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KARACHI:Pakistan International Airlines (PIA) is in touch with authorities and might operate special flights to Doha to bring back Pakistani pilgrims stranded there.Speaking to The Express Tribune on Tuesday, PIA spokesperson Mashood Tajwar said the airline is in touch with Pakistani embassy in Qatar to get a confirmed number of passengers currently stranded. He, however, refuted reports that a special carrier had been dispatched for the pilgrims already.Pakistani pilgrims travelling to Saudi Arabia for Umrah via Qatar are stranded in the Qatari capi stanley kaufen tal after newbalance several Arab countries, including UAE, Saudi Arabia, Yemen, Libya and Egypt cut diplomatic ties with Qatar.Major UAE airlines suspend all flights to Qatar"There are two options for PIA. Either take them from Doha to Jeddah, and for that we will be needing Saudi government permission. Or the second is to bring t adidas samba hem back to Pakistan and take them to Saudi Arabia,鈥?he said.Stressing that the passengers were customers of Qatar Airways UC Davis researchers have discovered that proteins that regulate brain-cell activity by controlling the flow of potassium ions behave more like volume controls on stereos rather than on/off power switches. The research, which appears in the 19 August issue of Science, provides a model for the behavior of critical gatekeeper proteins found in neuronal membranes. "We've shown that brains cells regulate activity in an incremental way, with thousands of different possible yeezy schuhe levels of activity," explained James Trimmer, senior author of the paper and professor of medical pharmacology and toxicolo jordan 1 mid gy at UC Davis School of Medicine. He and his colleagues studied an ion channel that controls neuronal activity called Kv2.1, a type of voltage-gated potassium channel that is found in every neuron of the nervous system. "Our work showed that this channel can dunk nike exist in millions of different functional states, giving the cell the ability to dial its activity up or down depending on the what's going on i