Teakwood rack (drawn approximately to scale)Test tubes of equal calibre. . i0^l Pipette for quinine test reagent. (Capacity 0 2|3 that of test tubes.) # rnlitb' Pipette for iodide test reagent. (Capacity slt'' less than J that of the test tubes.) _ u0nt Pipette for iodide mixtures. (Capacity * ?f C-) . gltO'l' Pipette for quinine mixtures. (Capacity 1110 that of B.) Lead plate for stability. Te...

UNLABELLED Repetitive pipetting is a task that is associated with work-related musculoskeletal disorders of the hand and arm. OBJECTIVE The purpose of this study was to evaluate the usability and ergonomic performance of commercially available pipettes as determined by user ratings and objective measurements. PARTICIPANTS Participants were laboratory technicians and scientists at the Lawren...

The development of anti-diphtheria serotherapy at the Institut Pasteur immediately follows the crisis known as the Pasteur-Koch debate. Research on diphtheria in Paris is indicative of the importance granted by Pasteurian scientists to Koch's school criticisms. After 1887, relations between French and German bacteriologists become more relaxed. A scientific and social network develops between t...

The present work is a continuation of the previously reported studies on the solubilities of various amino acids in water and their thermodynamic properties (1). No precise solubility determinations on l-proline and/-hydroxyproline appear to have been carried out previously. Due to the high solubility of l-proline and l-hydroxyproline, it was not feasible to carry out solubility determinations ...

The focal extracellular potential (FEP) described in this study is an electrophysiological signal related to the transmembrane potential (V(m)) of cardiac myocytes that avoids the mechanical fragility, interference with contraction, and intracellular contact associated with conventional whole cell recording. One end of a frog ventricular myocyte was secured into a glass holding pipette. The FEP...

Eggs of the sea urchin Arbacia punctulata were collected by the electroshock method (1), washed in artificial seawater, and sedimented by centrifugation at 500 g for 3 min . Embryos were obtained by fertilizing eggs in artificial seawater with a drop of fresh dilute sperm suspension . Only those cultures in which fertilization was 95-1007 effective were used for the isolation of nuclei. The sed...