Several species of Neotropical Microdontinae (Diptera: Syrphidae) are mimics of stingless bees. Most of these species have previously been grouped in Ubristes Walker, 1852, with Carreramyia Doesburg, 1966, Hypselosyrphus Hull, 1937 and Stipomorpha Hull, 1945 treated as synonyms in recent literature. The species of the recently described genus Mermerizon Reemer, 2013 are also treated in the pres...

In this chapter we review the development of astronomy between two specific dates, roughly from 1300 BC to AD 500. Although this development is best understood by an examination of the Vedic and post-Vedic texts 1 , note that not all scientific knowledge of those early times can be assumed to have been committed to writing or, if written down, has survived. There are gaps in the sequence of ide...

Context. Globular clusters are representative of the oldest stellar populations. It is thus essential to have a complete census of these systems in dwarf galaxies, from which more massive galaxies are progressively formed in the hierarchical scenario. Aims. We present the results of spectroscopic observations of eight globular cluster candidates in NGC 147, a satellite dwarf elliptical galaxy o...

Traditional Chinese Medicine (TCM) is popular around the world and encompasses many different practices with particular emphasis on herbal TCM. Using the PubMed database, a literature search was undertaken to assess the extent herbal TCM products exert rare hepatotoxicity. Analysis of reported cases revealed numerous specified herbal TCM products with potential hepatotoxicity. Among these were ...

This paper presents the detailed results obtained in the search of density-velocity inhomogeneities in a volume limited and absolute magnitude limited sample of A-F type dwarfs within 125 parsecs of the Sun. A 3-D wavelet analysis is used to extract inhomogeneities, both in the density and velocity distributions. Thus, a real picture of the phase space is produced. Not only are some clusters an...

All software systems can contain faults. In critical systems, this problem is alleviated by controlling the possible effects of a fault being executed, typically through techniques for achieving fault tolerance. Ensuring that failures are properly isolated, and not allowed to propagate, is essential when developing critical systems. In much of the research on error propagation analysis the focu...