Publications

adaptation by hot spring phototrophs to reduced light intensities.	photosynthesis was measured by the 14c method on natural as well as low light adapted populations of chloroflexus (a photosynthetic bacterium) and synechococcus (a blue-green alga) from hot springs in yellowstone national park (wyoming u.s.a.), to test the ability of these phototrophs to photosynthesize at a variety of light intensities. the herbicide 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (dcmu) was used to distinguish uptake of the blue-green alga from that of the photosynthetic bacterium, w ...	1977	407880
lipid biomarkers for bacterial ecosystems: studies of cultured organisms, hydrothermal environments and ancient sediments.	this paper forms part of our long-term goal of using molecular structure and carbon isotopic signals preserved as hydrocarbons in ancient sediments to improve understanding of the early evolution of earth's surface environment. we are particularly concerned with biomarkers which are informative about aerobiosis. here, we combine bacterial biochemistry with the organic geochemistry of contemporary and ancient hydrothermal ecosystems to construct models for the nature, behaviour and preservation p ...	1996	9243016
distribution of cultivated and uncultivated cyanobacteria and chloroflexus-like bacteria in hot spring microbial mats.	oligodeoxynucleotide hybridization probes were developed to complement specific regions of the small subunit (ssu) rrna sequences of cultivated and uncultivated cyanobacteria and chloroflexus-like bacteria, which inhabit hot spring microbial mats. the probes were used to investigate the natural distribution of ssu rrnas from these species in mats of yellowstone hot springs of different temperatures and phs as well as changes in ssu rrna distribution resulting from 1-week in situ shifts in temper ...	1994	11536630
complex polar lipids of a hot spring cyanobacterial mat and its cultivated inhabitants.	the complex polar lipids of the hot spring cyanobacterial mat in the 50 to 55 degrees c region of octopus spring, yellowstone national park, and of thermophilic bacteria cultivated from this or similar habitats, were compared in an attempt to understand the microbial sources of the major lipid biomarkers in this community. intact complex lipids were analyzed directly by fast atom bombardment mass spectrometry (fab-ms), two-dimensional thin-layer chromatography (tlc), and combined tlc-fab-ms. fab ...	1994	11536647
microbial diversity in natural environments: focusing on fundamental questions.	interactions with gijs kuenen and other dutch scientists have led my lab to fundamental insights into the composition, structure and function of a hot spring cyanobacterial mat community that should influence our thinking about all microbial communities. by focusing on the distribution of molecular sequence variants of predominant mat phototrophs, we have discovered that small-scale sequence variation can be ecologically meaningful. by applying novel cultivation approaches, we have been able to ...	2006	17063383
in silico approaches to study mass and energy flows in microbial consortia: a syntrophic case study.	three methods were developed for the application of stoichiometry-based network analysis approaches including elementary mode analysis to the study of mass and energy flows in microbial communities. each has distinct advantages and disadvantages suitable for analyzing systems with different degrees of complexity and a priori knowledge. these approaches were tested and compared using data from the thermophilic, phototrophic mat communities from octopus and mushroom springs in yellowstone national ...	2009	20003240