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    • The X-Ray Microscope - Nature

      Nature· 11 hours ago

      As I pointed out some time ago1, a new kind of X-ray spectra can be obtained by focusing the characteristic X-radiation emerging from the surface layer ...

    • The Teleostean Swim-bladder - Nature

      Nature· 12 hours ago

      THE enigmatic secretion of gas into the teleostean swim-bladder has been attributed to the acidification of the blood bathing the gas gland epithelium1. The resultant local changes of pH, pCO2 ...

    • Excavations at Ur - Nature

      Nature· 12 hours ago

      The operations of the joint expedition this year are to be directed to the exploration of a cemetery of the Jemdet Nasr period of about 4,000 B.C., which lies at a depth of 54 ft. below < ...