I will focus on analyzing brick samples from this historic site and comparing them with those from St. Louis Cathedral. This analysis includes measuring the length, width, and thickness of each brick, as well as conducting a Munsell color analysis. These measurements and color assessments will help reveal variations within the samples.
Understanding the brick composition of these buildings not only aids in their preservation but also explains past failures in construction and maintenance. Anthropogenic noise pollution is a growing threat to sound producing fishes and other marine animals that rely on hearing.
For most fishes hearing relies on the presence of saccular hair cells, which can be damaged when fishes experience loud noises. Sensory hair cell proliferation, the addition of hair cells during growth, and regeneration, the addition of hair cells following noise damage, in the ear is documented from relatively few teleosts.
In this study, we determined if Atlantic Croaker Micropogonias undulatus saccular hair cells proliferate and regenerate after noise exposure. We used in vivo injections of Bromodeoxyuridine BrdU and immunohistochemistry to assess cell proliferation rates among a control group and four recovery treatments - 0-, 2-, 4-, and 6-days following noise exposure. A 2-factor linear model was used to determine if proliferation differed among treatments after accounting for body size.
Hair cell proliferation was highest in spring non-reproductive season , but proliferation did not increase following noise exposure i. To verify that damage occurred following noise exposure, a second experiment was conducted to determine if hair cell bundle loss and apoptosis hair cell death was higher in noise-exposed fish compared to a control group. Atlantic Croaker hair cell addition following noise damage does not exceed normal hair cell proliferation rates and thus epithelial damage following acoustic trauma may persist longer than expected from studies in other fishes.
