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Amorphous silica biomineralizations in Schoenoplectus californicus (Cyperaceae): their relation with maturation stage and silica availability Boletín de la Sociedad
Fernández Honaine,Mariana; Borrelli,Natalia L; Osterrieth,Margarita; Del Rio,Luis.
The factors involved on the silicifcation process in Cyperaceae are scarcely known. In this study we analyse the effect of maturation stage and silica availability on the production of amorphous silica biomineralizations in culms of Schoenoplectus californicus. Young and senescent culms were collected from ponds with different silica availability. Two complementary methodologies (calcination and staining techniques), light and scanning electron microscopy and EDS were applied for amorphous silica analyses in plants. Quantitative data were analysed by Kruskal-Wallis and a two-way ANOVA tests. There were no signifcant differences between silica content of culms collected in ponds with different silica availability. Instead, silica content in senescent culms...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sedge; Silicophytoliths; Senescence; Aerenchyma; Culms; Ponds; SE Buenos Aires province.
Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722013000200006
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Arctiin blocks hydrogen peroxide-induced senescence and cell death though microRNA expression changes in human dermal papilla cells Biol. Res.
Bae,Seunghee; Lim,Kyung Mi; Cha,Hwa Jun; An,In-Sook; Lee,Jeong Pyo; Lee,Kwang Sik; Lee,Ghang Tai; Lee,Kun Kook; Jung,Ho Jung; Ahn,Kyu Joong; An,Sungkwan.
BACKGROUND: Accumulating evidence indicates that reactive oxygen species (ROS) are an important etiological factor for the induction of dermal papilla cell senescence and hair loss, which is also known alopecia. Arctiin is an active lignin isolated from Arctium lappa and has anti-inflammation, anti-microbial, and anti-carcinogenic effects. In the present study, we found that arctiin exerts anti-oxidative effects on human hair dermal papilla cells (HHDPCs). RESULTS: To better understand the mechanism, we analyzed the level of hydrogen peroxide (H2O2)-induced cytotoxicity, cell death, ROS production and senescence after arctiin pretreatment of HHDPCs. The results showed that arctiin pretreatment significantly inhibited the H2O2-induced reduction in cell...
Tipo: Journal article Palavras-chave: Dermal papilla cell; Senescence; Cell death; MicroRNA; Arctiin.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100073
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Changes in lipid profile during growth and senescence of Catharanthus roseus leaf Braz. J. Plant Physiol.
Mishra,Sanjay; Tyagi,Abhishek; Singh,I.V.; Sangwan,R.S..
Various lipid classes and compounds were monitored during the period of leaf emergence to leaf drop of Catharanthus roseus. The expansion to early maturation phase was accompanied by cellular build-up of all major lipid classes, whilst aging and senescence were characterized by their substantial decline, except for the neutral lipids; the leaf monogalactosyl diglyceride/digalactosyl diglyceride ratio decreased from 4.3 (complete maturity) to 2.1 (abscised stage). The early maturation stage was the earliest stage when appreciable amounts of free sterols and fatty acids could be observed. Sterol/phospholipids ratios increased by 68-fold in the abscised leaf as compared to that at full maturity. The unsaturated/saturated fatty acid ratio was far lower in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Catharanthus roseus; Glycolipids; Leaf development; Phospholipids; Senescence; Sterol.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000400002
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Conservacao pos-colheita de alface cultivada com composto organico. Repositório Alice
SANTOS, R.H.S.; SILVA, F. da; CASALI, V.W.D.; CONDE, A.R..
