The dorsoventral polarity of Drosophila egg is established by means of signaling between the germ line-derived oocyte and the surrounding somatic follicle cells.
Keto-enol tautomerizing of ethyl acetoacetate was studied by UV.It was conformed that the content of enol ethyl acetoacetate decreased with the increasing polarity of solvents.
Paleomagnetic measurements demonstrate that the Jijiagou section which is the stratotype one of Baode Stage of the Neogene in China records 12 normal and 11 reversed polarity zones.
Methods With alternative polarity stimulation of the peripheral segment of the facial nerve at stylomastoid foramen in cats, and recording of FNAEP by an electrode at the tympanic membrane.