Salamander

  • 440 Posts
  • 1.4K Comments
Joined 3 years ago
Cake day: December 19th, 2021
  • SalamanderAtoAsklemmy@lemmy.ml•How does the profanity filter work?
    3·
    10 hours ago

    The “Slur filter” is a server setting. The filter makes use of a “regex” (a text matching algorithm) to automatically remove any text that matches those words. An admin needs to explicitly set the rules for that regex. The regex does not take language into account, it is a simple text matching algorithm.

    The box is in the Admin settings page and looks like this:

    I know that lemmy.ml makes use of a strict set of regex rules. The translation of the french word for “late” matches an ableist slur in English, and so it is removed by lemmy.ml. I am not sure about whether you can check regex for each individual server, but I believe that most instances don’t filter that specific word out.

    EDIT: Ah, I found out how to check the regex. You can check an instance’s regex by going to the the URL https://{instance}.{TLD}/api/v3/site and looking for “slur_filter_regex”. For example, for lemmy.ml you would go to:

    https://lemmy.ml/api/v3/site

  • SalamanderAtoHouseplants•UV light in bedroomEnglish
    3·
    11 hours ago

    If you don’t mind sharing, please do!

    I looked a bit more into it and discovered that some people do use UV lights for inducing stress responses on plants. Most of what I found is from cannabis growing communities that make use of the UV light to increase the potency of the plant. I don’t know how effective that is, but that did signal to me that some shops might sell UV lamps as grow lamps.

    An example of a specific lamp I could find is the MIGRO UVB 310. If you follow that link and look through the images you will see that the bulb is clearly labeled with “UV BOOST”.

    These lamps are meant to be used as supplemental inputs to stress the plant. It is not very likely that you ended up with such a lamp by mistake as it is still a niche type application. But it is good that you are making sure.

  • SalamanderAtoHouseplants•UV light in bedroomEnglish
    14·
    2 days ago

    Does the bulb have some model written on it? If you tell us the specific model we may be able to find the properties of that light.

    There is a good chance that you do not have a “UV lamp” but instead a purple grow light that does not emit a lot of UV. The purple grow lights have an emission that is tuned to the regions of the spectrum for which green plants absorb the most light - so, the lamp emits mostly in the blue and red, which is why they look purple. There is no need to worry about that light, it is perfectly safe.

    If you do have a UV lamp and are using that lamp for a plant: Then we really do need more information to estimate the level of risk. Chances are that, if that UV lamp is harmful to you, it is also harmful to the plant, and it is better to swap it for some other type of lamp.

    It is not very likely that you are using a one of the more dangerous UV lights - like a mercury-vapor lamp with a quartz bulb - which will produce smelly ozone and can burn your eyes if you stare at them. Those lamps tend to be specialized items that you are unlikely to end up with by mistake. More common lamps would be the blacklights with common variants that produce 365 nm or 395 nm light. Continuous direct exposure of moderately intense 365 nm carries a low risk inducing skin cancer and is better to avoid. 395 nm is relatively safe but I would still not want to expose my skin continuously to it as it may still cause oxidative stress to the skin. These are used ornamentally for making things glow, but they are not the best choice for plants.

  • SalamanderOPMAtoReptiles and Amphibians•The common milk frog (Trachycephalus typhonius)
    5·
    4 days ago

    Good question. The green pigment is biliverdin, which is a product of the breakdown of heme. But more specifically I am not quite sure, I’ll have a look.

    I have found this open access article from 2020:Taboada, Carlos, et al. “Multiple origins of green coloration in frogs mediated by a novel biliverdin-binding serpin.” Proceedings of the National Academy of Sciences 117.31 (2020): 18574-18581.

    This article goes into more specificity about the protein that binds the pigment and allows it to become concentrated inside of the body and bones. In this article they point out that green is a difficult pigment to make using vertebrate biochemistry. Multiple frogs have evolved in parallel this mechanism to sequester the green biliverdin within the body, develop a translucent skin, and become green this way (for camouflage).

    However, the common milk frog is not very green. It could be that the biliverdin-binding protein is a trait that is derived from an ancestor and is now vestigial. In the cited article, near the end, they do include a section “Other BBSs Functions”. In this section they point out that some frogs with green bones do not look green, and suggest that the protein could be involved in inflammation pathways and behave as an anti-oxidant. But nothing conclusive.

    I quickly skimmed for other recent papers but I can’t find anything conclusive.

  • SalamanderAtoESP32@lemmy.ml•What is your current ESP32 side-project?
    2·
    10 days ago

    It’s for hobby!

    But I did work with cell cultures (with lab-grade incubators) in the past, and I am currently working with a company developing sensors for industrial systems. So, the concept of PID I learned at work recently. And at work I also write some firmware for interfacing sensors with micro-controllers.

  • SalamanderAtoESP32@lemmy.ml•What is your current ESP32 side-project?
    2·
    11 days ago

    I have built incubators for several different projects (seedlings, mushrooms, tempeh, fermentation, etc…). Learning how to control a heat distribution in a safe and efficient manner has been a bit of a journey for me. Just recently I begun experimenting with positive temperature coefficient (PTC) heaters and I am very happy with them as I feel much safer running these than ceramic/IR heat lamps and regular heating elements.

    At the moment I am heating an incubator for petri dishes using a 12V/100W PTC heater with a fan hooked up to an stc-3008 thermostat. The PTC undergoes on/off cycles that keep the temperature near 26 C, but, even when setting the upper and lower control limits quite tight, the temperature still oscillates up to +/- 2 C during these cycles.

    I have been studying how to implement a proportional–integral–derivative (PID) controller to avoid the on/off cycles. My next experiment is to try to control the power of the PTC with a Mean Well HLG-120H-12AB LED-driver in constant-voltage mode and the ESP32 as the PID controller.

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