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| Registros recuperados: 28 | |
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| 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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| 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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| 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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| Troiani,Estela de Pieri; Tropiani,Clariza Tomé; Clemente,Edmar. |
| The enzimatic activity of peroxidase (POD) and polyphenoloxidase (PPO) extracted from three grape cultivars (Vitis vinifera L.), cultivated in Marialva city, state of Paraná, was evaluated in this study. The enzymatic extracts were prepared starting from the Rubi, Borbon and Benitaka grape cultivars pulp and peel. The activity of the peroxidase was 53.00 units/100 g in the extract from the Rubi cultivar peel, and 327.00 units/100 g from the Benitaka cultivar, these values being superior to those observed in the same cultivars pulp extracts, which were 7.67 units/100 g and 44.00 units/100 g respectively. However, the result was opposite in the Borbon cultivar, with values of 141.11 units/100 g in the pulp and 11.50 units/100 g in the peel being found. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peroxidase; Polyphenoloxidase; Activity; Grape; Vitis vinifera. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542003000300019 |
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| Martínez Hernández, Abraham. |
| México cuenta con escasos estudios sobre el ocelote (Leopardus pardalis) a pesar de ser una especie en peligro de extinción. En el Estado de San Luis Potosí, se ha confirmado la presencia de poblaciones residentes y probablemente se encuentran en situación de riesgo debido a las intensas modificaciones del hábitat. Por esta razón es necesario generar información para conocer el estado actual de la población y para implementar estrategias efectivas de manejo para la conservación de esta especie en la región. El objetivo del estudio fue conocer la abundancia, densidad y los patrones de actividad del ocelote en la Reserva de la Biosfera Sierra del Abra Tanchipa, empleando un método de captura–recaptura con el uso de cámaras–trampa. El estudio se realizó de... |
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Palavras-chave: Leopardus pardalis; Cámaras-trampa; Abundancia; Densidad; Actividad; Camera-traps; Abundance; Density; Activity; Ganadería; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1909 |
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| Maehr, David S; University of Kentucky; dmaehr@uky.edu; Larkin, Jeffery L; ; jllark0@uky.edu; Cox, John J; ; coyote1701@yahoo.com. |
| A recent model of Florida panther (Puma concolor coryi) habitat erred in arbitrarily creating buffers around radio locations collected during daylight hours on the assumption that study animals were only at rest during these times. The buffers generated by this method likely cause an overestimation of the amounts and kinds of habitats that are used by the panther. This, and other errors, could lead to the impression that unfragmented forest cover is unimportant to panther conservation, and could encourage inaccurate characterizations of panther habitat. Previous 24-hour monitoring of activity and activity readings made during routine telemetry flights indicate that high levels of activity occur in the early morning hours. Literature on the behavior of the... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Activity; Florida panther; Habitat; Telemetry data. |
| Ano: 2004 |
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| Byrne, Nathalie; Strous, Marc; Crepeau, Valentin; Kartal, Boran; Birrien, Jean-louis; Schmid, Markus; Lesongeur, Francoise; Schouten, Stefan; Jaeschke, Andrea; Jetten, Mike; Prieur, Daniel; Godfroy, Anne. |
| Recent studies indicate that ammonia is an important electron donor for the oxidation of fixed nitrogen, both in the marine water column and sediments. This process, known as anammox, has so far only been observed in a large range of temperature habitats. The present study investigated the role of anammox in hydrothermal settings. During three oceanographic expeditions to the Mid-Atlantic Ridge, hydrothermal samples were collected from five vent sites, at depths ranging from 750 to 3650m from cold to hot habitats. Evidence for the occurrence of anammox in these particular habitats was demonstrated by concurrent surveys, including the amplification of 16S rRNA gene sequences related to known anammox bacteria, ladderanes lipids analysis and measurement of a... |
| Tipo: Text |
Palavras-chave: Hydrothermal vent; Ladderanes; 16S rRNA; Activity; Micro organisms; Anammox. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6921.pdf |
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| Jolivet, Aurelie; Chauvaud, Laurent; Thebault, Julien; Robson, Anthony A.; Dumas, Pascal; Amos, George; Lorrain, Anne. |
| Background : Behaviour and time spent active and inactive are key factors in animal ecology, with important consequences for bioenergetics. For the first time, here, we equipped the gastropod Tectus (= Trochus) niloticus with accelerometers to describe activity rhythms at two sites in the Southwest Pacific with different temperature regimes: New Caledonia and Vanuatu. Results : Based on a 24-hour cycle, T. niloticus activity began at dusk and gradually stopped during the night, before sunrise. This nocturnal behaviour was characterised by short (duration <30 s), low intensity (acceleration < 0.12 ɡ) movements and was probably associated with foraging behaviour. We assumed that activity ceased once the animal was satiated. Our analysis of two size... |
| Tipo: Text |
Palavras-chave: Activity; Accelerometry; 24-hour periodicity; Tectus niloticus; Foraging; Migration. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00295/40658/39640.pdf |
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| 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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| 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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| 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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| 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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| 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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| 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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| Registros recuperados: 28 | |
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