Results 101 - 120 of 2764.

Chemistry - Physics - 30.03.2021
Researchers first to link silicon atoms on surfaces
Researchers first to link silicon atoms on surfaces
Materials such as gallium arsenide are extremely important for the production of electronic devices. As supplies of it are limited, or they can present health and environmental hazards, specialists are looking for alternative materials. So-called conjugated polymers are candidates. These organic macromolecules have semi-conductor properties, i.e. they can conduct electricity under certain conditions.

Chemistry - Environment - 30.03.2021
Researchers aim to reduce emissions of process which feeds 40% of the world
A new research project is setting out to investigate how to make an industrial process which helps feed nearly half the world's population more sustainable. The Haber-Bosch process, developed in the early 20th Century, was the first economically-viable large-scale ammonia production process. It works by combining nitrogen and hydrogen under high pressures, with the addition of an iron-based catalyst which helps the process work at a moderate temperature.

Chemistry - Pharmacology - 25.03.2021
Chemists achieve breakthrough in the production of three-dimensional molecular structures
Chemists achieve breakthrough in the production of three-dimensional molecular structures
A major goal of organic and medicinal chemistry in recent decades has been the rapid synthesis of three-dimensional molecules for the development of new drugs. These drug candidates exhibit a variety of improved properties compared to predominantly flat molecular structures, which are reflected in clinical trials by higher efficacy and success rates.

Chemistry - Materials Science - 25.03.2021
First closeups of how a lithium-metal electrode ages
Scientists have documented a process that makes these next-gen batteries lose charge - and eventually some of their capacity for storing energy - even when a device is turned off. The same process that drains the battery of your cell phone even when it's turned off is even more of a problem for lithium-metal batteries, which are being developed for the next generation of smaller, lighter electronic devices, far-ranging electric vehicles and other uses.

Physics - Chemistry - 24.03.2021
Do You Know the Way to Berkelium, Californium?
Do You Know the Way to Berkelium, Californium?
Heavy elements and a really powerful microscope help scientists map uncharted paths toward new materials and cancer therapies H eavy elements known as the actinides are important materials for medicine, energy, and national defense. But even though the first actinides were discovered by scientists at Berkeley Lab more than 50 years ago, we still don't know much about their chemical properties because only small amounts of these highly radioactive elements (or isotopes) are produced every year; they're expensive; and their radioactivity makes them challenging to handle and store safely.

Environment - Chemistry - 24.03.2021
Aerosol formation in clouds
Aerosol formation in clouds
Researchers at the Paul Scherrer Institute PSI have studied for the first time how chemical reactions in clouds can influence the global climate. They found that isoprene, the dominant non-methane organic compound emitted into the atmosphere, can strongly contribute to the formation of organic aerosols in clouds.

Life Sciences - Chemistry - 23.03.2021
Where and how plants detect the nutrient potassium
Where and how plants detect the nutrient potassium
Newly discovered group of cells in the root tip reacts to potassium deficiency and directs signalling pathways mediating plant adaptation Potassium is an essential nutrient for all living things. Plants need it in large quantities, especially for growth and in order to withstand stress better. For this reason, they absorb large quantities of potassium from the soil.

Environment - Chemistry - 23.03.2021
In LA, aerosols from vegetation overtaking aerosol pollutants from cars
Mexican fan palms, native to the deserts of northwestern Mexico, are a widely-planted ornamental throughout the Los Angeles basin and are contributing substantially to the organic aerosol pollution in the area, according to a UC Berkeley study. (Photo courtesy of Wikimedia Commons) California's restrictions on vehicle emissions have been so effective that in at least one urban area, Los Angeles, the most concerning source of dangerous aerosol pollution may well be trees and other green plants, according to a new study by University of California, Berkeley, chemists.

Materials Science - Chemistry - 22.03.2021
Recyclable ’veggie’ battery could power future devices
A new type of 3D-printed battery which uses electrodes made from vegetable starch and carbon nanotubes could provide mobile devices with a more environmentally-friendly, higher-capacity source of power. A team of engineers led from the University of Glasgow have developed the battery in a bid to make more sustainable lithium-ion batteries capable of storing and delivering power more efficiently.

Life Sciences - Chemistry - 22.03.2021
Cells On the Rack
Device the size of a few micrometres provides insight into how cells respond to mechanical stress Cell behaviour - for instance during wound healing - is controlled by biological factors and chemical substances, with physical forces such as pressure or tension also playing a role.

