Results 31 to 40 of about 76,802 (312)
Pyridine C─N Transposition via Cycloaddition–Cycloreversion
Angewandte Chemie, EarlyView.Transposition of pyridine nitrogen from the 4‐ to the 3‐position is described using two open and shut sequences: a nucleophile addition ring‐open ring‐closure, followed by a nitrile Diels–Alder cycloaddition cycloreversion. The nitrogen swap is particularly effective for tertiary alkyl substituents, transforming easily accessible para‐alkylated ...
Aífe Conboy, Michael F. Greaney
wiley +2 more sources
Patterned-ground facilitates shrub expansion in Low Arctic tundra
Environmental Research Letters, 2013 Recent expansion of tall shrubs in Low Arctic tundra is widely seen as a response to climate warming, but shrubification is not occurring as a simple function of regional climate trends.
Gerald V Frost +4 more
doaj +1 more source
Acta Agrobotanica, 2015 The aim of the study was to investigate the concentration of Alnus L., Corylus L. and Betula L. pollen in the village of Gudowo (Western Pomerania, Poland) in the years 2012–2014 in order to estimate the threat of allergenic tree pollen in this rural ...
Aleksandra Kruczek +3 more
doaj +1 more source
Norsk Antropologisk Tidsskrift, 2020 Sammendrag Seks forskjellige sjarker, innsiden og utsiden, skipperne og kontekstuell atferd er i fokus. Det argumenteres for at sjarken kan forstås som et hjem.
Harald Beyer Broch
doaj +1 more source
Advanced Science, EarlyView.ABSTRACT The human body functions as a natural reactor for a vast network of chemical and biological reactions and physical interactions among small molecules, proteins, cells, and numerous other components. These reactions/interactions are essential for maintaining normal physiological functions.
Yuhao Cai, Chao Zhao
wiley +1 more source
Angewandte Chemie, EarlyView.Cyclopentadienes (CpHs) are fundamental building blocks with widespread applications in chemistry. However, their inherent acidity and isomeric instability have long limited access to chiral variants in an asymmetric fashion. Here, we introduce a CuH‐catalyzed asymmetric transformation that provides an unprecedented entry into a new class of ...
Piero Soppelsa +4 more
wiley +2 more sources
Acta Agrobotanica, 2012 The aim of the study was to determine seasonal variations in concentrations of hazel and alder pollen count due to meteorological parameters. Measurements were performed using the volumetric method. The analysed meteorological parameters were the maximum
Małgorzata Puc
doaj +1 more source
Advanced Science, EarlyView.ABSTRACT Large‐ion (K, Na) battery systems mitigate uneven global lithium distribution, while their ability to attain recharge time shorter than refueling would remove the final barrier for secondary batteries to replace petroleum vehicles. However, their large‐ion chemistry makes ultra‐fast charging an even significant challenge.
Shukai Ding +12 more
wiley +1 more source
Kaposiform haemangioendothelioma (KHE): Not just a bruise
JPRAS Open, 2014 Kaposiform haemangioendothelioma is a rare, but potentially fatal vascular tumour of childhood. We present a case that highlights the diagnostic and management challenges of this condition, particularly when associated with Kasabach–Merritt phenomenon ...
J. May +4 more
doaj +1 more source
Ultrastable Self‐Cross‐linkable Electro‐Optic Materials Based on a Bisanthracene Scaffold
Advanced Electronic Materials, EarlyView.A novel bisanthracene‐based self‐cross‐linkable electro‐optic chromophore (TD2) is developed. TD2 exhibits a high r33 of 141 pm/V and a cross‐linked Tg up to 195 °C, retaining 99.75% of its initial EO response after 500 h at 85 °C, showing record‐high thermal stability for single‐molecule self‐cross‐linking EO materials.
Xingtao Wang +6 more
wiley +1 more source