A5043522789- Biofuel production and bioconversion
- Microbial Metabolic Engineering and Bioproduction
- Biomedical and Engineering Education
- Anaerobic Digestion and Biogas Production
- Wastewater Treatment and Nitrogen Removal
- Engineering Education and Pedagogy
- Bioenergy crop production and management
- Engineering Education and Curriculum Development
- Phosphorus and nutrient management
- Agriculture Sustainability and Environmental Impact
- Constructed Wetlands for Wastewater Treatment
- Experimental Learning in Engineering
- Career Development and Diversity
- Soil and Water Nutrient Dynamics
- Innovative Teaching Methods
- Microbial Inactivation Methods
- Mechatronics Education and Applications
- Effects and risks of endocrine disrupting chemicals
- Pharmaceutical and Antibiotic Environmental Impacts
- Research Data Management Practices
- Membrane Separation Technologies
- Scientific Computing and Data Management
- Soil Carbon and Nitrogen Dynamics
- Ultrasound and Cavitation Phenomena
- Science Education and Perceptions
Iowa State University
2014-2024
Cornell University
2002-2024
Western Michigan University
2024
Knoxville College
2002-2024
Washington University in St. Louis
2024
Dakota State University
2024
North Dakota State University
2024
Planetary Science Institute
2024
Johns Hopkins University
2024
University of Tennessee at Knoxville
1995-2020
Naturally occurring estrogens in animal wastes may cause negative environmental impacts, yet their abundance waste treatment and storage structures is poorly documented. To better quantify estrogen concentra tions wastes, multiple samples were collected from at dairy swine facilities analyzed for concentrations of 17β-estradiol (E2), estrone (E1), 17α-estradiol by gas chromatography−mass spectroscopy enzyme linked immunosorbent assay (E2 only). Mass ratios each to the macronutrients...
Net fluxes of NH(4) (+) and NO(3) (-) into roots 7-day-old barley (Hordeum vulgare L. cv Prato) seedlings varied both with position along the root axis time. These variations were not consistent between replicate plants; different showed unique temporal spatial patterns uptake. Axial scans net conducted apical 7 centimeters seminal intact in solution culture using ion-selective microelectrodes unstirred layer immediately external to surface. Theoretically derived relationships uptake...
Muconic acid, an unsaturated diacid that can be produced from cellulosic sugars and lignin monomers by fermentation, emerges as a promising intermediate for the sustainable manufacture of commodity polyamides polyesters including Nylon-6,6 polyethylene terephthalate (PET). Current conversion schemes consist in biological production cis,cis-muconic acid using metabolically engineered yeasts bacteria, subsequent diversification to adipic terephthalic their derivatives chemical catalysts. In...
The Midwestern U.S. landscape is one of the most highly altered and intensively managed ecosystems in country. predominant crops grown are maize (Zea mays L.) soybean [Glycine max (L.) Merr]. They typically as monocrops a simple yearly rotation or with multiple years (2 to 3) followed by single year soybean. This system productive because management systems have been well adapted regional growing conditions through substantial public private investment. Furthermore, markets supporting...
Technoeconomic analyses using established tools such as SuperPro Designer® require a level of detail that is typically unavailable at the early stage process evaluation. To facilitate this, members our group previously created spreadsheet-based modeling and technoeconomic platform explicitly aimed joint fermentative‒catalytic biorefinery processes. In this work, we reorganization expansion model—ESTEA2 (Early State Analysis, version 2), including detailed design cost calculations for new...
A growing global meat demand requires a decrease in the environmental impacts of production. Cultured (CM) can potentially address multiple challenges facing animal agriculture, including those related to welfare and impacts, but existing cost analyses suggest it is hard for CM match relatively low costs conventionally produced meat. This study analyzes literature reports contextualize CM's protein calorie use efficiencies, comparing products' feed conversion ratios, areal productivities,...
Abstract Laboratory and field experiments were conducted using magnesium chloride (MgCl2) to force the precipitation of struvite (MgNH4PO4·6H2O) reduce concentration soluble phosphorus (SP) in swine waste. In laboratory experiments, reductions SP 76% (572 135 mg P l−1) observed raw manure after addition at a rate calculated provide 1.6:1 molar ratio (Mg) total phosphorus. Adjusting pH treated 9.0 with sodium hydroxide (NaOH) increased reduction 91% 50 l−1). X-ray diffraction precipitate...
