A5002516753- Quantum and electron transport phenomena
- Graphene research and applications
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Molecular Junctions and Nanostructures
- Isotope Analysis in Ecology
- Marine Bivalve and Aquaculture Studies
- Geology and Paleoclimatology Research
- Advancements in Battery Materials
- Quantum many-body systems
- Theoretical and Computational Physics
- Pleistocene-Era Hominins and Archaeology
- Topological Materials and Phenomena
- Immunotherapy and Immune Responses
- Archaeology and ancient environmental studies
- 2D Materials and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Iron and Steelmaking Processes
- Surface and Thin Film Phenomena
- Digital Imaging in Medicine
- Clay minerals and soil interactions
- Nanocluster Synthesis and Applications
- Bacteriophages and microbial interactions
- Surface Chemistry and Catalysis
- MXene and MAX Phase Materials
University of York
2013-2024
Aalto University
2010
Helsinki Institute of Physics
2008
Monash University
2002-2005
Ab initio methods are used to study the spin-resolved transport properties of graphene nanoribbons (GNRs) that have both chemical and structural edge disorder. Oxygen adsorbates on ideal protruded ribbons chosen as representative examples, with protrusions forming smallest possible disorder consistent geometry. The impact oxygen adsorbate dominates armchair nanoribbons. For zigzag nanoribbons, transmission markedly affected by protrusion alone, leading spin-polarized a smaller perturbation...
An extended tight-binding model that includes up to third-nearest-neighbor hopping and a Hubbard mean-field interaction term is tested against ab initio local spin-density approximation results of band structures for armchair- zigzag-edged graphene nanoribbons. A single parameter set found accurately reproduce the both armchair zigzag cases. Transport calculations based on faithfully transport nanoribbon-based systems.
Bone marrow stromal cells (BMSCs, also called bone-marrow-derived mesenchymal cells) provide hematopoietic support and immunoregulation contain a stem cell fraction capable of skeletogenic differentiation. We used immortalized human BMSC clonal lines for multi-level analysis functional markers subsets. All clones expressed typical cell-surface antigens; however, with trilineage differentiation capacity exhibited enhanced vascular interaction gene sets, whereas non-differentiating were...
Isotopic and molecular analysis on human, fauna pottery remains can provide valuable new insights into the diets subsistence practices of prehistoric populations. These are crucial to elucidate resilience social-ecological systems cultural environmental change. Bulk collagen carbon nitrogen isotopic 82 human individuals from mid late Holocene Brazilian archaeological sites (∼6,700 ∼1,000 cal BP) reveal an adequate protein incorporation and, coast, continuation in strategies based...
Hydrogen peroxide is a cosubstrate for the oxidative cleavage of saccharidic substrates by copper-containing lytic polysaccharide monooxygenases (LPMOs). The rate reaction LPMOs with hydrogen high, but it accompanied rapid inactivation enzymes, presumably through protein oxidation. Herein, we use UV–vis, CD, XAS, EPR, VT/VH-MCD, and resonance Raman spectroscopies, augmented mass spectrometry DFT calculations, to show that product an AA9 LPMO H2O2 at higher pHs singlet Cu(II)–tyrosyl radical...
The 2010 Nobel Prize in physics was awarded to Professors Andre Geim and Konstantin Novoselov for their ground-breaking experiments on graphene, a single atomic layer of carbon, more generally, pioneering work uncovering new class materials, namely two-dimensional crystals. This paper gives an accessible account review the story graphene; from its first description literature, realization confirmation remarkable properties, through impressive potential broad-reaching applications. graphene...
Shell beads appear to have been one of the earliest examples personal adornments. Marine shells identified far from shore evidence long-distance transport and imply networks exchange negotiation. However, worked lose taxonomic clues identification, this may be compounded by taphonomic alteration. Consequently, significance key early artefact underestimated. We report use bulk amino acid composition stable intra-crystalline proteins preserved in shell biominerals application pattern...
The magnetic and coherent transport properties of small-width zigzag graphene nanoribbons (ZGNRs) with monohydrogen edge passivation are investigated as a function random edge-vacancy disorder ribbon length. Results from noninteracting tight-binding models (i) nearest (ii) up to third neighbor hopping compared against those obtained an extended mean-field Hubbard model for edge-defected ZGNRs (length = 48.02 $\AA{}$ width 9.24 $\AA{}$). Through ensemble averaging, persistent magnetism...
