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.
African Americans; agricultural land; ancestry; case studies; extension agents; farmers; sharecropping; teachers; United States
Abstract:
... The oppressive histories of slavery, sharecropping, and discriminatory lending practices contribute to a modern American agricultural landscape where black farmers are underrepresented. While African Americans once made up 14% of the United States’ farmer population, today they only make up 1.4%. Moreover, the American farmer population overall is aging, and currently only 6% of farmers are under ...
case studies; fisheries; models; population dynamics; population structure
Abstract:
... Understanding population dynamics is essential for achieving sustainable and productive fisheries. However, estimating recruitment in a stock assessment model involves the challenging task of identifying a self-sustaining population, which often includes representing complex geographic structure. A review of several case studies demonstrated that alternative stock assessment models can influence e ...
... Despite their generally negative attitude toward food waste, consumers often pursue goals that can inhibit their intention to reduce food waste. Identifying these goals that inhibit consumers’ intention to reduce food waste is essential for the development of successful public policy and retail approaches designed to curb or reduce household food waste. First, we conducted semi-structured qualitat ...
... The new lichen association, Verrucario viridulae-Staurotheletum hymenogoniae (Aspicilion contortae Roux 2009, Aspicilietalia calcareae Roux 2009, Verrucarietea nigrescentis Wirth 1980) is described here. It is formed on marl limestone pebbles in arid landscapes in the Northern Black Sea lowland. Forty-six species of lichens and ten lichenicolous fungi were observed and Staurothele hymenogonia, Ver ...
... Although the organic production concept is characterised by an efficient and environmentally sound production that is based on a few off-farm inputs as well as recycling organically grown products. Organic products are often perceived as safer and more promotive to consumers' health as compared to products from conventional or integrated production systems. However, from a hygienic point of view, ...
I López-Goñi; J Giner-Lamia; A Álvarez-Ordoñez; Alfonso Benitez-Páez; D Claessen; M Cortesao; M de Toro; D García-Ruano; E T Granato; Á T Kovács; J L Romalde; T G Sana; M Sánchez-Angulo; F J Sangari; W K Smits; T Sturm; J L Thomassin; K N G Valdehuesa; M Zapotoczna
educational materials; microbiology; online courses; social networks
Abstract:
... Twitter is one of the most popular social media networks that, in recent years, has been increasingly used by researchers as a platform to share science and discuss ongoing work. Despite its popularity, Twitter is not commonly used as a medium to teach science. Here, we summarize the results of #EUROmicroMOOC: the first worldwide Microbiology Massive Open Online Course taught in English using Twit ...
alternative medicine; analysis of covariance; clinical trials; heart rate; inventories; mental health; pain; quality of life; questionnaires; women; yoga; New Zealand
Abstract:
... BACKGROUND: The neurobiology of persistent pain shares common underlying psychobiology with that of traumatic stress. Modern treatments for traumatic stress often involve bottom-up sensorimotor retraining/exposure therapies, where breath, movement, balance and mindfulness, are used to target underlying psychobiology. Vigorous exercise, in particular Bikram yoga, combines many of these sensorimotor ...
... ‘BRS Vitória’ is a seedless table grape released by the grape breeding program of EMBRAPA in 2012. It has attracted great interest from grape growers because of the high fertility of its buds, its exotic and pleasant taste and its tolerance to downy mildew (Plasmopara viticola). The aim of this study was to characterize the agronomic and productive behavior of the grape ‘BRS Vitória’ under the tro ...
Botryosphaeria dothidea; Diplocarpon; Malus domestica; air; apples; disease resistance; fruit growing; fruit quality; fruits; fungal diseases of plants; leaves; oxidation; plant pathogenic fungi; taste; trees; China
Abstract:
... A good new late-ripening apple ‘Changping 8’ was raised at the Changli Institute of Pomology (China) in 2014. It was derived from a cross between ‘Iwafu 10’ and ‘Sakata Tsugaru’ in 1993. It is a moderately vigorous upright spreading tree that produces spurs freely. The cropping is good and picking time is late October. The fruits are middle-large in size with an attractive appearance. Its flesh is ...
