A5024718583- Astro and Planetary Science
- High-pressure geophysics and materials
- Planetary Science and Exploration
- X-ray Diffraction in Crystallography
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Nuclear Physics and Applications
- Radioactive element chemistry and processing
- Rock Mechanics and Modeling
- Calcium Carbonate Crystallization and Inhibition
- X-ray Spectroscopy and Fluorescence Analysis
- Crystal Structures and Properties
- Geochemistry and Geologic Mapping
- Mine drainage and remediation techniques
- Clay minerals and soil interactions
- Advanced Condensed Matter Physics
- Metal Extraction and Bioleaching
- Hydrocarbon exploration and reservoir analysis
- Radioactive contamination and transfer
- Iron oxide chemistry and applications
- Mining and Resource Management
- Concrete and Cement Materials Research
- Crystallization and Solubility Studies
- Stellar, planetary, and galactic studies
- Spacecraft and Cryogenic Technologies
Natural History Museum
2016-2025
University of Cambridge
2021
Redx Pharma (United Kingdom)
2020
Macclesfield College
2020
Florence (Netherlands)
2019
University of Oxford
2018
University of Arizona
2017
American Museum of Natural History
2008-2013
AstraZeneca (United Kingdom)
2002-2012
German Oceanographic Museum
2001-2002
Abstract On September 24, 2023, NASA's OSIRIS‐REx mission dropped a capsule to Earth containing ~120 g of pristine carbonaceous regolith from Bennu. We describe the delivery and initial allocation this asteroid sample introduce its bulk physical, chemical, mineralogical properties early analyses. The is very dark overall, with higher‐reflectance inclusions particles interspersed. Particle sizes range submicron dust stone ~3.5 cm long. Millimeter‐scale larger stones typically have hummocky or...
Abstract Evaporation or freezing of water-rich fluids with dilute concentrations dissolved salts can produce brines, as observed in closed basins on Earth 1 and detected by remote sensing icy bodies the outer Solar System 2,3 . The mineralogical evolution these brines is well understood regard to terrestrial environments 4 , but poorly constrained for extraterrestrial systems owing a lack direct sampling. Here we report occurrence salt minerals samples asteroid (101955) Bennu returned...
PURPOSE: A prospective, randomized clinical trial was conducted by the Northwest Rectal Cancer Group to study effects of preoperative radiotherapy given one week before surgery in locally advanced (tethered or fixed) rectal carcinoma. METHODS: total 284 patients were entered into between 1982 and 1986; 141 allocated receive surgical treatment alone, 143 radiotherapy. 10 × cm volume posterior pelvis, centered on tumor, irradiated at a dose 20 Gy, divided four daily fractions 5 Gy each....
Abstract Mackinawite, tetragonal FeS, has been synthesised by reacting iron with Na 2 S solutions. A Rietveld structure refinement of X-ray powder diffraction data, recorded using X-rays monochromated from synchrotron radiation a wavelength 0.6023 Å, performed. The refined in the space group, P 4/ nmm , and following cell parameters: = 3.6735(4), c 5.0328(7) V 67.914(24) Å 3 . Our shows that FeS 4 tetrahedron mackinawite is almost perfectly regular, much smaller distortion than previously...
The CI chondrites are some of the most hydrated meteorites available to study, making them ideal samples with which investigate aqueous processes in early Solar System. Here, we have used position-sensitive-detector X-ray diffraction (PSD-XRD) quantify abundance minerals bulk chondrite falls Alais, Orgueil and Ivuna, Antarctic CI-like Y-82162 Y-980115. We find that Ivuna dominated by a mixed serpentine/saponite phyllosilicate (81–84 vol%), plus minor magnetite (6–10%), sulphides (4–7%)...
We report new mineralogical, petrographic and noble gas analyses of the carbonaceous chondrite meteorites Y-82162 (C1/2ung), Y-980115 (CI1), Y-86029 Y-86720 (C2ung), Y-86789 B-7904 (C2ung). Combining our results with literature data we show that these experienced varying degrees aqueous alteration followed by short-lived thermal metamorphism at temperatures >500 °C. These have similar mineralogy, textures chemical characteristics suggesting they are genetically related, strongly support...
