The use of a transportable mass spectrometer for the direct measurement of industrial solvents in breath

1981 ◽  
Vol 8 (12) ◽  
pp. 606-610 ◽  
Author(s):  
H. K. Wilson ◽  
T. W. Ottley
Keyword(s):  
Direct Measurement ◽  
Mass Spectrometer ◽  
Industrial Solvents

A MASS SPECTROMETER AND THE MEASUREMENT OF ISOTOPE EXCHANGE FACTORS

1945 ◽  
Vol 23b (1) ◽  
pp. 40-47 ◽  
Author(s):  
H. G. Thode ◽  
R. L. Graham ◽  
J. A. Ziegler
Keyword(s):  
Direct Measurement ◽  
Mass Spectrometer ◽  
Isotope Exchange ◽  
Equilibrium Constants ◽  
Packed Columns ◽  
Radius Of Curvature ◽  
Column Experiments ◽  
Sulphur Isotopes ◽  
Mass Unit ◽  
Fractionation Column

A 180 degree direction focusing mass spectrometer for isotope abundance measurements is described. In operation, the instrument has a resolution of one mass unit in 100, which is the resolution expected from the dimensions of the slits and the radius of curvature of the ion path.The precision of the instrument is sufficiently good to make possible the direct measurement of equilibrium constants for many isotopic reactions. Several reactions previously used to separate the nitrogen and the sulphur isotopes have been investigated. The equilibrium constants for the two reactions[Formula: see text]were found to be about 60% higher than those previously reported from fractionation column experiments. However, the low values previously reported can be accounted for on the basis of Cohen's theory of packed columns.

scholarly journals Direct Measurement of S-Nitrosothiols with an Orbitrap Fusion Mass Spectrometer: S-Nitrosoglutathione Reductase as a Model Protein

2018 ◽  
pp. 143-160
Author(s):  
Damian Guerra ◽  
Ian Truebridge ◽  
Stephen J. Eyles ◽  
Patrick Treffon ◽  
Elizabeth Vierling
Keyword(s):  
Direct Measurement ◽  
Mass Spectrometer ◽  
Model Protein

scholarly journals Direct measurement of the masses ofLi11andNa26−32with an on-line mass spectrometer

1975 ◽  
Vol 12 (2) ◽  
pp. 644-657 ◽  
Author(s):  
C. Thibault ◽  
R. Klapisch ◽  
C. Rigaud ◽  
A. M. Poskanzer ◽  
R. Prieels ◽  
...  
Keyword(s):  
Direct Measurement ◽  
Mass Spectrometer ◽  
Line Mass ◽  
On Line ◽  
The Masses

Rate of fall of O2 tension in a lobe of dog lung after bronchial occlusion

1959 ◽  
Vol 14 (6) ◽  
pp. 897-900 ◽  
Author(s):  
J. B. West ◽  
P. Hugh-Jones
Keyword(s):  
Blood Flow ◽  
Steady State ◽  
Pulmonary Artery ◽  
Oxygen Tension ◽  
Direct Measurement ◽  
Mass Spectrometer ◽  
Sampling Tube ◽  
Direct Measurements ◽  
Mass Spectrometer Sampling ◽  
Different Parts

The oxygen tension in a lobe of the dog's lung following occlusion of the bronchus was measured with a mass spectrometer. The bronchus was rapidly blocked by inflating a small latex balloon just proximal to the tip of the mass spectrometer sampling tube sited in the bronchus. Cannulas in the branch of the pulmonary artery allowed the blood flow to the lobe to be continuously monitored on a rotameter, and direct measurements of flow were made by collection of timed samples. The rate of fall of O2 tension following occlusion was approximately linear initially, and the rate correlated well with the direct measurement of perfusion when the animal was in a steady state. Preliminary trials suggest that the method can be used to compare lobar or segmental perfusion in different parts of the lung in man at bronchoscopy. Submitted on June 10, 1959

Direct Measurement of the Listening of Hearing-Impaired Children

1970 ◽  
Vol 13 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Mary Mira
Keyword(s):  
Direct Measurement ◽  
Continuous Measurement ◽  
Hearing Impaired ◽  
Reinforcement System ◽  
School Aged Children ◽  
Conjugate Reinforcement ◽  
Impaired Children ◽  
Hearing Impaired Children

Listening, a significant dimension of the behavior of hearing-impaired children, may be measured directly by recording childrens' responses to obtain audio narrations programmed via a conjugate reinforcement system. Twelve hearing-impaired, school-aged children responded in varying ways to the opportunity to listen. Direct and continuous measurement of listening has relevance for evaluation of remediation methods and for discovery of variables potentially related to listening.

Sign in / Sign up

Export Citation Format

Share Document