... The production of citrus seedlings in Santa Catarina State has grown in the last few years. However, the process of seedlings production needs adjustment in order to optimize the system to get genetic material with high phytotechnical standard that allows greater profitability to the farmer. The objective of the present study is to evaluate the effect of different substrates and the removal of teg ...
... Polyfurfuryl alcohol (PFA) is a biobased thermoset like matrix with high thermal performances and cork powder or cork granules are side stream product from cork stoppers’ production . They were processed together via compression molding. Structural investigations were made by means of FT-IR and thermo-mechanical measurements were performed using tensile tests, thermogravimetric analyses (TGA) and ...
... Geoarchaeological research at the archaeological site of Mǎgura Gorgana should elucidate the environmental setting Neolithic and Copper Age communities were faced with, when they settled along the Lower Danube Valley, Romania. This should enable a better understanding of human-environment interactions, the natural preconditions of a trading network, as well as the living conditions of the human po ...
Prunus persica; agronomic traits; antioxidant activity; breeding programs; chlorophyll; clones; cultivation area; demonstration farms; flavor; flowering date; fruit growing; fruit quality; fruit weight; fruiting; fruits; leaf characteristics; leaves; magnesium oxide; orchards; peaches; phenols; propagation materials; ripening; seedlings; shoots; specific leaf weight; taste; titratable acidity; total soluble solids; trees; viruses; Greece
Abstract:
... The ‘Lemonato’ peach is a series of clones cultivated in Magnesia, central Greece. These clones were selected locally from seedling populations characterized by different time of ripening and different fruit quality traits. The fruit are phenotypically discriminated from the other peach cultivars, as they have typical yellow skin colour when ripe, very little red hue and unique flavor and taste. T ...
2,2-diphenyl-1-picrylhydrazyl; antioxidant activity; ascorbic acid; ethylene; ethylene production; fruit maturity; fruits; harvest date; pears; scald diseases; storage time
Abstract:
... The interaction between ethylene, α-farnesene (AF), conjugated trienols (CTols) content and total antioxidant capacity (DPPH), depends on the maturity stage and affects superficial scald (SS) susceptibility. To evaluate the influence of fruit maturity at harvest on SS incidence in 'Packham's Triumph' pears, fruit were harvested on February 3 (H1); February 18 (H2) and March 3 (H3). Ethylene produc ...
... ‘Silistrenska ranna’ is a Bulgarian cultivar with an average fruit weight of 34 g, yellowish-orange skin color and gentle red over color. For improving its fruit quality, ‘Silistrenska ranna’ was used as a pollinator of ‘Lito’, a cultivar with attractive fruits and known as resistant to Plum Pox Virus (PPV). The inheritance of fruit weight, shape, skin ground color and over color, were observed. A ...
... A new endemic species from western Iran, Teucrium elymaiticum Attar, Sotoodeh & Mirtadzadini, spec. nova is described. It belongs to section Scordium. Considering the combination of some characteristics like indumentum, bracts, pedicel, calyx, corolla size, and nutlet shape and size, the new species is related to T. scordium subsp. scordioides (Schreb.) Arcang.. The differences between these two s ...
... (±)-Eurotone A [(±)-1], a pair of new enantiomeric polyketide dimers, as well as six known biogenetically related polyketides (2-7) were isolated from a marine-derived fungus Eurotium sp. SCSIO F452. Their structures were determined by comprehensive spectroscopic methods, X-ray diffraction and quantum chemical calculations. Compound 1 represented the first pair of spiro-dihydrobenzanthracene enant ...
Alternaria; X-ray diffraction; enantiomers; endophytes; fungi; moieties; nuclear magnetic resonance spectroscopy; probability analysis; quantum mechanics; risk
Abstract:
... The enantiomers (+)- and (−)-alternarilactone A (1), the first examples of dibenzo-α-pyrones bearing a diepoxy-cage-like moiety, were isolated from the endophytic fungus Alternaria sp. hh930. The deficiency in ¹H–¹H COSY and HMBC correlations caused by the highly oxidized caged system of 1 and the deceptive and ambiguous signals such as “W” couplings in NMR data increased the risk of structure mis ...
