Abstract This study aimed to evaluate the antibacterial activity of flavonoids extracted from two Libyan brown algae namely Cystoseira compressa and Padina pavonica using microwave-assisted extraction method against pathogenic bacteria isolated from meat, meat products, milk and dairy products (Staphylococcus aureus subsp. aureus (5 isolates), Bacillus cereus (3 isolates), Bacillus pumilus (1 isolate), Salmonella enterica subsp. enteric (4 isolates) and Enterohaemorrhagic Escherichia coli O157 (EHEC O157) (4 isolates)). All of these isolates were muti-drug resistant with high MAR index. The results showed that C. compressa extract exhibited better and stronger antibacterial activities against the seventeen tested isolates with inhibition zones diameter ranged from 14 - 22 mm compared to P. pavonica extract which showed positive effect against 9 isolates with low inhibition zone ranged from 11 - 16.5 mm. Flavonoids extracted from C. compressa also displayed the best spectrum of bactericidal effect with a ratio MBC/MIC ≤ 4 obtained on all susceptible tested bacterial strains. Flavonoids and proanthocyanidins significantly contributed to the antibacterial properties. The mode of action of these active extracts is under investigation.
Hesham Taher Naas(1-2017)

ATP-induced membrane potential and contraction in smooth muscle of chicken anterior mesenteric artery arabic 15 English 107
Marwan Draid(8-2011)

This study was conducted to investigate the prevalence of Newcastle Disease, Avian Influenza, Infectious Bronchitis, and Infectious laryngotracheitis in some regions of Tripoli-Libya. Serum samples were collected from Four broiler farms in Wadi Alrabea area, two layer farms and one backyard farm in Gaser Bin Gasher, two layer farms in Alswani and one backyard farm in Zliten City and screened for the presence of antibodies against LPAI-H9, HPIA-H5, HPIA-H7, ND, IB 4/91 strain using the HI test and antibodies against ILT virus by ELISA. The overall seroprevalence of H9, H5, H7, ND, IB4/91 and ILT was 26.5%,0%,0%,, 29.5%,43% and 30% respectively. All sera tested for AI-H5 and AI-H7 were negative. In Wadi Alrabea flocks, seroprevalence of H9, H5, H7, ND, IB4/91 and ILT was 44%, 0%, 0%, 16.28%, 32.56% and 0% respectively. Where as in Gaser Bin Ghasher, was 24%,0%, 0%, 33.87, 36.29% and 39% respectively. In Alswani, the seroprevalence was 8.70%, 0%, 0%, 52.17%, 54.35% and 54.3%. The seroprevalence of H9, H5, H7 in Gaser Bin Ghasher backyard chickens was 23%, 0%, 0% respectively and the seroprevalence of H9, H5, H7, ND, IB4/91 of Zliten backyards was 12%, 0%, 0%, 12%, 96% respectively. Further investigations are recommended to identify the circulating virus genotypes and models of transmission for better understanding of these viruses epidemiology in backyard chickens in Libya. Vaccination of backyard chickens against ND using heat resistant strain is highly recommended.
Housen Ashareef Mohammed, Abdulatif Abdulaziz Asheg (10-2021)