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Thread: Food poisoning bacteria

  1. #1 Food poisoning bacteria 
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    Hi all,

    I have a question relating to food poisoning which im hoping someone can help me with.

    Im trying to answer the following question:

    Describe, with reference to journal literature, how food poisoning bacteria are able to survive and/or proliferate in foods.

    The answer must convey a recognition and understanding of:
    * the influential factors within foods which influence the growth and survival of microorganisms
    * relate these factors to the growth of specific food borne bacterial pathogens
    * use information from journals (at least five references published within four years) to effectively explain the relationship of environmental factors and the growth of specific food borne bacterial pathogens

    Now i have been able to identify the environmental factors which are oxygen, water, temperature, PH and time, but im confused what the influential factors are and how i am supposed to relate these factors to the growth of specific food borne pathogens. So if anyone can explain this to me or point me in the right direction i will be gratefull for any help i receive.

    I have been researching on the internet but cant seem to find any information, i am going wrong somewhere but any one with knowledge of this area please help me out.


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  3. #2 Re: Food poisoning bacteria 
    Moderator Moderator TheBiologista's Avatar
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    Quote Originally Posted by junior25
    Hi all,

    I have a question relating to food poisoning which im hoping someone can help me with.

    Im trying to answer the following question:

    Describe, with reference to journal literature, how food poisoning bacteria are able to survive and/or proliferate in foods.

    The answer must convey a recognition and understanding of:
    * the influential factors within foods which influence the growth and survival of microorganisms
    * relate these factors to the growth of specific food borne bacterial pathogens
    * use information from journals (at least five references published within four years) to effectively explain the relationship of environmental factors and the growth of specific food borne bacterial pathogens

    Now i have been able to identify the environmental factors which are oxygen, water, temperature, PH and time, but im confused what the influential factors are and how i am supposed to relate these factors to the growth of specific food borne pathogens. So if anyone can explain this to me or point me in the right direction i will be gratefull for any help i receive.

    I have been researching on the internet but cant seem to find any information, i am going wrong somewhere but any one with knowledge of this area please help me out.
    The environmental factors you list are pretty much what you're interested in the case of food and blood as well. O2 concentration, H2O presence, temp, pH, carbon (or general food) availability; these are all factors that we still consider with reference to both "environments". They have significant impact on how we go about preserving food from spoilage too.

    In terms of your references, you want to start out with your searches on Google Scholar or Pubmed. Google Scholar is easier to search but Pubmed is particularly good for the kind of literature research you're doing as it gives you a tab with your search results that says "review". The results in there will be reviews that summarise the current (at time of publication) overall topic.

    Give it a shot and if you're still struggling, come back to us.


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  4. #3 Food poisoning bacteria 
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    Hi,

    I understand the environmental factors, but what does it mean by the influential factors within foods? thats where my problem lies. If you have tried to explain it in your post im sorry but like i said im confused i cant seem to understand it. Does it mean how the environmental factors are influenced by certain pathogens to survive and proliferate in foods?

    Im ok with the references iv got about 10 so far to relate to my answer.
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  5. #4  
    Forum Cosmic Wizard i_feel_tiredsleepy's Avatar
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    Maybe they are referring to stuff like scomboid food poisoning where the histidine carboxylase of Morganella morganii converts the histadine naturally present in the decaying fish to toxic levels of histamine.
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  6. #5  
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    My thoughts like more along the lines of certain food creating certain conditions.

    Osmolarity will be higher on fruits than on vegetables for example. I don't know that this is what the question is getting at, since environmental seems to be pulled out as a separate topic, but perhaps the notion of food properties overlapping environmental conditions is suggested.
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  7. #6  
    Forum Cosmic Wizard i_feel_tiredsleepy's Avatar
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    It's best to ask the course TA or prof about the assignment I think.
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  8. #7 Re: Food poisoning bacteria 
    Administrator KALSTER's Avatar
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    I don't quite understand what the problem is. Perhaps I misunderstand a few things being a high school graduate only. :?

    The answer must convey a recognition and understanding of:
    * the influential factors within foods which influence the growth and survival of microorganisms
    Packaging, preservatives, storing environment, specifics of food product, etc.
    * relate these factors to the growth of specific food borne bacterial pathogens
    List of known food contaminating microbes. The attributes of each microbe, i.e. metabolism, aerobic/anaerobic, production of toxins, infection in the body, etc. and how the storing particulars of different food products provide viable environment for growth.
    * use information from journals (at least five references published within four years) to effectively explain the relationship of environmental factors and the growth of specific food borne bacterial pathogens
    The design of packaging, estimated shelf life, Pre-preparation (Pasteurisation, etc), just general plugging of the holes left for pathogens to proliferate.
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
    "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle
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  9. #8 Advanced Food Microbiology 
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    Hi,

    Ok thanks everyone for replying.

    Ok i kind of have an idea now of what i need to do, but im still confused on the influential factors. Iv been told the the influential factors within foods which influence the growth and survival of microorganisms include nutrion.....so would protein and carbohydrates be included??? if anyone can comment on this and give me a few more influential factors i should be looking at the would be great.

    Ok once i have the influential factors how can i relate these to the environmental factors which include ph and temperature etc....? im still pretty confused on how to do this so can someone help me out. I took into account what prea said and i did produce an answer but i was told by my lecturer that it was too basic and i was not addressing the influential factors. My assignment was more focused on the environmental factors such as ph and temp, oxygen etc so i need to focus more on the influential factors.
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  10. #9  
    Administrator KALSTER's Avatar
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    Influential factors pertaining to a viable environment for the growth of the particular microbe you mean?
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
    "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle
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  11. #10 Re: Advanced Food Microbiology 
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    Quote Originally Posted by junior25
    Hi,

    Ok thanks everyone for replying.

    Ok i kind of have an idea now of what i need to do, but im still confused on the influential factors. Iv been told the the influential factors within foods which influence the growth and survival of microorganisms include nutrion.....so would protein and carbohydrates be included??? if anyone can comment on this and give me a few more influential factors i should be looking at the would be great.
    Pathogens, including the food-borne variety, are chemoheterotrophs, does this help?

    Ok once i have the influential factors how can i relate these to the environmental factors which include ph and temperature etc....?.
    Have you studied how cellular macromolecules respond to heat, pressure, and pH? Typically the effect of heat and pH on proteins is a basic objective in microbiology, has your course included this.
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