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 in Fall 2018, 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
The "All Species Living Tree" version 132 released
The new version of the "All Species Living Tree" based on SILVA release 132 has been released.
The 12th de.NBI Quaterly Newsletter published
Main topics: de.NBI image film at https://youtu.be/bV5f-Nrj58M - Launch of usegalaxy.eu - Training by associated partners in Kiel - de.NBI @ conferences
SILVA ACT Tool released
The new SILVA ACT service combines alignment, search and classify as well as reconstruction of trees in a single web application.
Change of SILVA Terms of Use/License Model
With the next full database release which is expected for Fall 2018, the SILVA project will resign its current dual licensing model and the SILVA data sets will become free also for commercial/non-academic users.
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 |