OALib Journal期刊

ISSN: 2333-9721



匹配條件: “Kristine Bohmann” ,找到相關結果約400條。
Molossid bats in an African agro-ecosystem select sugarcane fields as foraging habitat
Christina Lehmkuhl Noer,Torben Dabelsteen,Kristine Bohmann,Ara Monadjem
African Zoology , 2012,
Abstract: Two coexisting species of African molossids the little free-tailed bat, Chaerephon pumila, and the Angolan free-tailed bat, Mops condylurus, were studied in the lowveld of Swaziland. Nine C. pumila and five M. condylurus, all non-lactating females, were radio-tracked in order to investigate their habitat utilisation. The results confirmed that both of these species selected to forage over sugarcane fields instead of over the other habitats available in the area: savanna, riparian forest and urban areas. Foraging ranges were relatively large with C. pumila travelling on average a maximum of 4.2 km from the roost and M. condylurus covering 4.8 km. The mean activity areas ranged from 976 ha (Minimum convex polygon) to 1319 ha (95% Kernel) for C. pumila and from 1190 ha (MCP) to 1437 ha (95% Kernel) for M. condylurus. Interspecific differences in the mean activity area or maximum distance travelled were not found. The results of this study suggest that these species have a potential role as pest controlling agents over sugarcane fields.
Molecular Diet Analysis of Two African Free-Tailed Bats (Molossidae) Using High Throughput Sequencing
Kristine Bohmann, Ara Monadjem, Christina Lehmkuhl Noer, Morten Rasmussen, Matt R. K. Zeale, Elizabeth Clare, Gareth Jones, Eske Willerslev, M. Thomas P. Gilbert
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0021441
Abstract: Given the diversity of prey consumed by insectivorous bats, it is difficult to discern the composition of their diet using morphological or conventional PCR-based analyses of their faeces. We demonstrate the use of a powerful alternate tool, the use of the Roche FLX sequencing platform to deep-sequence uniquely 5′ tagged insect-generic barcode cytochrome c oxidase I (COI) fragments, that were PCR amplified from faecal pellets of two free-tailed bat species Chaerephon pumilus and Mops condylurus (family: Molossidae). Although the analyses were challenged by the paucity of southern African insect COI sequences in the GenBank and BOLD databases, similarity to existing collections allowed the preliminary identification of 25 prey families from six orders of insects within the diet of C. pumilus, and 24 families from seven orders within the diet of M. condylurus. Insects identified to families within the orders Lepidoptera and Diptera were widely present among the faecal samples analysed. The two families that were observed most frequently were Noctuidae and Nymphalidae (Lepidoptera). Species-level analysis of the data was accomplished using novel bioinformatics techniques for the identification of molecular operational taxonomic units (MOTU). Based on these analyses, our data provide little evidence of resource partitioning between sympatric M. condylurus and C. pumilus in the Simunye region of Swaziland at the time of year when the samples were collected, although as more complete databases against which to compare the sequences are generated this may have to be re-evaluated.
A Versatile ΦC31 Based Reporter System for Measuring AP-1 and Nrf2 Signaling in Drosophila and in Tissue Culture
Nirmalya Chatterjee, Dirk Bohmann
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0034063
Abstract: This paper describes the construction and characterization of a system of transcriptional reporter genes for monitoring the activity of signaling pathways and gene regulation mechanisms in intact Drosophila, dissected tissues or cultured cells. Transgenic integration of the reporters into the Drosophila germline was performed in a site-directed manner, using ΦC31 integrase. This strategy avoids variable position effects and assures low base level activity and high signal responsiveness. Defined integration sites furthermore enable the experimenter to compare the activity of different reporters in one organism. The reporter constructs have a modular design to facilitate the combination of promoter elements (synthetic transcription factor binding sites or natural regulatory sequences), reporter genes (eGFP, or DsRed.T4), and genomic integration sites. The system was used to analyze and compare the activity and signal response profiles of two stress inducible transcription factors, AP-1 and Nrf2. To complement the transgenic reporter fly lines, tissue culture assays were developed in which the same synthetic ARE and TRE elements control the expression of firefly luciferase.
Artificial Neural Network for Displacement Vectors Determination
D. Levicky,P. Bohmann
Radioengineering , 1997,
