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.
... A new semi-analytical solution to study groundwater flow fields associated with pumping or injection wells in confined isotropic aquifers with uniform regional flow is proposed and tested against steady-state and transient-state numerical simulations on MODFLOW-MODPATH. The solution is based on the complex potential theory and can be used for large numbers of arbitrarily positioned wells operated ...
... Abelmoschus esculentus (AE) has been used in traditional medicine to ameliorate hyperglycemia, but its mucilage increased bioassay difficulties. We have obtained a series of AE subfractions. Among them F1 and F2 regulated dipeptidyl peptidase-4 (DPP-4) and type 1 glucagon-like peptide receptor (GLP-1R), the treatment targets for type 2 diabetes. F1, F2 and fraction residues (FR) showed advantage o ...
... Progresses in the development of self-healing materials have resulted in transition from repairing damaged materials via external interference to autonomous internal healing process. This paper explores reaction between acrylated expoxidized soybean oil (AESO) with pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) hardener, followed by microencapsulation of AESO for its potential use in a nov ...
data collection; disease prevention; hemorrhage; hospitals; infarction; local government; metropolitan areas; mortality; patients; regression analysis; retrospective studies; rural areas; rural health; socioeconomic factors; socioeconomic status
Abstract:
... OBJECTIVE: To identify the extent to which rurality influences the admission and mortality rates for acute circulatory complications among people with type 2 diabetes mellitus. DESIGN: Retrospective study. SETTING: All Victorian hospitals. PARTICIPANTS: State‐wide hospital admissions from 1 July 2010 to 30 June 2015 using the Victorian Admitted Episodes Dataset. Data included patients with type 2 ...
... Chicken primordial germ cells (PGCs) are the primary pluripotent stem cell types that will differentiate towards germ cells. High aldehyde dehydrogenase (ALDH) activity is considered as a functional marker for the detection of cell ‘stemness’. In our study the ALDEFLUOR™ kit was used for determination of ALDH activity in PGCs. PGCs were co-stained with diethylaminobenzaldehyde (DEAB) and ALDH and ...
analytical methods; aquifers; concrete; hydraulic conductivity; power plants; water table; China
Abstract:
... An analytical method has been proposed to estimate the leakage from a water-filling tunnel between two reservoirs, based on Darcy’s law and the position of the water table, for a phreatic aquifer. The variable water-fill level in the tunnel and an arbitrary intersection angle between the tunnel and horizontal plane were considered. The reliability of this method was validated by numerical analysis ...
Colpocephalum turbinatum; Columbiformes; Pandion haliaetus; Strigiformes; ancestry; aquatic organisms; birds of prey; doves; habitats; hosts; nestlings; parasites; parasitism; pigeons; water birds; Saudi Arabia
Abstract:
... Parasitism is a hostile relationship that helps greatly in the development and evolution of many creatures in their race for survival. Chewing lice of nestlings of the osprey Pandion haliaetus (L.) have been studied in Farasan Island, Saudi Arabia. All previous chewing lice records from this bird have also been reviewed. Four species of chewing lice are previously known to infest P. haliaetus. The ...
alluvium; aquifers; assets; atmospheric precipitation; base flow; bedrock; cities; drainage; drinking water; groundwater; irrigation; models; permeability; sedimentary rocks; streams; surface water; tectonics; water budget; water supply; watersheds; China
Abstract:
... Shenzhen is the major financial and high-tech center in southern China. The megacity has grown rapidly in the last 40 years with the population increasing from about 30,000 in 1979 to 20 million in 2016. The study area (2,015 km²) is about 42% urban and 58% undeveloped land. The rapid development of the megacity has resulted in severe degradation of the groundwater and surface-water resources and ...
Citrus; Erebidae; Eudocima; adults; growers; growing season; moths; orchards; pests; South Africa
Abstract:
... Fruit-piercing moths are a sporadic pest of citrus, especially in the Eastern Cape Province of South Africa, where the adults can cause significant damage in outbreak years. However, growers confuse fruit-piercing moths with fruit-sucking moths that do not cause primary damage. In this study we trapped these moths during the 2013–2015 growing seasons. A large number of diverse fruit-feeding moths ...
