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A REVIEW ON SISAL FIBER REINFORCED POLYMER COMPOSITES AGRIAMBI
Joseph,Kuruvilla; Tolêdo Filho,Romildo Dias; James,Beena; Thomas,Sabu; Carvalho,Laura Hecker de.
ABSTRACT The global demand for wood as a building material is steadily growing, while the availability of this natural resource is diminishing. This situation has led to the development of alternative materials. Of the various synthetic materials that have been explored and advocated, polymer composites claim a major participation as building materials. There has been a growing interest in utilizing natural fibres as reinforcement in polymer composite for making low cost construction materials in recent years. Natural fibres are prospective reinforcing materials and their use until now has been more traditional than technical. They have long served many useful purposes but the application of the material technology for the utilization of natural fibres as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sisal fibre; Polymer; Composites; Structure; Properties.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43661999000300367
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A structural perspective on the mechanisms of quorum sensing activation in bacteria Anais da ABC (AABC)
LIXA,CAROLINA; MUJO,AMANDA; ANOBOM,CRISTIANE D.; PINHEIRO,ANDERSON S..
Bacteria are able to synchronize the population behavior in order to regulate gene expression through a cell-to-cell communication mechanism called quorum sensing. This phenomenon involves the production, detection and the response to extracellular signaling molecules named autoinducers, which directly or indirectly regulate gene expression in a cell density-dependent manner. Quorum sensing may control a wide range of biological processes in bacteria, such as bioluminescence, virulence factor production, biofilm formation and antibiotic resistance. The autoinducers are recognized by specific receptors that can either be membrane-bound histidine kinase receptors, which work by activating cognate cytoplasmic response regulators, or cytoplasmic receptors...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autoinducer; Bacteria; Quorum sensing; Receptor; Structure.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502189
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A supramolecular proposal of lignin structure and its relation with the wood properties Anais da ABC (AABC)
Abreu,Heber S.; Latorraca,João V.F.; Pereira,Regina P.W.; Monteiro,Maria Beatriz O.; Abreu,Fábio A.; Amparado,Kelysson F..
In spite of the great importance of cellulose the lignin is considered the second most abundant substance of the wood. However, little attention has been given it, mainly to wood properties. The lignin as well as other structural compounds (cellulose and hemicelluloses), has obviously an important role on the wood properties, probably due its composition and existent bonds. In general lignins have β-O-4 (Alkyl Aril Ether) as majoritary bond. This bond in a continued structure form big molecules with spiral conformation as virtual model. Based on this idea, lignins that have high/low β-O-4 content may have differentiated spiraled structures,suggesting different behaviors on the wood properties,which shows that the lignins (Guaicyl:Syringyl (GS)) of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lignin; Molecular conformation; Wood properties; Structure.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100014
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Acetylcholine and bradykinin enhance hypotension and affect the function of remodeled conduit arteries in SHR and SHR treated with nitric oxide donors BJMBR
Gerová,M.; Kristek,F.; Cacányiová,S.; Cebová,M..
Discrepancy was found between enhanced hypotension and attenuated relaxation of conduit arteries in response to acetylcholine (ACh) and bradykinin (BK) in nitric oxide (NO)-deficient hypertension. The question is whether a similar phenomenon occurs in spontaneously hypertensive rats (SHR) with a different pathogenesis. Wistar rats, SHR, and SHR treated with NO donors [molsidomine (50 mg/kg) or pentaerythritol tetranitrate (100 mg/kg), twice a day, by gavage] were studied. After 6 weeks of treatment systolic blood pressure (BP) was increased significantly in experimental groups. Under anesthesia, the carotid artery was cannulated for BP recording and the jugular vein for drug administration. The iliac artery was used for in vitro studies and determination...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hypertension; Conduit iliac artery; Resistance arteries; Molsidomine; Pentaerythritol tetranitrate; Iliac artery; Structure.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000600019
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Alternative oxidase in the branched mitochondrial respiratory network: an overview on structure, function, regulation, and role BJMBR
Sluse,F.E.; Jarmuszkiewicz,W..