O objetivo deste trabalho foi avaliar o efeito da adubação com composto orgânico, na presença e na ausência de adubação mineral padrão, na conservação pós-colheita das plantas de alface cultivar Babá. O composto orgânico foi aplicado nas doses de 0,0, 22,8, 45,6, 68,4 e 91,2 t/ha de matéria seca. Foram avaliadas a perda de matéria fresca em condições de ambiente e a degradação da clorofila em câmara fria (4oC) até 84 horas e 12 dias, respectivamente, após colheita. A aplicação de doses crescentes de composto orgânico reduziu a perda de matéria fresca após a colheita em até 7%; os teores de clorofila decresceram durante o armazenamento, em plantas adubadas com 45,6 e 91,2 t/ha de composto orgânico e adubo mineral, atingindo cerca de 0,3 mg/g de tecido...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Lactuca sativa; Adubos compostos; Adubos organicos; Fisiologia pos-colheita; Perdas; Senescencia; Compound fertilizers; Organic fertilizers; Post harvest physiology; Losses; Senescence.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/103744
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Development of conceptacles in Amphiroa (Corallinales, Rhodophyta) Acta Botanica
Rosas-Alquicira,Edgar Francisco; Riosmena-Rodríguez,Rafael; Hernández-Carmona,Gustavo; Neto,Ana Isabel.
Here, we describe the development of sporangial and gametangial conceptacles for Amphiroa beauvoisii and A. vanbosseae; sporangial conceptacles only for A. misakiensis; and gametangial conceptacles only for A. cryptarthrodia and A. rigida. The descriptions are based on the observation of histological preparations obtained from 112 specimens collected from the Gulf of California, in Mexico, and the Azores archipelago of Portugal. Information on the development of the sporangial conceptacle pore and conceptacle senescence is here described and illustrated for the first time. Four development patterns were observed: two for sporangial conceptacles; one for spermatangial conceptacles; and one for carposporangial conceptacles. The phases of development of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carposporangial filament origin; Sporangium location; Sporangial pore canal anatomy; Senescence; Taxonomy.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400008
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Dynamics of forage accumulation in Elephant grass subjected to rotational grazing intensities R. Bras. Zootec.
Sousa,Braulio Maia de Lana; Nascimento Júnior,Domicio do; Monteiro,Hélida Christhine de Freitas; Silva,Sila Carneiro da; Vilela,Hélio Henrique; Silveira,Márcia Cristina Teixeira da; Rodrigues,Carlindo Santos; Sbrissia,André Fischer.
We assessed the accumulation dynamics of forage and its components in Elephant grass cv. Napier (Pennisetum purpureum Schum.) that were subjected to three post-grazing height treatments (30, 50, and 70 cm) from February through May 2009 (experiment one) and December 2009 through May 2010 (experiment two). In experiment one, the grazing events started when the light interception by the canopy reached 95%. The same was adopted for experiment two, except for the first grazing event, which was based on the height of the apical meristems of basal tillers. The experimental design for both experiments was a randomized complete block with three replications. The pastures that were managed at a post-grazing height of 30 cm exhibited lower rates of leaf and stem...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grazing management; Growth; Light interception; Pennisetum purpureum; Senescence; Tiller categories.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000900004
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Enchimento de sementes em linhas quase-isogênicas de trigo com presença e ausência do caráter "stay-green". Repositório Alice
SILVA, S.A.; CARVALHO, F.I.F. de; NEDEL, J.L.; CRUZ, P.J.; PESKE, S.T.; SIMIONI, D.; CARGNIN, A..
O caráter "stay-green" (permanência da cor verde nas plantas) tem sido utilizado para reduzir a senescência em trigo, resultando no aumento funcional da área foliar, e, conseqüentemente, na elevação da taxa e da duração do enchimento da semente. O objetivo deste trabalho foi analisar a taxa de acúmulo de matéria seca e a duração do período de enchimento da semente de linhas quase-isogênicas de trigo diferenciadas quanto à presença e ausência do caráter "stay-green". O experimento foi conduzido no Centro Experimental da Palma, Pelotas, RS. Foram utilizadas quatro linhas quase-isogênicas: F6-SG e F6-SZ, no ano de 2000 e F7-SG e F7-SZ no ano 2001, com cinco repetições. O caráter "stay-green" permitiu maior deposição de reservas na semente na fase próxima do...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Triticum aestivum; Matéria seca; Peso da semente; Senescência; Dry matter; Seed weight; Senescence.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/handle/doc/109000
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Expression profiling using Affymetrix GeneChip Microarrays in sugarcane during leaf senescence. Repositório Alice
MARTINS, N. F.; PATIL, S.; MOLINARI, H. B. C.; DIAS, B. B. A.; MARTINS, M. T. B.; QUIRINO, B. F.; EMMERSON, Z.; AMOS, B.; MAY, S..
