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The group is tasked with quickly detecting variants. Assessing their possible impact. Delta is the fourth global variant of concern WHO has identified since the pandemic began. The three others - alpha, beta and gamma - were first identified in the United Kingdom, South Africa and Brazil, respectively. Scientifically, the delta variant is known as B.1.617.2. The delta variant has become a VOC due to some mutations in the spike protein, says Mehul Suthar, assistant professor of pediatrics at Emory Vaccine Center and Yerkes National Primate Research Center. At least four mutations in the delta variant have been associated with faster spread and/or higher infectivity based on previous variants with similar mutations. The spike proteins are those red protrusions rising up from the main "ball," or lipid bilayer membrane, of the virus. Spike proteins are responsible for penetrating host cells and causing infection. With the wild coronavirus, you can expect to have symptoms including fever or chills, cough, shortness of breath or difficulty breathing, fatigue, muscle or body aches, loss of taste or smell, nausea or vomiting, or diarrhea. Off-peak cooling systems don't only shift the demand for power to a different time of day, they create a more stable cooling environment that can deliver the same cooling capacity with less energy consumption. They bring less efficient, dirtier plants on line if they need them and buy energy from other power plants on the grid at premium prices, passing those charges along to their customers. They also expand their facilities when they can't meet current or projected demand. Making the energy grid more efficient by distributing the demand for electricity and reducing energy consumption by running air conditioning at optimal performance reduces greenhouse gas emissions and forestalls the need for more energy plants to handle the load. On the next page, we'll take a look at how off-peak cooling systems can work at night and still cool the air during the hottest part of the day. These coils circulate ethylene or propylene glycol. bbc one minute world news

















































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