Effect of locally increased zinc contents on zinc transport from the flag leaf lamina to the maturing grains of wheat

From previous experiments, it was evident that the accumulation of zinc in maturing wheat grains is highly regulated, but the regulatory mechanisms involved are not yet identified. In this study, we determined the transfer of radiolabelled zinc (fed directly into a leaf flap) from the flag leaf lamina to the grains. We also determined how this zinc transfer was affected by feeding additional unlabeled zinc (1 μmol per plant) either into the flag leaf sheath or the peduncle. Most of the 65Zn was retained in the feeding flap. A high percentage of the zinc exported from the flap accumulated in the grains with little accumulation of radiolabel in the other parts of the shoot. Unlabeled zinc remained mainly in the feeding flap and in the parts reached by the transpiration stream from the feeding position. The transfer of radiolabelled zinc was essentially not influenced by unlabeled zinc fed into another plant part. Our results suggest that the loading of zinc into the phloem and the mass flow in the sieve tubes might regulate zinc redistribution within the wheat shoot.

Chemical and isotopic compositions of hydrothermal manifestations and minerals from the Broken Spur hydrothermal field

A representative collection of hydrothermal manifestations was sampled practically from all hydrothermal mounds of the Broken Spur hydrothermal vent field with use of the Mir manned submersibles during three cruises of R/V Akademik Mstislav Keldysh. Mineral associations characteristic for different morphological types of sulfide ores from hydrothermal pipes, plates, and diffusers are assessed. Particular attention is paid to distribution of minor elements and their distribution patterns determined by mineralogical zonation. Measured isotopic composition of sulfur in sulfide minerals varies from 0.4 to 5.2 per mil that indicates their similarity with ores from the Snake Pit vent field and is related to dilution of hot ore-bearing solutions by seawater and reduction of water sulfate ions to H2S with heavy isotopic composition.

Alegatos que presentan ante la Suprema Corte de Justicia de la Nación las siguentes compañías y personas, Compañía Transcontinental de Petróleo S.A., International Petroleum Company, Huasteca Petroleum Company, Tuxpan Petroleum Company, Compañía Mexicana de Petróleo S.A., Tamiahua Petroleum Company, Señores Doheny & Bridge, The Texas Company of México, La Atlántica, New England Fuel Oil Company, Pánuco-Boston Oil Company, Mexican Gulf Oil Company, Continental Mexican Petroleum Company, Gompañía [sic] de Petróleo "La Corona", Compañía Petrolera Tal Vez, Compañía Terminal de Productores, Scotish [sic] Mexican Oil Company, Charles F. de Ganahl, El Azadón Company, Soledad Oil Company, Piedras Development Company, Tancochin Oil Company, Lot Seventeen, Malcon Anderson Company, George L. Christie, Seabord Fuel Company, Tamalin Oil Company, Juanedo Oil Company, Compañía Indiana y El Tigre, Compañía Agrícola Pretrolera [sic] Mexicana, Compañía

Mode of access: Internet.

La epopeya de la gloria, a los señores jefes y oficiales del bizarro batallón "General Córdova" en el día de la bendición y jura de la bandera el 24 de mayo de 1917.

Cover title.

Alegato presentado a la Sala 1a. de la Corte de Apelaciones como abogado de los señores Rösing Brothers & Co. [et al]

At head of title: La cuestión "R. Samper y Cía".

Phares: France, côtes nord et ouest; Espagne et Portugal, côtes nord, ouest et sud-ouest ; Iles Açores, Madère et Canaries. Collationnés et corrigés au 1er mars 1901 par le Service des Instructions Nautiques...

At head of title: Etat-major général de la marine. Service hydrographique, série C, n° 218.

Alegato que Fernando Velez, apoderado del gobierno : presenta al Tribunal de arbitramento que debe dirimir las diferencias relativas a los contratos sobre el Ferrocarril de Antioquia celebrados con los Señores Punchard, Mc Taggart, Lowther & Ca., 1895.

"Partes contratantes, los Señores Punchard, McTaggart, Lowther & ca., de un lado, y el gobierno de Colombia del otro."

Analysis of priority pollutants at a primary zinc production facility /

Mode of access: Internet.