... Peroxisome proliferator-activated receptor α (PPARα) is a nuclear hormone receptor that transcriptionally regulates lipid metabolism and inflammation; therefore, PPARα agonists are promising agents to treat dyslipidemia and metabolic disorders. PPARα full agonists, such as fibrates, are effective anti-hypertriglyceride agents, but their use is limited by adverse side effects. Hence, the aim of thi ...
... Depression and anxiety often co-occur with cardiac diseases. The Shexiang Baoxin pill (SBP) is a proprietary Chinese medicine initially used to treat cardiac conditions. This study explored whether SBP has antidepressant and anxiolytic effects in addition to hormonal and psychotropic mechanisms. Mice underwent 6 weeks of chronic unpredictable mild stress (CUMS) to induce depression- and anxiety-li ...
... Antibiotic resistance is an increasingly global problem that requires different approaches to be undertaken. This article argues that games could be used to complement existing antibiotic-resistance awareness campaigns as they have several characteristics that could help people engage with information. ...
... The use of artificial substratum made out of poly-β-hydroxybutyrate (PHB) based biodegradable plastic for penaeid shrimp culture was investigated for the first time. Provision of PHB substratum consisting of PHB type P209 (Biomer, Krailling, Germany) to postlarval whiteleg shrimp Litopenaeus vannamei (106 ± 52 mg) resulted in significantly higher survival (P ≤ 0.05) of 83.6 ± 3.4% as compared to 7 ...
... The aquifer of the Oltrepò Pavese plain (northern Italy) is affected by paleo-saltwater intrusions that pose a contamination risk to water wells. The report first briefly describes how the presence of saline water can be predicted using geophysical investigations (electrical resistivity tomography or electromagnetic surveys) and a machine-learning tool specifically developed for the investigated a ...
... The use of snowmelt as an inexpensive multi-component tracer solution for active aquifer characterization is investigated, creating a valid alternative to existing artificial water isotope labelling using enriched deuterium oxide (²H₂O) and water-¹⁸O (H₂¹⁸O). The approach directly takes advantage of natural differences between groundwater and precipitation. It is shown, at laboratory-scale and sma ...
amino acid sequences; antibiotics; drugs; electronic equipment; enantiomers; gene transfer; medical equipment; nanotubes; permeability; safety testing; surface area
Abstract:
... Self-assembled cyclic peptide nanotubes (cPNTs) have recently drawn particular attention as one of the most intriguing nanostructures in the field of nanotechnology. Given their unique features including high surface area, increased drug loading, environmental stability, enhanced permeation, and modifiable drug release, these hollow tubular structures can be constructed with cyclic di-, tri-, tetr ...
Fourier transform infrared spectroscopy; X-ray diffraction; antibacterial properties; cost effectiveness; energy conservation; gold; gum arabic; manufacturing; metal ions; monitoring; nanocomposites; nanometals; silver; surface plasmon resonance; temperature; transmission electron microscopy
Abstract:
... Bio-synthesis of nanostructures is an ever green approach; therefore, the current work attempts to use Arabic gum as bio-synthesizer for manufacturing Ag–Au bimetallic nanocomposite, using seed-mediated growth technique. The relevance of the as-used natural gums for manufacturing of Ag–Au nanocomposite in quite simple, energy saving and cost effective methodology, has been successfully approved. A ...
Ceratitis capitata; Citrus; cultivars; databases; fruit crops; fruit flies; fruits; geographic information systems; geographical distribution; integrated pest management; pome fruits; small fruits; spatial distribution; spatial variation; sterile insect technique; stone fruits; temporal variation; trapping; traps; wine grapes; South Africa
Abstract:
... The area-wide spatio-temporal distribution of Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) trap catches was investigated in the regions of Elgin/Grabouw, Villiersdorp and Vyeboom, collectively known as EGVV, Western Cape, South Africa. The primary fruit crops planted in EGVV include various varieties and cultivars of pome fruit, stone fruit, citrus, wine grapes and berries. Fruit fly trap ...
aquacultural and fisheries equipment; burning; bycatch; energy; fish; fishing boats; greenhouse gas emissions; industrialization; lamps; marine debris; overfishing; vision
Abstract:
... Fishing with an artificial light stimulus has existed for thousands of years. It started with simple techniques such as burning a large fire on the beach to attract fish, but over the centuries it has become increasingly technologically advanced. Today, the use of artificial light in commercial fishing plays a very important role in contributing to the total catch yield and economy of many industr ...
carbon nitrogen ratio; detritivores; ecosystems; functional diversity; natural regeneration; soil; species richness; trees; tropical forests; vegetation structure; Brazil
Abstract:
... Restoration projects may have broad and complex ecological goals that require distinct and integrative measures for evaluating restoration development and success. However, most studies usually evaluate structural and species composition parameters, with less emphasis on ecological processes and functioning. The main objective of this study is to use an integrated approach that considers structura ...
