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 coastal sediment transport processes from Wrightsville Beach to Fort Fisher, North Carolina /

A comprehensive engineering analysis of the coastal sediment transport processes along a 42-kilometer segment of the North Carolina shoreline from Wrightsville Beach to Fort Fisher is presented. Included in the analysis is an interpretation of the littoral processes, longshore transport, and the behavior and success of beach nourishment projects at Wrightsville Beach and Carolina Beach, North Carolina. The historical position of the MLW, MSL, and MHW contours, relative to a fixed base line, is plotted for the period between 1964 and 1975. An equivalent volumetric erosion or accretion between successive surveys is determined by multiplying the average excursion distance of the contours by a constant of proportionality. The plots of excursion distance versus time for the MLW, MSL, and MHW contours also show the time response of the beach fills. This response is described by a mathematical function. The alongshore components of wave-induced energy flux are also determined within the study area through wave refraction analysis. This information, together with the information on volumetric change, is used in a sediment budget analysis to determine the coefficient of alongshore sediment transport and the inlet trapping characteristics. (Author).

A numerical model to simulate sediment transport in the vicinity of coastal structures /

Cover title.

A user's guide to the N-line model : a numerical model to simulate sediment transport in the vicinity of coastal structures /

"August 1987."

Regulations governing the inspection, humane handling, and safe transport of animals carried by ocean steamers from the United States to foreign countries.

Mode of access: Internet.

The development of a numerical solution to transport equation /

"Prepared for U.S. Army Engineer District, Mobile."

Specifications for the beam transport systems to end Stations A and B /

"June 1964."

Matrix methods to analyze long-range transport of air pollutants.

"DOE/EV-0127."

Certain inducements to well minded people who are here straitned in their estates or otherwise; or, such as are willing, out of noble and publike principles, to transport themselves or some servants, or agents for them into the West Indies, for the propagating of the gospel and increase of trade ...

"No. 20, edition 250 copies, of which 50 are on large paper."

Sediment transport by irrigation return flows in four small drains within the DID-18 drainage of the Sulphur Creek Basin, Yakima County, Washington, April 1979 to October 1981 /

Mode of access: Internet.

Transport requirements for the growth of Northwest North America. Letter from the Chairman, Alaska International Rail and Highway Commission, transmitting the final report pursuant to Public law 884, 84th Congress. Referred to the Committee on Interior and Insular Affairs.

Mode of access: Internet.

Transport coefficients of air to 8000° K /

"29 September 1958."

A handbook to the cases illustrating simple means of travel & transport by land and water.

Mode of access: Internet.

Report to the Minister of Transport upon the accidents which occurred on the railways of Great Britain ...

Mode of access: Internet.

Essays and letters on subjects conducive to the improvement and extension of inland communication and transport.

Mode of access: Internet.