A5101841956- Microbial Community Ecology and Physiology
- Indoor Air Quality and Microbial Exposure
- Polar Research and Ecology
- Genomics and Phylogenetic Studies
- Photonic and Optical Devices
- Biocrusts and Microbial Ecology
- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Protist diversity and phylogeny
- Gut microbiota and health
- Photonic Crystals and Applications
- Planetary Science and Exploration
- Semiconductor Lasers and Optical Devices
- Synthesis and Biological Evaluation
- Lichen and fungal ecology
- Phosphorus compounds and reactions
- Aquaculture disease management and microbiota
- Marine and coastal plant biology
- Aquatic Invertebrate Ecology and Behavior
- Marine Bivalve and Aquaculture Studies
- Advanced Fiber Optic Sensors
- Silicon Nanostructures and Photoluminescence
- Marine Biology and Ecology Research
- Species Distribution and Climate Change
- Fungal Plant Pathogen Control
St. John's University
2025
Auckland University of Technology
2016-2024
Flinders University
2024
University of Nevada, Las Vegas
2023
Johns Hopkins Medicine
2023
Johns Hopkins University
2023
University of Tampa
2018
University of Waikato
2010-2016
GNS Science
2010-2016
University of Toyama
2016
High-quality Ge epilayers on Si with low threading-dislocation densities were achieved by a two-step ultrahigh vacuum/chemical-vapor-deposition process followed cyclic thermal annealing. On large wafers, density of 2.3×107 cm−2 was obtained. Combining selective area growth annealing produced an average 2.3×106 cm−2.We also demonstrated small mesas no threading dislocations. The described in this letter for making high-quality is uncomplicated and can be easily integrated standard processes.
We demonstrate 0.8-dB/cm transmission loss for a single-mode, strip Si/SiO(2) waveguide with submicrometer cross-sectional dimensions. compare the conventional waveguide-fabrication method two smoothing technologies that we have developed, oxidation and anisotropic etching. observe significant reduction of sidewall roughness our technologies, which directly results in reduced scattering losses. The rapid increase losses as dimension is miniaturized, seen conventionally fabricated waveguides,...
In this letter, we experimentally evaluate the effect of miniaturization and surface roughness on transmission losses within a Si/SiO2 waveguide system, explain results using theoretical model. Micrometer/nanometer-sized waveguides are imperative for its potential use in dense integrated optics optical interconnection silicon circuits. A model was employed to predict relationship between dielectric width. This accurately predicts that loss increases as width decreases. Furthermore, show...
Abstract Aeolian dust is emerging as a significant vehicle for long‐range transport of microorganisms. Nonetheless, many factors relating to this highly influential dispersal mechanisms remain unresolved, including the variation in bacterial communities during stochastic desert events, and effect aeolian transit over continental oceanic surfaces these communities. Here we report temporal study that encompassed multiple events elucidate 16S rRNA gene‐defined changes airborne at...
Exposure to airborne particulates is estimated as the largest cause of premature human mortality worldwide and particular concern in sub-Saharan Africa where emissions are high data lacking. Particulate matter (PM) contains several toxic organic species including polycyclic aromatic hydrocarbons (PAHs) nitrated PAHs (NPAHs). This study provides first characterization source identification for PM10- PM2.5-bound NPAHs during a three-month period that spanned dry wet seasons at three locations...
Many marine herbivorous fishes harbour diverse microbial communities in the hindgut that can play important roles host health and nutrition. Kyphosus sydneyanus is a temperate fish feeds predominantly on brown seaweeds. We employed 16S rRNA gene amplicon sequencing gas chromatography to characterize their metabolites different regions of six K. sydneyanus. Measurements were confined three distal sections intestine, labelled III, IV V from anterior posterior. A total 625 operational taxonomic...
Kuwaiti hypersaline soil samples were contaminated with 5 % (w/w) weathered light crude oil and bioaugmented autochthonous halophilic hydrocarbonoclastic archaeal bacterial strains, two each, individually as consortia. Residual contents determined, microbial communities analyzed by culture-dependent culture-independent approaches initially seasonally for one year. After year of the bioremediation process, mean degradation rate was similar across all treated soils including controlled...
