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OHHHHH this is so cool! He looks absolutely amazing! Thank you so much!

@gatortavern

Hooray! It's always a blast to discover more jurassic species! And this one's a crocodile ancestor!

Jurassic-Period Crocodile Ancestor Unearthed in Chile

http://www.sci-news.com/paleontology/burkesuchus-mallingrandensis-09929.html

#crocodiles #cool shit!

New Evidence Suggests Ancient Crocodiles Swam From Africa to America

https://sciencespies.com/news/new-evidence-suggests-ancient-crocodiles-swam-from-africa-to-america/

New Evidence Suggests Ancient Crocodiles Swam From Africa to America

Most American crocodiles don’t need to look far to find the feature that sets them apart from Nile crocodiles. The difference lies right between their eyes and their nostrils. Of crocodiles living today, only the four crocodile species that live in the Americas have a small bump in the middle of their snouts.

But about seven million years ago, a ten-foot-long crocodile living in what’s now Libya had the same tell-tale lump, according to research published in Scientific Reports last week. A fossil skull of the extinct Crocodylus checchiai provides more evidence that crocodiles spread across the world by migrating from Australia, through Africa and finally to South America.

The fossil “fills a gap between the Nile crocodile in Africa and the four extant American species,” University of Turin paleoherpetologist Massimo Delfino says to Science News’ Carolyn Wilke.

The fact that crocodiles live on both sides of the Atlantic Ocean has long puzzled biologists trying to figure out which direction the giant reptiles migrated. Genetic research in 2011 provided molecular evidence that crocodiles migrated from Africa to the Americas, but fossil evidence was scant.

“The main problem for palaeobiologists is the rarity and fragmentary nature of fossil remains,” Delfino and co-author David Iurino told the Agence France-Presse by email.

The seven million-year-old Crocodylus checchiai skull was first collected in 1939.

(Image by Bruno Mercurio)

The fossil described in the new paper is one of four that were first described in the 1930s. Three that were stored in the Natural History Museum in Tripoli, Libya, were lost or destroyed during World War II, according to the Scientific Reports paper. But the researchers found the fourth skull, originally collected in 1939, stored in the Sapienza University of Rome.

“This fossil is twice-old,” Delfino tells Nina Pullano at Inverse, referencing the fact that the skull is millions of years old and had then been forgotten for decades.The researchers used CT scanning to create a 3D model of the inside and outside of the skull for closer study and confirmed the presence of the American crocodile-like snout bump.

At seven million years old, the C. checchiai skull predates all known crocodile fossils in America, the oldest of which are about five million years old, Lucy Hicks reports for Science magazine. That means that the timeline checks out: it’s possible that C. checchiai may have made their way from Libya to the western coast of Africa, swam across the Atlantic and landed on the shores of South America.

The continents were about the same distance apart seven million years ago as they are today, making the journey across the ocean quite a feat—but not impossible. The researchers point out in a statement that the Australian marine crocodile has been recorded travelling more than 300 miles in a day. The prehistoric croc may have also bobbed along on one of the ocean’s surface currents that travel west from Africa to the Americas.

Crocodiles are also not the only flightless animal thought to have reached the New World by crossing the Atlantic. As the Inverse reports, a study published in April suggests that on two instances, monkeys made their way across the ocean on floating vegetation.

“If you think that the monkey can cross the Atlantic Ocean, very probably it’s much easier to accept that the crocodile can do it,” Delfino tells Inverse. Ancient crocodiles had the specialized glands necessary to swim and survive in saltwater and may have snacked on sea turtles along the way.

As a changing climate wiped out local species, crocodiles were well adapted to the late-Miocene environment and replaced them, the researchers write in the paper. The original crew of ocean-crossing crocs may have included many individuals or at least one pregnant female, Science News reports.

And after situating themselves in South America, they evolved and diversified into the four species found in the Americas today. (Only the American crocodile and American alligator are found in the United States.)

But whether or not the crocodilians mourn their C. checchiai ancestors is hard to tell—they might just be crocodile tears, after all.

