An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Sarah A. Doydora; Dorcas Franklin; Peizhe Sun; Miguel Cabrera; Aaron Thompson; Kimberly Love-Myers; John Rema; Vaughn Calvert; Spyros G. Pavlostathis; Ching-Hua Huang
... Polyether ionophores, monensin, and salinomycin are commonly used as antiparasitic drugs in broiler production and may be present in broiler litter (bird excreta plus bedding material). Long-term application of broiler litter to pastures may lead to ionophore contamination of surface waters. Because polyether ionophores break down at low pH, we hypothesized that decreasing litter pH with an acidic ...
barges; basins; dams (hydrology); laws and regulations; rivers; soybeans; waterways; Amazon River; Brazil
Abstract:
... Brazil plans to build 43 “large” dams (>30 MW) in the Tapajós Basin, ten of which are priorities for completion by 2022. Impacts include flooding indigenous lands and conservation units. The Tapajós River and two tributaries (the Juruena and Teles Pires Rivers) are also the focus of plans for waterways to transport soybeans from Mato Grosso to ports on the Amazon River. Dams would allow barges to ...
... Matching the trend seen among the major large rivers of the globe, the Amazon River and its tributaries are facing aquatic ecosystem disruption that is affecting freshwater habitats and their associated biodiversity, including trends for decline in fishery resources. The Amazon’s aquatic ecosystems, linked natural resources, and human communities that depend on them are increasingly at risk from a ...
Margaret E. Stevenson; Regina Sommer; Gerhard Lindner; Andreas H. Farnleitner; Simon Toze; Alexander K.T. Kirschner; Alfred P. Blaschke; Jatinder P.S. Sidhu
Mastadenovirus; aquifers; bacteriophages; calcite; ionic strength; laboratory experimentation; limestone; nanoparticles; pH; pathogens; porous media; soil; virulent strains; South Australia
Abstract:
... The transport of human adenovirus, nanoparticles, and PRD1 and MS2 bacteriophages was tested in fine granular limestone aquifer material taken from a borehole at a managed aquifer recharge site in Adelaide, South Australia. Comparison of transport and removal of virus surrogates with the pathogenic virus is necessary to understand the differences between the virus and surrogate. Because experiment ...
... Bacteria removal efficiencies in a conventional soil-based wastewater treatment system (OWTS) have been modeled to elucidate the fate and transport of E. coli bacteria under environmental and operational conditions that might be expected under changing climatic conditions. The HYDRUS 2D/3D software was used to model the impact of changing precipitation patterns, bacteria concentrations, hydraulic ...
... Biopiles can be used to dispose of slaughterhouse residuals (SLRs); however, the fate of pathogenic bacteria (e.g., pathogenic strains of Eschericia coli, Streptococcus fecalis) in these systems is not well understood. The transport of these bacteria in water leaching from the biopile could represent a significant contamination source. This research examined the transport of Enterobacteriaceae and ...
ammonium; denitrification; ecosystems; freshwater; nitrate nitrogen; nitrates; nitrogen; organic soils; pollution load; ponds; stable isotopes; streams; watersheds; wetlands; New England region; Rhode Island
Abstract:
... Beaver-created ponds and dams, on the rise in the northeastern United States, reshape headwater stream networks from extensive, free-flowing reaches to complexes of ponds, wetlands, and connecting streams. We examined seasonal and annual rates of nitrate transformations in three beaver ponds in Rhode Island under enriched nitrate-nitrogen (N) conditions through the use of ¹⁵N mass balance techniqu ...
... Sewage sludges from urban wastewater treatment plants are often used to remediate degraded soils. However, the benefits of their use in metal-polluted soils remain unclear and need to be assessed in terms of factors besides soil fertility. This study examines the use of thermal-dried sewage sludge (TDS) as an amendment for heavy metal–polluted soil in terms of its effects on soil chemical properti ...
... Biomass and contaminant accumulation and partitioning in plants determine the harvest stage for optimum contaminant uptake during phytoremediation of municipal biosolids. This wetland microcosm bioassay characterized accumulation and partitioning of biomass, nutrients (N and P), and trace elements (Zn, Cu, Cr, and Cd) in cattail (Typha latifolia L.) in a growth room. Four cattail seedlings were tr ...
