Search for tag: "samples"

VEN123L Video 8.1 - Residual Sugar - Enzymatic Analysis

How do we know when we're really done with fermentation? How does enzymatic analysis work? What are the components of an enzymatic assay kit? Copyright Thi Nguyen Do not distribute without…

From  Thi Nguyen on November 14th, 2020 0 likes 10 plays 0  

VEN123L Video 7.3 - Ebulliometry and NIR Spectroscopy

What is the difference between a primary and secondary method? How do ebulliometry and near-infrared spectroscopy work? Copyright Thi Nguyen Do not distribute without permission …

From  Thi Nguyen on October 30th, 2020 0 likes 48 plays 0  

VEN123L Video 7.2 - Ethanol - GC-FID

How do gas chromatography and flame ionization detection work? What is internal standardization and what is its purpose? Copyright Thi Nguyen Do not distribute without permission …

From  Thi Nguyen on October 30th, 2020 0 likes 45 plays 0  

VEN123L Video 4.4 - Paired t-test

When would we use a paired t-test? How does it work? What are the similarities between a paired t-test and a one sample t-test for systematic error? Copyright Thi Nguyen Do not distribute without…

From  Thi Nguyen on October 15th, 2020 0 likes 61 plays 0  

VEN123L Video 6.1 - Copper - Flame Atomic Absorption Spectroscopy

How is atomic spectroscopy different from molecular spectrophotometry? What's going on inside an atomic spectrometer? How is copper analyzed by flame atomic absorption spectroscopy? Copyright…

From  Thi Nguyen on October 15th, 2020 0 likes 83 plays 0  

VEN123L Video 3.6 - Comparing Means

How can we tell whether two samples are different from one another? What about if two different methods are giving us different results? Copyright Thi Nguyen Do not distribute without permission …

From  Thi Nguyen on September 30th, 2020 0 likes 84 plays 0  

VEN123L Video 3.5 - Comparing Variances

What is variance? How can we tell whether one method is more precise than another? What are degrees of freedom in statistics? Copyright Thi Nguyen Do not distribute without permission …

From  Thi Nguyen on September 30th, 2020 0 likes 93 plays 0  

VEN123L Video 1.4 - Some Fundamentals

Why do we perform measurements? What's the difference between a population, sample, and test sample? What are replicates? Why even bother with statistics? Copyright Thi Nguyen Do not distribute…

From  Thi Nguyen on September 27th, 2020 0 likes 77 plays 0  

VEN123L Video 5.3 - Free Alpha-Amino Nitrogen - Analysis

How do we prepare juice samples for the analysis of free alpha-amino nitrogen? How do we perform dilutions? How do we deal with sample background noise during spectrophotometric analysis? How do we…

From  Thi Nguyen on September 2nd, 2020 0 likes 87 plays 0  

VEN123L Video 5.2 - Free Alpha-Amino Nitrogen - Calibration

What is calibration? How do we prepare standards for external calibration and how do we make a calibration curve? How do we give the spectrophotometer a baseline, to measure just what we're…

From  Thi Nguyen on August 31st, 2020 0 likes 90 plays 0  

VEN123L Video 5.1 - Spectrophotometry

How does a spectrophotometer work? What are the key parts of a spectrophotometer? What sort of cuvettes are available and how should they be handled? Copyright Thi Nguyen Do not distribute without…

From  Thi Nguyen on August 31st, 2020 0 likes 65 plays 0  

VEN123L Video 3.2 - Titratable Acidity: Analysis

What is titratable acidity and why do we measure it? How do we prepare a sample for titration? What's going on during a titration? Copyright Thi Nguyen Do not distribute without permission…

From  Thi Nguyen on August 31st, 2020 0 likes 71 plays 0