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Reged: 07/14/16 Posts: 7948 Loc: Here |
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This experiment will demonstrate that bacteria will cause turbidity in a LC and that turbidity is easily recognized. 5 nutrient rich liquid mediums were used for this test. The nutrient density is purposefully kept to a minimum so that the liquid medium will be crystal clear and able to effectively contrast turbidity. Three of these broths contain 0.05% malt extract by weight and the other two were made from diluted rye grain water which was then further diluted by mixing with 19 parts water. Bacteria and mold colonies used for this test were gathered from these plates 1 ME broth was inoculated with a grey/opaque bacterial colony, 1 ME broth was inoculated with a yellow bacterial colony and 1 ME broth was inoculated with a mold colony. 1 GW broth was inoculated with a wedge containing both cube myc and the grey/opaque bacteria and the other GW broth was inoculated with a wedge containing both mold and cube myc. These broths were incubated at 25C (77F) and swirled once a day. The 5 broths shortly after inoculation: To inspect for turbidity an object should be placed right behind the LC jar along with a back light that will illuminate both broth and the object. I chose to use a small spore solution vial but any kind of object can be used as long as it has distinct patterns/lines that can be easily observed through the crystal clear LC jar. Example: After only 8h of incubation we can already observe noticeable turbidity in LC's that were inoculated with bacteria and the spore vial can not be seen through all the light diffusion inside the liquid media. The light scatters in all directions as it reflects off of countless bacterial cells. LC's containing only mold and/or cube myc are still transparent and the spore vial can be observed through the broth. Results: The LC's in those pics above were inoculated with bacterial agar wedges and regardless how tiny the bacterial colonies were they still contained a huge number of cells which contributed to a very fast colonization of the broth. For the next test I will use just a fraction of that and let's see what will happen. These next jars were both first inoculated with 10ml of mold liquid culture each using a syringe and needle. One of these mold LC's was then inoculated with one drop of bacterial solution and the other mold LC was inoculated by gently touching the broth surface with the needle tip of that same needle. The broth that was inoculated with 1 drop of bacterial solution went turbid within a few hours and the mold colony appeared to stop growing right away. The other (needle tip) broth offered the mold colony a chance to recover briefly but within 24h it also went turbid and no more growth could be observed in the mold colony. Results: In the pics below I didn't even use a background object, only light, and the bacterial LC can easily be differentiated from the clean LC and from the control jar which hadn't been inoculated. Results: -------------------- Cakes inside Water Tub Edited by Mateja (03/10/22 01:00 AM)
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