标签 生物 下的文章

房子重要还是传宗接代重要

Hermit Crab Equipment

"So, I never really thought I'd study penis size, but I sort of stumbled on this topic." Mark Laidre, a biologist at Dartmouth College. Laidre travels to Costa Rica to study hermit crabs, a species called Coenobita compressus. These land crabs do some interior remodeling of their adopted shells: they extensively hollow them out, removing struts called spiral columella, to give themselves some extra elbow room. The renovation renders the shells more precious to their owners - and to other covetous crustaceans as well.

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小心单糖杀死益生菌

Sweets & Gut Bugs

We all know that stuffing our faces with sweet treats is not good for us. In part because it’s bad for the health-promoting bacteria that inhabit our intestines. Now, researchers have figured out how simple sugars wipe out a particular strain of beneficial gut microbes.

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饥饿素

Ghrelin

This is the season for overeating, but it's not just your lack of willpower or the omnipresent holiday treats. No, you can lay some of the blame on ghrelin. Because a new study shows that ghrelin, the hormone that makes you hungry, also makes food smell irresistibly appealing. The finding appears in the journal Cell Reports.

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一草一虫一世界

Aphid Cowboys

Imagine you're an aphid, a tiny insect that sucks plant sap for a living. You're munching away when a cow comes along to munch on the same plant you're on. You feel its warm breath. So you drop to the ground to avoid being eaten and run away. The ground is a scary place for an aphid, but it's better than a cow’s mouth. But if you're an especially small, young aphid, also known as a nymph, scampering over cracks, stones and twigs is really difficult.

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