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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
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Cómo surgió el LHC.

Chris Llewellyn Smith1

  • 1UK Atomic Energy Authority Culham Division, Culham Science Centre, Abingdon OX14 3DB, UK. chris.llewellyn-smith@ukaea.org.uk

Nature
|July 20, 2007
PubMed
Resumen

Asegurar la aprobación para esfuerzos científicos masivos como el Gran Colisionador de Hadrones implica complejas negociaciones políticas y una importante planificación financiera. Estos proyectos a gran escala requieren una cuidadosa consideración tanto del mérito científico como de la viabilidad económica.

Área de la Ciencia:

  • Física de las altas energías.
  • Física de las partículas física de partículas.
  • Infraestructura científica a gran escala para el desarrollo científico.

Sus antecedentes:

  • El Gran Colisionador de Hadrones (LHC) representa una empresa monumental en la investigación de la física de partículas.
  • La aprobación de proyectos para instalaciones de esta escala está influenciada por factores no científicos.

Objetivo del estudio:

  • Analizar las dimensiones políticas y financieras que influyen en la aprobación de proyectos científicos a gran escala.
  • Comprender la interacción entre la ambición científica, la voluntad política y las realidades económicas.

Principales métodos:

  • Análisis cualitativo de los procesos históricos de aprobación de proyectos.
  • Estudio de caso centrado en el Gran Colisionador de Hadrones.

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  • Examen de los modelos de financiación y los esfuerzos de cabildeo político.

    • Principales resultados:

    • La aprobación del proyecto depende en gran medida del consenso político y de la obtención de una financiación sustancial.
    • Las altas finanzas y las maniobras políticas son componentes críticos, a menudo eclipsando consideraciones puramente científicas.
    • El éxito de la ciencia a gran escala requiere una navegación hábil de los paisajes gubernamentales y financieros.

    Conclusiones:

    • El éxito de proyectos como el LHC depende de estrategias políticas y financieras efectivas.
    • Las futuras iniciativas científicas a gran escala deben integrar una sólida planificación política y financiera desde el principio.
    • La comprensión de estos factores no científicos es crucial para el avance de la ciencia fronteriza.