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Start Over Topic astrophysics::earth and planetary astrophysics
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1. Carbon dioxide snow cleaning of paper

Author

Jakub Ondráček, Lucie Ondráčková, Jiří Smolík, Petra Vávrová, Tereza Křížová, Jitka Neoralová, Magda Součková, Věra Jandová, Kateřina Kocová, Dana Novotná, Petr Stanovský, and Ludmila Mašková

Subjects
Dry cleaning, Paper, Archeology, Fine Arts, Co-axial nozzle, Materials Science (miscellaneous), chemistry.chemical_element, Conservation, Carbon Dioxide Snow, Condensed Matter::Superconductivity, Spectroscopy, Physics::Atmospheric and Oceanic Physics, Jet (fluid), QD71-142, Metallurgy, Snow, Nitrogen, Computer Science Applications, chemistry, Chemistry (miscellaneous), Dry ice, Degradation (geology), Environmental science, Astrophysics::Earth and Planetary Astrophysics, CO2 snow jet, Analytical chemistry
Abstract

The cleaning of particles from smooth and rough paper surfaces using a high-speed CO2 snow jet was investigated. The measurements included characterization of the jet properties, determination of the cleaning efficiency, and evaluation of any possible adverse effects. The method was compared with nitrogen jet cleaning and dry cleaning by commercial materials. The results showed that the CO2 snow jet is able to effectively remove particles from the paper surface and did not cause any observable degradation. The CO2 snow jet cleaning compared with the mechanical dry cleaning showed similar effectiveness without any adverse effects on the paper surface. It was proved that the CO2 snow technique is a suitable method for cleaning common types of paper materials.

Published
2021

2. Paper strip method for assaying gradient fractions containing radioactive macromolecules

Author

W.L. Carrier and R.B. Setlow

Subjects
Paper, Carbon Isotopes, Chromatography, Resolution (mass spectrometry), Mathematics::Complex Variables, Physics::Instrumentation and Detectors, Chemistry, Substitution (logic), Polynucleotides, Biophysics, Analytical chemistry, Cell Biology, Cytosine Nucleotides, Tritium, Biochemistry, DNA, Viral, Centrifugation, Density Gradient, Methods, Astrophysics::Earth and Planetary Astrophysics, Radiometry, Molecular Biology, Astrophysics::Galaxy Astrophysics, Macromolecule
Abstract

The collection of fractions from gradients is simplified by the substitution of a paper strip marked off into sections for the usual paper disc technique. There is no loss of resolution in using the strip instead of discs.

Published
1971