Abstract: An artificial neural network (NN) for displacement vectors (DV) determination is presented in this paper. DV are computed in areas which are essential for image analysis and computer vision, in areas where are edges, lines, corners etc. These special features are found by edges operators with the following filtration. The filtration is performed by a threshold function. The next step is DV computation by 2D Hamming artificial neural network. A method of DV computation is based on the full search block matching algorithms. The pre-processing (edges finding) is the reason why the correlation function is very simple, the process of DV determination needs less computation and the structure of the NN is simpler.
The Equivariant Generating Hypothesis
Anna Marie Bohmann
Mathematics , 2009, DOI: 10.2140/agt.2010.10.1003
Abstract: We state the generating hypothesis in the homotopy category of G-spectra for a compact Lie group G, and prove that if G is finite, then the generating hypothesis implies the strong generating hypothesis, just as in the non-equivariant case. We also give an explicit counterexample to the generating hypothesis in the category of rational S^1-equivariant spectra.
Global orthogonal spectra
Anna Marie Bohmann
Mathematics , 2012,
Abstract: For any finite group G, there are several well-established definitions of a G-equivariant spectrum. In this paper, we develop the definition of a global orthogonal spectrum. Loosely speaking, this is a coherent choice of orthogonal G-spectrum for each finite group G. We use the framework of enriched indexed categories to make this precise. We also consider equivariant K-theory and Spin^c-cobordism from this perspective, and we show that the Atiyah--Bott--Shapiro orientation extends to the global context.
A comparison of norm maps
Anna Marie Bohmann
Mathematics , 2012,
Abstract: We present a spectrum-level version of the norm map in equivariant homotopy theory based on the algebraic construction in work of Greenleess-May. We show that this new norm map is same as the construction in work Hill-Hopkins-Ravenel on the Kervaire invariant problem. Our comparison of the two norm maps gives a conceptual understanding of the choices inherent in the definition of the multiplicative norm map.
Origins and the Reasons of Monetary Crises in Georgia (1995-2016)  [PDF]
David Aslanishvili, Kristine Omadze
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.711119
Abstract: The article “Monetary Crises in Georgia (Authors: Doctor of Economy, David Aslanishvili and Doctor of Business Administration, Kristine Omadze) is the first attempt to overview the three main monetary crises in Georgian history since its independence and to study origins of the crises and evolution. The purpose of this article is to study the three monetary crises in Georgia itself and the errors in the Monetary Policy provided by The National Bank of Georgia and Georgian Government. It is crucial for stable economic development to have corrected Monetary Policy and to avoid mistakes similar to the mentioned in this article. At the same time, the article pays attention to importance of coordination providing Monetary Policy between the National Bank of Georgia and the Ministry of Finance. In our opinion only such coordination is the best solution for crisis prevention. Our research aims to determine the relevance and regularity of Georgian Lari (GEL) exchange rate and monetary policies conducted by the National Bank of Georgia.
Graded Tambara Functors
Vigleik Angeltveit,Anna Marie Bohmann
Mathematics , 2015,
Abstract: We define the notion of an $\mathcal{RO}(G)$-graded Tambara functor and prove that any $G$-spectrum with norm multiplication gives rise to such an $\mathcal{RO}(G)$-graded Tambara functor.
Glomalin and Soil Aggregation under Six Management Systems in the Northern Great Plains, USA  [PDF]
Kristine A. Nichols, James Millar
Open Journal of Soil Science (OJSS) , 2013, DOI: 10.4236/ojss.2013.38043

The soil environment is linked to aboveground management including plant species composition, grazing intensity, levels of soil disturbance, residue management, and the length of time of a living plant is growing. Soil samples were collected under rangeland [native grass, rotational grazing (NGRG); tame grass, heavy grazing (TGRG); and tame grass, rotational grazing (TGHG)] and cropland [conventional till (CT); CT plus manure (CTM); and long term no till (NT)] systems. The rangeland systems were hypothesized to have higher glomalin content [measured as Bradford-reactive soil protein (BRSP)] and water stable aggregation (WSA) than the cropland systems. In addition, within both rangeland and cropland systems, BRSP and WSA were expected to decline with increased disturbance due to grazing or tillage and going from native to introduced plant species. Differences were detected for BRSP with NGRG and CTM having the highest values in range and cropland systems, respectively. However, the CTM system had higher BRSP values than one or both of the tame grass systems while the CT and NT systems had similar values. Correlation analysis showed strong relationships between all of the BRSP values and WSA.


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