Brian Horsfield

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In an earlier study of deep subsurface sediments from Nankai Trough (ODP Leg 190, offshore Japan) we employed intact phospholipids (PLs) as molecular indicators of living microorganisms. The current study extends this work by quantifying absolute amounts of sedimentary PLs by liquid chromatography-mass spectrometry (LC-MS) and by converting PL data into(More)
During cheese manufacture the moisture content of the curd must be carefully controlled. Curd moisture is usually measured by weighing and drying, which is a time consuming process. This paper describes progress in the development of microwave moisture sensing equipment suitable for the cheese industry. Results from a permittivity survey are described. A(More)
A thermal desorption GC/MS technique has been developed for the quantification of polycyclic aromatic hydrocarbons (PAHs) in airborne particulate matter using the NIST Standard Reference Material (SRM1649a) Urban Dust. The technique was developed using standard linearity tests in order to establish optimum sample weights and optimum desorption and(More)
Microbial activity in petroleum reservoirs has been implicated in a suite of detrimental effects including deterioration of petroleum quality, increases in oil sulfur content, biofouling of steel pipelines and other infrastructures, and well plugging. Here, we present a biogeochemical approach, using phospholipid fatty acids (PLFAs), for detecting viable(More)
With the growing understanding of human influence on the Earth system, an increasing number of scientific investigations focuses on vegetation responses to changing environmental and/ or climatic conditions. A detailed prediction, how e.g. increasing atmospheric temperatures affect the composition of terrestrial and aquatic vegetation composition, however,(More)
There is a demand in the dairy industry for instruments which can provide real-time information about the moisture content of cheese during manufacture. This paper describes progress in the development of microwave-based equipment for such an application. Results from a permittivity survey are described, and a six-port network is evaluated for use as a(More)
Four different geological sample types (a crude oil, a crude oil asphaltene, a reservoir core extract and a reservoir core asphaltene) have been characterized by negative ionization electrospray mass spectrometry at low and high mass resolution using a double-focusing magnetic sector field mass spectrometer. The mass range, shape of the spectra and the(More)
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