Three 4″ x 6″ X 0.5″ specimens of oak are tested in bending…

Three 4″ x 6″ X 0.5″ specimens of oak are tested in bending with the ends simply supported.  A uniform load, along a line, is applied at the center of the oak beam as shown in the sketches.  The wood grain is oriented as shown.  If the uniform load is the same in all tests, which specimen will likely fail first?

A 4-year-old girl presents with a 2-day history of muscle we…

A 4-year-old girl presents with a 2-day history of muscle weakness. Her parents state she has stopped walking, and she tells them her legs feel “loose.” Two weeks ago, she had mild flu-like symptoms, including fever, sore throat, headache, and fatigue. Her family is seeking asylum from West Africa. Her vitals are blood pressure 110/78 mm Hg, heart rate 64 bpm, respiratory rate 15 breaths/min, and temperature 98 °F (36.7 °C). The physical examination demonstrates asymmetric proximal muscle weakness in the lower extremities and the absence of reflexes. Polymerase chain reaction confirms the suspected diagnosis. A vaccine would have prevented this child’s condition. Which of the following is a component of this vaccine?