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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.
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Acid Strength and Molecular Structure03:05

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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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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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Structure of Benzene: Molecular Orbital Model01:18

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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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The psychodynamic perspective in psychology asserts that most personality functions operate unconsciously, outside of awareness. This means that the motives and emotions driving behavior often remain hidden, automatically buried in the unconscious mind as a defense mechanism to shield us from psychological distress. According to this theory, the unconscious mind contains thoughts, memories, and emotions that are too disturbing to face directly.
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In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
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BioMEMS and Cellular Biology: Perspectives and Applications
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Perspectives on Structural Molecular Biology Visualization: From Past to Present.

Arthur J Olson1

  • 1Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Journal of Molecular Biology
|July 17, 2018
PubMed
Summary

Molecular visualization technology has been crucial for structural molecular biology. Advances in technology have transformed how scientists view and interact with molecular structures, driving progress in the field.

Keywords:
molecular graphicsmolecular modelingstructural molecular biologyvisualization

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Area of Science:

  • Structural molecular biology
  • Biophysics
  • Computational biology

Background:

  • Visualization is a fundamental tool in structural molecular biology.
  • The field's progress is intrinsically linked to visualization technologies.
  • Understanding molecular structures is key to biological research.

Purpose of the Study:

  • To describe the role of visualization in structural biology.
  • To trace the evolution of visualization techniques.
  • To explore the interplay between visualization technology and structural biology.

Main Methods:

  • Historical review of visualization techniques.
  • Analysis of technological advancements.
  • Discussion of the impact of visualization on structural studies.

Main Results:

  • Visualization has evolved significantly with technological progress.
  • Technical advances have reshaped molecular structure interaction.
  • Structural biology has both influenced and been influenced by visualization technology.

Conclusions:

  • Visualization remains a cornerstone of structural molecular biology.
  • The co-evolution of technology and structural biology continues.
  • Future advancements in visualization will further drive biological discovery.