A new high altitude montane species of Trichostetha Burmeister, 1842 is described from the Elandsberg range of the Western Cape interior. This represents the 14(th) species of the genus and the first to be reported with a description of its larva. It is a significant addition to the growing number of species that exhibit no adult feeding behaviour and a short period of activity restricted to th...

We have obtained infrared (1—2.5µm) spectroscopy for 42 halo and disk dwarfs with spectral type M1 to M6.5. These data are compared to synthetic spectra generated by the latest model atmospheres of Allard & Hauschildt. Photospheric parameters metallicity, effective temperature and radius are determined for the sample. We find good agreement between observation and theory except for known proble...

Sirovena Bouček (Chalcidoidea: Pteromalidae, Pireninae) was known only from females of its type species, S. stigma Bouček, 1988. Males and host associations were both unknown. Both sexes of a second species of Sirovena, S. costallifera sp. nov., reared from Ficus microcarpa L. (Moraceae) in Yunnan, China, are described based on morphological characters and mitochondrial COI sequences. The males...

The African dwarf crocodile, Osteolaemus tetraspis (Crocodilidae, Reptilia), possesses a pair of skin glands, the paracloacal glands, the secretion of which is thought to be used to mark nest sites or attract mates. Ten aromatic steroidal esters were isolated from this secretion and characterized on the basis of NMR spectroscopic investigations, electrospray ionization-MS analyses, and chemical...

Twenty-four new species of the caddisfly genus Polycentropus (Insecta: Trichoptera: Polycentropodidae) occurring in Brazil are diagnosed, described, and the male genitalia of each are illustrated. Eighteen of the new species are placed in the Polycentropus jorgenseni species complex of the Polycentropus gertschi group of New World Polycentropussensu lato. Furthermore, 6 new species within the P...

We present two results characterizing minimizers of the LTV functional F (u) ≡ ∫ |∇u|dx+λ ∫ |u−f |dx; u, f : R → R. If we restrict to u = χΣ and f = χΩ, Σ,Ω ∈ R, the LTV functional reduces to E(Σ) = Per(Σ) + λ|Σ M Ω|. We show that there is a minimizer Σ such that its boundary ∂Σ lies between the union of all balls of radius nλ contained in Ω and the corresponding union of nλ -balls in Ω . We al...

With changes in hormonal status, certain changes occur in the amount or distribution of adenosine triphosphatase, glucose 6-phosphatase and xanthine oxidase activities in rat-liver cytoplasm (Reid, O'Neal & Lewin, 1956). These studies have now been extended to include succinic dehydrogenase, deoxyribonuclease, and the two ribonucleases which appear to be present in liver-mitochondrial fractions...

STUDIES of single-locus polymorphisms in predominantly self-pollinating species of plants have yielded a considerable body of evidence that heterozygotes frequently have higher selective values than corresponding homozygotes (review in ALLARD, JAIN and WORKMAN 1966). Although this advantage of heterozygotes appears to be an important factor in maintaining the considerable heterozygosity observe...

A learning-cycle approach to science instruction is not new to science educators (Karplus, 1977; Kolb, 1984; Bergquist, 1991; Zollman, 1990; Allard and Barman, 1994). Somewhat less known, however, is the usefulness of this approach for creating lab activities for a broad audience of undergraduates. The following paper presents a brief overview of a laboratory activity that can be adapted for us...

Museums often lack the possibility to present archaeological or cultural heritage sites in a realistic and interesting way. Thus are proposing a new way to show augmented reality applications of cultural heritage sites at remote places like museums. In the exhibition space large wall-filling photographs of the real site are superimposed with interactive contextual annotations like 3D reconstruc...