... A pair of enantiomeric norsesquiterpenoids, (+)- and (−)-preuisolactone A (1) [(+)-1 and (−)-1)] featuring an unprecedented tricyclo[4.4.0¹,⁶.0²,⁸]decane carbon scaffold were isolated from Preussia isomera. Their structures were determined by spectroscopic and computed methods and X-ray crystallography. Compounds (+)-1 and (−)-1 are two rare naturally occurring sesquiterpenoidal enantiomers. A pla ...
... In order to study the in vitro effect of flavan-3-ol (+)-catechin on the enzymatic activities of mitochondrial complex I and nitric oxide synthase (mtNOS), as well as the consequences on the membrane potential and H₂O₂ production rate, isolated mitochondria from rat heart were exposed to 3 nM to 100 μM (+)-catechin. NADH–Q₁ reductase (complex I) and mtNOS activities were inhibited 25% and 50%, res ...
... (+)-Catechin is a versatile compound with its pharmacophore (catechol and resorcinol) responsible for prooxidant and antibacterial activities. In this study, we present that demonstrating the synergistic interaction between (+)-catechin and quinolone-based antibiotics, ciprofloxacin and gemifloxacin is related to reactive oxygen species generation. The minimum inhibitory concentration of (+)-catec ...
... Depression is a mood disorder that is related to neuroinflammation and cognition loss. This study is aimed to determine the potential antidepressant effects of (+)-sesamin, a lignan component of sesame, in a mild stress-induced depression mouse model. CD-1 mice were treated with chronic unpredictable mild stress (CUMS) process and orally administrated with sesamin (50 mg/kg/d) for 6 weeks. Behavio ...
... Cardiac fibrosis contributes to both systolic and diastolic dysfunction in many cardiac pathophysiologic conditions. Antifibrotic therapies are likely to be a crucial strategy in curbing many fibrosis‐related cardiac diseases. In our previous study, an ethyl acetate extract of a traditional Chinese medicine Aristolochia yunnanensis Franch. was found to have a therapeutic effect on myocardial fibro ...
Ganoderma lucidum; X-ray diffraction; amino acids; biochemical pathways; chemical reactions; chemical structure; meroterpenoids
Abstract:
... (±)-Lucidumone (1), an enantiomeric meroterpenoid possessing an unprecedented skeleton comprising a fused 6/5/6/6/5 polycyclic system, was isolated from Ganoderma lucidum and structurally identified. The absolute configuration of (−)-1 was assigned by single-crystal X-ray crystallography. A plausible biosynthetic pathway for 1 is proposed. A chemical biology approach reveals that (−)-1 selectively ...
Porifera; alkaloids; cytotoxicity; human cell lines; imidazole; inhibitory concentration 50; liquid chromatography; neoplasm cells; nuclear magnetic resonance spectroscopy; spectral analysis
Abstract:
... LC-DAD/MS-based dereplication of organic extract of a calcareous sponge Leucetta chagosensis afforded one new chiral aminoimidazole-containing alkaloid, (-)-calcaridine B (1), along with one achiral imidazole analog leucettamine E (2) as well as one known imidazole derivative (2E, 9E)-pyronaamidine-9-(N-methylimine) (3). Their structures were elucidated on the basis of NMR spectroscopic analyses, ...
... (-)-Epigallocatechin-3-gallate (EGCG), the major phenolic compound of green tea, and hydroxytyrosol (HTyr), a phenol found in olive oil, have received attention due to their wide-ranging health benefits. To date, there are no studies that report their effect in bovine mammary gland. Therefore, the aim of this study was to evaluate the anti-oxidative and anti-inflammatory effects of EGCG and HTyr i ...
