Background:The uropygial gland is an exocrine gland located above the tail of birds that produces a diverse range of biochemicals.It has been hypothesized to be involved in chemical protection,water-proofing and maint...Background:The uropygial gland is an exocrine gland located above the tail of birds that produces a diverse range of biochemicals.It has been hypothesized to be involved in chemical protection,water-proofing and maintenance of plumage brightness.Although these not necessarily mutually exclusive functions have received some empirical support,there has been little empirical research on the function of water-proofing.Methods:Here we analyzed data for 229 individual eiders(Somateria mollissima)collected by Danish hunters during 2016-2018.Results:The Eider is a sea-duck that spends almost its entire life in sea water emphasizing water-proofing of the plumage.The size of the uropygial gland increased with body mass in males,but not in females,and it increased with age.The size of the uropygial gland decreased during winter. Eiders with small uropygial glands grew their feathers at a fast rate.Eiders with large wing areas had large uropygial glands. Conclusions:These findings are consistent with large uropygial glands playing a role in water-proofing during molt and foraging, but also that uropygial glands may play a role in chemical defense.展开更多
Dr. Leslie Ungerleider, who together with Mortimer Mishkin established the model of ‘‘two functionally dissociated cortical visual pathways in the primate brain’’[1], passed away on December 11, 2020. Ungerleider...Dr. Leslie Ungerleider, who together with Mortimer Mishkin established the model of ‘‘two functionally dissociated cortical visual pathways in the primate brain’’[1], passed away on December 11, 2020. Ungerleider’s model of two visual pathways is one of the most profound and influential theories in contemporary neuroscience.展开更多
When the nights with frost are nippy’And the leaves are rusty red,And the gobbler’s getting sassy,Cause he,5 being overfed;When the kitehen 15 50 eozy3And it’5 redolent’with sPiee,And there,5 pumpkins round and
文摘Background:The uropygial gland is an exocrine gland located above the tail of birds that produces a diverse range of biochemicals.It has been hypothesized to be involved in chemical protection,water-proofing and maintenance of plumage brightness.Although these not necessarily mutually exclusive functions have received some empirical support,there has been little empirical research on the function of water-proofing.Methods:Here we analyzed data for 229 individual eiders(Somateria mollissima)collected by Danish hunters during 2016-2018.Results:The Eider is a sea-duck that spends almost its entire life in sea water emphasizing water-proofing of the plumage.The size of the uropygial gland increased with body mass in males,but not in females,and it increased with age.The size of the uropygial gland decreased during winter. Eiders with small uropygial glands grew their feathers at a fast rate.Eiders with large wing areas had large uropygial glands. Conclusions:These findings are consistent with large uropygial glands playing a role in water-proofing during molt and foraging, but also that uropygial glands may play a role in chemical defense.
文摘Dr. Leslie Ungerleider, who together with Mortimer Mishkin established the model of ‘‘two functionally dissociated cortical visual pathways in the primate brain’’[1], passed away on December 11, 2020. Ungerleider’s model of two visual pathways is one of the most profound and influential theories in contemporary neuroscience.
文摘When the nights with frost are nippy’And the leaves are rusty red,And the gobbler’s getting sassy,Cause he,5 being overfed;When the kitehen 15 50 eozy3And it’5 redolent’with sPiee,And there,5 pumpkins round and
