Stray light analysis of the Diffuse Infrared Background Experiment (DIRBE)

The straylight analysis of the diffuse infrared background experiment (DIRBE) on the cosmic background explorer (COBE) mission is discussed. From the statement of work (SOW), the purpose of DIRBE is to measure, or set upper limits on, the spectral and spatial character of the diffuse extra galactic infrared radiation. Diffuse infrared sources within our own galaxy are measured. The required reduction of the unwanted radiation imposes severe design and operating restrictions on the DIRBE instrument. To accomplish its missions, it will operate at a multitude of wavelengths ranging from 1.25 um out to 200 to 300 microns. The operating bands and the required point source normalized irradiance transmittance (PSNIT) are shown. The important straylight concepts in the DIRBE design are reviewed. The model and assumptions used in APART analysis are explained. The limitations due to the scalar theory used in the analysis are outlined

Stray light in the Infrared Astronomical Satellite (IRAS)

Changes made to the telescope and critical objects considered in modeling these changes into the APART program are described. The optical system was analyzed for scattered light, diffracted then scattered radiation, and thermally emitted radiation. The damaged area of the primary to mirror was also examined. Results are presented in tables and graphs

An n-terminal acidic domain in β-amylase2 is required for k+ regulation.

In the chloroplasts of leaf mesophyll cells, β-amylase proteins (BAMs) are responsible for breaking down starch into maltose when the plant cannot undergo photosynthesis. BAM2, which was previously considered inactive, was recently shown to be active under stromal-like levels of salt and has optimal activity at 80mM KCl. In addition, BAM2 is active as a tetramer in vivo and displays sigmoidal kinetics due to a secondary binding site that is responsible for activating BAM2 when bound to starch. A hypothesized tetramer model was created using a homology model of a BAM2 monomer and the configuration of a crystallized sweet potato BAM5. This model was supported by mutations, made by other members of the lab, in specific interfaces, which disrupted tetramerization and activity. This model along with sequence alignments of BAM2 orthologs revealed a potential acidic domain, containing 2-fold more acidic residues than the catalytic domain and 10-fold more acidic residues than the chloroplast transit peptide. This acidic domain is adjacent to the N-terminal end of the catalytic domain and is just upstream from a short peptide of conserved residues (ERDF). Further, the acidic domain and ERDF peptide are located very close to the starch-binding groove, which is an area of the enzyme where two secondary binding sites face each other. Hypothesizing that this acidic domain and ERDF peptide could interact with KCl and the starch binding groove, we created two mutant BAM2 proteins—one lacking just the acidic domain (B2-NDel1), and one lacking both the acidic domain and the ERDF peptide (B2-NDel2). We hypothesized that by removing the acidic domain and the ERDF peptide, the enzyme would not require salt to function. When the activity of these enzymes were compared to the activity of wild-type BAM2, we found that neither of the mutants required salt to function, while BAM2 had negligible activity without KCl. Additionally, both of these mutants still functioned as a tetramer, even though the activity of B2-NDel2 was about 5-fold lower than NDel1. Together, these data indicate that the acidic domain and ERDF peptide might be of importance to the salt dependency of BAM2

Political Third Parties\u27 Representation In the Big Three : 24-Hour Cable News Networks\u27 Ideological Construction Of The American Political Duopoly

This thesis conducts content and functional analyses to investigate the amount and functions of third-party mentions in 24-hour cable news networks. Additionally, this thesis applies framing tactics, ideographs, and other rhetorical theory to examine strategies utilized to ideologically construct cognitions regarding the current American political duopoly

Kathinkas Gesang als Luzifers Requiem — réflexions d’une interprète

L’auteure de cet article relate son expérience d’interprétation d’une oeuvre mixte de Stockhausen, soit Kathinkas Gesang als Luzifers Requiem (1983). Une présentation sommaire de l’oeuvre y est effectuée. L’auteure y traite ensuite des problèmes rencontrés au fil de son processus d’apprentissage et des exigences particulières liées à la mixité de l’oeuvre. Elle expose la méthode de travail qu’elle a développée au contact du compositeur et de ses principaux interprètes et elle traite de la question de la cohérence timbrale entre l’instrumental et l’électronique.The author recounts her experiences performing Karlheinz Stockhausen’s Kathinkas Gesang als Luzifers Requiem (1983), for flute and electronics. After a general presentation of the work, the author describes the problems she encountered in the process of learning the piece. These problems stemmed from the particular demands made on the performer by the mixed (instrument and electronics) nature of the piece. She presents the working method she developed when in contact with Stockhausen and experienced performers of his works, and deals with the question of uniformity of timbre between instrumental and electronic sounds

Alien Registration- Breault, Roland E. (Auburn, Androscoggin County)

https://digitalmaine.com/alien_docs/30960/thumbnail.jp