A5086666658- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Electrospun Nanofibers in Biomedical Applications
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Advanced Fluorescence Microscopy Techniques
- Tissue Engineering and Regenerative Medicine
- Mass Spectrometry Techniques and Applications
- Isotope Analysis in Ecology
- Cellular Mechanics and Interactions
- Atmospheric Ozone and Climate
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Graphene and Nanomaterials Applications
- Advanced Electron Microscopy Techniques and Applications
- Cardiac, Anesthesia and Surgical Outcomes
- Astronomical and nuclear sciences
- Geophysics and Gravity Measurements
- Obstructive Sleep Apnea Research
- Advanced Biosensing Techniques and Applications
- Neurogenesis and neuroplasticity mechanisms
- 3D Printing in Biomedical Research
- Earth Systems and Cosmic Evolution
University of Southern Maine
2024
Rice University
2020-2023
The University of Texas at Austin
2018-2022
Institut de Virologie
2021
Lamar University
2020
John Wiley & Sons (United States)
2019
Smith College
2019
Syracuse University
2019
University of Memphis
2019
Texas A&M University
2019
One of the high-level goals Galactic archaeology is chemical tagging stars across Milky Way to piece together its assembly history. For this work, born must be uniquely chemically homogeneous. Wide binary systems are an important laboratory test underlying assumption. Here we present detailed abundance patterns 50 25 wide comprised main-sequence similar spectral type identified in Gaia DR2 with aim quantifying their level homogeneity. Using high-resolution spectra obtained McDonald...
We sought to determine the contribution of scaffold topography migration and morphology neural stem cells by mimicking anatomical features scaffolds found in vivo. mimicked two types central nervous system encountered during development vitro constructing different diameter electrospun polycaprolactone (PCL) fiber mats, a substrate that we have shown be topographically similar brain scaffolds. compared effects large fibers (made mimic blood vessel topography) with those small-diameter radial...
Cell-seeded scaffolds play critical roles in the production of tissue engineered intestine (TEI), a potential strategy for treatment short bowel syndrome. The current study compares polyglycolic acid (PGA), polycaprolactone (PCL), and collagen as TEI production. Tubular PGA were prepared from nonwoven BIOFELT® . PCL fabricated by electrospinning. using CollaTape, wound dressing material. Both coated with poly-l-lactic (PLLA) to improve scaffold mechanical properties. Pore size, porosity,...
Comoving pairs, even at the separations of $\mathcal{O}(10^6)\,$AU, are a predicted reservoir conatal stars. We present detailed chemical abundances 62 stars in 31 comoving pairs with $10^2 - 10^7\,$AU and 3D velocity differences $< 2 \mathrm{\ km \ s^{-1}}$. This sample includes both bound pairs/wide binaries unbound pairs. Observations were taken using MIKE spectrograph on Magellan/Clay Telescope high resolution ($\mathrm{R} \sim 45,000$) typical signal-to-noise ratio 150 per pixel. With...
The characteristics of the stellar populations in Galactic Bulge inform and constrain Milky Way's formation evolution. metal-poor population is particularly important light cosmological simulations, which predict that some oldest stars Galaxy now reside its center. bulge appears to consist multiple require dynamical analyses disentangle. In this work, we undertake a detailed chemodynamical study inner Galaxy. Using R$\sim$ 20,000 VLT/GIRAFFE spectra 319 (-2.55 dex$\leq$[Fe/H]$\leq$0.83 dex,...
Novel therapies are crucially needed for short bowel syndrome. One potential therapy is the production of tissue engineered intestine (TEI). The intestinal environment presents significant challenges to selection appropriate material engineering scaffolds. Our goal was characterize different scaffold materials downselect that best suited TEI production. To investigate this, various tubular scaffolds were implanted into peritoneal cavity adult rats and harvested at multiple time-points....
Patterning neuronal cells and guiding neurite growth are important for applications such as prosthetics, cell based biosensors, tissue engineering. In this paper, a microdevice is presented that provides patterning guided on collagen coated gelatin/PCL nanofiber mat. The pattern consisted of grid polystyrene microwells/nodes to confine the bodies orthogonal grooves guide from each node. Vacuum assisted seeding was used localize in microwells physically separate during seeding. electrospun...
The Velum, Oropharynx, Tongue base and Epiglottis (VOTE) classification on drug-induced sleep endoscopy (DISE) is used widely for obstructive apnea (OSA) syndrome, though research into comparative physical examinations with VOTE DISE still limited. aim of this study was to evaluate the relationship between findings in patients OSA. Fifty-five OSA were enrolled retrospective study. All received clinical explorations including a Brodsky classification, modified Mallampati score (MMS),...
Abstract Phosphorus (P) is a critical element for life on Earth, yet the cosmic production sites of P are relatively uncertain. To understand how has evolved in solar neighborhood, we measured abundances 163 FGK stars over range –1.09 < [Fe/H] 0.47 using observations from Habitable-zone Planet Finder instrument Hobby–Eberly Telescope. Atmospheric parameters were calculated by fitting combination astrometry, photometry, and Fe I line equivalent widths. matching synthetic spectra to feature...
