Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"hyper-arid"”.
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Seasonal dynamics of edaphic bacterial communities in the hyper-arid Namib desert
The aim of this study is to investigate the edaphic bacterial community dynamics over short (57 days) and long-term (1 year) sampling intervals using an extensive sampling strategy in combination with community fingerprinting by T-RFLP analyses and micro environmental characterization. The …
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Seasonal dynamics of edaphic bacterial communities in the hyper-arid namib desert
The Namib Desert is a hyper-arid, coastal desert with limited bioavailable water and nutrients; characteristics which collectively impose constraints on edaphic microbial communities. Several studies in the Namib Desert have investigated changes in soil microbial communities across space. However, …
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Characterization of inducible antibiotic production by streptomycetes isolated from hyper-arid environments
… locations. Furthermore, phenotypic analysis and hyper-spectral imaging revealed hidden diversity of the isolates. Whole-genome analysis contradicted the phylogenetic relationship observed using 16S rRNA. Unique inter and intraspecific variations between isolates emerged with two distinct clades …
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The Mechanism and Timescales of Soil Formation in the Hyper-arid Atacama Desert, Chile
… Chile to understand the soil formation in hyper-arid environments, as an analog for planetary surfaces such as the Mars. In detail, the basic mechanism regarding the source material, timescale, paleo-climatic settings and the role of crypto-biotic crusts have been investigated to constrain …
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Climatic and Geomorphic Interactions on Alluvial Fans in the Atacama Desert, Chile
… that yield surface-forming flows in the hyper-arid region. The results of this study aid in understanding the evolution of various surfaces in the region. In particular, results provide a clear indication of the ability of a particular storm event --i.e., precipitation rate to activate a …
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Factors affecting VA-mycorrhizal community structure in the Namib Dune Field: and the population biology of an ectomycorrhizal Basidiomycete: Suillus granulatus
… was studied across a climatic gradient in the hyper-arid central Namib dune field. VAM fungal communities were primarily structured by substrate stability and moisture availability. Five VAM species were found throughout the study area and were not host specific. Percent mycorrhizal …
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The effect of environmental stress on antibiotic production by streptomyces
… in sparsely researched locations such as the hyper-arid Atacama Desert in Chile and compare them to more commonly researched North European soil samples which are naturally more hydrated. In this project we studied bacteria isolated from soil samples from Chiles Atacama Desert and the west of …
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Envisioning Water: Sustainability and Future-Making in Dubai and Los Angeles
… planned and prepared for in two dryland cities – hyper-arid Dubai and semi-arid Los Angeles – as the climate changes and as they face increasing pressures to become more ‘sustainable.’ Both Dubai and LA are cities that have long been deemed unsustainable, but are aiming to become sustainability …
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Investigating 1500 Years of Dietary Change in the Lower Ica Valley, Peru Using an Isotopic Approach
In the now hyper-arid desert of the south coast of Peru, the natural desiccation of human remains provides a rare and unique opportunity for detailed study into the dietary practices of the people that once lived there. My research investigates the changing subsistence strategies of four groups …
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Passive architecture tool for exploratory design : case of Qatar
… building techniques that evolved from the hyper-arid environment to ameliorate harsh thermal conditions. Faced with a growing energy crisis, design professionals in Qatar have the opportunity to reduce demand and to maximize the potential of building and site by incorporating low-energy …
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Seasonal Influences on the Carbon-Water Relations in Ponderosa Pine Forests in the Northern Boundary of the North American Monsoon System
Climate models have projected that arid and semiarid lands will experience warmer and drier conditions for the next 100 years. For the last twenty years, the Southwestern US has been experiencing one of the worst droughts over the last century, not only threatening ecological systems but also the …
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Ephemeral river systems at the Skeleton Coast, NW-Namibia - Sedimentological and geomorphological studies on the braided river dominated Koigab Fan, the Cenozoic succession in the Uniabmond area and comparative studies on fluvio-aeolian interaction between ephemeral rivers and the Skeleton Coast Erg
… towards the Atlantic Ocean. The area is hyper-arid with less than 50 mm average annual rainfall and a rainfall variability of 72%. Therefore, the major catchment areas of the rivers are about 100-200 km further inland in regions with relatively high annual rainfall of 300-600 mm. The …
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Reconstructing climate from the Dead Sea sediment record using high-resolution micro-facies analyses
… boundary between Mediterranean sub-humid to semi-arid and Saharo-Arabian hyper-arid climates, so that even small shifts in atmospheric circulation are sensitively recorded in the sediments. This DFG-funded doctoral project was carried out within the ICDP Dead Sea Deep Drilling Project (DSDDP) that …