Explain how the following scenario might have influenced the development of the antibiotic penicillin. Situation: In 1897, The Institut Pasteur receives the thesis of Duchesne regarding the Penicillium mold, “Contribution to the study of vital competition in micro-organisms: antagonism between moulds and microbes,” and decides to publish it instead of ignore it.

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Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20â°c throughout the year, while the walls of the room are nominally at 27â°c and 14â°c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32â°c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 â‹…â‹… k. what is the ratio of the thermal resistance due to convection to the thermal resistance due to radiation in the summer? what is the ratio of thermal resistances in the winter

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?