Investigating organelles

Descripción

A-Levels (Cells & movement in/out of them) Biology Mapa Mental sobre Investigating organelles, creado por hannah.lindridge el 14/05/2013.
hannah.lindridge
Mapa Mental por hannah.lindridge, actualizado hace más de 1 año
hannah.lindridge
Creado por hannah.lindridge hace alrededor de 11 años
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Resumen del Recurso

Investigating organelles
  1. Cell fractionation
    1. Cold
      1. To reduce enzyme activity which might break down organelles
      2. Isotonic
        1. Prevent bursting/shooting by osmostic loss/gain
        2. Buffered
          1. To maintain constand pH
        3. Homogenation
          1. Cells broken up by homogeniser (blender)
            1. Resultant fluid (homogenate) filtered to remove complete cells and large debris
          2. Ultracentrifugation
            1. Tubes of homogenate spun at high speed
              1. Tube of filtrate placed in ultracentrifuge and spun at low speed
                1. Heaviest organelle forced to bottom (sediment)
                  1. Fluid at top (supernatant) removed leaving only sediment
                    1. Supernatant transferred to another tube and spun again at higher speed
                      1. Next heaviest organelles forved to bottom- process continued with increase in speed each time
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