2011
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Microarray; Sugarcane; Senescence.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/908739
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Forage accumulation in brachiaria grass under continuous grazing with single or variable height during the seasons of the year R. Bras. Zootec.
Santos,Manoel Eduardo Rozalino; Fonseca,Dilermando Miranda da; Gomes,Virgílio Mesquita.
The objective of this study was to evaluate grazing management strategies of Brachiaria decumbens cv. Basilisk managed with different heights under continuous grazing with cattle. Two grazing management strategies were evaluated: maintenance of pasture with an average height of 25 cm throughout the experimental period and maintenance of pasture on the average of 15 cm in height during winter, up to 25 cm from the beginning of spring. The split-plot scheme and the randomized block design with four replications were adopted. The grazing management strategies corresponded to the primary factor, while the seasons (winter, spring and summer) corresponded to secondary factor. The reduction of the average sward height to 15 cm in the winter resulted, when...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria decumbens; Grazing management; Growth; Senescence.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000500002
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Forage productivity and morphogenesis of Axonopus aureus under different nitrogen fertilization rates R. Bras. Zootec.
Costa,Newton de Lucena; Moraes,Anibal de; Monteiro,Alda Lúcia Gomes; Motta,Antonio Carlos Vargas; Oliveira,Ricardo Augusto de; Rodrigues,Antonio Neri Azevedo.
The effect of nitrogen (N) fertilization (0, 50, 100 and 200 kg N ha-1) on forage yield and morphogenesis of Axonopus aureus was evaluated in the savannas of Roraima State, Brazil. The experimental design was in randomized blocks with three replicates. The grass showed high responsiveness to N fertilization. Dry weight (DW) yield, morphogenetic and structural traits and forage quality were positively affected by N fertilization. The effects of N fertilization on DW yield, N content, leaf appearance rate, leaf elongation rate, number of live leaves/tiller, final leaf length and leaf area index were quadratic and maximum values were estimated with application of 168.8 (2,181 kg ha-1); 124.8 (21.1 g/kg); 158.5 (0.163 leaf/day per tiller); 172.3 (2.75...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dry weight; Leaf; Senescence; Tillering.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000800002
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Growth and reproduction of the understory palm Geonoma schottiana Mart. in the gallery forest in Central Brazil Rev. Bras. Bot.
Sampaio,Maurício Bonesso; Scariot,Aldicir.
To understand the growth and reproduction of the palm Geonoma schottiana in the gallery forest of Central Brazil, two hypotheses were raised: (i) production of leaves and reproductive structures are concentrated in the period of the year with high light availability; (ii) leaf production and reproductive activity are related to plant length. However, it is expected that senility effects will cause fast reduction in growth and reproduction activities in higher plants. Growth and reproduction were concentrated in the dry season, when insolation is higher than in the wet season, suggesting that leaf and inflorescence production on G. schottiana in the gallery forest understory is more limited by light than by soil humidity. As the individual grows, leaf...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Life stage; Reproductive and vegetative phenology; Seasonality; Senescence.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000300007
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Influência da sacarose e do corte da base da haste na longevidade de inflorescências de Zinnia elegans. Repositório Alice
CARNEIRO, T.F.; FINGER, F.L.; SANTOS, V.R. dos; NEVES, L.L. de M.; BARBOSA, J.G..
Flores de zínia (Zinnia elegans Jacq.) são adaptadas às condições climáticas da Região Sudeste do País, com excelente potencial para a comercialização como flor de corte. O presente trabalho objetivou avaliar a influência da sacarose aplicada na forma de solução de condicionamento, e do corte periódico da base das hastes sobre a longevidade e absorção de água pelas flores. Hastes florais uniformizadas em tamanho foram submetidas ao condicionamento, por seis horas, com sacarose a 5, 10, 15 e 20% ou com soluções de 10% de sacarose por 0, 6, 12, 18 e 24 horas, com ou sem cortes periódicos na base das hastes a cada 48 horas. O tratamento das flores por seis horas com sacarose a 5, 10, 15 ou 20% não afetou a longevidade das flores, comparado àquelas mantidas...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Zinnia elegans; Flor; Etileno; Absorção de água; Senescência; Flowers; Ethylene; Water uptake; Senescence.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/108303
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Infodynamics, a Developmental Framework for Ecology/Economics Ecology and Society
Salthe, Stanley N; Biological Sciences, Binghamton University; ssalthe@binghamton.edu.
