SILVA
Welcome to the SILVA rRNA database project
A comprehensive on-line resource for quality checked and aligned ribosomal RNA sequence data.
SILVA provides comprehensive, quality checked and regularly updated datasets of aligned small (16S/18S, SSU) and large subunit (23S/28S, LSU) ribosomal RNA (rRNA) sequences for all three domains of life (Bacteria, Archaea and Eukarya).
SILVA are the official databases of the software package ARB.
For more background information 
Click here
SILVAngs
Check out our service for Next Generation Amplicon data
SILVA Alignment, Classification and Tree (ACT) Service
The SILVA ACT service combines alignment, search and classify as well as reconstruction of trees in a single web application.
SILVA ACT is available at: 
www.arb-silva.de/act
SILVA Tree Viewer
The SILVA Tree Viewer is a web application to browse and query the SILVA guide trees.
A technical preview is available at 
www.arb-silva.de/treeviewer
ARB
The software package ARB represents a graphically-oriented, fully-integrated package of cooperating software tools for handling and analysis of sequence information.
The ARB project has been started more than 15 years ago by Wolfgang Ludwig at the Technical University in Munich, Germany, see 
www.arb-home.de.
UniEuk
SILVA is a member of the UniEuk project, a community-based project to achieve a universal taxonomic framework for Eukaryotes, focused primarily on protists. UniEuk is integrating information from relevant genetic markers and classical morphology-based data, validated by a comprehensive network of taxonomy experts.
Citations
Quast C, Pruesse E, Yilmaz P, Gerken J, Schweer T, Yarza P, Peplies J, Glöckner FO (2013) The SILVA ribosomal RNA gene database project: improved data processing and web-based tools. Nucl. Acids Res. 41 (D1): D590-D596.
For the taxonomic framework:
Yilmaz P, Parfrey LW, Yarza P, Gerken J, Pruesse E, Quast C, Schweer T, Peplies J, Ludwig W, Glöckner FO (2014) The SILVA and "All-species Living Tree Project (LTP)" taxonomic frameworks. Nucl. Acids Res. 42:D643-D648
SILVA Terms of Use/License Information
SILVA follows a dual licensing model. In short, browsing the content of the SILVA webportal (including results of the data analysis services) and deploying this information is free for all users. Any downloads provided are free for ACADEMIC users. Redistribution of these downloads or their derivates requires a reference to the official SILVA license terms. NON-ACADEMIC users need to acquire a SILVA Commercial License for utilisation of any downloads provided. Change of license model for commercial users with SILVA release 138, please refer to the SILVA Terms of Use/License Information
Partners
Please visit our partners. They facilitate the SILVA database project.
SILVA RSS Feed + ARB & SILVA User Group
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to get the latest News. - Stay up to date and follow the discussions of the ARB/SILVA community by subscribing to the Yahoo ARB & SILVA User Group.
News
SILVAngs now running on the de.NBI Cloud
As partners in the German Network for Bioinformatics Infrastructure (de.NBI) project, we are proud to announce that the SILVAngs service is now running on the de.NBI scientific cloud infrastructure. A 400 CPU cluster has been set up and is providing valuable compute power for your analysis projects.
The 16th de.NBI Quaterly Newsletter published
Shortly before the summer break, we provide an addendum to the latest de.NBI Quarterly Newsletter, Issue 2/19. It presents new training activities and de.NBI-supported conferences that take place in the next three months.
The 15th de.NBI Quaterly Newsletter published
Check de.NBIs new quarterly newsletter! This time with articles about the de.NBI office and ELIXIR meeting, BierDEcorded project, Oliver Stegle our new associated partner and many more.
SILVA Release 138 further delayed
Dear SILVA community, we are very sorry, but the release of SILVA 138 will be delayed until approximately June/July 2019. The main reason is that we had to change several of our "third-party" data providers since the providers we used were not longer up-to-date. This caused the need for refactoring parts of the software pipeline, which took longer then expected. We are working with high pressure on the new release.
User satisfaction survey
SILVA is now part of the German Network for Bioinformatics Infrastructure de.NBI.
To evaluate and improve our quality of service we need your feedback. Please help us by participating in this short survey.
SILVA SSU / LSU 132 - full release
| SSU Parc | SSU Ref | SSU Ref NR 99 | LSU Parc | LSU Ref | |||
|---|---|---|---|---|---|---|---|
| Minimal length | 300 | 1200/900 | 1200/900 | 300 | 1900 | ||
| Quality filtering | basic | strong | strong | basic | strong | ||
| Guide Tree | no | no | yes | no | yes | ||
| Release date | 13.12.17 | 13.12.17 | 13.12.17 | 13.12.17 | 13.12.17 | ||
| Aligned rRNA sequences | 6,073,181 | 2,090,668 | 695,171 | 907,382 | 198,843 |