A prototype field-deployable acoustic insect flight detector was constructed from a noise-canceling microphone coupled to an off-the-shelf digital sound recorder capable of 10 h recordings. The system placed in urban forest setting 25 times over the course summer 2004, collecting 250 ambient recordings that were downloaded personal computer and used develop detection routines. These routines operated on short segments (0.093 s, corresponding 4096 samples at 44100 Hz). variety approaches...
C onventional agriculture production systems in developed countries rely heavily on fossil energy, but emerging uncertainties energy supply indicate a need to better understand efficiency conventional and alternative systems. We used 6 yr of data from cropping experiment conducted Iowa compare use conventionally managed corn ( Zea mays L.)–soybean [ Glycine max (L.) Merr.] system (a 2‐yr rotation) with two low‐external input (LEI) that more diverse rotations manure, substantially lower...
Integrating perennial groundcovers (PGC) — sometimes referred to as living mulches or cover crops into annual cash-crop systems could address root causes of bare-soil practices that lead negative impacts on soil and water quality. Perennial bring otherwise absent functional traits namely perenniality preserve regenerate water, carbon, nutrient cycles. However, if not optimized, they can also cause competitive interactions yield loss. When designing PGC systems, the goal is maximize...
Manureborne estrogens are increasingly recognized as a potential ecological hazard. However, samplehandlingprotocols for these compounds not clearly delineated in the literature, nor comparisons between assays estrogens.A study was conducted to explore degradation of estrogen separated dairy manure waste solids (press cake), using threepopular assay types. Estrogens were measured by enzymelinked immunosorbent (ELISA), gaschromatographymassspectroscopy (GCMS) and recombinant yeast reporter...
Here we report on a static, algebraic, spreadsheet-implemented modeling approach to estimate the costs, energy inputs and outputs, global warming potential of biomass feedstocks. Inputs model included literature sourced data for: environmental factors, crop physiological-parameters such as radiation use efficiency water efficiency, cost components. Using an energy-input-output life-cycle-assessment approach, calculated associated with each component, allowing total required produce fuel...
Livestock in the state of Iowa, United States (US) produce over 50 × 106 Mg wet-basis manure yearly. Biogas production from manure’s anaerobic digestion (AD) can reduce greenhouse gas emissions, control odors, and provide renewable energy. Despite these benefits, AD is rarely deployed at swine farms Iowa. In this work, we explore economics systems Iowa to evaluate reasons for low deployment cost impacts biogas cleaning injection into natural grid, amending with biomass, centralizing...
This article presents the biochemical methane potential (BMP) results from anaerobic digestion (AD) of switchgrass. Triplicate BMP assays were performed on: untreated switchgrass, aqueous ammonia soaking (AAS) pretreated switchgrass (soaked in 29.5% reagent-grade at 5 L kg-1 for d), and AAS-pretreated plus cellulytic enzymes 12.5, 25, 62.5, 125 filter paper units (FPU) enzyme g-1 volatile solids (VS). Biogas production biogas content measured daily all treatments 21 d. Both corrected varied...
Abstract The potential of ultrasonics to replace hydrocooking in corn‐to‐ethanol plants was examined this study. Batch and continuous experiments were conducted on corn slurry with sonication at a frequency 20 kHz. mode used catenoidal horn operated an amplitude 144 μm peak‐to‐peak (p–p) for 90 s. Continuous donut operating inner radius 12 p–p . Jet‐cooked samples from the same ethanol plant compared ultrasonicated samples. highest starch‐to‐ethanol conversion obtained by jet‐cooked yield...
In biosecure composting, animal mortalities are so completely isolated during the degradation process that visual inspection cannot be used to monitor progress or status. One novel approach is volatile organic compounds (VOCs) released by decaying and use them as biomarkers of A new method was developed quantitatively analyze potential biomarkers--dimethyl disulfide, dimethyl trisulfide, pyrimidine, acetic acid, propanoic 3-methylbutanoic pentanoic hexanoic acid--from field-scale mortality...
This article charts the progress of CenUSA Bioenergy, a USDA-NIFA-AFRI coordinated agricultural project focused on North Central region US. CenUSA's vision is to develop regional system for producing fuels and other products from perennial grass crops grown marginally productive land or that otherwise unsuitable annual cropping. focuses contributions has made nine primary systems needed make this reality: feedstock improvement; production marginal land; logistics; modeling performance;...