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Related Concept Videos

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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Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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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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Properties of Transition Metals

30.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Trauma transitional care coordination: A mature system at work.

Erin C Hall1, Rebecca L Tyrrell, Karen E Doyle

  • 1From the Department of Surgery (E.C.H.), MedStar Washington Hospital Center, Washington, DC; Department of Surgery (E.C.H.), Georgetown University School of Medicine, Washington, DC. R Adams Cowley Shock Trauma Center (R.T., K.D., T.M.S., D.M.S.), University of Maryland School of Medicine, Baltimore, Maryland.

The Journal of Trauma and Acute Care Surgery
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Summary

The Trauma Transitional Care Coordination (TTCC) Program effectively reduced 30-day readmissions for high-risk trauma patients. This nursing-driven initiative improved outcomes for specific patient groups, saving over a million dollars annually.

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Area of Science:

  • Trauma Care
  • Healthcare Management
  • Patient Readmission Reduction

Background:

  • The Trauma Transitional Care Coordination (TTCC) Program was previously shown to reduce 30-day readmissions in high-risk trauma patients.
  • Program maturation has led to further improvements in readmission rates for specific patient cohorts.

Purpose of the Study:

  • To evaluate the effectiveness of the matured TTCC program in reducing 30-day readmissions.
  • To identify specific patient populations that benefited most from the TTCC interventions.

Main Methods:

  • The TTCC program is a nursing-driven initiative providing post-discharge support.
  • Interventions include timely patient calls, medication reconciliation, appointment coordination, and problem-solving.
  • Data on 30-day readmissions were collected via the Health Services Cost Review Commission database.

Main Results:

  • 475 patients were enrolled; 54.5% had Medicaid, 13.5% Medicare, and 10.5% private insurance.
  • High-severity injury patients (3 or 4) comprised 73% of the cohort.
  • Significant reductions in 30-day readmissions were observed for patients with lower-extremity injury (10% vs. 16%), complicated tracheostomy (13% vs. 24%), and bowel procedures (11% vs. 27%).

Conclusions:

  • Targeted outpatient care coordination significantly decreases 30-day readmission rates for high-risk patients.
  • The TTCC program's success in specific patient groups demonstrates its value.
  • The program yields substantial financial benefits, estimated at over $1 million annually through quality-based reimbursement.