Über die Existenz maximaler algebraischer Körpererweiterungen

Ohne Zusammenfassung     

Multi-parameter determination of TNFα, PCT and CRP for point-of-care testing

A proof of concept for the simultaneous multi-parameter determination of three inflammation and sepsis parameters-TNFα, PCT and CRP-using a compact optical immunosensor is demonstrated. Harmonized assay conditions revealed standard curves with test midpoints (IC(50)) of 380 μg L(-1) for TNFα, 2300 μg L(-1) for PCT, and 2645 μg L(-1) for CRP.     

A facile synthesis of large extraannular-functionalized phenyl-ethynyl macrocycles containing m-terphenyl units

[reaction: see text] Two large extraannular-functionalized phenyl-ethynyl macrocycles containing m-terphenyl units are described. The synthesis of the m-terphenyl building blocks is based on the transformation of pyrylium salts to arenes.     

Facile synthesis and X-ray structure of alkoxy-functionalized dibenzo[fg,op]naphthacenes

[structure: see text] 1,3-Bis(2-bromophenyl)-2,5-diphenylbenzenes are readily available by the condensation of phenylacetates with the corresponding pyrylium salts and undergo a palladium-catalyzed dehydrohalogenation to give functionalized dibenzo[fg,op]naphthacenes.     

Capacitive sensing of droplets for microfluidic devices based on thermocapillary actuation

The design and performance of a miniaturized coplanar capacitive sensor is presented whose electrode arrays can also function as resistive microheaters for thermocapillary actuation of liquid films and droplets. Optimal compromise between large capacitive signal and high spatial resolution is obtained for electrode widths comparable to the liquid film thickness measured, in agreement with supporting numerical simulations which include mutual capacitance effects. An interdigitated, variable width design, allowing for wider central electrodes, increases the capacitive signal for liquid structures with non-uniform height profiles. The capacitive resolution and time response of the current design is approximately 0.03 pF and 10 ms, respectively, which makes possible a number of sensing functions for nanoliter droplets. These include detection of droplet position, size, composition or percentage water uptake for hygroscopic liquids. Its rapid response time allows measurements of the rate of mass loss in evaporating droplets.     

A Non‐Exploding Alkali Metal Drop on Water: From Blue Solvated Electrons to Bursting Molten Hydroxide

Alkali metals in water are always at the brink of explosion. Herein, we show that this vigorous reaction can be kept in a non‐exploding regime, revealing a fascinating richness of hitherto unexplored chemical processes. A combination of high‐speed camera imaging and visible/near‐infrared/infrared spectroscopy allowed us to catch and characterize the system at each stage of the reaction. After gently placing a drop of a sodium/potassium alloy on water under an inert atmosphere, the production of solvated electrons became so strong that their characteristic blue color could be observed with the naked eye. The exoergic reaction leading to the formation of hydrogen and hydroxide eventually heated the alkali metal drop such that it became glowing red, and part of the metal evaporated. As a result of the reaction, a perfectly transparent drop consisting of molten hydroxide was temporarily stabilized on water through the Leidenfrost effect, bursting spectacularly after it had cooled sufficiently.