Job Post: Senior Chemist – Healthy Home at Bissell Corporation

The Senior Chemist – Healthy Home is responsible for development of next-generation technologies for the creation and management of a healthy home environment and microbiome, leveraging BISSELL’s unique position as a developer of both cleaning devices and chemical/natural based formulations. They assist in building department and product strategies, as well as being a liaison to …

We can model microbial growth in carpet dust after short bursts of elevated moisture

We are pleased to announce the publication of our manuscript titled “Modeling microbial growth in carpet dust exposed to diurnal variations in relative humidity using the “Time-of-Wetness” framework”  in the journal Indoor Air. This work is a culmination of research investigating how changes in relative humidity impact microbial growth in carpet dust. Our related study …

#COVID19 Journal Club: “Aerodynamic analysis of SARS-CoV-2 in two Wuhan hospitals”

This paper in Nature is the first study to report size distributions of SARS-CoV-2 in air. Although the virus itself is 0.1 microns in diameter, we expect it to be released into air in droplets that span a wide range of sizes. The droplets will shrink to less than half their original diameter as some …

#COVID19 Preprint Journal Club “Evidence for probable aerosol transmission of SARS-CoV-2 in a poorly ventilated restaurant”

(h/t to Linsey Marr for posting about this on Twitter) Sometimes I have to double check to make sure I don’t post about the same article twice.   I posted recently about an article describing transmission in a restaurant in Guangzhou, China.  This new article, “Evidence for probable aerosol transmission of SARS-CoV-2 in a poorly ventilated …

The #microbenet and BioBE Center stab at a review of COVID-19 and the Built Environment

(updated 4/7/20 with revised preprint and publication information) So late last week, the folks at the BioBE Center at the University of Oregon contacted us wanting to write a review of built environment considerations related to the 2019 Novel Coronavirus (COVID-19) outbreak.  We worked furiously on it for a couple of days and through the …

Report on 2020 Spacecraft-Associated Genome Analysis (SAGAn) workshop at NASA JPL

So this last week, we ran a workshop on bacterial genomics at the Jet Propulsion Laboratory (JPL).  Who is “we”?  An amazing collaboration across several institutions.  The whole thing was initiated by Dr. Parag Vaishampayan (NASA-JPL), who contacted myself (UC Davis), Dr. Elinne Becket (Cal State San Marcos), and Dr. Kenisha Johnson (Alabama A&M) about …

Staying alive in the built environment

Skin-associated bacteria are abundant indoors. A comparison across studies shows that up to 30% of bacterial sequences detected indoors are associated with the human body (see Table 1 in this 2016 paper). I’ve been kind of skeptical that these sequences represented live organisms, however. Rather, I suspected the high proportion of sequences that were human-associated …

Space Station conditions are selective but do not alter microbial characteristics relevant to human health

Human space exploration beyond Earth and Moon is a declared goal of NASA, ESA, Roscosmos and other space-faring agencies, with human Mars mission envisioned in the near future. One of the major challenges of the mission is protecting the human crew from illness and infection caused by harmful biological contaminants. To evaluate these challenges in …

The report from Kaunas: ISES-ISIAQ 2019

Last week, the International Societies of Exposure Science and Indoor Air Quality had their joint meeting in Kaunas, Lithuania. The meeting featured a lot of great research on topics ranging from the thermal comfort of clothes to exposure to heavy metals from e-cigarettes and everything in between. While we can’t summarize the whole meeting here, …