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https://www.selleckchem.com/products/idf-11774.html Sound and hearing play an important role in the lives of many birds, and studies have been published on the acoustic habitat of various species, as well as on various aspects of their hearing system. However the function of the middle ear remains largely unexplored, with existing studies focusing on either single species, or a very narrow range of species. In this article we report measurements of the middle ear transfer function in 39 taxonomically diverse avian species. We used laser vibrometry to measure the vibrations of the columellar footplate in response to tones played in each animal's ear canal, and calculated the middle ear transfer functions. Transfer functions varied substantially across species, but appeared to follow common trends. Comparisons between the peak frequency in the transfer function and length/mass of the columella reveal a correlation between the three, however statistical analysis suggests that columellar length is a primary indicator of the peak frequency. These results provide a broad survey of avian middle ear function, and the observed trends provide a method with which to begin to predict the response of single ossicle middle ear systems. ST-segment elevation myocardial infarction (STEMI) is a fatal cardiovascular emergency requiring rapid reperfusion treatment. During the coronavirus disease-2019 (COVID-19) pandemic, medical professionals need to strike a balance between providing timely treatment for STEMI patients and implementing infection control procedures to prevent nosocomial spread of COVID-19 among health care workers and other vulnerable cardiovascular patients. This study evaluates the impact of the COVID-19 outbreak and China Chest Pain Center's modified STEMI protocol on the treatment and prognosis of STEMI patients in China. Based on the data of 28,189 STEMI patients admitted to 1,372 Chest Pain Centers in China between December 27, 2019 and February 20, 2020, the stu

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