Infodynamics, for our purposes, is a developmental perspective that animates information theory by way of thermodynamics. The isomorphism between Boltzmann's statistical interpretation of physical entropy as disorder and Shannon's formulation of variety as informational entropy signals a deep connection between information and entropy production. Information is any configuration that might have been different, providing that it delays energy dissipation so that the energy is dissipated more completely. The entropy production of individual dissipative structures increases at first but eventually decelerates. I consider the questions: why do these structures grow? And why don't they keep on growing? As the universal expansion of the Big Bang accelerated,...
Tipo: Peer-Reviewed Reports Palavras-chave: Big Bang; Minot-Aoki law; Development; Developmental trajectories; Dissipative structures; Ecosocial systems; Energy gradient dissipation; Entropy production; Information; Senescence; Second law of thermodynamics.
Ano: 2003
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Inibição do amadurecimento de abacate com 1-metilciclopropeno. Repositório Alice
KLUGE, R.A.; JACOMINO, A.P.; OJEDA, R.M.; BRACKMANN, A..
O abacate (Persea americana) é um fruto climatérico que apresenta alta taxa respiratória e alta produção de etileno após a colheita, o que o torna altamente perecível. Por isso, o controle do amadurecimento desse fruto é fundamental para o aumento da vida útil de prateleira. Abacates 'Quintal' foram tratados com o bloqueador da ação do etileno 1-metilciclopropeno (1-MCP) nas concentrações de 0, 30, 90 e 270 nL L-1 durante 12 horas a 24oC e armazenados sob condições ambientais (24oC) por nove dias. Diariamente foram analisadas as variáveis coloração da casca e polpa, firmeza de polpa, porcentagem de frutos maduros (firmeza £ 8 Newtons), porcentagem de podridões, taxa respiratória e produção de etileno. O delineamento experimental foi inteiramente...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Persea americana; Produção de etileno; Senescência; Armazenamento; Pós-colheita; Ethylene production; Senescence; Storage; Postharvest.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/107443
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Laser speckle techniques in quality evaluation of orange fruits AGRIAMBI
Rabelo,Giovanni F.; Braga Júnior,Roberto A.; Fabbro,Inácio M. D..
This work presents a study of a new technology applied in quality tests of oranges. Evaluations were performed using a nondestructive and noninvasive method based on the interpretation of an optical phenomenon that occurs when the fruit is illuminated with coherent light, referred as biospeckle. The speckle patterns of laser light scattered in orange fruits have been measured through their quantification. For the quantification of the variation by biospeckle, the autocorrelation function and the modified occurrence matrix were used. From these functions, two parameters were obtained: the statistical cummulant and the moment of inertia, calculated from the modified occurrence matrix. These values were used as quality and senescence indicators for the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological material; Senescence; Biospeckle.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662005000400021
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Longevidade e oviposição de Ophyra albuquerquei (Diptera, Muscidae) em condições de laboratório Iheringia, Sér. Zool.
Krüger,Rodrigo F.; Ribeiro,Paulo B.; Carvalho,Claudio J. B. de; Lambrecht,Francine M.; Nunes,Adrise M..
Aspects related to the longevity and oviposition of Ophyra albuquerquei Lopes, 1985 are studied. Males had a mean lifespan longer than females (40.24 vs. 33.15 days, respectively), while still possessing qualitative advantages during this period. Females O. albuquerquei were fed on powdered milk, fish flour, refined sugar and water, and provided fish flour and moistened sawdust for oviposition. The length of the oviposition period for females was 46.75 days, and most of the deposition of the eggs occurred in the first days of the colony. Females completed 50% of their egg deposition by Day 16, seven days before the large last mortality peak and about 12 days after the first oviposition in the colony. Females deposited an average of 184 eggs per individual....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artificial diet; Lifespan; Mortality; Ophyra; Senescence.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000200014
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Mechanical behavior of 'Niagara Rosada' grape berry detachment REA
Gomes,Daniel; Ferraz,Antonio C. de O.