Ligustrum sinense; arthropods; bags; floodplains; forests; humidity; macroinvertebrates; microclimate; predators; temperature; Southeastern United States
Abstract:
... The litter bag method has been used to study litter breakdown for over 50 years but remains a criticized technique. One major criticism is the effect of mesh enclosures, specifically the use of two or more mesh sizes to evaluate the role of arthropods, on litter breakdown. We aimed to evaluate the effectiveness of a new basket-style mesh enclosure in mitigating microclimatic mesh effects while sti ...
Berberis; breeding; climate change; climatic factors; cluster analysis; dormancy; firmness; flowering; fruit growing; fruit trees; genetic variation; genotype; germplasm; harvest date; leaf length; leaf width; leaves; new variety; ripening; small fruits; tree growth; vegetative growth; vigor; Iran
Abstract:
... One of the methods for breeding of fruit trees is the identification and selection of superior genotypes in different regions. Owing to climate changes in the recent years and the urgent need to changing the pattern of cultivation, it is essential to use adapted species to climatic conditions. Barberry is one of the plants that have been naturally grown in some areas of Isfahan province. For acces ...
... Iran is one of the main diversity centers and origins of pistachios in the world. Pistachio cultivation spread first within the ancient Persian Empire and then moved gradually westward. Knowledge of the genetic relationships among wild and cultivated varieties of pistachio is important for the efficient utilization of the available germplasm resources. Three molecular marker strategies, namely, in ...
Bacillus subtilis; Ctenopharyngodon idella; Hydrogenophaga; Pseudomonas stutzeri; Rhodobacter; biomarkers; fish culture; microbiome; microorganisms; nitrogen; nitrogen compounds; water quality
Abstract:
... The current study was designed to evaluate the effects of bacterial complexes (BC, a combination of Bacillus subtilis SC02 and Pseudomonas stutzeri F1M) on nitrogen removal and microbial composition in grass carp culture water. The results of the study showed that the addition of BC could significantly decrease the level of harmful nitrogen compounds and improve the water quality in grass carp cul ...
... Induction of interferons during viral infection is mediated by cellular proteins that recognise viral nucleic acids. MDA5 is one such sensor of virus presence and is activated by RNA. MDA5 is required for immunity against several classes of viruses, including picornaviruses. Recent work showed that mutations in the IFIH1 gene, encoding MDA5, lead to interferon-driven autoinflammatory diseases. Tog ...
... Sea cage farming of Asian seabass is a prospective aquaculture activity in India. Reports from India on betanodavirus-induced mortality in marine fish culture are not many. An outbreak of viral encephalopathy and retinopathy associated with red-spotted grouper nervous necrosis virus (RGNNV) genotype of betanodavirus in Asian seabass juveniles reared in indoor tanks and sea cages is described in th ...
... It would be possible to elucidate an ambiguity associated with the “silica-enthalpy mixing models” geothermometric technique, provided that an independent estimate was obtained concerning the enthalpy and the dissolved SiO₂ content of the hot end-member involved in a mixture between two liquid-phase groundwaters. This would allow one to ascertain whether or not, prior to mixing with the cold paren ...
... Previous studies have shown clearly that the deposit feeding polychaete, Hediste diversicolor, can promote oxygenation of sediments exposed to excess loads of mussel faeces. In this experimental study, we explicitly test their utility as food for H. diversicolor to survive and grow on. Furthermore, in order to understand the consequences of experimental manipulations, we also evaluated effects on ...
... Massive gravel excavation is one of the most destructive forces affecting riverine habitats in Europe. However, gravel pit lakes are also recognized as valuable wildlife refuge areas. Different hydromorphological characteristics of gravel pits may influence aquatic biota differently. Optimal selection of gravel excavation procedures may create favorable conditions for ecosystem diversity. The aim ...
bacterial communities; biofilm; biomarkers; colorectal neoplasms; digestive system diseases; digestive tract mucosa; human health; pathogens
Abstract:
... Bacterial communities are known to impact human health and disease. Mixed species biofilms, mostly pathogenic in nature, have been observed in dental and gastric infections as well as in intestinal diseases, chronic gut wounds and colon cancer. Apart from the appendix, the presence of thick polymicrobial biofilms in the healthy gut mucosa is still debated. Polymicrobial biofilms containing potenti ...
