Accuracy of stellar parameters of exoplanet-host stars determined from asteroseismology

In the context of the space-based mission CoRoT, devoted to asteroseismology and search for planet transits, we analyse the accuracy of fundamental stellar parameters (mass, radius, luminosity) that can be obtained from asteroseismological data.} Our work is motivated by the large uncertainties on planetary radius determination of transiting planets which are mainly due to uncertainties on the stellar parameters. Our goal is to analyse uncertainties of fundamental stellar parameters for a given accuracy of oscillation frequency determination. We generate grids of equilibrium models of stars and compute their pulsation spectra based on a linear nonadiabatic stability analysis. Using differents methods of comparison of oscillation mode spectra, we derive uncertainties on fundamental stellar parameters and analyse the effect of varying the number of considered modes.} The limits obtained depend strongly on the adapted method to compare spectra. We find a degeneracy in the stellar parameter solutions, up to a few % in mass (from less than 1% to more than 7% depending on the method used and the number of considered modes), luminosity (from 2% to more than 10%) or radius (from less than 1% to 3%), for a given pulsation spectrum.Comment: 7 pages, 9 figure

Releasing the Caged Bird: A Case for Twitter as a Common Carrier

Social media platforms have become influential in shaping public discourse. These digital platforms have established new modes of communication that enable individuals from different ethnic, political, and racial backgrounds to come together and discuss contentious issues in online public forums. Yet, as these platforms continue to grow, their unfettered control over online speech increases. Legal scholars and Supreme Court Justices have examined these platforms’ control over speech, putting forth various legal theories to combat censorial practices, but have not agreed upon a solution. To provide a legal framework for legal scholars and courts to consider, this Note will look deeper into the issue of censorship on social media, adopting a focused lens. Specifically, it will explore the feasibility of imposing common carrier responsibilities on one of the leading social media platforms, Twitter. It will assess the functionalities of the platform and how these mechanisms contribute to the indiscriminate regulation of user speech. Additionally, it will historically examine the common carrier doctrine, scrutinizing alternative common carrier theories that arose from the doctrine while advocating, adopting, and applying Eugene Volokh’s compelled hosting doctrine to Twitter. This Note concludes by assessing privatized regulation through an analysis of Elon Musk’s acquisition of Twitter

Design and fabrication of a low-specific-weight parabolic dish solar concentrator

A segmented design and fabrication and assembly techniques were developed for a 1.8 m (6 ft) diameter parabolic concentrator for space application. This design and these techniques were adaptable to a low cost, mass-produced concentrator. Minimal machining was required. Concentrator segments of formed magnesium were used. The concentrator weighed only 1.6 kg sq m (0.32 lbm/sq ft)

Nutritional Barriers for Patients with Diabetes: A quality improvement project

The goal of this study was to look at health care providers perspectives on what the nutritional barriers patients with diabetes faced and compare that with the patient\u27s perspectives. We also assessed patients knowledge on certain foods and if they have carbohydrates. We used this information to create a Notecard that could be given to patients.https://scholarworks.uvm.edu/fmclerk/1713/thumbnail.jp

Cryoelectron microscopy of vitrified sections: a new challenge for the analysis of functional nuclear architecture

Cryoelectron microscopy of vitrified sections has become a powerful tool for investigating the fine structural features of cellular compartments. In the present study, this approach has been applied in order to explore the ultrastructural morphology of the interphase nucleus in different mammalian cultured cells. Rat hepatoma, Chinese hamster ovary and Potorus kidney cells were cryofixed by high-pressure freezing and the cryosections were examined at low temperature by transmission electron microscopy. Our results show that while the contrast of nuclear structural domains is remarkably homogeneous in hydrated sections, some of them can be recognised due to their characteristic texture. Thus, condensed chromatin appears finely granular and the perichromatin region contains rather abundant fibro-granular elements suggesting the presence of dispersed chromatin fibres and of perichromatin fibrils and granules. The interchromatin space looks homogeneous and interchromatin granules have not been identified under these preparative conditions. In the nucleolus, the most striking feature is the granular component, while the other parts of the nucleolar body, which appear less contrasted, are difficult to resolve. The nuclear envelope is easily recognisable with its regular perinuclear space and nuclear pore complexes. Our observations are discussed in the context of results obtained by other, more conventional electron microscopic method

Isu Global Keamanan Pangan Kacang Tanah II: Protein Ara H sebagai Alergen

Konsumsi kacang tanah (Arachis hypogaea L.) dapat menimbulkan alergi dengan gejala ringan hingga berat, bahkan dapat menimbulkan kematian bagi pasien yang hipersensitif. Peristiwa ini umum terjadi di negara-negara barat, sehingga menjadi salah satu isu global keamanan pangan kacang tanah. Konsumsi kacang tanah dalam jumlah yang sedikit, mulai dari 100 μg mampu memicu terjadinya alergi. Hingga saat ini terdapat 13 protein kacang tanah, yaitu Ara h1 hingga Ara h13 yang sudah diidentifikasi dan dikarakterisasi. Mayoritas sumber alergen tersebut termasuk dalam seed storage protein. Di antara ke-13 protein Ara h tersebut, Ara h1, Ara h2 dan Ara h3 dikategorikan sebagai alergen utama karena dapat dikenali oleh > 50% serum IgE pasien. Ara h1 dan Ara h2 bersifat tahan terhadap perlakuan suhu dan enzim pencernaan. Tulisan ini mengulas secara komprehensif isu alergen yang disebabkan oleh protein Ara h dan beberapa pendekatan yang sudah dilakukan untuk mengurangi terjadinya alergi ditinjau dari aspek penurunan kandungan Ara h. Beberapa pendekatan untuk mengeliminasi Ara h pada kacang tanah antara lain pengolahan, rekayasa genetika, pemuliaan konvensional selektif dan perlakuan menggunakan enzim. Kombinasi dari beberapa perlakuan akan memberikan hasil lebih baik untuk menurunkan kandungan Ara h