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A time-energy analysis of daytime surface activity in degus, Octodon degus RChHN
Kenagy,G.J.; Vásquez,Rodrigo A.; Nespolo,Roberto F.; Bozinovic,Francisco.
We present an analysis of time and energy allocation in a day-active caviomorph rodent, the degu, Octodon degus, in central Chile. We quantified components of surface activity in the field on a daily basis in individual degus near the time of the summer solstice, when conditions of heat and aridity were also at a seasonal extreme, in order to answer the following questions. Does the absolute time available for surface activity limit performance? Does the allocation of time and energy for locomotion place a functionally significant limitation on overall energy balance and performance? Degus spent about 2/3 of their above-ground time foraging; they remained stationary about 88 % of the time, walked around slowly about 10 %, and were running rapidly from one...
Tipo: Journal article Palavras-chave: Time; Energy; Activity; Central Chile.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100014
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Activity and population characteristics of Andean Condors in southern Chile RChHN
SARNO,RONALD J.; FRANKLIN,WILLIAM L.; PREXL,WALTER S..
Data were collected on general activity patterns and population characteristics of free-ranging Andean Condors Vultur gryphus in Torres del Paine National Park, Chile from July 1992 to June 1994 during 3,680 h of observation. Seasonal differences were evident in relative abundance and activity patterns. The mean number of condors sighted/ observation significantly higher in fall-winter than in spring-summer. There was a significant decrease from spring-summer to fall-winter in the percentage of observations during which we sighted solitary condors and a significant increase in the number of groups of condors. In addition, mean monthly maximum group size was significantly larger in fall-winter than spring-summer. The sex ratio (males:females ) of juveniles...
Tipo: Journal article Palavras-chave: Andean Condor; Activity; Patagonia; Sex ratio.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100001
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Adsorption, immobilization and activity of cellulase in soil: the impacts of maize straw and its humification BABT
Sinegani,Ali Akbar Safari; Sinegani,Mahboobe Safari.
The present work aimed to study some aspects of sorption and immobilization of cellulase molecules on soil components by the analysis of the reactions of cellulase in a soil treated with different levels of maize residue and incubated for 90 days. The analysis of variance showed that the effects of the treatments of maize straw, incubation time and their interaction on cellulase adsorption, desorption and immobilization were statistically significant. The adsorption and immobilization capacities of soil by application of maize straw increased significantly. However they decreased with decreasing the soil organic matter (SOM) after 45 days of incubation. The desorption of adsorbed cellulase molecules from the soil by washing with distilled water depended on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Maize straw; Humification; Cellulase; Sorption; Immobilization; Activity.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000600001
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Antioxidant activity of jacaranda decurrens Cham. Repositório Alice
CARVALHO, C. A.; LOURENÇO, M. V.; BERTONI, B. W.; FRANÇA, S. C.; PEREIRA, P. S.; FACHIN, A. L.; PEREIRA, A. M. S.; MORAES, R. M.; CERDEIRA, A. L..
Many diseases and related degenerative processes including heart, câncer and Parkinson diseases are associated with rcactive oxygen species (ROS). In an effort Io preveni diseases, search for com-pounds with antioxidant activity hás been a major interestof dif-ferent research groups in natural products research. The objective of this research was to investigatethe antioxidant activity of EtOH leaf extract ofjacarando decurrrens and its fractions using the 2,2-diphenyl-2-picrylhydrazyl hydrate (DPPH) assay [lJ, that uses s pé ciro me t ric method to determine radical scavenging activity, Rutinattheconcçntrationof l.Omg-L was used as the standard. Our results ha vê shown lhat crude extract and fractions had anti-oxidant activities mainly if tested at...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Antioxidant; Activity; Jacaranda; Decurrens.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/16158
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Assessment of biospeckle activity of lemon fruit CIGR Journal
Ansari, Mohammad Zaheer; A. K., Nirala.
Bio-speckle can be used as a method for analysing the activity of biological materials illuminated with laser beam.  Physically, bio-speckles are the result of scattering of coherent light on moving particles inside living tissue.  Therefore, the aim of this study was to investigate bio-speckle activity in lemons and determine the age of the lemon fruit from the observation of its dynamic speckle pattern.  The speckle pattern of laser light scattered in lemon fruits were measured through their quantification.  For the quantification of the variation by bio-speckle, two different methods of image analysis were used: moment of inertia and the spatial temporal speckle correlation coefficient.  The bio-speckle activities were also characterized by the line...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bio-speckle; Time history speckle Pattern; Line profile; Lemon; Activity.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3237
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Characterization of biofilm extracts from two marine bacteria ArchiMer
Passerini, Delphine; Fecamp, Florian; Marchand, Laetitia; Kolypczuk, Laetitia; Bonnetot, Sandrine; Sinquin, Corinne; Verrez-bagnis, Veronique; Hervio Heath, Dominique; Colliec Jouault, Sylvia; Delbarre Ladrat, Christine.
