Pete

https://digitalcommons.library.umaine.edu/mmb-vp/4289/thumbnail.jp

The correlation potential in density functional theory at the GW-level: spherical atoms

As part of a project to obtain better optical response functions for nano materials and other systems with strong excitonic effects we here calculate the exchange-correlation (XC) potential of density-functional theory (DFT) at a level of approximation which corresponds to the dynamically- screened-exchange or GW approximation. In this process we have designed a new numerical method based on cubic splines which appears to be superior to other techniques previously applied to the "inverse engineering problem" of DFT, i.e., the problem of finding an XC potential from a known particle density. The potentials we obtain do not suffer from unphysical ripple and have, to within a reasonable accuracy, the correct asymptotic tails outside localized systems. The XC potential is an important ingredient in finding the particle-conserving excitation energies in atoms and molecules and our potentials perform better in this regard as compared to the LDA potential, potentials from GGA:s, and a DFT potential based on MP2 theory.Comment: 13 pages, 9 figure

Mice Transgenic for the Human Carcinoembryonic Antigen Gene Maintain Its Spatiotemporal Expression Pattern

The tumor marker carcinoembryonic antigen (CEA) is predominantly expressed in epithelial cells along the gastrointestinal tract and in a variety of adenocarcinomas. As a basis for investigating its in vivo regulation and for establishing an animal model for tumor immunotherapy, transgenic mice were generated with a 33-kilobase cosmid clone insert containing the complete human CEA gene and flanking sequences. CEA was found in the tongue, esophagus, stomach, small intestine, cecum, colon, and trachea and at low levels in the lung, testis, and uterus of adult mice of independent transgenic strains. CEA was first detected at day 10.5 of embryonic development (embryonic day 10.5) in primary trophoblast giant cells and was found in the developing gut, urethra, trachea, lung, and nucleus pulposus of the vertebral column from embryonic day 14.5 onwards. From embryonic day 16.5 CEA was also visible in the nasal mucosa and tongue. Because this spatiotemporal expression pattern correlates well with that known for humans, it follows that the transferred genomic region contains all of the regulatory elements required for the correct expression of CEA. Furthermore, although mice apparently lack an endogenous CEA gene, the entire repertoire of transcription factors necessary for correct expression of the CEA transgene is conserved between mice and humans. After tumor induction, these immunocompetent mice will serve as a model for optimizing various forms of immunotherapy, using CEA as a target antigen

A machine walks into an exhibit:A technical analysis of art curation

Contemporary art consumption is predominantly online, driven by algorithmic recom- mendation systems that dictate artwork visibility. Despite not being designed for curation, these algorithms’ machinic ways of seeing play a pivotal role in shaping visual culture, influencing artistic creation, visibility, and associated social and financial benefits. The Algorithmic Pedestal was a gallery, practice-based research project that reported gallerygoers’ perceptions of a human’s curation and cu- ration achieved by Instagram’s algorithm. This paper presents a technical analysis of the same exhibit using computer vision code, offering insights into machines’ perception of visual art. The computer vision code assigned values on various metrics to each image, allowing statistical comparisons to identify differences between the collections of images selected by the human and the algorithmic system. The analysis reveals statistically significant differences between the exhibited images and the broader Metropolitan Museum of Art digital collection. However, the analysis found minimal distinctions between human-curated and Instagram-curated images. This study contributes insights into the perceived value of the curation process, shedding light on how audiences perceive artworks differently from machines using computer vision

The Effect of pH on Pure Cultures of Euglena Mutabilis

Author Institution: Department of Physiology, Georgetown University School of Medicine, Washington, D. C

Factors Which Affect the Growth of a Colorless Flagellate, Astasia Klebsii, in Pure Cultures

Author Institution: Mary S. Muellhaupt Scholar in Zoology, The Ohio State Universit

A simple modification converts the spinning cup protein sequencer into a vapour-phase sequencer

AbstractA spinning cup sequencer was converted into a vapour-liquid-solid phase instrument by replacing the chemical delivery valves with a simplified version of the Wittmann valve. The cup assembly was replaced by a Kel-F cartridge and the vacuum system slightly modified and fitted with a cold trap. The modification is inexpensive, easily performed and does not lead to the loss of the spinning cup capability of the instrument. The modified sequencer is easy to operate, reduces consumption of chemicals and exhibits a cycle time of 1 h. Small and larger peptides in amounts from 0.2–30 nmol were successfully degraded.Spinning cup protein sequencerVapour-phase sequencerProtein structur

First principles studies of modulated Co/Cu superlattices with strongly and weakly exchange biased Co-monolayers

First-principles calculations have been performed in order to determine effective exchange integrals between {\it strongly} and {\it weakly} exchange-coupled Co monolayers in certain modulated periodic $CoCu_2/CoCu_n$-type superlattices with three non-equivalent Co planes, which have not yet been studied hitherto. For $3\le n\le 6$ we find that the two non-equivalent exchange integrals have opposite signs, i.e.~the strong coupling is antiferromagnetic and the weak coupling ferromagnetic, and differ for $n\ne 4$ from each other by one order of magnitude. It is shown that the results depend on the system as a whole and could not be obtained from separate parts. Finally we suggest that ''spin valve'' systems of such kind should be considered when trying to obtain good magneto-resistance together with low switching-fields.Comment: LaTex, 9 pages, including two .eps-figure

Opening Service 9-15-68

Dr. Huegli preaches on Romans 10:8-17.https://scholar.csl.edu/opening_services/1016/thumbnail.jp