PHOTOMETRIC STUDY OF IC 2156

Photometric observations of the nucleus of IC 418

We discuss the observational characteristics of a recently proposed class of variable central stars of planetary nebulae. We summarize previous observations of the nucleus of IC 418, a prototype star of this class, and we analyze new photometry of this object, obtained in 1989 and 1991. We confirm that the characteristic timescale of the photometric variations is a fewhours.No single period can...

C3an36798c 2156..2162

We report observations of an intrinsic fluorescence in the visible range, which develops during the aggregation of a range of polypeptides, including the disease-related human peptides amyloid-b(1–40) and (1–42), lysozyme and tau. Characteristic fluorescence properties such as the emission lifetime and spectra were determined experimentally. This intrinsic fluorescence is independent of the pre...

2156 Cancer-induced blindness

C0an00101e 2150..2156

A new analytical method, pressurized capillary electrochromatography with indirect amperometric detection, has been developed for the determination of some non-electroactive organophosphorus pesticides (OPPs). When 0.1 mmol L 1 of 3,4-dihydroxybenzylamine (DHBA) was added to the mobile phase containing 50% v/v of ACN and 50% v/v of MES buffer (10 mmol L , pH 5.5), and +0.9 V (vs. Ag/AgCl) of wo...

Dev107011 2150..2156

Morphogen gradients guide the patterning of tissues and organs during the development of multicellular organisms. In many cases, morphogen signaling is also required for tissue growth. The consequences of this interplay between growth and patterning are not well understood. In the Drosophila wing imaginal disc, the morphogen Dpp guides patterning and is also required for tissue growth. In parti...