In the marine environment, biofilm formation is an important lifestyle for microorganisms. A biofilm is comprised of cells embedded in an extracellular matrix that holds them close together and keeps the biofilm attached to the colonized surface. This predominant lifestyle and its main regulation pathway, namely quorum-sensing (QS), have been shown to induce specific bioactive metabolites. In this study, we investigated the biofilm formation by two marine bacteria belonging to the Vibrio species to discover potentially innovative bioactive compounds. We proposed a protocol to isolate biofilm extracts, to analyze their biochemical composition, and to compare them to planktonic cell extracts. Cells were grown attached to a plastic surface; extracts were...
Tipo: Text Palavras-chave: Vibrio; Biofilm; Polysaccharide; Quorum-sensing; Activity.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00592/70381/68461.pdf
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Cloning, characterization and expression of a novel laccase gene Pclac2 from Phytophthora capsici BJM
Feng,Bao Zhen; Li,Peiqian.
Laccases are blue copper oxidases (E.C. 1.10.3.2) that catalyze the one-electron oxidation of phenolics, aromatic amines, and other electron-rich substrates with the concomitant reduction of O2 to H2O. A novel laccase gene pclac2 and its corresponding full-length cDNA were cloned and characterized from Phytophthora capsici for the first time. The 1683 bp full-length cDNA of pclac2 encoded a mature laccase protein containing 560 amino acids preceded by a signal peptide of 23 amino acids. The deduced protein sequence of PCLAC2 showed high similarity with other known fungal laccases and contained four copper-binding conserved domains of typical laccase protein. In order to achieve a high level secretion and full activity expression of PCLAC2, expression...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phytophthora capsici; Laccase; Expression; Purification; Activity.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000100050
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Contributo para a caracterização do sistema de lipases em Yarrowia Lipolytica IPB - Escola Superior Agrária
Choupina, Altino.
De entre as espécies de leveduras, Yarrowia lipolytica é uma das maiores produtoras de proteínas extracelulares (proteases ácidas neutras e alcalinas, fosfatase ácida, ribonucleases e lipases). As lipases (triacilglicerol hidrolases) são enzimas importantes no metabolismo das gorduras, catalizando a ruptura dos triacilgliceróis em ácidos gordos livres e glicerol. Para além da baixa solubilidade dos seus substratos naturais, esta hidrólise é catalizada na interface entre um substrato insolúvel e a fase aquosa na qual a enzima está solubilizada. Este aspecto distingue-as das esterases , as quais catalizam preferencialmente a hidrólise de ésteres solúveis em água. As lipases constituem um grupo ubíquo de enzimas capazes de catalizarem diversas reacções,...
Tipo: DoctoralThesis Palavras-chave: Lipase; Yarrowia sp.; Activity; Cloning; YILIP1; YILIP3.
Ano: 2001 URL: http://hdl.handle.net/10198/6187
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Do broilers prefer to eat from a certain type of feeder? Rev. Bras. Ciênc. Avic.
Neves,DP; Nääs,IA; Vercellino,R do A; Moura,DJ de.
This study compared three types of feeders for broilers: Fênix, Tube and Automatic feeders. Bird's feeding behavior and preference were considered in this the evaluation. Preference was assessed by examining birds' behavioral activities, such as eating, standing and lying around the equipments, and meal duration as function of the environmental variables. Data on the behavioral activities and meal size were collected in a broiler commercial farm using a portable video camera, and the direct footages were analyzed. The time spent in each activity, feeding bout duration and time spent near the trough were statistically analyzed using the test of means and medians. Pearson's correlation test was used to evaluate the relationship between ambient environmental...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activity; Broiler behavior; Feeder efficiency; Feeding strategic.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000300007
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Ecology of a snake assemblage in the Atlantic Forest of southeastern Brazil Pap. Avulsos de Zool. (São Paulo)
Hartmann,Paulo A.; Hartmann,Marília T.; Martins,Marcio.
The main objective of this study was to examine the natural history and the ecology of the species that constitute a snake assemblage in the Atlantic Rainforest, at Núcleo Picinguaba, Parque Estadual da Serra do Mar, located on the northern coast of the state of São Paulo, southeastern Brazil. The main aspects studied were: richness, relative abundance, daily and seasonal activity, and substrate use. We also provide additional information on natural history of the snakes. A total of 282 snakes, distributed over 24 species, belonging to 16 genera and four families, has been found within the area of the Núcleo Picinguaba. Species sampled more frequently were Bothrops jararaca and B. jararacussu. The methods that yielded the best results were time constrained...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Assemblage; Snake; Diet; Habitat use; Activity.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492009002700001
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Ecology of Ischnocnema parva (Anura: Brachycephalidae) at the Atlantic Rainforest of Serra da Concórdia, state of Rio de Janeiro, Brazil Rev. Bras. Zool.