Abstract Little is known about the origin of fastest stars in Galaxy. Our understanding chemical evolution history Milky Way and surrounding dwarf galaxies allows us to use composition a star investigate its say whether it was formed situ or accreted. However, stars, hypervelocity are young massive their has not yet been analyzed. Though difficult analyze star, we well versed analysis late-type stars. We have used high-resolution ARCES/3.5 m Apache Point Observatory, MIKE/Magellan spectra...
A facile method is developed to functionalize nanofiber surfaces with nanoparticles (NPs) through dithiocarbamate chemistry. Gold (AuNPs) and quantum dots (QDs) are immobilized on the surface. These provide scaffolds for further supramolecular functionalization, as demonstrated Förster resonance energy transfer (FRET) pairing of QD‐decorated fibers fluorescent proteins. image
Aligned fibers have been shown to facilitate cell migration in the direction of fiber alignment while oxygen (O2 )-carrying solutions improve metabolism cells hypoxic culture. Therefore, U251 aggregate on poly(ε-caprolactone) (PCL)-aligned was studied culture media supplemented with O2 storage and transport protein hemoglobin (Hb) obtained from bovine, earthworm human sources at concentrations ranging 0 5 g/L within a incubator exposed tensions 1 19% . Individual quantified using wound...
We use WIYN High-resolution Infrared Camera H-band (1.6 μm) imaging, archival Spitzer, Hubble Space Telescope, and Galaxy Evolution Explorer data simulations, from the literature to argue for presence of a strong end-on bar in nearby spiral galaxy NGC 6503. The evidence consists both photometric kinematic signatures as well resonant structures present which are most often associated with bars. These include central peak followed by plateau surface brightness profile, an extreme decrement...
We sought to determine the contribution of scaffold topography migration and morphology neural stem cells by mimicking anatomical features scaffolds found in vivo. mimicked two types central nervous system encountered during development vitro constructing different diameter electrospun polycaprolactone (PCL) fiber mats, a substrate that we have shown be topographically similar brain scaffolds. compared effects large fibers (made mimic blood vessel topography) with those small-diameter radial...
Substrate rigidity modulates cell mechanics, which affect migration and proliferation. Quantifying the effects of substrate on cancer mechanics requires a quantifiable parameter that can be measured for individual cells, as well platform with being only variable. Here we used single-cell force spectroscopy to pull cells substrates varying in rigidity, extracted from force–distance curves quantify properties membrane tethers. Our results showed tether increases until it reaches its asymptotic...
Abstract We present high spectral resolution optical observations of comet 21P/Giacobini–Zinner from six nights in 2018. The were obtained with the Tull Coudé Spectrograph on 2.7 m Harlan J. Smith Telescope McDonald Observatory. This comet’s spectrum shows strong depletions C 2 , 3 CH, and NH relative to CN. explore what it means for a be depleted show that all species are at similar line intensities within molecular band compared typical comet. represent much lower abundance studied.
Abstract The detection and characterization of young planetary systems offer a direct path to study the processes that shape planet evolution. We report on discovery sub-Neptune-sized orbiting star HD 110082 (TOI-1098). Transit events we initially detected during TESS Cycle 1 are validated with time-series photometry from Spitzer. High-contrast imaging high-resolution, optical spectra also obtained characterize stellar host confirm nature transits. is late-F dwarf ( M ⋆ = 1.2 ⊙ ) low-mass,...
We modeled observations of the C2 d3Πg-a3Πu (Swan) Δν = 0 sequence observed in spectra comet 122P/de Vico obtained with 2.7 m Harlan J. Smith Telescope and Tull Coude spectrograph McDonald observatory on 10/3/1995 10/4/1995. The data used spanned 4986-5169 Å at R λ/Δλ 60 000. PGOPHER molecular model to generate fit synthetic d3Πg having one two rotational temperatures. found that excited state had a two-component temperature, similar for Halley. spectrum was sufficiently high quality local...
Two decades on, the study of hypervelocity stars is still in its infancy. These can provide novel constraints on total mass Galaxy and Dark Matter distribution. However how these are accelerated to such high velocities unclear. Various proposed production mechanisms for be distinguished using chemo-dynamic tagging. The advent Gaia other large surveys have provided hundreds candidate hyper velocity objects target ground based resolution follow-up observations. We conduct spectroscopic...
ABSTRACT Two decades on, the study of hypervelocity stars is still in its infancy. These can provide novel constraints on total mass Galaxy and dark matter distribution. However how these are accelerated to such high velocities unclear. Various proposed production mechanisms for be distinguished using chemo-dynamic tagging. The advent Gaia other large surveys have provided hundreds candidate hyper velocity objects target ground-based high-resolution follow-up observations. We conduct...
The United States National Academies of Science and Engineering have issued a grand challenge to “reverse-engineer the brain”. Addressing this requires more complete understanding how connections between individual neurons groups are formed maintained, as well thorough elucidation signaling processes that drive neural network optimization. However, achieve these goals, it is first necessary develop appropriate fundamental tools protocols for adaptive biointerfacing, bottom-up neuroscience,...