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Related Concept Videos

Molar Mass01:54

Molar Mass

87.0K
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties.
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Applications of the Ideal Gas Law: Molar Mass, Density, and Volume03:43

Applications of the Ideal Gas Law: Molar Mass, Density, and Volume

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The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT,  suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume.
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pre-mRNA Processing02:01

pre-mRNA Processing

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
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Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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Pre-mRNA Processing: RNA Splicing01:36

Pre-mRNA Processing: RNA Splicing

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Related Experiment Video

Updated: Feb 8, 2026

Murine Model of Advanced Periodontitis Induced by Nylon Ligature in the Second Upper Molar
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Murine Model of Advanced Periodontitis Induced by Nylon Ligature in the Second Upper Molar

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Pre-emptive Intracoronal Radiolucency in First Permanent Molar.

Mariana C Ilha1, Paulo F Kramer2, Simone H Ferreira2

  • 1PhD Student, Department of Pediatric Dentistry, Lutheran University of Brazil (ULBRA), Canoas, RS, Brazil.

International Journal of Clinical Pediatric Dentistry
|July 12, 2018
PubMed
Summary

Pre-eruptive intracoronal radiolucency (PECR) is a rare dental finding diagnosed via radiographs. This case report details successful surgical exposure and restoration of a PECR in a pediatric patient.

Keywords:
DentinDentition permanentTooth crownTooth resorption.

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Area of Science:

  • Pediatric Dentistry
  • Dental Radiology
  • Oral Pathology

Background:

  • Pre-eruptive intracoronal radiolucency (PECR) is a rare condition affecting developing teeth.
  • Its etiology remains largely unknown, often presenting asymptomatically.
  • Diagnosis typically relies on routine dental radiographic examinations.

Observation:

  • A case of PECR in the coronal dentin of a first permanent molar in an 8-year-old girl is presented.
  • The lesion was identified through routine radiographic screening.
  • The patient was asymptomatic prior to diagnosis.

Findings:

  • Surgical exposure of the unerupted tooth was performed.
  • Following eruption, the radiolucent lesion was accessed and the tooth was restored.
  • An 18-month follow-up demonstrated successful management of the PECR.

Implications:

  • This case highlights the importance of radiographic diagnosis in identifying rare dental anomalies like PECR.
  • It demonstrates a viable clinical approach for managing PECR, involving surgical intervention and restoration.
  • Further research into the etiology and long-term outcomes of PECR is warranted.