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.

Analysis of priority pollutants at a primary zinc production facility /

Mode of access: Internet.

Notes on the occurrence of lead, zinc and antimony ores in Mysore,

Mode of access: Internet.

Photoelectronic properties of zinc phosphide crystals, films and heterojunctions : quarterly progress report no. 6 for the period July 1 - September 30, 1980 /

The purpose of this research program is to investigate the photoelectronic properties of zinc phosphide (Zn₃P₂ in single crystal form, in thin-film form, and in heterojunctions in which Zn₃P₂ forms one of the elements. This research will be directed toward understanding the role of crystalline defects and impurities in Zn₃P₂, the nature of the electronic charge transport in single crystal and thin-film material, and the properties of photovoltaic heterojunctions involving Zn₃P₂. The scope of the program extends from basic investigations of materials properties on single crystals to the preparation and characterization of all-thin-film heterojunction divices. One of the principal motivations behind this research program is the realization that Zn₃P₂ is a relatively uninvestigated yet ideal component for photovoltaic heterojunction use in solar energy conversion. The proposed program will concentrate on the basic materials problems involved with Zn₃P₂, providing the kind of information needed for other more developmental programs directed toward actual practical cells.

Ambient water quality criteria for zinc /

Mode of access: Internet.

Control technology assessment : the secondary nonferrous smelting industry /

Mode of access: Internet.

Fate of zinc in natural surface waters ; final report /

"Supported by Division of Biology and Medicine, U.S. Atomic Energy Commission, research contract AT (11-1) 1264."

Zinc adsorption by precipitated iron on lake bottoms /

Includes bibliographical references (p. 32-34).

A survey of stable and radioactive zinc and cobalt in the Columbia River /

Thesis (M.S.)--University of Illinois, 1965.

Lead and zinc deposits of Northwestern Illinois,

Mode of access: Internet.

United States government specification for leaded zinc oxide, dry and paste /

1st edition issued with title : Recommended specifications for ...

Zinc and lead deposits of southeastern Alaska.

Includes bibliographical references.

Geology of parts of the upper Mississippi Valley zinc-lead district.

Issued as separate chapters A-I.