(Table 1) Boron concentration and d11B ratios of ODP Hole 130-803D

The pH of the surface ocean is a sensitive function of its alkalinity and total inorganic carbon concentration, properties which also control the partial pressure of atmospheric carbon dioxide (Broecker and Peng, 1982). Thus, an accurate proxy for past ocean pH could yield information about variations in atmospheric CO2. Recently, it has been suggested that the boron isotopic composition of foraminiferal tests depends on the pH of sea water as well as its isotopic composition (Vengosh et al., 1991, doi:10.1016/0016-7037(91)90139-V; Hemming and Hanson, 1992, doi:10.1016/0016-7037(92)90151-8). Here we present boron isotope and elemental data for sedimentary pore fluids and isotope data for bulk foraminiferal samples from a deep-sea sediment core. The composition of the pore waters implies that sea water boron concentrations and isotopic composition have been constant during the past 21 Myr, allowing us to reconstruct past ocean pH directly from the foraminiferal isotope data. We find that 21 Myr ago, surface ocean pH was only 7.4 ±0.2, but it then increased to 8.2 ±0.2 (roughly the present value) about 7.5 Myr ago. This is consistent with suggestions (Popp et al., 1989; Cerling, 1991; Arthur et al., 1991) that atmospheric CO2 concentrations may have been much higher 21 Myr ago than today.

Chemistry of boron and boron compounds : a literature search /

"January 1959."

Boron triflouride neutron detector for low neutron intensities /

"LADC 60"

Amorphous boron-silicon-hydrogen alloys for thin films heterojunction solar-cell : quarterly technical progress report no. 1 for June 1 - August 31, 1970 /

"Work Performed Under Contract No. AC02-77CH00178."

Some empirical-theoretical considerations of uranium nitride in zirconium /

In this paper our method is critically examined to obtain a better understanding of the complexities of the system.

Nuclear safety measurements on systems containing boron and enriched uranium /

"U.S. Atomic Energy Commission Contract AT(29-1)-1106."

Corrosion studies on 304 stainless steel containing one percent boron-10 /

"U.S. Atomic Energy Commission Contract AT(29-1)-1106."

Boron /

Work done by the National Bureau of Standards, Washington, D.C.

Boron in agriculture.

Includes bibliographical references.

Nuclear safety experiments on plutonium and enriched uranium hydrogen moderated assemblies containing boron /

"Date Distributed: October 13, 1960."

Plasma torch production of elemental boron

On cover: AEC research and development report.

Tables for calculating the cubic contents of excavations and embankments.

Mode of access: Internet.

An elementary treatise on cubic and quartic curves,

Mode of access: Internet.

The root extractor, exhibiting new rules and processes, for the formation and the resolution of equations of all orders in algebra; and for the evolution of the roots of any power in numbers: serving likewise as a key to all the examples of the cubic and higher equations in Bonnycastle's introduction to algebra.

Mode of access: Internet.