Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.875.177 [Categoria DeCS]
Referências encontradas : 5860 [refinar]
Mostrando: 1 .. 10   no formato [Longo]

página 1 de 586 ir para página                         

  1 / 5860 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29214539
Autor:Barroso PJ; Martín J; Santos JL; Aparicio I; Alonso E
Endereço:Department of Analytical Chemistry, Escuela Politécnica Superior, University of Seville, C/ Virgen de África 7, 41011, Seville, Spain.
Título:Analytical method for the evaluation of the outdoor air contamination by emerging pollutants using tree leaves as bioindicators.
Fonte:Anal Bioanal Chem; 410(2):417-428, 2018 Jan.
ISSN:1618-2650
País de publicação:Germany
Idioma:eng
Resumo:In this work, an analytical method, based on sonication-assisted extraction, clean-up by dispersive solid-phase extraction and determination by liquid chromatography-tandem mass spectrometry, has been developed and validated for the simultaneous determination of 15 emerging pollutants in leaves from four ornamental tree species. Target compounds include perfluorinated organic compounds, plasticizers, surfactants, brominated flame retardant, and preservatives. The method was optimized using Box-Behnken statistical experimental design with response surface methodology and validated in terms of recovery, accuracy, precision, and method detection and quantification limits. Quantification of target compounds was carried out using matrix-matched calibration curves. The highest recoveries were achieved for the perfluorinated organic compounds (mean values up to 87%) and preservatives (up to 88%). The lowest recoveries were achieved for plasticizers (51%) and brominated flame retardant (63%). Method detection and quantification limits were in the ranges 0.01-0.09 ng/g dry matter (dm) and 0.02-0.30 ng/g dm, respectively, for most of the target compounds. The method was successfully applied to the determination of the target compounds on leaves from four tree species used as urban ornamental trees (Citrus aurantium, Celtis australis, Platanus hispanica, and Jacaranda mimosifolia). Graphical abstract Analytical method for the biomonitorization of emerging pollutants in outdoor air.
Tipo de publicação: EVALUATION STUDIES; JOURNAL ARTICLE
Nome de substância:0 (Air Pollutants); 0 (Environmental Biomarkers); 0 (Flame Retardants); 0 (Fluorocarbons); 0 (Plasticizers); 0 (Surface-Active Agents)


  2 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Bracht, Adelar
Texto completo
PMID:29270996
Autor:Maldonado MR; Bracht L; de Sá-Nakanishi AB; Corrêa RCG; Comar JF; Peralta RM; Bracht A
Endereço:Department of Biochemistry, University of Maringá, Maringá, Brazil.
Título:Actions of p-synephrine on hepatic enzyme activities linked to carbohydrate metabolism and ATP levels in vivo and in the perfused rat liver.
Fonte:Cell Biochem Funct; 36(1):4-12, 2018 Jan.
ISSN:1099-0844
País de publicação:England
Idioma:eng
Resumo:p-Synephrine is one of the main active components of the fruit of Citrus aurantium (bitter orange). Extracts of the bitter orange and other preparations containing p-synephrine have been used worldwide to promote weight loss and for sports performance. The purpose of the study was to measure the action of p-synephrine on hepatic enzyme activities linked to carbohydrate and energy metabolism and the levels of adenine mononucleotides. Enzymes and adenine mononucleotides were measured in the isolated perfused rat liver and in vivo after oral administration of the drug (50 and 300 mg/kg) by using standard techniques. p-Synephrine increased the activity of glycogen phosphorylase in vivo and in the perfused liver. It decreased, however, the activities of pyruvate kinase and pyruvate dehydrogenase also in vivo and in the perfused liver. p-Synephrine increased the hepatic pools of adenosine diphosphate and adenosine triphosphate. Stimulation of glycogen phosphorylase is consistent with the reported increased glycogenolysis in the perfused liver and increased glycemia in rats. The decrease in the pyruvate dehydrogenase activity indicates that p-synephrine is potentially capable of inhibiting the transformation of carbohydrates into lipids. The capability of increasing the adenosine triphosphate-adenosine diphosphate pool indicates a beneficial effect of p-synephrine on the cellular energetics.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Pyruvate Dehydrogenase Complex); 8L70Q75FXE (Adenosine Triphosphate); EC 2.4.1.- (Glycogen Phosphorylase); EC 2.7.1.40 (Pyruvate Kinase); PEG5DP7434 (Synephrine)


