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Cretaceous climatic oscillations in the Bering area (Alaska and Koryak Upland): Isotopic and palaeontological evidence
Abstract New isotopic palaeotemperatures, estimated from δ 18 O values of Early Albian, latest Campanian and Early Maastrichtian ammonoid shells of Southern Alaska, as well as our previously…
Palaeotemperature curve for the Late Cretaceous of the northwestern circum-Pacific
Abstract In the northwestern circum-Pacific, two main trends in Late Cretaceous temperatures can be recognized. (1) In general, a recurrent warming trend is thought to have begun in the…
Spongiadioxins A and B, two new polybrominated dibenzo-p-dioxins from an Australian marine sponge Dysidea dendyi.
- N. Utkina, V. Denisenko, +5 authors A. Popov
- Chemistry, MedicineJournal of natural products
- 3 January 2001
Two new cytotoxic tetrabromodibenzo-p-dioxins were isolated from an Australian marine sponge Dysidea dendyi and established by 1D and 2D NMR spectroscopy, X-ray analysis, and synthesis of the methyl ether of spongiadioxin B from diphenyl ether isolated from dysidea herbacea.
Recovery of brachiopod and ammonoid faunas following the End-Permian crisis: Additional evidence from the lower Triassic of the Russian Far East and Kazakhstan
After the End-Permian mass extinction, ammonoids reached levels of taxonomic diversity higher than in the Changhsingian by the Dienerian Substage of the Induan. However, brachiopods exhibit a…
Late Permian to Middle Triassic palaeogeographic differentiation of key ammonoid groups: evidence from the former USSR
Palaeontological characteristics of the Upper Permian and upper Olenekian to lowermost Anisian sequences in the Tethys and the Boreal realm are reviewed in the context of global correlation. Data…
New maastrichtian oxygen and carbon isotope record: Additional evidence for warm low latitudes
The Cretaceous period was generally characterized by greenhouse conditions. Nevertheless, our data on isotopic composition of biogenic carbonates from the Koryak Upland and Sakhalin (Russian Far…
Fossil wood of Keteleerioxylon kamtschatkiense sp. nov. (Pinaceae) from the Cretaceous of the northwestern Kamchatka Peninsula
A new species, Keteleerioxylon kamtschatkiense, is described from the Cretaceous of the northwestern Kamchatka Peninsula on the basis of wood anatomy. Fossil wood showing anatomical characters of the…
Protective effects of polar lipids and redox-active compounds from marine organisms at modeling of hyperlipidemia and diabetes
Polar lipids containing various polyunsaturated fatty acids and the investigated redox-active compounds (echinochrome A, rosmarinic acid, luteolin and its sulphate conjugates) have been proposed and developed compositions may be used for creation of new biologically active additives and remedies.
Greater South China extended to the Khanka block: Detrital zircon geochronology of middle-upper Paleozoic sandstones in Primorye, Far East Russia
Abstract In order to examine paleogeographic link between Primorye and Japan with respect to other continental blocks in East Asia, middle-upper Paleozoic shallow marine sandstones of the Khanka…
Study of antioxidant and membrane activity of rosmarinic acid using different model systems
- A. Popov, A. Osipov, E. A. Korepanova, O. N. Krivoshapko, A. A. Artyukov
- Chemistry, MedicineBiofizika
- 1 September 2013
Rosmarinic acid is significantly superior to trolox, ascorbic acid and dihydroquercetin in the tests for antioxidant activity in the systems studied, as well as in inhibition of linoleic acid peroxidation.