Results 251 to 260 of about 250,341 (305)
Toxicity of aqueous extracts of Ilex paraguariensis A.St.‐Hil. about Euphorbia heterophylla L.
Pest Management Science, EarlyView.Aqueous extracts of Ilex paraguariensis A.St.‐Hil. strongly inhibit Euphorbia heterophylla L. germination and early seedling growth, but show mild phytotoxicity on mature plants, paradoxically promoting biomass via antioxidants. Abstract BACKGROUND The escalating challenge of herbicide‐resistant weeds, exemplified by Euphorbia heterophylla L.
Tamara Alberton da Silva +8 more
wiley +1 more source
Fendioxypyracil, a new and systemic PPO‐inhibiting herbicide for X‐spectrum weed control
Pest Management Science, EarlyView.This graphical abstract presents the discovery and synthesis of PPO herbicide structures with a central pyridine core, showing molecular conformations, dose–response inhibition curves for PPO1 and PPO2, and comparative weed and grass control efficacy of fendioxypyracil versus other herbicides in greenhouse and field trials.
Tobias Seiser +8 more
wiley +1 more source
Pest Management Science, EarlyView.Metabolism‐based atrazine‐resistant Amaranthus tuberculatus populations ACR and MCR exhibit little or no cross‐resistance to amicarbazone and metribuzin, suggesting that non‐halogenated Group 5 herbicides can be utilized to re‐establish effective control.
Alexander J Lopez +5 more
wiley +1 more source
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Remote Sensing of Environment, 1998
Abstract Algorithms based on reflectance band ratios have been developed for the remote estimation of chlorophyll a , chlorophyll b , chlorophyll a+b , and total carotenoid content of Eucalyptus leaves. Reflectance spectra over the 400–2500 nm range with a spectral resolution of 2 nm and the content of chlorophylls a , b , a+b , and total ...
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Abstract Algorithms based on reflectance band ratios have been developed for the remote estimation of chlorophyll a , chlorophyll b , chlorophyll a+b , and total carotenoid content of Eucalyptus leaves. Reflectance spectra over the 400–2500 nm range with a spectral resolution of 2 nm and the content of chlorophylls a , b , a+b , and total ...
openaire +3 more sources
Water content of chlorophyll hydrate
Analytical Biochemistry, 1981Abstract Thermogravimetry shows that polycrystalline chlorophyll a is a chlorophyll dihydrate. Neither thermogravimetry nor differential thermal analysis indicates the existence of a stable chl a monohydrate. Moreover it is found that larger amounts of water-free chlorophyll a (>50 mg) cannot be prepared by application of vacuum and heat in a ...
H, Blaha, P, Kis, H, Springer-Lederer
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Chlorophyll Content of Grain Sorghums
Botanical Gazette, 19331. The chlorophyll content in kafir, based upon weekly determinations, increases generally to the stage of seed maturity in the plant. It begins to decrease as the grain hardens. The chlorophyll content varies directly with the amount of evaporation and with the temperature. 2.
J. C. Ireland, Parks A. Yeats
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Chlorophyll Content, Chlorophyll Fluorescence and Water Deficit in Spring Wheat
Cereal Research Communications, 2001Using greenhouse techniques that nearly-simulate field water deficit would be a supplemental method for screening potential cultivars adapted to water deficit environments. The objective of this study was to determine if there were differential responses to water deficit in chlorophyll content and chlorophyll fluorescence, and determine the drought ...
J. M. Nyachiro +3 more
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Photosynthesis Research, 1988
A practical microcomputerized video image analysis method is described for quantifying leaf chlorophyll content without extraction. Chlorophyll concentration is estimated from densimetric measurements of whole, intact leaves. Direct comparison with conventional extraction measurements on Epipremnum aureum, a variegated species, verified the image ...
L A, Spomer, M A, Smith, J S, Sawwan
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A practical microcomputerized video image analysis method is described for quantifying leaf chlorophyll content without extraction. Chlorophyll concentration is estimated from densimetric measurements of whole, intact leaves. Direct comparison with conventional extraction measurements on Epipremnum aureum, a variegated species, verified the image ...
L A, Spomer, M A, Smith, J S, Sawwan
openaire +2 more sources
The chlorophyll fluorescence ratio F690/F730 in leaves of different chlorophyll content
Photosynthesis Research, 1990The red laser-induced chlorophyll-fluorescence induction kinetics of predarkened leaf samples were registered simultaneously in the 690 and 730 nm regions i.e., in the region of the two chlorophyll fluorescence emission maxima. From the induction kinetics the chlorophyll fluorescence ratio F690/F730 was calculated.
H K, Lichtenthaler, R, Hak, U, Rinderle
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2013
Ever since the first Earth-observing satellite was launched, it became the dream of oceanographers to measure ocean chlorophyll a from space. Through more than a decade of dedicated theoretical, laboratory, and field research, the Coastal Zone Color Scanner was launched onboard NASA’s Nimbus-7 satellite in 1978.
Hu, Chuanmin, Campbell, Janet
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Ever since the first Earth-observing satellite was launched, it became the dream of oceanographers to measure ocean chlorophyll a from space. Through more than a decade of dedicated theoretical, laboratory, and field research, the Coastal Zone Color Scanner was launched onboard NASA’s Nimbus-7 satellite in 1978.
Hu, Chuanmin, Campbell, Janet
openaire +2 more sources