Plants and some other organisms including protists possess a complex branched respiratory network in their mitochondria. Some pathways of this network are not energy-conserving and allow sites of energy conservation to be bypassed, leading to a decrease of the energy yield in the cells. It is a challenge to understand the regulation of the partitioning of electrons between the various energy-dissipating and -conserving pathways. This review is focused on the oxidase side of the respiratory chain that presents a cyanide-resistant energy-dissipating alternative oxidase (AOX) besides the cytochrome pathway. The known structural properties of AOX are described including transmembrane topology, dimerization, and active sites. Regulation of the alternative...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mitochondria; Alternative oxidase; Structure; Regulation; Electron partitioning.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000600003
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Análise da estrutura de fragmentos florestais no Planalto Paulistano - SP Rev. Bras. Bot.
DISLICH,RICARDO; CERSÓSIMO,LUCIANA; MANTOVANI,WALDIR.
Neste trabalho é descrita a variação encontrada na estrutura de fragmentos florestais no Planalto Paulistano, sob diversos aspectos e em diferentes escalas de tamanho. Um censo do componente arbóreo dominante (PAP > ou = 50 cm) em duas áreas (0,5 ha e 0,2 ha) no interior de um fragmento florestal, a Reserva da Cidade Universitária "Armando de Salles Oliveira" (CUASO), Butantã, São Paulo, SP (aproximadamente 23°34'S, 46°43'W) incluiu 227 indivíduos de 50 espécies. Foi encontrada dominância absoluta total (Do) de 20,1 m².ha-1, índice de Shannon (H´) de 3,04 nats.ind-1 e equabilidade de Pielou (J´) de 77,79%. Em cada área, foram encontradas regiões de concentração de espécies pioneiras, secundárias e climácicas. As duas áreas apresentaram diferenças na...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ombrophilous dense forest; Fragments; Structure; Diversity.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000300011
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Changements sociaux, organisation des producteurs et intervention externe. Infoteca-e
SABOURIN, E..
Dans la région semi-aride du Nordeste, la création d'organisations de petits producteurs est récente. Elle date généralement des années 80 et fait suite à l'organisation des communautés de base par l'Eglise catholique. Elle est souvent liée à l'intervention de l'Etat fédéral par I'intermédiaire de programmes spéciaux de lutte contre la sécheresse: Polonordeste, projet São Vicente, projet Sertanejo et, finalement, projet d'appui à Ia petite production (Papp), cofinancé par Ia Banque mondiale. L'une des principales lignes d'action de ces projets concernait Ia promotion des organisations d'agriculteurs. Celles-ci devaient faciliter l'acces des petits producteurs à Ia vulgarisation, au crédit et aux investissements communautaires.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Organizacao rural; Estrutura; Comunidade; Intervencao externa; Familiar farms; Small farmers; Rural organization; Social development; Structure; Communities; External intervention; Agricultura Familiar; Desenvolvimento Social; Pequeno Produtor.
Ano: 2001 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/134411
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Changes in physical properties and organic carbon of a Kandiudox fertilized with manure Ciência Rural
Andrade,Andréia Patricia; Rauber,Luiz Paulo; Mafra,Álvaro Luiz; Baretta,Dilmar; Rosa,Márcio Gonçalves da; Friederichs,Augusto; Mafra,Maria Sueli Heberle; Casara,Ana Cláudia.
ABSTRACT: Successive applications of pig slurry and poultry manure can improve the soil structure, according to the land use conditions and amounts applied. This study evaluated the effect of manure fertilization on the physical properties and organic carbon of a Rhodic Kandiudox. Treatments included land use and management and time of pig slurry and poultry litter application, namely: native forest (NF); yerba mate after 20 years of animal waste application (YM20); pasture after 15 years of application (P15); grassland after 20 years of manuring (PP20); grassland after 3 years of manuring (P3); pasture without application (P0), maize after 20 years of application (M20); and maize after 7 years of application (M7). Soil samples were collected in the 0-5,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal waste; Soil quality; Structure.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000500809
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CHEMICALLY TREATED GLUED LAMINATED PARICÁ TIMBER (Schizolobium parahyba var. amazonicum) REA
Terezo,Rodrigo F.; Córdova,Franciele O. de; Sampaio,Carlos A. de P..