#News

#crocodiles #science #cool stuff! #some crocs will totally still eat fruit #it’s rather fun to see them chomp down on a mango

Ancient crocodiles may have preferred chomping plants, not meat

Fossil teeth of ancient crocodilians suggest that some ate plants and that such green diets evolved in crocs at least three times more than 60 million years ago.

Some extinct crocs may have been salad eaters.

Studies of fossil teeth suggest some ancient kin of modern crocodiles ate plants. These ancient plant-eating crocs evolved at least three times during the Mesozoic Era. This era stretched from about 252 million to 66 million years ago. Researchers reported their findings June 27, 2019 in Current Biology.

Today’s crocodiles eat mostly meat. Their simple, cone-shaped teeth are typical of meat eaters. Those teeth were different in certain of their ancient relatives. There was “tremendous diversity [in tooth shape] that we don’t see today,” says Keegan Melstrom. This paleontologist is a coauthor on the study. He works at the University of Utah and Natural History Museum of Utah. Both are in Salt Lake City.

Some of these are inviting, in their own odd way. Some of these faces seem as if the person is turning to you with the words "can you believe what's going on here?" about to leave their lips. The gentleman staring gives off a "sitting on the subway train longingly gazing out the window, thinking of love" vibe.

I fucking hate James Tissot’s paintings because in ALL OF THEM there is ALWAYS someone staring right at you, but it’s not always immediately visible. You just feel watched by this mf. Sometimes the little shit is right there at the centre, but others the bastard is just gazing from the distance, it is CREEPY, my guys

oh heyyy! It’s back baby!

Well, hello dearest Paranatural fandom! 

The Paranatural Secret Santa 2020 is finally open for applications!

A time for joy, the secret santa has run since 2015 (on two separate blogs), and this holiday season it comes with a new, fancy look. Sleeker, shinier, sexier, i-can’t-think-of-another-adjective—-!

I hope to welcome back some old participants again, it’s always a pleasure to work with y’all but for the uninitiated:  

What’s a secret santa?

A secret santa is a gift exchanging event where you’re assigned a person to make a gift for, and another assigned to make a gift for you. Art, fic, edits, videos, playlists, we’ve had some music composition, anything you can make goes!

Here’s our schedule:

November 1st - November 22nd: Applications are open

November 23rd - November 25th: Applications close, Secret Santas are assigned.

November 26th - December 24th: Make Your Gifts!!

December 25th - January 1st: Posting span.

Still having some doubts? You’re unsure of some things? Check out the FAQ for all of the common questions. Don’t see your particular question? The askbox is always open, I’ll answer as quickly as possible.

Lastly, if these ramblings have convinced to you participate, you can join by filling out this form or submitting the template to the blog.

I’ve gone on for long enough, so, have a nice day and stay safe!

Exploring the Marvels of Biological Macromolecules: The Molecular Machinery of Life (Part 3)

Proteins and Enzymes: Catalysts of Molecular Reactions

Proteins are the central players in macromolecular interactions. Enzymes, a specialized class of proteins, catalyze biochemical reactions with remarkable specificity. They bind to substrates, facilitate reactions, and release products, ensuring that cellular processes occur with precision.

Protein-Protein Interactions: Orchestrating Cellular Functions

Proteins often interact with other proteins to form dynamic complexes. These interactions are pivotal in processes such as signal transduction, where cascades of protein-protein interactions transmit signals within cells, regulating diverse functions such as growth, metabolism, and immune responses.

Protein-Ligand Interactions: Molecular Recognition

Proteins can also interact with small molecules called ligands. Receptor proteins, for instance, bind to ligands such as hormones, neurotransmitters, or drugs, initiating cellular responses. These interactions rely on specific binding sites and molecular recognition.

Protein-DNA Interactions: Controlling Genetic Information

Transcription factors, a class of proteins, interact with DNA to regulate gene expression. They bind to specific DNA sequences, promoting or inhibiting transcription, thereby controlling RNA and protein synthesis.

