A sensitive method was proposed and optimized for the determination of total mercury in fish tissue by using wet digestion, followed by cold vapor atomic absorption spectrometry (CVAAS) at the main resonance line of mercury (184.9 nm). The measurements were made using a new type of a non-dispersive mercury minianalyzer. This instrument was initially designed and built for atmospheric mercury-va...

we all, that it could be that steering through nearly 600 pages of text is worth while.1 Historically feudalism and a landowning aristocracy throughout Europe proved unable to cope with the rise of the expanding and commercial system of towns and cities. 2-3 In the great wide world there arose two mutually antagonistic systems: entrepreneurial capitalism and organised labour. Perkin further sug...

1. Experimental conditions have been found in which small amounts of methanol (approximately 2.5mm) accumulated when washed cell suspensions of methane-grown Pseudomonas methanica and Methanomonas methanooxidans were incubated with methane+oxygen mixtures in Warburg flasks. 2. The methanol formed could be separated completely from water by fractional distillation through glass helices followed ...

A second, monoclinic, polymorph of the title compound, C(14)H(8)Cl(2), has been found. In addition to the structure of this monoclinic form, the structure of the previously described orthorhombic form [Desvergne, Chekpo & Bouas-Laurent (1978). J. Chem. Soc. Perkin Trans. 2, pp. 84-87; Benites, Maverick & Fronczek (1996). Acta Cryst. C52, 647-648] has been redetermined at low temperature and usi...

A new polymorph of 2-(benzotriazol-2-yl)acetic acid, C(8)H(7)N(3)O(2), crystallizes in the space group C2/c (Z = 8). The non-planar mol-ecule has a synplanar conformation of the carb-oxy group. The crystal structure features helices parallel to the b axis sustained by O-H⋯N hydrogen bonding which are similar to those in the known polymorph [Giordano & Zagari (1978 ▶). J. Chem. Soc. Perkin Trans...

Melting points were obtained on Veego VMP-1 apparatus in open capillary tubes and are uncorrected. The reactions were monitored by TLC on silica gel thin layer plates. Compounds were analyzed for C, H, N and analytical results obtained for these elements were within ±0.5% of the calculated values for the formula shown. IR spectra were obtained using a Perkin Elmer spectrum-2 FT-IR spectrometer....

The title compound, C(19)H(16)N(2)O(2)S, was synthesized from furoyl isothio-cyanate and N-benzyl-aniline in dry acetone and the structure redetermined. The structure [Otazo-Sánchez et al. (2001 ▶). J. Chem. Soc. Perkin Trans. 2, pp. 2211-2218] has been re-determined in order to establish the intramolecular and intermolecular inter-actions. The thio-urea group is in the thio-amide form. The thi...

A hydride generation atomic absorption spectrometry method for arsenic determination in biological material was prepared. The samples were digested in muffle furnace at 550oC. The ash was dissolved in 4.5 N hydrochloric acid and the final solution was diluted in 10% hydrochloric acid. The arsenic was determined using a Perkin-Elmer atomic absorption spectrometer equipped with electrodeless disc...

1 Department of Research and Development, Hospira Inc., Lake Forest, Illinois, USA, 2 Department of Medical Ethics, University of Pennsylvania, Philadelphia, Pennsylvania, USA, 3 Advanced Centre for Biochemical Engineering, University College London, London, UK, 4 The Stop ALD Foundation, Houston, Texas, USA, 5 Interdisciplinary Oncology Program, H. Lee Moffi tt Cancer Center & Research Institu...

MOTIVATION Given inputs extracted from an aligned column of DNA bases and the underlying Perkin Elmer Applied Biosystems (ABI) fluorescent traces, our goal is to train a neural network to determine correctly the consensus base for the column. Choosing an appropriate network input representation is critical to success in this task. We empirically compare five representations; one uses only base ...