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Statistics in the Laboratory: Confidence Interval of the Mean
Wednesday, June 19, 2019
Stanley N. Deming
Estimated means are often used for making quantitative decisions (e.g., to decide if something meets specifications).
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Rapid and Automatable Desalting of Proteins and Protein Complexes by Size Exclusion Chromatography for On-Line Detection by Native Mass Spectrometry
Friday, June 14, 2019
Online buffer exchange is an effective screening tool that bridges the gap between protein expression and time-consuming structural biology methods.
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Statistics in the Laboratory: Standard Deviation of the Mean
Friday, February 22, 2019
Stanley N. Deming
In the last column we discussed the use of pooling to get a better estimate of the standard deviation of the measurement method, essentially the standard deviation of the raw data.
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Statistics in the Laboratory: Scedasticity
Friday, August 24, 2018
Stanley N. Deming
Homoscedastic and heteroscedastic—if nothing else, these are two good adjectives for word games.
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Statistics in the Laboratory: Significant Digits and the Granularity of Data
Tuesday, June 05, 2018
Stanley N. Deming
A true story: one of my former graduate students called me and said, in effect, “Help. I know I’m a good analytical chemist, but my company is making me look like a perfect analytical chemist.”
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Introduction of NIST 17—A Major Update of Mass Spectral Libraries and Software—at the 65th ASMS Conference on Mass Spectrometry and Allied Topics
Friday, August 04, 2017
O. David Sparkman
At the 65th American Society for Mass Spectrometry Conference on Mass Spectrometry and Allied Topics, held June 4–8, 2017, in Indianapolis, IN, the National Institute of Standards and Technology’s (...
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Statistics in the Laboratory: The Apparent Capability of an Industrial Process
Monday, January 16, 2017
Stanley N. Deming
It’s important to realize that information gets filtered and distorted by the inherent behavior of a measurement process.
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Statistics in the Laboratory: Control Charts, Part 3
Thursday, May 26, 2016
Stanley N. Deming
In the previous two columns (January/February and April 2016), we looked at the basic ideas behind control charts, saw how to construct the common X-bar and R charts and discovered that only two ...
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Measuring Organic Carbon: A Brief History and Discussion of Methodologies
Monday, May 02, 2016
William Lipps
Total organic carbon (TOC) is a rapid method that analyzes for organic carbon and expresses the result as the amount of carbon found.
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Statistics in the Laboratory: Control Charts, Part 2
Wednesday, April 06, 2016
Stanley N. Deming
In the previous column (January/February 2016), we looked at the basic ideas behind control charts and saw how to construct a common X-bar and R chart.
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Truly Rapid, Sensitive Analysis of Hundreds of Components by Modern GC/MS Analyzers
Tuesday, May 26, 2015
William Lipps
Gas chromatography/mass spectrometry has made it possible to run large numbers of components in a single sample injection. The GC/MS methods introduced in the late 1960s and early 1970s for ...
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Detection of Malathion Using Acetylcholinesterase-Immobilized Sol-Gel Film
Monday, January 05, 2015
Dan Xiao
Martin M.F. Choi
Jie He
Hongyan Yuan
Runguo Lin
For the past two decades, enzyme electrode development and applications have received a great deal of attention. The conventional enzyme immobilization method depends on the preparation of an enzyme...
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GC Columns Travel to Space for Comet Rendezvous
Wednesday, November 12, 2014
Norbert Reuter
Gary Lee
Gas chromatography (GC) is a powerful analytical tool, and it’s getting out of the lab and traveling millions of miles into space as part of the Rosetta mission, a project initiated by the European ...
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Statistical Outliers in the Laboratory Setting
Monday, March 03, 2014
Steven Walfish
Statistical outlier identification and remediation is a topic that has caused issues in almost every laboratory. There are many causes of outliers, including measurement error, sampling error, ...
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Specifying a Water Purification System for the Laboratory
Thursday, November 07, 2013
Steve Mines
The selection, operation, and maintenance of a reverse osmosis (RO) water purification system should be straightforward. However, systems are often 1) inaccurately specified, i.e., not matched to the...
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The Story of MALS
Saturday, October 05, 2013
Philip J. Wyatt
The concept of measuring light scattered from a solution at each of a plurality of angles simultaneously began in late 1976 in a very unlikely application. At that time, scientists from Science ...
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Crossing the Chasm of Death for Biomarkers
Tuesday, August 06, 2013
Robert L. Stevenson, Ph.D.
Biomarkers, or biological markers, have intuitive appeal, since chemists and biochemists are trained to relate activity to molecular structure and metabolism. I attend over 20 scientific meetings per ...
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