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KOH String Test is a rapid bedside/lab test used to differentiate Gram-negative from Gram-positive bacteria without performing Gram stain. 🧪 How it works: Mix a colony with 3% KOH on a slide Gently lift with a loop or stick 🧬 Result interpretation: 🧵 String formation (viscous, sticky thread) → Gram-negative ✅ 👉 Cell wall breaks → DNA released ❌ No string → Gram-positive ⚡ Why it’s useful: Faster than Gram stain Helpful when Gram stain is unclear Great for teaching & quick screening 📌 Rememb
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KOH String Test is a rapid bedside/lab test used to differentiate Gram-negative from Gram-positive bacteria without performing Gram stain. 🧪 How it works: Mix a colony with 3% KOH on a slide Gently lift with a loop or stick 🧬 Result interpretation: 🧵 String formation (viscous, sticky thread) → Gram-negative ✅ 👉 Cell wall breaks → DNA released ❌ No string → Gram-positive ⚡ Why it’s useful: Faster than Gram stain Helpful when Gram stain is unclear Great for teaching & quick screening 📌 Rememb
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Ryma Cherchour on Instagram: "This is a string test used to differentiate Gram-negative from Gram-positive bacteria. A colony is mixed with 3% KOH on a slide. If the bacterium is Gram-negative, its cell wall is lysed, releasing DNA that makes the mixture viscous, forming a string when lifted. If it's Gram-positive, no string forms due to the stronger cell wall. #microbiology #biology #laboratoiredz #laboratory #dzlab #microbiologie #microbiologist #microbiologie #lab #laboratoire #virology #LabL
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Jack Mosley on Instagram: "The string test is a quick and easy way to give a rough idea of your metabolic health. The core principle is that your waist should be less than half your height, otherwise you may be at an increased risk of cardio metabolic diseases from heart disease to diabetes to high blood pressure In some ways it is a more practical screening tool than BMI which doesn’t account for distribution of fat or muscle mass"
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