ABSTRACT In the production of glue-laminated timber (GLT), boards derived from planted forest wood with easy workability are glued on top of one another. The main objective of the present work was to evaluate the performance of paricá timber GLT beams (5 × 10 cm) on GLT. Three procedures were performed: (1) GLT beams (5 × 10 cm) were produced using natural lamellae without chemical preservatives; (2) the individual lamellae (2.5 × 5 cm) were chemically treated, and then glued together; and (3) the beams formed from the glued natural lamellae (5 × 10 cm) were treated chemically. The positions of lamellae on the beams were determined by their modulus of elasticity values (MOE), which were estimated by a non-destructive bending test with a three-point load....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Timber; Beams; Structure.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000200158
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Comment protéger les acides gras polyinsaturés à longues chaînes oméga 3 (AGPI -- LC ω3) vis-à-vis de l’oxydation ? ArchiMer
Genot, Claude; Eymard, Sylvie; Viau, Michèle.
Increase the consumption of long-chain omega 3 polyunsaturated fatty acids (LC ω3 PUFA) is highly recommended for their health benefits. However, these fatty acids are very prone to oxidation, which can impair sensory, nutritional and functional properties of foods. In this paper the various ways that increase LC ω3 PUFA stability during processing and storage of food products are reviewed. To efficiently protect LC ω3 PUFA during processing and storage of foods, a combined strategy, taking into account both the matrix and the process should be undertaken. First the quality of the raw materials should be rigorously controlled by, for example, increasing contents of in situ antioxidants and decreasing length of storage. Then, during processing and storage...
Tipo: Text Palavras-chave: Oxidation; Lipids; Omega 3 polyunsaturated fatty acids; Antioxidants process; Formulation; Structure.
Ano: 2004 URL: https://archimer.ifremer.fr/doc/00480/59157/61786.pdf
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Comparative description and discussion of spermiogenesis and spermatozoal ultrastructure in some species of Heptapteridae and Pseudopimelodidae (Teleostei: Siluriformes) Neotropical Ichthyology
Quagio-Grassiotto,Irani; Spadella,Maria Angélica; Carvalho,Márcio de; Oliveira,Claudio.
The data obtained in the present study on spermiogenesis and spermatozoal ultrastructure of Pseudopimelodidae and Heptapteridae show that they share some characteristics, but greatly differ from each other. The main differences are the occurrence of type I spermiogenesis in Pseudopimelodidae and type III in Heptapteridae, the presence of nuclear fossa in Pseudopimelodidae and its absence in Heptapteridae, the presence of long midpiece in Pseudopimelodidae and short midpiece in Heptapteridae, the presence of cytoplasmic canal in Pseudopimelodidae and its absence in Heptapteridae, the presence of many large vesicles in the midpiece of Pseudopimelodidae and the presence of very long vesicles placed in the peripheral distal region in Heptapteridae, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Catfish; Spermatid; Sperm; Structure; Phylogeny.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000300008
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Compressive strength of rice husk stabilized termite hill soil CIGR Journal
Adekola, Kehinde Adedeji.
Termite hills are described as the structure built by termite using soil in the surrounding or within the earth. The mound has extremely hard walls constructed from bits of soil cemented with saliva and baked by the sun. This research is to determine the compressive strength of termite hill soil stabilized with rice husk. The study investigated the compressive strength of 150 mm x 150 mm x 150 mm cubes made from termite hill soil and rice husk in the different mix ratio of 50:50, 60:40, 70:30, 80:20, 100:0 and was cured for 28 d with crushing the cubes at 7 d interval. The weight, bulk density and dry density of the cubes at different THS/RH mix ratio ages were determined. Test results showed that the compressive strength of the cubes increases with age...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Termite hill soil; Clay; Rice husk; Compressive strength; Cubes; Structure; Farm; Nigeria.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3398
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Differentiation of albacore stock: review by oceanic regions ArchiMer
Nikolic, Natacha; Bourjea, Jerome.
