Evaluation of antimicrobial activity of some mosses from Turkey

Dulger B. | Hacioglu N. | Uyar G.

Makale | 2009 | Asian Journal of Chemistry21 ( 5 ) , pp.4093 - 4096

Ethanolic extracts obtained from S Byrophyte species (Platyhypnidium riparioides (Hedw.) Dixon, Anomodon viticulosis (Hedw.) Hook & Taylor, Polytrichostrumformosum (Hedw.) G.L.Sm., Plasteurhynchium meridionale (Schimp.) M. Reish. and Ctenidium molluscum (Hedw.) Mitt, were tested against Bacillus cereus, Bacillus subtilis, Micrococcus luteus, Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Enterobacter aerogenes, Proteus vulgaris, Proteus mirabilis, Pseudomonas aeruginosa, Pseudomonas putida. Salmonella typhimurium, Salmonella typhi, Neisseria gonorhoeae, Candida albicans, Rhodotorula rubra, Kluyveromyces fragili . . .s, Kluyveromyces marxianus and Debaryomyces hansenii by disc diffusion method. The extracts of the plants especially P. meridionale and A. viticulosis were active on all tested microorganisms Daha fazlası Daha az

Synthesis and antimicrobial activities of some transition metal benzimidazole complexes

Küçükbay H. | Günal S. | Orhan E. | Durmaz R.

Makale | 2010 | Asian Journal of Chemistry22 ( 9 ) , pp.7376 - 7382

The interaction of N-monosubstituted benzimidazoles with various metal salts [CoCl2, NiCl2 and Zn(OAc)2)] were yielded stable solid metal benzimidazole complexes. All the metal complexes were identified by 1H NMR, FT-IR spectroscopic techniques, elemental analysis and screened for their in vitro antimicrobial activities against the standard strains: Enterococcus faecalis (ATCC 29212), Staphylococcus aureus (ATCC 29213), Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853) and yeasts Candida albicans and Candida tropicalis. Some of the compounds inhibited the growth of grampositive bacteria (E. faecalis and S. aureus) a . . .t MIC values between 200 and 800 µg/mL. None of the compounds exhibit antimicrobial activity against gram-negative bacteria (E. coli and P. aeruginosa) at the concentrations studied (6.25-800 µg/mL). Some of the tested compounds exhibit an antifungal activity with a range of the MICs between 100 and 800 µg/mL Daha fazlası Daha az

A chemical research on three red algae Gracilaria bursa-pastoris, Phyllophora crispa and Laurencia obtusa var. pyramidata

Güven K.C. | Coban B. | Erdugan H.

Makale | 2014 | Asian Journal of Chemistry26 ( 18 ) , pp.6118 - 6120

In this paper, the exogenic and endogenic compounds in three red algae Gracilaria bursa-pastoris, Phyllophora crispa and Laurencia obtusa var. pyramidata were reported. Exogenic compounds detected are oil components and other pollutants such as, saturated and unsaturated aliphatic, cyclic and aromatic hydrocarbons, BHT, nonyl phenol and halogenated compounds as hexachloroethane and 4-chlorophenol. Endogenic compounds were fatty acids and its esters, eicosane, squalene, phytol. The algae can be used for monitoring of the sea pollution. © 2014, Chemical Publishing Co. All rights reserved.

Relationship among chlorine dose, reaction time and bromide ions on trihalomethane formation in drinking water sources in Istanbul, Turkey

Özdemir, Kadir | Toröz, İsmail | Uyak, Vedat

Makale | 2014 | Asian Journal of Chemistry26 ( 20 ) , pp.6935 - 6939

We investigate the effects of factors such as chlorine dose, reaction time and bromide ions on the formation and speciation of trihalomethanes during the chlorination of Istanbul reservoirs such as Terkos lake water, Büyükçekmece lake water and Ömerli lake water. The experimental results showed that approximately 50% of trihalomethane formation was observed in the first 4 h of reaction time in chlorinated Terkos lake water, Büyükçekmece lake water and Ömerli lake water, respectively. Trihalomethane concentrations increased with increasing chlorine dosage and reaction time. Chloroform was the major trihalomethane species forming as a . . . result of the chlorinated raw water samples. On the other hand, bromide ions play a great significant role in the distribution of trihalomethane species. The bromine and chlorine incorporation ratios were strongly related to natural organic matter precursors and bromide levels in Terkos lake water, Büyükçekmece lake water and Ömerli lake water. The percentage of bromine incorporation was much higher than that of chlorine in all chlorinated water samples Daha fazlası Daha az

Experimental investigation of trihalomethane formation and its modeling in drinking waters

Özdemir, Kadir | Yıldırım, Yılmaz | Toröz, İsmail | Uyak, Vedat

Makale | 2015 | Asian Journal of Chemistry27 ( 3 ) , pp.984 - 990

This research developed models using multiple linear regression analysis for the prediction of trihalomethane formation in coagulated Istanbul drinking water sources. The power-law model (model 1), using only ?UV272 as the designed parameter, proved the best model to describe the formation of trihalomethane. The other model (model 2), included pH, total organic carbon, chlorine dosages, ultraviolet absorbance at 254 nm (UV254), specific ultraviolet absorbance (SUVA) and differential absorbance at 272 nm (?UV272). The root-meansquare error (RMSE), normalization mean square error (NMSE), regression coefficient (R2) and index of agreem . . .ent (IA) were used as statistical variables to evaluate the model performance. The better prediction results were obtained by model 1 for root-mean-square error, normalization mean square error, R2 and index of agreement as 9.14, 0.015, 0.95 and 0.99, respectively. © 2015, Chemical Publishing Co. All rights reserved Daha fazlası Daha az

Synthetic route for racemic synthesis of trans-(1R,S, 3R,S)-2-methylene-1, 3-dithiane-1,3-dioxide and reactivity with N-carbethoxy-1,2-dihydropyridine as a dienophile

Gültekin Z. | Bayrak H. | Frey W.

Makale | 2006 | Asian Journal of Chemistry18 ( 2 ) , pp.1474 - 1480

Trans-(1R,S, 3R,S)-2-methylene-1,3-dithiane-1,3-dioxide has been prepared in 22% yield in three steps and cycloaddition of (4a) with N-carbethoxy-1,2- dihydropyridine gave a moderate diastereoselective (76:24) in 20% yield. All the major compounds (4b) and (7a) were determined by X-ray analysis.

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