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Angewandte Chemie International Edition

January 23, 2020

A novel drug, named “FerriIridium”, can simultaneously help diagnose and treat gastric cancer. The initially weakly active precursor (prodrug), based on an iridium-containing compound, is selectively activated only after reaching the interior of a tumor cell. This is possible because of the higher amount of iron present there, report scientists in the journal Angewandte Chemie. Selective activation reduces undesired side effects.

Taking Aim at Gastric Cancer: New approach to selective chemotherapy...

January 16, 2020

Infections are a dreaded threat that can have fatal consequences after an operation, in the treatment of wounds, and during tissue engineering. Biomimetic hydrogels with “built-in” antimicrobial properties can significantly decrease this danger. In the journal Angewandte Chemie山东快三走势图, scientists have now introduced a gel that is activated by red light to produce reactive oxygen compounds that effectively kill bacteria and fungi.

Lights on for Germ-Free Wound Dressings: Biomimetic hydrogel with photodynamic antimicrobial effect...

January 15, 2020

Structural colors appear because the imprinted pattern on a surface changes the wavelengths of light. Chinese scientists have introduced an azopolymer that allows the imprinting of nanopatterns in a novel room-temperature lithographic process. A key aspect of the technique is the light-induced phase change of a novel azopolymer, explains the study published in the journal Angewandte Chemie. The process relies solely on light regulation and allows nanoimprinting even on flexible substrates.

Imprinted Color Patterns: Azopolymer material allows light-assisted imprinting of nanostructures for structurally colored surfaces...

January 09, 2020

The folding state of the proteins in live cells often reflect the cell’s general health. Australian scientists have developed a molecular probe that senses the state of the proteome—the entire set of the proteins—by measuring the polarity of the protein environment. The fluorescence signal of the probe quantifies unfolding and its chameleon-like color shift maps the cellular regions of enhanced misfolding, says the study published in the journal Angewandte Chemie.

Sensing Protein Wellbeing: Molecular probe maps misfolded proteome state in live cells...

December 11, 2019

Ethylene, or ethene, is a primary feedstock for the chemical industry, including as a starting material for the production of a wide variety of plastics. In the journal Angewandte Chemie山东快三走势图, scientists have now introduced a new electrochemical technique for selective and energy-efficient production of ethylene from carbon monoxide, which can be obtained from renewable resources and waste.

Pathways toward Post-Petrochemistry: Electroreduction of carbon monoxide for the highly selective production of ethylene...

December 09, 2019

The composition of suspicious powders that may contain illicit drugs can be analyzed using a quick and simple method called magneto-Archimedes levitation (MagLev), according to a new study published in the journal Angewandte Chemie. A team of scientists at Harvard University, USA, has developed the MagLev method to differentiate common street drugs in dilute mixtures. The method could complement or even replace other portable drug identification techniques, the scientists suggest.

Separating Drugs with MagLev: Magneto-Archimedes levitation for identification of illicit drugs in powdered mixtures...

November 29, 2019

In many parts of the world, access to clean drinking water is far from certain. Filtration of large volumes of water, however, is slow and impractical. In the journal Angewandte Chemie, scientists have introduced a new water purification method based on magnetic nanoparticles coated with a so-called “ionic liquid” that simultaneously remove organic, inorganic, and microbial contaminants, as well as microplastics. The nanoparticles are then easily removed with magnets.

Providing Safe, Clean Water: Magnetic nanoparticles with ionic liquids for water purification...

November 04, 2019

Next-generation batteries will probably see the replacement of lithium ions by more abundant and environmentally benign alkali metal or multivalent ions. A major challenge, however, is the development of stable electrodes that combine high energy densities with fast charge and discharge rates. In the journal Angewandte Chemie山东快三走势图, US and Chinese scientists report a high-performance cathode made of an organic polymer to be used in low-cost, environmentally benign, and durable sodium-ion batteries.

Post-Lithium Technology: High-energy-density polymeric cathode for fast-charge sodium- and multivalent-ion batteries...

