Silvana Siebert

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In order to specify the role of the periaqueductal grey (PAG) in vocal production, we tested the effect of PAG inactivation on the electrical elicitability of vocalization from various brain structures in the squirrel monkey. For this purpose, we implanted stimulation electrodes at 64 vocalization-eliciting sites throughout the brain and compared the(More)
In developing radioiodinated agents for pancreatic and brain tumor imaging by single photon emission tomography (SPET), we prepared p-amino-3-[123I]iodo-l-phenylalanine (IAPA), p-[123I]iodo-l-phenylalanine (IPA), L-8-[123I]iodo-1,2,3,4-tetrahydro-7-hydroxyisoquinoline-3-carboxylic acid (ITIC) and L-3-[123I]iodo-alpha-methyl-tyrosine (IMT) in radiochemical(More)
Human granulosa cell (GC)-tumors are assumed to arise from ovarian GCs but to what extent they resemble normal human GCs is not well established. We examined whether a prominent feature of normal GCs, expression of the major gap junctional protein connexin 43 (Cx43), was retained in 14 human GC-tumor samples. Immunohistochemistry revealed areas of strong(More)
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