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Posted by John Cottrell (June 17, 2020)

Using the Quantitation Summary to create reports and charts

An earlier article described how to create a Quantitation Summary in Mascot Daemon. This is a spreadsheet-like text file, where the rows correspond to proteins and the columns contain expression data for various samples in the form of abundances or ratios of abundances. A Quantitation Summary can be opened and manipulated in a spreadsheet program such as Excel, and it [...]

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Posted by John Cottrell (May 19, 2020)

Tabulate expression data from multiple analyses with Mascot Daemon

Studies that use mass spectrometry-based quantitation often contain large numbers of individual analyses: samples from different sources or treatments or time points, possibly fractionated, with replicates and so forth. Using statistical methods to combine the analyses, extract meaningful information, and report it as charts and tables is a complex task that usually requires custom scripting in a language such as [...]

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Posted by Ville Koskinen (March 20, 2020)

How to set up remote working

There are times when you unexpectedly find yourself having to work from home. Fear not: data analysis doesn’t need to stop when you’re away from the lab. Mascot Server has a client-server architecture, and the client PC can be located anywhere. Distiller and Daemon can also be used remotely, or they can be run on a remote client PC and [...]

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Posted by Richard Jacob (November 18, 2019)

Disaster recovery

There are a number of potential issues that can cause your Mascot Server or other computer infrastructure to stop working. In the worst case, you may need to do a full recovery from backups. This can be an involved procedure, but it is straightforward as long as you have backed up key configuration and data files. For disk or storage [...]

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Posted by Richard Jacob (March 15, 2019)

Back to basics 4: Mascot Daemon

Mascot Daemon is a client to Mascot Server that can automate the processing of raw data to peak lists and submit multiple searches to a central Mascot Server. It is included with the Mascot Server licence and can be installed on as many computers in the lab as you like. Processing raw data files will use CPU resources, so you [...]

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Posted by Richard Jacob (November 16, 2017)

Using a shared TaskDB with Mascot Daemon

Mascot Daemon is our automation client for Mascot Server. The client was introduced with Mascot Server version 1.6 and has been continually developed ever since. The licensing for Mascot Daemon allows as many copies of Daemon to be installed in your lab as you like. By default, each copy of Daemon uses its own task database, TaskDB, to store information [...]

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Posted by John Cottrell (February 14, 2015)

Searching DIA data, especially Swath

DIA-Umpire is a new, open source Java program that enables untargeted peptide and protein identification and quantitation using DIA data. A detailed description can be found in Nature Methods. The DIA-Umpire signal extraction module deconvolutes the DIA data to create a conventional DDA-type peak list, suitable for database searching. The software is intended to be applicable to DIA from any [...]

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Posted by John Cottrell (February 1, 2013)

Don’t get stuck in a queue

Mascot Server doesn’t queue searches. This isn’t because we can’t be bothered to write the code. Its because we don’t believe queuing would improve performance or usability. The times taken for individual searches cover a very wide range. A PMF or a small MS/MS search with few variable modifications and tryptic specificity might take seconds. A large MS/MS search of [...]

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