... Cigarette smoking is the leading cause for the initiation and development of cardiovascular disease (CVD). Oxidative stress and inflammatory responses play important roles in the pathophysiological processes of smoking-induced cardiac injury. (-)-epigallocatechin-3-gallate (EGCG), the most abundant catechin in green tea, which is made from Camellia sinensis leaves, has been reported to possess pot ...
... The quality of meat products is influenced by protein oxidation. Understanding the effects of antioxidant polyphenols and oxidizing lipoperoxides on myofibrillar proteins is essential for controlling the quality of meat products. This study was designed to investigate the epigallocatechin-3-gallate (EGCG)-mediated formation of myofibrillar protein emulsion gels under malondialdehyde (MDA)-induced ...
... Sodium-ion capacitors (SICs) have shown great potential to combine the merits of high-power capability of traditional capacitors and high energy capability of batteries. However, the sluggish kinetics and inferior stability of conventional sodium-ion storage anode materials are major challenges for the practical utilization of SICs. In this work, interconnected urchin-like hollow Na₂Ti₃O₇ (Na₂Ti₃O ...
... In this study, the (1→3)-β-D-glucan was isolated from yeast cell wall for investigating its effect on reducing the postharvest decay of pear fruit caused by Penicillium expansum and the underlying mechanisms. The results demonstrated that (1→3)-β-D-glucan could significantly induce disease resistance against P. expansum in pear wounds. (1→3)-β-D-glucan did not directly affect the growth of P. expa ...
chemical structure; high performance liquid chromatography; hydrolysates; mass spectrometry; organic chemistry; oxidation; oxygen; singlet oxygen; stable isotopes; uric acid
Abstract:
... Previously, we identified that parabanic acid (PA) and its hydrolysate, oxaluric acid (OUA), are the singlet oxygen-specific oxidation products of uric acid (UA). In this study, we investigated the PA formation mechanism by using HPLC and a time-of-flight mass spectrometry technique and identified unknown intermediates as (2,5-dioxoimidazolidin-4-ylidene)aminocarbonylcarbamic acid (DIAA), dehydroa ...
Citrus; arsenic; cytotoxicity; enzyme inhibitors; epithelial cells; genes; human diseases; lungs; mitogen-activated protein kinase; oxidative stress; pathogenesis; phosphatidylinositol 3-kinase; polymethoxyflavones; protein kinase C; sodium; toxic substances; ubiquitination
Abstract:
... Exogenous toxicants (e.g. arsenic, cigarette smoke), trigger oxidative stress, and initiate the pathogenesis of many human diseases. Induction of nuclear factor E2-related factor 2 (Nrf2) counteract exogenous toxicant-induced oxidative insults. Using a high-throughput screen, we firstly identified a citrus polymethoxyflavone, (2S)-5,6,7,3',4'-pentamethoxyflavanone (PMF), to be an Nrf2 activator, a ...
ambient temperature; chemical reactions; chemical structure; imines; pyrazoles
Abstract:
... The Brønsted base promoted (3 + 1) annulation reaction of C,N-cyclic azomethine imines and 3-chlorooxindoles was investigated, finally delivering complex hexahydroindeno[2,1-c] pyrazoles incorporating a spirocyclic oxindole motif after an unexpected rearrangement process. The asymmetric version of this new transformation could be accomplished, but slow racemization of the chiral product was observ ...
... Three-dimensional (3D)-chromatin organization is critical for proper enhancer-promoter communication and, therefore, for a precise execution of the transcriptional programs governing cellular processes. The emergence of Chromosome Conformation Capture (3C) methods, in particular Hi-C, has allowed the investigation of chromatin interactions on a genome-wide scale, revealing the existence of overlap ...
Termitidae; abdomen; alcohols; antennae; eggs; enantiomers; headspace analysis; hemolymph; long term experiments; reproduction; sesquiterpenoids; social insects; tissues
Abstract:
... The queens of advanced social insects maintain their reproductive monopoly by using exocrine chemicals. The chemistry of these “queen pheromones” in termites is poorly known. We show that primary queens of four higher termites from the subfamily Syntermitinae (Embiratermes neotenicus, Silvestritermes heyeri, Labiotermes labralis, and Cyrilliotermes angulariceps) emit significant amounts of the ses ...
