Yazar "Abdullah M.I." seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Antimicrobial Activity of the Essential Oil and the Extracts of Kitaibelia balansae Species(Har Krishan Bhalla and Sons, 2017) Yildirim F.; Memis Y.; Ozturk A.; Caliskan Z.; Savran A.; Abdullah M.I.Essential oils and many components from medicinal plant extracts have been long known for their antimicrobial activity. Essential oils are natural products that are synthesized by the plant and stored in their cells. Essential oils or many of their constituents are in fact effective against a large variety of organisms they can be very well used as alternatives to synthetic chemicals. Kitaibelia balansae Boiss is the only Turkish representative of the genus Kitaibelia that is regularly used as cataplasm herb in traditionally Turkish medicine. In this work the essential oil of the flowers, stems and leaves of K.balansae species, collected from Konya (Turkey) were extracted both by hydro-distillation and Soxhlet and were investigated for their anti-microbial activity. The results showed good activity on the pathogenic microorganisms used. All extracts were analyzed by GC-MS. The antibacterial activities of all the extracts were examined against five Gram-negative, one Gram-positive bacteria and one pathogenic yeast by using disc diffusion method. The results showed the presence of manool, 8, 13-epoxy, 15, 16-dinorlab-12-ene, 8a; 13, 13; 17 depoxy-14, 15-bisnorlabdane and tetrahydroactinidiolide, labda-7,13,14-triene, cis and trans-methyldihydrojasmonate as well as other compounds. © 2017 Har Krishan Bhalla & Sons.Öğe Electrophilic substitution in indoles, part 20' Hammett correlations of the coupling of aryldiazonium tetrafluoroborates with indole and its 1-, 2- and 3-methyl derivatives(2003) Aldemir S.; Kahyaoglu H.; Abdullah M.I.Hammett plots for the coupling of a range of substituted aryldiazonium tetrafluoroborate salts in dry acetonitrile with indole and its 1-, 2- and 3-methyl derivatives gave linear relationships, with p values ca. of +2.60, +2.54, +2.40 and +3.60 respectively.Öğe Insecticidal activity of the Thymus, Veronica and Agrimonia's essential oils against the cabbage aphid, Brevicoryne brassicae(2008) Görür G.; Abdullah M.I.; Işik M.The insecticidal activities of essential oils obtained from each Thymus vulgaris, Veronica officinalis and Agrimonia eupatoria were investigated against the cabbage aphid, Brevicoryne brassicae (Homoptera: Aphididae) under laboratory conditions. All of the three tested essential oil had significantly reduced the daily fecundity of the cabbage aphid and caused higher mortality rates. In this study, essential oil extracted from T. vulgaris was found to be the most effective insecticide, as no adult apterous have managed to survive more than three days on the T. vulgaris oil that has been applied to the petri dishes. However, although, there was no dose-dependent significant effects of the three tested essential oils, there has been an important reduction in the reproduction potential when a 2 l dose of these oils has been applied. Exposure time to the applied essential oil had also an important effect, since daily fecundity of the cabbage aphid has generally decreased after 3 days in all of the treatments (except for control). The results obtained indicated that the three tested essential oils, particularly T. vulgaris oil that had the highest percentage of the monoterpene phenols; Thymol and Carvacrol, have had a great potential on cabbage aphid population control. © 2008 Akadémiai Kiadó.Öğe Toxicological effect of indole and its azo dye derivatives on some microorganisms under aerobic conditions(2006) Öztürk A.; Abdullah M.I.Azo dyes are ubiquitous commercial chemicals that present unique environmental problems. The azo dyes in particular can undergo natural anaerobic degradation to potentially carcinogenic amines. They pose a major problem for water-treatment plants downstream. One strategy to remidate polluted surface contaminants is to make use of the degradative capacity of bacteria rather than using destructive chemical reactions. Therefore, pathogenic and non-pathogenic microorganisms namely; Bacillus thuringiensis, Bacillus subtilis, Bacillus megaterium, Proteus vulgaris, Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli and Saccharomyces cerevisiae have been chosen and the toxicological effect of indole and its azo dye methyl derivatives on these microorganisms was studied under aerobic conditions. While these compounds have showed remarkable activity against B. megaterium, B. subtilis, B. thuringiensis and S. aureus, they did not exhibit any activity against P. vulgaris. However, indole acted as an inhibitor on all of these compounds specially the Gram negative bacterium P. aeruginosa. © 2005 Elsevier B.V. All rights reserved.
