For example, there is also a sequence of neurulation events along the body axis that involves multi-site, progressive closure (‘zippering’) in mammals, a somewhat simpler sequence of closure events in birds, and almost simultaneous closure at all axial levels in amphibia ( Fig. However, primary neurulation varies between species (see Box 2). 1): the NP is initially induced to differentiate, it then undergoes bending to create the neural folds, which elevate towards the dorsal midline, and finally the neural fold tips fuse to complete the NT. Primary neurulation (see Glossary, Box 1) – the process by which the NT closes from an open neural plate (NP) – is achieved sequentially in distinct steps ( Fig. Vertebrate neurulation is a complex morphogenetic process that requires the coordination of many cellular and molecular events, and is regulated by more than 300 genes in mammals ( Wilde et al., 2014). One day I may try to fully “restore” this unit, but for now, it was a fun way to spent a few hours invegating this weird device.How the neural tube (NT) forms is a central issue in developmental biology. I replaced the bad leads and power connector, but didn’t touch the circuitry. I cleaned up the unit and put it all back together.
Next, I tried the horizontal lines selection. I tweaked the pots and got a clear set of vertical bars, but no color.Īdjusting a bit more started getting color, but the image below is about as clean as I could get it. There were some adjustment pots on the bottom for picture stability and the channel frequency which helped a bit. I didn’t hook this up so I wasn’t expecting a perfect picture. There is a big resistor wired up to a power port on the back to warm up the unit to stabilize the oscillators. I started out on the color bars selection, but I just got some sort of garbage picture at first. Nothing immediately smoked, so I grabbed an old TV and connected it up. I put things mostly back together and tried powering it up. I then hit it with a coat of spray paint to hopefully stop further corrosion. I pulled out the board and soaked the rusty area in vinegar for a bit and cleaned off the rust. The cardboard tubes were a little moldy and there was a good bit of rust in one of the corners. I opened up the case, and you can definitely tell there was some water ingress at some point. The leads were coiled up in a little tube compartment in the back, but when I tried to pull them out, they just started disintegrating. I figured it would be fun to see if it still worked, and if not, see if I could fix it. It was still in the box with the original receipt and manual, but it was a little damp and smelly.
While cleaning out some old boxes in a shed, I found “The World’s Smallest Color Bar Generator” by Sencore.
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