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News Release on Comet Research: August-2018

August 30, 2018August 31, 2018 by Editor NetKumar

Citizen Scientist Spots Comet Tails Streaking Past Distant Star

Citizen somebody Thomas Jacobs was the primary to identify tell-tale signs that an estraterrestrial body was orbiting an overseas star monitored by the Johan Kepler area Observatory. faculty member Saul Rappaport (Massachusetts Institute of Technology; MIT) and his team then collaborated with Jacobs to report the invention in new analysis revealed in Monthly Notices of the Royal Astronomical Society.

The discovery marks the primary time that the presence of Associate in a Nursing object as little as an estraterrestrial body has been inferred by observant dips within the intensity of sunshine from a star. Such dips sometimes signal crossings of planets or different objects ahead of the star, that momentarily block atiny low fraction of its lightweight. [1]

VizieR Online Data Catalog: Properties of comet 49P/Arend-Rigaux, 1984-2012 (Eisner+, 2017)

Useful pictures of extraterrestrial object 49P/Arend-Rigaux were obtained on a complete of thirty-three nights between 2012 Gregorian calendar month and will with sampling at monthly intervals (Table 1). Observations were obtained at the Lowell Observatory Hall one.1 m telescope with the e2v CCD231-84. On-chip 2×2 binning created pictures with a picture element scale of zero.740 arcseconds/pixel. On-chip 3×3 binning was used for the observations in could, manufacturing pictures with a picture element scale of one.11 arcseconds/pixel. further observations were obtained with the zero.8 m telescope, additionally at Lowell Observatory, with the e2v CCD42-40. On-chip 2×2 binning created pictures with a picture element scale of zero.456 arcseconds/pixel. [2]

Small-for-pregnancy-age rats submitted to exercise: DNA damage in mothers and newborns, measured by the comet assay

Background: craniate impairment caused by harmful intrauterine surroundings might have long consequences, akin to aerobic stress and genetic injury. Rats born as small-for-gestational-age (SPA) were submitted to exercise (swimming) before and through the physiological state. The animals exhibited aldohexose intolerance, reduced general avoirdupois, and magnified maternal and offspring organ weight, showing the advantage of exercise for these rats. we tend to hypothesize that regular exercise in SPA throughout gestation may forestall desoxyribonucleic acid injury in these animals and in their offspring, contributory to altered craniate programming of metabolism within the offspring. The severe polygenic disorder was induced by streptozotocin treatment, to get SPA newborns. [3]

Limits on the Contribution of Endogenic Radiolysis to the Presence of Molecular Oxygen in Comet 67P/Churyumov–Gerasimenko

Radiolytic production has been planned as a possible supply for the molecular atomic number 8 discovered in extraterrestrial object 67P/Churyumov–Gerasimenko. lysis is exogenous or endogenic, the latter thanks to radionuclides gift within the dirt essential of the extraterrestrial object nucleus. we tend to investigate the likelihood of forming a major quantity of molecular atomic number 8 through endogenic lysis. we tend to applied a model of radiolytic production, developed for Associate in Nursing Earth rock–water mixture, and improved it to account for the impact of the scale of a radionuclide-bearing grain on Infobahn radiation deposited in its ice mantle. we tend to calculate the potential production of molecular atomic number 8 considering the accessible experimental values of radiolytic yields. [4]

Synthesis and Investigation of Mutagenic and Genotoxic Effects of Some 2-hydroxy-1,4- Naphthoquinone Derivatives by Ames and Comet Assay

n this study, agent and genotoxic effects of novel 2-hydroxy-1,4-naphthoquinone (1) derivatives, 2-phenyl-2-(2-thiophenyl)-2,3-dihydronaphtho[2,3-b]furan-4,9-dione (3) and 2-hydroxy-3-[(E and Z)-2-phenyl-2-(2-thiophenyl)ethenyl]naphthalene-1,4-dione (4) were investigated by using bacterial reverse mutation assay in Salmonella typhimurium TA98 and TA100 strains with or without metabolic activation system (S9 mix) and comet assay in haploid Saccharomyces cerevisiae BY4741 (MATa his3Δ1 leu2Δ0 met15Δ0 ura3Δ0), severally. Derivatives, three and four were dissolved in dimethyl sulfoxide (DMSO) for all check systems. 5 non-cytotoxic concentrations of the derivatives were checked in 2 parallel freelance experiments in the Ames test. Ames check failed to show mutagenicity of check compounds. [5]

Reference

[1] Citizen Scientist Spots Comet Tails Streaking Past Distant Star

October 26, 2017(web link)

[2] VizieR Online Data Catalog: Properties of comet 49P/Arend-Rigaux, 1984-2012 (Eisner+, 2017)

Eisner N, Knight MM, Schleicher DG. VizieR Online Data Catalog: Properties of comet 49P/Arend-Rigaux, 1984-2012 (Eisner+, 2017). VizieR Online Data Catalog. 2018 Jul;515. (web link)

[3] Small-for-pregnancy-age rats submitted to exercise: DNA damage in mothers and newborns, measured by the comet assay

Netto AO, Gelaleti RB, Corvino SB, Serrano RG, Hernández SC, Volpato GT, Rudge MV, Braz MG, Damasceno DC. Small-for-pregnancy-age rats submitted to exercise: DNA damage in mothers and newborns, measured by the comet assay. Mutation Research/Genetic Toxicology and Environmental Mutagenesis. 2018 Aug 18.(web link)

[4] Limits on the Contribution of Endogenic Radiolysis to the Presence of Molecular Oxygen in Comet 67P/Churyumov–Gerasimenko

Netto AO, Gelaleti RB, Corvino SB, Serrano RG, Hernández SC, Volpato GT, Rudge MV, Braz MG, Damasceno DC. Small-for-pregnancy-age rats submitted to exercise: DNA damage in mothers and newborns, measured by the comet assay. Mutation Research/Genetic Toxicology and Environmental Mutagenesis. 2018 Aug 18.(web link)

[5] Synthesis and Investigation of Mutagenic and Genotoxic Effects of Some 2-hydroxy-1,4- Naphthoquinone Derivatives by Ames and Comet Assay

Recep Liman1*, Ibrahim Hakkı Ciğerci2 and Oğuzhan Alagöz3

1Department of Molecular Biology and Genetics, Faculty of Arts and Science, Usak University, 64300-Uşak, Turkey.

2Department of Molecular Biology and Genetics, Faculty of Arts and Science, Afyon Kocatepe University, 03200-Afyonkarahisar, Turkey.

3Department of Chemical Engineering, Faculty of Engineering, Afyon Kocatepe University, 03200-Afyonkarahisar, Turkey.

(web link)

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