  3 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29220441
Autor:Saha S; Hosmani PS; Villalobos-Ayala K; Miller S; Shippy T; Flores M; Rosendale A; Cordola C; Bell T; Mann H; DeAvila G; DeAvila D; Moore Z; Buller K; Ciolkevich K; Nandyal S; Mahoney R; Van Voorhis J; Dunlevy M; Farrow D; Hunter D; Morgan T; Shore K; Guzman V; Izsak A; Dixon DE; Cridge A; Cano L; Cao X; Jiang H; Leng N; Johnson S; Cantarel BL; Richards S; English A; Shatters RG; Childers C; Chen MJ; Hunter W; Cilia M; Mueller LA; Munoz-Torres M; Nelson D; Poelchau MF; Benoit JB; Wiersma-Koch H; D'Elia T; Brown SJ
Endereço:Boyce Thompson Institute, Ithaca, NY 14853.
Título:Improved annotation of the insect vector of citrus greening disease: biocuration by a diverse genomics community.
Fonte:Database (Oxford); 2017, 2017 Jan 01.
ISSN:1758-0463
País de publicação:England
Idioma:eng
Resumo:Database URL: https://citrusgreening.org/.
Tipo de publicação: JOURNAL ARTICLE


  4 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29220519
Autor:Pérez-Rodríguez J; Martínez-Blay V; Soto A; Selfa J; Monzó C; Urbaneja A; Tena A
Endereço:Unidad de Entomología IVIA-UJI, Centro de Protección Vegetal y Biotecnología, Instituto Valenciano de Investigaciones Agrarias (IVIA), Spain.
Título:Aggregation Patterns, Sampling Plan, and Economic Injury Levels for the New Citrus Pest Delottococcus aberiae (Hemiptera: Pseudococcidae).
Fonte:J Econ Entomol; 110(6):2699-2706, 2017 12 05.
ISSN:1938-291X
País de publicação:England
Idioma:eng
Resumo:Delottococcus aberiae De Lotto (Hemiptera: Pseudococcidae) is the latest exotic mealybug species introduced in citrus in the Mediterranean basin. It causes severe distortion and size reduction on developing fruits. Due to its first interaction with citrus, D. aberiae economic thresholds are still unknown for this crop and the current Integrated Pest Management programs have been disrupted. The objectives of this study were to determine the aggregation patterns of D. aberiae in citrus, develop an efficient sampling plan to assess its population density, and calculate its Economic and Economic Environmental Injury Levels (EIL and EEIL, respectively). Twelve and 19 orchards were sampled in 2014 and 2015, respectively. At each orchard, population densities were monitored fortnightly in leaves, twigs, and fruit, and fruit damage was determined at harvest. Our results showed a clumped aggregation of D. aberiae in all organs with no significant differences between generations on fruit. Fruit damage at harvest was strongly correlated with fruit occupation in spring. Based on these results and using chlorpyrifos as the insecticide of reference, the EIL and EEIL were calculated as 7.1 and 12.1% of occupied fruit in spring, respectively. With all this, we recommend sampling 275 fruits using a binomial sampling method or alternatively, 140 fruits with an enumerative method bimonthly between petal fall and July.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T


  5 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29328677
Autor:Suh JH; Niu YS; Wang Z; Gmitter FG; Wang Y
Título:Metabolic Analysis Reveals Altered Long-Chain Fatty Acid Metabolism in the Host by Huanglongbing Disease.
Fonte:J Agric Food Chem; 66(5):1296-1304, 2018 Feb 07.
ISSN:1520-5118
País de publicação:United States
Idioma:eng
Resumo:Candidatus Liberibacter asiaticus (CLas) is the presumed causal agent of Huanglongbing, one of the most destructive diseases in citrus. However, the lipid metabolism component of host response to this pathogen has not been investigated well. Here, metabolic profiling of a variety of long-chain fatty acids and their oxidation products was first performed to elucidate altered host metabolic responses of disease. Fatty acid signals were found to decrease obviously in response to disease regardless of cultivar. Several lipid oxidation products strongly correlated with those fatty acids were also consistently reduced in the diseased group. Using a series of statistical methods and metabolic pathway mapping, we found significant markers contributing to the pathological symptoms and identified their internal relationships and metabolic network. Our findings suggest that the infection of CLas may cause the altered metabolism of long-chain fatty acids, possibly leading to manipulation of the host's defense derived from fatty acids.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Fatty Acids)


