Publications by authors named "M Youssef"

789 Publications

Natural radioactivity levels in benthic foraminifera as a pollution indicator.

Isotopes Environ Health Stud 2021 Sep 22:1-9. Epub 2021 Sep 22.

Geology and Geophysics Department, College of Science, King Saud University, Riyadh, Saudi Arabia.

as one of the benthic foraminifer's genera were collected from three coastal lagoons (Abu Shaar, Umm al-Huwaytāt, and Marsa Shūni) on the Egyptian Red Sea coast and investigated for their Ra, Th, and K content using HPGe gamma-ray spectrometry. shells show high radioactivity levels with average activity concentration values of 251.8 ± 18.3, 86.8 ± 7.7, and 791.2 ± 57.6 Bq kg, 327.1 ± 11.4, 97.4 ± 7.1, and 751.6 ± 54.7 Bq kg, 246.6 ± 17.7, 65.1 ± 4.8, and 477.6 ± 34.8 Bq kg for Ra, Th, and K in the samples from Abu Shaar, Umm al-Huwaytāt, and Marsa Shūni, respectively. Ra and K have a high tendency to accumulate in compared to Th. High bioaccumulation of the studied radionuclides was found for samples from Umm al-Huwaytāt and Abu Shaar lagoons. Radiological parameters such as radium equivalent activity, gamma absorbed dose rate in air, and outdoor annual effective dose were calculated, and values higher than the permissible limits were obtained. Based on the obtained results, the estimation of radioactivity levels in shells may serve as an indicator of marine environment pollution.
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http://dx.doi.org/10.1080/10256016.2021.1974854DOI Listing
September 2021

Monitoring of Antimicrobial Susceptibility of Bacteria Isolated from Poultry Farms from 2014 to 2018.

Vet Med Int 2021 10;2021:6739220. Epub 2021 Sep 10.

Reference Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Agricultural Research Center (ARC), Nadi El-Seid Street, Dokki P.O. Box 246, Giza 12618, Egypt.

The current situation of antibiotic resistance of most bacterial pathogens was a threat to the poultry and public health with increasing economic losses. Regarding this problem, monitoring of the circulating microorganisms occurred with the antibiotic resistance profile. A total of 657 different samples from internal organs (liver, heart, lung, and yolk) and paper-lining chick boxes were collected from native chicken farms which were submitted to the Reference Laboratory for Veterinary Quality Control on Poultry Production in the period from 2014 to 2018 for the detection of , (. , and . The bacterial isolates were tested for their antimicrobial susceptibility by disk diffusion technique. was isolated from 128 out of 657 (19.5%), . was isolated from 496 out of 657 (75.5%), and species was isolated from 497 out of 657 (75.6%). All positive samples were examined for antibiotic resistance against 10 different antibiotics, and the highest percentage all over the five years was against penicillin, ampicillin, and tetracycline. All E. positive samples were examined for antibiotic resistance against 14 different antibiotics, and the highest percentage all over the five years was with ampicillin, tetracycline, norfloxacin, streptomycin, and danofloxacin. All positive sample species were examined for antibiotic resistance against 14 different antibiotics, and the highest percentage of resistance all over the five years was shown with tetracycline, streptomycin, ampicillin, and nalidixic acid.
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http://dx.doi.org/10.1155/2021/6739220DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8448596PMC
September 2021

Investigation of the dissipation behaviour and exposure of spitotetramat, flonicamid, imidacloprid and pymetrozine in open field strawberries in Egypt.

Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2021 Sep 15:1-9. Epub 2021 Sep 15.

Pesticide Residues and Environmental Pollution Department, Central Agricultural Pesticide Laboratory, Agricultural Research Center, Giza, Egypt.

The dissipation behaviour and the consumer risk assessment of spitotetramat, flonicamid, imidacloprid and pymetrozine in open field strawberries were studied. Insecticides were applied at the authorised levels and the more critical good agricultural practice regimes (GAP). The initial concentrations varied from 0.069 to 1.75 mg kg depending on the compound, while the dissipation half-lives and terminal residues, 14 days from the last applications, were similar. After application according to the authorised pattern the half-lives were 2.8 days for flonicamid and 3.2 days for spitotetramat, imidacloprid and pymetrozine. The dietary risk assessment, performed using the hazard quotient and the EFSA PRIMo model showed no concern to consumer health with exposure values <2% of the acceptable daily intake (ADI) and <32% of the acute reference dose (ARfD) of each compound.
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http://dx.doi.org/10.1080/19440049.2021.1973113DOI Listing
September 2021

Distance traveled to glioblastoma treatment: A measure of the impact of socioeconomic status on survival.

Clin Neurol Neurosurg 2021 Aug 28;209:106909. Epub 2021 Aug 28.

Department of Neurological Surgery, The University of Texas Southwestern Medical Center, Dallas, TX, USA; Harold C. Simmons Comprehensive Cancer Center, The University of Texas Southwestern Medical Center, Dallas, TX, USA; Peter O'Donnell Jr. Brain Institute, Dallas, TX, USA. Electronic address:

Background: Previous studies have shown improved post-surgical outcomes in patients who travel farther for glioblastoma treatment. This study investigates socioeconomic and facility factors that may influence this relationship.

Methods: Overall survival was calculated and compared by distance to treatment facility using univariate and multivariate survival models. The analysis was stratified by facility type, income quartile and insurance status and the association re-evaluated. Kaplan-Meier survival curves were created to analyze the relationship between overall survival and distance group.

Results: Individuals who traveled less than 5 miles to treatment had the shortest overall survival (11.8 months), while those who traveled greater than 50 miles had the longest survival (12.9 months). Stratification by income quartile failed to demonstrate an association between distance traveled and survival for those making less than $63,000 (adjusted hazard ratio range: 0.94-1.01). There was no association between survival and distance traveled for patients treated at a community cancer center, comprehensive community cancer center or an integrated network cancer program (adjusted hazard ratio range: 0.86-1.04).

Conclusion: Financial strain, rather than distance traveled to treatment, may be associated with glioblastoma survival.
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http://dx.doi.org/10.1016/j.clineuro.2021.106909DOI Listing
August 2021

Silencing of Molecular Targets with Relevance to Insecticide Resistance in Colorado Potato Beetle Using dsRNA.

Methods Mol Biol 2022 ;2360:49-58

Department of Chemistry and Biochemistry, Université de Moncton, Moncton, NB, Canada.

Various approaches based on RNA interference (RNAi) have garnered significant attention in the field of insect pest management in recent years. For example, the use of double-stranded RNA (dsRNA) has notably been investigated to target transcripts of interest with relevance to insecticide resistance in multiple pests and has emerged as a potential tool to be deployed in agricultural fields in the near future. A careful characterization of a given dsRNA in a laboratory setting, including the assessment of dsRNA-mediated molecular and phenotypical changes observed in the targeted pest upon dsRNA exposure, is nevertheless essential prior to its use in field-based study. The current chapter thus describes the process via which a dsRNA, aimed at a molecular target underlying insecticide response in the Colorado potato beetle Leptinotarsa decemlineata, is conceived, synthesized and injected. Assessment of knockdown efficiency in injected insects is further presented.
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http://dx.doi.org/10.1007/978-1-0716-1633-8_5DOI Listing
January 2022
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