Prathap Parameswaran

Kansas State University

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Bruce E. Rittmann

Arizona State University

César I. Torres

Arizona State University

Rosa Krajmalnik‐Brown

Arizona State University

Sudeep C. Popat

Clemson University

Hyung‐Sool Lee

University of Waterloo

Stacy L. Hutchinson

Kansas State University

Ryan R. Hansen

Kansas State University

Melanie M. Derby

Kansas State University

Rebecca Cors

University of Wisconsin–Madison

Bradley G. Lusk

United States Naval Research Laboratory

Cooperative Institutions

Arizona State University

Kansas State University

Tsinghua University

Chinese Academy of Sciences

University of Oklahoma

Tempe Union High School District

Lawrence Berkeley National Laboratory

John Wiley & Sons (United States)

Stanford University

State Key Joint Laboratory of Environment Simulation and Pollution Control

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Ammonia adsorption and recovery from swine wastewater permeate using naturally occurring clinoptilolite

Journal of Water Process Engineering (2021)

Arvind Damodara Kannan Prathap Parameswaran

Clinoptilolite

Energy-dispersive X-ray spectroscopy

10.1016/j.jwpe.2021.102234

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Citations (39)

Polyethylene glycol hydrogel coatings for protection of electroactive bacteria against chemical shocks

Bioelectrochemistry (2023)

Niloufar Fattahi Jeffrey A. Reed Evan Heronemus Priyasha Fernando Ryan R. Hansen

Loss of bioelectrochemical activity in low resource environments or from chemical toxin exposure is a significant limitation in microbial electrochemical cells (MxCs), necessitating the development of materials that can stabilize and protect electroactive biofilms. Here, polyethylene glycol (PEG) hydrogels were designed as protective coatings over anodic biofilms, and the effect of the hydrogel coatings on biofilm viability under oligotrophic conditions and ammonia-N (NH

Biofouling

10.1016/j.bioelechem.2023.108595

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Citations (2)

Effects of pulsed electric field treatment on enhancing lipid recovery from the microalga, Scenedesmus

Bioresource Technology (2014)

YenJung Sean Lai Prathap Parameswaran Ang Li Maria D. Baez Bruce E. Rittmann

Scenedesmus

10.1016/j.biortech.2014.09.124

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Citations (80)

Nitrogenase Activity in Cyanobacterial Biofilm

Trends in Biosciences/Trends in biosciences (2009)

Prathap Parameswaran S. Palani D. Venkatesan

The nitrogenase activity could be detected in cyanobacteria only when there is a special or temporal separation of photosynthesis and nitrogen fixation. We could induce the activity of nitrogenase in a few isolates of Oscillatoria, O. sancata is best in forming cyanobacterial biofilm with other heterocystous cyanobacteria. The activity of nitrogenase was detected when nitrate grown cells were starved for combined nitrogen for 1 to 15 days and grown in low light intensity of 6.022 x 1017 photons s−1 m−2. Therefore it appears that non-heterocystous cyanobacteria could very well participate in rice field N2 fixation. Perhaps it is necessary to have an indepth study of non-heterocystous forms to select ideal strains for use as biofertilizer mixed with heterocystous forms to make biofilm for higher nitrogen fixation in biofertilizer programme in wet land crops.

Biofertilizer

Oscillatoria

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Kinetics of electrooxidation of landfill leachate in a three-dimensional carbon bed electrochemical reactor

Chemosphere (2009)

N. Nageswara Rao Rohit Misra Gedam Nitin Prathap Parameswaran J.K. Astik

Kjeldahl method

Carbon fibers

10.1016/j.chemosphere.2009.06.009

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Citations (88)

Evaluation of energy-conversion efficiencies in microbial fuel cells (MFCs) utilizing fermentable and non-fermentable substrates

Water Research (2007)

Hyung‐Sool Lee Prathap Parameswaran Andrew Kato-Marcus César I. Torres Bruce E. Rittmann

10.1016/j.watres.2007.10.036

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Citations (392)

Draft Genome Sequence of the Gram-Positive Thermophilic Iron Reducer Thermincola ferriacetica Strain Z-0001 ^T

Genome Announcements (2015)

Bradley G. Lusk Jonathan P. Badalamenti Prathap Parameswaran Daniel R. Bond César I. Torres

A 3.19-Mbp draft genome of the Gram-positive thermophilic iron-reducing Firmicutes isolate from the Peptococcaceae family, Thermincola ferriacetica Z-0001, was assembled at ~100× coverage from 100-bp paired-end Illumina reads. The draft genome contains 3,274 predicted genes (3,187 protein coding genes) and putative multiheme c-type cytochromes.

