\nWhat’s different in their guts?\nDigging deeper, the researchers identified specific changes that occur in the composition of the gut microbiome of mice as they age. In particular, the relative abundance of a bacteria called Parabacteroides goldsteinii increases in old mice and is directly associated with cognitive decline in the animals. They showed that colonizing the guts of young mice with this bacterial species inhibited their performance on the object recognition and maze escape tasks, and that this deficit correlated with a reduction of activity in the hippocampus.
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about some problem when I happened to read a paper
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近年来，尽管地方各级政府已陆续出台了一些针对新就业形态的改革举措，但在周世虹看来，现实中的制度障碍仍然不少。例如，一些新业态从业人员在参保时仍会受到城乡、户籍等因素限制；同时，基本养老保险的缴费比例相对较高，增加了从业者负担。此外，工伤保险和失业保险在不少情况下仍难以覆盖这一群体，可享受的社会保障补贴政策也相对有限。
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