Prodigious submarine landslides during the inception and early growth of volcanic islands

Volcanic island inception applies large stresses as the ocean crust domes in response to magma ascension and is loaded by eruption of lavas. There is currently limited information on when volcanic islands are initiated on the seafloor, and no information regarding the seafloor instabilities island inception may cause. The deep sea Madeira Abyssal Plain contains a 43 million year history of turbidites among which many originate from mass movements in the Canary Islands. Here, we investigate the composition and timing of a distinctive group of turbidites that we suggest represent a new unique record of large-volume submarine landslides triggered during the inception, submarine shield growth, and final subaerial emergence of the Canary Islands. These slides are predominantly multi-stage and yet represent among the largest mass movements on the Earth’s surface up to three or more-times larger than subaerial Canary Islands flank collapses. Thus whilst these deposits provide invaluable information on ocean island geodynamics they also represent a significant, and as yet unaccounted, marine geohazard

Detection of cell proliferation in pig testis and intestine sections using monoclonal anti-bromodeoxyuridine antibody and immunogold silver staining

For the first time a monoclonal antibody against 5-bromodeoxyuridine was used to detect cell proliferation in pig testis and intestine sections. The influence of several parameters such as mode of injection, addition of thymidine biosynthesis inhibitor, tissue fixation, hydrolysis and revelation was examined. The technique of choice consisted in intravenously injecting the animals with 50 mg/kg BUdR added to 10 mg/kg FUdR 2 h before tissue collection and Bouin fixation; hydrolysis of sections was performed by HCl 4N: Ethanol 70° (1:1 v/v); revelation of BUdR was made by a secondary antibody linked to colloidal gold particles, followed by a silver enhancement step. The data were superior when compared to those obtained by direct immunofluorescence and by the PAP technique. The described method is convenient and sensitive, provides an intense nuclear labelling without background and allows simultaneous examination of histology. The advantages over the technique using tritiated thymidine are particularly obvious when fast screening of numerous samples is required or when new experimental protocols are developping. © 1988 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Size-Dependent Scavenging Efficiencies of Multicomponent Armospheric Aerosols in Clouds.

Abstract not availableJRC.H-Institute for environment and sustainability (Ispra

Development of a specific radioimmunoassay for the detection of clenbuterol residues in treated cattle

A radioimmunoassay for clenbuterol detection in cattle has been validated and used to monitor treated cattle. The tracer used was 4-amino-3,5-dichloro-α (tert-butylaminomethyl) benzyl alcohol (benzyl-3H) (clenbuterol) prepared by catalytic tritiation with tritium gas of 4-amino-3,5-dibromo-α-(tert-butylamino)-acetophenone, followed by chlorination at positions 3 and 5 in the aromatic ring. The rabbit antiserum was raised against a diazotized clenbuterol/human serum albumin conjugate. The assay described was sensitive (7.8 pg/tube) and reproducible. The intra- and inter-assay variability, which was assessed by measuring known quantities of clenbuterol in plasma, urine and faeces, was satisfactory for RIA. When this assay was used to monitor treated cattle the concentrations of clenbuterol in plasma, urine and faeces were directly related to the administered dose. The absorption and elimination of clenbuterol in cattle was rapid. Data obtained were consistent with results obtained in other species where a rapid clearance rate was also demonstrated. © 1991 Taylor & Francis Group, LLC.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

European Organization For Nuclear Research

The two--jet invariant mass spectrum as measured in the UA2 experiment is used to search for additional heavy vector bosons decaying to two--jets. The mass of an additional W boson that couples to fermions with a V +A form is constrained to be greater than 261 GeV to the 90% confidence level. A limit on the production cross section of additional W and Z bosons is given as a function of the boson mass. A limit on the production of excited quarks is also given as a function of the excited quark mass. 1 Laboratorium fur Hochenergiephysik, Universitat Bern, Sidlerstraße 5, 3012 Bern, Switzerland 2 Cavendish Laboratory, University of Cambridge, CB3 0HE, UK 3 CERN, 1211 Geneva 23, Switzerland 4 Lehrstuhl fur Exp. Physik IV, Universitat Dortmund, 4600 Dortmund, Germany 5 Institut fur Hochenergiephysik der Universitat Heidelberg, Schroderstraße 90, 6900 Heidelberg, Germany 6 School of Physics, University of Melbourne, Parkville 3052, Australia 7 Dipartimento di Fisica dell'Univers..

Formation and Cycling of Aerosols in the Global Troposphere.

Abstract not availableJRC.(EI)-Environment Institut