Strain Fi Research Articles

A note on gradient elasticity and nonsingular crack fields

No abstract available.

Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfide deposit, SW Iberia: A multidisciplinary approach

Research Article| May 01, 2010 Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfide deposit, SW Iberia: A multidisciplinary approach Rubén Piña; Rubén Piña † 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain †E-mail: rpinagar@geo.ucm.es Search for other works by this author on: GSW Google Scholar Ignacio Romeo; Ignacio Romeo 2Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Lorena Ortega; Lorena Ortega 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Rosario Lunar; Rosario Lunar 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Ramón Capote; Ramón Capote 2Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Fernando Gervilla; Fernando Gervilla 3Departamento de Mineralogía y Petrología, Facultad de Ciencias, Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada–Consejo Superior de Investigaciones Científicas (CSIC), 18071 Granada, Spain Search for other works by this author on: GSW Google Scholar Rosa Tejero; Rosa Tejero 2Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Cecilio Quesada Cecilio Quesada 4Instituto Geológico y Minero de España, Ríos Rosas 23, 28003 Madrid, Spain Search for other works by this author on: GSW Google Scholar GSA Bulletin (2010) 122 (5-6): 915–925. https://doi.org/10.1130/B30046.1 Article history received: 03 Mar 2009 rev-recd: 29 Jun 2009 accepted: 06 Jul 2009 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Rubén Piña, Ignacio Romeo, Lorena Ortega, Rosario Lunar, Ramón Capote, Fernando Gervilla, Rosa Tejero, Cecilio Quesada; Origin and emplacement of the Aguablanca magmatic Ni-Cu-(PGE) sulfide deposit, SW Iberia: A multidisciplinary approach. GSA Bulletin 2010;; 122 (5-6): 915–925. doi: https://doi.org/10.1130/B30046.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract A model is proposed for the origin and emplacement of the ca. 341 Ma Aguablanca magmatic Ni-Cu-(platinum group element [PGE]) sulfide deposit (SW Iberia) integrating petrological, geochemical, structural, and geophysical data. The Aguablanca deposit occurs in an unusual geodynamic context for this ore type (an active plate margin) as an exotic , magmatic subvertical breccia located at the northern part of the coeval gabbronorite Aguablanca stock (341 ± 1.5 Ma). Structural and gravity data show that mineralized breccia occurs inside the inferred feeder zone for the stock adjacent to the Cherneca ductile shear zone, a Variscan sinistral transpressional structure. The orientation of the feeder zone corresponds to that expected for tensional fractures formed within the strain field of the adjacent Cherneca ductile shear. Two distinctive stages are established for the origin and emplacement of the deposit: (1) initially, the ore-forming processes are attributed to magma emplacement in the crust, assimilation of crustal S, and segregation and gravitational settling of sulfide melt (a scenario similar to most plutonic Ni-Cu sulfide ores), and (2) final emplacement of the Ni-Cu sulfide-bearing rocks by multiple melt injections controlled by successive opening events of tensional fractures related to the Cherneca ductile shear zone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Cloning, expression, and characterization of a chitinase gene from the Antarctic psychrotolerant bacterium Vibrio sp. strain Fi:7.

A marine psychrotolerant bacterium from the Antarctic Ocean showing high chitinolytic activity on chitin agar at 5 degrees C was isolated. The sequencing of the 16S rRNA indicates taxonomic affiliation of the isolate Fi:7 to the genus Vibrio. By chitinase activity screening of a genomic DNA library of Vibrio sp. strain Fi:7 in Escherichia coli, three chitinolytic clones could be isolated. Sequencing revealed, for two of these clones, the same open reading frame of 2,189 nt corresponding to a protein of 79.4 kDa. The deduced amino acid sequence of the open reading frame showed homology of 82% to the chitinase ChiA from Vibrio harveyi. The chitinase of isolate Fi:7 contains a signal peptide of 26 amino acids. Sequence alignment with known chitinases showed that the enzyme has a chitin-binding domain and a catalytic domain typical of other bacterial chitinases. The chitinase ChiA of isolate Fi:7 was overexpressed in E. coli BL21(DE3) and purified by anion-exchange and hydrophobic interaction chromatography. Maximal enzymatic activity was observed at a temperature of 35 degrees C and pH 8. Activity of the chitinase at 5 degrees C was 40% of that observed at 35 degrees C. Among the main cations contained in seawater, i.e., Na+, K+, Ca2+, and Mg2+, the enzymatic activity of ChiA could be enhanced twofold by the addition of Ca2+.

Sexual hybrids ofAzolla filiculoideswithA. microphylla

Abstract Sexual hybrids of Azolla microphylla with A. filiculoides were reported previously. The reciprocal cross—A. filiculoides with A. microphylla was made. Among 114 crosses, eventually 9 populations survived. Hybridization was confirmed by the isozyme patterns and monoclonal antibody specific to cyano-symbiont of A. filiculoides. One of them (IRRI Accession No. FI 1064) was found to be non-hybrid. Five strains (FI 1066–1070) grew poorly and were pale green at the initial stage of the sporophyte growth with symbiotic cyano-bacteria inside and outside leaf cavities. Cyano-symbionts eventually entered in the leaf cavities, or lost (FI 1070). Three strains (FI 1062, FI 1063, FI 1065) grew apparently normally, but two of them were devoid of cyano-symbionts (FI 1062, 1063). Strain FI 1065 grew as good as both parents at 26/18°C, but strains FI 1066–1069 produced 50% less biomass than both the parents. Their acetylene reduction activity was 20% less than the parents, resulting in the higher N contents than ...