... Fluorescent amino acid analogs have proven to be useful tools for studying the dynamics of peptidoglycan metabolism. García-Heredia and colleagues showed that their route of incorporation differs depending on the adjunct fluorophore and applied this property to investigate mycobacterial peptidoglycan synthesis and remodeling with heightened granularity. ...
... OBJECTIVE: To identify under‐represented groups in a medical school intake. DESIGN: Descriptive analysis of student demographic characteristics. SETTING: One state‐wide medical school. PARTICIPANTS: All students enrolled between 2010 and 2016. MAIN OUTCOME MEASURE(S): Proportion of students from regional and rural areas, state versus independent schools, highest parental qualification, Aboriginal ...
... CCM111 is an aqueous extract of Antrodia cinnamomea (AC) that has exhibited anti-liver fibrosis functions. However, the detailed mechanisms of AC action against liver fibrosis have not been elucidated yet. The present research showed that CCM111 significantly lowered the levels of the hepatic enzyme markers glutamate oxaloacetate transaminase (GOT) and glutamic pyruvic transaminase (GPT), prevente ...
... Testing vaccine efficacy against the highly lethal Ebola virus (EBOV) in humans is almost impossible due to obvious ethical reasons and the sporadic nature of outbreaks. For such situations, the ‘animal rule’ was established, requiring the product be tested in animal models, expected to predict the response observed in humans. For vaccines, this testing aims to identify immune correlates of protec ...
... The use of β-lactam antibiotics to treat infections caused by Staphylococcus aureus has been severely compromised by the acquisition by horizontal gene transfer of a gene that encodes the β-lactam-insensitive penicillin-binding protein PBP2a. This allows methicillin-resistant S. aureus (MRSA) to proliferate in the presence of β-lactam antibiotics. Paradoxically the dependence on PBP2a for the esse ...
... Low‐light environments in early‐successional forests that have established after abandonment of farming often restrict the establishment of later successional species resulting in an arrested succession. This 6‐year study tested the potential of different canopy manipulations to facilitate the establishment of a light‐demanding canopy tree species, tōtara (Podocarpus totara), within a regenerating ...
Auchenorrhyncha; Pipunculidae; biological pest control; endoparasitoids; geographical distribution; Egypt
Abstract:
... The family Pipunculidae has a potential value for biological pest control, as most pipunculid species are endoparasitoids of the hemipteran suborder Auchenorrhyncha. In the present study, all known Egyptian taxa of the family Pipunculidae (big-headed flies) are systematically catalogued. Old World synonymies, type localities, world distributions by biogeographic realm(s) and country, Egyptian loca ...
... Acacia catechu L., (Fabaceae) named as “catechu” is a plant, the decoction of heartwood of which is daily consumed as thirst quencher by a good percentage of the population in South India. The plant is mainly distributed in India and other Asian countries. It has been used in Indian traditional medicine for the treatment of asthma, bronchitis, colic, diarrhea, boils, skin afflictions, sores and st ...
Actinobacteria; bacteria; beta-cyclodextrin; calcium; chemical oxygen demand; composting; composts; enzyme activity; fungi; green waste; humic substances; magnesium; microbial carbon; nitrogen; phosphorus; polygalacturonase; potassium; seeds; sodium; toxicity; water content; xylanases
Abstract:
... This research determined whether addition of β-cyclodextrin (β-CD; 0, 0.15, or 0.25%) improved the two-stage composting of green waste (GW). The following parameters were measured during composting or in the final product: moisture content; volume; biochemical and chemical oxygen demand; humic substances; C/Nₛₒₗᵢd and C/Nₛₒₗᵤbₗₑ; microbial numbers (culturable bacteria, actinomycetes, and fungi); e ...
... The advection-dispersion equation, ADE, has commonly been used to describe solute transport in fractured rock. However, there is one key question that must be addressed before the mathematical form of the so-called Fickian dispersion that underlies the ADE takes on physical meaning in fractures. What is the required travel distance, or travel time, before the Fickian condition is met and the ADE b ...
