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Nuclear Export01:42

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
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Classifying Matter by State02:49

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Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars. 
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Export of Mitochondrial and Chloroplast Genes02:19

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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Classifying Matter by Composition03:35

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Matter: Pure Substances and Mixtures
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Electrostatic Method to Remove Particulate Organic Matter from Soil
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¿Las plataformas continentales exportan materia orgánica?

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    Los ecosistemas marinos costeros no exportan el 90% del fitoplancton. La mayor parte del carbono orgánico se consume en la plataforma continental, no secuestrado en alta mar, lo que desafía las hipótesis de exportación anteriores.

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    Área de la Ciencia:

    • Ecología marina
    • Ciclos biogeoquímicos
    • La oceanografía

    Sus antecedentes:

    • Los ecosistemas marinos costeros pueden tener una producción y un consumo desequilibrados de materia orgánica.
    • Una hipótesis sugirió que el 90% de la floración del fitoplancton de primavera se exporta, secuestrando carbono en la ladera continental.

    Objetivo del estudio:

    • Para probar la hipótesis de una exportación significativa de carbono orgánico desde las plataformas continentales.
    • Investigar el equilibrio entre la producción y el consumo de materia orgánica en los entornos marinos costeros.

    Principales métodos:

    • Resumiendo los hallazgos del experimento de los Procesos de Intercambio en el borde de la estantería (SEEP).
    • Analizando los presupuestos de carbono orgánico, el depósito de sedimentos y la biomasa en la ladera continental.

    Principales resultados:

    • El experimento SEEP no encontró un desequilibrio positivo en el presupuesto de carbono orgánico.
    • La deposición de sedimentos y la biomasa en la ladera continental fueron modestas, no apoyando la exportación a gran escala.
    • Se exporta una pequeña fracción de phytodetritus de la plataforma continental; la mayor parte se consume en la plataforma.

    Conclusiones:

    • Se rechaza la hipótesis del 90% de exportación de fitoplancton.
    • El consumo de microbios pelágicos y los retrasos estacionales entre la producción y el consumo son factores cruciales en el ciclo del carbono orgánico.
    • La materia orgánica se consume principalmente dentro del ecosistema de la plataforma continental.