Mangrove box jellyfish (Tripedalia cystophora) is a small species of box jellyfish, native to the Caribbean Sea and the Central Indo-Pacific, presenting a simple nervous system. But despite tiny, researchers have demonstrated present the ability to learn by association. Although has no central brain, and being the size of the finger-tip, this box jelly can be trained to associate the sensation of bumping into something with a visual cue, and to use the information to avoid future collisions.
In the wild, the Mangrove box jellyfish forage for tiny crustaceans between the roots of mangroves. To mimic this environment, researchers placed the box jellies in cylindrical tanks that had either black and white or grey and white vertical stripes on the walls. To the jellyfish, the dark stripes looked like mangrove roots in either clear or murky water. In the βmurky waterβ tanks, the jellyfish bumped into the wall because their visual system couldnβt detect the grey stripes very clearly. But after a few minutes, they learnt to adjust their behaviour, pulsing rapidly to swim away from the wall when they got too close, this state learning is based on the combination of visual and mechanical stimuli in simple animals with no brain.
The learning process, in difference with vertebrate animals, doesnt occurs in a central neuronal organs, but instead in a small organs named rhopalial nervous system, which act as learning center, in which the jelly combines visual and mechanical stimuli during operant conditioning.
Main image: An adult specimen of the box jellyfishΒ T.Β cystophora., showing where is located one of the four sensory structures named rhopalia, which includes two lens eyes. Each rhopalium also contains a visual information processing center.
Reference (Open Access): Bielecki et al., 2023. Associative learning in the box jellyfish Tripedalia cystophora.Β Current Biology.
Monday december 13
hello my lovelies! sorry for being so absent, the ib has been crushing me haha (laughing to avoid crying) so I have not been able to be active on social media. you know, the future doctor agenda is not quite fun if you ignored biology for three years so I hope you understand <3
school ends in 2 days (thank the gods) so I need to doooo a lot of things.
π§ - indiana (hombres g)
π - chemistry textbook
THINGS I NEED TO DO FOR TOMORROW
finish my presentation of gender roles for spanish
study for my chem final
send emails to my glopol teacher
prepare my microbiology lab
Pterocarpus AngolensisΒ is a tree native to South Africa. Itβs also commonly known as the bloodwood tree due to the fact that when itβs chopped or damaged, a deep red sap which looks eerily similar to blood, seeps from the tree. In fact, the purpose of the sap is to coagulate and seal the wound to promote healing, much like blood.
It's not the best "microbiology" art, but it has a very interesting background. Two bacteria from two different clinical cases were inoculated on the TSCB medium. This metallic blue spilling bacterium is of course Pseudomonas aeruginosa. The yellow one (positive reaction on TSCB medium) is Vibrio metschnikovii isolated from chronic UTI in a dog. It was an unusual microbiological diagnosis. But what can you do when even your dog has a better holiday than you? Problems with urination (in this dog) began just after returning from the Mediterranean, the owners and the dog intensively used the charms of warm and salty water.
In a unique study carried out in drinking water pipes in Sweden, researchers from Lund University and the local water company tested what would happen if chlorine was omitted from drinking water. The result? An increase in bacteria, of course, but after a while something surprising happened: a harmless predatory bacteria grew in numbers and ate most of the other bacteria. The study suggests that chlorine is not always needed if the filtration is efficientβand that predatory bacteria could perhaps be used to purify water in the future. Just as human intestines contain a rich bacterial flora, many types ofΒ bacteriaΒ thrive in our drinking water and the pipes that transport them. On the inside of pipe walls is a thin, slippery coating, called a biofilm, which protects and supports bacteria. These bacteria have adapted to life in the presence of chlorine, which otherwise has the primary task to kill bacteria, particularity bacteria that can make humans sick.
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lil chemistry moodboard for motivation π§ͺπ₯Ό
Back when I asked for some concepts in September on my Instagram, @ sammithyst suggested a mon based on Petrie duals, a term in topology that refers to a loop of edges that can split a 3D shape in half in a certain way. Although that was incorporated into the design of this mon (skew polygon "teeth on each dish"), the name reminded me of Petri dishes.
Petri dishes are shallow dishes with a cover that is used to grow all sorts of cells, like bacteria, fungi, and even human cells. Cells can be grown with the growth medium that is put into the dish, some sort of food like some agarose gel or a liquid mixture of nutrients.
Cantri (Poison/Psychic):Β When dormant, they reside completely inside their dish, only coming out when they run out of the food that dragged in. Despite having many protozoan-like cells in their body, they seem to be resistant to the antibiotics of this world.
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