Martins,Ana Cristina J. S.; Kiefer,Mara C.; Siqueira,Carla C.; Van Sluys,Monique; Menezes,Vanderlaine A.; Rocha,Carlos Frederico D..
Ischnocnema (Brachycephalidae) includes many species that are important members of the leaf litter frog communities in the Atlantic Rainforest of Brazil. Ischnocnema parva (Girard, 1853) is endemic to the Atlantic Rainforest biome and is restricted to the forests of southeastern Brazil. Currently, the available information about the ecology of I. parva is scarce. We studied the diet, the habitat use, reproduction and density of I. parva in an area of Atlantic Rainforest at the Concórdia mountain range, Rio de Janeiro. Individuals of I. parva were captured in April 2005 using different sampling methods: time constrained search (transects), plots of 5 x 5 m (25 m²) on the litter, and pitfall traps with drift fences. We found 240 frogs; 35 females and 205...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activity; Density; Diet; Habitat use; Reproduction.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000200007
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Effects of moonlight on the capturability of frugivorous phyllostomid bats (Chiroptera: Phyllostomidae) at different time scales Rev. Bras. Zool.
Mello,Marco A. R.; Kalko,Elisabeth K. V.; Silva,Wesley R..
Some bat species seem to be lunar phobic, i.e., they avoid flying in bright areas or during bright periods of the night; however, the evidence is still controversial. We think that part of this controversy comes from pooling data on bat captures and moonlight intensity according to broad categories, such as moon phases, which conceal the high variability among nights. Therefore, we used detailed, long-term field data on three phyllostomid bat species, in order to test the hypothesis of lunar phobia at two different time scales: 1) among nights, by pooling data of different nights according to moon phases and testing for differences in the distribution of captures; and 2) within a night, by analyzing the relationship between capturability and moonlight...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activity; Behavior; Foraging; Lunar phobia; Mist netting.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000400005
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Energetic costs of reproduction in female northern muriquis, Brachyteles hypoxanthus (Primates: Platyrrinhi: Atelidae) Zoologia
Guedes,Danusa; Young,Robert J.; Strier,Karen B..
Infant care is known to impose high energetic costs on female primates because in addition to lactation, most primate mothers also provide transport for their offspring. Many studies have documented the high energetic costs of lactation, but less is known about energetic costs of infant carrying and their effects on the recovery of maternal physical condition. We compared the activities of female northern muriquis (Brachyteles hypoxanthus Kuhl, 1820) over a 12-month period at the RPPN Feliciano Miguel Abdala, Minas Gerais, Brazil to investigate whether mothers during their weaning year behaved differently than mothers in their post-weaning year, when they resumed reproductive cycling and copulating, and conceived again. We found no significant differences...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activity; Infant carrying; Maternal energetics; Reproduction weaning.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000400002
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Evaluation of cytotoxicity and biological activities in extracellular polysaccharides released by cyanobacterium Arthrospira platensis BABT
Challouf,Rafika; Trabelsi,Lamia; Ben Dhieb,Rym; El Abed,Omeya; Yahia,Ali; Ghozzi,Khamissa; Ben Ammar,Jihen; Omran,Hela; Ben Ouada,Hatem.
The aim of this work was to evaluate the cytotoxicity of Arthrospira platensis Extracellular Polymeric Substances (EPS) for colon cancer and kidney cell lines. Results showed that EPS were free from cytotoxic effects. A variety of solvents were assessed for their ability to extract the bioactive ingredients from EPS. Methanol gave the highest yield (75.75%) than other solvents. The extracts were tested for activities against a collection of Gram+/- bacteria. The methanol extract exhibited a more potent activity than the other organic extracts, whereas the aqueous extract was active against Staphylococcus epidermis (Gram+) and Salmonella typhimurium (Gram-). Finally, The extracts were also tested for the antioxidant activity, using the Trolox Equivalent...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyanobacteria; Exoplysaccharides; Cytotoxicity; Antibacterial; Antioxidant; Activity.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000400024
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Experimental study of filtration activity in Ditrupa arietina (Annelida Polychaeta) using an automated image analysis system ArchiMer
Duchene, Jean Claude; Jordana, Esther; Charles, François; Gremare, Antoine; Amouroux, Jean Michel.
An automated image analysis system designed to assess the activity of benthic organisms is described. This system is used to study filtration in the serpulid polychaete Ditrupa arietina. The video sensor of the system is composed of a black and white charged coupled device, a microprocessor, a memory and an interface board. It is driven by real-time routines, which are downloaded in permanent memory prior to each experiment. These routines control picture acquisition frequency and compute the differences in grey levels between the image recorded at a given time and a reference image (corresponding to no filtration in the case of D. arietina). These differences are used to detect numerical objects, which are stored in the memory board. At the end of each...
