Search

Lichens are complex associations constituted mainly by a mycobiont and a photobiont, several analyzes have shown the presence of bacteria associated with said symbiosis, however, in Guanajuato, research at this level is scarce. The objective of this study was to isolate and molecularly identify bacteria of different genera associated with lichens in the state of Guanajuato. A random sampling of 21 lichens was carried out in the protected natural area "Las Palomas" and they were identified morphologically and chemically, from these the bacteria were isolated and identified in different solid culture media. The isolates obtained were identified by Gram staining and 16S rDNA gene sequencing. 8 foliose lichens, 7 fruticose and 6 crustose, were recorded, of which the genera Punctelia, Cladonia and Lepraria stand out. Of the 34 isolated bacterial strains, the Proteobacteria phylum was found to be the most abundant (58.82%), followed by Firmicutes (32.35%) and Actinobacteria (8.82%), mainly from foliose and fruticose lichens. Genera such as Mesorhizobium sp. and Stutzerimonas sp. The description of bacteria associated to lichens contributes to the knowledge of the probable functions that they perform within lichens. [ABSTRACT FROM AUTHOR]

Mastitis is one of the most important diseases for the dairy industry worldwide due to the great economic losses it causes, and the bacterial agents that it causes variation from one herd to another. The objective of the investigation was determined the infectious agents involved in the development of mastitis in specialized dairies herds in the Highlands of Boyacá, Colombia. Was performed CMT tests in 4432 teats to determine the positive results for inflammation (CMT + 2), sampling in aseptic material of positives quarters, identification and differentiation of through microbiological cultures, Gram staining, and biochemical tests of bacterial and fungal agents presents in milk samples. It was determined that prevalence's varied between the years of the study, in 2016 there was a total prevalence of 45.19%, in 2017: 51.06% and in 2018: 39.76%. The months of April, May, and September, October presented the highest number of teats affected with mastitis during the three years of study. Streptococcus agalactiae and Staphylococcus aureus were the most prevalent microorganisms that cause mastitis in the three study years. There was an increase in the prevalence of infected teats corresponding to the months (April, May, September, and October) due to rainfall increases. The contagious pathogens were most prevalent that environmental pathogens. [ABSTRACT FROM AUTHOR]

Copyright of Journal of the Chinese Society of Animal Science is the property of Chinese Society of Animal Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)