansi dan pengadaan (AP). Hotel The St. Regis Bali, sebagai hotel bintang lima bergengsi, dihadapkan pada tuntutan akuntabilitas dan transparansi keuangan yang tinggi. Sistem PSAP, platform manajemen hotel yang digunakan, memiliki potensi besar untuk meningkatkan akuntabilitas melalui optimalisasi penggunaannya pada proses akuntansi dan pengadaan (AP). Sistem PSAP merupakan platform manajemen hotel yang digunakan oleh The St. Regis Bali untuk mengelola berbagai aspek operasional hotel, termasuk proses akuntansi dan pengadaan (AP). Optimalisasi penggunaan sistem PSAP pada AP dapat membantu hotel meningkatkan akuntabilitas dan transparansi keuangan. Adapun urgensi atau rumusan masalah terkait pengabdian ini adalah apakah optimalisasi pengunaan system PSAP pada section Account Payable (AP) dapat meningkatkan akuntabilitas di hotel. Tujuan dari pengabdian ini adalah untuk mencari tahu apakah optimalisasi pengunaan system PSAP pada section Account Payable (AP) dapat meningkatkan akuntabilitas di hotel
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