Tipo: Text Palavras-chave: Polychètes; Analyse d'images; Activité; Filtration; Polychaetes; Image analysis; Activity; Filtration.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43377/42834.pdf
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Feet, heat and scallops: what is the cost of anthropogenic disturbance in bivalve aquaculture? ArchiMer
Robson, Anthony A.; Halsey, Lewis G.; Chauvaud, Laurent.
The effects of unnatural disturbances on the behaviour and energetics of animals are an important issue for conservation and commercial animal production. Biologging enables estimation of the energy costs of these disturbances, but not specifically the effect these costs have on growth; a key outcome measure for animal farming enterprises. We looked at how natural and anthropogenically induced activity and energy expenditure of king scallops Pecten maximus varies with temperature. These data were then used to model growth time of king scallops reared in an aquaculture facility under different temperatures and anthropogenic disturbance levels. The scallops exhibited a typical total metabolic rate (MR)-temperature curve, with a peak reached at a middling...
Tipo: Text Palavras-chave: Growth; Temperature; Anthropogenic disturbance; Activity; Metabolic rate; Energy expenditure.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00344/45561/72893.pdf
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First insight into personality traits in Northern pike (Esox lucius) larvae: a basis for behavioural studies of early life stages ArchiMer
Pasquet, Alain; Sebastian, Anthony; Begout, Marie-laure; Ledore, Yannick; Teletchea, Fabrice; Fontaine, Pascal.
Personality traits have been studied for some decades in fish species. Yet, most often, studies focused on juveniles or adults. Thus, very few studies tried to demonstrate that traits could also be found in fish larvae. In this study, we aimed at identifying personality traits in Northern pike (Exos lucius) larvae. Twenty first-feeding larvae aged 21 days post hatch (16.1 +/− 0.4 mm in total length, mean +/− SD) were used to establish personality traits with two tests: a maze and a novel object. These tests are generally used for evaluating the activity and exploration of specimens as well as their activity and boldness, respectively. The same Northern pike twenty larvae were challenged in the two tests. Their performances were measured by their activity,...
Tipo: Text Palavras-chave: Behavioural tests; Activity; Exploration; Boldness/shyness continuum; Freshwater species.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00296/40697/39756.pdf
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Impact of climate and moonlight on a venomous mammal, the Javan slow loris (Nycticebus javanicus Geoffroy, 1812) Naturalis
Rode-Margono, E.J.; Nekaris, K.A.-I..
Predation pressure, food availability, and activity may be affected by level of moonlight and climatic conditions. While many nocturnal mammals reduce activity at high lunar illumination to avoid predators (lunarphobia), most visually-oriented nocturnal primates and birds increase activity in bright nights (lunarphilia) to improve foraging efficiency. Similarly, weather conditions may influence activity level and foraging ability. We examined the response of Javan slow lorises (Nycticebus javanicus Geoffroy, 1812) to moonlight and temperature. We radio-tracked 12 animals in West Java, Indonesia, over 1.5 years, resulting in over 600 hours direct observations. We collected behavioural and environmental data including lunar illumination, number of human...
Tipo: Article / Letter to the editor Palavras-chave: Activity; Environmental factors; Humidity; Lunarphobia; Moon; Predation; Temperature; 42.84.
Ano: 2014 URL: http://www.repository.naturalis.nl/record/499291
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Implementación de un modelo de costos ABC en una empresa vitivinícola AgEcon
Contreras, H.; Mac Cawley, A..
Published by Asociación de Economistas Agrarios de Chile
Tipo: Journal Article Palavras-chave: ABC; Activity; Cost; Wine.; Farm Management.
Ano: 2006 URL: http://purl.umn.edu/97353
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Intertidal life: field observations on the clingfish Gobiesox barbatulus in southeastern Brazil Neotropical Ichthyology
Pires,Tiago H. S; Gibran,Fernando Z.
The clingfish Gobiesox barbatulus shows nocturnal feeding activity, spending most part of the day stationary and adhered to the inferior part of stones. To feed, this species uses the sit-and-wait and particulate feeding tactics. It shows a carnivorous feeding habit mostly consuming small benthic crustaceans. It can move in two ways: (1) "stone-by-stone", sliding its ventral sucker disc across each stone and (2) "surf", when it takes advantage of the energy of the ebbing tide to quickly cross a distance up to four times its body length. Its reproductive season occurs between the end of spring and the beginning of summer, during which time it lays about 2,000 adhesive eggs of 1 mm each in a single layer under stones. It has more than one egg-laying session...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activity; Microhabitat; Diet; Reproduction; Gobiesocidae.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100022
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