00334nam a2200157Ia 4500008004100000020000900041035001000050082001300060100002100073245002600094250000600120260002700126300000800153500000900161650000600170210723s9999||||xx |||||||||||||| ||und||  aNULL  a23841  a579BKNU  aKnudsen, Jens W. 0aBiological Techniques  a-  aNew YorkbHarper & Row  a525  a1147  a-