A tissue-specific marker of Ecdysozoa.

Over the past few years, molecular studies of phylogeny have challenged the traditional view of evolutionary relationships among protostomian animal phyla. Based on analysis of 18S ribosomal RNA gene sequences, it has been suggested that some traditional groups, like the articulata and the pseudocoelomata, should be completely abandoned and that instead the protostomians should be split into two major clades: the Ecdysozoa and the Lophotrochozoa. However, this new molecular phylogeny still awaits confirmation by independent methods.

Optical spectroscopy of lanthanide ions in ZnO-TeO2 glasses.

Zinc tellurite glasses of compositions 19ZnO-80TeO2-1Ln2O3 with Ln = Eu, Er, Nd and Tm were prepared by melt quenching. The absorption spectra were measured and from the experimental oscillator strengths of the f-->f transitions the Judd-Ofelt parameters ohm(lambda) were obtained. The values of the ohm(lambda) parameters are in the range usually observed for oxide glasses.

The pattern of muscarinic acetylcholine receptor binding in the avian forebrain.

In autoradiographs of cryostat sections through the forebrains of domestic geese (Anser anser f. dom.) the distribution of muscarinic ACh-receptors was studied.

Regional distribution of muscarinic acetylcholine receptors in the telencephalon of the pigeon (Columbia livia f. domestica).

The distribution of muscarinic ACh receptors was studied autoradiographically in cryostat sections of the pigeon telencephalon using 3H-Quinuclidinylbenzylate (QNB) as a ligand. Highest receptor density was observed in the hyperstriatum ventrale, palaeostriatum augmentatum, septum, and parts of the archistriatum In sites of known sensory input of neostriatum (field L) and ectostriatum low receptor binding was observed. Acetylcholinesterase distribution is in good agreement with the receptor picture only in the basal telencephalon.

Neuroanatomical evidence for electroreception in lampreys.

The patterns of the anterior lateral-line afferents of Lampetra fluviatilis as revealed by transganglionic transport of horseradish peroxidase are described. The afferents form two roots in entering the rhombencephalon. Fibers of the dorsalmost root can be traced to a short dorsal fascicle which runs along the dorsal nucleus.