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Related Concept Videos

Molecular Compounds: Formulas and Nomenclature03:10

Molecular Compounds: Formulas and Nomenclature

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Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. 
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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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Coordination Compounds and Nomenclature02:54

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Ionic Compounds: Formulas and Nomenclature03:34

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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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During the development of a new pharmaceutical, the manufacturer initially assigns a code name to the drug. Once approved, the drug receives a United States Adopted Name (USAN)—a generic, nonproprietary designation. Upon being listed in the United States Pharmacopeia, this nonproprietary name becomes the drug's official name. Additionally, the manufacturer assigns a proprietary name or trademark, which serves as the brand name under which the drug is marketed. It is worth noting that...
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Nomenclature of Alkenes02:29

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The IUPAC naming system for alkenes replaces -an- with -en- in the corresponding parent alkanes. Accordingly, a simple alkene replaces the -ane suffix of the alkane with -ene.
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Related Experiment Video

Updated: Feb 3, 2026

Measuring Dengue Virus RNA in the Culture Supernatant of Infected Cells by Real-time Quantitative Polymerase Chain Reaction
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Time to Harmonize Dengue Nomenclature and Classification.

Lize Cuypers1,2, Pieter J K Libin3,4, Peter Simmonds5

  • 1Department of Microbiology and Immunology, Rega Institute for Medical Research, Clinical and Epidemiological Virology, KU Leuven, 3000 Leuven, Belgium. lize.cuypers@kuleuven.be.

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|October 21, 2018
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Summary

Dengue virus (DENV) genetic diversity presents challenges due to inconsistent nomenclature and classification. Harmonizing DENV studies requires re-evaluating its genetic structure for better understanding and control.

Keywords:
classificationdengue virusdiversitynomenclature

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Area of Science:

  • Virology
  • Epidemiology
  • Genetics

Background:

  • Dengue virus (DENV) causes 390 million infections annually, with significant morbidity and mortality.
  • Increasing outbreak frequency and geographical spread highlight DENV's global public health threat.
  • DENV's genetic diversity, organized into serotypes, genotypes, and clades, complicates epidemiological analysis.

Purpose of the Study:

  • To address the lack of standardized nomenclature and classification for Dengue virus genotypes and sub-genotypic clades.
  • To identify key challenges hindering consistent analysis of DENV genetic diversity.
  • To advocate for a re-evaluation and harmonization of DENV genetic studies.

Main Methods:

  • Review of current DENV genetic classification systems.
  • Identification of inconsistencies in genotype nomenclature and clade definitions.
  • Analysis of challenges in reporting DENV antigenic diversity.

Main Results:

  • Five key challenges identified: undefined genotype/clade definitions, dual nomenclature systems, lack of standardized classification, and no consensus on reporting antigenic diversity.
  • Current systems impede comprehensive clinical and epidemiological analysis of DENV.
  • Inconsistent DENV genetic characterization hinders global research efforts.

Conclusions:

  • Urgent need to re-evaluate Dengue virus genetic diversity.
  • Harmonization of DENV nomenclature and classification is essential for future studies.
  • Standardized approaches will improve understanding and management of dengue outbreaks.