... OBJECTIVE: To retrospectively investigate a novel surgical technique using the Fitz Intervertebral Traction Screw (FITS) combined with string‐of‐pearl (SOP™) locking plates for the treatment of Disc Associated Wobbler Syndrome (DAWS). STUDY DESIGN: Case series (n = 16). METHODS: Ventral approach and fenestration of the affected disc(s), nuclear extirpation, and insertion of the FITS device to the ...
Escherichia coli; Pseudomonas putida; aquifers; bacteriophages; drinking water; filtration; fluorescence; gravel; groundwater; mass transfer; monitoring; solutes; tracer techniques; wells; Germany; Western European region
Abstract:
... Gravel aquifers act as important potable water sources in central western Europe, yet they are subject to numerous contamination pressures. Compositional and textural heterogeneity makes protection zone delineation around groundwater supplies in these units challenging; artificial tracer testing aids characterization. This paper reappraises previous tracer test results in light of new geological a ...
... The need to mitigate nitrate export from corn and soybean fields with subsurface (tile) drainage systems, a major environmental issue in the midwestern United States, has made the efficacy of field-edge, subsurface bioreactors an active subject of research. This study of three such bioreactors located on the University of Illinois South Farms during their first 6 mo of operation (July–Dec. 2012) f ...
... Current knowledge on coccinellids is primarily focused on their role as natural enemies of soft-bodied insects. However, there is a great diversity of coccinellid parasitoid species that are less studied. Here, we describe new records of coccinellid parasitoids with emphasis on new host–parasitoid interactions in 11 sample sites in Brazil. We collected 122 coccinellid individuals parasitized by si ...
... Polyvalent infectious bronchitis virus vaccination is common worldwide. The possibility of vaccine interference after simultaneous combined vaccination with Arkansas (Ark) and Massachusetts (Mass)-type vaccines was evaluated in an effort to explain the high prevalence of Ark-type infectious bronchitis virus in vaccinated chickens. Chickens ocularly vaccinated with combinations of Ark and Mass show ...
... Queens of leaf-cutting ants found their nests singly, each consisting of a vertical tunnel and a final horizontal chamber. Because of the claustral mode of nest founding, the queen and/or her initial fungus garden are exposed to threats imposed by several soil pathogens, and the antibiotic secretions produced by their metapleural glands are considered a main adaptation to deal with them. Nests of ...
... Tembusu virus (TMUV) belongs to the genus Flavivirus that may cause severe egg drop in ducks. In order to evaluate the most efficient TMUV detection method, the performances of a conventional RT-PCR (C-RT-PCR), a semi-nested PCR (SN-RT-PCR), a reverse-transcriptase real-time quantitative PCR (Q-RT-PCR), and a reverse-transcription loop-mediated isothermal amplification (RT-LAMP) targeting the TMUV ...
... Vaccination is the main tool implemented in Egypt since 2007 to control H5N1 avian influenza. The present study aimed at comparing the effectiveness of three avian influenza vaccination regimes in commercial broiler chickens carrying high levels of maternally derived antibodies (MDAs). Day-old chicks were divided into four experimental groups. Group I received only the rHVT-H5 vaccine (recombinant ...
... Traumatic and infectious diseases of the eye and orbit can occur in horses. For diagnosis and monitoring of such diseases, medical imaging is useful including computed tomography (CT) and magnetic resonance imaging (MRI). The aim of the current study was to describe CT and MRI anatomy of the equine orbit and ocular globe. The heads from four adult horses were scanned with a 6‐slice Emotion 6 CT (S ...
... Ornithobacterium rhinotracheale (ORT) is a Gram-negative bacillus that causes respiratory disease in birds, and directly affects the poultry industry. The mechanisms behind these infections are not completely known. Currently, its capacity to form biofilms on inert surfaces has been reported; however, the conditions for biofilm development have not been described yet. The present work was aimed at ...
... The movement and fate of herbicides in soils under various environmental factors are important in evaluating their mobility and ecological impact. The effects of sterilization, solarization, and soil physicochemical properties on the degradation of herbicide mesotrione in three soils from China were evaluated using laboratory incubation method, and the degradation kinetics were also simulated usin ...
