Ileana Pérez-RodríguezUniversity of Pennsylvania | UP · Department of Earth and Environmental Science
Ileana Pérez-Rodríguez
About
25
Publications
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423
Citations
Citations since 2017
Publications
Publications (25)
A novel thermophilic, anaerobic, mixotrophic bacterium, designated strain MAG-PB1T, was isolated from a shallow-water hydrothermal vent system in Paleochori Bay off the coast of Milos Island, Greece. The cells were Gram-negative, rugose short rods approximately 1.0 μm in length and 0.5 μm in width. Strain MAG-PB1T grew between 30 and 70 °C (optimum...
NO3⁻ reduction is a metabolism that is widespread among ε-Proteobacteria and Aquificae, two abundant classes of microorganisms found at deep-sea vents. In this study, we used Sulfurovum lithotrophicum, Caminibacter mediatlanticus and Thermovibrio ammonificans as representatives of these groups to study ecophysiological, metabolic and biogeochemical...
A novel mesophilic, anaerobic, mixotrophic bacterium, with designated strains EPR-M T and HR-1, was isolated from a semi-extinct hydrothermal vent at the East Pacific Rise and from an Fe-mat at Lō'ihi Seamount, respectively. The cells were Gram-negative, pleomorphic rods of about 2.0 µm in length and 0.5 µm in width. Strain EPR-M T grew between 25...
We investigated the impact of pressure on thermophilic, chemolithoautotrophic NO3− reducing bacteria of the phyla Campylobacterota and Aquificota isolated from deep‐sea hydrothermal vents. Batch incubations at 5 and 20 MPa resulted in decreased NO3− consumption, lower cell concentrations, and overall slower growth in Caminibacter mediatlanticus (Ca...
Chemosynthetic Epsilonproteobacteria from deep-sea hydrothermal vents colonize substrates exposed to steep thermal and redox gradients. In many bacteria, substrate attachment, biofilm formation, expression of virulence genes and host colonization are partly controlled via a cell density-dependent mechanism involving signal molecules, known as quoru...
We investigate the dependence of elemental abundances on physical constants, and the implications this has for the distribution of complex life for various proposed habitability criteria. We consider three main sources of abundance variation: differing supernova rates, alpha burning in massive stars, and isotopic stability, and how each affects the...
If the origin of life is rare and sensitive to the local conditions at the site of its emergence, then, using the principle of mediocrity within a multiverse framework, we may expect to find ourselves in a universe that is better than usual at creating these necessary conditions. We use this reasoning to investigate several origin of life scenarios...
We investigate the dependence of elemental abundances on physical constants, and the implications this has for the distribution of complex life for various proposed habitability criteria. We consider three main sources of abundance variation: differing supernova rates, alpha burning in massive stars, and isotopic stability, and how each affects the...
The aim of the present method is to reduce the dimensional variability of asbestos, elongated mineral particles, fibrous, and other asbestiform minerals for use in biological assays. Here, the pristine mineral sample is filtered through two nylon meshes of different sizes to obtain a narrower dimensional distribution following a power law. Furtherm...
Neutrophilic, microaerobic Fe(II)‐oxidizing bacteria (FeOB) from marine and freshwater environments are known to generate twisted ribbon‐like organo‐mineral stalks. These structures, which are extracellularly precipitated, are susceptible to chemical influences in the environment once synthesized. In this paper, we characterize the minerals associa...
In nature, asbestos is often associated with minerals and other non-asbestiform morphologies thought to be harmless, but not much is known about the potential toxic effects of these phases. Therefore, the characterization of natural assemblages should not be limited to asbestos fibers only. This paper combines a multi-analytical characterization of...
Stable isotope compositions of methane (δ¹³C and δD) and of short-chain alkanes are commonly used to trace the origin and fate of carbon in the continental crust. In continental sedimentary systems, methane is typically produced through thermogenic cracking of organic matter and/or through microbial methanogenesis. However, secondary processes such...
Geothermobacter sp. strain HR-1 was isolated from the Lō‘ihi Seamount vent system in the Pacific Ocean at a depth of 1,000 m. Reported here is its 3.84-Mb genome sequence.
