A5034107787- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Ga2O3 and related materials
- Semiconductor materials and devices
- Copper-based nanomaterials and applications
- Nanowire Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and interfaces
- Entomopathogenic Microorganisms in Pest Control
- Force Microscopy Techniques and Applications
- GaN-based semiconductor devices and materials
- Electronic and Structural Properties of Oxides
- Surface and Thin Film Phenomena
- Insect Resistance and Genetics
- Silicon Carbide Semiconductor Technologies
- Analytical Chemistry and Sensors
- Nanoparticles: synthesis and applications
- Advanced Sensor and Energy Harvesting Materials
- Thin-Film Transistor Technologies
- Advanced Chemical Sensor Technologies
- Insect symbiosis and bacterial influences
- Bone Tissue Engineering Materials
- Nanomaterials and Printing Technologies
- Crustacean biology and ecology
- Metal and Thin Film Mechanics
Swansea University
2014-2023
Centre College
2015
University of Wales
2002-2009
University of Brescia
2004
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2004
Sheffield Hallam University
2000-2002
Metarhizium anisopliae, a fungal pathogen of terrestrial arthropods, kills the aquatic larvae Aedes aegypti, vector dengue and yellow fever. The fungus without adhering to host cuticle. Ingested conidia also fail germinate are expelled in fecal pellets. This study investigates mechanism by which this adapted hosts mosquito larvae. Genes associated with M. anisopliae early pathogenic response (proteinases Pr1 Pr2, adhesins, Mad1 Mad2) upregulated presence larvae, but established infection...
Aedes aegypti is the vector of a wide range diseases (e.g. yellow fever, dengue, Chikungunya and Zika) which impact on over half world's population. Entomopathogenic fungi such as Metarhizium anisopliae Beauveria bassiana have been found to be highly efficacious in killing mosquito larvae but only now are underlying mechanisms for pathogenesis being elucidated. Recently it was shown that conidia M. caused stress induced mortality Ae. larvae, different mode pathogenicity normally seen...
Zinc oxide nano-wires (ZnO NWs) are synthesized reproducibly with high yield via a low temperature hydrothermal technique. The influence of the growth duration time, temperature, zinc precursor and base concentration Na2CO3 on morphology NWs is investigated. products characterised using scanning electron microscopy (SEM), Transmission (TEM), X-ray diffraction (XRD), photoelectron spectroscopy (XPS) photoluminescence (PL). SEM analysis shows that optimum 140 °C finds length diameter ZnO have...
The rapid production and incorporation of engineered nanomaterials into consumer products alongside research suggesting can cause cell death DNA damage (genotoxicity) makes in vitro assays desirable for nanosafety screening. However, conflicting outcomes are often observed when vivo study results compared, more physiologically representative models required to minimise reliance on animal testing. BASF Levasil® silica nanoparticles (16 85 nm) were used adapt the 3D reconstructed skin...
Fungal volatile organic compounds (VOCs) represent promising candidates for biopesticide fumigants to control crop pests and pathogens. Herein, VOCs produced using three strains of the entomopathogenic fungus Metarhizium brunneum were identified via GC-MS screened antimicrobial activity. The VOC profiles varied with fungal strain, development state (mycelium, spores) culture conditions. Selected against a range rhizosphere non-rhizosphere microbes, including Gram-negative bacteria...
Knowing and controlling the resistivity of an individual nanowire (NW) is crucial for production new sensors devices. For ZnO NWs this poorly understood; a 108 variation in has previously been reported, making reproducible devices almost impossible. Here, we provide accurate measurements NWs, using four-probe scanning tunnelling microscope (STM), revealing dependence on NW dimensions. To correctly interpret behaviour, atomic level transmission electron microscopy technique was employed to...
The ability to control the properties of electrical contacts nanostructures is essential realize operational nanodevices. Here, we show that behavior nanocontacts between free-standing ZnO nanowires and catalytic Au particle used for their growth can switch from Schottky Ohmic depending on size particles in relation cross-sectional width nanowires. We observe a distinct transition transport at an nanowire diameter ratio 0.6. current-voltage measurements performed with multiprobe instrument...
Mosquitoes transmit several diseases, which are of global significance (malaria, dengue, yellow fever, Zika). The geographic range mosquitoes is increasing due to climate change, tourism and trade. Both conidial blastospore formulations the entomopathogenic fungus, Metarhizium brunneum ARSEF 4556, being investigated as mosquito larvicides. However, concerns have been raised over possible non-target impacts arthropod predators such larvae Toxorhynchites brevipalpis feed on vector species....
Pyrite plays a significant role in governing the mobility of toxic uranium an anaerobic environment via oxidation–reduction process occurring at mineral–water interface, but factors influencing reaction kinetics remain poorly understood. In this study, natural pyrites with different impurities (Pb, As, and Si) surface pretreatments were used to react aqueous U(VI) from pH ∼3.0 ∼9.5. Both solid results indicated that freshly crushed pyrites, which do have more Fe2+/Fe3+ S2– sites generated...
In this study, the use of flexographic printing was investigated for low cost, high volume production devices incorporating nanowires through zinc acetate precursors on a substrate used to form oxide (ZnO) seeds growth using hydrothermal technique. The allows selective area ZnO nanowires, which has implications in high-yield nanowires. work presented here achieved printed line widths <60 μm with edge distortion (<3 μm) plate width 50 μm. hydrothermally grown show uniform density over...
Endometrial stromal and epithelial cell function is typically studied in vitro using standard two-dimensional monocultures, but these cultures fail to reflect the complex three-dimensional (3D) architecture of tissue. A 3D model bovine endometrium that reflects architectural arrangement vivo tissue would beneficially assist study function. An electrospun polyglycolide (PGA) scaffold was selected grow a primary endometrial cells, for pathophysiology. Electrospun scaffolds were seeded with...
We have developed a low-cost technique using conventional microwave oven to grow layered basic zinc acetate (LBZA) nanosheets (NSs) from acetate, nitrate and HMTA solution in only 2 min. The as-grown crystals their pyrolytic decomposition into ZnO nanocrystalline NSs are characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), atomic force (AFM), diffraction (XRD) photoluminescence (PL). SEM AFM measurements show that the LBZA typical lateral...
A quantitative method to measure the reduction in oxide species on surface of electrochemically etched tungsten tips during direct current annealing is developed using energy dispersive x-ray spectroscopy. Oxide are found decrease with current, trend repeatable over many and along length tip apex. linear resistivity approximation finds significant sublimation occurs at 1714 K, but melting broadening 2215 K. This can be applied calibrate any similar stage, identify tradeoff regime between...