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Mattana Efisio Peguero Brígido Di Sacco Alice Agramonte Wilvin Encarnación Castillo Wilkin Rafael Jiménez Francisco Clase Teodoro Pritchard Hugh W. Gómez-Barreiro Pablo Castillo-Lorenzo Elena Terrero Encarnación Marianny Way Michael J. García Ricardo Ulian Tiziana 《New Forests》2020,51(4):705-721
New Forests - Native trees from the Caribbean were tested for seed desiccation responses, by adapting the “100-seed test” protocol. Ninety-seven seed lots of 91 species were collected... 相似文献
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Maia Tsikolia Ulrich R. Bernier Monique R. Coy Katelyn C. Chalaire James J. Becnel Natasha M. Agramonte Nurhayat Tabanca David E. Wedge Gary G. Clark Kenneth J. Linthicum Daniel R. Swale Jeffrey R. Bloomquist 《Pesticide biochemistry and physiology》2013
Twenty trifluoromethylphenyl amides were synthesized and evaluated as fungicides and as mosquito toxicants and repellents. Against Aedes aegypti larvae, N-(2,6-dichloro-4-(trifluoromethyl)phenyl)-3,5-dinitrobenzamide (1e) was the most toxic compound (24 h LC50 1940 nM), while against adults N-(2,6-dichloro-4-(trifluoromethyl)phenyl)-2,2,2-trifluoroacetamide (1c) was most active (24 h LD50 19.182 nM, 0.5 μL/insect). However, the 24 h LC50 and LD50 values of fipronil against Ae. aegypti larvae and adults were significantly lower: 13.55 nM and 0.787 × 10−4 nM, respectively. Compound 1c was also active against Drosophila melanogaster adults with 24 h LC50 values of 5.6 and 4.9 μg/cm2 for the Oregon-R and 1675 strains, respectively. Fipronil had LC50 values of 0.004 and 0.017 μg/cm2 against the two strains of D. melanogaster, respectively. In repellency bioassays against female Ae. aegypti, 2,2,2-trifluoro-N-(2-(trifluoromethyl)phenyl)acetamide (4c) had the highest repellent potency with a minimum effective dosage (MED) of 0.039 μmol/cm2 compared to DEET (MED of 0.091 μmol/cm2). Compound N-(2-(trifluoromethyl)phenyl)hexanamide (4a) had an MED of 0.091 μmol/cm2 which was comparable to DEET. Compound 4c was the most potent fungicide against Phomopsis obscurans. Several trends were discerned between the structural configuration of these molecules and the effect of structural changes on toxicity and repellency. Para- or meta- trifluoromethylphenyl amides with an aromatic ring attached to the carbonyl carbon showed higher toxicity against Ae. aegypti larvae, than ortho- trifluoromethylphenyl amides. Ortho- trifluoromethylphenyl amides with trifluoromethyl or alkyl group attached to the carbonyl carbon produced higher repellent activity against female Ae. aegypti and Anopheles albimanus than meta- or para- trifluoromethylphenyl amides. The presence of 2,6-dichloro- substitution on the phenyl ring of the amide had an influence on larvicidal and repellent activity of para- trifluoromethylphenyl amides. 相似文献
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Britta Kowalski Felipe Jimenez Terry Lidcay Herrera Daniel Agramonte Peñalver 《Potato Research》2006,49(3):167-176
The aim of this work was to investigate whether the application of soluble chitosan in potato micropropagation can improve
microplant quality in vitro, help acclimatisation ex vitro, and increase yield and seed quality of minitubers. Potato cv.
Désirée microplants were treated in vitro with soluble chitosan added to the semisolid tissue culture medium in different
concentrations. Microplants were subsequently transferred to the greenhouse and sprayed with chitosan solutions or remained
unsprayed. Untreated microplants were also established ex vitro and sprayed with chitosan, or left unsprayed as a control.
Morphological and physiological parameters of plant growth were assessed in vitro and ex vitro. Plantlet quality was evaluated
using a ranking system. Minitubers derived from greenhouse plantlets were planted in the field in subtropical conditions,
and growth and yield parameters evaluated. The chitosan concentration most beneficial to the in vitro growth of microplants
varied between years. In treatments with the best in vitro growth, minituber number and yield in the greenhouse was also increased.
Foliar chitosan application at the acclimatisation phase stabilised the effect of in vitro treatment on yield parameters.
The seed quality of minitubers derived from chitosan treatments in vitro alone and in combination with foliar treatment at
acclimatisation was improved, giving rise to field plants with increased tuber numbers and yields. The combination of chitosan
in vitro and foliar application during the acclimatisation phase ex vitro had a greater effect on minituber seed quality than
the concentration applied in vitro. 相似文献
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