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.

Heat flow in the Black and Mediterranean seas

Results of heat-flow measurements in the western Black Sea and within the African-Sicilian region of the Mediterranean Sea are presented. New data reveal a well-defined correlation with the deep-seated geologic structure of the regions examined. A heat-flow anomaly within the Pantelleria graben, in the authors' opinion, is a consequence of connective heat transfer along channels of disjunctive faults.

(Table 1) Heat flow in the Red Sea rift zone at 18°N

New results of geothermal studies at 18°N in the Red Sea rift zone are discussed. It was established that the thermal field of the African plate in this area has a higher than ordinary level, and averages 3.0-3.5 UTF. Heat flow of the Arabian plate is characterized by negative anomalies and is local in character in comparison to adjoining areas of the rift.

Integrated traffic simulation model - phase I. Volume 4: revisions to the UTCS-1 traffic simulation model to enhance operational efficiency. Final report.

Federal Highway Administration, Washington, D.C.

NETGRAF: a computer graphics aid to the operation and interpretation of NETSIM, a traffic simulation model. Part 1: overview and experimental results. Final report.

Transportation Department, Office of University Research, Washington, D.C.

NETGRAF: a computer graphics aid to the operation and interpretation of NETSIM, a traffic simulation model. Part 3: programmer's guide.

Transportation Department, Office of University Research, Washington, D.C.

The antiquities of Palmyra : containing the history of the city and its emperors from its foundation to the present time : with an appendix of critical observations on the names, religion, and government of the country, and a commentary on the inscriptions lately found there.

Errata, last leaf.

Titles and documents relative to the seigniorial tenure, required by an address of the Legislative Assembly, 1851.

Another compilation with similar title was also published in 1852. The contents of the two volumes are different.

The official index to the Times.

Reprint of the original published in London by J.B. Bland, 1914-1916; by Times Pub. Co., 1917-1957.

Classified list of books added to the circulating department of the ... library. Jan. 1, 1896 - July 1, 1900.

Mode of access: Internet.

A review of the evidences of Christianity; in a series of lectures, delivered in Broadway hall, New York, August, 1829. To which is prefixed, an extract from Wyttenbach's Opuscula, on the ancient notices of the Jewish nation previous to the time of Alexander the Great.

Mode of access: Internet.

The history of Rome from the first Punic War to the death of Constantine /

Steel engraved portrait of Niebuhr by John Brain after Julius Schnorr.

Letters on masonry, addressed to the professed followers of Christ, now in connection with the institution of freemasonry. ...

Mode of access: Internet.

The trade of banking in England: embracing the substance of the evidence taken before the Secret Committee of the House of Commons, digested and arranged under appropriate heads. Together with a summary of the law applicable to the Bank of England, to private banks of issue, and joint-stock banking companies.

Mode of access: Internet.

Observations on the restrictive and prohibitory commercial system; especially with a reference to the decree of the Spanish Cortes of July 1820.

Mode of access: Internet.