this is in equal part shitpost and an tought i had somethimes :
have you guys noticed how many times there are animals that do a similar task but use different body part to do so ?
for examples : naked mole rats use their theet to dig , while moles use their front paws to dig , while burrowing snakes use their muscular body and a reinforced head to burrow trough the ground
in the same way in wich elephants use their lip/nose ( we could call it trunk but you'll see my point ) to browse , and giant sloths, calicotheres and therizinosaurs (wich btw are an amaizing example of convergent evolution) used their front legs to accomplish this task , giraffes , hiracotheres and sauropods instead lenghetend their neck to reach things
and how wolves and hyenas use their strong jaws to take preys down , while big cats and bear dogs used their paws to restrain the prey , while on the other hand big constrictor snakes use their body to coil around and strangle their prey ,
or sea iduanas and crocodiles using their long tail to swim in turbulent waters , while sea turtles use their legs instead
this could also be seen in speculative evolution : humans use their arms to manipulate tools , while things like the avisapiens use their mouths to manipulate tools ,
this is because there are mainly three parts of the skeletal structure of tetrapods : the neural spine , the skull and the jaws , and the legs ,
these three structures can be used to create different results and can all be functional ,
this is i guess was kind of the opposite of convergent evolution : similar creatures using different strategies to do the same thing , and sometimes converging with species wich are completely different from them ...
idk honestly what is the point of this post i just wanted to point out somenthing i notice ofthen ,
it's looks like different martial arts almost ...
https://docs.google.com/spreadsheets/d/1hQ_11NL9V0znXb7rRrmcPX1GA6-cFDTRvlk-yWaF1WY/edit?usp=sharing
Here is the culmination of a year's worth of work (off and on) or my phylogenetic tree of Chordates. It's a spreadsheet so it's kind of weird, and it's best viewed at 100% zoom so the lines match up.
A few things about the presentation. almost all cells represent about 5 million years. Each colored blocked is a family, with their length roughly corresponding to their duration. The lines connecting the families and the nodes between them are NOT representative of when the lineages are theorized to have diverged. The family colors are often traditional taxonomic orders or other helpful groupings. They may be paraphyletic but never polyphyletic. A few nodes are labeled with classic and important clades.
I have done extensive research on wikipedia, fossilworks, and any academic papers I could find when those didn't suffice. Many of these relationships are not resolved, and in some cases I had to determine them on my own based on the age and geographical range of families. The phylogeny of fishes is especially unclear at the level of orders.
Where major dispute exist about relationships, I had to make executive decisions based on all the research I done. Notable examples include the Ornithoscelida hypothesis, Lepospondyli-Lissamphibia derivation, a paraphyletic Placodermi with respect to later Gnathostomes, and nestling Testudines as a sister-clade to Archosaurs.
This science is ever..."evolving", and many of these relationships are subject to change. I'd love to talk and discuss about them and what new findings have to say, and explain my choices.
Thanks and have a good day!
Any thing I should watch out for in this class next semester? Any advice you would be willing to share
https://preview.redd.it/gfp2fa4ewct61.png?width=1300&format=png&auto=webp&s=7eee51e62a6d05a768daeabe84da4bde0550971d
https://preview.redd.it/arjfl6tlwct61.png?width=241&format=png&auto=webp&s=734405ad20e17ce4791f24b3e4433eabd168b0a4
Okay on our planet chordates and arthropods are the two land living species the take up the majority of the ecosystem. Yes I know there are snails and some other groups but if you're talking about most land living creature is there mainly either a chordate/tetrapod or an arthropod or something along those lines. Is it possible for there to be more then two main groups of land living creatures? For example if mollusks evolved to be more outside of land before the arthropods did would they have shared more nieces or would it be similar how it is today. Or alternatively could mollusks have taken a couple of the tetrapods niches?
Single-cell mass spectrometry was advanced to enable dual characterization of proteins and metabolites in identified cells in Xenopus laevis embryos. The analyzed embryos developed to normally behaving tadpoles with anatomy and visual function indistinguishable from that of their control siblings in a background color preference assay. In vivo single-cell mass spectrometry expands the analytical toolbox of molecular systems, cell, and developmental biology.
Abstract
We report the development of in vivo subcellular high-resolution mass spectrometry (HRMS) for proteo-metabolomic molecular systems biology in complex tissues. With light microscopy, we identified the left-dorsal and left-ventral animal cells in cleavage-stage non-sentient Xenopus laevis embryos. Using precision-translated fabricated microcapillaries, the subcellular content of each cell was double-probed, each time swiftly (
https://ift.tt/2QaPHNc
https://preview.redd.it/ghkrg23oft651.jpg?width=680&format=pjpg&auto=webp&s=6d4664d7f2e2580438c072f0eaf585ec38bb57a1
Singleโcell mass spectrometry was advanced to enable dual characterization of proteins and metabolites in identified cells in Xenopus laevis embryos. The analyzed embryos developed to normally behaving tadpoles with anatomy and visual function indistinguishable from that of their control siblings in a background color preference assay. In vivo singleโcell mass spectrometry expands the analytical toolbox of molecular systems, cell, and developmental biology.
Abstract
We report the development of in vivo subcellular highโresolution mass spectrometry (HRMS) for proteoโmetabolomic molecular systems biology in complex tissues. With light microscopy, we identified the leftโdorsal and leftโventral animal cells in cleavageโstage nonโsentient Xenopus laevis embryos. Using precisionโtranslated fabricated microcapillaries, the subcellular content of each cell was doubleโprobed, each time swiftly (
https://ift.tt/2QaPHNc
https://preview.redd.it/b216m7lsft651.jpg?width=680&format=pjpg&auto=webp&s=ce86e06f290f30d53d9b42a4295e470c7a97de3b
