Flexible tactile sensors are garnering substantial interest for various promising applications, including artificial intelligence, prosthetics, healthcare monitoring, and human–machine interactions (HMI). However, it still remains a critical challenge in developing high‐resolution tactile sensors without involving high‐cost and complicated manufacturing processes. Herein, a flexible high‐resolution triboelectric sensing array (TSA) for self‐powered real‐time tactile sensing is developed through a facile, mask‐free, high‐efficient, and environmentally friendly laser direct writing technique. A 16 × 16 pixelated TSA with a resolution of 8 dpi based on patterned laser‐induced graphene (LIG) electrodes (7 Ω sq−1) is fabricated by the complementary intersection overlapping between upper and lower aligned semicircular electrode arrays. With the especially patterning design, the complexity of TSA and the number of data channels is reduced. Meanwhile, the TSA platform exhibits excellent durability and synchronicity and enables the achievement of real‐time visualization of multipoint touch, sliding, and tracking motion trajectory without power consumption. Furthermore, a smart wireless controlled HMI system, composed of a 9‐digital arrayed touch panel based on a LIG‐patterned triboelectric nanogenerator, is constructed to control personal electronics wirelessly. Consequently, the self‐powered TSA as a promising platform demonstrates great potential for an active real‐time tactile sensing system, wireless controlled HMI, security identification and, many others.

No abstract

Whooping cough (pertussis) is a highly contagious acute respiratory illness of humans caused by the Gram-negative bacterial pathogen Bordetella pertussis. The AT (autotransporter) BrkA (Bordetella serum-resistance killing protein A) is an important B. pertussis virulence factor that confers serum resistance and mediates adherence. In the present study, we have solved the crystal structure of the BrkA β-domain at 3 Å (1 Å=0.1 nm) resolution. Special features are a hairpin-like structure formed by the external loop L4, which is observed fortuitously sitting inside the pore of the crystallographic adjacent β-domain, and a previously undiscovered hydrophobic cavity formed by patches on loop L4 and β-strands S5 and S6. This adopts a ubiquitous structure characteristic of all AT β-domains. Mutagenesis studies have demonstrated that the hairpin-like structure and hydrophobic cavity are crucial for BrkA passenger domain (virulence effector) translocation. This structure helps in understanding the molecular mechanism of AT assembly and secretion and provides a potential target for anti-pertussis drug design.

With perceiving and converting mechanical stimuli into electrical and visual readouts simultaneously, electronic skin endows a safe and effective interaction between human and environment. However, both weak optical signals and low spatial resolution are still challenging the potential application of electronic skin in human–machine information interaction (HMI). Herein, a novel high‐brightness, high‐resolution, and flexible triboelectrification‐induced electroluminescence (TIEL) skin is developed for real‐time imaging and HMI. The TIEL skin composed of ZnS:Cu‐embedded polyvinylidene‐fluoride‐co‐hexafluoropropylene (ZEPH) film can convert gentle touch stimuli into real‐time light emission at trigger pressure threshold as low as 1.25 kPa. Moreover, collected by fiber optic spectrometer, the brightness of TIEL is 2.5 times as strong as an LED lighted up by 2 V power supply. Meanwhile, the bright TIEL emission can also be observed by the naked eyes in the daytime. Furthermore, a spatial resolution of less than 220 µm can be achieved in real‐time TIEL imaging. Additionally, by integrating the ZEPH films with the microcontroller, a wearable optical–electrical dual‐output‐based wireless communication system is constructed to control the trajectory of a miniature car. The unique operation of the desired TIEL with simple fabrication demonstrates a great potential in trajectory tracking, skin prosthesis, robotics, and advanced HMI.

Aryl cyanides have been prepared from the corresponding aryl bromides with potassium hexacyanoferrate(II) usingPd/C as a catalyst. It is shown that the addition of Bu3N is the key factor in obtaining the corresponding aryl cyanides. Furthermore, the catalyst can be recycled by filtration and washing sequences, making the method also attractive for industrial applications.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

Organic persistent luminescent materials have attracted special attention due to their significant applications in optoelectronics, sensors, and security technology areas. In this work, a series of organic compounds (1−4) with twisted electron donor−acceptor structures are successfully designed and synthesized, and then the resultant compounds are dissolved in methyl methacrylate (MMA), and afterward, in situ polymerization realizes single-molecular organic room-temperature phosphorescent (RTP) materials (P1−P4). All RTP materials show long lifetime, especially P2 exhibits ultralong lifetime of 1.51 s. When the compounds are grown into single crystals, multicolor-tunable afterglow is obtained at different delay times due to the dual emission of phosphorescence and delayed fluorescence, which is promising to be applied in high-level anticounterfeiting.

Integral membrane proteins are involved in a wide range of essential biological functions and the determination of their three-dimensional structures plays a central role in understanding their function. This review focuses on the structures of one class of integral membrane proteins: the functionally diverse all-alpha type membrane proteins. It gives an overview of all the structures determined by X-ray crystallography, describing each system and structure in turn. It shows that the structures of all-alpha type membrane proteins have made valuable contributions to understanding structure-function relationships in membrane proteins. These range from the first insights into the function of exciting individual proteins to an in-depth knowledge of protein function from entire biological systems.

Polymeric room temperature phosphorescence (RTP) materials have attracted tremendous attentions owing to their excellent flexibility, easy processing, low cost, and good thermal stability. In this work, an improved strategy is proposed for ultralong RTP polymeric materials through copolymerizing the phosphor monomer with D (donor)−A (acceptor) structure and another monomer with ultrastrong multiple hydrogen bonds. A series of copolymers (P1–P4) containing different ratios of carbazole‐dibenzofuran (CDF) and ureidopyrimidinone (UPy) segments are successfully prepared. The obtained copolymers show ultralong phosphorescence lifetimes between 1.70 and 2.16 s with afterglow duration time between 15 and 17 s. The multiple hydrogen bonds of UPy groups can promote extremely intermolecular and intramolecular interactions, which immobilize the phosphors to prevent nonradiative transitions. Especially, these interactions lead to the copolymers can be robustly resistant to high temperature and humidity. Flexible and foldable anti‐counterfeiting with high temperature and humidity resistant features are achieved, which would be applied in practical special environments.