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13. Exploring Phenotype, Genotype, and the Production of Promising GABA Postbiotics by Lactiplantibacillus plantarum: A Comprehensive Investigation

Author

Abdel-motaal, Heba, primary, Abdelazez, Amro, additional, Wang, Peikun, additional, Abady, Ghada, additional, Abozaed, Shaima, additional, Ye, Bin, additional, Xu, Linan, additional, Zhao, Yuzhong, additional, Niu, Jianrui, additional, Alshehry, Garsa, additional, Algarni, Eman, additional, Aljumayi, Huda, additional, and Zhang, Xinglin, additional

Published
2024
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20. Identification and Characterization of a Novel Prophage Lysin against Streptococcus dysgalactiae.

Author

Xu, Linan, Li, Xingshuai, Yang, Xiangpeng, Zhao, Yuzhong, Niu, Jianrui, Jiang, Shijin, Ma, Junfei, and Zhang, Xinglin

Subjects
BOVINE mastitis, STREPTOCOCCAL diseases, ANTIBACTERIAL agents, NUCLEOTIDE sequencing, BACTERIAL growth
Abstract

Streptococcus dysgalactiae infection can cause bovine mastitis and lead to huge economic losses for the dairy industry. The abuse of antibiotics has resulted in growing drug resistance of S. dysgalactiae, which causes hard-to-treat infections. Bacteriophage lysin, as a novel antibacterial agent, has great potential for application against drug-resistant gram-positive bacteria. However, few studies have been conducted on the prophage lysin of S. dysgalactiae. In this study, we mined a novel prophage lysin, named Lys1644, from a clinical S. dysgalactiae isolate by genome sequencing and bioinformatic analysis. Lys1644 was expressed and purified, and the lytic activity, antibacterial spectrum, optimal pH and temperature, lytic activity in milk in vitro, and synergistic bacteriostasis with antibiotics were assessed. The Lys1644 prophage lysin showed high bacteriolysis activity specifically on S. dysgalactiae, which resulted in CFU 100-fold reduction in milk. Moreover, Lys1644 maintained high activity over a wide pH range (pH 5–10) and a wide temperature range (4–42 °C). Synergistic bacteriostatic experiments showed that the combination of low-dose Lys1644 (50 μg/mL) with a subinhibitory concentration of aminoglycoside antibiotics (kanamycin or spectinomycin) can completely inhibit bacterial growth, suggesting that the combination of Lys1644 and antibiotics could be an effective therapeutic strategy against S. dysgalactiae infection. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Study on Anaerobic Digestion of Oxytetracycline Residue Enhanced by Modified Biochar.

Author

LI ing, ZHONG Weizhang, NING Zhifang, NIU Jianrui, HAN Yonghui, and MA Caiyun

Subjects
BIOCHAR, OXYTETRACYCLINE, IRON removal (Water purification), ANAEROBIC digestion, IRON, RUMEN fermentation, DIGESTION, MICROBIAL communities, PROBLEM solving
Abstract

In order to explore the enhancement effect of biochar on anaerobic digestion, oxytetracycline residue was used as the substrate for anaerobic digestion, and biochar was added to solve the problems of low efficiency and weak stability of traditional anaerobic digestion. The strengthening effects of biochar and zero-valent iron modified biochar were illustrated by the changes of gas production, stability and microbial community. The results show that adding biochar alone and nano-scale zero-valent iron modified biochar can reduce the concentration of ammonia nitrogen in the system, reduce the influence of ammonia inhibition on anaerobic digestion, promote the transformation and consumption of VFAs, and improve the stability of the system. The gas production efficiency increased by 20.74% and 15.49% respectively, reaching above 115.20 mL/g. In addition, biochar can also strengthen the removal of residual oxytetracycline, and its removal efficiency is increased by 2.37% and 4.82% respectively compared with the control group, and the content of residual oxytetracycline in the final system can be reduced to below 10 mg/L. After adding zero-valent iron to biochar, the abundance of acid-producing bacteria and methano-genic archaea increased in different degrees, thus strengthening the process of anaerobic digestion and methanogenesis. [ABSTRACT FROM AUTHOR]

Published
2023
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41. Two novel recombinant avian leukosis virus isolates from Luxi gamecock chickens

Author

Niu Jianrui, Zhang Xinglin, Zhaoqing Han, Wang Peikun, Xue Cong, and Amro Abdelazez

Subjects
China, Sequence analysis, Virulence, Genome, Viral, Biology, Immunofluorescence, Genome, Virus, law.invention, 03 medical and health sciences, Viral Envelope Proteins, law, Virology, medicine, Animals, Phylogeny, Poultry Diseases, 030304 developmental biology, 0303 health sciences, Avian Leukosis Virus, Base Sequence, medicine.diagnostic_test, 030306 microbiology, Nucleic acid sequence, General Medicine, Avian Leukosis, Cell culture, Recombinant DNA, Chickens, Sequence Analysis, Reassortant Viruses
Abstract

Avian leukosis virus (ALV) is associated with immune suppression, neoplasia, and reduced performance in chickens. In this study, two strains of ALV were isolated from Luxi gamecocks by DF-1 cell culture and identified by PCR, immunofluorescence assay, and sequencing of the viral genome. These strains were found to be novel recombinant viruses with nucleotide sequence identity of over 93.0% in the LTR and 94.4% in U3 to ALV-J, over 95.0% in the 5'UTR to ALV-C, over 93.4% in gp85 to ALV-B, and over 96.0% in gp37 to ALV-E. These results indicate that these two isolates are recombinants between ALV-J, ALV-C, ALV-E and ALV-B.

Published
2020

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