상위 운동 신경세포의 손상 여부를 진단하기 위해 가운뎃손가락 끝을 튕겼을 때 다른 손가락이 굽혀지는지 확인하는 신경학적 검사 방법.
A neurological examination finding where flicking the nail of the middle finger induces flexion of the thumb or index finger, suggesting upper motor neuron disease.
예문:
"The presence of a positive Hoffman sign may indicate cervical spinal cord compression."
"Neurologists use the Hoffman reflex test as a screening tool during physical examinations."
물을 전기 분해하여 수소와 산소를 분리하고 그 부피를 측정하기 위해 고안된 세 개의 수직 유리관으로 구성된 장치.
An apparatus for the electrolysis of water, typically consisting of three joined upright glass cylinders.
예문:
"In the chemistry lab, we used a Hoffman apparatus to demonstrate the composition of water."
"The Hoffman voltameter allows for the precise measurement of gas volumes produced during electrolysis."
아미드를 1차 아민으로 전환하거나, 4차 암모늄염을 가열하여 덜 치환된 알켄을 생성하는 유기 화학 반응.
A class of organic chemical reactions including the elimination and rearrangement of amines or amides to form different nitrogenous compounds or alkenes.
예문:
"The Hoffman elimination reaction typically yields the less stable alkene as the major product."
"Students must understand the mechanism of the Hoffman rearrangement to master nitrogen-containing compound synthesis."