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Phosphodiester Linkages01:01

Phosphodiester Linkages

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Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Respiratory disorders, a prevalent health concern globally, are generally divided into two primary categories: upper and lower respiratory tract disorders. The categorization is based on the area of the respiratory system they affect.
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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Updated: Feb 1, 2026

Split-Ubiquitin Based Membrane Yeast Two-Hybrid MYTH System: A Powerful Tool For Identifying Protein-Protein Interactions
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Demystifying probabilistic linkage: Common myths and misconceptions.

J C Doidge1,2, K Harron3

  • 1Administrative Data Research Centre for England, University College London.

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Summary

Deterministic and probabilistic record linkage methods are often misunderstood. Their differences stem from implementation choices, not inherent traits, with probabilistic linkage offering greater flexibility and data-driven insights for tailored applications.

Keywords:
data linkagedata matchingdeterministic linkageelectronic health recordsmedical record linkageprobabilistic linkagerecord linkage

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Area of Science:

  • Data Science
  • Information Science
  • Computer Science

Background:

  • Record linkage is crucial for data integration, but distinctions between probabilistic and deterministic methods are often unclear.
  • Misconceptions about probabilistic linkage lead to its underutilization and mistrust in its results.
  • Current understanding often oversimplifies the differences, attributing them to inherent method properties rather than implementation details.

Purpose of the Study:

  • To clarify the distinctions between probabilistic and deterministic record linkage approaches.
  • To address misconceptions surrounding probabilistic linkage and its outputs.
  • To demonstrate how implementation choices influence linkage outcomes and guide users in selecting appropriate methods.

Main Methods:

  • Comparative analysis of probabilistic and deterministic record linkage procedures.
  • Examination of how design choices impact the outputs of both linkage methods.
  • Discussion of common misconceptions and their effect on method selection.

Main Results:

  • The differences between probabilistic and deterministic linkage are primarily implementation-dependent, not intrinsic.
  • Both methods can be tailored to achieve similar or different outcomes based on design decisions.
  • Probabilistic linkage offers greater flexibility, power, and data utilization when appropriately implemented.

Conclusions:

  • Clarifying implementation nuances can reduce mistrust in probabilistic linkage.
  • Understanding linkage design choices is key to selecting and tailoring methods for specific applications.
  • Probabilistic linkage, when well-implemented, provides a more powerful and flexible approach to record linkage.