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Sampling device for growing biofilms on glass plates in a river (biofilm collector). (A) Cross-sectional view (line II—II in panel B). (B) Top view (line I—I in panel A). 1 and 2, top and bottom plates with eight grooves for exposed glass plates (380 by 240 by 15 mm); 3, side plate (200 by 400 by 10 mm); 4, threaded metal rod (length, 750 mm); 5, exposed glass plate (200 by 400 by 4 mm); 6, groove for exposed glass plate (4.5 by 5 by 220 mm); 7, stabilizing bar (5 by 10 by 270 mm).