The evolution of the insecticidal pyrazoline moiety that was originally discovered in 1972 has led to discovery a new crop insecticide, indoxacarb, which is first commercialized pyrazoline-type sodium-channel blocker. Both monocyclic and fused-tricyclic pyrazolines pyridazines, as well structurally related semicarbazones were examined prior analogous tricyclic oxadiazines had similarly high activity favorable environmental dissipation rates low toxicity non-target organisms. eventual leading...
Abstract. Aerosol particles, including airborne microorganisms, are transported through the free troposphere from Asian continental area to downwind in East Asia and can influence climate changes, ecosystem dynamics, human health. However, variations present bacterial communities over areas poorly understood, there few studies that provide an in-depth examination of effects long-range transport aerosols (natural anthropogenic particles) on variations. In this study, vertical distributions at...
Global patterns in diversity were estimated for cyanobacteria-dominated hypolithic communities that colonize ventral surfaces of quartz stones and are common desert environments. A total 64 recovered from deserts on every continent plus a tropical moisture sufficient location. Community was using combined t-RFLP fingerprinting high throughput sequencing approach. The analysis revealed different the single non-desert striking pattern also emerged where Antarctic clearly distinct all other...
Sediments in the hyper-arid core of Atacama Desert are a terrestrial analog to Mars regolith. Understanding distribution and drivers microbial life sediment may give critical clues on how search for biosignatures Mars. Here, we identify spatial highly specialized bacterial communities previously unexplored depth horizons subsurface sediments 800 mm. We deployed an autonomous rover mission-relevant Martian drilling scenario with manual sample validation. Subsurface were delineated by related...
An aerobic, saccharolytic, obligately thermophilic, motile, non-spore-forming bacterium, strain T49(T), was isolated from geothermally heated soil at Hell's Gate, Tikitere, New Zealand. On the basis of 16S rRNA gene sequence similarity, T49(T) is first representative a new class in newly described phylum Armatimonadetes, formerly known as candidate division OP10. Cells stained Gram-negative and were catalase-positive oxidase-negative. possessed highly corrugated outer membrane. The major...
Asian dust events transport the airborne bacteria in Chinese desert regions as well mineral particles and influence downwind area varying biological ecosystems climate changes. However, bacterial dynamics were rarely investigated Gobi area, where are highly frequent. In this study, air samplings sequentially performed at a 2-m high above ground sampling site located (Tsogt-Ovoo of desert; Mongolia 44.2304°N, 105.1700°E). During event days, cells increased to more than tenfold concentrations....
Antarctic soil supports surface microbial communities that are dependent on ephemeral moisture. Understanding the response to availability of this resource is essential predicting how system will respond climate change. The McMurdo Dry Valleys largest ice-free region in Antarctica. They a hyper-arid polar desert with extremely limited moisture availability. Microbial colonization dominates ecosystem but surprisingly little known about changing regimes. We utilized natural model provided by...
Abstract The atmosphere is the least understood biome on Earth despite its critical role as a microbial transport medium. influence of surface cover composition airborne communities above marine systems unclear. Here we report evidence for dynamic presence at ocean–atmosphere interface major ecosystem, Great Barrier Reef, and identify that recent air mass trajectory over an oceanic or continental associated with observed shifts in bacterial fungal diversity. Relative abundance shared taxa...
The dispersion of microorganisms through the atmosphere is a continual and essential process that underpins biogeography ecosystem development function. Despite ubiquity atmospheric globally, specific knowledge determinants microbial diversity at any given location remains unresolved. Here we describe bacterial in boundary layer underlying soil twelve globally distributed locations encompassing all major biomes, characterise contribution local distant soils to observed community. Across...
Airborne microorganisms transported from forested areas can influence cloud formation by forming ice nuclei. However, the vertical transportation of airborne over is not well understood. We collected aerosols at three heights, [ground (2 m), canopy top (20 and above (500 m)] during summer, fall winter, to analyze microbial communities that were distributed vertically forest. During summer fall, particles maintained similar concentrations in forest zone (canopy ground) decreased 1/10th...
Abstract Allopatric speciation has been difficult to examine among microorganisms, with prior reports of endemism restricted sub-genus level taxa. Previous microbial community analysis via 16S rRNA gene sequencing 925 geothermal springs from the Taupō Volcanic Zone (TVZ), Aotearoa-New Zealand, revealed widespread distribution and abundance a single bacterial genus across 686 these ecosystems (pH 1.2-9.6 17.4-99.8 °C). Here, we present evidence suggest that this genus, Venenivibrio (phylum...