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Prof. Josh Elias (left) of Stanford University receives a thank-you gift from David Chiang after his talk.

Ever wondered about target-decoy searching? Want to gain a better understanding and realistic expectation of this effective tool? SageNResearch’s video “Addressing Peptide Identification Signal-to-noise With Target-Decoy Searching”, given by Professor Josh Elias of Stanford University at our “Translational Proteomics 2.0″ meeting, can help. Dr. Elias is an Assistant Professor in Chemical and Systems Biology at Stanford University, and was part of the Steven Gygi Lab at Harvard Medical School before that. His lab is keenly interested in developing and applying methods to meet the current challenges facing scientists engaged in large scale proteome characterization.

Josh kicked off his talk with a stunning and very powerful visual to hit home the concept of what target-decoy database searching can do — you’ll never look at coffee beans in quite the same way. With this talk, you’ll know how to better find a happy medium for thresholds, smarter ways of designing your filtering criteria, when not to even consider using the method, how to get the most out of (really easy) decoy searching in SORCERER, and what’s so good about partial tryptic searches.

The 30-minute presentation is available at: http://www.scivee.tv/node/15544
To view slides, I recommend using the “full screen” mode. The slide set can also be downloaded as a Powerpoint file.


Prof. Alexey Nesvizhskii (left) of University of Michigan receives a thank-you gift from David Chiang after his talk.

If you really want to understand how peptide and protein identification is done, this video talk is a must-see!

Professor Alexey Nesvizhskii of the University of Michigan is one of the co-inventors (with Dr. Andy Keller) of the popular PeptideProphet/ProteinProphet algorithm for turning search engine results into statistically consistent peptide and protein identifications. (This algorithm is also the basis for the popular Scaffold software.)

At the “Translational Proteomics 2.0″ meeting, we were privileged to have Alexey give his insightful talk that reviews the various steps involved in inferring peptide and protein identifications from large spectra datasets.

In this talk, you will learn why False Discovery Rates are preferred over P-values, why you probably should not run more than 4 replicates of a MudPIT experiment, how FDR estimations from decoy differ from Peptide/ProteinProphet, how “The Two Prophets” compute probabilities by curve-fitting the score distributions, how sensitivity and FDR are computed, and the what and why of some advanced TPP options.

The talk is available at: http://www.scivee.tv/node/12671 (45 minutes).

I recommend using the “full screen” mode so you can view the slides, which are also available as a download from the site. (Please be aware that the slideset order is different from that in the presentation.)

(Note: Both Trans-Proteomic Pipeline and Scaffold Batch software are integrated into the SORCERER platforms.)

Dr. John Yates from the Scripps Research Institute gave the talk “Driving Biological Discovery using Quantitative Mass Spectrometry” at the 2008 Proteomics 2.0 Meeting hosted by Sage-N Research.

 

The audio MP3 file is available by download here (click to play, right click to download):

   SageN002_JYates_2008Jun_57m.mp3

The complete slideset is available by download in 5 parts here (click to view, right click to download):

  SageN002_JYates_2008Jun_part1.pdf

   SageN002_JYates_2008Jun_part2.pdf

   SageN002_JYates_2008Jun_part3.pdf

   SageN002_JYates_2008Jun_part4.pdf

   SageN002_JYates_2008Jun_part5.pdf

The meeting was held on June 1, 2008 in Denver, just before the ASMS conference.