Quantitative Raman spectroscopy provides information-rich imaging of complex tissues. To illustrate its ability to characterise early-stage disease, we compared live P4E6, a low-grade Gleason-3 prostate-cancer cell line, PNT2-C2, normal prostate cell-line equivalent, thereby elucidating key molecular and mechanistic differences. Spectral changes from statistically relevant population sampling show P4E6 is defined by reduced DNA/RNA signatures (primarily base-pair modifications), increased...
We have calculated the absorption characteristics of different hybrid systems consisting Ag, Ag2, or Ag3 atomic clusters and poly(methacrylic acid) using time-dependent density-functional theory. The polymer is found to an extensive structural-dependency on spectral patterns relative bare clusters. spectrum can be “tuned” visible range for with odd number electrons per silver cluster, whereas comprising even leading edge shifted up ∼4.5 eV. results give theoretical support experimental...
Polyprenol phosphate mannose (PPM) is a lipid-linked sugar donor used by extra-cytoplasmic glycosyl tranferases in bacteria. PPM synthesiszed polyprenol synthase, Ppm1, and most Actinobacteria as the for protein O-mannosyl transferase, Pmt, glycosylation. Ppm1 Pmt have homologues yeasts humans, where they are required O-mannosylation. also use lipoglycan biosynthesis. Here we show that ppm1 mutants of Streptomyces coelicolor increased susceptibility to number antibiotics target cell wall The...
Abstract Easy, quantitative measures of biomolecular heterogeneity and high-stratified phenotyping are needed to identify characterise complex disease processes at the single-cell level, as well predict cell fate. Here, we demonstrate how Raman spectroscopy can be used in difficult-to-assess case clonal, bone-derived mesenchymal stromal cells (MSCs) MSC lines group these according biological function (e.g., differentiation capacity). Biomolecular stratification is achieved using...
The role of uniaxial strain in armchair, T-graphene nanoribbons (ATGNRs) with symmetric and asymmetric structures is investigated using a nearest-neighbour, tight-binding (TB) model. ATGNRs structural symmetry two sub-lattice structure exhibit Dirac points at zero strain. Application to these systems induces multiple under compression (up -20% strain), the number commensurate tetra-carbon base-units along width unit cell, accounting also for mirror structure. Under tensile, 20% extension),...
The magnetic properties and nature of the persistent current in small flux-penetrated $t\text{\ensuremath{-}}{t}^{\ensuremath{'}}\text{\ensuremath{-}}U$ rings are investigated. An effective rigid-rotator description is formulated for this system, which coincides with a transition to ferromagnetic state model. criteria onset rigid rotation given. model used understand continuum ground-state solutions two-dimensional few-particle hard-wall quantum dot, where found even without Zeeman coupling...
The combined effects of an asymmetric (square or V-shaped) notch and uniaxial strain are studied in a zigzag graphene nanoribbon (ZGNR) device using generalized tight-binding model. spin-polarization conductance-gap properties, calculated within the Landauer–B¨uttiker formalism, were found to be tunable for along ribbon-length ribbon-width ideal ZGNR square (V-shaped) notched systems. Uniaxial strains 10% initiated significant notch-dependent reductions conduction-gap. For V-shaped notch,...
In order to control the exchange coupling between grains in a perpendicular recording media, simple method is totally decouple using thick oxide and apply continuous magnetic capping layer improve uniformity of coupling. this paper, system CoPt coupled with Co investigated an atomistic spin model. We show that has impact on reversal process grains, as well causing reduction coercivity whole system. Further, we have studied function parameter layer, found sharp decrease coercivity. The...
Contrails are clouds formed by aircraft (Glossary of Meteorology, 2000). A contraction the two words condensation trails, −contrails result water vapour from combustion in engines during flight, which is then exhausted, cooled, and condensed. They were first observed early days aviation (see http://contrailscience.com/pre-wwii-contrails/), with some initial scientific reports documented Scientific American (Well, 1919), Monthly Weather Review (Varney, 1921a; 1921b), Nature (1930) – last...
Localized spin switching, as determined by inspection of the exact solution two-site correlation function, has been theoretically realized in inhomogeneous, finite Hubbard chains consisting nonmagnetic $N$ and magnetic $M$ atoms. The generic form structure is $NMMMMMN$, with switching occurring only at $N∕M$ interface a function increasing electron filling. activated via application an external field. Minor ``tweaking'' field can be used to optimize spin-switching properties temperature.