The 'Niagara Rosada' grape is the main Brazilian table grape belonging to the Labrusca family. It develops medium, cylindrical and compact bunches with berries presenting a pinkish skin and a foxy flavor that is valued in the Brazilian market. These berries are tender and have a pedicel-berry connection provided by the vascular bundles and surrounding skin. This cultivar is very susceptible to berry drop mainly caused by vibration and senescence. The objective of this study was to evaluate the temporal mechanical behavior of the pedicel-berry detachment, using resistance indexes extracted from traction force-deformation curves. Test results showed two different detachment types. In the first one, which exhibited higher average resistance, a considerable...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Postharvest; Viticulture; Mechanical properties; Senescence.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600009
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Morfogênese e acúmulo de biomassa foliar em pastagem de capim-elefante avaliada em diferentes épocas do ano. Repositório Alice
PACIULLO, D.S.C.; DERESZ, F.; AROEIRA, L.J.M.; MORENZ, M.J.F.; VERNEQUE, R. da S..
O objetivo deste trabalho foi avaliar o efeito da época do ano nas características morfogênicas e estruturais e no acúmulo de biomassa foliar de uma pastagem de capim-elefante (Pennisetum purpureum Schum.). Vacas mestiças Holandês x Zebu foram manejadas segundo o método de pastejo com lotação rotacionada com três dias de ocupação e 30 dias de descanso. Foi usado delineamento em blocos casualizados com seis repetições. As avaliações foram realizadas em fevereiro/março, abril/maio, julho/agosto e outubro de 2001. As maiores taxas de alongamento e aparecimento de folhas ocorreram durante fevereiro/março. Os perfilhos aéreos superaram os basilares em quantidade, mas apresentaram menores taxas de alongamento (5,1 versus 9,8 cm/dia/perfilho), aparecimento (0,13...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pennisetum purpureum; Folha; Alongamento; Perfilhamento; Senescência; Pastejo rotativo; Leaves; Elongation; Tillering; Senescence; Rotational grazing.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/handle/doc/109129
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Morphogenesis of the giant missionary grass in response to pig slurry fertilization Ciência Rural
Zabot,Valdirene; Scheffer-Basso,Simone Meredith; Miranda,Mario; Kotwittz,Daiane Karla; Brustolin,Karen Doering.
The morphogenesis of giant missionary grass (Axonopus jesuticus x A. scoparius) was evaluated in this study in response to the application of 0, 40, 80, 120, 160, and 200m³ ha-1year-1 of pig slurry, calculated to provide 0, 100, 200, 300, 400, and 500kg N ha-1year-1, respectively. The experiment was carried out in the field, at Chapecó, Santa Catarina, Brazil, in 2010-2011. The doses were fractioned in four applications, performed after the pasture cuttings, during the growth season of the grass. Morphogenetic evaluations were performed weekly between 10/26/2010 and 12/07/2010 (spring), 12/14/2010 and 01/11/2011 (late spring/early summer), 01/18/2011 and 02/07/2011 (summer), and 02/15/2011 and 03/21/2011 (late summer). The leaf senescence, leaf elongation,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canopy structure; Leaf elongation; Organic manure; Senescence; Tiller..
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001001790
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Morphogenetic characteristics and management of Tanzania grass PAB
Santos,Patricia Menezes; Balsalobre,Marco Antônio Alvares; Corsi,Moacyr.
The objective of this work was to evaluate the effect of grazing interval and period of evaluation over tissue turnover in Tanzania grass pastures (Panicum maximum cv. Tanzania) and to ascertain if herbage accumulation rate can be used as a criterion to establish a defoliation schedule for this grass in Southeast of Brazil. A randomized block design with a split-plot arrangement was used. The effect of three grazing intervals was evaluated within seven periods between October 1995 and September 1996. Responses monitored were leaf and stem elongation rates, leaf senescence rate, stem length, and tiller density. Net herbage accumulation rate was calculated using tissue turnover data. The grazing intervals for Tanzania grass should be around 38 days between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaves; Elongation; Senescence; Grazing systems.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000800012
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