nucleolus

简明释义

英[ˌnjuːklɪˈəʊləs]美[njuˈkliələs]

n. 核；[细胞] 核仁；细胞核

复 数 n u c l e o l i

英英释义

单词用法

同义词

反义词

例句

1.The nucleus possesses a center nucleolus with fibrillar centers, dense fibrillar component and granular component.

研究结果表明：细胞核具有中央核仁，核仁可以看到明显的纤维中心、致密纤维中心和颗粒结构。

2.These changes are discussed in relation to current knowledge about nucleolar structure as well as the organization of chromosomes and transcription factories in nuclear regions outside the nucleolus.

讨论了涉及到有关核仁结构的当前知识的这些变化，以及在核仁外部的细胞核区域中染色体和转录工厂的组织。

3.Nucleolar structure is one of the most obvious symbols. However, little is known about its evolutionary origin. Some previous studies implied that Giardia has no nucleolus.

核仁是真核细胞最显著的标志之一，但关于其进化上的起源迄今仍所知甚少，已发现有迹像表明原始性真核生物贾第虫没有核仁。

4.The nucleolus has been studied for a long time but there have been still many arguments about nucleolar structures and function.

虽然人们对于核仁的认识已经有很长的历史了，但是人们对于核仁结构和功能方面的认识仍然有很多不同的意见。

5.The nucleolus is the most obvious structure seen in the nucleus of a eucaryotic cell when viewed in the light microscope.

核仁是在光学显微镜下看到细胞核中最明显结构。

6.Type B2, B3 thymoma have obvious atypia with rich in euchromatin and distinct nucleolus in nuclei and broad cytoplasm with projections.

B3型胸腺瘤异型性较明显，常染色质较丰富，核仁明显，细胞质宽大，有突起。

7.Identifying the changes of the refractive indices in part of the nucleolus of the cancer cells.

找出部分癌症细胞内核中折射率的变化。

8.The nucleolus is responsible for producing ribosomal RNA.

核仁负责产生核糖体RNA。

9.During cell division, the nucleolus disappears and reappears in the daughter cells.

在细胞分裂过程中，核仁消失并在子细胞中重新出现。

10.Scientists study the structure of the nucleolus to understand its role in protein synthesis.

科学家研究核仁的结构以了解其在蛋白质合成中的作用。

11.A larger nucleolus can indicate increased ribosome production in a cell.

较大的核仁可能表明细胞中增加了核糖体的生产。

12.The nucleolus is often referred to as the 'ribosome factory' of the cell.

核仁通常被称为细胞的“核糖体工厂”。

作文

The cell is often referred to as the building block of life, and within each cell lies a complex structure known as the nucleus. Inside the nucleus, there is a small, dense region called the nucleolus (核仁), which plays a crucial role in the production of ribosomes. Ribosomes are essential for protein synthesis, making the nucleolus (核仁) an integral part of cellular function. To understand the significance of the nucleolus (核仁), we first need to explore its composition and function. The nucleolus (核仁) is primarily made up of RNA, DNA, and proteins. It is not surrounded by a membrane, which distinguishes it from other organelles in the cell. Instead, it forms around specific chromosomal regions known as nucleolar organizing regions (NORs). These regions contain genes that code for ribosomal RNA (rRNA), which is the primary component of ribosomes. The process of ribosome biogenesis begins in the nucleolus (核仁). Here, rRNA is synthesized and combined with ribosomal proteins imported from the cytoplasm. This assembly process is highly regulated and occurs in several stages, ultimately leading to the formation of pre-ribosomal particles. Once these particles are fully assembled, they are transported out of the nucleolus (核仁) into the cytoplasm, where they mature into functional ribosomes. The importance of the nucleolus (核仁) extends beyond just ribosome production. It is also involved in various cellular processes, including the regulation of the cell cycle and stress responses. For instance, during times of cellular stress, the activity of the nucleolus (核仁) can be altered, leading to changes in ribosome production and, consequently, protein synthesis. This adaptability highlights the nucleolus (核仁) as a key player in maintaining cellular homeostasis. Moreover, research has shown that the nucleolus (核仁) may have implications in cancer biology. Abnormalities in the structure or function of the nucleolus (核仁) can lead to dysregulated ribosome biogenesis, which is a hallmark of many cancer cells. Understanding the mechanisms governing the nucleolus (核仁) could provide insights into potential therapeutic targets for cancer treatment. In conclusion, the nucleolus (核仁) is a vital component of the cell that is often overlooked in discussions about cellular biology. Its primary role in ribosome production is crucial for protein synthesis, while its involvement in regulating various cellular processes underscores its importance. As we continue to explore the complexities of cellular functions, the nucleolus (核仁) remains an area of significant interest for researchers seeking to unravel the mysteries of life at the molecular level.

细胞通常被称为生命的基本单位，而在每个细胞内部则存在一个复杂的结构，称为细胞核。在细胞核内，有一个小而致密的区域，称为核仁（nucleolus），它在核糖体的生成中发挥着至关重要的作用。核糖体对于蛋白质合成是必不可少的，因此核仁（nucleolus）是细胞功能的一个重要组成部分。 要理解核仁（nucleolus）的意义，我们首先需要探索它的组成和功能。核仁（nucleolus）主要由RNA、DNA和蛋白质组成。它没有膜包围，这使得它与细胞中的其他细胞器有所不同。相反，它围绕特定的染色体区域形成，这些区域被称为核仁组织区域（NORs）。这些区域包含编码核糖体RNA（rRNA）的基因，而rRNA是核糖体的主要成分。 核糖体生物合成的过程始于核仁（nucleolus）。在这里，rRNA被合成并与从细胞质中进口的核糖体蛋白结合。这一组装过程高度受控，并分为几个阶段，最终导致前核糖体颗粒的形成。一旦这些颗粒完全组装，它们就会被运输出核仁（nucleolus）进入细胞质，在那里成熟为功能性核糖体。 核仁（nucleolus）的重要性不仅限于核糖体的生产。它还参与各种细胞过程，包括细胞周期的调节和应激反应。例如，在细胞应激期间，核仁（nucleolus）的活性可能会发生改变，从而导致核糖体生产和蛋白质合成的变化。这种适应性突显了核仁（nucleolus）在维持细胞稳态中的关键作用。 此外，研究表明，核仁（nucleolus）可能在癌症生物学中具有重要意义。核仁（nucleolus）的结构或功能异常可能导致核糖体生物合成失调，这是许多癌细胞的一个特征。理解核仁（nucleolus）所支配的机制可能为癌症治疗提供潜在的治疗靶点。 总之，核仁（nucleolus）是细胞的重要组成部分，但在细胞生物学讨论中常常被忽视。它在核糖体生产中的主要作用对蛋白质合成至关重要，而其在调节各种细胞过程中的参与则进一步强调了其重要性。随着我们继续探索细胞功能的复杂性，核仁（nucleolus）仍然是研究人员寻求揭开生命分子层面奥秘的重要领域。