Geothermobacter sp. strain EPR-M was isolated from a hydrothermal vent on the East Pacific Rise and has been shown to participate in the reduction of Fe(III) oxides. Here, we report its 3.73-Mb draft genome sequence.
We report measurements of resolved ¹²CH2D2 and ¹³CH3D at natural abundances in a variety of methane gases produced naturally and in the laboratory. The ability to resolve ¹²CH2D2 from ¹³CH3D provides unprecedented insights into the origin and evolution of CH4. The results identify conditions under which either isotopic bond order disequilibrium or...
Continuous culture under elevated pressures is an important technique for expanding the exploration of microbial growth and survival in extreme environments associated with the deep biosphere. Here, we present a benchtop, stirred, continuous culture bioreactor capable of withstanding temperatures ranging from 25 to 120 °C and pressures up to 69 MPa...
A thermophilic, anaerobic, chemolithoautotrophic bacterium, strain TB-6T, was isolated from a deep-sea hydrothermal vent located on the East Pacific Rise at 9° N. The cells were Gram-staining-negative and rod-shaped with one or more polar flagella. Cell size was approximately 1–1.5 µm in length and 0.5 µm in width. Strain TB-6T grew between 45 and...
Over the past few years the relevance of nitrate respiration in microorganisms from deep-sea hydrothermal vents has become evident. In this study, we surveyed the membrane-bound nitrate reductase (Nar) encoding gene in three different deep-sea vent microbial communities from the East Pacific Rise and the Mid-Atlantic Ridge. Additionally, we tested...
type strain HB-1 is a thermophilic (T: 75°C), strictly anaerobic, chemolithoautotrophic bacterium that was isolated from an active, high temperature deep-sea hydrothermal vent on the East Pacific Rise. This organism grows on mineral salts medium in the presence of CO/H, using NO or S as electron acceptors, which are reduced to ammonium or hydrogen...
A novel hyperthermophilic, anaerobic, chemolithoautotrophic bacterium, designated strain HB-8(T), was isolated from the tube of Alvinella pompejana tubeworms collected from the wall of an actively venting sulfide structure on the East Pacific Rise at 13° N. The cells were Gram-negative rods, approximately 1.0-1.5 µm long and 0.5 µm wide. Strain HB-...
Caminibacter mediatlanticus strain TB-2(T) [1], is a thermophilic, anaerobic, chemolithoautotrophic bacterium, isolated from the walls of an active deep-sea hydrothermal vent chimney on the Mid-Atlantic Ridge and the type strain of the species. C. mediatlanticus is a Gram-negative member of the Epsilonproteobacteria (order Nautiliales) that grows c...
A thermophilic, anaerobic, chemosynthetic bacterium, designated strain MB-1(T), was isolated from the walls of an active deep-sea hydrothermal vent chimney on the East Pacific Rise at degrees 50' N 10 degrees 17' W. The cells were Gram-negative-staining rods, approximately 1-1.5 mum long and 0.3-0.5 mum wide. Strain MB-1(T) grew at 25-65 degrees C...
A mesophilic, aerobic, facultatively chemolithoautotrophic bacterium, designated strain EPR70(T), was isolated from hydrothermal fluids from diffuse-flow vents on the East Pacific Rise at degrees 50' N 10 degrees 17' W. Cells were Gram-negative rods, approximately 0.8-1.0 microm long and 0.3-0.5 microm wide. Strain EPR70(T) grew at 20-40 degrees C...
Projects
Project (1)
Establishing a geomicrobiology research program in the Department of Earth and Environmental Science and in association to the Vagelos Institute for Energy Science and Technology at the University of Pennsylvania. Project goals include:
i) Microbial remediation of asbestos- This project provides the opportunity to interrogate microbe-mineral interactions in human-disposed minerals.
ii) Bioenergetic principles of energy metabolism- This project will focus on the ecophysiology of hydrogenotrophic methanogens and/or Fe(III) reducers from marine geothermal environments.
iii)Taxonomic classification- Isolation and characterization of novel chemosynthetic microorganisms from anoxic environments.
If interested in learning more please contact me at: ileperez@sas.upenn.edu
