Room Temperature
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Author(s):  
Polyssena Renzi ◽  
Emanuele Azzi ◽  
Enrico Bessone ◽  
Giovanni Ghigo ◽  
Stefano Parisotto ◽  
...  

An unprecedented visible light enhanced room temperature Heck reaction between aryl halides and allenyl tosyl amines is here reported. The simple catalytic system (Pd(OAc)2/PPh3) is exploited to afford arylated vinyl...


Science ◽  
2021 ◽  
Vol 374 (6572) ◽  
pp. 1201-1202
Author(s):  
Reuven Gordon

2021 ◽  
Author(s):  
Michela Notarangelo ◽  
Alessandro Quattrone ◽  
Massimo Pizzato ◽  
Sheref S. Mansy ◽  
O. Duhan Toparlak

We report colorimetric detection of SARS-CoV-2 viral RNA by an in vitro transcription/translation assay with crude E. coli extracts at room temperature, with the aid of body heat. Clinically-relevant concentrations of viral RNA (ca. 600 copies/test) were detected from synthetic RNA samples. The activation of cell-free gene expression was achieved by toehold-switch-mediated riboregulatory elements that are specific to viral RNA sequences. The colorimetric output was generated by the α-complementation of β-galactosidase ω-fragment (LacZ-ω) with cell-free expressed LacZ-α, using an X-gal analogue as a substrate. The estimated cost of single reaction is less than 1 euro/test, which may facilitate diagnostic kit accessibility in developing countries.


Nature ◽  
2021 ◽  
Author(s):  
Anton V. Zasedatelev ◽  
Anton V. Baranikov ◽  
Denis Sannikov ◽  
Darius Urbonas ◽  
Fabio Scafirimuto ◽  
...  

2021 ◽  
Author(s):  
Mai He ◽  
Cuihuan Ge ◽  
Kai Braun ◽  
Lanyu Huang ◽  
Xin Yang ◽  
...  

Abstract The quantum optical phenomena, such as single photon emission, in two-dimensional (2D) transition metal dichalcogenides (TMDCs) have triggered extensive researches on 2D material-based quantum optics and devices. By far, most reported quantum optical emissions in TMDCs are based on atomic defects in the material or the local confinement of excitons by introducing local stain or potential. In contrast, energy transfer between two materials could also manipulate the photon emission behaviors in materials, even at the single photon level. Along with the single-photon emission nature of zero-dimensional (0D) quantum dots (QDs) at room temperature, constructing a 0D-2D hybrid heterostructure may provide an effective way to regulate the quantum states related optical emissions of TMDCs. Here, we report on fluorescence blinking, a quantum phenomenon, from MoS2 atomic layers in QD/ MoS2 heterostructure at room temperature. We demonstrate the single-photon nature of the QDs in heterostructures by second-order photon correlation measurements. Based on the transient PL spectroscopy and PL time trajectories, we attribute the fluorescence blinking behavior in MoS2 to the single photon energy transfer from QD to MoS2. Our work opens the possibility to achieve correlated quantum emitters in TMDCs at room temperature by controlling the energy transfer between QD and TMDCs.


2021 ◽  
Author(s):  
Christian De Vita ◽  
Marco Asa ◽  
Claudio Somaschini ◽  
Mikel Urquia ◽  
Maria Eloisa Castagna ◽  
...  

2021 ◽  
Vol 118 (49) ◽  
pp. e2116184118
Author(s):  
Chuanlong Wang ◽  
Yue Zhang ◽  
Yiwen Zhang ◽  
Jianmin Luo ◽  
Xiaofei Hu ◽  
...  

A series of sodium phosphorothioate complexes are shown to have electrochemical properties attractive for sodium-sulfur battery applications across a wide operating temperature range. As cathode materials, they resolve a long-standing issue of cyclic liquid–solid phase transition that causes sluggish reaction kinetics and poor cycling stability in conventional, room-temperature sodium-sulfur batteries. The cathode chemistry yields 80% cyclic retention after 400 cycles at room temperature and a superior low-temperature performance down to −60 °C. Coupled experimental characterization and density functional theory calculations revealed the complex structures and electrochemical reaction mechanisms. The desirable electrochemical properties are attributed to the ability of the complexes to prevent the formation of solid precipitates over a fairly wide range of voltage.


2021 ◽  
pp. 2110251
Author(s):  
Abrar Alhazmi ◽  
Olaiyan Alolaiyan ◽  
Majed Alharbi ◽  
Saeed Alghamdi ◽  
Awsaf Alsulami ◽  
...  

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