Devaki Bhaya wants to understand how environmental stressors, such as light, nutrients, and viral attacks are sensed by and affect photosynthetic microorganisms. She is also interested in understanding the mechanisms behind microorganism movements, and how individuals in groups communicate, evolve, share resources. To these ends, she focuses on one-celled, aquatic cyanobacteria, in the lab with model organisms and with organisms in naturally occurring communities.

 Phototaxis is the ability of organisms to move directionally in response to a light source.  Many cyanobacteria exhibit phototaxis, both towards and away from light. The ability to move into optimal light for photosynthesis is likely to be an advantage. Bhaya is  particularly interested in how cells perceive light of different wavelengths; the photoreceptors involved, and how the molecular signals are transmitted into actions.

Science knows almost nothing about how microbial worlds communicate, evolve, share resources, or interact with other organisms. Bhaya’s recent research on speciation and evolution of thermophilic cyanobacteria in the microbial mats of hot springs in Yellowstone National Park has set the stage for a move into challenging new territory. Using pioneering methods, her group compiled full genome sequences of two dominant cyanobacteria (Synechococcus sp.) and a green, non-sulfur photosynthetic bacterium Roseiflexus sp. Her work represents the first glimpse into the complexity of microbial population to reveal a complex, integrated regulatory network. For more information see, https://dpb.carnegiescience.edu/labs/bhaya-lab

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Explore Carnegie Science

Palm trees rise in front of the San Gabriel Mountains.
January 10, 2022

Washington, DC—California Governor Gavin Newsom on Monday announced $20 million in his 2023 fiscal year budget to support Carnegie’s new research facility in Pasadena. The proposed budget allocation still must clear the California State Senate and Assembly, which will begin to hold hearings in the coming weeks. It must be adopted by June 15. 

The new 135,000-square-foot, state-of-the-art campus will bring the institution’s life and environmental scientists together in a single location adjacent to Caltech—making a decisive investment in the global fight against climate change. The facility will house more than 200 new hires and relocated staff, who

Artwork created by Sue Rhee using Wombo.art.
December 9, 2021

Palo Alto, CA—Green is a color that is almost universally associated with plants—for good reason. The green pigment chlorophyll is essential to plants’ ability to generate food; but what happens if they don’t have enough of it?

New work from Carnegie, Michigan State University, and the National Research Institute for Agriculture, Food and Environment in France reveals the complex, interdependent nutrient responses underpinning a potentially deadly, low-chlorophyll state called chlorosis that’s associated with an anemic, yellow appearance. Their findings, published by Nature Communications, could usher in more environmentally friendly agricultural

Margaret McFall-Ngai
November 17, 2021

Washington, DC—Pioneering microbiome specialist Margaret McFall-Ngai has been named the inaugural director of Carnegie’s newly launched research division focused on life and environmental sciences, which will deploy an integrated, molecular-to-global approach to tackling the challenges of sustainability, resilience, and adaptation to a changing climate. McFall-Ngai will join the institution in January, 2022, from the University of Hawai‘i at Mānoa, where she is a professor at the Pacific Biosciences Research Center’s Kewalo Marine Laboratory and the center’s director emerita.

“Margaret’s exemplary research and groundbreaking vision are the

Rose rust on plant leaves. Image purchased from Shutterstock.
October 26, 2021

Palo Alto, CA—New work led by Carnegie’s Kangmei Zhao and Sue Rhee reveals a new mechanism by which plants are able to rapidly activate defenses against bacterial infections. This understanding could inspire efforts to improve crop yields and combat global hunger.

“Understanding how plants respond to stressful environments is critical for developing strategies to protect important food and biofuel crops from a changing climate,” Rhee explained. 

Published in eLife, new work from Zhao and Rhee, along with Carnegie’s Benjamin Jin and Stanford University’s Deze Kong and Christina Smolke, investigated how production of a plant defense

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Revolutionary progress in understanding plant biology is being driven through advances in DNA sequencing technology. Carnegie plant scientists have played a key role in the sequencing and genome annotation efforts of the model plant Arabidopsis thaliana and the soil alga Chlamydomonas reinhardtii. Now that many genomes from algae to mosses and trees are publicly available, this information can be mined using bioinformatics to build models to understand gene function and ultimately for designing plants for a wide spectrum of applications.

 Carnegie researchers have pioneered a genome-wide gene association network Aranet that can assign functions

Ana Bonaca is Staff Member at Carnegie Observatories. Her specialty is stellar dynamics and her research aims to uncover the structure and evolution of our galaxy, the Milky Way, especially the dark matter halo that surrounds it. In her research, she uses space- and ground-based telescopes to measure the motions of stars, and constructs numerical experiments to discover how dark matter affected them.

She arrived in September 2021 from Harvard University where she held a prestigious Institute for Theory and Computation Fellowship. 

Bonaca studies how the uneven pull of our galaxy’s gravity affects objects called globular clusters—spheres made up of a million

Peter Gao's research interests include planetary atmospheres; exoplanet characterization; planet formation and evolution; atmosphere-surface-interior interactions; astrobiology; habitability; biosignatures; numerical modeling.

His arrival in September 2021 continued Carnegie's longstanding tradition excellence in exoplanet discovery and research, which is crucial as the field prepares for an onslaught of new data about exoplanetary atmospheres when the next generation of telescopes come online.

Gao has been a part of several exploratory teams that investigated sulfuric acid clouds on Venus, methane on Mars, and the atmospheric hazes of Pluto. He also

Anne Pommier's research is dedicated to understanding how terrestrial planets work, especially the role of silicate and metallic melts in planetary interiors, from the scale of volcanic magma reservoirs to core-scale and planetary-scale processes.

She joined Carnegie in July 2021 from U.C. San Diego’s Scripps Institution of Oceanography, where she investigated the evolution and structure of planetary interiors, including our own Earth and its Moon, as well as Mars, Mercury, and the moon Ganymede.

Pommier’s experimental petrology and mineral physics work are an excellent addition to Carnegie’s longstanding leadership in lab-based mimicry of the

Johanna Teske became the first new staff member to join Carnegie’s newly named Earth and Planets Laboratory (EPL) in Washington, D.C., on September 1, 2020. She has been a NASA Hubble Fellow at the Carnegie Observatories in Pasadena, CA, since 2018. From 2014 to 2017 she was the Carnegie Origins Postdoctoral Fellow—a joint position between Carnegie’s Department of Terrestrial Magnetism (now part of EPL) and the Carnegie Observatories.

Teske is interested in the diversity in exoplanet compositions and the origins of that diversity. She uses observations to estimate exoplanet interior and atmospheric compositions, and the chemical environments of their formation