Kinematics of the Polar Area of Lomonosov Ridge Bottom in Arctic

1. The iodination of insulin was studied under various experimental conditions in aqueous media and in some organic solvents, by measuring separately the uptake of iodine by the four tyrosyl groups and the relative amounts of monoiodotyrosine and di-iodotyrosine that are formed. In aqueous media from pH1 to pH9 the iodination occurs predominantly on the tyrosyl groups of the A chain. Some organic solvents increase the iodine uptake of the B-chain tyrosyl groups. Their efficacy in promoting iodination of Tyr-B-16 and Tyr-B-26 is in the order: ethylene glycol and propylene glycol≃methanol and ethanol>dioxan>8m-urea. 2. It is suggested that each of the four tyrosyl groups in insulin has a different environment: Tyr-A-14 is fully exposed to the solvent; Tyr-A-19 is sterically influenced by the environmental structure, possibly by the vicinity of a disulphide interchain bond; Tyr-B-16 is embedded into a non-polar area whose stability is virtually independent of the molecular conformation; Tyr-B-26 is probably in a situation similar to Tyr-B-16 with the difference that its non-polar environment depends on the preservation of the native structure.

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4 The Law and Politics of the Lomonosov Ridge

Challenges of the Changing Arctic ◽

10.1163/9789004314252_006 ◽

2016 ◽

pp. 42-52

Keyword(s):

Lomonosov Ridge ◽

Law And Politics ◽

The Law

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Mass wasting at the Siberian termination of Lomonosov Ridge, Arctic Ocean

10.5194/egusphere-egu2020-7539 ◽

2020 ◽

Author(s):

Ursula Schlager ◽

Wilfried Jokat ◽

Estella Weigelt

Keyword(s):

Arctic Ocean ◽

Ice Sheets ◽

Seismic Stratigraphy ◽

The Arctic ◽

Lomonosov Ridge ◽

Mass Wasting ◽

Swath Bathymetry ◽

Seismic Amplitudes ◽

Drill Holes ◽

Mass Volume

The Lomonosov Ridge is an 1800 km long continental sliver in the center of the Arctic Ocean. Beside its tectonic relevance it hosts glaciogenic features caused either by deep reaching icebergs or grounded ice sheets as well as indications for mass wastings. Systematic swath bathymetry acquired in 2014 provided an almost complete image of these shallow disturbances from almost 84&#730; N to the foot of the Laptev margin.Several arcuate transverse features are present on both sides of the crest of the eastern part of Lomonosov Ridge between 81&#730; and 84&#730; N. Eight of them are 2.1-10.2 km wide, 1.7-8.2 km long, 125-851 m deep, with height of headwall between 58-207 m and a slid mass volume of 0.09-7.58 km3. Due to the absence of scientific drill holes only a tentative seismic stratigraphy can be used for a rough age estimate of the mass wasting. All but one show a glide plane on top of a pronounced stratigraphic seismic horizon with strong seismic amplitudes. We will introduce the different geometries and statistics of these mass wasting features.

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