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Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office 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.)

Copyright of Turkish Bulletin of Hygiene & Experimental Biology / Türk Hijyen ve Deneysel Biyoloji is the property of Refik Saydam National Public Health Agency 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.)

The gut microbiome and the gut brain axis are potential determinants of Alzheimer's disease (AD) etiology or severity and gut microbiota might coordinate with the gut-brain axis to regulate behavioral phenotypes in AD mouse models. Using 6-month-old human amyloid precursor protein (hAPP) knock-in (KI) mice, which contain the Swedish and Iberian mutations [APP NL-F (App NL–F)] or the Arctic mutation as third mutation [APP NL-G-F (App NL–G–F)], behavioral and cognitive performance is associated with the gut microbiome and APP genotype modulates this association. In this study, we determined the feasibility of behavioral testing of mice in a biosafety cabinet and whether stool from 6-month-old App NL–G–F mice or App NL–G–F crossed with human apoE4 targeted replacement mice is sufficient to induce behavioral phenotypes in 4-5 month-old germ-free C57BL/6J mice 4 weeks following inoculation. We also compared the behavioral phenotypes of the recipient mice with that of the donor mice. Finally, we assessed cortical Aβ levels and analyzed the gut microbiome in the recipient mice. These results show that it is feasible to behaviorally test germ-free mice inside a biosafety cabinet. However, the host genotype was critical in modulating the pattern of induced behavioral phenotypes as compared to those seen in the genotype- and sex-match donor mice. Male mice that received stool from App NL–G–F and App NL–G–F/E4 donor genotypes tended to have lower body weight as compared to wild type, an effect not observed among donor mice. Additionally, App NL–G–F/E4 recipient males, but not females, showed impaired object recognition. Insoluble Aβ40 levels were detected in App NL–G–F and App NL–G–F/E4 recipient mice. Recipients of App NL–G–F, but not App NL–G–F/E4, donor mice carried cortical insoluble Aβ40 levels that positively correlated with activity levels on the first and second day of open field testing. For recipient mice, the interaction between donor genotype and several behavioral scores predicted gut microbiome alpha-diversity. Similarly, two behavioral performance scores predicted microbiome composition in recipient mice, but this association was dependent on the donor genotype. These data suggest that genotypes of the donor and recipient might need to be considered for developing novel therapeutic strategies targeting the gut microbiome in AD and other neurodegenerative disorders. [ABSTRACT FROM AUTHOR]

Copyright of SDU Journal of Engineering Sciences & Design / Mühendislik Bilimleri ve Tasarım Dergisi is the property of Journal of Engineering Sciences & Design 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.)

We assessed in this study the total airborne bacteria (TAB), gram-negative bacteria (GNB), and endotoxin (ET) concentrations in three Korean university laboratories and two hospital diagnostic laboratories categorized as biosafety level 1 (BL 1) or biosafety level 2 (BL 2). We also investigated the concentrations of TAB, GNB, and ET relative to the performance results of biosafety cabinets (BSCs). TAB and GNB were incubated, and ET was analyzed using the kineticLimulus amebocyte lysateassay. A total of 246 (TAB = 95, GNB = 95, ET = 56) air samples were collected from nine laboratories. TAB, GNB, and ET concentrations were significantly higher in BL 1 laboratories and in laboratories that failed the BSC performance test compared to BL 2 laboratories and laboratories that passed the BSC performance test. Correlation coefficients were calculated to determine the relationships between TAB, GNB, and ET, and it was found that TAB significantly correlated with GNB (r = 0.35,p< .01) and ET (r = 0.29,p< .01). Careful attention needs to be paid to BL 1 laboratories, and BSCs should be managed on a regular basis to improve the air quality of university and hospital laboratories. [ABSTRACT FROM AUTHOR]