Because one of the most common problems in fisheries is the definition of management units, we propose in this paper a bibliometric review focusing on the differentiation of Albacore populations, Thunnus alalunga, among and within oceanic regions (Atlantic, Pacific and Indian Oceans, and Mediterranean Sea). This paper is the first step of a current work on a global review of Albacore tuna using an international aquatic database (ASFA). For the present purpose, 367 publications, mainly composed of articles (64%), but also conference papers, proceedings and reports (24%), and books (12%), were analyzed. We will see that the concept of the stock and its delimitation is controversial because of the divergence of results. Such a conclusion makes us believe in...
Tipo: Text Palavras-chave: Albacore; Stock; Structure; Distribution; Thunnus alalunga.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00149/25990/24085.pdf
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Dynamique des populations bactériennes au cours de deux productions expérimentales de phytoplancton marin naturel ArchiMer
Bianchi, M.a.; Martin, Y.p..
Quantitative and qualitative variations of the hetero­trophic bacterial population, during two experimental induced phytoplanktonic blooms are described. When the phytoplanktonic population deceases, the bacte­rial population exhibits a significant increase. The spring microflore is quite different from the fall ones. Microbiological, physiological and biochemical fluctuations indicate qualitative fluctuations. Bacterial strains are identified as "bacterial profiles".
Tipo: Text Palavras-chave: Plancton; Bactéries; Dynamique; Physiologie; Structure; Plankton; Bacteria; Dynamic; Physiology; Structure.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00305/41669/40878.pdf
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Economic and social structures of water buffalo farming in Muş province of Turkey R. Bras. Zootec.
Işik,Mehmet; Gül,Mevlüt.
ABSTRACT The purpose of this study was to analyse the socio-economic structure of water buffalo farming in the province of Muş, in Turkey. The stratified sampling method was used to calculate sample size of buffalo farms in the Central, Korkut, and Hasköy districts of Muş province, where buffalo farming is widespread. Data were collected from the 94 farms by surveys in the 2013 production period. A single budget analysis method was used to calculate production cost and profit for water buffaloes. Plant production constituted 37.85% of the gross production value, while animal production accounted for 62.15%. The biggest share in the gross production value derived from water buffalo farming (45.71%). Fixed and variable costs were 51.44% and 48.56% of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Production cost; Profit; Structure.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000700400
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Effect of enzymatic hydrolysis on some physicochemical properties of root and tuber granular starches Ciênc. Tecnol. Aliment.
Rocha,Thaís de Souza; Carneiro,Ana Paula de Almeida; Franco,Celia Maria Landi.
Enzymatic hydrolysis of granular starch is an important tool to provide information about granule structure. Cassava, sweet potato, Peruvian carrot, and potato starches were hydrolyzed by bacterial α-amylase at 37 °C for 48 hours, and the physicochemical properties of the residues from hydrolysis were determined. Cassava starch was the most susceptible to enzyme displaying 20.9% of hydrolysis, whereas potato starch was the most resistant with 5.9%. The granule average size varied from 10.8 to 23.4 μm for Peruvian carrot and potato starches, respectively. With the use of SEM, a smooth granule surface was observed for all native starches. Cassava and sweet potato starches displayed an A-type X-ray diffraction pattern, while Peruvian carrot and potato...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Α-amylase; Granular starch; Structure.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000200039
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EFFECTS OF FEDERAL TAX POLICY ON AGRICULTURE AgEcon
Durst, Ron L.; Monke, James D..
