A Non-linear Singular Perturbation Problem Arising in the Study of Chemical Flow Reactors

This paper presents a method of obtaining the complete asymptoticsolution of boundary value problems of the form for x [0,1] where b(x) is strictly positive andfor small and positive. Physically, the problem arises in determiningthe steady-state concentration of a substance in a chemicalflow reactor. A "two-variable" expansion procedure is used.     

CELL MEMBRANE DNA: A NEW TARGET FOR PSORALEN PHOTOADDUCT FORMATION

The effects of 8-methoxypsoralen plus long wavelength ultraviolet radiation on cell membrane DNA were examined. Treatment of human lymphocytes with 100 ng/ml 8-methoxypsoralen and 5 J/cm2 UVA led to the formation of 7.1 +/- 3.8 photoadducts per million bases. A monoclonal antibody, specific for 8-methoxypsoralen 4',5'-monoadducts, was used to detect photoadducts in the cell membrane DNA of human lymphocytes and three lymphoblastoid cell lines. Treatment of lymphocytes with 8-MOP and UVA reduced the lymphocyte DNA binding capacity by 56%. Cell membranes of normal lymphocytes were shown to contain three high affinity DNA binding proteins of 28, 59, and 79 kDa, respectively.     

ChemInform Abstract: An ab initio Molecular Orbital Study of the Potential Energy Surface for the Orthosilicate Anion, (H3SiO4)-

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