electron microscopy - Overflow

Tossup

Preventing the use of rotationally symmetric static fields in this technique can help overcome a limit set by Scherzer’s theorem. The “spot-scan” technique is sometimes used to prevent beam-induced motion in this larger technique. (10[1])Samples in this technique may use heavy metals such as tungsten and osmium to undergo a “negative stain.” The development of a form of this technique, for which Dubochet, (10[1])Frank, and Henderson were awarded the 2017 Nobel Prize in Chemistry, generated a “resolution revolution.” In a form of this technique, the observed specimen is embedded in vitrified ice before being mounted on a grid and fixed (-5[1])via plunging in liquid ethane. For 10 points, name this imaging technique that comes in “scanning,” “transmission,” and “cryogenic” types. ■END■ (10[1]0[1])

ANSWER: electron microscopy [or EM; accept cryogenic electron microscopy or cryo-EM or transmission electron microscopy or TEM or scanning electron microscopy or SEM; prompt on microscopy]

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Buzzes

Player	Team	Opponent	Position	Value
Nikhil Chellam	Northwestern A	Iowa	33	10
Allan Lee	Stanford B	Purdue	62	10
Jacob Finley	Notre Dame A	Northwestern B	99	-5
Ved Muthusamy	Northwestern B	Notre Dame A	120	0
Jonah Hubert	Notre Dame B	Georgetown B	120	10

Summary

Tournament	Edition	TUH	Conv. %	Neg %	Average Buzz
Lower Mid-Atlantic	2025-02-01	6	83%	17%	116.00
Midwest	2025-02-01	6	100%	50%	96.50
Northeast	2025-02-01	4	75%	25%	109.33
Overflow	2025-02-01	4	75%	25%	71.67
Pacific Northwest	2025-02-01	2	100%	50%	118.00
UK	2025-02-01	10	90%	0%	91.78
Upper Mid-Atlantic	2025-02-01	8	88%	0%	94.14