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Sunday, October 4, 2020 | History

3 edition of Twin Knudsen cell configuration for activity measurements by mass spectrometry found in the catalog.

Twin Knudsen cell configuration for activity measurements by mass spectrometry

Twin Knudsen cell configuration for activity measurements by mass spectrometry

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  • 20 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Knudsen gages.,
  • Mass spectroscopy.,
  • Alloys.

  • Edition Notes

    StatementN.S. Jacobson.
    SeriesNASA-TM -- 111684, NASA technical memorandum -- 111684..
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17124823M

      The LTQ Orbitrap Elite was operated in data-dependent mode for the mass spectrometry methods. The mass spectrometry survey scan (MS1) was performed in the Orbitrap in the range of –1, m/z at a resolution of 6 × 10 4, followed by the selection of up to 20 most intense ions (TOP20) for HCD-MS2 fragmentation in the Orbitrap using the Cited by: metabolites. Herein, we review the recent advances in mass spectrometry based single-cell metabolomics, highlighting the current state-of-the-art within the last three years, and identify the challenges to move the field forward. Introduction Metabolomics is a field of study that aims to measure a large amount of metabolites at one by:

    Mean-Centering. Mean-centering is often carried out to center the data distribution at the origin in the multidimensional space. In a typical data matrix used for multivariate statistical analysis, each row represents a different sample while the metabolite identities, m/z, or peak variables are aligned into specific -centering is performed by subtracting the mean value of Cited by: Abstract. In this work, ion currents of gaseous species from synthetic slag mixtures mimicking those from coal-petcoke feedstock were measured by double Knudsen cell mass spectrometry at a temperature range of °C to °C and an oxygen partial pressure of approximately atm. The majority of gaseous vanadium was found to be present in the form of V 2 O 3, whose vapor pressure Author: Jinichiro Nakano, Jinichiro Nakano, Takashi Nagai, James Bennett, Anna Nakano, Kazuki Morita.

      Why is it important to tune your analytes in house on your mass spectrometer? Danielle Moore, Field Applications Scientist, walks you through the process of tuning your analytes on a . Mass Spectrometry Pipeline. A protein population is pre-pared from a biological source such as a cell culture. The pro-teins are rst separated from a mixed sample by means of an SDS gel. They are then digested by a proteolytic enzyme such as trypsin. The resulting peptides are loaded onto an HPLC column coupled to a mass Size: 1MB.


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Twin Knudsen cell configuration for activity measurements by mass spectrometry Download PDF EPUB FB2

A twin Knudsen cell apparatus for alloy activity measurements by mass spectrometry is described. Two Knudsen cells - one containing an alloy and one containing a pure component - are mounted on a single flange and translated into the sampling region via a motorized x-y table.

Mixing of the molecular beams from the cells is minimized by a novel system of shutters. A twin Knudsen cell apparatus for alloy activity measurements by mass spectrometry is described, Two Knudsen cells--one contain- ing an alloy and one containing a pure component--are mounted onCited by: 1.

Get this from a library. Twin Knudsen cell configuration for activity measurements by mass spectrometry. [Nathan S Jacobson; United States.

National Aeronautics and Space Administration.]. A twin Knudsen cell apparatus for alloy activity measurements by mass spectrometry is described. Two Knudsen cells - one containing an alloy and one containing a pure component - are mounted on a single flange and translated into the sampling region via a motorized x-y table.

Mixing of the molecular beams from the cells is minimized by a novel system of by: 1. A twin Knudsen cell apparatus for alloy activity measurements by mass spectrometry is described. Two Knudsen cells - one containing an alloy and one containing a pure component - are mounted on a single flange and translated into the sampling region via a motorized x-y table.

Mixing of the molecular beams from the cells is minimized by a novel system of : N. Jacobson. Additional modifications to the twin-chamber Knudsen effusion cell source mass spectrometer with a precision positioning device reported earlier are described.

With this apparatus, the activities of palladium in a few palladium-niobium alloys are by: 1. Ion currents can be measured by measuring the voltage drop across a precision resistor or ions may be counted directly. The ion count- ing technique is preferred, again, due to its lack of mass discrimination and easy adaptation to data acquisition systems.