  6 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29293649
Autor:Dutt M; Zambon FT; Erpen L; Soriano L; Grosser J
Endereço:Citrus Research and Education Center, University of Florida, Lake Alfred, Florida, United States of America.
Título:Embryo-specific expression of a visual reporter gene as a selection system for citrus transformation.
Fonte:PLoS One; 13(1):e0190413, 2018.
ISSN:1932-6203
País de publicação:United States
Idioma:eng
Resumo:The embryo-specific Dc3 gene promoter driving the VvMybA1 anthocyanin regulatory gene was used to develop a visual selection system for the genetic transformation of citrus. Agrobacterium-mediated transformation of cell suspension cultures resulted in the production of purple transgenic somatic embryos that could be easily separated from the green non-transgenic embryos. The somatic embryos produced phenotypically normal plants devoid of any visual purple coloration. These results were also confirmed using protoplast transformation. There was minimal gene expression in unstressed one-year-old transgenic lines. Cold and drought stress did not have any effect on gene expression, while exogenous ABA and NaCl application resulted in a minor change in gene expression in several transgenic lines. When gas exchange was measured in intact leaves, the transgenic lines were similar to controls under the same environment. Our results provide conclusive evidence for the utilization of a plant-derived, embryo-specific visual reporter system for the genetic transformation of citrus. Such a system could aid in the development of an all-plant, consumer-friendly GM citrus tree.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T


  7 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29304052
Autor:Cifuentes-Arenas JC; de Goes A; de Miranda MP; Beattie GAC; Lopes SA
Endereço:Departamento de Fitossanidade, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista 'Júlio de Mesquita Filho', Jaboticabal, São Paulo, Brazil.
Título:Citrus flush shoot ontogeny modulates biotic potential of Diaphorina citri.
Fonte:PLoS One; 13(1):e0190563, 2018.
ISSN:1932-6203
País de publicação:United States
Idioma:eng
Resumo:The biology and behaviour of the psyllid Diaphorina citri Kuwayama (Hemiptera: Sternorrhyncha: Liviidae), the major insect vector of bacteria associated with huanglongbing, have been extensively studied with respect to host preferences, thermal requirements, and responses to visual and chemical volatile stimuli. However, development of the psyllid in relation to the ontogeny of immature citrus flush growth has not been clearly defined or illustrated. Such information is important for determining the timing and frequency of measures used to minimize populations of the psyllid in orchards and spread of HLB. Our objective was to study how flush ontogeny influences the biotic potential of the psyllid. We divided citrus flush growth into six stages within four developmental phases: emergence (V1), development (V2 and V3), maturation (V4 and V5), and dormancy (V6). Diaphorina citri oviposition and nymph development were assessed on all flush stages in a temperature controlled room, and in a screen-house in which ambient temperatures varied. Our results show that biotic potential of Diaphorina citri is not a matter of the size or the age of the flushes (days after budbreak), but the developmental stage within its ontogeny. Females laid eggs on flush V1 to V5 only, with the time needed to commence oviposition increasing with the increasing in flush age. Stages V1, V2 and V3 were most suitable for oviposition, nymph survival and development, and adult emergence, which showed evidence of protandry. Flush shoots at emerging and developmental phases should be the focus of any chemical or biological control strategy to reduce the biotic potential of D. citri, to protect citrus tree from Liberibacter infection and to minimize HLB dissemination.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T


