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Related Concept Videos

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
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Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures
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Sequence Multiplicity within Spherical Nucleic Acids.

Ziyin N Huang, Lisa E Cole, Cassandra E Callmann

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    This summary is machine-generated.

    Spherical nucleic acids (SNAs) carrying two types of CpG oligonucleotides (ODNs) enhance cellular uptake and dendritic cell maturation. This dual-CpG SNA platform enables tailored combination therapeutics for improved cell signaling control.

    Keywords:
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    Area of Science:

    • Oligonucleotide chemistry
    • Immunology
    • Nanotechnology

    Background:

    • Spherical nucleic acids (SNAs) are nanoscale constructs with potential in targeted drug delivery.
    • Oligonucleotides (ODNs) can modulate immune responses via toll-like receptors (TLRs).
    • Combining different ODNs offers synergistic therapeutic effects.

    Purpose of the Study:

    • To synthesize and evaluate dual-CpG SNAs with programmed ratios of two distinct ODN classes.
    • To investigate the cellular uptake, codelivery, and intracellular retention of these dual-CpG SNAs.
    • To assess the impact of dual-CpG SNAs on dendritic cell maturation and immune signaling.

    Main Methods:

    • Synthesis of SNAs incorporating mixtures of class A and class B CpG ODNs.
    • Cellular uptake studies using flow cytometry.
    • Assessment of dendritic cell maturation markers (e.g., CD83, CD86).
    • Comparison with linear ODN mixtures and unconjugated SNAs.

    Main Results:

    • Dual-CpG SNAs demonstrated enhanced cellular uptake and codelivery of both ODN types compared to linear ODNs.
    • SNAs maintained high association of ODNs within cells over time.
    • Dual-CpG SNAs significantly augmented dendritic cell maturation compared to other delivery methods.

    Conclusions:

    • Dual-CpG SNAs represent a potent platform for delivering multiple immunostimulatory ODNs.
    • These structures facilitate controlled cellular signaling and enhance immune cell activation.
    • SNAs offer a promising approach for developing oligonucleotide-based combination therapeutics with tunable activities.