... BACKGROUND: Organophosphorus pesticides (OP’s) are heavily constituted in agriculture, gardens, home and veterinary and although it is useful, there are concerns about the environment, safety and health of human and animals. In this study, we investigated the effects of a new oxime, (3Z)-5-Chloro-3-(Hydroxyimino)indolin-2-one (OXIME) against the alterations induced by malathion, an OP insecticide, ...
Lewis acids; catalytic activity; chemical reactions; diastereoselectivity; moieties; organic compounds; stereospecificity
Abstract:
... A general approach is described for the formation of tetrahydrothiepines using donor–acceptor cyclopropanes. Thiochalcones, functioning as sulfur-containing four-atom building blocks, were reacted in a Lewis acid catalyzed formal (4 + 3)-cycloaddition reaction with donor–acceptor cyclopropanes as three-atom building blocks. Under mild conditions various tetrahydrothiepines were synthesized in good ...
Marie-Hélène Tremblay; Félix Thouin; Johannes Leisen; John Bacsa; Ajay Ram Srimath Kandada; Justin M. Hoffman; Mercouri G. Kanatzidis; Aditya D. Mohite; Carlos Silva; Stephen Barlow; Seth R. Marder
... (4NPEA)₂PbI₄ (4NPEA = 4-nitrophenylethylammonium) is the first 3 × 3 corrugated 2D organic-Pb/I perovskite. The nitro groups are involved in cation–cation and cation-iodide interactions. The structure contains both highly distorted and near-ideal PbI₆ octahedra, consistent with the observation of two ²⁰⁷Pb NMR resonances, while the optical properties resemble those of other 2D perovskites with dis ...
Fomitopsis; carbon; chemical reactions; energy; flavor; food chemistry; fungal culture; mass spectrometry; mushrooms; nuclear magnetic resonance spectroscopy; odors; pineapples
Abstract:
... During the cultivation of the edible mushroom Fomitopsis betulina on agro-industrial side streams, a pleasant flavor strongly reminiscent of pineapple was perceived. Aroma extract dilution analyses identified two flavor components with a distinct pineapple odor. On the basis of mass spectrometric data, a Wittig reaction of (E)-penta-2,4-dien-1-yltriphosphonium bromide with ethyl levulinate was con ...
... (5R)-5-hydroxytriptolide (LLDT-8) is a triptolide analog with excellent capability against cancers, cerebral ischemic injury and rheumatoid arthritis. Here, we discovered its hepatoprotective effects in a mouse model of non-alcoholic fatty liver disease (NAFLD) by ameliorating liver lipid accumulation.Male C57BL/6J mice were fed with a high-fat/high-fructose (HFHFr) diet for 29 weeks to induce the ...
acids; aldehydes; alkynes; amides; carbon-hydrogen bond activation; catalysts; catalytic activity; chemical reactions; chemical structure; ketones; olefin; organic chemistry; ruthenium; water solubility
Abstract:
... The synthetic chemists always look for developing new catalysts, sustainable catalysis, and their applications in various organic transformations. Herein, we report a new class of water-soluble complexes, (Ar-tpy)Ruᴵᴵ(ACN)₃, utilizing designed terpyridines possessing electron-donating and -withdrawing aromatic residues for tuning the catalytic activity of the Ru(II) complex. These complexes displa ...
... Transport of Ag(i), Cd(ii), Co(ii), Cu(ii), Ni(ii), Pb(ii) and Zn(ii) cations across a bulk liquid membrane (BLM) containing N,N′-dibenzyl-N′′-(2,2,2-trifluoroacetyl)-phosphoric triamide (PTC) as a new carrier is studied by atomic absorption spectrometry. The results show selective and efficient transport of the copper(ii) cation from aqueous solution in the presence of the other cations. Various ...