Direct links between carbonaceous chondrites and their parent bodies in the solar system are rare. The Winchcombe meteorite is most accurately recorded chondrite fall. Its pre-atmospheric orbit cosmic-ray exposure age confirm that it arrived on Earth shortly after ejection from a primitive asteroid. Recovered only hours falling, composition of largely unmodified by terrestrial environment. It contains abundant hydrated silicates formed during fluid-rock reactions, carbon- nitrogen-bearing...
Other| April 01, 1997 Transformation of mackinawite to greigite; an in situ X-ray powder diffraction and transmission electron microscope study Alistair R. Lennie; Lennie University Manchester, Department Earth Sciences, United Kingdom Search for other works by this author on: GSW Google Scholar Simon A. T. Redfern; Redfern Pamela E. Champness; Champness Chris P. Stoddart; Stoddart Paul F. Schofield; Schofield David J. Vaughan American Mineralogist (1997) 82 (3-4): 302–309....
The CI and CI-like chondrites provide a record of aqueous alteration in the early solar system. However, differ having also experienced late stage period thermal metamorphism. In order to constrain nature extent alteration, we have investigated bulk mineralogy abundance H2O using thermogravimetric analysis infrared spectroscopy. Ivuna Orgueil show significant mass loss (28.5–31.8 wt.%) upon heating 1000 °C due dehydration dehydroxylation abundant phyllosilicates Fe-(oxy)hydroxides...
Abstract The CM carbonaceous chondrite meteorites experienced aqueous alteration in the early solar system. They range from mildly altered type 2 to almost completely hydrated 1 chondrites, and offer a record of geochemical conditions on water‐rich asteroids. We show that chondrites contain abundant (84–91 vol%) phyllosilicate, plus olivine (4–8 vol%), magnetite (2–3 Fe‐sulfide (<5 calcite (<2 vol%). 1/2 phyllosilicate (71–88 (4–20 enstatite (2–6 Fe‐sulfides (1–2 (~1 As progressed,...
The cell parameters of deuterated gypsum have been extracted from Rietveld analysis powder neutron diffraction data within the temperature range 4.2-320 K. thermal expansion is highly anisotropic along b axis principally because effect D2.. .01 hydrogen bond. high-temperature limits for coefficients edges a, b, and care 3.98 x 10-6,4.36 X 10-5, 2.53 10-5 K-l, respectively, volume limit 6.96 K-l. (3angle displays oscillatory variation, reflecting a change in influence at least two coupled...
G protein coupled receptor 119 (GPR119) is viewed as an attractive target for the treatment of type 2 diabetes and other elements metabolic syndrome. During a program toward discovering agonists GPR119, we herein describe optimization initial lead compound, 2, into development candidate, 42. A key challenge in this work was insolubility compound. Small-molecule crystallography utilized to understand intermolecular interactions solid state resulted switch from aryl sulphone 3-cyanopyridyl...
The rehabilitation of legacy mines continues to be a big challenge because the difficulties in returning them safe and stable conditions ensuring that mined-out areas become productive support economic activity host community. Previous efforts are often focused on purely technical environmental aspects, leading resistance from local community due their exclusion process. To address issues associated with lack participation community, we have developed project, Biodiversity Positive Mining...
The CY chondrites are a group of thermally metamorphosed carbonaceous chondrites. Although they share similarities with the CM and CI chondrites, their primary properties argue for distinct classification. Previous studies have highlighted isotopically heavy bulk compositions (δ17O=10 ‰, δ18O=21 Δ17O=0 ‰) exceptionally high sulphide abundances (10-30 vol%). In this work we explore petrography alteration history. CYs accreted low chondrules (15-20 area%) average apparent diameters slightly...
On 24 September 2023, the NASA OSIRIS-REx mission dropped a capsule to Earth containing approximately 120 g of pristine carbonaceous regolith from Bennu. We describe delivery and initial allocation this asteroid sample introduce its bulk physical, chemical, mineralogical properties early analyses. The is very dark overall, with higher-reflectance inclusions particles interspersed. Particle sizes range sub-micron dust stone about 3.5 cm long. Millimeter-scale larger stones typically have...
Many biominerals form from amorphous calcium carbonate (ACC), but this phase is highly unstable when synthesised in its pure inorganically. Several species of earthworm secrete granules which contain stable ACC. We analysed the milky fluid and solid for amino acid (by liquid chromatography) functional group Fourier transform infrared (FTIR) spectroscopy) compositions. Granule elemental composition was determined using inductively coupled plasma-optical emission spectroscopy (ICP-OES)...