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The positive control group displayed widespread root resorption lacunae.
METHODS: Seventy-five Balb/c mice were randomly divided into negative control group (n = 15), positive control group (n = 15), low MCP concentration group (n = 15), middle MCP concentration group (n = 15) and high MCP concentration group (n = 15).
The birds of group 1 as positive control did not receive any medicines or vaccines.
Conclusions In this study, contamination of the ancient specimens is unlikely because of the extensive precautions we took, including use of the suicide PCR protocol excluding positive controls (4).
The rats were split into four treatment groups: a negative control implanted with 10 pellets of tantalum (an inert metal), a positive control implanted with 10 pellets of nickel (a known carcinogen), a high-dose group implanted with 10 pellets of tungsten alloy, and a low-dose group implanted with 4 pellets of tungsten alloy and 16 pellets of tantalum.
First, we attempted to verify the reliability of using the history, the clinical examination, and the skin-prick allergen test as a definitive method of diagnosing allergic rhinitis; two groups of subjects were recruited for this purpose (the positive control group and the negative control group).
We have devised an alternative strategy for creating a renewable resource of positive control samples of known [alpha]-thalassemia genotype, derived from existing patient DNA samples.
This experiment consists of creating a positive control spot for the MRSA detection assay, this is to make sure that when testing for this particular strain of bacteria, the test is performed accurately.