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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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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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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Equations of Motion: Rectangular Coordinates and Cylindrical Coordinates01:21

Equations of Motion: Rectangular Coordinates and Cylindrical Coordinates

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Understanding the motion of particles is a fundamental aspect of classical mechanics, and the choice of the coordinate system plays a pivotal role in unraveling the complexities of their dynamics.
When a particle moves relative to an inertial frame, the equations of motion can be expressed using rectangular components. If the motion is confined to the x-y plane, the equations having the x and y coordinates only can be used to simplify the mathematical representation.
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Spherical Coordinates01:23

Spherical Coordinates

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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
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Coordinate Plane01:21

Coordinate Plane

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The Cartesian coordinate plane is a fundamental structure in mathematics that enables the visualization of relationships between numerical values in two dimensions. It is formed by two intersecting number lines: a horizontal x-axis and a vertical y-axis. These axes meet at the origin, the point where both values are zero. Their intersection divides the plane into four quadrants labeled in a counterclockwise direction starting from the upper right.An ordered pair of numbers represents every...
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Related Experiment Video

Updated: Jan 29, 2026

Coordinate Mapping of Hyolaryngeal Mechanics in Swallowing
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Berberine: A Negentropic Modulator for Multi-System Coordination.

Xiaolian Tian1, Qingbo Chen1, Yingying He1

  • 1State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.

International Journal of Molecular Sciences
|January 28, 2026
PubMed
Summary
This summary is machine-generated.

Berberine (BBR) restores metabolic, immune, and microbial balance by regulating key cellular pathways. This systems-level approach enhances glucose-lipid metabolism and reduces inflammation, offering broad therapeutic potential.

Keywords:
AMPK-centered mechanistic hubBerberinecombination strategies of BBR

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Area of Science:

  • Pharmacology and Systems Biology
  • Metabolic and Inflammatory Diseases
  • Natural Product Therapeutics

Background:

  • Berberine (BBR) is a natural alkaloid with established benefits for glucose-lipid metabolism and inflammation.
  • Its therapeutic effects stem from coordinating complex biological networks rather than a single target.
  • Understanding BBR's systems-level action is crucial for optimizing its clinical application.

Purpose of the Study:

  • To elucidate the mechanistic hub and multi-organ axes through which BBR exerts its systemic effects.
  • To highlight BBR's role as a negentropic modulator restoring physiological order.
  • To explore the translational potential of BBR, including combination strategies and novel derivatives.

Main Methods:

  • Analysis of preclinical and human studies on Berberine's effects.
  • Investigation of the AMP-activated Protein Kinase (AMPK)-centered mechanistic hub.
  • Examination of BBR's interactions with gut, mitochondrial, and epigenetic factors.
  • Review of multi-organ axes (gut-liver-adipose-vascular) influenced by BBR.

Main Results:

  • BBR regulates a central hub involving AMPK, SIRT1/3, NF-κB, and NLRP3 pathways.
  • It enhances intestinal barrier function, modulates gut microbiota and bile acids, and improves redox balance.
  • BBR promotes systemic homeostasis by coordinating energy, immune, and microbial circuits.
  • Combination therapies and derivatives like Berberine ursodeoxycholate (HTD1801) show enhanced efficacy.

Conclusions:

  • Berberine acts as a systems-level modulator, restoring physiological order by reducing metabolic entropy.
  • Its ability to recouple interconnected biological circuits offers significant therapeutic promise for metabolic and inflammatory conditions.
  • Further research and clinical trials, including novel derivatives, are warranted to fully leverage BBR's potential.