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1

Antimicrobial effect of crude extracts of Nigella sativa on multiple antibiotics-resistant bacteria

100%
Morsi N. M.
Acta Microbiologica Polonica
|
2000
|
tom 49
|
nr 1
2
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Antimicrobial effects of Citrus sinensis peel extracts against periodontopathic bacteria: an in vitro study

72%
Hussain K. A., Tarakji B., Kandy B. P. P., John J., Mathews J., Ramphul V., Divakar D. D.
Roczniki Państwowego Zakładu Higieny
|
2015
|
tom 66
|
nr 2
Background. Use of plant extracts and phytochemicals with known antimicrobial properties may have great significance in therapeutic treatments. Objective. To assess the in vitro antimicrobial potential and also determine the minimum inhibitory concentration (MIC) of Citrus sinensis peel extracts with a view of searching a novel extract as a remedy for periodontal pathogens. Materials and Methods. Aqueous and ethanol (cold and hot) extracts prepared from peel of Citrus sinensis were screened for in vitro antimicrobial activity against Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis and Prevotella intermedia, using agar well diffusion method. The lowest concentration of every extract considered as the minimal inhibitory concentration (MIC) values were determined for both test organisms. Confidence level and level of significance were set at 95% and 5% respectively. Results. Prevotella intermedia and Porphyromonas gingivalis were resistant to aqueous extracts while Aggregatibacter actinomycetemcomitans was inhibited at very high cncentrations. Hot ethanolic extracts showed significantly higher zone of inhibition than cold ethanolic extract. Minimum inhibitory concentration of hot and cold ethanolic extracts of Citrus sinensis peel ranged between 12-15 mg/ml against all three periodontal pathogens. Conclusions. Both extracts were found sensitive and contain compounds with therapeutic potential. Nevertheless, clinical trials on the effect of these plants are essential before advocating large-scale therapy.
3

Antimicrobiological effects of extracts from Cornelian-cherry (Cornus mas L.) is related to the flavonoids contents and blood antioxidant properties

72%
Krosniak M., Francik R., Krzysciak W., Berkoz M., Krzysciak P., Bystrowska B., Ochonska D., Kryczyk J.
Polish Journal of Food and Nutrition Sciences
|
2011
|
tom 61
|
nr Suppl.1
4
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Antimicrobial and antiprotozoal effect of sweet marjoram (Origanum majorana L.)

72%
Kozlowska M., Laudy A. E., Starosciak B. J., Napiorkowski A., Chomicz L., Kazimierczuk Z.
Acta Scientiarum Polonorum. Hortorum Cultus
|
2010
|
tom 09
|
nr 4
The objective of the present study that has been carried out in the Institute of Chemistry, Warsaw University of Life Sciences, was to investigate antimicrobial activity of a number of sweet marjoram extracts. Raw (fresh or dried) plant material from culinary or medicinal herbs may contain varying amounts of bacteria or protozoa, including some known human pathogens. The isolates, which are prepared by procedures involving the use of elevated temperature and/or organic solvents or other chemicals are expected to have considerably less or no such potentially harmful burden. Four sweet marjoram (Origanum majorana L.) fractions obtained by steam distillation, Soxhlet n-hexane extraction, extraction with aqueous ethanol, and with ethanolic ammonia solution were evaluated in vitro for activity against twenty Gram-positive or Gram-negative bacterial strains, six Candida sp. yeast strains and a single protozoan species Pentatrichomonas hominis. The n-hexane extract showed the highest antibacterial activity and inhibited growth of eight out of nine Staphylococcus aureus strains used. The other bacteria showed no substantial susceptibility to the extracts, except that Acinetobacter baumannii showed some inhibition by the aqueous ethanol extract. The isolates were also active against three out of six Candida sp. strains used, and the ethanolic ammonia extract reduced the number of viable P. hominis trophozoites by 50% at 160 µg·ml-1 concentration in 24 h cultures; the remaining extracts were considerably less or but marginally effective. These data warrant further study on identifying the components of the extracts with the highest activities.
5

Production of tannase through submerged fermentation of tannin-containing plant extracts by Bacillus licheniformis KBR6

58%
Das M. P. K., Mondal K. C., Pati B. R.
Polish Journal of Microbiology
|
2006
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tom 55
|
nr 4
Tannins are water-soluble polyphenolic compounds found in plants as secondary metabolites. The presence of these substances in the barks of eight different plants was initially examined and their crude extracts were used separately as a substrate for production of tannase through submerged fermentation by Bacillus licheniformis KBR6. Tannase production as well as biodégradation of the substrate reached a maximum within 15 to 18 h against crude tannin extract obtained from Anacardium occidentale. Among different concentrations of the crude tannin tested, 0.5% (w/v) induced maximum synthesis of enzyme. Tannase production was higher by almost two-fold in the presence of crude tannin compared to pure tannic acid used as a substrate. It seems that industrial production of tannase, using bark extract of A. occidentale can be a very simple and suitable alternative to presently used procedures.
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Effect of oscillating magnetic field pulses on the survival of selected microorganisms

58%
Lipiec J., Janas P., Barabasz W.
International Agrophysics
|
2004
|
tom 18
|
nr 4
7
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Effect of acetylsalicylic acid and chlormethine on the minimum inhibitory concentration of antibiotics for organisms causing mastitis in cows

44%
Malinowski E.
Bulletin of the Veterinary Institute in Puławy
|
1993
|
tom 37
|
nr 2
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