October 25, 2019

Theoretically, our immune system could detect and kill cancer cells. Unfortunately, tumors are well armed to fight these attacks. Despite modern cancer treatments, metastases and relapses remain a major problem. Increasing anti-tumor immunity might now be made possible, thanks to copper telluride nanoparticles that mimic enzymes, especially under NIR-II light irradiation. This induces oxidative stress in tumor cells, quashing their immunosuppressive status and triggering inflammatory processes...

October 18, 2019

Evening gowns with interwoven LEDs may look extravagant, but the light sources need a constant power supply from devices that are as well wearable, durable, and lightweight. Chinese scientists have manufactured fibrous electrodes for wearable devices that are flexible and excel by their high energy density. A microfluidic technology was key for the preparation of the electrode material was a microfluidic technology, as shown in the journal Angewandte Chemie.

Electric Cloth: Flexible, wearable supercapacitors based on porous nanocarbon nanocomposites...

September 30, 2019

Many natural compounds used in medicine have complex molecular architectures that are difficult to recreate in the lab. Help could come from a small hydrocarbon molecule, called tetravinylallene, which has been synthesized for the first time by Australian scientists. As detailed in the journal Angewandte Chemie山东快三走势图, tetravinylallene can be used to construct complex molecular frameworks more quickly and with less environmental impact than by using established methods.

Strained, Symmetric, and New: Tetravinylallene, a small but powerful molecule, has been synthesized for the first time...

September 11, 2019

Nanoclusters are little “heaps” of a few atoms that often have interesting optical properties and could become useful probes for imaging processes in areas such as biomedicine and diagnostics. In the journal Angewandte Chemie, researchers have introduced a nanocluster of 16 silver atoms stabilized by a wrapping of DNA strands. Using X-ray analysis, they were able to determine the crystal structure and identify important interactions within it.

Little Heaps of Silver, All Wrapped Up: Determination of the crystal structure of a DNA-stabilized silver nanocluster...

September 04, 2019

The sun is the most sustainable energy source available on our planet and could be used to power photochemical reactions. In the journal Angewandte Chemie, scientists present a widely applicable, cost-effective photomicroreactor. It is based on “Luminescent Solar Concentrators“, which harvest, convert, and make photons available for chemical reactions. Thus, the researchers were able to synthesize various substances, including two pharmaceuticals.

Colorful Microreactors Utilize Sunlight: Energy-Efficient Solar Photochemistry with Luminescent Solar Concentrators...

August 16, 2019

Organic solar cells are made of cheap and abundant materials, but their efficiency and stability still lag behind those of silicon-based solar cells. A Chinese-German team of scientists has found a way to enhance the electric conductivity of organic solar cells, which increases their performances. Doping the metal oxide interlayer, which connected the electrode and active layer, with a modified organic dye boosted both the efficiency and stability, the study published in the journal Angewandte...

August 09, 2019

Many industrial and agriculture processes use chemicals that can be harmful for workers and the ecosystems where they accumulate. Researchers from Thailand have now developed a bioinspired method to detect and detoxify these chemicals in only one step. As they report in the journal Angewandte Chemie山东快三走势图, a combination of two natural enzymatic reactions convert harmful chloro- and nitrophenols into the substance that causes the characteristic glowing of fireflies: luciferin.

Analysis and Detoxification in One Step: A smart chemoenzymatic method detects and removes hazardous phenols...

August 07, 2019

Tumor cells circulating in blood are markers for the early detection and prognosis of cancer. However, detection of these cells is challenging because of their scarcity. In the journal Angewandte Chemie, scientists have now introduced an ultrasensitive method for the direct detection of circulating tumor cells in blood samples. It is based on the amplified, time-resolved fluorescence measurement of luminescent lanthanide ions released from nanoparticles that bind specifically to tumor cells.

Enhanced Glow: Direct detection of circulating tumor cells in blood samples...