Tabanidae; abdomen; callus; females; insect taxonomy; legs; new species; ocelli; sclerotization; taxonomic keys; wings; Brazil
Abstract:
... Dichelacera (Dichelacera) walteri Guimarães, Gorayeb & Rodrigues-Guimarães n. sp. is described from female specimens collected in Marambaia Island, located in Mangaratiba County, state of Rio de Janeiro, Brazil. The characterization of the species was based in the following characters: a medium-sized species, more sclerotized than others in the subgenus Dichelacera Macquart, the second segment of ...
body condition; body weight; cats; dogs; excision; hemorrhage; image analysis; injection site; mixed breeds; nerve tissue; osteosarcoma
Abstract:
... OBJECTIVE: To provide (1) a comprehensive description of hemipelvectomy; and (2) report clinical application and outcome of hemipelvectomy in dogs and cats. STUDY DESIGN: Descriptive report and retrospective case series. ANIMALS: Dogs (n = 4) and 5 cats. METHODS: Cadaveric dissection was performed for imaging purposes using 4 mixed breed dogs euthanatized for reasons unrelated to this study. Medic ...
... The presence of purple bacteria in manure storage lagoons is often associated with reduced odors. In this study, our objectives were to determine the occurrence of purple sulfur bacteria (PSB) in seven dairy wastewater lagoons and to identify possible linkages between wastewater properties and purple blooms. Community DNA was extracted from composited wastewater samples, and a conservative 16S rRN ...
aromatic hydrocarbons; chemical bonding; composite polymers; electricity; fullerene; heterocyclic compounds; polymerization; solar cells; solar energy; solar radiation
Abstract:
... Harvesting solar energy from sunlight to generate electricity is considered as one of the most important technologies to address the future sustainability of humans. Polymer solar cells (PSCs) have attracted tremendous interest and attention over the past two decades due to their potential advantage to be fabricated onto large area and light-weight flexible substrates by solution processing at a l ...
... Alum [Al₂(SO4)₃ ·14H₂O] addition to poultry litter has been shown to reduce ammonia (NH₃) concentrations in poultry houses; however, its effects on greenhouse gas (GHG; N₂O, CH₄, and CO₂) emissions is unknown. The objectives of this study were to determine the effects of alum additions on (i) in-house NH₃ and GHG concentrations, (ii) NH₃ and GHG emissions, and (iii) litter chemical properties. Two ...
data collection; dogs; gait; kinematics; models; stifle; surgery
Abstract:
... OBJECTIVE: To evaluate examiner variability in a superficial skin marker model of canine stifle kinematics. STUDY DESIGN: Experimental. ANIMALS: Six clinically normal dogs. METHODS: Dogs had 11 retroreflective markers fixed to the skin on the right hindlimb. Dogs were trotted 5 times through the calibrated testing space and this was repeated on 4 different testing days. Examiner A applied all mark ...
... Knowledge of how effectively microbes are transported through porous media is useful for water resource/wastewater management. Despite much research having been done to characterize microbial contaminant transport through various sedimentary materials, very little study has been made on coral sand, such as constitutes the primary substrate of many Pacific atolls. We conducted a set of laboratory c ...
Thoroughbred; adults; analysis of variance; bacteria; chlorhexidine; horses; plate count; polymerase chain reaction; surgery
Abstract:
... OBJECTIVE: To compare the efficacy of sterile preoperative skin antisepsis using either a 5‐minute mechanical preparation or 5‐minute non‐mechanical preparation with chlorhexidine gluconate 4% solution. STUDY DESIGN: Matched design, ANOVA. ANIMALS: Healthy adult Thoroughbred horses (n = 30). METHODS: Each horse had both surgical preparation methods randomly assigned to identical sites on the left ...
... OBJECTIVES: To investigate whether administration of postoperative oral antimicrobial drugs has a beneficial effect on preventing surgical site infections (SSI) in clean orthopedic surgery involving stainless steel plating systems. STUDY DESIGN: Randomized prospective clinical study. ANIMALS: Dogs (n = 97). METHODS: One hundred consecutive cases (97 dogs) that had clean orthopedic surgery requirin ...
