A 55-year-old man is admitted with high fever, non-productive cough, and hyponatremia. A sputum gram stain shows many neutrophils but no visible organisms. Routine bacterial cultures are negative after 48 hours. The clinician suspects Legionella pneumophila infection. What is the most rapid and specific test for confirming the diagnosis?
Read DetailsThe gram stain of a pericardial fluid shows many tiny gram-negative coccobacilli. There is no growth on blood agar at 24 hours, but the chocolate agar shows small translucent colonies. The microbiologist performs a porphyrin test, which is positive. The organism should be identified as:
Read Details13. (WCSP[x], 6 points) Draw three constitutional isomers of the molecular formula of C5H10O. Isomer A should include a aldehyde. Isomer B should include an alcohol. Isomer C there are no requirements! Get creative! Give the number of sigma bonds in Isomer A in the box below.
Read DetailsA pediatric patient is brought to the clinic with acute onset of bilateral conjunctival redness, tearing, and crusting around the eyes. Several classmates have developed similar symptoms. A conjunctival swab is collected for culture. Gram stain shows small, pleomorphic gram-negative coccobacilli. What is the most common cause of the described illness?
Read Details(WCSP25) The cross sections of three different ionic compounds (labeled Compound 1, 2 and 3) are displayed in the figures below. In the figures, the charge on each ion is indicated, and the diameter of each circle reflects the diameter of each ion. Rank these compounds in order of increasing melting point. lowest [drop1] < [drop2] < [drop3] highest
Read Details[20pts] Consider the 3rd order ODE y”’-3y”=0 a) Write down the auxiliary equation and solve it (justify your answer) b) Find the general solution of the differential equation c) Find the solution that satisfies the initial values , y'(0)=4, y”(0)=6 Note: You must show all your work to deserve the full credit assigned to any question. y,
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