August 06, 2019

It may be possible to reach new levels of miniaturization, speed, and data processing with optical quantum computers, which use light to carry information. For this, we need materials that can absorb and transmit photons. In the journal Angewandte Chemie, Chinese scientists have introduced a new strategy for constructing photonic heterostructure crystals with tunable properties. Using a crystalline rod with stripes that fluoresce in different colors, they have developed a prototype of a logic...

July 31, 2019

Bacteria can actively move towards a nutrient source—a phenomenon known as chemotaxis—and they can move collectively in a process known as swarming. Chinese scientists have redesigned collective chemotaxis by creating artificial model nanoswimmers from chemically and biochemically modified gold nanoparticles. The model could help understand the dynamics of chemotactic motility in a bacterial swarm, concludes the study published in the journal Angewandte Chemie.

Actively Swimming Gold Nanoparticles: Chemotactic movement on the macroscale by a swarm of bacteria-mimicking nanoswimmers...

July 18, 2019

The art of tattooing may have found a diagnostic twist. A team of scientists in Germany have developed permanent dermal sensors that can be applied as artistic tattoos. As detailed in the journal Angewandte Chemie山东快三走势图, a colorimetric analytic formulation was injected into the skin instead of tattoo ink. The pigmented skin areas varied their color when blood pH or other health indicators changed.

The Art of Sensing within the Skin: Dermal tattoo sensors for the detection of blood pH change and metabolite levels...

July 03, 2019

A particularly aggressive, metastasizing form of cancer, HER2-positive breast cancer, may be treated with nanoscopic particles “imprinted” with specific binding sites for the receptor molecule HER2. As reported by Chinese researchers in the journal Angewandte Chemie, the selective binding of the nanoparticles to HER2 significantly inhibits multiplication of the tumor cells.

Imprinted Spheres Fight Breast Cancer: Inhibition of HER2 on tumor cells by molecularly imprinted nanoparticles...

July 02, 2019

Salmonella and listeria are among the most widely distributed and deadliest causes of foodborne infections. Their rapid and reliable detection on food and industrial food processing equipment is very important. In the journal Angewandte Chemie, scientists have introduced a new, ultrasensitive, chemiluminescence-based method for the direct detection of Salmonella and Listeria monocytogenes. Because of the simplicity and sensitivity, this test is significantly faster than conventional methods...

May 27, 2019

Antibiotic-resistant bacteria are an increasing health threat, making new antibiotics essential. German researchers have recently had a breakthrough: they discovered lugdunin in the human nose—a new kind of cyclic peptide that comes from the bacterium Staphylococcus lugdunensis and has strong antimicrobial properties against Stahphylococcus aureus, among others. The researchers have been able to clarify the mode of action by synthesizing variants. As they explain in the journal ...

May 16, 2019

Part of the immune system in the brain is made up of so-called microglia cells. Korean and Singaporean researchers have now developed a fluorescent probe that specifically labels this type of macrophage. The cells were visualized in cell culture and in the live brains of rodents. As detailed in the journal Angewandte Chemie, a gene product expressed in microglia triggers the probe into a fluorescing state, which is detected through live-cell fluorescence imaging.

Microglia Turned On: Visualizing microglia in brain tissue with a fluorescence turn-on substrate...

May 13, 2019

Underwater vehicles, diving robots, and detectors require their own energy supply to operate for long periods independent of ships. A new, inexpensive system for the direct electrochemical extraction of energy from seawater offers the advantage of also being able to handle short spikes in power demand, while maintaining longer term steady power. To do so, the system can autonomously switch between two modes of operation, as researchers report in the journal Angewandte Chemie.

Underwater Power Generation: Energy from seawater: power generator autonomously switches between two functional modes...

April 30, 2019

Living cells can react to disturbances with a changed metabolism, but direct observation of trafficking metabolites in live cells is difficult. An international team of scientists has now developed a class of remarkably small fluorophores called SCOTfluors. The dyes emit light in the visible to near-infrared range and can be attached to common metabolites. The study was published in the journal Angewandte Chemie.

Tracking Small Things in Cells : Small and tunable fluorophores for the imaging of metabolites in living cells...

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