What preservative concentration is used for preserving fleas during shipping?

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Multiple Choice

What preservative concentration is used for preserving fleas during shipping?

When shipping fleas, you want a preservative that stops decay but also keeps fine structures intact for later examination. A moderate ethanol solution around 75–80% in water provides that balance: the water helps ethanol penetrate the small body and denature proteins gradually, preserving morphology and color without excessive dehydration. Using fully concentrated solvents, like 100% ethanol, can dry and shrink delicate tissues, making features harder to study. Other options such as a saltwater solution don’t fix tissues effectively and can encourage microbial growth, while glycerin can keep specimens too soft for detailed morphology. Methanol at high concentration is more toxic and can introduce artifacts, so it’s not the preferred choice for shipping fleas.

When shipping fleas, you want a preservative that stops decay but also keeps fine structures intact for later examination. A moderate ethanol solution around 75–80% in water provides that balance: the water helps ethanol penetrate the small body and denature proteins gradually, preserving morphology and color without excessive dehydration. Using fully concentrated solvents, like 100% ethanol, can dry and shrink delicate tissues, making features harder to study. Other options such as a saltwater solution don’t fix tissues effectively and can encourage microbial growth, while glycerin can keep specimens too soft for detailed morphology. Methanol at high concentration is more toxic and can introduce artifacts, so it’s not the preferred choice for shipping fleas.

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