The occurrence and significance of Pseudomonas aeruginosa isolated from some meat products in Sohag city.

Contamination of meat and meat products with pathogenic and spoilage microorganisms is one of the most important challenges facing the meat industry that results in a range of human health problems and economic losses. This work aimed to identify the occurrence of Pseudomonas spp. especially Pseudomonas aeruginosa (P. aeruginosa) in some processed and ready-to-eat meat products in Sohag governorate. A total of 200 random meat product samples; minced beef meat, luncheon, burger, and sausage (50 of each) were purchased from different markets in Sohag governorate, Egypt over a period of 12 months from November 2020 to October 2021. Pseudomonas spp. was suspected in 32 (15%) of the meat products examined samples using the colony morphology on Cetrimide agar, represented as follows; 30%, 18%, 6%, and 10% in minced beef meat, luncheon burger, and sausage, respectively. Using the morphological and biochemical methods, P. aeruginosa was suspected in 12 isolates (37.5%) with an incidence of 12/200 (6%) of the total examined samples. The PCR results revealed that only 8/12 (66.7%) of the suspected isolates encoded the 16S rDNA gene of P. aeruginosa with an incidence of 4% of the total examined samples, 4 (50%) of which were detected in the minced beef meat samples, 2 (25%) in the sausage samples while in the luncheon and burger P. aeruginosa was identified in only 1 sample (12.5%) for each

Effect of some essential oils against Aeromonas hydrophila artificially inoculated into raw Nile Tilapia fish fillets during refrigeration storage.

Aeromonas spp. is one of the emerging foodborne pathogens that gained importance during the last decades because of its zoonotic potential and as one of the specific spoilage organisms in seafood products. Agar well-diffusion assay revealed that cinnamon EO-Trans Cinnamaldehyde- (TC) and garlic Eos (GEO) showed the highest zone of inhibition against Aeromonas strains 18 mm for each at 0.5 % followed by thyme EO (TEO) (12 mm). While Clove EO (CEO) and onion EO (OEO) didn’t inhibit the growth of Aeromonas spp. Resazurin microtiter plate assay indicated that the MIC values were 3.125 mg/ml for GEO, 6.25 mg/ml for TC, 12.5 mg/ml for CEO, 50 mg/ml for TEO, and 75 mg/ml for OEO. The application of cinnamon, clove, garlic, thyme, and onion Eos against Aeromonas spp. on tilapia fish fillets stored at 4oC showed that among the low concentration of Eos (25 mg/ml), cinnamon and clove Eos showed a significant reduction in Aeromonas counts. Also, the higher concentration of CEO (25 mg/ml) caused a significant reduction rate. Counts of A. hydrophila in tilapia fish fillets of Eos treated samples were significantly different compared to the initial counts. EOS showed a significant reduction in the PH value of fish fillets except for the lower concentrations of TEO & OEO (alpha =0.052, P>0.05). A shelf-life extension of 2-3 days was achieved with essential oils treatment. They could be recommended as natural antimicrobial control of A. hydrophila in fish fillets

Detection of Salmonella species in chicken carcasses using genus specific primer belong to invA gene in Sohag city, Egypt

Aim: This study aimed to detect Salmonella species found as contaminants in chicken carcass (thigh, breast, wings, liver, and gizzard). Materials and Methods: A total of 75 chicken samples including thigh, breast, wings, liver, and gizzard (15 of each) were collected from different markets in Sohag city for detection of Salmonella species by culture methods, biochemical tests, serology, and polymerase chain reaction. Results: The overall incidence of Salmonella contamination of 75 examined samples was found to be 6.6% with the higher percentage of Salmonella being isolated from liver samples (13.3%) followed by thigh, wings, gizzard (6.6%) while breast show negative result. Conclusion: Results in this study indicate that contamination of chicken carcass with Salmonella needs strict hygienic measures to prevent their transmission to human

Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)

In 2008, we published the first set of guidelines for standardizing research in autophagy. Since then, this topic has received increasing attention, and many scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Thus, it is important to formulate on a regular basis updated guidelines for monitoring autophagy in different organisms. Despite numerous reviews, there continues to be confusion regarding acceptable methods to evaluate autophagy, especially in multicellular eukaryotes. Here, we present a set of guidelines for investigators to select and interpret methods to examine autophagy and related processes, and for reviewers to provide realistic and reasonable critiques of reports that are focused on these processes. These guidelines are not meant to be a dogmatic set of rules, because the appropriateness of any assay largely depends on the question being asked and the system being used. Moreover, no individual assay is perfect for every situation, calling for the use of multiple techniques to properly monitor autophagy in each experimental setting. Finally, several core components of the autophagy machinery have been implicated in distinct autophagic processes (canonical and noncanonical autophagy), implying that genetic approaches to block autophagy should rely on targeting two or more autophagy-related genes that ideally participate in distinct steps of the pathway. Along similar lines, because multiple proteins involved in autophagy also regulate other cellular pathways including apoptosis, not all of them can be used as a specific marker for bona fide autophagic responses. Here, we critically discuss current methods of assessing autophagy and the information they can, or cannot, provide. Our ultimate goal is to encourage intellectual and technical innovation in the field