In December 2025, Nature Neuroscience published a paper about optogenetics. Panel A and B (right): The paper demonstrated a miniaturized, fully implantable transcranial optogenetic neural stimulator, which is shown to the right in panel A. The implanted device is shown in panel B.     Panel C (right): A virus (AAV9) was used to deliver an opsin transgene to the brains of mice. The transgene was a Channelrhodopsin (ChR) gene fused to a fluorescent tag gene (FT). The ChR-FT transgene was driven by a pan-neuronal promoter (PNP).   Panel D (right): Gene expression confirmed that when the lights on the stimulator were switched on, neurons in the mouse brain fired action potentials. The left column shows neurons that are expressing the fluorescent tag (FT). The middle column shows neurons that are expressing a reporter for neuronal activity. The right column is a merge of column 1 and 2.   The expression of which gene could (and was) used as the the neuronal activity reporter in the middle column? Choose the best answer: Which set of panels shows cells when the light is on, or has very recently been on?

Who is responsible for formally approving organizational policies?

Indirect conversion scintillators are made of?

Which of the following are TRUE of radiograph grids?     1. should be used on chests that are thicker than 26cm     2. using high ratio grids will increase patient dose     3. has interspace material made of lead

What is the minimum beam filtration required for fluoroscopic equipment?

What does the photocathode of the image intensifier do ?

NCRP regulations require a source-to-skin distance for fixed equipment of at least:

The abbreviation SSD stands for?

Proper use of which device listed below would not decrease patient dose?

The input phosphor of the image intensifier is made of?