It's #DBIOtweetorial time! Your host, Wallace Marshall. Welcome to 10 Crazy Things Cells Do. We hope to get you thinking about the complexity of cells + challenges in learning physical principles that underly cell behavior. Let's get started! #EngageDBIO#XtremeCellBiology.
Cells can be really big. Many cells are small, but some are gigantic. Each little "plant" in this picture is a single algal cell, Acetabularia, more than 10 cm long. What determines the size of cells? bmcbiol.biomedcentral.com/articles/10.11…
Cells can walk. You think of cells creeping along on a glass slide, but cells can move in more complex ways. @BEuplotes studies cells that can walk using 14 tiny feet. biorxiv.org/content/10.110…
Cells can go left. Humans + other animals show clear left-right asymmetry. Arises from asymmetry of amino acids from which we are built. Molecular asymmetry of life --> when cells are put in uniform chemoattractant, they tend to polarize and move left. pnas.org/content/104/22…
Cells can steal organelles from other cells. Some sea slugs can photosynthesize by stealing chloroplasts from other cells, and putting them inside their own cells, a behavior called kleptoplasty. elifesciences.org/articles/64057
Cells can break into pieces. Under stress, some cells break into tiny pieces called cytoplasts or microplasts. Although missing all organelles, microplasts still move and even chemotax. jlb.onlinelibrary.wiley.com/doi/epdf/10.10…
Cells can sense electricity. We think about cells following chemical signals or light, but electric fields? Yes! Galvanotaxis is important for cells to heal wounds in epithelia. pubmed.ncbi.nlm.nih.gov/23541731/
Cells can solve mazes. We know cells can make simple decisions, but the giant amoeba Physarum can solve computationally hard problems like finding the shortest path through a maze. nature.com/articles/35035…
Cells can see. Many cells can sense light, but some predatory dinoflagellates have evolved camera-like eyes complete with lens. Can they see shapes, or maybe distance to a target? pubmed.ncbi.nlm.nih.gov/25734540/
Cells can explode. About the most extreme thing you can do is explode. Cells of the fungus Magnaporthe build a rigid wall, fill up with osmotically active molecules, and then explode like a bomb to punch a hole in plant cell walls. plantcell.org/content/19/8/2…
Huge thanks to the #EngageDBIO team for making this #DBIOTweetorial possible! We hope you enjoyed hearing about the crazy things cells can do, and will think about how these behaviors are generated by molecules. DM me with your thoughts @WallaceUCSF
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Hello, it’s a gorgeous Thursday! Time for a #DBIOtweetorial by Eleni Katifori, commissioned by the awesome folks at #engageDBIO! Let's get sciencing!
Large organisms cannot survive without a circulatory system. Diffusion is too slow to provide enough nutrients. For this reason, plants, animals and fungi have evolved complex irrigation systems.
Circulatory systems roughly follow some simple design principles. They are composed of wide vessels, “highways” for long distance transport, and smaller, distributary channels, which do the actual delivery of the load. Similar function can result in similar design!
It is Thursday, must be time for a #DBIOTweetorial, brought to you by @NavishWadhwa and Yuhai Tu. We will drop in the tweets over the next hour or so. Counting on you to comment, ask questions, have discussions…let’s show the world that biophysicists don’t hold back. #EngageDBIO
Gather up, friends. Did you see the internet-famous structure of the bacterial flagellar motor? Did it make you want to know more? Then buckle up, we are about to take a deep dive into nature’s most marvelous bio-nanomachine.
First, a quick recap. Many bacteria swim by rotating helical flagella. Rotation of these flagella is powered by a highly complex bio-nanomachine, the flagellar motor. It is a full-on electric motor, complete with a stator, a rotor, a driveshaft, a universal joint, and bushings.
An organism’s genome encodes the rules for how it looks, grows, and responds to the environment in a series of “A”s, “C”s, “G”s and “T”s:
The genes encode proteins – molecular “parts” that assemble into cellular systems. For example, we often depict proteins in metabolism as lines that interconvert chemical species inside the cell. These diagrams contain a lot of information, but can be difficult to understand.
On a first glance, bacterial cell division may seem simple. In reality, it is the culmination of precisely orchestrated interplay between cytoplasmic and extracellular processes. #EngageDBIO#DBIOTweetorial
To divide, bacteria must: grow, replicate and segregate their chromosome, add new cell wall perpendicular to the old cell wall, and separate. That’s a lot of work! #EngageDBIO#DBIOTweetorial
@taekjip is taking over @ApsDbio today to run a tweetorial titled 'single is good but a couple is better'.
Single molecule methods are allowing direct detection of subpopulations & dynamics, and correlation between multiple observables, with rapidly rising popularity. Technical milestones in single molecule fluorescence can be seen here.
Many flavors of single molecule methods. (1) fluorescence (2) mechanical (3) electrical & (4) in silico. All four have been honored by Nobel prizes in physics, chemistry and physiology.
It’s Tweetorial Thursday, so time for a #DBIOtweetorial, brought to you by the fantastic #engageDBIO team! Guest this week @SulianaManley, on why there is “No free lunch in microscopy”
For biophysicists, microscopy is a major tool and an exciting outlet for innovation. If you are a microscopy user more than a developer, it can seem like a major new method is published every week! Even just considering localization microscopy ...
So, how do we make sense of all this method development, and what is driving it? Sometimes developers chase world records in spatial resolution, temporal resolution, depth, or long-term imaging.