... New institutions are critically needed to improve the resilience of social–ecological systems globally. Watershed management offers an important model due to its ability to govern mixed-ownership landscapes through common property regimes, translating national goals into local action. Here, I assess the efficacy of state watershed management institutions in the Pacific Northwest, based on their ab ...
... Highly hydrophobic organic chemicals (HOCs), like pyrethroids, adsorb strongly to eroded soil and suspended sediment. Therefore, total suspended solids (TSS) concentration in the water column of receiving waters is important for determining the proportion of chemical in the sediment-sorbed vs. the dissolved (bioavailable) state. However, most current regulatory exposure models, such as the Exposur ...
... OBJECTIVES: To evaluate avian allogeneic demineralized bone matrix (DBM) in the healing of long bone defects as a function of geometry and time in a pigeon model. STUDY DESIGN: Experimental. ANIMALS: Adult rock pigeons (n = 60). METHODS: Midshaft ulnar osseous defects were grafted with 2 geometric forms of DBM (tubular vs. chipped) and stabilized with a hybrid fixator. Autologous chips of sternal ...
Vespula vulgaris; chemical analysis; cleaning; exocrine glands; legs; males; social insects; surveys
Abstract:
... This study brings a survey of the exocrine glands in the legs of Vespula vulgaris wasps. We studied workers, males, virgin queens as well as mated queens. A variety of 17 glands is found in the different leg segments. Among these, five glands are novel exocrine structures for social insects (trochanter-femur gland, ventrodistal tibial gland, distal tibial sac gland, ventral tibial gland, and ventr ...
... Aquaporin‐1 (AQP1), a six‐transmembrane domain protein, belongs to a highly conserved group of proteins called aquaporins known to regulate permeability across cell membranes. Although the role of AQP1 has been extensively studied, its specific activity along the gastrointestinal tract in animals during early postnatal development is poorly known. This study investigates the expression of AQP1 mRN ...
... Surface waters are commonly used as source water for drinking water and irrigation. Knowledge of sources of fecal pollution in source watersheds benefits the design of effective source water protection plans. This study analyzed the relationships between enteric pathogens (Escherichia coli O157:H7, Salmonella spp., and Campylobacter spp. [C. jejuni, C. lari and C. coli]), water quality (turbidity, ...
Xunde Li; Edward R. Atwill; Elizabeth Antaki; Olin Applegate; Brian Bergamaschi; Ronald F. Bond; Jennifer Chase; Katherine M. Ransom; William Samuels; Naoko Watanabe; Thomas Harter
Campylobacter; Enterococcus; Escherichia coli O157; Salmonella; alluvial aquifer; antibiotic resistance; antibiotics; concentrated animal feeding operations; dairies; groundwater; irrigation; land use; monitoring; potassium; surveys; virulent strains; water quality; wells; California
Abstract:
... Surveys of microbiological groundwater quality were conducted in a region with intensive animal agriculture in California, USA. The survey included monitoring and domestic wells in eight concentrated animal feeding operations (CAFOs) and 200 small (domestic and community supply district) supply wells across the region. Campylobacter was not detected in groundwater, whereas Escherichia coli O157:H7 ...
... In the present study, two experiments were designed to investigate the lethal and sublethal effects of methoxyfenozide on Spodoptera litura (F.). The first experiment was conducted to explore the fitness cost of methoxyfenozide resistance in a methoxyfenozide-resistant strain (selected with methoxyfenozide for 13 consecutive generations), leading to resistance ratio to methoxyfenozide 83.0- and 23 ...
... Metal ions and anions play important roles in many industrial and biochemical processes, and thus it is highly desired to detect them in the relevant systems. Small organic molecule based sensors for selective and sensitive detection of target ions show the advantages of low cost, high sensitivity and convenient implementation. In this area, pyrrole has incomparable advantages. It can be easily in ...
... This paper provides the first comparative anatomical study of the explosive pygidial defensive system of bombardier beetles in species classified in three brachinine subtribes: Brachinus (Brachinina), Pheropsophus (Pheropsophina) and Aptinus (Aptinina). We investigated the morphology and ultrastructure of this system using optical, fluorescence, and focused ion beam (FIB/SEM) microscopy. In doing ...