The output of the mass spectrometer is in ion intensity, Ii. Coupling the Knudsen effusion method with mass spectrometry has proven to be one of the most useful experimental techniques for studying the equilibrium between condensed phases and complex vapors.

The Knudsen effusion method involves placing a condensed sample in a Knudsen cell, a small ''enclosure'', that is uniformly heated and held until equilibrium is attained between the.

The vapor pressure of phosphorus in molten carbon-saturated iron with phosphorus content of mass% at K was measured by double Knudsen cell mass spectrometry. Principle of (a) the twin-cell and (b) the multiple-cell furnace coupled with a mass spectrometer.

The activities are obtained from the ratio of each ion's intensity referred to the same ion's intensity as measured on the appropriate reference sample, pure component, or : M. Heyrman, C. Chatillon. Mass Spectrometer.

Pressures (Pa) Measurement Sample Chamber Chamber Base Pressure 10−5 Atm to 10−5 Operating Pressure 10−3−10−5 10−3−10−5 Pumping Speed 70ls−1 70ls−1 Ion Filament Max Pressure 10−2 n/a SEM Max Pressure 10−3 n/a Knudsen cell The Knudsen cell was machined in-house (Fig.

3), and con. Measure on Thermodynamic Properties of Calcium Phosphates Institute of Industrial Science, The University of Tokyo T. Nagai, M. Miyake, and M. Maeda Equipment for Double Knudsen Cell Mass Spectrometry Equipment for Double Knudsen Cell Mass Spectrometry It can be assumed that the activities of tetra-calcium phosphate ((CaO) 4P 2O 5).

Double Knudsen cell mass spectrometry. Knudsen cell mass spectrometry is developed to measure vapour pressures in equilibrium with a condensed phase. In this method, vapour pressure is measured by a mass spectrometer as ion current which is proportional to the by: 3.

The chemical activities of Al and Ni in γ′-Ni3Al-containing alloys were measured using the multi-cell Knudsen effusion-cell mass spectrometry technique, over the composition range 8–32at.% Al. Mass Spectrometry Measurement of Single Suspended Cells Using a Combined Cell Manipulation System and a Single-Probe Device Shawna J.

Standke, Devon H. Colby, Ryan C. Bensen, Anthony W. Burgett,* and Zhibo Yang* Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OklahomaUnited States *S Supporting InformationCited by: 5.

Knudsen cell reactors for the study of heterogeneous reactions has been described in detail in the literature–20 Typically, the reactor consists of a chamber with an isolated sample compart-ment and a small aperture through which gas-phase reactant and product species can escape to be detected, usually by mass Size: KB.

Home; Liquid Alkali Metals; 6. Study by mass spectrometry of the thermodynamic properties of some sodium alloys. Erratum to: “Knudsen cell mass spectrometry using restricted molecular beam collimation.

Optimization of the beam from the vaporizing surface”Cited by: 4. Existing single cell mass spectrometry (SCMS) sampling platforms are largely designed to work only with immobilized cells and not the suspended cells isolated from patient samples.

Here, we present a novel method that integrates a commercially available cell manipulation system commonly used for in vitro fertilization with the Single-probe SCMS sampling by: 5.

Mass Spectrometry and Protein Analysis Bruno Domon1 and Ruedi Aebersold1,2,3 Mass spectrometry is a central analytical technique for protein research and for the study of biomolecules in general. Driven by the need to identify, characterize, and quantify proteins at everCited by:.

The STA / QMS (/5) apparatus can be used for special measurement using Knudsen cell. This equipment consists of special single alumina crucible (Knudsen cell) covered by lid with small orifice.Alloys With Knudsen Effusion Mass Spectrometry Evan H.

Copland ATI Allvac Monroe, North Carolina Nathan S. Jacobson National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio Summary This report reviews Knudsen effusion mass spectrometry (KEMS) as relates to thermodynamic measurements of it metals and alloys.Average mass of water (H 2 O): + + = Da The monoisotopic mass is the sum of the masses of the atoms in a molecule using the unbound, ground-state, rest mass of the principal (most abundant) isotope for each element instead of the isotopic average mass.

Monoisotopic mass is typically expressed in unified atomic.