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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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Crude protein of Piatã grass leaf blade in systems in integration. Repositório Alice
FERREIRA, D. P.; ABREU, J. G. de; ALMEIDA, R. G. de; AZEVEDO. V. H. de; FERREIRA, E. A.; SALES, K. C.; RODRIGUES, J. A.; OLIVEIRA, E. S. B. de; OLIVEIRA NETO, V. J. de.
Tipo: Parte de livro Palavras-chave: Nutritional value; Stem; Senescence.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1134712
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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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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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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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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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Mass yield of Piatã grass in systems in integration. Repositório Alice
FERREIRA, E. A.; FERREIRA, D. P.; ABREU, J. G. de; ALMEIDA, R. G. de; AZEVEDO, V. H. de; SALES, K. C.; ASSIS, L. M. B.; SANDRI, V. T..
Tipo: Parte de livro Palavras-chave: Leaf; Stem; Senescence.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1134842
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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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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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Morphological, physicochemical and sensory evaluation of celery harvested from early to late maturity Horticultura Brasileira
Yommi,Alejandra Karina; Di Gerónimo,Natalia Marcela; Carrozzi,Liliana Esther; Quillehauquy,Victoria; Goñi,María Gabriela; Roura,Sara Inés.
The aim of this study was to determine quality changes in petioles of self-blanching celery (Apium graveolens), cv. Golden Boy, harvested at 80, 87, 94, 101, 108, 115, 122 and 129 days after-transplanting (DAT). Total weight (TW), total length (TL), number of leaves per plant (LN) and by plant zone (external, LNZ E; middle, LNZ M; internal, LNZ I), and petiole length (PL) were evaluated at each harvest time. Petioles quality of each zone in the plant were analyzed in terms of: color (hue angle), texture (cutting force), total soluble solids content (TSS) and titratable acidity (TA). The petioles also were sensorially evaluated by descriptive analysis considering visual characteristics (flexibility, hollowness), flavor (typical flavor and odor) and texture...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apium graveolens; Bolting; Growth; Maturity; Senescence; Texture.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362013000200010
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Near-isogenic lines of melon with different climacteric behavior as a tool to characterize fruit senescence traits National Institute of Agronomic Research
Obando-Ulloa, J.M.; Jowkar, M.M.; Moreno, E.; Souri, M.K.; Dos Santos, N.; Sanmartin, P.; Bueso, M.C.; Kessler, M.; Martinez, J.A.; Alarcon, A.; Nicolai, B.; Lammertyn, J.; Garcia-Mas, J.; Monforte, A.J.; Fernandez-Trujillo, J.P..
Aroma volatiles and fruit quality traits at harvest or after senescence were determined in a collection of near-isogenic lines (NILs) with different climacteric behavior (two non-climacteric NILs more the parental non-climacteric ´Piel de sapo´ and the rest climacteric). Data were analyzed by partial least squares discriminant analysis. In senescent fruit, four ester volatiles (particularly benzyl acetate) helped to discriminate between climacteric and non-climacteric NILs. Aroma volatiles were more efficient for discriminating by senescent or climacteric behavior than fruit quality traits, and flavor traits (dry matter, soluble solids content, titratable acidity, and individual sugars and organic acid content) were more efficient than using other major...
Tipo: Poster Palavras-chave: Aroma volatiles; Fruit over-ripening; Fruit quality; Multivariate discriminant analysis; Postharvest; Cucumis melo; Quality traits; Firmness; Senescence.
Ano: 2008 URL: http://hdl.handle.net/2174/202
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Physiological aspects of leaf senescence during spikelet filling in rice (Oryza sativa L.) International Rice Research Institute
Park, Tae-Shik.
174 leaves : ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Leaves; Senescence; Filling period; Plant physiology.
Ano: 1991 URL: http://hdl.handle.net/123456789/931
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Sensitivity of ornamental pepper to ethylene Horticultura Brasileira
Ribeiro,Wellington S; Carneiro,Clebson dos S; França,Christiane de Fátima M; Pinto,Cleide Maria F; Lima,Paula Cristina C; Finger,Fernando L; Costa,Franciscleudo B da.
ABSTRACT The genus Capsicum has varying levels of sensitivity to ethylene. Variability knowledge allows planning post-production methodologies of potted pepper plants and can be used in breeding programs. The objective of this study was to evaluate the ethylene sensitivity of three ornamental pepper genotypes of the germplasm bank of Universidade Federal de Viçosa. Pepper plants were exposed to 10 μL L-1 ethylene during 48 hours. The flowers were highly sensitive to exogenous ethylene in all genotypes except Pimenta colorida which was moderately sensitive. Regarding leaf abscission, Pimenta colorida and Pimentão ornamental are classified as highly sensitive to ethylene application. Already the fruits responded with the early appearance of the typical...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Capsicum annuum; Senescence; Commercialization; Post-harvest losses.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000400458
Registros recuperados: 29
Primeira ... 12 ... Última
 

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