Peronella lesueuri - a beautiful sand dollar of importance in coastal ecosystem processes
The striking Peronella lesueuri (Clypeasteroida - Laganidae), is a large sand dollar up to 15 cm in diameter, with a wide Indo-Pacific distribution. The most noticeable and amazing feature of this species is its bright pink when alive, hence its common name of Pink sand dollar.
It is a shallow burrower and occurs at densities which may influence surface sediment chemistry and community dynamics. Therefore, knowledge of seasonal and diet movement rates and rhythms of this species are a key of interest in understanding coastal sediments biogeochemical dynamics.
Live Sand Dollars. Most people probably don’t realize that sand dollars are not those bone-colored shells that we are all used to seeing. They are a type of starfish that’s fuzzy, and in the case of these, with a slight purple tint. They sit at all angles on the bottom of the ocean. What we normally see is the outer shell after the fuzz has died off and left nothing but the skeleton.
Tiny starfishes I captured in the aquariums of Artis Royal Zoo, Amsterdam
- If you like someone, wait.
- Give lots of compliments, even if you’re shy. Everyone else is too.
- Change. Get a haircut, try new perfume, get new sheets. Become better than you were before.
- Eat healthier. Learn to cook something fancy.
- Get up earlier and watch the sun come up.
- Wear soft clothes, take a bath, drink something warm.
- Meet someone new, even just a friend.
- Become closer with your friends and your family. Call your mother. Cry with your best friend. Tell everyone how much you appreciate them.
- Keep your room clean. Buy some candles. Let the natural light in.
- Make a list of reasons why you’ll be better off without them. Believe they are true, because they are.
- Listen to new music.
- Write everything you’re thinking and feeling. Write letters. Write happy letters, sad letters, and angry letters, even if you’re never going to send them.
- It’s okay to be sad, but not forever. Sadness is not as beautiful as music makes it seem. Lack of sleep makes your eyes droopy, not deep. Wake up every morning and tell yourself you’re going to have a good day.
- Go to the library. Don’t forget to look in the music section.
- Remove them from your life. Get rid of the things they gave you if they make you sad. They’re not worth it. You will never be happy if you continue to hold on to the things that make you sad.
- Make new memories.
- Try to find something to appreciate in everything you do or experience.
- Being alone is okay, you don’t have to surround yourself with people.
- Become your own best friend. Buy yourself coffee and drink it alone in a cafe. Take your time.
- Learn to love every bit of yourself.
Fibroblasts are cells that help maintain tissue structure by secreting proteins like collagen and elastin. Because they are easy to acquire and maintain in a laboratory, fibroblasts are one of the most common starting points for induced pluripotent stem cells (iPSCs), which are adult cells like fibroblasts that have been coaxed to return to a very early stem cell state. iPSCs have the potential to become almost any cell in the human body, making them prime candidates for regenerative medicine, but creating them is incredibly inefficient. To help generate iPSCs, recent research has looked towards separating out iPSCs based on how adhesive they are compared to other cells. In this image, fibroblasts (magenta) express a cell adhesion protein (green), which can be used to determine differences in stickiness between cells.
Image by Dr. Ankur Singh, Cornell University.
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