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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Sensors and Actuators A: Physical 37-38 (1993), S. 410-414 
    ISSN: 0924-4247
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 290 (July 2005), p. 110-120 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The fracture and fatigue behaviour of a mullite/molybdenum composite is investigated.The attention is focused on the measurement of fracture toughness, KIc, on long through the thickness cracks by using SENB specimens, and on the growth of indentation cracks under static, monotonic and cyclic loads. Molybdenum was chosen to reinforce the mullite matrix because of the similar thermal expansion coefficients for both phases. It is essential to know and take into account the shape of the initial indentation cracks as well as the eccentricity change after extension under monotonic and cyclic stress. This study shows that, in mullite/molybdenum composites, static fatigue effects are negligible, but these composites are susceptible to mechanical degradation under cyclic loads. It is shown that the fatigue crack growth rate exhibits a high dependence on Kmax and that the fatigue sensitivity, defined as the ratio between fatigue crack growth rate threshold and KIc,is much lower than for other materials processed by powder metallurgy
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 290 (July 2005), p. 336-339 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Four point bending tests have been carried out on a thermal barrier coating (TBC)system, at room temperature. The TBC system consisted of a plasma sprayed Y-TZP top coat with 8 % in weight of Yttria, a bond coat of NiCrAlY and a Ni-based superalloy Inconel 625 as substrate. The TBC coating was deposited on both sides of the prismatic specimens. Efforts have been done in detecting the damage of the coating by means of Maltzbender et al [1] model
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2021-05-19
    Description: Daily topical application of the aqueous ethanolic extract of the marine sea grass, Thalassia testudinum, on mice skin exposed to UVB radiation resulted in a dose dependent recovery of the skin macroscopic alterations over a 6-day period. Maximal effect (90%) occurred at a dose of 240 μg/cm2, with no additional effects at higher doses. Bioassay-guided fractionation of the plant extract resulted in the isolation of thalassiolin B (1). Topical application of 1 (240 μg/cm2) markedly reduces skin UVB-induced damage. In addition, thalassiolin B scavenged 2,2-diphenyl-2-picrylhydrazyl radical with an EC50=100 μg/ml. These results suggest that thalassiolin B is responsible for the skin regenerating effects of the crude extract of T. testudinum
    Description: Published
    Description: Flavonoids, Thalassiolin B, DPPH scavenged, antioxidant activity, Skin regenerating activity, Thalassia testudinum
    Keywords: Chemistry ; Pharmacology ; Chemistry ; Pharmacology
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 5
    Publication Date: 2021-05-19
    Description: Las algas constituyen una fuente importante de compuestos de interés biomédico. En este estudio se presentan los resultados del pesquisaje realizado a extractos de 7 especies de algas en modelos de conducta exploratoria y convulsiones inducidas por choque eléctrico en ratones machos Balb-c y OF1 respectivamente, de 18-22 g de peso corporal; a dosis entre 40 - 1000 mg/Kg, v.o. (n= 10). Los resultados mostraron que la mayor dosis de los extractos de Dyctiota sp. y Turbinaria sp. disminuyeron significativamente la actividad exploratoria a un 34.9% y 41.6% respectivamente. El extracto de Sargassum sp. disminuyó significativamente la convulsión tónica inducida por el choque eléctrico a un 74.6 %. Estos resultados sugieren la presencia en estos extractos de compuestos con efectos sedante y anticonvulsivante. El extracto de Dyctiota sp. se evaluó en conducta motora y evitación activa en ratas hembras AXC de 200-250 g de peso corporal, así como en conducta exploratoria, laberinto en cruz, natación forzada y convulsiones inducidas por choque eléctrico en ratones machos Balb-c y OF1. Se ensayaron dosis entre 125-1000 mg/kg de peso. Las mayores dosis estudiadas produjeron una disminución de la conducta motora en ratas a 36% mientras que la actividad exploratoria se redujo a 14% en ratones. En el modelo de evitación activa a dosis de 125 y 250 mg/kg del extracto, se observó un enlentecimiento en el aprendizaje. Estos resultados sugieren un posible efecto sedante en este extracto lo que justifica el interés en continuar los estudios con esta especie por su posible interés terapéutico.
    Description: algas marinas, Sargassum sp., Dyctiota sp., Turbinaria sp.
    Repository Name: AquaDocs
    Type: Preprint
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  • 6
    Publication Date: 2021-05-19
    Description: Ha sido demostrado, por otros autores, que el alga Ulva fasciata Delile posee una actividad antioxidante promisoria y en el presente trabajo evaluamos si la actividad antioxidante de muestras de esta alga puede ser influenciada por la adsorción de metales, pesados y otros por parte del alga. U. fasciata fue colectada en tres zonas de las costas de la Ciudad de la Habana que presentan diferentes niveles de eutrofización: 1) la desembocadura del Río Quibú, un río que atraviesa una importante zona industrial de la capital cubana y en la cual la concentración de metales acumulados por el alga fue mayor; 2) la zona del Malecón habanero, que recibe la contaminación de la bahía de la Habana y del Río Almendares pero no de forma directa, donde presentó valores intermedios de la adsorción de metales y 3) la Playa Bacuranao, una zona turística con menor nivel de contaminación en sus aguas y donde el nivel de metales adsorbido por el alga fue menor. Los extractos obtenidos de las algas colectadas en la desembocadura del Río Quibú presentaron una mayor actividad antioxidante y menor fue la actividad de los obtenidos de las algas de la Playa Bacuranao, mientras que los extractos de las algas del Malecón habanero tuvieron una actividad intermedia.
