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Determination of peptaibol trace amounts in marine sediments by liquid chromatography/electrospray ionization-ion trap-mass spectrometry ArchiMer
Poirier, Laurence; Amiard, Jean-claude; Mondeguer, Florence; Quiniou, Francoise; Ruiz, Nicolas; Pouchus, Yves Francois; Montagu, Monique.
Extraction followed by reverse phase liquid chromatography (LC)/electrospray ionization-ion trap-mass spectrometry (ESI-IT-MS) analysis has been successfully developed for the determination of peptaibols, fungal toxic metabolites, in marine sediments. Spiking experiments showed that the mean recovery of target compounds exceeded 85% at a spiking level of 10 ng/g of sediment (wet weight). Detection and quantification limits were 250 and 830 pg/g of sediment, respectively. The method developed constituted the first sensitive assay for quantification of peptaibol trace amounts in a natural environment. A concentration of 5 ng/g in sediment samples collected from Fier d'Ars was found.
Tipo: Text Palavras-chave: Matched calibration; Matrix; Electrospray ionization ion trap mass spectrometry ESI IT MS; Marine fungal contamination; Trichoderma sp.; Fungal peptide metabolites.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2990.pdf
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Fragment shape and size, landscape permeability and fragmentation level as predictors of primate occupancy in a region of Brazilian Cerrado Biological Sciences
Grande, Thallita Oliveira; Alencar, Raony Macedo; Ribeiro, Paulo Pinheiro; Melo, Fabiano Rodrigues.
Human activities result in the formation of a mosaic of forest patches within a non-habitat matrix. The response of the local biodiversity to changes in land-use may occur at different scales. It is important to evaluate the effects of the attributes of both the patches and the surrounding landscape on the occupancy of forest patches by animal populations. Here, we assessed the predictive potential of local (basal area, tree density), patch (size, shape) and landscape scale (total area of forest, number of patches, matrix permeability, patch proximity) variables on the occupancy of forest patches by the syntopic primates Alouatta caraya, Sapajus libidinosus and Callithrix penicillata in the city of Goiânia in the Cerrado region of central Brazil. We used...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Primate syntopy patch occupancy matrix forest fragmentation playback primate syntopy; Patch occupancy; Matrix; Forest fragmentation; Playback..
Ano: 2020 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/48339
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Interlinkages in the Tunica Media of Goat Aorta International Journal of Morphology
Ogeng'o,Julius; Malek,Adel Abdel; Kiama,Stephen.
The arrangement and interconnections between various components of the aortic wall influence its physicomechanical properties and functional alterations that occur in disease and ageing. The goat is a suitable model for studying cardiovascular disease, but details of the intrinsic organization of its aorta are unknown. This study therefore investigated the histomorphology of aortic tunica media in the goat by transmission electron microscopy. Sixteen healthy juvenile and adult domestic male goats (capra hircus) purchased from livestock farms in the outskirts of Nairobi were used in the study. The animals were euthanized with overdose of sodium pentabarbitone 20mg/kg, and fixed with 3% phosphate buffered glutaraldehyde solution by gravimetric perfusion....
Tipo: Journal article Palavras-chave: Matrix; Smooth muscle; Interlinkage; Aorta; Goat.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200013
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Misuse of Checklist Assessments in Endangered Species Recovery Efforts Ecology and Society
Good, Thomas P; National Marine Fisheries Service; tom.good@noaa.gov; Harms, Tamara K; Arizona State University; tamara.harms@asu.edu; Ruckelshaus, Mary H; National Marine Fisheries Service; mary.ruckelshaus@noaa.gov.
Natural resource agencies worldwide must develop species recovery plans that specify threats, propose targets required for recovery, and evaluate the extent to which habitat alteration and restoration may influence species decline and recovery. To evaluate the impacts of proposed habitat alterations on species of conservation concern, standardized protocols may be adopted even when supporting data are scarce. For example, a habitat matrix was developed by the National Marine Fisheries Service (NMFS) to guide consultations under the Endangered Species Act for actions that may affect the functioning of the freshwater habitat used by several federally listed salmonid species. The habitat matrix has also been advocated as a tool for recovery planning by...
Tipo: Peer-Reviewed Reports Palavras-chave: Checklists; Conservation; Endangered species; Habitat assessment; Proxy indicator; Salmonids; Matrix.
Ano: 2003
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