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  • 1
    Publication Date: 2017-04-04
    Description: Neolithic, Chalcolithic and Bronze Age anthropogenic cave sediments from three caves from northern Spain have been palaeomagnetically investigated. 662 oriented specimens corresponding to 39 burning events (ash–carbonaceous couplets) from the three sites with an average of 16 samples per fire were collected. 26 new archaeomagnetic directions have been obtained for the time period ranging from 5500 to 2000 yr cal. BC. These results represent the oldest archaeomagnetic directions obtained from burnt archaeological materials throughout all Western Europe. Magnetisation is carried by pseudo-single domain low-coercivity ferromagnetic minerals (magnetite, magnetite with no significant isomorphous substitution and/or maghaemite). Rock-magnetic experiments indicate a thermoremanent origin of the magnetisation although a thermochemical magnetisation cannot be excluded. Combination of the new data presented here and the recent updated Bulgarian database allows us to propose the first European palaeosecular variation (PSV) curve for the Neolithic. A bootstrap method was applied for the curve construction using penalised cubic B-splines in time. The new palaeosecular variation curve is well constrained from 6000 BC to 3700 BC, the period with the highest density of data, showing a declination maximum around 4700 BC and a minimum in inclination at 4300 BC, which are not recorded by the recent global CALS10K.1b and regional SCHA.DIF.8K models due to the use of lake sediment data. Dating resolution by using the proposed PSV curve oscillates from approximately ±30 yr to ±200 yr for the period 6000 to 1000 yr BC, reaching similar resolution as radiocarbon dating. Considering the good preservation, age-control and widespread occurrence of burnt archaeological materials across Southern Europe, they represent a new source of data for geomagnetic field modelling, as well as for archaeomagnetic dating.
    Description: Published
    Description: 124-137
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Description: restricted
    Keywords: secular variation ; archaeomagnetism ; rock-magnetism ; thermoremanence ; Neolithic ; archaeology ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals ; 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field ; 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism ; 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism ; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques ; 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Publication Date: 2021-05-19
    Description: Las colecciones microbianas son consideradas como centros de recursos genéticos que custodian dicho germoplasma, entre sus funciones principales se encuentra la conservación de los microorganismos, lo que permite garantizar el suministro de cepas requerido para acometer actividades docentes, investigativas o productivas. En Cuba, tales curadores, se aglutinaron en el Grupo de Colecciones Microbianas, que durante el 2002 se constituyó como Sección de Colecciones Microbianas y otros Materiales Biológicos de la ATAC, alcanzando en la actualidad más de 100 asociados, que participan en reuniones trimestrales, cursos, adiestramientos y talleres, donde son discutidos los resultados del trabajo científico-técnico desarrollado en sus colecciones. Se comentan de modo general su inserción en las distintas esferas de la economía del país, los servicios que prestan, los métodos para la conservación de los microorganismos con que trabajan y otros aspectos de interés.
    Description: Published
    Keywords: Genetics ; Biological collections ; Genetics
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 3
    Publication Date: 2021-05-19
    Description: En el presente trabajo se evaluó la actividad biológica de 87 aislamientos de bacterias heterótrofas procedentes de la "Bahía de La Habana". El espectro de potencialidades mostró que el 29,9% de los mismos presentó actividad antimicrobiana frente a las cepas indicadoras empleadas. Un 63,2% presentó actividad caseinasa, el 44,8% mostró su actividad hemolítica y el 83,4% fue capaz de excretar compuestos con actividad superficial. Respecto a los mecanismos degradativos, el 57,5% de ellas, mostró preferencia por el petróleo como fuente de carbono y el 42,5% por los compuestos organoclorados. Se evidenció la amplia gama de actividades con Bioactividad de bacterias heterótrofas aplicación biotecnológica que poseen las bacterias heterótrofas aisladas de éste ecosistema altamente impactado.
    Description: In this paper we studied the biological activities on 87 heterotrophic bacteria isolated from "Bahía de La Habana". Their behavior showed that 29,9% had antimicrobial activity versus the indicator strains selected. Caseinase activity was present in 63,2% of the strains, haemolytic activity was detected in the 44,8% ones, whilst 83,4% were able to produce surfactants. Taking in account degradative mechanisms, 57,5% were oil degrading isolates and 42,5% preferred organic chlorinated compounds as carbon source. We found that the heterotrophic bacteria isolated from this highly impacted ecosystem had a broad spectrum of potentialities with several practical applications.
    Keywords: Bacteria ; Biological collections ; Geographical isolation ; Bacteria ; Heterotrophic organisms
    Repository Name: AquaDocs
    Type: Preprint
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