Strain (injury)

Gram

Sequence (biology)

10.1128/genomea.01072-15

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Citations (14)

Human gut microbiota in obesity and after gastric bypass

Proceedings of the National Academy of Sciences (2009)

Husen Zhang John K. DiBaise Andrea Zuccolo Dave Kudrna Michele Braidotti

Recent evidence suggests that the microbial community in the human intestine may play an important role in the pathogenesis of obesity. We examined 184,094 sequences of microbial 16S rRNA genes from PCR amplicons by using the 454 pyrosequencing technology to compare the microbial community structures of 9 individuals, 3 in each of the categories of normal weight, morbidly obese, and post-gastric-bypass surgery. Phylogenetic analysis demonstrated that although the Bacteria in the human intestinal community were highly diverse, they fell mainly into 6 bacterial divisions that had distinct differences in the 3 study groups. Specifically, Firmicutes were dominant in normal-weight and obese individuals but significantly decreased in post-gastric-bypass individuals, who had a proportional increase of Gammaproteobacteria. Numbers of the H(2)-producing Prevotellaceae were highly enriched in the obese individuals. Unlike the highly diverse Bacteria, the Archaea comprised mainly members of the order Methanobacteriales, which are H(2)-oxidizing methanogens. Using real-time PCR, we detected significantly higher numbers of H(2)-utilizing methanogenic Archaea in obese individuals than in normal-weight or post-gastric-bypass individuals. The coexistence of H(2)-producing bacteria with relatively high numbers of H(2)-utilizing methanogenic Archaea in the gastrointestinal tract of obese individuals leads to the hypothesis that interspecies H(2) transfer between bacterial and archaeal species is an important mechanism for increasing energy uptake by the human large intestine in obese persons. The large bacterial population shift seen in the post-gastric-bypass individuals may reflect the double impact of the gut alteration caused by the surgical procedure and the consequent changes in food ingestion and digestion.

Pyrosequencing

10.1073/pnas.0812600106

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Citations (1,811)

Syntrophic interactions among anode respiring bacteria (ARB) and Non‐ARB in a biofilm anode: electron balances

Biotechnology and Bioengineering (2009)

Prathap Parameswaran César I. Torres Hyung‐Sool Lee Rosa Krajmalnik‐Brown Bruce E. Rittmann

We demonstrate that the coulombic efficiency (CE) of a microbial electrolytic cell (MEC) fueled with a fermentable substrate, ethanol, depended on the interactions among anode respiring bacteria (ARB) and other groups of micro-organisms, particularly fermenters and methanogens. When we allowed methanogenesis, we obtained a CE of 60%, and 26% of the electrons were lost as methane. The only methanogenic genus detected by quantitative real-time PCR was the hydrogenotrophic genus, Methanobacteriales, which presumably consumed all the hydrogen produced during ethanol fermentation ( approximately 30% of total electrons). We did not detect acetoclastic methanogenic genera, indicating that acetate-oxidizing ARB out-competed acetoclastic methanogens. Current production and methane formation increased in parallel, suggesting a syntrophic interaction between methanogens and acetate-consuming ARB. When we inhibited methanogenesis with 50 mM 2-bromoethane sulfonic acid (BES), the CE increased to 84%, and methane was not produced. With no methanogenesis, the electrons from hydrogen were converted to electrical current, either directly by the ARB or channeled to acetate through homo-acetogenesis. This illustrates the key role of competition among the various H(2) scavengers and that, when the hydrogen-consuming methanogens were present, they out-competed the other groups. These findings also demonstrate the importance of a three-way syntrophic relationship among fermenters, acetate-consuming ARB, and a H(2) consumer during the utilization of a fermentable substrate. To obtain high coulombic efficiencies with fermentable substrates in a mixed population, methanogens must be suppressed to promote new interactions at the anode that ultimately channel the electrons from hydrogen to current.

Acetogenesis

10.1002/bit.22267

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Citations (238)

Total Value of Phosphorus Recovery

Environmental Science & Technology (2016)

Brooke K. Mayer Lawrence A. Baker Treavor H. Boyer Pay Drechsel James Gifford

Phosphorus (P) is a critical, geographically concentrated, nonrenewable resource necessary to support global food production. In excess (e.g., due to runoff or wastewater discharges), P is also a primary cause of eutrophication. To reconcile the simultaneous shortage and overabundance of P, lost P flows must be recovered and reused, alongside improvements in P-use efficiency. While this motivation is increasingly being recognized, little P recovery is practiced today, as recovered P generally cannot compete with the relatively low cost of mined P. Therefore, P is often captured to prevent its release into the environment without beneficial recovery and reuse. However, additional incentives for P recovery emerge when accounting for the total value of P recovery. This article provides a comprehensive overview of the range of benefits of recovering P from waste streams, i.e., the total value of recovering P. This approach accounts for P products, as well as other assets that are associated with P and can be recovered in parallel, such as energy, nitrogen, metals and minerals, and water. Additionally, P recovery provides valuable services to society and the environment by protecting and improving environmental quality, enhancing efficiency of waste treatment facilities, and improving food security and social equity. The needs to make P recovery a reality are also discussed, including business models, bottlenecks, and policy and education strategies.

Resource Recovery

Equity

10.1021/acs.est.6b01239

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Citations (577)