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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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Glaucoma is a chronic disease with progressive degeneration of optic nerve fibers resulting in decreased visual field. Elevated intraocular pressure is considered the most important and the only treatable risk factor. This manuscript describes a simple, surgeon-friendly, non-incisional technique, named Ultrasound Cyclo Plasty, for reducing intraocular pressure in glaucoma...
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Here, we describe an innovative method to determine complement receptor 1 (CR1) length polymorphisms for use in several applications, particularly the assessment of susceptibility to diseases such as Alzheimer's disease (AD). This method could be useful to better understand the role of CR1 isoforms in the pathogenesis of...
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We present a new polyacrylamide hydrogel, called hydroxy-PAAm, that allows a direct binding of ECM proteins with minimal cost or expertise. The combination of hydroxy-PAAm hydrogels with microcontact printing facilitates independent control of many cues of the natural cell microenvironment for studying cellular...
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Pyrosequencing assays enable the robust and rapid genotyping of mitochondrial DNA single nucleotide polymorphisms in heteroplasmic cells or tissues.
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Video Experimental Relacionado

Updated: Jan 20, 2026

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Polimorfo triclínico del ácido 1-hidroxi-ciclohexanocarboxílico

Lubabalo Ndima1, Eric Cyriel Hosten1, Richard Betz1

  • 1Nelson Mandela University, Summerstrand Campus, Department of Chemistry, University Way, Summerstrand, PO Box 77000, Port Elizabeth, 6031, South Africa.

IUCrData
|January 19, 2026
PubMed
Resumen

Este estudio caracteriza C7H12O3, un ácido alfa-hidroxi-carboxílico. El análisis molecular revela que los enlaces de hidrógeno forman estructuras laminares en su red cristalina.

Palabras clave:
estructura cristalinapolimorfo

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Área de la Ciencia:

  • Cristalografía
  • Química Orgánica
  • Ciencia de Materiales

Sus antecedentes:

  • Los ácidos alfa-hidroxi-carboxílicos son compuestos orgánicos con diversas aplicaciones.
  • Comprender la estructura cristalina de dichos compuestos es crucial para predecir sus propiedades físicas y químicas.

Objetivo del estudio:

  • Elucidar la estructura cristalina del compuesto titular, C7H12O3.
  • Investigar las interacciones intermoleculares que rigen su disposición en estado sólido.

Principales métodos:

  • Se empleó la difracción de rayos X de monocristal para determinar la estructura molecular y cristalina.
  • Se realizó un análisis de las redes de enlaces de hidrógeno.

Principales resultados:

  • La unidad asimétrica contiene dos moléculas de C7H12O3.
  • Se identificaron enlaces de hidrógeno O-H⋯O como la principal fuerza intermolecular.
  • Estos enlaces de hidrógeno organizan las moléculas en láminas perpendiculares al eje b.

Conclusiones:

  • La estructura cristalina de C7H12O3 se caracteriza por disposiciones laminares impulsadas por enlaces de hidrógeno.
  • Esta visión estructural es fundamental para posibles aplicaciones en ciencia de materiales y síntesis orgánica.