Constitutional Heterotopy
Constitutional Heterotopy - Related Videos
02:18
Constitutional Isomers of Alkanes
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2023
Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism. The linear isomer of an alkane is prefixed by the term “n”; hence a linear isomer of pentane is known as n-pentane. Based on the type of branching, some of the branched isomers are given...
01:27
Constitutive and Regulated Gene Expression
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2025
Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
10:03
Development of Leishmania Species Strains with Constitutive Expression of eGFP
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2023
Here, we describe the methodology used for generating L. panamensis and L. donovani strains expressing the gene for eGFP as a stable integrated transgene using the pLEXSY system. Transfected parasites were cloned by limiting dilution, and clones with the highest fluorescence intensity in both species were selected for further use in drug screening assays.
09:34
Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
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Cited by 41 •
2018
Targeted next-generation sequencing is a time- and cost-efficient approach that is becoming increasingly popular in both disease research and clinical diagnostics. The protocol described here presents the complex workflow required for sequencing and the bioinformatics process used to identify genetic variants that contribute to disease.
09:35
Constitutive and Inducible Systems for Genetic In Vivo Modification of Mouse Hepatocytes Using Hydrodynamic Tail Vein Injection
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Cited by 7 •
2018
Hydrodynamic tail vein injection of transposon-based integration vectors enables stable transfection of murine hepatocytes in vivo. Here, we present a practical protocol for transfection systems that enables the long-term constitutive expression of a single transgene or combined constitutive and doxycycline-inducible expression of a transgene or miR-shRNA in the liver.
FAQs
The decisive result is not simply that two sites are substituted, but that the two substitutions produce different connectivities. Because connectivity specifies which atoms are linked and how, different products show that the original positions were constitutionally nonequivalent. This makes the test a structural criterion rather than an observation based only on position or appearance.
The distinction depends on what changes when one position is replaced. Constitutional heterotopy is associated with different constitutional isomers, whereas homotopic and stereotopic relationships represent other forms of positional comparison. Using the replacement test helps classify the relationship according to constitutional connectivity instead of treating every nonequivalent-looking site as constitutionally different.
Molecular symmetry provides a framework for evaluating whether positions can be treated as equivalent during structural analysis. Constitutional heterotopy focuses the analysis on connectivity: if separate replacement at two positions leads to different connectivities, symmetry considerations must accommodate that constitutional distinction. This helps connect molecular structure with the way positions are classified.
Select the two positions being compared, introduce the same substituent at the first position, and then perform the corresponding replacement at the second position. Compare the resulting structures by their atom-to-atom connectivities. If the products differ constitutionally, the original positions satisfy the criterion for constitutional heterotopy.
The relationship can help predict whether nuclei associated with two positions may experience different chemical environments in NMR spectroscopy. It does not replace spectral measurement, but it provides structural reasoning for anticipating nonequivalent environments. Consequently, constitutional analysis can guide interpretation of NMR observations by linking possible differences in signals to molecular connectivity.
Different connectivity relationships can make substitution at one position structurally distinct from substitution at another. Constitutional heterotopy therefore clarifies why alternative reaction sites may lead to different constitutional products rather than interchangeable outcomes. In chemistry, this provides a framework for relating the identity of a reacting position to the structures formed during product analysis.