Tag Archives: eisen lab

New lab paper: The microbes we eat: abundance and taxonomy of microbes consumed in a day’s worth of meals for three diet types

A new paper out from my lab (with Jenna Lang as the 1st author and in collaboration with Angela Zivcovic from the UC Davis Food For Health Initiative and the Department of Nutrition):  The microbes we eat: abundance and taxonomy of microbes consumed in a day’s worth of meals for three diet types.  The work in the paper focuses on characterizing the abundance and taxonomy of microbes in food from three model diets.

Basically, Angela prepared meals for these three diets

Food was purchased and prepared in a standard American home kitchen by the same individual using typical kitchen cleaning practices including hand washing with non-antibacterial soap between food preparation steps, washing of dishes and cooking instruments with non-antibacterial dish washing detergent, and kitchen clean-up with a combination of anti-bacterial and non-antibacterial cleaning products. Anti-bacterial products had specific anti-bacterial molecules added to them whereas “non-antibacterial” products were simple surfactant-based formulations. The goal was to simulate a typical home kitchen rather than to artificially introduce sterile practices that would be atypical of how the average American prepares their meals at home. All meals were prepared according to specific recipes (from raw ingredient preparation such as washing and chopping, to cooking and mixing).

And then she blended them and we characterzied the microbial communities in the blended samples:

After food preparation, meals were plated on a clean plate, weighed on a digital scale (model 157W; Escali, Minneapolis, MN), and then transferred to a blender (model 5,200; Vita-Mix Corporation, Cleveland, OH) and processed until completely blended (approximately 1–3 min). Prepared, ready to eat foods that were purchased outside the home were simply weighed in their original packaging and then transferred to the blender. 4 mL aliquots of the blended meal composite were extracted from the blender, transported on dry ice and then stored at −80 °C until analysis. The following analyses were completed using these meal composite samples: (1) total aerobic bacterial plate counts, (2) total anaerobic bacterial plate counts, (3) yeast plate counts, (4) fungal plate counts, and (5) 16S rDNA analysis for microbial ecology.

And Jenna Lang coordainted the sequence analysis and then Angela and Jenna (with some help here and there from me) coordianted the analysis of the different microbial data and the writing of the paper.

Figure 5: Biplot of taxa in sample PCoA space.

Lots of interesting things reported in the paper (read it, I insist).  I note – this is a demonstration project in a way – trying to get the community and others to think about the source pools of microbes that come into our system from our food.  It is by no means comprehensive or conclusive (read the caveats section of the paper).  Congrats to Jenna and Angela for all their hard work. Anyway – the paper is Open Access in PeerJ.  Eat it up.

UPDATE: Some press and blog coverage

Post-doc w/ me, Jessica Green, Jay Stachowicz, and Jenna Lang on seagrass microbiomes

Postdoctoral Position in Microbial Ecology and Evolution
Jessica Green at the University of Oregon Green (http://pages.uoregon.edu/green/) is currently seeking a postdoctoral researcher to explore fundamental questions in microbial ecology and evolution. Applicants should have a PhD in a biological, computational, mathematical, or statistical field with extensive training using theory and/or modeling to understand the ecology and evolution of complex biological communities, and strong writing skills. Experience developing and applying quantitative phylogenetic ecological methods is highly desirable, but not explicitly required for candidates who have otherwise demonstrated strong quantitative skills.
The successful candidate will play a key role in the Seagrass Microbiome Project (http://seagrassmicrobiome.org) in collaboration among Jonathan Eisen https://phylogenomics.wordpress.com), Jay Stachowicz http://www-eve.ucdavis.edu/stachowicz/stachowicz.shtml, and Jenna Lang (http://jennomics.com/) at the University of California, Davis. The Seagrass Microbiome Project aims to integrate the long interest in seagrass ecology and ecosystem science with more recent work on microbiomes to produce a deeper, more mechanistic understanding of the ecology and evolution of seagrasses and the ecosystems on which they depend. Our studies of the community of microorganisms that live in and on seagrasses – the seagrass “microbiome” – will contribute to a broader understanding of host-microbe systems biology, and will benefit from ongoing University of Oregon research programs including the Microbial Ecology and Theory of Animals Center for Systems Biology (http://meta.uoregon.edu/) and the Biology and Built Environment Center (http://biobe.uoregon.edu/).
The position is available for 1 year with the possibility for renewal depending on performance. The start date is flexible. Please email questions regarding the position to Jessica Green (jlgreen).
To apply
A complete application will consist of the following materials:
(1) a brief cover letter explaining your background and career interests
(2) CV (including publications)
(3) names and contact information for three references
Submit materials to ie2jobs. Subject: Posting 14431
To ensure consideration, please submit applications by November 1, 2014, but the position will remain open until filled.
Women and minorities encouraged to apply. We invite applications from qualified candidates who share our commitment to diversity.
The University of Oregon is an equal opportunity, affirmative action institution committed to cultural diversity and compliance with the ADA. The University encourages all qualified individuals to apply, and does not discriminate on the basis of any protected status, including veteran and disability status.