The Experts below are selected from a list of 3099 Experts worldwide ranked by ideXlab platform
Anna Uhl Chamot - One of the best experts on this subject based on the ideXlab platform.
-
implementing the cognitive academic language learning approach Calla in arlington virginia
Bilingual Research Journal, 1995Co-Authors: Anna Uhl ChamotAbstract:Abstract This article describes the implementation of the Cognitive Academic Language Learning Approach (Calla), an instructional model that fosters the school achievement of students who are learning through the medium of a second language. Specifically, the Calla science and math programs for secondary English language learning (ELL) students in Arlington Public Schools are examined with respect to program goals, curriculum and materials development, teacher education, instruction, native language support, parent involvement, and assessment and evaluation. A critical assessment of the success of Calla's implementation is included.
-
the Calla handbook implementing the cognitive academic language learning approach
1994Co-Authors: Anna Uhl Chamot, Michael J OmalleyAbstract:Part One: Introducing Calla 1. What is Calla? Application Activities 2. The Content-Based Curriculum in Calla Application Activities 3. Academic Language Development in Calla Application Activities 4. Learning Strategy Instruction in Calla Application Activities Part Two: Establishing a Calla Program 5. Planning, Teaching, and Monitoring Calla Application Activities 6. Assessing Student Progress in Calla Application Activities 7. Calla Program Administration Application Activities 8. Calla in Different Contexts Application Activities Part Three: Implementing Calla in The Classroom 9. Calla Science Model Science Unit 10. Calla Mathematics Model Mathematics Unit 11. Calla Social Studies Model Social Studies Unit 12. Calla Literature and Composition Model Literature and Composition Unit Outline for an Integrated Calla Unit References Index
Iris Yedidia - One of the best experts on this subject based on the ideXlab platform.
-
priming of antimicrobial phenolics during induced resistance response towards pectobacterium carotovorum in the ornamental monocot Calla lily
Journal of Agricultural and Food Chemistry, 2007Co-Authors: T Luzzatto, A Golan, M Yishay, Itshak Bilkis, Julius Benari, Iris YedidiaAbstract:Calla lilies are herbaceous monocotyledonous plants that are highly sensitive to Pectobacterium carotovorum, the causal agent of soft-rot disease. Results demonstrate that, in response to elicitation using plant defense activators, the Calla lily produces elevated levels of antimicrobial phenolics and that these compounds contribute to increased resistance against P. carotovorum, as shown by reduced bacterial proliferation in elicited leaves. The polyphenolic nature of the induced compounds was supported by autofluorescence, absorbance spectra, and reaction with Folin−Ciocalteu reagent. Two plant defense activators, Bion and methyl jasmonate, differed in both their capacity to induce accumulation of polyphenols and their resistance against the pathogen. Methyl jasmonate elicitation brought about higher accumulation of free phenolics relative to Bion, suggesting priming of bioactive polyphenols as a principal factor in the Calla lily defense against P. carotovorum. To further characterize the nature of ind...
-
priming of antimicrobial phenolics during induced resistance response towards pectobacterium carotovorum in the ornamental monocot Calla lily
Journal of Agricultural and Food Chemistry, 2007Co-Authors: T Luzzatto, A Golan, M Yishay, Itshak Bilkis, Julius Benari, Iris YedidiaAbstract:Calla lilies are herbaceous monocotyledonous plants that are highly sensitive to Pectobacterium carotovorum, the causal agent of soft-rot disease. Results demonstrate that, in response to elicitation using plant defense activators, the Calla lily produces elevated levels of antimicrobial phenolics and that these compounds contribute to increased resistance against P. carotovorum, as shown by reduced bacterial proliferation in elicited leaves. The polyphenolic nature of the induced compounds was supported by autofluorescence, absorbance spectra, and reaction with Folin-Ciocalteu reagent. Two plant defense activators, Bion and methyl jasmonate, differed in both their capacity to induce accumulation of polyphenols and their resistance against the pathogen. Methyl jasmonate elicitation brought about higher accumulation of free phenolics relative to Bion, suggesting priming of bioactive polyphenols as a principal factor in the Calla lily defense against P. carotovorum. To further characterize the nature of induced compounds, two major compounds were collected and identified as swertisin and isovitexin by mass and nuclear magnetic resonance spectroscopies.
