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.
Results
Showing 1 to 20 of 40 for “"Amoebae"”.
-
Cooperation, conflict, and experimental evolution in social amoebae
Cooperation and cheater control have helped shape life as we know it, but there is still much to learn. A eukaryote microbial model organism, like Dictyostelium discoideum , is an excellent system for advancing our understanding. When faced with starvation, multiple genetically distinct clones of …
-
Monitoring Peatland Damage and Restoration Using Testate Amoebae as Indicator Organisms
This thesis has examined the response of testate amoebae communities to restoration at three peatland sites in the UK. It builds upon the use of testate amoebae analysis as a palaeoenvironmental tool by exploring the hypothesis that testate amoebae respond to hydrological conditions in restored …
-
Robustness and precision of Holocene palaeoclimatic records from peatlands using testate amoebae
… the first attempt to use quantitative testate amoebae (Protozoa: Rhizopoda) analysis to measure hydrological fluctuations in British peatbogs over the Holocene. Changes in the fossil species assemblage are used to reconstruct the mean annual water table records at different locations on mire …
-
Holocene palaeohydrology from testate amoebae analysis: developing a model for British peatlands
Testate amoebae (Protozoa: Rhizopoda) are particularly abundant in peatlands. Previous studies have used testate amoebae in palaeoenvironmental studies, but have used qualitative data only, so that results are expressed only in terms of 'wet', 'dry' or 'moist'. This study uses testate amoebae to …
-
Lacustrine Arcellinida (Testate Lobose Amoebae) as Bioindicators of Arsenic Contamination: A new tool for Environmental Risk Assessment
Gold mining in northern Canada, while profitable, has left a legacy of arsenic (As) contamination, especially in lakes. Arcellinida, lacustrine benthic protozoans, have great As-biomonitoring potential that has yet to be exploited by lake restoration initiatives. This research aims to further …
-
Microbiology and cell biology of the interaction between Listeria monocytogenes and Acanthamoeba spp.
… be contact with other microorganisms, including amoebae, which naturally feed on bacteria as a source of nutrients. In this context, research has shown that several intra-cellular pathogens are able to survive or replicate within free-living amoebae. In view of the potential for amoebae to act as …
-
A STUDY OF THE MICROORGANISMS INHABITING ROTATING BIOLOGICAL CONTACTOR BIOFILMS DURING VARIOUS OPERATING CONDITIONS
… and unicellular bacteria, zooflagellates, amoebae, ciliates, nematodes, and rotifers is complex and depends on the organic loading rate. Filaments found in initial biofilm studies were identical as Sphaerotilus in both morphological and ultrastructural characteristics. At high loading rates …
-
Holocene sea-level changes in the Falkland Islands: new insights into accelerated sea-level rise in the 20th Century
… This thesis also focused on developing testate amoebae as sea-level indicators. In the Falklands, testate amoebae transfer functions were able to reconstruct sea level with precision (±0.08 m) comparable to diatoms (±0.07 m). However, preservation issues were indicated in the fossil testate …
-
Whole Skin Locomotion Inspired by Amoeboid Motility Mechanisms: Mechanics of the Concentric Solid Tube Model
… of certain single celled organisms such as amoebae. Whole Skin Locomotion (WSL), as we call it, works by way of an elongated toroid which turns itself inside out in a single continuous motion, effectively generating the overall motion of the cytoplasmic streaming ectoplasmic tube in amoebae. …
-
A comparison of flow cytometry and conventional microbiology in the study of biofilms.
… to enumerate, sort and image the bacteria and amoebae in biofilms and water distribution systems as a rapid and sensitive semiautomated technique compared with conventional microbiology.It has been shown that the results of flow cytometric analysis of total Legionella pneumophila cells have a …
-
Microbial diversity of a nature reserve: eukaryotic microorganisms of Mere Sands Wood in N.W. England
… a new idea in nature conservation. Using Testate amoebae and Diatoms as model organisms, this study aimed at expanding the Wildlife Trust’s knowledge of biodiversity at its Mere Sands Wood Nature Reserve by describing and quantifying microbial diversity and distribution using traditional protist …
-
Molecular analysis of glycogen phosphorylase-1 gene expression during the development of dictyostelium discoideum
… from a λgtll expression library made from amoebae stage mRNA. The 5' upstream region of the gp-l gene was cloned by inverted polymerase chain reaction (IPCR) and partial genomic DNA library screening. The gp-l gene was found as one copy or low copy number gene in the …
-
DETECTION OF SECRETED PROTEASES AND A MEMBRANE PROTEASE IN PATHOGENIC ACANTHAMOEBA CULBERTSONI
… fluoride (PMSF) did not diminish the ability of amoebae to attach or invade. It was demonstrated that secretion of the observed proteases occurred in a constitutive rather than substrate-induced manner and that amoebae secrete these proteases under a number of different conditions. Additionally, …
-
HOLOCENE PALAEOCLIMATE RECONSTRUCTION FROM N EW ZEALAND PEATLANDS
… degrees of success, peat humification, testate amoebae, plant macrofossil and charcoal analyses contributed to determining the palaeomoisture records from three cores on each site. Climatic inferences have successfully been made for the Waikato region, mid North Island, over the period between …
-
Stormy records from peat bogs in south-west Sweden : implications for regional climatic variability and vegetation changes during the past 6500 years
… values from both study sites, whereas testate amoebae analysis was applied on cores from Undarsmosse bog only. Pollen analysis was carried out to reconstruct vegetation and land use changes. In addition the hypothetical regional scale vegetation composition around the Store Mosse bog was …
-
Methylobacterium spp.: Emerging Opportunistic Premise Plumbing Pathogens
… desiccation-resistant, growth in amoebae and growth in low oxygen conditions. Methylobacterium spp. have been recognized as an emerging OPPP, so the purpose of this study was to investigate these waterborne bacteria in more detail to determine whether they have all characteristics …
-
Subarctic ecosystem responses to climate, catchment and permafrost dynamics in the Holocene
… and carbonate content, mosses, diatoms, testate amoebae, pigments, carbon and nitrogen and their stable isotopes, near infrared spectroscopy and biogenic silica. Results revealed that the structural development of the mire occurred during the later part of the Holocene. Peat inception was dated …
-
Identifying a role for WASH in the endocytic pathway of Dictyostelium discoideum
… successfully disrupt WASH in the single celled amoebae \(Dictyostelium\) \(discoideum\) and discover a role for WASH in the endocytic pathway. WASH was shown to be essential for the trafficking of indigestible material through the endocytic pathway, with its disruption causing a complete bock in …
-
<i>Dictyostelium discoideum</i> Protein Kinase C-orthologue <i>pkcA</i> Regulates the Actin Cytoskeleton through Interaction with Phospholipase D and p21-activated Kinase
… cytoskeleton. When starved, these unicellular amoebae undergo a multicellular developmental process characterized by a tightly regulated sequence of signaling events. This results in chemotaxis and formation of a multicellular aggregate, and ultimately cell differentiation and the formation of …
Page 1 of 2