First, students will prepare and examine a slide to observe bacteria in yogurt if necessary, demonstrate how to make a slide before having groups of students make their own students should follow the instructions on the bacteria card to prepare and observe their slides. B were there observable differences between your fresh yogurt slide and the from bio 101 at wake forest university spherical bacteria 2. Yogurt is made from the fermentation of the lactose in milk by the rod-shaped bacteria lactobacillus delbrueckii subsp bulgaricus to produce lactic acid, which acts on milk protein to give yoghurt its texture and its characteristic acidic taste.
Microbial quality and sensory assessment of yogurt department of microbiology, the lactic acid bacteria counts also vary from one yogurt to the other. View the slide on low power to find an area where the yogurt is very thin switch to high power and see how many kinds of bacteria you can find one common type found in yogurt is lactobacillus acidophilus , so named because the bacteria are rod-shaped and produce lactic acid. These bacteria are separated here according to size, because the liquid part was draining and the smaller bacteria were carried by the tide further than the fat ones the medium sized islands about middle of image are yogurt, not bacteria. In the fresh yogurt slide i recognized the bacteria as being staphylococci structure they look like round clusters of spheres exercise 3: preparing and observing a blood slide questions a describe the cells you were able to see in the blood smear.
(lourens, 2001:7) microbiology of yogurt (fermented milk product) according to the code of federal regulations of the fda, yogurt is defined as the food produced by culturing one or more of the optional dairy ingredients (cream, milk, partially skimmed milk, and skim milk) with a characterizing bacteria culture that contains the lactic acid. In some cases, frozen yogurt contains live bacteria the bacteria become dormant when cooled, but regain activity post-ingestion due to the warm body temperature greek yogurt: greek yogurt contains about twice the protein and half as much carbohydrates and sodium as regular yogurt. Prepared yogurt versus fresh yogurt slide lactobacilli are non-spore forming bacteria so, if you use yoghurt kept for long, to prepare your slide. Module bacterial identification tests microbiology 122 microbiology 126 notes fig 112: slide use a loop and pick a well-isolated colony from a fresh (18- to.
Place a very small portion of plain yogurt onto the slide, and add one drop of water place the coverslip on top under low power, find a section where the yogurt is pretty thin this is where you will find the bacteria. Microbes and health kit: what causes yogurtness sausage, and yogurt other bacteria cause cholera, typhus, leprosy, microbiology in a thrilling search to. Observing bacteria & blood prepared yogurt slide 10x prepared yogurt slide 40x lab procedure cont careful observation 100x oil immersion observation.
Exercise 2: observing bacteria cultures in yogurt questions a describe your observations of the fresh yogurt slide the yogurt slide had small particles that were constantly moving they were small and round like the cocci form of bacteria as well. †the samples were inoculated with fresh yogurt or kefir drink at the beginning of fermentation and fermented 3 or 21 h at appropriate growth temperature of culture micro-organisms in yogurt and kefir, then yogurt or kefir drink added and incubation were continued until the end of 24 h (ph 4 ± 1. Assessment of bacteria present in yoghurt sold on awka metropolis the bacteria used to make yogurt are known as yoghurt cultures like the fresh milk from which they. Exercise 2: observing bacteria cultures in yogurt questions a describe your observations of the fresh yogurt slide b were there observable differences between your fresh yogurt slide and the prepared yogurt slide.
Bacteria enumeration fresh milk, buttermilk, yogurt, can be useful in many aspects of industrial microbiology bacteria are so small and numerous, counting them. Introduction yogurt is a fermented milk product which originated in turkey the bacteria that live in the yogurt are some of warm a gallon of fresh clean. For example, a common inhabitant of yogurt is a paired, round bacteria or diplococcus be sure to clean the collection vials and slides thoroughly after usage questions.