Determine disinfectant and antiseptic effectiveness using zone inhibition method

This allows students to focus on the process and techniques of investigation and the subsequent reporting. However, in Year 12 students are often given freedom to choose a topic or research question from the work covered over the whole of the course. These "Open Inquiry" EEIs may provide more ownership, engagement and deeper understanding for the students but do place a bigger demand on resources and laboratory management. However, many teachers have found strategies to manage this should they choose to opt for a Open EEIs.

Determine disinfectant and antiseptic effectiveness using zone inhibition method

This allows students to focus on the process and techniques of investigation and the subsequent reporting. However, in Year 12 students are often given freedom to choose a topic or research question from the work covered over the whole of the course.

These "Open Inquiry" EEIs may provide more ownership, engagement and deeper understanding for the students but do place a bigger demand on resources and laboratory management.

However, many teachers have found strategies to manage this should they choose to opt for a Open EEIs.

Senior Biology - 'Deadly' Extended Experimental Investigations

A Materials Requisition Form accompanies this document. My thanks to Biology teachers from Nanango for sharing this. Examples of Risk Assessment forms can be found in the tasks available on this page.

A comprehensive form developed over several years by Urangan SHS can be found here: It is only an example and should not be assumed to necessarily meet the legal and safety obligations of any particular school or situation. The method of artificial variation: The method of concomitant variation: This is also called a "correlation method".

You can think that nature has manipulated the variables but it is still appropriate to class one as dependent and one as independent. For example, do young leaves have the same density and distribution of stomata as older leaves; or how does temperature IV in a natural environment affect stoma opening DV?

In this second case you do not need you to control the environmental temperature, but you do need to measure the DV at different temperatures. The difficulty with the second approach is the control of other potentially influential variables such as humidity - as you have to take what you get.

Determine disinfectant and antiseptic effectiveness using zone inhibition method

However, that does not preclude the variables in relationship being considered the IV and DV or being graphed as such. One way to address the confounding variables eg humidity is to collect data on the other variable as well.

You can run the statistics on each pair separately, but, for students who are not that "stats-savvy" then they could look for interactions between them at a visual level.

Food, as well as meeting the nutritional requirements of humans, will also meet the nutritional needs of a vast range of micro-organisms. These microbes will multiply rapidly in food, given the appropriate conditions such as temperature, pH and moisture. The flavour, aroma and texture will ultimately be affected.

Those most affected by food poisoning are the elderly, the young and immune suppressed individuals. A petri dish culture of the yeastlike organism fungus Candida krusei, after 10 days growth on dextrose agar. This species is known to be a food spoilage organism. Dichloran Rose Bengal Chloramphenicol Agar is a commercially specialist culture medium for viable yeasts and moulds in food products.

It incorporates Rose Bengal, which both helps limit colony size and is selective against bacteria. Effects of different anti microbials on bacterial growth Joseph Lister first introduced aseptic surgery in when he used a spray of carbolic acid phenol C6H5OH as a germicide.

Since then the control of growth by antimicrobial compounds has grown into a multi-billion dollar industry. A good EEI is to assess the effect of a variety of antimicrobial disinfectants on bacterial growth.

Our labbies prepare the plates and order in E. Small paper discs like out of a hole punch are sterilised and then soaked into different anti-microbials. The discs are placed onto the agar plates and then into the incubator for a couple of days. If the anti bacterial is effective there is a clear ring around the disc where the E.

Students have used the width of this ring to indicate effectiveness and to collect quantitative data. The experiment can work quite well; keen students have then researched the active compounds within the antibiotic, how they act upon the bacteria and link to the results observed".Determine Disinfectant and Antiseptic Effectiveness Using Zone Inhibition Method Prepared for: By: Date: Introduction Page: Abstract This study is to examine the effects of different types of disinfectants by disk diffusion method using common agents such as Betadine, Clorox, Crest, Kiss My Face, Listerine, and Lysol.

Wound care and general. In Part 1 of this series, I talked about why the basic premise of the acid-alkaline theory is flawed, and I showed that the evidence doesn’t support the idea that a net acid-forming diet is harmful to bone health. Now I want to look at the effect of dietary acid load on other health conditions.

Can the acidity or alkalinity of your diet affect your risk for muscle loss, cancer, and more? Jun 17,  · The Public Inspection page on metin2sell.com offers a preview of documents scheduled to appear in the next day's Federal Register issue. The Public Inspection page may also include documents scheduled for later issues, at the request of the issuing agency.

Hydrochloric acid is a strong corrosive acid that is commonly used as a laboratory reagent. It is formed by dissolving hydrogen chloride in water. Determine Disinfectant and Antiseptic Effectiveness Using Zone Inhibition Method Words | 6 Pages Using P-Element Induced Male Recombination to Generate a Deletion in the Dmap1 Gene on Chromosome Two in Drosophila Melanogaster.

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Senior Biology - 'Deadly' Extended Experimental Investigations