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Molecular Structure and Acidity02:34

Molecular Structure and Acidity

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An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
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Range00:59

Range

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
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Long-Range Hierarchical Nanocrystal Assembly Driven by Molecular Structural Transformation.

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Researchers mimicked biomineralization using peptide higher-order structures (HOSs) to control platinum nanocrystal formation and assembly. This biomimetic approach enables precise nanoscale synthesis and long-range self-organization for programmable materials.

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Area of Science:

  • Biomineralization and biomimetic materials science.
  • Nanotechnology and materials self-assembly.
  • Peptide structure-function relationships.

Background:

  • Hierarchical control in biogenic mineral synthesis is challenging.
  • Biomineralization studies often neglect biomolecular higher-order structures (HOSs).
  • HOSs are critical for the long-range assembly of biominerals.

Purpose of the Study:

  • To explore peptide HOSs for guiding nanocrystal formation and hierarchical assembly.
  • To develop a biomimetic route and quantitative simulations for artificial mineral synthesis.
  • To understand the role of peptide secondary structure in nanocrystal morphology and assembly.

Main Methods:

  • Utilized a biomimetic approach with a specific peptide (T7) and platinum nanocrystals.
  • Employed quantitative simulations to study peptide HOSs and their effect on nanocrystal assembly.
  • Investigated the concentration-dependent structural transitions of the T7 peptide (ST-turn to β-sheet).

Main Results:

  • The T7 peptide promoted cubic platinum nanocrystal formation.
  • T7's secondary structure transitioned from ST-turn to β-sheet with increasing concentration.
  • The β-sheet conformation of T7 drove the self-assembly of Pt nanocrystals into linear, long-range arrays.
  • Demonstrated bio/nonbiogenic material specificity and nanoscale synthesis guided by HOSs.

Conclusions:

  • Biomolecular HOSs can precisely control nanocrystal formation and anisotropic assembly.
  • This study provides a novel biomimetic strategy for creating multiscale programmable structures.
  • Opens new avenues for designing advanced materials with hierarchical organization.