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 20 of 91 for “"bacterial isolates"”.
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Siderophore production by heterotrophic bacterial isolates from the Costa Rica Upwelling Dome
An increased understanding of heterotrophic bacterial strategies for acquiring nutrients and trace elements is critical for elucidating their impact on biogeochemical cycling in the ocean. It is estimated that iron is a limiting nutrient for phytoplankton growth in over 30% of the open ocean, but …
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Siderophore production by heterotrophic bacterial isolates from the Costa Rica upwelling dome
… An increased understanding of heterotrophic bacterial strategies for acquiring nutrients and trace elements is critical for elucidating their impact on biogeochemical cycling in the ocean. It is estimated that iron is a limiting nutrient for phytoplankton growth in over 30% of the open ocean, …
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Antimicrobial resistance patterns of foodborne bacterial isolates from HIV/AIDS patients in Lusaka, Zambia.
… drug resistance profile of foodborne bacterial isolates among HIV/AIDS patients. The study was a cross sectional study which was conducted from July to September, 2024 at a microbiology laboratory in the University teaching hospital (UTH). Stool samples were taken from respondents …
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Antimicrobial resistance patterns of foodborne bacterial isolates from HIV/AIDS patients in Lusaka, Zambia.
… drug resistance profile of foodborne bacterial isolates among HIV/AIDS patients. The study was a cross sectional study which was conducted from July to September, 2024 at a microbiology laboratory in the University teaching hospital (UTH). Stool samples were taken from respondents …
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Production and characterisation of bioflocculant produced by bacterial isolates from Richards Bay harbour, Kwazulu Natal
… sequencing method. Among the identified isolates, one with flocculating activity above 70% was used for bioflocculant production. Bacillus atrophaeus culture conditions were optimised for improved flocculating activity as well as the production yield. To obtain an optimum culture medium …
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Evidence for functional drift of bacterial isolates in response to cyanobacterial microcystin-lr and multiple peptide degradation in paucibacter toxinivorans.
Bacterial bioremediation has been proposed as an efficient, low cost and ecologically safe method to clean vital water reservoirs from cyanobacterial peptide toxins microcystins (MCs). In previous work carried out in 2008 several bacteria were isolated from Scottish freshwaters that effectively …
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Characterisation of bacteria by surface enhanced Raman spectroscopy (SERS)
Bacterial infections are common and usually require antimicrobial therapy; however, as antibiotic resistance is increasing, mortality and morbidity rates are also increasing, placing significant economic burden on healthcare systems worldwide. Therefore, rapid detection of bacterial species causing …
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Comparative genomics of bacteria from amphibian skin associated with inhibition of an amphibian fungal pathogen Batrachochytrium dendrobatidis
… (Bd). We analyzed whole genome sequences of 40 bacterial isolates that had been previously cultured from the skin of four amphibian species from Virginia, USA, and tested for their ability to inhibit Bd growth via an in vitro challenge assay. These 40 isolates spanned 11 families and 13 genera. …
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Phylogenetic Relationships of Thermophilic Bacteria
… The phylogenetic relationships of several new isolates of extremely thermophilic bacteria have been determined and used to gain a deeper understanding of the role of thermophilic bacteria in early evolution. The 16S and 23S ribosomal RNA genes from the new bacterial isolates were cloned and …
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Physiological adaptations of microorganisms to high oxygen in two oligotrophic lakes
… was <0.5 Hm in Lake Hoare. Five microbial isolates were selected from Lake Hoare by growth under very high oxygen (=VHO, 4.6x in situ HDO, 55 lb in⁻² of added oxygen). One isolate was selected under ADO from shallow benthic mat underlying HDO waters. Isolates were examined for physiological …
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Screening and evaluation of bacteria for the biological control of Botrytis cinerea on Vitis vinifera
… can control B. cinerea. This study aimed to test bacterial isolates for antifungal activity against B. cinerea and investigate their modes of action, which can aid in preventing grey mould in grapes. The dual-culture assay was used as a preliminary screening method to test antifungal activity …
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The exploration of potato-associated bacteria in the Central Andean Highlands and their application in integrated crop management systems
… in the isolation and in vitro screening of 600 bacterial isolates. The best performing isolates, under in vitro conditions, were field trialled in their home countries. Six of the isolates, Pseudomonas sp. R41805 (Bolivia), Pseudomonas palleroniana R43631 (Peru), Bacillus sp. R47065, R47131, …
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Isolation, identification, and characterization of antibiotic-producing microorganisms from soil
… using agar well diffusion, revealing that the bacterial isolates exhibited significant antimicrobial activity against the four pathogenic bacterial strains tested (Chapter 3). Furthermore, the use of 16S rRNA sequencing aided the identification of the active bacterial isolates at the molecular …
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Mechanisms and ecological implications of resistance to predation by heterotrophic ciliates expressed by marine bacteria
… performance when compared to seawater-derived bacterial isolates. However, seawater-derived bacterial isolates demonstrated higher resistance to grazing than surface-attached bacteria. A variety of protozoan grazing resistance mechanisms were detected, including toxicity, biofilm formation and …
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Bacteria Big and Small: Exploring the Gut Microbiota of Marine Herbivorous Fish and Student Learning About Cell Size
… and genome content. The gene content of 106 bacterial isolates differs significantly by isolation source supported by non-metric multidimensional scaling (NMDS) analyses. In addition to environmental conditions, bacterial metabolic processes may be impacted by cell size. Because bacteria are …
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Characterisation and plastic-degrading potential of plastisphere-associated microorganisms
… and (i) compared the degradation potential of bacterial isolates, the (ii) influence plastic leachates have on microbial communities, and the (iii) functional potential of the plastisphere, including its potential for plastic degradation, via shotgun metagenomic sequencing. We were unable to …
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Allelopathy of marine macroalgae against microbial epibiosis
… on tissue extracts of entire algae against few bacterial isolates, thereby not only neglecting ecologically relevant bacteria but also natural delivery mechanisms of algal antimicrobial agents. In my study, I investigated antimicrobial effects of waterborne algal metabolites utilizing …
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Sediment-associated cues for larval settlement of Polydora cornuta and Streblospio benedicti (Polychaeta, Spionidae)
… of larvae guided by sediment associated bacterial cues. This hypothesis was tested in still water laboratory settlement assays with and without choice option for larvae of two spionid polychaetes with indirect development: Polydora cornuta and Streblospio benedicti. Larvae were able to …
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Bacteria isolated from coriander and other umbelliferous herbs
Thirteen bacterial isolates associated with leaf spotting symptoms of coriander (Coriandrum sativum Linn.), anise (Pimpinella anisum) and caraway (Carum carvi), were tested for pathogenicity to coriander. Inoculation of young plants showed that 10 isolates caused dark, water soaked lesions on the …
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