-
efficient long lasting resistance against the soft rot bacterium pectobacterium carotovorum in Calla lily provided by the plant activator methyl jasmonate
Plant Pathology, 2007Co-Authors: T Luzzatto, M Yishay, Alexander Lipsky, E Belausov, Iris YedidiaAbstract:The potential of three externally applied chemical plant activators, Bion, BABA and methyl jasmonate, known to act only through the plant defence system and not on the pathogen directly, to induce resistance against wild-type Pectobacterium carotovorum was examined in white-flowered Calla lily ( Zantedeschia aethiopica ). Following a 24-h induction period, plants were challenge-inoculated with P. carotovorum , originally isolated from Calla lily or potato plants, previously transformed using a gfp broad-host-range promoter-probe vector. After another 24 h, Bion treatment (10 µ g mL ‐1 , as a drench) reduced disease symptoms more than sixfold and bacterial proliferation by four orders of magnitude. BABA treatment (5‐10 µ g mL ‐1 , also as a drench) reduced the rate of infection by 75‐85%. However, the protection afforded by both inducers did not persist. Also, at higher concentrations both displayed a phytotoxic effect. By contrast, methyl jasmonate (10 m m , applied as a leaf spray) completely inhibited P. carotovorum development in Calla lily leaves and afforded a long-lasting effect. It is suggested that the defence response of Calla lily against P. carotovorum involves the SA-signalling pathway in the short term, but the jasmonate/ethylene-signalling pathway is required for durable protection.
T Luzzatto - One of the best experts on this subject based on the ideXlab platform.
-
priming of antimicrobial phenolics during induced resistance response towards pectobacterium carotovorum in the ornamental monocot Calla lily
Journal of Agricultural and Food Chemistry, 2007Co-Authors: T Luzzatto, A Golan, M Yishay, Itshak Bilkis, Julius Benari, Iris YedidiaAbstract:Calla lilies are herbaceous monocotyledonous plants that are highly sensitive to Pectobacterium carotovorum, the causal agent of soft-rot disease. Results demonstrate that, in response to elicitation using plant defense activators, the Calla lily produces elevated levels of antimicrobial phenolics and that these compounds contribute to increased resistance against P. carotovorum, as shown by reduced bacterial proliferation in elicited leaves. The polyphenolic nature of the induced compounds was supported by autofluorescence, absorbance spectra, and reaction with Folin−Ciocalteu reagent. Two plant defense activators, Bion and methyl jasmonate, differed in both their capacity to induce accumulation of polyphenols and their resistance against the pathogen. Methyl jasmonate elicitation brought about higher accumulation of free phenolics relative to Bion, suggesting priming of bioactive polyphenols as a principal factor in the Calla lily defense against P. carotovorum. To further characterize the nature of ind...
-
priming of antimicrobial phenolics during induced resistance response towards pectobacterium carotovorum in the ornamental monocot Calla lily
Journal of Agricultural and Food Chemistry, 2007Co-Authors: T Luzzatto, A Golan, M Yishay, Itshak Bilkis, Julius Benari, Iris YedidiaAbstract:Calla lilies are herbaceous monocotyledonous plants that are highly sensitive to Pectobacterium carotovorum, the causal agent of soft-rot disease. Results demonstrate that, in response to elicitation using plant defense activators, the Calla lily produces elevated levels of antimicrobial phenolics and that these compounds contribute to increased resistance against P. carotovorum, as shown by reduced bacterial proliferation in elicited leaves. The polyphenolic nature of the induced compounds was supported by autofluorescence, absorbance spectra, and reaction with Folin-Ciocalteu reagent. Two plant defense activators, Bion and methyl jasmonate, differed in both their capacity to induce accumulation of polyphenols and their resistance against the pathogen. Methyl jasmonate elicitation brought about higher accumulation of free phenolics relative to Bion, suggesting priming of bioactive polyphenols as a principal factor in the Calla lily defense against P. carotovorum. To further characterize the nature of induced compounds, two major compounds were collected and identified as swertisin and isovitexin by mass and nuclear magnetic resonance spectroscopies.
-
efficient long lasting resistance against the soft rot bacterium pectobacterium carotovorum in Calla lily provided by the plant activator methyl jasmonate
Plant Pathology, 2007Co-Authors: T Luzzatto, M Yishay, Alexander Lipsky, E Belausov, Iris YedidiaAbstract:The potential of three externally applied chemical plant activators, Bion, BABA and methyl jasmonate, known to act only through the plant defence system and not on the pathogen directly, to induce resistance against wild-type Pectobacterium carotovorum was examined in white-flowered Calla lily ( Zantedeschia aethiopica ). Following a 24-h induction period, plants were challenge-inoculated with P. carotovorum , originally isolated from Calla lily or potato plants, previously transformed using a gfp broad-host-range promoter-probe vector. After another 24 h, Bion treatment (10 µ g mL ‐1 , as a drench) reduced disease symptoms more than sixfold and bacterial proliferation by four orders of magnitude. BABA treatment (5‐10 µ g mL ‐1 , also as a drench) reduced the rate of infection by 75‐85%. However, the protection afforded by both inducers did not persist. Also, at higher concentrations both displayed a phytotoxic effect. By contrast, methyl jasmonate (10 m m , applied as a leaf spray) completely inhibited P. carotovorum development in Calla lily leaves and afforded a long-lasting effect. It is suggested that the defence response of Calla lily against P. carotovorum involves the SA-signalling pathway in the short term, but the jasmonate/ethylene-signalling pathway is required for durable protection.
