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Because Na has MW of ~23 and Cl has MW of ~35...both of which are small enough to pass through a molecular weight cut off (MWCO) of 50 (don't add there molecular weights together). urea has ~ MW of 60 so it's too big to cross membrane.
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What is the process called to form urea?
Diazolidinyl urea is produced by the chemical reaction of allantoin and formaldehyde in the presence of sodium hydroxide solution and heat. The reaction mixture is then neutralized with hydrochloric acid and evaporated. Note: Diazolidinyl urea is an antimicronbial preservative used in cosmetics. It is chemically related to imidazolidnyl urea which is used in the same way. Diazolidinyl urea acts as a formaldehyde releaser. Commercial diazolidinyl urea is a mixture of different formaldehyde addition products including polymers. source: http://en.wikipedia.org/wiki/Diazolidinyl_urea
Is urea crystals element?
No, urea is a nitrogen compound.
What is nh2conh2?
CO(NH2)2 is the chemical formula for the organic compound urea. Urea is generated by the excretory systems of animals.
Which has higher boiling point Urea or Sodium chloride?
urea
Where in the body and from what compound is urea produced?
liver. Urea comes from the breakdown of proteins ultimately. But there are lots of conversions along the way between amino acids. Ammonia is one of the nitrogen donors to make urea
What was the average diffusion rate of urea when the 200 MWCO membrane was used as a barrier?
Once diffusion occurs it does not matter the MWCO of the membrane, but it depends on difference of concentration, as it is said in Fick's first law.
What do they mean by MWCO in dialysis tubing?
First of all, the filtration in dialysis doesn't happen in the tubing. Rather it happens in an artificial kidney called the dialyzer. It's essentially a dense bundle of thousands of fibers which make up the filter itself. The fibers allow the blood to pass through the dialyzer and the potassium and bicarbonate solution used to mix with the blood crosses over the fibers, cleaning the blood via filtration. MWCO (molecular weight cut off) in dialysis simply means the amount of molecules that are allowed to pass through the membranes. Proteins are too big to pass by design as we don't want to "wash away" the good stuff. Wastes like urea, nitrogen etc are allowed to pass through and out of the blood before the blood returns to the patient. Generally, the bigger the patient, the more filtration is required, so the higher the MWCO is. Hope this helps!
Damage of RNA by NaCl?
NaCl will not harm RNA. In fact, it is sometimes used as an elution buffer for RNA-Urea gels.
What substances in the blood pass through the partially permeable membrane into the kidneys?
As the dialysis fluid has no urea in it, there is a large concentration gradient - meaning that urea moves across the partially permeable membrane, from the blood to the dialysis fluid, by diffusion. This is very important as it is essential that urea is removed from the patients' blood.
What solutes typically diffuse from the patients blood during dialysis?
urea, uric acid, nacl, creatinine, phosphates
Where is urea removed from the body?
By filtration through the kidney.
Why don't red blood cells pass through the dialysis tube?
The reason why red blood cells don't pass through the dialysis tube is because red blood cells are too large to fit through the pores in the membranes but urea and salt flow through membranes into the sterile solution and are removed.
Where is urea removed from after it has passed through the blood?
The Kidneys, where the blood/urea thing takes place.
How does the urea enters the urinary system?
through the blood
What is urea in the urine?
Urea is a waste product produced by the body, which it needs to get rid of, and it does that through the kidneys, by excreting urea in urine (NH2)2CO... It comes from the breakdown of Amino Acids.
Will the red and white blood cells and platelets which make ap the blood be remove while urea is removed fro the blood?
No, the blood cells are too large to pass through the dialysis membrane.
Will the red and white blood cells and platelets which make up the blood be remove while urea is remove from the blood why?
No, red and white blood cells and platelets are not removed when urea is removed from the blood. Urea is a waste product that is filtered out by the kidneys, while the red and white blood cells and platelets are important components of the blood that perform essential functions in the body.
