About Egghead

Egghead is a blog about research by, with or related to UC Davis. Comments on posts are welcome, as are tips and suggestions for posts. General feedback may be sent to Andy Fell. This blog is created and maintained by UC Davis University Communications, and mostly edited by Andy Fell.

Grounds For Concern: Is Your Coffee Consistent?

UC Davis entomologist Christian Nansen trained some high-tech analysis on coffee beans, showing that brands were not consistent in content. Photo: Kathy Garvey

UC Davis entomologist Christian Nansen trained some high-tech analysis on coffee beans, showing that brands were not consistent in content. Photo: Kathy Garvey

By Kathy Keatley Garvey

If your particular brand of coffee doesn’t seem to taste the same from week to week or month to month, you may be  right. And it’s not you, it’s the coffee beans.

Agricultural entomologist Christian Nansen of the UC Davis Department of Entomology and Nematology and four colleagues analyzed 15 brands of roasted coffee beans, purchased at an area supermarket on two dates about six months apart, and using hyperspectral imaging technology, found “they were all over the board.”

Perovskite, Potential Solar Cell Material Unsuited for Real-World Use

By Becky Oskin

Solar cells made from perovskites have sparked great excitement in recent years because the crystalline compounds boast low production costs and high energy efficiencies. Now UC Davis scientists have found that some promising compounds — the hybrid lead halide perovskites — are chemically unstable and may be unsuited for solar cells.

“We have proven these materials are highly unlikely to function on your rooftop for years,” said Alexandra Navrotsky, interdisciplinary professor of ceramic, earth, and environmental materials chemistry at UC Davis and director of the Nanomaterials in the Environment, Agriculture, and Technology (NEAT) organized research unit.

Do Zebra stripes confuse biting flies?

Audio: Listen to this story on our podcast, Three Minute Egghead. 

 

Zebra stripes have fascinated people for millennia, and there are a number of different theories to explain why these wild horses should be so brightly marked. A handful of laboratories around the world – including one lead by UC Davis wildlife biologist Tim Caro – have been putting these theories to the test. A new paper from Caro’s group, led by Ken Britten at the UC Davis Center for Neuroscience, puts a hole in one idea: that the stripes confuse biting flies by breaking up polarized light.

Three Minute Egghead is our new podcast

We’re adding a new element to the Egghead blog this month with Three Minute Egghead, a podcast about research at UC Davis. While we figure out a few details about RSS feeds and XML, I’ll be posting these audio files to the Egghead blog, usually with an accompanying blog post.

Our first piece is about two UC Davis computer scientists who are using data from the open-source programming website GitHub to learn about coder’s work habits and in particular, how multitasking affects productivity.

Study author Bogdan Vasilescu will be presenting the study at the International Conference on Software Engineering in Austin, Texas tomorrow, May 20.

UC Davis scientists explore the microbiome

Today’s White House announcement of the National Microbiome Initiative will bring new funding and attention to better understand the billions of microbes that swarm around in and around us and probably play an important role in our health, food and environment. At UC Davis, many scientists are already exploring this hidden world. Here are a few of them.

Jonathan Eisen is one of the pioneers of studying microbe communities through genetic sequencing. His lab is involved in understanding the complete “Tree of Life,” and projects on microbial communities associated with buildings, as well as communities on different plants and animals, including people, dogs and cats. A prolific blogger, Eisen regularly calls out examples of excessive microbiome hype.

How antibiotics open door to “bad” gut bacteria: more oxygen

By Carole Gan

Antibiotics are essential for fighting bacterial infection, but they can also make the body more prone to infection and diarrhea. Exactly how do antibiotics foster growth of disease-causing microbes – and how can resident “good” microbes in the gut protect against pathogens, such as Salmonella?

Now research led by Andreas Bäumler, professor of medical immunology and microbiology at UC Davis Health System, has identified the chain of events that occur within the gut lumen of mice after antibiotic treatment that allow “bad” bugs to flourish.

Microbe studies zoom in on effects of HIV in the gut

By Pat Bailey

The curtain cloaking how AIDS and HIV (human immunodeficiency virus) impact the human digestive and immune systems has been drawn back a bit further, thanks to a team of researchers from UC Davis’ departments of Food Science and Technology and Medical Microbiology and Immunology.

The small intestine­ is extremely difficult to study because of its location in the body but plays a critical role in human health. Its inner lining offers both a portal for absorbing nutrients and a barrier against toxins or invasive microbes.

Livestock and Climate Change: Facts and Fiction

Dairy cows eat hay

Holstein cows eat lunch at the Dairy Cattle Facility at UC Davis. Credit: Gregory Urquiaga, UC Davis

By Frank Mitloehner

As the November 2015 Global Climate Change Conference COP21 concluded in Paris, 196 countries reached agreement on the reduction of fossil fuel use and emissions in the production and consumption of energy, even to the extent of potentially phasing out fossil fuels out entirely.

Both globally and in the U.S., energy production and use, as well as the transportation sectors, are the largest anthropogenic contributors of greenhouse gasses (GHG), which are believed to drive climate change. While there is scientific consensus regarding the relative importance of fossil fuel use, anti animal-agriculture advocates portray the idea that livestock is to blame for a lion’s share of the contributions to total GHG emissions.

UC Davis Physicist Will Illuminate Black Holes In Inaugural Ko Lecture

Update May 4: This event is now free of charge for all. RSVPs are requested.

By Becky Oskin

The first lecture in new Winston Ko Frontiers in Mathematical and Physical Sciences Public Lecture series will take place May 9. Veronika Hubeny will discuss modern understanding of black holes, and the remaining mysteries. Her talk, “Illuminating Black Holes,” begins at 5 p.m. on Monday, May 9, in the UC Davis Conference Center.Public lecture on black holes, May 9, UC Davis Conference Center

West Coast Scientists Recommend Immediate Action Plan to Combat Ocean Acidification

By Kat Kerlin

Global carbon dioxide emissions are triggering permanent changes to ocean chemistry along the West Coast. Failure to act on this fundamental change in seawater chemistry, known as ocean acidification, is expected to have devastating ecological consequences for the West Coast in the decades to come, warns a multistate panel of scientists, including two from UC Davis Bodega Marine Laboratory.

Their report, issued this week, urges immediate action and outlines a regional strategy to combat the alarming global changes underway. Inaction now will reduce options and impose higher costs later, the report said.