L. Ward

Publications73
h-index20
Citations1,319
Highly Influential Citations73
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Oxygen requirements of the earliest animals
TLDR
It is shown that modern demosponges, serving as analogs for early animals, can survive under low-oxygen conditions of 0.5–4.0% present atmospheric levels, suggesting that the origin of animals may not have been triggered by a contemporaneous rise in the oxygen content of the atmosphere and oceans.
Crown group Oxyphotobacteria postdate the rise of oxygen
TLDR
Combining genomic data from the Melainabacteria and cross‐calibrated Bayesian relaxed molecular clock analyses show that crown group Oxyphotobacteria evolved ca.
Development of an Optimized Medium, Strain and High-Throughput Culturing Methods for Methylobacterium extorquens
TLDR
A new system for high-throughput batch culture of M. extorquens in microtiter plates is developed by jointly optimizing the properties of the organism, the growth media and the culturing system, and an optimized growth medium is developed using response surface methodologies.
Evolution of Phototrophy in the Chloroflexi Phylum Driven by Horizontal Gene Transfer
TLDR
Comparisons of organismal and phototrophy protein phylogenies throughout the Chloroflexi demonstrate that two new lineages acquired photot rophy independently via horizontal gene transfer (HGT) from different ancestral donors within the classically phototrophic Chlor oflexia class, illustrating a complex history of phototROphy within this group.
Timescales of Oxygenation Following the Evolution of Oxygenic Photosynthesis
TLDR
Calculations suggest that oxygenic photosynthesis arose shortly before the rise of oxygen, not hundreds of millions of years before it, because of the multiscale nature of the carbon and oxygen cycles.
Evolution of the 3-hydroxypropionate bicycle and recent transfer of anoxygenic photosynthesis into the Chloroflexi
Significance Photosynthesis supports life on our planet; however, we know very little about the origins of this metabolism. Anoxygenic photosynthesis existed prior to the evolution of its more…
Primary Productivity Was Limited by Electron Donors Prior to the Advent of Oxygenic Photosynthesis
To evaluate productivity on the early Earth before the advent of oxygenic photosynthesis, we integrated estimates of net primary production by early anaerobic metabolisms as limited by geological…
Genomic Reconstruction of an Uncultured Hydrothermal Vent Gammaproteobacterial Methanotroph (Family Methylothermaceae) Indicates Multiple Adaptations to Oxygen Limitation
TLDR
Recovered and analyzed a near-complete genome from a novel gammaproteobacterial methanotroph associated with a white smoker chimney in the Southern Lau basin showed that B42 possesses a branched respiratory chain with A- and B-family heme copper oxidases, cytochrome bd oxidase and a partial denitrification pathway, which could allow B42 to respire over a wide range of oxygen concentrations within the highly dynamic vent environment.
The evolution and productivity of carbon fixation pathways in response to changes in oxygen concentration over geological time.
  • L. Ward, P. Shih
  • Environmental Science
    Free radical biology & medicine
  • 20 August 2019
Draft Genome Sequence of Ardenticatena maritima 110S, a Thermophilic Nitrate- and Iron-Reducing Member of the Chloroflexi Class Ardenticatenia
TLDR
This thermophilic organism is capable of a range of physiologies, including aerobic respiration and iron reduction, and encodes a complete denitrification pathway with a novel nitric oxide reductase.
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