This report analyzes the effects of the current Federal tax code on farming and evaluates tax proposals to assist beginning farmers. Investment, management, and production decisions in agriculture continue to be influenced by Federal tax laws. Farmers continue to benefit from both Federal income and estate tax policies targeted to agriculture. These provisions exert upward pressure on farmland values and help support ongoing trends that increase the number of very small and large farms. However, the influence of the current tax structure with lower marginal tax rates and a broader income base is less than in earlier decades and may be small relative to government farm programs. Tax proposals to assist beginning farmers would likely increase the...
Tipo: Report Palavras-chave: Federal tax policy; Income tax; Social security tax; Structure; Small farms; Estate and gift tax; Capital gains; Farm losses; Agricultural Finance; Public Economics.
Ano: 2001 URL: http://purl.umn.edu/33919
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Estructura poblacional y genética de Fagus grandifolia subsp. mexicana. Colegio de Postgraduados
Montiel Oscura, Diego.
Fagus grandifolia Ehrh. subsp. mexicana (Martínez) A. E. Murray, especie en estatus en la NOM059-SEMARNAT-2010, crece en poblaciones aisladas en la Sierra Madre Oriental. En el presente estudio se describió el tamaño, densidad, estructura y composición arbórea de tres bosques de F. grandifolia subsp. mexicana de reciente ubicación en los estados de Hidalgo y Nuevo León. También, se estimó la diversidad genética de siete poblaciones a través de electroforesis en geles de almidón. El número total de árboles en Tutotepec I y Tutotepec II en el Estado de Hidalgo, y Agua Fría en el Estado de Nuevo León fue 3,895, 6,758 y 4056, respectivamente. Árboles maduros con diámetro normal mayor a 20 cm dominaron en los tres bosques. El área basal varió entre 11.8 y 63.9...
Palavras-chave: Fagus grandifolia; Estructura; Composición arbórea; Structure; Tree composition; Maestría; Forestal.
Ano: 2011 URL: http://hdl.handle.net/10521/481
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Estructura poblacional y genética de Fagus grandifolia subsp. mexicana. Colegio de Postgraduados
Montiel Oscura, Diego.
Fagus grandifolia Ehrh. subsp. mexicana (Martínez) A. E. Murray, especie en estatus en la NOM059-SEMARNAT-2010, crece en poblaciones aisladas en la Sierra Madre Oriental. En el presente estudio se describió el tamaño, densidad, estructura y composición arbórea de tres bosques de F. grandifolia subsp. mexicana de reciente ubicación en los estados de Hidalgo y Nuevo León. También, se estimó la diversidad genética de siete poblaciones a través de electroforesis en geles de almidón. El número total de árboles en Tutotepec I y Tutotepec II en el Estado de Hidalgo, y Agua Fría en el Estado de Nuevo León fue 3,895, 6,758 y 4056, respectivamente. Árboles maduros con diámetro normal mayor a 20 cm dominaron en los tres bosques. El área basal varió entre 11.8 y 63.9...
Palavras-chave: Fagus grandifolia; Estructura; Composición arbórea; Structure; Tree composition; Maestría; Forestal.
Ano: 2011 URL: http://hdl.handle.net/10521/481
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ESTRUCTURA PRODUCTIVA Y DESEQUILIBRIO EXTERNO EN CARNE DE VACUNO ENTRE MÉXICO Y ESTADOS UNIDOS AgEcon
Araujo Andrade, Luis Alberto; Cruz Pacheco, Eraclio del Jesus.
The problem to investigate is the permanent disequilibrium of Mexican commercial balance of cattle heads and meat regarding United States during the period 1993-2007. The objective is shows that the inequality productive structure on cattle heads and meat that exists between Mexico and American Union, through commercial exchange of those products impact the commercial balance. The methodology used was the consult of international trade and productive aspects of cattle to both countries and the use of structuralism economic theory for the information analysis. The results obtained shows that the inequality structure between both nations (United States as centre and Mexico as periphery) on items such as herd size; integration to meat industry; meat...
Tipo: Journal Article Palavras-chave: Structure; External Disequilibrium; Centre; Periphery; Cattle; Heard; Meat.; Agribusiness.
Ano: 2010 URL: http://purl.umn.edu/93912
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