Membrane Proteins: Regulating Cellular Transport

Integral membrane proteins participate in macromolecular interactions by regulating the transport of ions and molecules across cell membranes. Transport proteins, ion channels, and pumps interact precisely to maintain cellular homeostasis.

Cooperativity and Allosteric Regulation: Fine-Tuning Cellular Processes

Cooperativity and allosteric regulation are mechanisms that modulate protein function. In cooperativity, binding one ligand to a protein influences the binding of subsequent ligands, often amplifying the response. Allosteric regulation occurs when a molecule binds to a site other than the active site, altering the protein's conformation and activity.

Interactions in Signaling Pathways: Cellular Communication

Signal transduction pathways rely on cascades of macromolecular interactions to transmit extracellular signals into cellular responses. Kinases and phosphatases, enzymes that add or remove phosphate groups, play pivotal roles in these pathways.

Protein Folding and Misfolding: Disease Implications

Proteins must fold into specific three-dimensional shapes to function correctly. Misfolded proteins can lead to Alzheimer's, Parkinson's, and prion diseases. Chaperone proteins assist in proper protein folding and prevent aggregation.

References

Voet, D., Voet, J. G., & Pratt, C. W. (2016). Fundamentals of Biochemistry: Life at the Molecular Level. Wiley.

Lehninger, A. L., Nelson, D. L., & Cox, M. M. (2017). Lehninger Principles of Biochemistry. W. H. Freeman.

Berg, J. M., Tymoczko, J. L., & Stryer, L. (2002). Biochemistry. W. H. Freeman

The merit of your writing.

So, you’ve read something that has resonated with you. It’s everything you’ve wanted in terms of characters, prose, plot and pace. It’s the best you’ve read in years. You reread your favourite lines. You have to take a break just to absorb every meticulously crafted line. You are in awe of how something so small can seem to take up so much space.

And in a perfect world, it would inspire you to go out and create. To work on that story that is languishing in your save files, to pick up that WIP you abandoned, to make you want to write something different and new and better. 

Instead, it makes you feel inferior. The words are too good. You could never write like that. The characters are too perfect. You don’t have that insight. The story is too captivating. Your ideas are boring, cliche, plain. The insight is remarkable. You can barely string a thought together coherently. 

Why even bother, you think.

Don’t fall into that trap. I have been there so many times. I have abandoned writing for years because of “why even bother”. I have let it destroy my confidence, only to patch it back up in a cheap imitation of what it once was, just to let it invade my thoughts again. I have questioned every thing I’ve written, every choice, every line, because why even bother if someone is so much better. 

YOUR WRITING HAS MERIT. What you don’t realize is that it’s not in terms of better, but different. Different style, different story, different interpretation, different mind.

Someone out there will love the way you describe the night sky in poetry. Someone out there will love the way you describe the look on someone’s face when their heart breaks. Someone out there will love your idea, that strange one that seems impossible or already done, because it’s new and exciting or they love endless amounts of that same story. Someone out there will love your interpretation of that character, whether more gentle or bitter or broken or healed. Someone out there will love the words you write, the grandiose use of adverbs (my guilt) or the minimal scattering of dialogue. Someone out there will love your abundance or lack of something you saw in that story you so loved, the one that rendered you speechless and snuffed out your fire. 

Someone out there will love your words. And you need to share them. 

Speaking as a writer, no one sets out to create something to discourage others. No one wants to dominate their corner and be the only one there. No one wants to be alone in their craft. If they do, they are doing it for the wrong reasons. Speaking as a writer, I would never want you to read my writing and think, why bother. 

I want you to think, why bother waiting?

Your story matters. Your writing matters. It’s beautiful and defined and gorgeous and a work in progress and growing and already there and insightful and mysterious: it all has merit. 

Never stop. Never stop writing and practicing and doing and creating and learning and loving the words you weave.

You may think someone has done it more beautifully or better or too many times or never because who wants to read it? 

They maybe have done all those things, but they lack one thing: they haven’t done it like you have.

Big-headed turtle Platysternon megacephalum (or big headed turtle) is a very odd-shaped turtle with a huge head and a long tail that are almost the same size as its body.