Results 31 to 40 of about 206,414 (303)
Total Synthesis of the Spirocyclic Bis‐Indole Alkaloid (−)‐Owerreine via a [4+2] Annulation
Angewandte Chemie, EarlyView.The total synthesis of the bis‐indole alkaloid (−)‐owerreine has been accomplished by a diastereoselective [4+2] annulation between an enamine and an α,β−unsaturated indolenine precursor to form the 3‐spirocyclic tetrahydropyridine linkage of the natural product. DFT calculations allow an understanding of the mechanism of the key annulation.
Elisa Coll +4 more
wiley +2 more sources
A Pyralid Moth (Lepidoptera) as Pollinator of Blunt-Leaf Orchid [PDF]
, 2017 (excerpt) As early as 1912, mosquitoes were observed bearing the pollen masses (pollinia) of the blunt-leaf orchid, Habenaria obtusata (Pursh) Richardson, in Reese\u27s Bog, a cedar swamp at the north end of Burt Lake, Cheboygan County, Michigan, near ...
Riefner, Richard E, Jr., Voss, Edward G
core +2 more sources
Evasion Differential Games in the Space of Square Summable Sequences
GamesIn this article, we consider simple-motion pursuit–evasion differential games in the Hilbert space of square summable sequences. We show that when the players have the same dynamic capabilities, evasion is possible under some assumptions about the ...
Bekhzod Aminov, Marks Ruziboev
doaj +1 more source
Hydrological self-regulation of domed peatlands in south-east Asia and consequences for conservation and restoration [PDF]
Mires and Peat, 2010 This article explores the hydrological constraints on the existence of forested peat domes (peat swamp forests) in the humid tropics, the self-regulation mechanisms that enable them to persist and the implications for restoration of damaged domes.
R. Dommain, J. Couwenberg, H. Joosten
doaj
Land, 2021 Peatlands are the “kidneys” of river basins. However, intensification of agriculture and forestry in Europe has resulted in the degradation of peatlands and their biodiversity (i.e., species, habitats and processes in ecosystems), thus impairing water ...
Michael Manton +13 more
doaj +1 more source
Field Simulation of Global Change: Transplanting Northern Bog Mesocosms Southward [PDF]
, 2010 A large proportion of northern peatlands consists of Sphagnum-dominated ombrotrophic bogs. In these bogs, peat mosses (Sphagnum) and vascular plants occur in an apparent stable equilibrium, thereby sustaining the carbon sink function of the bog ecosystem.
Berendse, F. +3 more
core +2 more sources
Vascular plant species response to warming and elevated carbon dioxide in a boreal peatland
Environmental Research Letters, 2020 Peatlands store a significant amount of terrestrial organic carbon in plant biomass and soils. The Spruce and Peatland Responses Under Changing Environments (SPRUCE) project is a warming and elevated carbon dioxide (eCO _2 ) experiment designed to test ...
Mara Y McPartland +5 more
doaj +1 more source
Land, 2021 The peatlands of the West Siberian Lowlands, comprising the largest pristine peatland area of the world, have not previously been covered by continuous measurement and monitoring programs.
Egor Dyukarev +12 more
doaj +1 more source
Smart Agricultural TechnologyAgricultural crops are frequently exposed to severe frost events in the spring, which can greatly impact yield quantity and quality. To manage frost effectively, early warning systems are often used to forecast potential spring frost in advance of an ...
Sandeep Bhatti +6 more
doaj +1 more source
Reproductive isolation and genetic differentiation of dry land and bog populations of Pinus sylvestris L. in Western Siberia and Russian Plain [PDF]
Сибирский лесной журнал, 2017 The results of large-scale interdisciplinary ecological and geographical researches (1973–2015 years), environmental gradients, reproductive isolation, genetic and phenotypic differentiation of Scots pine (Pinus sylvestris L.) populations of the dry ...
I. V. Petrova +2 more
doaj +1 more source