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Rapid microalgal metabolism of selenate to volatile dimethylselenide.
Plant Cell Environ
June 2003
Division of Agricultural Engineering, Faculty of Civil and Environmental Engineering, Technion Israel Institute of Technology, Haifa 32000, Israel, Department of Plant and Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720-3102, USA and Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, MS 69, 2575 Sand Hill Road, Menlo Park, CA 94025-7015, USA.
An axenically cultured isolate of single-celled freshwater microalgae (Chlorella sp.) metabolized toxic selenate to volatile dimethylselenide at exceptionally high rates when transferred from mineral-nutrient solution to water for 24 h. The Se-volatilization rates were orders of magnitude higher than those similarly measured for wetland macroalgae and higher plants.
View Article and Find Full Text PDFThe enhancement of periosteal chondrogenesis in organ culture by dynamic fluid pressure.
J Orthop Res
July 2001
Cartilage and Connective Tissue Research Laboratory, Mayo Clinic, Rochester, MN 55905, USA.
Cartilage repair by autologous periosteal arthroplasty is enhanced by continuous passive motion (CPM) of the joint after transplantation of the periosteal graft. However, the mechanisms by which CPM stimulate chondrogenesis are unknown. Based on the observation that an oscillating intra-synovial pressure fluctuation has been reported to occur during CPM (0.
View Article and Find Full Text PDFEnhanced channelling of sulphate through a rapidly exchangeable sulphate pool in response to stimulated glycosaminoglycan synthesis in pancreatic epithelial cells.
Biochim Biophys Acta
July 1999
Department of Chemical Pathology, Women's and Children's Hospital, Adelaide, SA 5006, Australia.
The ability of cells to decorate glycosaminoglycans (GAGs) with sulphate in highly specific patterns is important to extracellular matrix biogenesis and placing appropriate glycosulphated ligands on the cell surface. We have examined sulphate metabolism in two pancreatic duct epithelial cell lines - PANC-1 and CFPAC-1 (derived from a cystic fibrosis patient) with a view to understanding how pancreatic cells utilise intracellular sulphate. [35S]Sulphate uptake was rapid and reached near steady state levels within 10 min.
View Article and Find Full Text PDFBiosynthesis of mucins in bovine trachea: identification of the major radiolabelled species.
Biochem J
July 1998
Department of Cell and Molecular Biology, Section for Molecular Pathogenesis, Lund University, Lund, P.O. Box 94, S-22100 Sweden.
Bovine trachea in organ culture secretes mucus containing a 'high-density' (1.46 g/ml) and a 'low-density' (1.37 g/ml) mucin similar to those identified previously in bovine respiratory secretions [Hovenberg, Carlstedt and Davies (1997) Biochem.
View Article and Find Full Text PDFProteoglycans in macrophages: characterization and possible role in the cellular uptake of lipoproteins.
Biochem J
May 1998
Institute for Nutrition Research, University of Oslo, Box 1046 Blindern, 0316 Oslo, Norway.
The murine macrophage cell line J774 was incubated with [35S]sulphate. The cell-associated 35S-labelled macromolecules were shown to be proteoglycans and glycosaminoglycans in similar amounts. The possible presence of cell-surface proteoglycans was investigated by incubating [35S]sulphate-labelled cells with trypsin for 15 min.
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