    Description: Published
    Description: Actividad antioxidante, Ulva fasciata Delile
    Keywords: Marine environment ; Heavy metals ; Algae ; Algae ; Marine environment ; Heavy metals
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 7
    Publication Date: 2021-05-19
    Description: Las algas constituyen un recurso natural de gran variedad y abundancia en los arrecifes coralinos cubanos. En la literatura científica han sido descritos efectos de extractos y compuestos aislados de algas pardas sobre el Sistema Nervioso Central, entre ellos, acciones depresora, antidepresiva y anticonvulsivante. En este estudio se presentan los resultados obtenidos en la evaluación neurofarmacológica de los extractos etanólicos (10%) procedentes de las algas pardas: Dictyota pinnatifida y Turbinaria turbinata sobre la conducta exploratoria, tiempo de sueño inducido por tiopental y prueba de esconder esferas. Se utilizaron ratones, albinos, machos, de la línea OF-1, de peso corporal entre 18 y 22 gramos y se emplearon dosis de 40, 200 y 1000 mg/kg, por vía oral. Los extractos de D. pinnatifida (40 mg/kg) y T. Turbinata (200 y 1000mg/kg) disminuyeron significativamente la actividad exploratoria, lo cual pudiera relacionarse con la presencia de terpenos en los mismos. En la prueba de tiempo de sueño la dosis de 1000 mg/kg del extracto de D. pinnatifida produjo una potenciación significativa de su duración, mientras que la administración del extracto de T. turbinata no modificó la duración del tiempo de sueño pero aumentó significativamente el período de latencia (40 y 1000 mg/kg). En la prueba de esconder esferas, la dosis de 1000 mg/kg de ambos extractos disminuyó significativamente el número de esferas escondidas, lo que indica la presencia de compuestos con efecto ansiolítico. Los resultados sugieren que ambos extractos presentan efectos de sedación y ansiolíticos. Se discute el interés e importancia en continuar las investigaciones en esta temática.
    Description: The algae constitute a natural resource of great variety and abundance in the Cuban coralline reefs. In the scientific literature actions of extracts and isolated compounds of brown algae have been described on the Nervous System, among them, depressant, antidepressive and anticonvulsivant effects. In this study the results obtained in the neuropharmacological evaluation of ethanolic extracts (10%) coming from brown algae: Dictyota pinnatifida and Turbinaria turbinata are presented. The models employees were the following ones: exploratory behavior, sleeping time induced by thiopental and marble burying test. Groups of 10 mice albino males were used, (OF-1 line, 18-22 g of corporal weight). The extracts of D. pinnatifida (40 mg/kg) and T. Turbinata (200 and 1000mg/kg) diminished significantly the exploratory activity, and this effect could be related with the presence of terpens in the same ones. In the test of sleeping time induced by thiopental the dose of 1000 mg/kg of the extract of D. pinnatifida produced a significant potentiation of its duration, while the administration of the extract of T. turbinata didn't modify the duration of the sleeping time but it increased significantly the period of latency (40 and 1000 mg/kg. In the marble burying test, the dose of 1000 mg/kg of both extracts diminished the number of hidden spheres significantly, suggesting an anxiolytic effect. It is discussed the interest and importance in continuing the investigations in this field.
    Description: Brown Algae, exploratory behavior; Sleeping time; Marble burying test; Anxiolytic; Dictyota pinnatifida; Turbinaria turbinata.
    Repository Name: AquaDocs
    Type: Preprint
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  • 8
    Publication Date: 2019-11-01
    Print ISSN: 1742-6588
    Electronic ISSN: 1742-6596
    Topics: Physics
    Published by Institute of Physics
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  • 9
  • 10
    Publication Date: 2014-11-07
    Description: Motivation: Mapping of high-throughput sequencing data and other bulk sequence comparison applications have motivated a search for high-efficiency sequence alignment algorithms. The bit-parallel approach represents individual cells in an alignment scoring matrix as bits in computer words and emulates the calculation of scores by a series of logic operations composed of AND, OR, XOR, complement, shift and addition. Bit-parallelism has been successfully applied to the longest common subsequence (LCS) and edit-distance problems, producing fast algorithms in practice. Results: We have developed BitPAl, a bit-parallel algorithm for general, integer-scoring global alignment. Integer-scoring schemes assign integer weights for match, mismatch and insertion/deletion. The BitPAl method uses structural properties in the relationship between adjacent scores in the scoring matrix to construct classes of efficient algorithms, each designed for a particular set of weights. In timed tests, we show that BitPAl runs 7–25 times faster than a standard iterative algorithm. Availability and implementation: Source code is freely available for download at http://lobstah.bu.edu/BitPAl/BitPAl.html . BitPAl is implemented in C and runs on all major operating systems. Contact : jloving@bu.edu or yhernand@bu.edu or gbenson@bu.edu Supplementary information : Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
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