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Arlington, TX, United States

The University of Texas at Arlington is a state university located in Arlington, Texas. The campus is situated southwest of downtown Arlington, and is located in the Dallas–Fort Worth–Arlington metropolitan area. The university was founded in 1895 and served primarily a military academy during the early 20th century. After spending several decades in the Texas A&M University System, the institution joined the University of Texas System in 1965. In the fall of 2014, UTA reached a student population of nearly 35,000, a gain of 65% from autumn 2001, and is currently the second-largest institution within the UT System. UTA is classified by the Carnegie Foundation as a "High Research Activity" institution and named one of the fastest growing public research universities in the nation. The university offers 80 baccalaureate, 74 masters, and 31 doctoral degrees.The university also operates the Fort Worth Education Center and the UTA Research Institute, with campuses at the Fort Worth ITC and River Bend Park. Wikipedia.

Cuntz M.,University of Texas at Arlington
Astrophysical Journal | Year: 2014

A comprehensive approach is provided for the study of both S-type and P-type habitability in stellar binary systems, which in principle can also be expanded to systems of higher order. P-type orbits occur when the planet orbits both binary components, whereas in the case of S-type orbits, the planet orbits only one of the binary components with the second component considered a perturbator. The selected approach encapsulates a variety of different aspects, which include: (1) the consideration of a joint constraint, including orbital stability and a habitable region for a putative system planet through the stellar radiative energy fluxes ("radiative habitable zone"; RHZ), needs to be met; (2) the treatment of conservative, general, and extended zones of habitability for the various systems as defined for the solar system and beyond; (3) the provision of a combined formalism for the assessment of both S-type and P-type habitability; in particular, mathematical criteria are presented for the kind of system in which S-type and P-type habitability is realized; (4) applications of the attained theoretical approach to standard (theoretical) main-sequence stars. In principle, five different cases of habitability are identified, which are S-type and P-type habitability provided by the full extent of the RHZs; habitability, where the RHZs are truncated by the additional constraint of planetary orbital stability (referred to as ST- and PT-type, respectively); and cases of no habitability at all. Regarding the treatment of planetary orbital stability, we utilize the formulae of Holman & Wiegert as also used in previous studies. In this work, we focus on binary systems in circular orbits. Future applications will also consider binary systems in elliptical orbits and provide thorough comparisons to other methods and results given in the literature. © 2014. The American Astronomical Society. All rights reserved.. Source

Feschotte C.,University of Texas at Arlington | Gilbert C.,CNRS Ecobiological Interactions
Nature Reviews Genetics | Year: 2012

Recent studies have uncovered myriad viral sequences that are integrated or 'endogenized' in the genomes of various eukaryotes. Surprisingly, it appears that not just retroviruses but almost all types of viruses can become endogenous. We review how these genomic 'fossils' offer fresh insights into the origin, evolutionary dynamics and structural evolution of viruses, which are giving rise to the burgeoning field of palaeovirology. We also examine the multitude of ways through which endogenous viruses have influenced, for better or worse, the biology of their hosts. We argue that the conflict between hosts and viruses has led to the invention and diversification of molecular arsenals, which, in turn, promote the cellular co-option of endogenous viruses. © 2012 Macmillan Publishers Limited. All rights reserved. Source

Mohanty S.,University of Texas at Arlington
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2012

The single beam optical trap (optical tweezers), a highly focused beam, is on its way to revolutionizing not only the fields of colloidal physics and biology, but also materials science and engineering. Recently, spatially-extended three-dimensional light patterns have gained considerable usage for exerting force to alter, manipulate, organize and characterize materials. To advance the degree of manipulation, such as rotation of materials in microfluidic environments along with spatial structuring, other beam parameters such as phase and polarization have to be configured. These advances in optical tweezers' technology have enabled complex microfluidic actuation and sorting. In addition to remotely (in a non-contact way) applying force and torques in three-dimensions, which can be continuously varied unlike mechanical manipulators, optical tweezers-based methods can be used for sensing the force of interaction between microscopic objects in a microfluidic environment and for the characterization of micro-rheological properties. In this review, we place emphasis on applications of optical actuation based on novel beams in performing special functions such as rotation, transportation, sorting and characterization of the microscopic objects. Further, we have an extended discussion on optical actuation (transport and rotation) with fiber optic microbeams and spectroscopic characterization in the microfluidic environment. All these advancements in optical manipulation would further facilitate the growing use of optical tools for complex microfluidic manipulations. © 2012 The Royal Society of Chemistry. Source

Passy S.I.,University of Texas at Arlington
Ecology Letters | Year: 2012

The relationships of local population density (N) with body size (M) and distribution (D) have been extensively studied because they reveal how ecological and historical factors structure species communities; however, a unifying model explaining their joint behaviour, has not been developed. Here, I propose a theory that explores these relationships hierarchically and predicts that: (1) at a metacommunity level, niche breadth, population density and regional distribution are all related and size-dependent and (2) at a community level, the exponents b and d of the relationships N ~ M b and N ~ D d are functions (f) of the environment and, consequently, species richness (S), allowing the following reformulation of the power laws: N ~ M f(S) and N ~ D f(S). Using this framework and continental data on stream environment, diatoms, invertebrates and fish, I address the following fundamental, but unresolved ecological questions: how do species partition their resources across environments, is energetic equivalence among them possible, are generalists more common than specialists, why are locally abundant species also regionally prevalent, and, do microbes have different biogeography than macroorganisms? The discovery that community scaling behaviour is environmentally constrained calls for better integration of macroecology and environmental science. Idea and Perspective Ideas and Perspectives © 2012 Blackwell Publishing Ltd/CNRS. Source

Magnusson R.,University of Texas at Arlington
Optics Letters | Year: 2012

We present the spectral properties of multiline guided-mode resonance filters designed with extremely thick dielectric films. We treat a dielectric membrane in air with a subwavelength grating inscribed into one surface. As the film is very thick on the scale of the wavelength, it supports a large number of resonant modes. In general, the resonant modes yield a dense reflectance spectrum with irregular appearance. We show that by placing an antireflection layer on the backside of the slab, the interference between the directly transmitted zero order and the diffracted order generating the waveguide modes is eliminated. Thus, a well-shaped, unperturbed comb-like spectrum is realized. A titanium dioxide membrane that is 500 μm thick generates a spectrum with more than 1000 channels separated by e0.8 nm near the 1.55 μm wavelength. © 2012 Optical Society of America. Source

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