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Morphometric and geological conditions for sediment accumulation in the Udava River, Outer Carpathians, Slovakia

Journal of Geographical Sciences 2017年第8期27卷 981-998页

作者： BARABAS Dusan bona jan KLEIN Daniel BALAZOVICOVA Lenka Pavol Jozef Safarik University Institute of Geography Faculty of Science Jesenna 5 040 01 Kosice Slovakia Kpt. Jarosa 13 040 22 Kosice Slovakia Pavol Jozef Safarik University Institute of Mathematics Faculty of Science Jesenna 5 040 01 Kosice Slovakie Matej Bel University Institute of Geography and Geology Faculty of Natural Sciences Tajovskeho 40 97401 Banska Bystrica Slovakia

The accumulation of sediment in river channels is a phenomenon that is not only influenced by the channel morphology, but also by the physical and geographical character- istics and the endogenous and exogenous processes taking place in the catchment. This paper presents an analysis of the impact the changes in lithological conditions have on the morphological and morphometric parameters of the Udava River channel and their relation to the channel accumulation forms representative of the river＇s longitudinal profile as well as of its planform. Results document when accumulation forms occur and what is their spatial dis- tribution within the longitudinal and cross-sectional river profiles. More resistant structures created sections with a lower degree of sedimentation, while in depression segments the degree of sedimentation was higher. With the increase in longitudinal slope, the impact of channel width on the average channel bar size increased. Also a difference in the accumula- tion was observed between the left and right bank which could be possibly explained by the impact of Coriolis force.

关键词： Flysch Carpathians Udava River river channel channel bar accumulation longitudinal profile

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Drosophila Nomp C is a mechano-transduction channel subunit for gentle touch sensation

Drosophila Nomp C is a mechano-transduction channel subunit ...

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中国生理学会第24届全国会员代表大会暨生理学学术大会

作者： Yuh Nung jan 闫致强 Wei Zhang 复旦大学生命科学学院

Touch sensation is essential for behaviors ranging from environmental exploration to social interaction,but the underlying mechanisms are largely *** Drosophila larvae,two types of sensory neurons,class ⅡI and class IV dendritic arborization（da）neurons,tile the body *** mechanotransduction channel Piezo in class IV da neurons is essential for sensing noxious mechanical stimulus but is not involved in gentle *** we report that class ⅡI da neurons are touch sensitive and contribute to gentle touch sensation,based on electrophysiological recording,calcium imaging and behavioral *** further identify Nomp C（no mechanoreceptor potential C）,a member of the transient receptor potential（TRP）family of ion channels,as a mechanotransduction channel for gentle *** C is highly expressed in class ⅡI da neurons and required for their ***,ectopic Nomp C expression confers touch sensitivity to the normally touch insensitive class IV da *** only is Nomp C critical for gentle touch to elicit behavioral responses,Nomp C expression in Drosophila S2cells gives rise to mechanosensitive channels whose ion selectivity can be altered by Nomp C mutation,indicating Nomp C is a pore-forming subunit of a mechanotransduction *** study establishes Nomp C as a bona fide mechanotransduction channel that satisfies all four criteria and mediates gentle touch sensation,and suggests that different mechanosensitive channels might be utilized to sense gentle touch versus noxious mechanical stimulus.

关键词： touch Drosophila ion channel mechanosensation

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