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Urea Cycle01:23

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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
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Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Related Experiment Video

Updated: Apr 1, 2026

Microdialysis of Excitatory Amino Acids During EEG Recordings in Freely Moving Rats
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Microdialysis of Excitatory Amino Acids During EEG Recordings in Freely Moving Rats

Published on: November 8, 2018

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Noncirrhotic hyperammonemia causing relapsing altered mental status.

Chibuzo Clement Odigwe1, Binod Khatiwada1, Christopher Holbrook1

  • 1Department of Medicine, St. Joseph Hospital, 2900 North Lake Shore Drive, Chicago, Illinois. Dr. Upadhyay is currently with the Department of Medicine, University of Nevada, Reno.

Proceedings (Baylor University. Medical Center)
|October 2, 2015
PubMed
Summary
This summary is machine-generated.

Noncirrhotic hyperammonemia, a condition causing brain dysfunction, is increasingly recognized. This case highlights a patient with relapsing altered mental status diagnosed with this disorder.

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Area of Science:

  • Neurology
  • Hepatology
  • Internal Medicine

Background:

  • Hyperammonemia is a known cause of encephalopathy, typically associated with liver disease.
  • The clinical significance of noncirrhotic hyperammonemia is gaining increasing recognition in medical literature.

Observation:

  • A male patient presented with recurrent episodes of altered mental status.
  • Initial assessments were conducted at our hospital for the presenting symptoms.

Findings:

  • The patient was diagnosed with noncirrhotic hyperammonemia.
  • This diagnosis explains the relapsing neurological symptoms observed.

Implications:

  • This case underscores the importance of considering noncirrhotic hyperammonemia in patients with unexplained encephalopathy.
  • Further research into the mechanisms and management of noncirrhotic hyperammonemia is warranted.