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M. S. Salwa,M. N. Nur Asshifa,A. A. Amirul,Ahmad R. M. Yahya 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.6
A locally-isolated=Pseudomonas aeruginosa USM AR2 possessing the ability to produce glycolipid-type biosurfactant (rhamnolipid) was used in this research to explore fermentation technology for rhamnolipid production. Rhamnolipid concentration in 2.5 L fed-batch fermentation was improved from 0.173 to 8.06 g/L by manipulating the feeding strategy and cultivation protocol. The culture was fed with petroleum diesel and complex medium. The highest rhamnolipid concentration was achieved when the culture was initially fed with both petroleum diesel and complex medium, followed by feeding of petroleum diesel only at the end of the stationary phase. Severe foaming problem was resolved by modifying and integrating a foam recycler to the bioreactor. This successfully extended the cultivation period and increased the yield of final rhamnolipid. No antifoam agent was added as this modified bioreactor allowed cultivation to proceed even under foam generation. The viscosity measurement, surface tension activity test, and drop-collapse test were performed as an indirect measure of rhamnolipid presence A locally-isolated=Pseudomonas aeruginosa USM AR2 possessing the ability to produce glycolipid-type biosurfactant (rhamnolipid) was used in this research to explore fermentation technology for rhamnolipid production. Rhamnolipid concentration in 2.5 L fed-batch fermentation was improved from 0.173 to 8.06 g/L by manipulating the feeding strategy and cultivation protocol. The culture was fed with petroleum diesel and complex medium. The highest rhamnolipid concentration was achieved when the culture was initially fed with both petroleum diesel and complex medium, followed by feeding of petroleum diesel only at the end of the stationary phase. Severe foaming problem was resolved by modifying and integrating a foam recycler to the bioreactor. This successfully extended the cultivation period and increased the yield of final rhamnolipid. No antifoam agent was added as this modified bioreactor allowed cultivation to proceed even under foam generation. The viscosity measurement, surface tension activity test, and drop-collapse test were performed as an indirect measure of rhamnolipid presence
EL-Taher Eman M. M.,El-Sherei Moshera M.,El Dine Riham Salah,ElNaggar Dina M.Y.,Khalil Wagdy K. B.,Kassem Salwa M.,Elkhateeb Ahmed,Kassem Mona E. S. 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.1
From the phenolic profile of Acacia pennata L. leaves hydromethanolic extract, nine flavonoids were tentatively character- ized (liquid chromatography-electrospray ionization mass spectrometry), of which Kaempferol 3,7-di-O-hexoside, Apigenin 6,8-di-C-hexoside, Luteolin-6-C-pentoside-8-C-hexoside, Apigenin-6-C-hexoside-8-C-pentoside and Apigenin-6-C-pento- side-8-C-hexoside were detected for the first time from the plant. Three doses of the plant extract (12.5, 25 and 50 mg/kg bw/d, four weeks treatment) were used to assess its protective effect against acetominophen induced genotoxicity in hepatic cells of male rats (2 g/kg bw twice per week). A. pennata extract and Acetominophen treated animal groups attenuated DNA damage rates (Comet assay) by 5.6, 6.2 and 6.4% for the three doses, respectively, compared with the acetaminophen treated and untreated groups by 21.2% and 5.8%, respectively. It also decreased DNA fragmentation, significantly down-regulate the expression of p53 tumour suppressor gene and mdr1b multidrug resistance gene [real-time PCR (qPCR)] and ROS genera- tion rates induced by Acetaminophen by 715.4, 453.8 and 376.9% in rats in a dose dependant effect. The results highlighted the DNA protection potential of A. pennata phytoconstituents from drug abuse harmful effects.
Fungal biopriming increases the resistance of wheat to abiotic stress
Ashraf S. A. El-Sayed,Hanan E. Dief,El-Sayed A. Hashem,Ahmed M. Desouky,Zamarud Shah,Salwa Fawzan 한국식물생명공학회 2022 JOURNAL OF PLANT BIOTECHNOLOGY Vol.49 No.2
Increasing soil salinity is one of the global challenges that the agriculture sector in Egypt has been facing; 33% of the cultivated land in Egypt, which includes merely 3% of the entire land area, is already salinized. The present review sheds light on the role of fungal biopriming, a technique in which hydrated seeds are inoculated with beneficial fungal flora, in mitigating the deleterious influence of NaCl tension. Endophytic fungi were recognized to be able to interact with several plant species, markedly contributing to the mitigation of NaCl stress in these plants, such that some plants get impoverished to their absent associated microbes under stressful conditions