Research led by Seng Chan You, MD, at the Yonsei University College of Medicine, Korea, has investigated the risk of cancer associated with use of the drug ranitidine compared to other histamine-2 receptor antagonists (H2RAs) ...
Plastics—in particular, microplastics—are among the most pervasive pollutants on the planet, finding their way into the air, water systems and food chains around the world. While the prevalence of microplastics in the ...
Aug 28, 2023
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A team of researchers at Korea Institute of Science and Technology, working with a colleague from Korea University, has found that etching grooves onto the surface of face masks makes them better at repelling water droplets ...
Researchers from the Institute of Glycomics have identified a novel bacterial sensor in Campylobacter species that enable the pathogenic cells to find suitable host cells. The findings have been published in Science Signalling.
Researchers at the University of Arizona are developing a COVID-19 testing method that uses a smartphone microscope to analyze saliva samples and deliver results in about 10 minutes.
Jan 29, 2021
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Water bottles are everywhere these days, along with all kinds of advice about exactly how much water you should be drinking. But how does your brain actually know when you've had enough and can stop feeling thirsty? A new ...
Mar 27, 2019
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Imagine a herd of deer grazing in the forest. Suddenly, a twig snaps nearby, and they look up from the grass. The thought of food is forgotten, and the animals are primed to respond to any threat that might appear.
Nov 8, 2018
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Memory T cells earn their name by embodying the memory of the immune system - they help the body remember what infections or vaccines someone has been exposed to. But to become memory T cells, the cells go backwards in time, ...
Dec 13, 2017
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Psychedelics are a hot topic in labs all over the world because they hold great potential for relieving the symptoms of depression, anxiety, PTSD and other mood-related conditions. Still, there is a major hurdle to developing ...
Apr 22, 2024
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When a mouthful of water goes down the wrong pipe—heading toward a healthy person's lungs instead of their gut—they start coughing uncontrollably. That's because their upper airway senses the water and quickly signals ...
Apr 18, 2024
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Water is a ubiquitous chemical substance, composed of hydrogen and oxygen, that is essential for the survival of many known forms of life. In typical usage, water refers only to its liquid form or state, but the substance also has a solid state, ice, and a gaseous state, water vapor or steam. Water covers 71% of the Earth's surface. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation. Saltwater oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%. A very small amount of the Earth's water is contained within biological bodies and manufactured products. Other water is trapped in ice caps, glaciers, aquifers, or in lakes, sometimes providing fresh water for life on land.
Water moves continually through a cycle of evaporation or transpiration (evapotranspiration), precipitation, and runoff, usually reaching the sea. Winds carry water vapor over land at the same rate as runoff into the sea. Over land, evaporation and transpiration contribute to the precipitation over land.
Clean, fresh drinking water is essential to human and other lifeforms. Access to safe drinking water has improved steadily and substantially over the last decades in almost every part of the world. There is a clear correlation between access to safe water and GDP per capita. However, some observers have estimated that by 2025 more than half of the world population will be facing water-based vulnerability. Water plays an important role in the world economy, as it functions as a solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation. Approximately 70 percent of freshwater is consumed by agriculture.
This text uses material from Wikipedia, licensed under CC BY-SA
