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Wyszukujesz frazę "Umana, E. J." wg kryterium: Autor

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    Tytuł:
    Phytochemical and Antifungal Activity of Leaf Extracts of Corchorus olitorius and Gongronema latifolium on Fungi Associated with Post-Harvest Deterioration of Maize (Zea mays) Seeds in Oban Community, Nigeria
    Autorzy:
    Akwaji, P. I.
    Umana, E. J.
    Okon, E. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182869.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    phytochemical
    antifungal
    extracts
    maize
    fungi
    Opis:
    This study was carried out to investigate the fungal pathogens associated with post-harvest deterioration of maize seeds in storage in Oban community, Cross River State, Nigeria, determine the effect of the pathogens on the nutritional content of the maize seeds through biochemical analysis as well as evaluate the phytochemical contents and antifungal activity of ethanolic leaf extracts of Corchorus olitorius and Gongronema latifolium in controlling the isolated fungi in vitro. The fungal pathogens isolated as the causative agents of post-harvest deterioration of maize seeds in this study were Penicillium sp., Fusarium sp., Aspergillus sp., and Rhizopus stolonifer. The result of biochemical analysis of fungal infected and non-infected maize seeds carried out showed a significant increase (P ≤ 0.05) in the moisture content of the fungal infected maize seeds as compared to healthy ones (control), while there was a significant decrease (P ≤ 0.05) in the crude fibre, fat, ash, protein and carbohydrate contents of the fungal infected maize seeds as compared to the healthy ones (control). For the in vitro antifungal assay, various concentrations of the extracts ranging from 20g/200ml, 40g/200 ml, 60g/200 ml, 80g/200 ml and 100g/200 ml were separately added to PDA media. Results shows that at 60g/200 ml and 80g/200 ml and 100g/200 ml concentrations, ethanolic leaf extracts of C. olitorius completely inhibited the radial growth of Penicillium sp., Fusarium sp., Aspergillus sp., and R. stolonifer after seven days observation period while those of ethanolic extracts of G. latifolium completely inhibited the redial growth of the fungal pathogens at 40g/200 ml, 60g/200 ml, 80g/200 ml and 100g/200 ml concentrations. Results, however, shows that the extracts had a significant effect (P ≤ 0.05) on the radial growth of the fungal pathogens at all the different concentrations tested as compared with the control. Phytochemical screening of the extracts revealed the presence of cardiac glycosides, reducing sugars, flavonoids, saponnins, tannins, hydocyanin, and anthraquinones with traces of alkaloids.
    Źródło:
    World Scientific News; 2016, 53, 3; 157-177
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mushroom Biodiversity of Cross River National Park (Oban Hills Division), Nigeria
    Autorzy:
    Markson, A. A.
    Akwaji, P. I.
    Umana, E. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182808.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cross River National Park
    Mushroom
    Nigeria
    Oban Hills
    Survey
    Opis:
    Cross River National Park lies between, latitude 5° 05′ and 6° 29′ N and on longitude 8° 15′ and 9° 30′ E., in the South-Eastern corner of Nigeria, in Cross River State. It covers an area of about 4,000sq. km of primary tropical moist rainforest ecosystem in the south and central parts, and montane mosaic on the Obudu Plateau. It is an important ecological gene-pool containing one of the oldest rainforest in Africa. It lies in the Guineo-Congolian rainforest refugia with close canopy and scattered emergent trees which reach a height of between 40 and 50 metres. The vegetation is studied to have evolved over 60 million years. On account of its critical conservation status it has been designated as one of the 25 United Nations biodiversity hotspots in the world. Cross River National Park have two distinct, non-contagious Divisions: Oban and Okwango. Survey of wild mushrooms occurring in the park (Oban Hills Division) was carried out between the months of April to September in 2015 and 2016 respectively. A total of 80 species of mushroom belonging to 40 families and 55 genera were identified using their macro-morphological features. The identified species and varieties spread over in the following genera viz., Agaricus, Agrocybe, Aleuria, Amanita, Arachnopeziza, Armillaria, Armillariella, Ascocoryne, Atroumbonata, Auricularia, Betula, Bisporella, Boletus, Bonderzewia, Cantharellus, Cerrena, Clitocybe, Coenocybe, Collybia,Coltricia, Coprinellus, Coprinus, Cortinarius, Craterellus, Crepidotus, Cystoderma, Daedaleopsis, Entoloma, Exidia, Fomes, Fomitopsis, Galerina, Ganoderma, Gloeophyllum, Gymnopus, Gyromitra, Hebeloma, Helvella, Hydrochaete, Hygrocybe, Inocybe, Laccaria, Lentinus, Lepiota, Marasmus, Mycena, Omphalotus, Peziza, Pleurotus, Psathyrella, Schizophyllum,Scutellinia, Tapinella, Tramates and Tyromyces. This study therefore shows that the Cross River National Park (Oban Hills Division) is home to a variety of wild mushrooms.
