Birgit Siegel

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Inherited predisposition to cancer is a major contributor to the breast and ovarian cancer burden among people of Ashkenazi ancestry. Approximately 2.5% of all people of Ashkenazi Jewish descent carry one of three ancient (founder) mutations in BRCA1 or BRCA2 (185delAG or 5382insC in BRCA1 and 6174delT in BRCA2). In a recent population based study, 29% of(More)
The secretion of the hypertrophied metapleural gland of the antCrematogaster deformis contains a mixture of phenols, consisting mainly of 3-propylphenol, 3-pentylphenol, 3,4-dihydro-8-hydroxy-3-methylisocoumarin (mellein), 5-propylresorcinol, and 5-pentylresorcinol. The secretion is released, as a repellent, when the highly vulnerable petiolar-postpetiolar(More)
We have established an optimal condition for the synchronous digestion of SV40 DNA with Escherichia coli exonuclease III. Electron microscopy and polyacrylamide gel electrophoresis were used to obtain accurate measurements on the lengths of DNA before and after exonuclease III digestion. Based on this finding, a new method for determining the sequence of(More)
Neurodegeneration with brain iron accumulation (NBIA) defines a wide spectrum of clinical entities characterized by iron accumulation in specific regions of the brain, predominantly in the basal ganglia. We evaluated the presence of FA2H and C19orf12 mutations in a cohort of 46 Italian patients with early onset NBIA, which were negative for mutations in the(More)
We have determined the mode of cleavage of superhelical SV40 DNA (Form I) by restriction endonucleases EcoRI and HpaII at 37 degrees C. By analysis with agarose gel electrophoresis and direct examination with dark field electron microscopy, we found that a large amount of the single-nicked circular DNA (Form II) was produced before the linear SV40 DNA (Form(More)
Norepinephrine (NE) activates isolated coronary conduit arteries by stimulating Ca2+ uptake into the smooth muscle cells. Blockade of Ca2+ influx by removal of Ca2+ from the bathing medium or addition of 10 mM LaCl3 prevents the NE-induced contraction in the dog coronary artery but still allows NE to induce a rapid transient contraction in the rabbit aorta.(More)
BACKGROUND AND OBJECTIVE The aim of this study was to identify the expression of cyclooxygenase-1, cyclooxygenase-2, cyclooxygenase-3, and microsomal prostaglandin E synthase-1 in young and elderly subjects. MATERIAL AND METHODS Periodontally healthy subjects were divided into young (18-30 years, n = 7) and elderly (46-77 years, n = 7). A gingival biopsy(More)