... The structure and histochemical properties of the intestine in bronze corydoras (Corydoras aeneus), a stomach‐containing teleost, are described, with emphasis on goblet cells and mucin types. The proximal intestine displayed a normal structure for teleosts, whereas the distal intestine was wide, translucent, thin‐walled, richly vascularized and constantly filled with air, suggesting an important r ...
... There is a general scarcity of data on the histological structure of major organs in the Eurasian beaver (Castor fiber). This study presents the histological characteristics of beaver organs such as the liver, spleen, cardiac muscle, lungs and kidneys. Tissue samples were collected from 21 beavers and analysed. Selected samples of tail tissue were additionally examined. Tissue samples were placed ...
Nobel Prize; chemical bonding; chemical reactions; computational methodology; development theory; models; quantum mechanics; solids; wills
Abstract:
... Almost a century has passed since valence bond (VB) theory was originally introduced to explain covalent bonding in the H₂ molecule within a quantum mechanical framework. The past century has seen constant improvements in this theory, with no less than two distinct Nobel prizes based on work that is essentially developments in VB theory. Additionally, ongoing advances in both methodology and compu ...
... Ionic liquids (IL) and hydrogen bonding (H-bonding) are two diverse fields for which there is a developing recognition of significant overlap. Doubly ionic H-bonds occur when a H-bond forms between a cation and anion, and are a key feature of ILs. Doubly ionic H-bonds represent a wide area of H-bonding which has yet to be fully recognised, characterised or explored. H-bonds in ILs (both protic and ...
... In the present study, the immune protective effects of recombinant microneme protein 7 of Eimeria maxima (rEmMIC7) and a DNA vaccine encoding this antigen (pVAX1-EmMIC7) on experimental challenge were evaluated. Two-week-old chickens were randomly divided into five groups. Experimental groups of chickens were immunized with 100 μg DNA vaccine pVAX1-MIC7 or 200 μg rEmMIC7, while control groups of c ...
... Gallibacterium anatis is a major cause of reproductive tract infections in chickens. Here, we aimed to evaluate the efficacy of the recombinant protein GtxA-N at protecting hens, by addressing three objectives; (i) evaluating the antibody response following immunization (ii) scoring and comparing lesions, following challenge with G. anatis , in immunized and non-immunized hens and (iii) investigat ...
... Odorous emissions from agricultural and waste management operations can cause annoyance to local populations. Volatile sulfur compounds (VSCs) are dominant odorants that are often lost during collection using sample bags. The degree of VSC losses depends on factors such as storage time, bag materials, temperature, sample relative humidity (RH), light exposure, and the presence of volatile organic ...
biomass; chlorophyll; dams (hydrology); data collection; eutrophication; growing season; hydrology; lakes; limnology; models; nutrients; phytoplankton; risk; seston; temporal variation; total phosphorus; turbidity; water quality; water quality criteria; water quality standards; Arkansas
Abstract:
... To address water quality standards needed to prevent accelerated eutrophication, many states in the United States have developed effects-based standards related to nutrients. In many cases, this has resulted in specific standards for Secchi transparency (ST) and phytoplankton biomass measured as sestonic chlorophyll a (chl-a). The state of Arkansas recently adopted its first effects-based water qu ...
... This study focused on the importance of the colmation layer in the removal of cyanobacteria, viruses, and dissolved organic carbon (DOC) during natural bank filtration. Injection-and-recovery studies were performed at two shallow (0.5 m deep), sandy, near-shore sites at the southern end of Ashumet Pond, a waste-impacted, kettle pond on Cape Cod, MA, that is subject to periodic blooms of cyanobacte ...
... Conventional indirect approaches for estimating pesticide volatility from agricultural fields require an air dispersion model and near-field, temporal air concentration measurements. The model pesticide flux profile is chosen such that field observations are recovered. Ross et al. (1996) first proposed a back-calculation method (BCM) using a single iteration of the Industrial Source Complex Short ...
... OBJECTIVES: To evaluate the effect of periosteal transection and elevation in foals with naturally occurring carpal valgus deviation. STUDY DESIGN: Prospective clinical study. ANIMALS: Foals (n = 9) with bilateral carpal valgus. METHODS: Foals with bilateral carpal valgus had distolateral radial periosteal transection and elevation (PE) including distal ulnar transection on 1 limb. Foals were stal ...