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Related Concept Videos

Punnett Squares01:00

Punnett Squares

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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
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Wedges

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Lumber

Lumber is derived from logs which are harvested, debarked, and processed into long pieces with a rectangular cross-section. The transformation of logs into lumber involves multiple steps, beginning with an automated saw that slices the log into slabs. These slabs are then transported via a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths.
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Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis
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Are you a lumper or a splitter?

William J Ledger1, Steven S Witkin

  • 1Department of Obstetrics and Gynecology, Weill Medical College of Cornell University, 525 East 68th Street, J-130, New York, NY 10021, USA. wjledger@med.cornell.edu

American Journal of Obstetrics and Gynecology
|May 26, 2006
PubMed
Summary

Individual genetic variations impact treatment outcomes. Personalized medicine, considering genetic polymorphisms, improves susceptibility assessments for conditions like recurrent vulvo-vaginal candidiasis and identifies risks for premature delivery.

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Area of Science:

  • Genetics and Personalized Medicine
  • Reproductive Health
  • Infectious Diseases

Background:

  • Current evidence-based medicine often relies on large-scale studies that may overlook individual genetic differences.
  • Genetic polymorphisms are linked to increased susceptibility in certain conditions, such as recurrent vulvo-vaginal candidiasis (RVVC).
  • Identifying genetic factors in mother and fetus is crucial for understanding risks associated with pregnancy.

Purpose of the Study:

  • To highlight the importance of incorporating individual genetic variations into medical analysis.
  • To demonstrate how genetic insights can refine risk assessments for specific health conditions.
  • To advocate for more individualized therapeutic strategies based on comprehensive patient information.

Main Methods:

  • Analysis of genetic polymorphisms in patient populations.
  • Application of highly sensitive non-culture methods for microbial detection.
  • Integration of genetic data with clinical observations.

Main Results:

  • Genetic polymorphisms identified as contributing factors to recurrent vulvo-vaginal candidiasis susceptibility.
  • Genetic analysis of mother and fetus revealed elevated risk factors for premature labor and delivery.
  • Demonstrated correlation between specific genetic profiles and increased susceptibility to infections and adverse pregnancy outcomes.

Conclusions:

  • Individual genetic characteristics are critical for accurate medical conclusions.
  • Personalized genetic information enables more precise risk stratification for conditions like RVVC and premature delivery.
  • Tailoring therapeutic interventions based on complete patient data, including genetics, enhances treatment efficacy.