Search Results (2)

This article presents the iProbe concept developed by the Canadian photographer Rita Leistner. This analytical tool is one of the ways to present the image of modern warfare that emerges from messages in social media and photographs taken using smartphones. Utilized to understand the approach are photographs Leistner took at the American military base in Musa Qala (Helmand province, Afghanistan) during the implementation of the “Basetrack” media project in 2011. The theoretical basis for this study is Marshall McLuhan’s media theory, which was used by the photographer to interpret her works from Afghanistan. Leistner is the first to apply the various concepts shaped by McLuhan in the second half of 20th century, such as “probe”, “extension of man”, and the “figure/ground” dichotomy, to analyze war photography. Her blog and book entitled Looking for Marshall McLuhan in Afghanistan shows the potential of using McLuhan’s concepts to interpret the image of modern warfare presented in the contemporary media. The application of McLuhan’s theory to this type of photographic analysis provides the opportunity to focus on the technological dimension of modern war and to look at warfare from a technical perspective such as what devices and communication solutions are used to solve armed conflicts as efficiently and bloodlessly as possible. Therefore, this article briefly presents twelve iProbes that Leistner created based on her experiences from working in Afghanistan concerning photography, military equipment, interpersonal relations, and various types of communication. Full article

Microspatial arrangements of sulfate-reducing microorganisms (SRM) in surface microbial mats (~1.5 mm) forming open marine stromatolites were investigated. Previous research revealed three different mat types associated with these stromatolites, each with a unique petrographic signature. Here we focused on comparing “non-lithifying” (Type-1) and “lithifying” (Type-2) mats. Our results revealed three major trends: (1) Molecular typing using the dsrA probe revealed a shift in the SRM community composition between Type-1 and Type-2 mats. Fluorescence in-situ hybridization (FISH) coupled to confocal scanning-laser microscopy (CSLM)-based image analyses, and ³⁵SO₄²⁻-silver foil patterns showed that SRM were present in surfaces of both mat types, but in significantly (p < 0.05) higher abundances in Type-2 mats. Over 85% of SRM cells in the top 0.5 mm of Type-2 mats were contained in a dense 130 µm thick horizontal layer comprised of clusters of varying sizes; (2) Microspatial mapping revealed that locations of SRM and CaCO₃ precipitation were significantly correlated (p < 0.05); (3) Extracts from Type-2 mats contained acylhomoserine-lactones (C4- ,C6- ,oxo-C6,C7- ,C8- ,C10- ,C12- , C14-AHLs) involved in cell-cell communication. Similar AHLs were produced by SRM mat-isolates. These trends suggest that development of a microspatially-organized SRM community is closely-associated with the hallmark transition of stromatolite surface mats from a non-lithifying to a lithifying state. Full article