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056 - Deep sea fish opsins.

Recorded: 2019-05-27
Duration: 35'


Topics:[0030] Intro. [0100] It's been a long time. Last podcast was in December. Changes in scheduling. Busy with ARDF. [0200] Fun article noticed. [0255] Overview. May 10 issue of Science, page 588. Also has perspective. Musilova et al. Vision using multiple distinct rod opsins in deep-sea fishes. Vertebrate opsins. [0520] The usual visual process. Retinal. The opsins with different amino acid sequences. Wavelength sensitivity. [0720] Cave dwellers. [0820] What they found. Stacked rod cells. Extra long rod cells. Anatomy. [1000] It's difficult to get deep sea specimens alive to the surface. Kelly trips on boats, with geologists, with students dredging along the coast. [1130] Genetic sequencing of fish. The amount of light 1000 m below surface. Wavelengths in blue and green range. [1310] Sparse life in the deep sea. Finding a mate, finding food; competition. [1450] The four special species. Lost short and long wavelength options. Gene duplication. Many families of fish. Lanternfish, tube-eye, two spinyfins. RH1 duplication. Lanternfish 5 RH1, tube-eye 6 RH1, two spinyfins 18 and 37 RH1. [1740] Twentyfour mutations in RH1. Molecular modeling. The wavelength bands RNA transcription. Sensitivities with a different shifted max for all the different options. Just trying to get every photon or trying for color vision? Figure 2, overlap in sensitivities. Stacked rod receptors. For bioluminescent flashes, there may be more photons. [2320] Thicker rod layers at the bottom of the eye, pointing toward surface. Silhouettes. First column on last page of article, different possible explanations for finding. Developmental changes. [2510] New volcano article. Science, May 24, news. French research cruise. Seismographs. Five cubic kilometers of magma put out on ocean floor. Large fish kills. [2750] Rocks brought to the surface making noises, depressurizing. Cause unknown. Plate movement? Hot spot? Near-bye island sunk and shifted. [2950] Things we've done. School ARDF season is finished. Out every weekend. Events every other weekend. The electronic course timing system. Increased competition and excitement. Run or walk, it's all good. [3140] Interruption. [3210] It was a good school ARDF season. High school students. [3250] Next event. BOK, 2m. No Bear Island this year. Hurricane Florence. Canaan Valley instead. Maybe a SOTA activation. Maybe some climbing. [3420] Outro.

057 - Amber fossils.

Recorded: 2019-07-02
Duration: 36'


Topics:[0020] AAAS Science 2019 May 24, news feature. [0130] Xing Lida, paleontologist in China Also Science, 2017 June 23. [0420] Cretaceous. Amber mines. Soft tissue details preserved. [0630] Quantity of organisms from Tanai, Myanmar. Prehistoric spiders, spinerets. Insects, flowering plants, gymnosperms, pollination by wind or insects. Quantity and size of amber pieces from Tanai. [1250] Other locations where amber is found. History from ancient times. Blue crust. Weathering in the ocean. Electron. [1620] More recent history. Kachin state in northern Myanmar. Separatist forces. Myitkyina, Myanmar, Tengchong, China. Export jewel legal loop hole. Mines going straight down. [2150] Collectors. The price of amber. Scientists collaborating with collectors. Using cell phones to send pictures and to buy amber. Dating the amber, ash. [2500] Publishing results from samples that are in private collections. [2540] Feathers from normal fossils versus fossils in amber. Feather shaft as tube. [2750] Synchrotron, X-ray imaging. [2910] Fake Turtle, fake. Bell shaped mines. [3140] Future plans. Bear Island is not happening this year (Hurricane Florence damage). Canaan Valley, WV, first time in summer. SOTA activation, maybe. ARDF Championships. [3400] Outro. Course timing system. Has been used for one season. Final form with raspberry pi as WAP, coming soon.

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Intro and ending music adapted from "Low Battery Blues" by Martijn de Boer (NiGiD) (c) 2014 Licensed under a Creative Commons Attribution Noncommercial (3.0) license.