  8 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29256246
Autor:Ronningen IG; Peterson DG
Endereço:Department of Food Science, University of Minnesota , St. Paul, Minnesota 55108, United States.
Título:Identification of Aging-Associated Food Quality Changes in Citrus Products Using Untargeted Chemical Profiling.
Fonte:J Agric Food Chem; 66(3):682-688, 2018 Jan 24.
ISSN:1520-5118
País de publicação:United States
Idioma:eng
Resumo:Chemometric techniques have seen wide application in biological and medical sciences, but they are still developing in the food sciences. This study illustrated the use of untargeted LC/MS chemometric methods to identify features (retention time_m/z) associated with food quality changes as products age (freshness). Extracts of three citrus fruit varietals aged over four time points that corresponded to noted changes in sensory attributes were chemically profiled and modeled by two discriminatory multivariate statistical techniques, projection partial least-squares discrimant analysis (PLS-DA) and machine learning random forest (RF). Age-associated compounds across the citrus platform were identified. Varietal was treated as a nuisance variable to emphasize aging chemistry, and further variable selection using age-related piecewise model generation and meta filtering to emphasize features associated with general aging chemistry common to all the citrus extracts. The identified features were further replicated in a validation study to illustrate the validity and persistence of these markers for applications in citrus food platforms.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Plant Extracts)


  9 / 5860 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29237265
Autor:Feng S; Suh JH; Gmitter FG; Wang Y
Endereço:Department of Food Science and Human Nutrition, University of Florida , 572 Newell Drive, Gainesville, Florida 32611, United States.
Título:Differentiation between Flavors of Sweet Orange (Citrus sinensis) and Mandarin (Citrus reticulata).
Fonte:J Agric Food Chem; 66(1):203-211, 2018 Jan 10.
ISSN:1520-5118
País de publicação:United States
Idioma:eng
Resumo:Pioneering investigations referring to citrus flavor have been intensively conducted. However, the characteristic flavor difference between sweet orange and mandarin has not been defined. In this study, sensory analysis illustrated the crucial role of aroma in the differentiation between orange flavor and mandarin flavor. To study aroma, Valencia orange and LB8-9 mandarin were used. Their most aroma-active compounds were preliminarily identified by aroma extract dilution analysis (AEDA). Quantitation of key volatiles followed by calculation of odor activity values (OAVs) further detected potent components (OAV ≥ 1) impacting the overall aromatic profile of orange/mandarin. Follow-up aroma profile analysis revealed that ethyl butanoate, ethyl 2-methylbutanoate, octanal, decanal, and acetaldehyde were essential for orange-like aroma, whereas linalool, octanal, α-pinene, limonene, and (E,E)-2,4-decadienal were considered key components for mandarin-like aroma. Furthermore, an unreleased mandarin hybrid producing fruit with orange-like flavor was used to validate the identification of characteristic volatiles in orange-like aroma.
Tipo de publicação: COMPARATIVE STUDY; JOURNAL ARTICLE
Nome de substância:0 (Flavoring Agents); 0 (Volatile Organic Compounds)


  10 / 5860 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
PMID:29198099
Autor:Bauer A; Luetjohann J; Rohn S; Kuballa J; Jantzen E
Endereço:Research and Development Department, GALAB Laboratories GmbH , Am Schleusengraben 7, 21029 Hamburg, Germany.
Título:Determination of Fosetyl and Phosphonic Acid at 0.010 mg/kg Level by Ion Chromatography Tandem Mass Spectrometry.
Fonte:J Agric Food Chem; 66(1):346-350, 2018 Jan 10.
ISSN:1520-5118
País de publicação:United States
Idioma:eng
Resumo:A new sensitive, fast, and robust method using ion chromatography tandem mass spectrometry (IC-MS/MS) for the determination of fosetyl and phosphonic acid in plant-derived matrices was developed. For compensation of matrix effects and differences in recovery rates the isotopically labeled internal standard (ILIS) O -labeled phosphonic acid was added to the samples prior to the extraction of the target compounds. The validation of the method for the matrices tomato, apple, lemon, sultana, avocado, and wheat was performed according to the actual EU guidance document SANTE/11945/2015. The precision and accuracy were determined in five replicates at spiking levels of 0.010 and 0.100 mg/kg with recovery rates between 76 and 105% and RSDs between 1.2 and 17.8%. In this paper, it was achieved for the first time to detect both fosetyl and phosphonic acid at the reporting level of 0.010 mg/kg most relevant for organic plant food commodities.
Tipo de publicação: EVALUATION STUDIES; JOURNAL ARTICLE
Nome de substância:0 (Fungicides, Industrial); 0 (Phosphorous Acids); 13598-36-2 (phosphonic acid)



página 1 de 586 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde