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相关概念视频

piRNA - Piwi-interacting RNAs02:57

piRNA - Piwi-interacting RNAs

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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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相关实验视频

Updated: Jul 28, 2025

Application of Genetically Encoded Fluorescent Nitric Oxide (NO•) Probes, the geNOps, for Real-time Imaging of NO• Signals in Single Cells
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没有,没有,没有,没有.

Parikshit Samjubhai Paredi1, Madhu Pandey1, Ezhava Manu Manohar1

  • 1Institute of Infrastructure, Technology, Research and Management (IITRAM), Maninagar, Ahmedabad, Gujarat, India.

Environmental science and pollution research international
|June 3, 2023
PubMed
概括
此摘要是机器生成的。

一种新型的四核复合物固定在硫酸功能化的MCM-48上,有效地从水中去除有毒染料水晶紫色和甲蓝色. 这种可重复使用的复合材料在短短15分钟内达到99%以上的吸附率.

关键词:
具有酸功能的MCM-48是具有酸功能的.水晶紫罗兰的颜色是什么染料吸附吸附方式甲基烯蓝色是什么颜色四核Ni复合体是一个四核Ni复合体.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 环境化学环境化学
  • 纳米技术 纳米技术

背景情况:

  • 像水晶紫色 (CV) 和甲基蓝色 (MB) 这样的有毒阴阳性染料对水质构成重大威胁.
  • 从废水中去除染料的有效和可持续方法对于环境保护至关重要.

研究的目的:

  • 为了合成和表征一种新的四核复合物,[Ni4(LH) 4) ·CH3CN (1).
  • 将复合物固定在硫酸功能化的MCM-48 (MCM-48-SO3H) 上,以增强染料吸附.
  • 研究由此产生的复合材料在从水溶液中去除CV和MB染料时的效率.

主要方法:

  • 使用NMR,ICP和FT-IR等技术合成和表征四核复合体.
  • 通过将复合物固定在MCM-48-SO3H上来制备复合材料.
  • 吸附性研究用于评估染料去除效率,优化吸附剂剂量,温度,pH值和接触时间等参数.
  • 使用SEM,BET和粉末XRD.对复合材料的表征.

主要成果:

  • 合成的[Ni4(LH) [4]·CH3CN复合物成功地被纳入了MCM-48-SO3H矩阵.
  • 复合材料对CV和MB染料都显示出高吸附效率 (>99%).
  • 最佳吸附条件被确定为0.2 mg/ml的吸附剂剂量,10 ppm的染料度,pH为6-7,25 °C,接触时间为15分钟.
  • 吸附剂材料表现出极好的可重复使用性,在三个周期内保持高吸附能力.

结论:

  • 集成的Ni4复合物MCM-48-SO3H复合物是一种高效和强大的吸附剂,用于有毒的阴阳性染料.
  • 该材料可以快速有效地去除CV和MB,在短时间的接触时间内超过99%的去除.
  • 这种新型吸附剂由于其高效率和可重复使用性,为废水处理提供了有希望的解决方案.