3-hydroxybutyric acid; acetone; biodegradability; crystal structure; cyclohexanes; differential scanning calorimetry; endothermy; energy; gas chromatography; gel chromatography; glass; heat production; melting; molecular weight; polymers; solutes; solvents; sorption; temperature
Abstract:
... The surface thermodynamics of poly(3-hydroxybutyric acid) (PHBA) as a biodegradable polymer, was characterized using the inverse gas chromatography method. Gel permeation chromatography and differential scanning calorimetry method was also used to measure the molar mass, polydispersity, glass and melting temperatures. Twenty-seven solutes (solvents) with different families having a variety of chem ...
... The spatial distribution of hydraulic conductivity (K) in riverbeds is essential to understand and model river–groundwater interactions. However, K in riverbeds varies over several orders of magnitude and its spatial distribution is closely linked to complex geological and fluvial processes. Investigating the local distribution and spatial heterogeneity of K is therefore a challenging task. The us ...
... The origin of suspended matter and colloids in karst aquifers during storm events is not well understood in spite of their potentially important role in the transport of poorly soluble inorganic, organic, and microbiological pollutants. This work aims to characterize the fluxes of trace metals related to dissolved and suspended matter during a storm event at the spring of a karst aquifer in the Ju ...
Fourier transform infrared spectroscopy; X-ray diffraction; adsorbents; adsorption; cation exchange; cations; chitosan; composite polymers; energy-dispersive X-ray analysis; fabrics; gelatin; heavy metals; industrial effluents; ion exchange capacity; lead; metal ions; methylene blue; models; nanocomposites; pH; remediation; scanning electron microscopy; temperature; thermal stability; tin; titration; toxicity; transmission electron microscopy
Abstract:
... The present study reported the synthesis of novel organic–inorganic hybrid nanocomposite by incorporating tin (IV) based ion exchanger into the hybrid polymer network of chitosan and gelatin prepared under vacuum for the efficient removal of heavy metal ions and toxic dyes from an aqueous fluid. The physicochemical studies such as ion exchange capacity (IEC), chemical stability, thermal stability, ...
... Limited scientific information has been published on the application of tools in the geographic information system (GIS) environment to understand factors that influence groundwater recharge. The objectives of the research reported here were to understand the spatial variability of factors that influence groundwater recharge using GIS, and to estimate the amount of groundwater recharge and its spa ...
national parks; old-growth forests; seedlings; species diversity; tropical rain forests; understory; Uganda
Abstract:
... The status of woody seedling colonization gives clues about the self‐sustainability of restored forests, a tenet of restoration success. Little is known about woody seedling colonization in restored afrotropical forests. We evaluated effects of restoration methods (active vs. passive), sampling year, restoration age, and distance from old‐growth forests on seedling colonization in restored afrotro ...
chemical composition; heat; herbal medicines; mass spectrometry; neural networks; principal component analysis; ultra-performance liquid chromatography
Abstract:
... A strategy combining chemical UPLC-MS profiling and multivariate classification techniques has been used for the comparison of raw and processed Aconiti Lateralis Radix. UPLC-MS was used to identify 18 characteristic compounds, which were selected for discrimination of the raw and two processed products (Heishunpian and Baifupian). Chemometric analyses, including the combination of a heat map and ...
... Rice bran oil (RBO) has become a popular oil globally. However, the RBO extraction process leaves various residue products, which contain bioactive substances of varying potency which could be significant sources of functional ingredients for both food production and pharmaceutical manufacture. The objective of our study was to compare the bioactive substances in various by-products derived from t ...
air conditioning; alluvial plains; groundwater; groundwater flow; heat exchangers; heat pumps; hydrogeology; melting; oxygen; river water; rivers; roads; runoff; snow; stable isotopes; summer; winter; Japan
Abstract:
... The isotopic compositions (D and ¹⁸O) of 177 precipitation samples collected at seven observation stations in Toyama Prefecture and one station in Gifu Prefecture in the northern part of central Japan were determined. The source and characteristics of the isotopes were clarified and their contribution to the groundwater flow systems of three major alluvial fans in the same area were investigated. ...
... The original version of this article unfortunately contained a mistake. The spelling of the 3rd author’s name was incorrect. The correct spelling is given above. The publisher regrets this mistake. The original article has been corrected. ...