FIRST RECORD OF BATHYTHRIX FORMOSA (DESVIGNES) (ICHNEUMONIDAE: CRYPTINAE) IN SERBIA

Bathythrix formosa (Desvignes, 1860) is a new finding of the ichneumonid wasp for the Serbian fauna. It was recorded on the locality Bojanine vode, Suva mt. Serbia from the host species Agroeca sp (Aranea: Liocranidae)

Identification and molecular characterization of Chryseobacterium vrystaatense ST1 isolated from oligomineral water of southeast Serbia

The isolation and molecular characterization of bacterial strains isolated from water sources in the Vlasina Mountain in southeast Serbia, confirmed the presence of a new species Chryseobacterium vrystaatense ST1. This Gram- negative species showed an extremely low level of biochemical reactivity in biochemical tests. The gene for 16S rRNA was amplified by PCR using universal primers and sequenced. Comparison of 16S rRNA gene sequence and phenotypic features indicated that the isolate ST belonged to Chryseobacterium vrystaatense. A BLAST search of sequenced 1088 nucleotides of the 16S rRNA gene with all sequences deposited in the NCBI collection showed the highest similarity (98%) with the strain Chryseobacterium vrystaatense sp. nov., designated as strain R-23533. The very high homology of these two strains allowed classification of our strain at the species level, but some differences indicate, and indirectly confirm, that the isolate ST is an authentic representative. On the basis of these results, we could conclude that Chryseobacterium vrystaatense ST was for first time isolated in Serbia, which is particularly important when one bears in mind that there are only three sequences of this species deposited in the NCBI collection

The effects of thermistor linearization techniques on the T-history characterization of phase change materials

Phase Change Materials (PCMs) are increasingly being used in the area of energy sustainability. Thermal characterization is a prerequisite for any reliable utilization of these materials. Current characterization methods including the well-known T-history method depend on accurate temperature measurements. This paper investigates the impact of different thermistor linearization techniques on the temperature uncertainty in the T-history characterization of PCMs. Thermistor sensors and two linearization techniques were evaluated in terms of achievable temperature accuracy through consideration of both, non-linearity and self-heating errors. T-history measurements of RT21 (RUBITHERM ® GmbH) PCM were performed. Temperature measurement results on the RT21 sample suggest that the Serial-Parallel Resistor (SPR) 1 linearization technique gives better uncertainty (less than ±0.1°C) in comparison with the Wheatstone Bridge (WB) 1 technique (up to ±1.5°C). These results may considerably influence the usability of latent heat storage density of PCMs in the certain temperature range. They could also provide a solid base for the development of a T-history measuring device. © 2012 Elsevier Ltd. All rights reserved

The Concept of Time in Don DeLillo’s Point Omega

Temporality is one of the key aspects that contribute to the reshaping of the narrative tendencies of literary modernism, thus leading to the emergence of new narrative strategies associated with postmodern literature. The aim of this paper is to scrutinize its representation in postmodern literature and theory, focusing on one of the notable works that illustrate this phenomenon. Influenced by Pierre Teilhard de Chardin’s theory of the final aim of evolution, defined as the omega point, Don DeLillo’s novel of the same name explores, in Peter Boxall’s words, the formal balance between cinematic time, urban time, and desert time. In that sense, the paper is particularly concerned with the plurality of time, prevalent in literary postmodernism. In order to provide insight into this matter, it is also essential to shed light on how it is represented in the works of Jorge Luis Borges, who exerted significant influence on DeLillo’s depiction of the concept of time in the contemporary world

SOME NEW IDENTITIES FOR THE SECOND COVARIANT DERIVATIVE OF THE CURVATURE TENSOR

In this paper we study the second covariant derivative of Riemannian curvature tensor. Some new identities for the second covariant derivative are given. Namely, identities obtained by cyclic sum with respect to three indices are given. In the first case, two curvature tensor indices and one covariant derivative index participate in the cyclic sum, while in the second case one curvature tensor index and two covariant derivative indices participate in the cyclic sum