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Abstract

The aim of this study was to investigate the antimycobacterial activity of 39 free terpenes and their activity in combination with streptomycin. Antimicrobial activity was first evaluated by screening 39 free terpenes at concentrations from 1.56 to 400 μg/mL. None of these exhibited positive effects against any of the nontuberculous mycobacteria (NTM) strains tested. However, six of the 39 terpenes (isoeugenol, nerol, (+)-α-terpineol, (1R)-(−)-myrtenol, (+)-terpinen-4-ol, and eugenol) were shown to enhance the activity of streptomycin against the NTM strains isolated from diseased ornamental fish.
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Bibliography

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Authors and Affiliations

L. Guz
1
K. Puk
1
D. Szwajgier
2
A. Pastuszka
1

  1. Department of Biology and Fish Diseases, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Akademicka 12, 20-033 Lublin, Poland
  2. Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, Poland
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Abstract

The process of plant selection by insects is mediated by repellents and attractants. Several compounds may be involved in this interaction. Thus intraspecific variation of the compounds concentration play an important role in the herbivory. The best tool for the characteristic of this variation is chemometrics. The strategy of the analysis with the use of literature data on terpen es and sesquiterpenes variations in Pin us caribaea needles in relation to Atta laevigata herbivory is exemplified herein. Simple cluster analysis and principal components analysis were used for the data study. Two factors were found lo be sufficient to describe total variation in more than 90%. Factor I is responsible for repellent properties. From factor loading, the relevant chemical compounds were identified.
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Authors and Affiliations

Janusz Szafranek
Jan Nawrot
Beata Szafranek
Edmund Maliński
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Abstract

The main pathogen that deteriorates the quality of rose flowers during the postharvest stage belongs to the fungal genus Botrytis. The chemical products used to control the disease caused by this pathogen have been losing effectiveness due to the appearance of resistance. The present study describes the in vitro and in vivo fungicidal activity of Pelargonium graveolens essential oil and its chemical composition. The essential oil was obtained by hydrodistillation, and the in vitro fungicidal activity was determined by agar diffusion assays, showing 100% of fungal growth inhibition at 250 ppm. In vivo assays were performed on Rosa grandiflora flowers treated with 250 ppm of P. graveolens essential oil, using distillate water as a positive control and the commercial fungicide carbendazim as a negative one. No significant differences were obtained between the treatment with the essential oil and the treatment with the commercial fungicide. The chemical profile of the essential oil was determined by GC-MS. The main compounds detected were geraniol (24.89%), citronellol (19.50%), linalool (10.92%) and γ-eudesmol (8.93%). These results encourage the possible use of P. graveolens essential oil for the control of B. cinerea in rose flowers.
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Authors and Affiliations

María Inés Stegmayer
1
ORCID: ORCID
Norma Hortensia Álvarez
1 2
ORCID: ORCID
Néstor Gaspar Sager
2
ORCID: ORCID
Marcela Alejandra Buyatti
2
ORCID: ORCID
Marcos Gabriel Derita
1 3
ORCID: ORCID

  1. Producción y Protección Vegetal, ICiAgro Litoral, UNL, CONICET, FCA, Argentina
  2. Cultivos Intensivos, Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Santa Fe, Argentina
  3. Farmacognosia, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina

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