    Źródło:
    World Scientific News; 2017, 65; 59-80
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioremediation of spent engine oil contaminated soil by using fungus, Penicillium sp
    Autorzy:
    Umana, E.J.
    Akwaji, P.I.
    Markson, A.A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/10944.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2016, 59
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of green rot fungus of Arachis hypogaea L. in orage using plant extracts
    Autorzy:
    Umana, E.J.
    Akwaji, P.I.
    Ekpenyong, E.M.
    Hanson, P.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/11117.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The antifungal activity of the ethanolic and aqueous fruit extracts of Zingiber officinale, Tetrapleura tetraptera, Garcinia kola and Cola nitida on the green rot fungus (Penicillium sp.) isolated from infected groundnut (Arachis hypogaea) seeds in storage were investigated in vitro. Various concentrations of the aqueous and ethanolic fruit extract ranging from 5g/100ml, 10g/100ml, and 15g/100ml were separately added to Potato Dextrose Agar (PDA) media. The fungus was inoculated into the media and incubated for seven days. Results of the in vitro studies showed that the ethanolic extracts had a significant inhibitory effect (p<0.05) on the radial growth of Penicillium sp. at all levels of concentration tested. Complete inhibition of the fungus was at 15g/100ml of ethanolic extracts of Garcinia kola and Tetrapleura tetraptera. The aqueous extracts showed less inhibitory effect as compared to the ethanolic extracts. The effective inhibition of ethanolic extracts as compared to the aqueous extracts may be attributed to the efficiency of the extraction solvent on the phytochemical content of the plant extracts. The application of botanical extracts for disease management could be less expensive, easily available, non-polluting and ecofriendly. The ethanolic fruit extracts of Garcinia kola and Tetrapleura tetraptera at the higher concentrations can be produced in large quantities and used as spray in controlling the green rot fungus of Arachis hypogaea in storage.
    Źródło:
    International Letters of Natural Sciences; 2016, 58
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In vitro control of tomato (Solanum lycopersicon L.) fruit rot caused by fungi using two plant extracts
    Autorzy:
    Okey, E.N.
    Akwaji, P.I.
    Akpan, J.B.
    Umana, E.J.
    Bassey, G.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11144.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The inhibitory properties of the ethanolic and methanolic leaf extracts of Vernonia amygdalina and Cola acuminata on the fungal pathogens isolated from infected tomato fruits were investigated. The pathogens were Fusarium moniliformes and Rhizopus stolonifer. Various concentrations of the extracts ranging from 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100% were separately added to PDA media. The fungal pathogens were separately inoculated into the media and incubated for seven days. Antifungal effects of these extracts on the mycelia growth of the pathogens were significant at P<0.05 for all treatments at higher concentrations. At 10-50% concentration, ethanolic and methanolic extracts of Vernonia amygdalina and Cola acuminata had no significant effect on the mycelia growth of Fusarium moniliformes and Rhizopus stolonifer after seven days observation period. At 60-100% concentrations, the two pathogens were completely inhibited by ethanolic extracts of Vernonia amygdalina and Cola acuminata. Methanolic extracts of Vernonia amygdalina and Cola acuminata inhibited completely Fusarium moniliformes and Rhizopus stolonifer at 80-100% concentrations. The in vitro inhibitory effects of these extracts at higher concentrations indicated that they can be used for the control of tomato fruit rot. It may be necessary to use them in prolonging the shelf-life of fresh tomato fruit and some other fruits.
    Źródło:
    International Letters of Natural Sciences; 2016, 52
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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