科学与环境
Water-stable catalyst could bring carbon-bond chemistry closer to use in living cells
来源: Phys.org - latest science and technology news stories · 发布于
Olefin metathesis is one of the most important reactions in organic chemistry for forming carbon–carbon bonds—for example, in the production of pharmaceuticals, plastics and complex natural products. However, previous ruthenium catalysts that enable this reaction have faced a maj
Olefin metathesis is one of the most important reactions in organic chemistry for forming carbon–carbon bonds—for example, in the production of pharmaceuticals, plastics and complex natural products. However, previous ruthenium catalysts that enable this reaction have faced a major challenge: They rapidly degrade in aqueous or biological environments, making their use in natural systems such as cells or blood extremely difficult.
相关报道
Uncovering species–specific chemical sensitivity by focusing on mammalian hormone receptor evolution
Chemicals affect biological species in different ways, posing a major challenge for assessing environmental chemical risks. However, the mechanisms behind these differences have remained largely unknown.
Phys.org - latest science and technology news stories ·
Without water, forests lose their ability to absorb CO₂
To survive periods of drought, trees halt photosynthesis, a highly water-intensive process. For every molecule of CO₂ absorbed by a tree leaf, an average of around 400 water molecules are released. Entire forests may then end up emitting more CO₂ than they capture.
Phys.org - latest science and technology news stories ·
Scientists discover an “impossible” cellular survival pathway that could help fight cancer
Scientists discovered a surprising backup system that lets mammalian cells make the essential amino acid cysteine even when the pathways once considered indispensable are disabled. The same survival mechanism may help cancer cells resist treatment, raising the possibility that sh
All Top News -- ScienceDaily ·
New device captures carbon dioxide by pumping it across a battery
Equipment to capture carbon dioxide from ambient air or smokestacks generally works through a sort of reversible filter. Air is passed through granules or a liquid that absorbs the CO 2 , then that CO 2 -loaded substance undergoes a process (usually heating) that causes it to let
Ars Technica - All content ·
Corporations claim their fossil fuel emissions are a drop in the ocean. But what if we could count the real cost?
A new tool called Carbon Impacts Tracer can be used to estimate climate impact from emissions across eight metrics, including lost food production The biggest coal project before authorities in New South Wales, the HVO mine , will emit the equivalent of about 809m tonnes of clima
World news | The Guardian ·