Malgorzata Waleron - One of the best experts on this subject based on the ideXlab platform.
-
Pectobacterium zantedeschiae sp. nov. a new species of a soft rot pathogen isolated from Calla lily (Zantedeschia spp.).
Systematic and Applied Microbiology, 2018Co-Authors: Malgorzata Waleron, Agnieszka Misztak, Martyna Franczuk, Joanna Jońca, Artur Mikiciński, Tatjana Popović, Bartosz Wielgomas, Krzysztof WaleronAbstract:Abstract Four Gram-negative, rod-shaped pectinolytic bacterial strains designated as 2M, 9M, DPMP599 and DPMP600 were subjected to polyphasic analyses that revealed their distinctiveness from the other Pectobacterium species. Strains 2M and 9M were isolated from Calla lily bulbs cultivated in Central Poland. DPMP599 and DPMP600 strains were isolated from Calla lily leaves from plants grown in Serbia. Phylogenetic analyses based on nine housekeeping genes (gapA, gyrA, icdA, pgi, proA, recA, recN, rpoA, and rpoS), as well as phylogeny based on the 381 most conserved universal proteins confirmed that Pectobacterium zantedeschiae strains were distantly related to the other Pectobacterium, and indicated Pectobacterium atrosepticum, Pectobacterium betavasculorum, Pectobacterium parmentieri and Pectobacterium wasabiae as the closest relatives. Moreover, the analysis revealed that Pectobacterium zantedeschiae strains are not akin to Pectobacterium aroidearum strains, which were likewise isolated from Calla lily. The genome sequencing of the strains 2M, 9M and DPMP600 and their comparison with whole genome sequences of other Pectobacterium type strains confirmed their distinctiveness and separate species status within the genus based on parameters of in silico DNA–DNA hybridization and average nucleotide identity (ANI) values. The MALDI-TOF MS proteomic profile supported the proposition of delineation of the P. zantedeschiae and additionally confirmed the individuality of the studied strains. Based on of all of these data, it is proposed that the strains 2M, 9M, DPMP599, and DPMP600 isolated from Calla lily, previously assigned as P. atrosepticum should be reclassified as Pectobacterium zantedeschiae sp. nov. with the strain 9MT (PCM2893 = DSM105717 = IFB9009) as the type strain.
Yichung Chang - One of the best experts on this subject based on the ideXlab platform.
-
first report of bacterial soft rot of white flowered Calla lily caused by erwinia chrysanthemi in taiwan
Plant Disease, 2002Co-Authors: Y A Lee, K P Chen, Yichung ChangAbstract:In 2002, soft rot symptoms on white flowered Calla lily (Zantedeschia aethiopica) were found in some nurseries in the Yang Ming Shan area, Taipei, Taiwan. The disease was characterized by foul smelling rot and collapse of flower stems. Isolations from diseased flower stems consistently yielded bacterial colonies that were translucent, white, and glistening on nutrient agar. Ten representative isolates were chosen for further characterization. All isolates were gram-negative rods, facultatively anaerobic, sensitive to erythromycin (25 μg/ml), negative for oxidase and arginine dihydrolase, and positive for catalase, phosphatase, tryptophanase (indole production), and lecithinase. They fermented glucose and reduced nitrates to nitrites. The maximum temperature for growth was 37°C. The isolates hydrolyzed gelatin and esculin, produced acids from utilizing D(+)-glucose, melibiose, amygdalin, L(+)-arabinose, D-mannitol, and sucrose, but not from trehalose, lactose, D-sorbitol, or maltose. They degraded pectate and rotted potato, carrot, sweet pepper, and onion slices. Bacterial suspensions (108 CFU/ml) were injected in stems of white flowered Calla lily to fulfill Koch's postulates. Control plants were inoculated with sterile distilled water. Inoculated plants were kept in a growth chamber at 30°C. Symptoms developed 1 to 2 days in all four inoculated plants and appeared to be identical to those observed on diseased material in nurseries. The four control plants did not rot. The bacterium was readily reisolated from diseased plants, confirmed to be the inoculated pathogen, and identified as Erwinia chrysanthemi. E. carotovora subsp. carotovora has been reported to cause soft rot of other Calla lilies, such as Zantedeschia sp. cvs. Black Magic and Pink Persuasion and Z. elliottiana in Taiwan (1). However, to our knowledge, this is the first report of soft rot caused by E. chrysanthemi on white flowered Calla lily in Taiwan. Reference: (1) S. T. Hsu and K. C. Tzeng. Pages 9-18 in: Proc. Int. Conf. Plant Path. Bact., 5th. J. C. Lozano, ed. CIAT, Cali, Colombia, 1981.