... Co-combustion performances, ashes, gases and thermodynamics were quantified for spent potlining (SPL) and textile dyeing sludge (TDS) (with)out CaO. During the four decomposition stages of the blends according to the (D)TG experiments, the interaction among Na, Ca, F, Al, and S led to CaAl2O4, CaF2, and Na2SO4 which converted inorganic compounds into ash. Increased comprehensive combustion index, ...
carbon dioxide; crosslinking; gelation; ionic liquids; liquids; methane; permeability; polymerization; polymers; process design; thin film composite membranes; ultrafiltration; zeolites
Abstract:
... A three-component (cross-linked poly(ionic liquid) (PIL)–ionic liquid (IL)–zeolite), mixed-matrix membrane (MMM) platform based on curable IL prepolymers of controlled length has been developed for separating CO₂ from CH₄. Solutions of these curable prepolymers demonstrate increased resistance to support penetration compared to comparable solutions of analogous cross-linkable IL monomers. By adjus ...
... Air-stable iron carbonyl compounds bearing cyclopentadienone ligands with varying substitution were explored as catalysts in dehydrogenative diol lactonization reactions using acetone as both the solvent and hydrogen acceptor. Two catalysts with trimethylsilyl groups in the 2- and 5-positions, [2,5-(SiMe₃)₂-3,4-(CH₂)₄(η⁴-C₄C═O)]Fe(CO)₃ (1) and [2,5-(SiMe₃)₂-3,4-(CH₂)₃(η⁴-C₄C═O)]Fe(CO)₃ (2), were f ...
Ilda P. Ribeiro; Joana M. Rodrigues; Alexandra Mascarenhas; Vanessa Marques; Francisco Caramelo; Maria J. Julião; Thomas Liehr; Joana B. Melo; Isabel M. Carreira
... BACKGROUND: Head and neck squamous cell carcinoma cell lines are useful preclinical models to understand the molecular processes underlying the development of such tumors, and to establish targeted therapies. OBJECTIVE: We performed a comprehensive (cyto)genomic and epigenetic characterization of three new established primary human head and neck squamous cell carcinoma cultures and an established, ...
... A key challenge in the eco-friendly optoelectronic materials field is to find highly stable and nontoxic perovskite materials. Here, we report the optoelectronic properties and stability of the (C₆H₅NH₃)BiI₄ perovskite material. Using an eco-friendly gas pump treatment technique, a dense and pinhole-free (C₆H₅NH₃)BiI₄ film was fabricated. Remarkably, a large-area (>20 cm²) Bi-based perovskite film ...
Aspergillus flavus; acetyl coenzyme A; adenosine triphosphate; antifungal agents; apoptosis; crops; energy metabolism; enzymes; food production; human health; leaves; mechanism of action; median effective concentration; microbial contamination; minimum inhibitory concentration; mitochondria; phosphatidylserines; propidium; protein content; pyruvic acid; scanning electron microscopy; spore germination; spores; staining
Abstract:
... Fungal contamination imposes threats to agriculture and food production and human health. A method to safely and effectively restrict fungal contamination is still needed. Here, we report the effect and mode of action of (E)-2-hexenal, one of the green leaf volatiles (GLVs), on the spore germination of Aspergillus flavus, which can contaminate a variety of crops. The EC₅₀ value, minimum inhibitory ...
... BACKGROUND: Pea aphid (Acyrthosiphon pisum Harris) is one of the major pests in alfalfa crops, causing significant yield losses. (E)‐β‐farnesene (EβF), an alarm pheromone released by pea aphid, is generic to many species of aphids, and is used to minimize potential danger from predators and parasitoids by avoiding the source of the pheromone. RESULTS: In this study, EβF synthase gene was construct ...
age structure; assets; issues and policy; land use change; landscapes; rural development; soil erosion; vineyards; wines; Iberian Peninsula; Spain
Abstract:
... Vineyards have assumed a key role as rural landmarks in recent decades. Investigating vineyard dynamics and contexts may reveal various economic, cultural, and environmental aspects of rural landscapes, which can be linked to land-use changes and major soil degradation processes, including soil erosion. As a contribution to rural landscape studies, the purpose of this work is to investigate the sp ...