Health - Chemistry - 19.03.2021
Particulates are more dangerous than previously thought
Particulates are more dangerous than previously thought
Researchers at the Paul Scherrer Institute PSI have for the first time observed photochemical processes inside the smallest particles in the air. In doing so, they discovered that additional oxygen radicals that can be harmful to human health are formed in these aerosols under everyday conditions. They report on their results today .

Life Sciences - Chemistry - 19.03.2021
Revealing the way a critical enzyme works in the cell
Revealing the way a critical enzyme works in the cell
Combining structural biology, molecular simulations, mutagenesis, and in vivo assays, EPFL scientists have made the first extensive study of the mode of action of the enzyme acyl thioesterase, which regulates deacylation, one of the most critical functions of the cell. S'acylation is the process of chemically linking a lipid to protein via a thioester bond.

Chemistry - 19.03.2021
Scientists invent material inspired by bone that can strengthen from vibration
Gel created by Pritzker School of Molecular Engineering team could lead to new adhesives, implants Bone is not just a fixed material-it's a dynamic set of structures that can adapt their mass and strength based on the loads they must support. Developing that sort of adaptive material has long been the dream of scientists.

Materials Science - Chemistry - 18.03.2021
The invisible keyhole
The invisible keyhole
Hard times for burglars and safecrackers: Empa researchers have developed an invisible "keyhole" made of printed, transparent electronics. Only authorized persons know where to enter the access code. At first glance, Empa researcher Evgeniia Gilshtein's idea seems inconspicuous - or more precisely, invisible.

Astronomy / Space Science - Chemistry - 18.03.2021
Scientists Uncover Warehouse-Full of Complex Molecules Never before Seen in Space
Scientists have discovered a vast, previously unknown reservoir of new aromatic material in a cold, dark molecular cloud by detecting individual polycyclic aromatic hydrocarbon molecules in the interstellar medium for the first time, and in doing so are beginning to answer a three-decades-old scientific mystery: how and where are these molecules formed in space?

Materials Science - Chemistry - 15.03.2021
Voltage from wood
Voltage from wood
Researchers at ETH Zurich and Empa have chemically modified wood and made it more compressible, turning it into a mini-generator. When compressed, it generates an electrical voltage. Such wood could serve as a biosensor or as a building material that harvests energy. As Ingo Burgert and his team at ETH Zurich and Empa have proven time and again: wood is so much more than just a building material.

Health - Chemistry - 15.03.2021
Many Sunscreens Contain a Carcinogenic Compound
An organic sunscreen filter frequently used in sunscreens and anti-aging creams, octocrylene degrades within the bottles themselves into a known carcinogenic and endocrine disrupting compound: benzophenone.

Earth Sciences - Chemistry - 12.03.2021
Traces of Earth's early magma ocean identified in Greenland rocks
Traces of Earth’s early magma ocean identified in Greenland rocks
New research led by the University of Cambridge has found rare evidence - preserved in the chemistry of ancient rocks from Greenland - which tells of a time when Earth was almost entirely molten. It's astonishing that we can even hold these rocks in our hands - let alone get so much detail about the early history of our planet Helen Williams The study, published in the journal Science Advances , yields information on an important period in our planet's formation, when a deep sea of incandescent magma stretched across Earth's surface and extended hundreds of kilometres into its interior.

Chemistry - Physics - 12.03.2021
Role of solvent molecules in light-driven electron transfer revealed
Role of solvent molecules in light-driven electron transfer revealed
Light-absorbing molecules can transform photons into electricity or fuels by shuttling electrons from one atom to another. In many cases the molecules are surrounded by a solvent - such as water, in the case of the electron shuttling that underlies photosynthesis - and studies have shown that the solvent plays an important role in these electron transfers.

Chemistry - Life Sciences - 05.03.2021
Tracking proteins in the heart of cells
Tracking proteins in the heart of cells
For the first time, a team from the University of Geneva has been able to follow precisely the path taken by a protein within the cell, paving the way for the study of the transport and distribution network of vital elements necessary for its survival. In order to stay alive, the cell must provide its various organelles with all the energy elements they need, which are formed in the Golgi apparatus, its centre of maturation and redistribution of lipids and proteins.