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RISS 인기검색어
- 검색키워드
- 저자 : Asmaa N. Mohammed (검색결과 3 건)
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Fatma M. M. Korni,Asmaa N. Mohammed,Usama K. Moawad,Nour El-Houda y. Hassan,Ahmed Farghali,Rehab K. Mahmoud 한국어병학회 2023 한국어병학회지 Vol.36 No.1
Nanotechnology seeks to improve material effectiveness to have a greater impact on medicine. The current study was performed to determine how effective dietary propolis (PR) and propolis nanoparticles (PR-NPs) were at improving immune and anti-oxidant status, lowering cortisol levels as stress indicators, and preventing Pseudomonas aeruginosa infection in O. niloticus. Histopathology was carried out. Fish (N = 516, 25 ± 2g) were fed basal diets supplemented with 1 gm PR/kg, 2 gm PR/kg, 1 gm PR-NPs/kg, 2 gm PR-NPs/kg feed and control diet for 28 days. When compared to the control, interlukin-1, IgM, complement 5, and levels of lysozyme were dramatically higher in PR and PR-NPs fed-groups. Antioxidant enzymes and glutathione levels were higher in fish fed PR and PR-NPs, but malondialdehyde levels were lower. Cortisol levels decreased in feeding groups compared to the control. When compared to O. niloticus group fed 1 gm PR/kg and the positive control, propolis nanoparticles successfully prevented P. aeruginosa infection and the mortality rate was zero. When compared to the negative control, the positive control group's histopathological findings revealed severe histopathological changes. In low and high groups fed PR-NPS, normal structures were observed as well as high concentrations of PR after being injected with P. aeruginosa. The group that was fed low concentrations of PR after being injected with P. aeruginosa showed only minor histopathological changes. Conclusion: Dietary supplementation of PR or PR-NPs may have a beneficial effect on aquaculture, with PR-NPs having a superior effect.
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Impact of Seasonal Conditions on Quality and Pathogens Content of Milk in Friesian Cows
Zeinhom, Mohamed M.A.,Abdel Aziz, Rabie L.,Mohammed, Asmaa N.,Bernabucci, Umberto Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.8
Heat stress negatively affects milk quality altering its nutritive value and cheese making properties. This study aimed at assessing the impact of seasonal microclimatic conditions on milk quality of Friesian cows. The study was carried out in a dairy farm from June 2013 to May 2014 at Beni-Suef province, Egypt. Inside the barn daily ambient temperature and relative humidity were recorded and used to calculate the daily maximum temperature-humidity index (mxTHI), which was used as indicator of the degree of heat stress. The study was carried out in three periods according to the temperature-humidity index (THI) recorded: from June 2013 to September 2013 (mxTHI>78), from October 2013 to November 2013 (mxTHI 72-78) and from December 2013 to April 2014 (mxTHI<72). Eighty Friesian lactating dairy cows were monitored in each period. The three groups of cows were balanced for days in milk and parity. Milk quality data referred to somatic cell count, total coliform count (TCC), faecal coliform count (FCC), Escherichia coli count, percentage of E. coli, and Staphylococcus aureus, percentage of fat, protein, lactose, total solid and solid non-fat. Increasing THI was associated with a significant decrease in all milk main components. An increase of TCC, FCC, and E. coli count from mxTHI<72 to mxTHI>78 was observed. In addition, the isolation rate of both S. aureus and E. coli increased when the mxTHI increased. The results of this study show the seriousness of the negative effects of hot conditions on milk composition and mammary gland pathogens. These facts warrant the importance of adopting mitigation strategies to alleviate negative consequences of heat stress in dairy cows and for limiting related economic losses.
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Korni, Fatma M. M.,Moawad, Usama K.,Mohammed, Asmaa N.,Edrees, Asmaa The Korean Society of Fish Pathology 2022 한국어병학회지 Vol.35 No.1
Aquaculture development is based on the ideas of increasing production while reducing economic losses. Bacterial diseases are the leading source of fish cases. Citrobacter freundii has been linked to septicemia and mortality all over the world. In the current study, the cause of mortality in O. niloticus was C. freundii MW279218. External hemorrhages were seen on the affected fish, as well as paleness in the liver and kidney congestion. C. freundii MW279218 had a median lethal dosage of 1.5×10<sup>5</sup> CFU/mL. Zinc oxide and zinc oxide nanoparticles (ZnO-NPs) were tested for their biocidal effectiveness against C. freundii MW279218. The lethal effect of ZnO-NPs for C. freundii MW279218 was 100% when compared to zinc oxide compound, and the inhibition zone width was 2.31.1mm at the highest tested concentrations (70 mg/L) compared to the lowest (35 and 45 mg/L, respectively). Fish were fed three different diets for 28 days: diet 1 (no additives), diet 2 (100 mg of ZnO-NPs/kg of feed), and diet 3 (200 mg of ZnO-NPs/kg of feed). Organs were also collected for histopathology 96 hours after injection (P<0.05). In the groups given 200 mg of ZnO-NPs, there was 10% mortality and 80% RPS. The group fed 100 mg of ZnO-NPs/kg, on the other hand, had 20% mortality and 60% RPS, compared to 50% mortality in the control positive group. Histopathological examinations demonstrated significant alterations in the control positive group and mild lesions in the hepatopancreas of the groups administered 100 mg ZnO-NPs/kg of feed. The groups fed 200 mg of ZnO-NPs/kg diet, on the other hand, showed no histological alterations. ZnO-NPs were found to be effective in the up regulation of both IL-10 and complement 5 immune-related genes.
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