vacuoles

简明释义

英[ˈvæk.ju.əls]美[ˈveɪ.kju.oʊlz]

n. [细胞]液泡（vacuole 的复数）

英英释义

单词用法

同义词

反义词

例句

1.Tannin inclusions in vacuoles have also been demonstrated by the electron microscope.

液泡中的丹宁内含物也已用显微镜证实。

2.The cytoplasm of the parasite contained a large number of mitochondria, food vacuoles and polysaccharide granules.

胞质内含有大量线粒体、食物泡和多糖颗粒。

3.Malaria parasites reside in bubbles, called vacuoles, inside infected cells.

疟原虫位于感染细胞的空泡中，这些空泡被称作液泡。

4.Vacuoles are ubiquitous in the plant kingdom.

在植物界中液泡广泛存在。

5.So the particles in vacuoles of guard cell and epidermal cell proved to be protein.

因而初步证明保卫细胞和表皮细胞液泡所含颗粒状物质是蛋白质。

6.Remobilization of nitrate in leaf vacuoles of crops is closely related to nitrogen use efficiency of crop.

作物液泡中硝酸根离子的再调动和再利用与作物氮素高效利用关系密切。

7.Here are seen the lipid vacuoles within hepatocytes.

肝细胞的脂质空泡。

8.An autophagic activity of vacuoles has been suspected because of the presence in the cell SAP of material of cytoplasmic origin.

由于细胞液中存在着来源于细胞质的物质，液泡的自体吞噬活性曾受到怀疑。

9.Many of the neoplastic cells have clear vacuoles of mucin.

很多肿瘤细胞有明显的黏液空泡。

10.Animal cells have smaller vacuoles compared to plant cells.

与植物细胞相比，动物细胞的液泡 较小。

11.The function of vacuoles can vary greatly between different types of cells.

不同类型细胞的液泡 功能可能大相径庭。

12.Some protists use vacuoles to expel excess water from their bodies.

一些原生生物利用液泡 将多余的水排出体外。

13.The large central vacuole in a mature plant cell helps maintain turgor pressure.

成熟植物细胞中的大型中央液泡 有助于维持膨压。

14.In plant cells, vacuoles are essential for storing nutrients and waste products.

在植物细胞中，液泡 对于储存养分和废物是必不可少的。

作文

In the intricate world of biology, understanding cellular structures is crucial for grasping how life functions at a microscopic level. One of the most fascinating components of plant and fungal cells is the vacuoles, which are membrane-bound sacs that serve various essential roles. These organelles are primarily involved in storage, waste disposal, and maintaining turgor pressure within the cell. The importance of vacuoles cannot be overstated, as they contribute significantly to the overall health and functionality of the cell.Firstly, vacuoles are vital for storage. They can hold a variety of substances, including nutrients, water, and even toxic byproducts. In many plant cells, the central vacuole occupies a large portion of the cell's interior, often up to 90%. This space is filled with a solution known as cell sap, which contains dissolved sugars, ions, and other compounds that are essential for the plant's growth and metabolism. By storing these materials, vacuoles help ensure that the cell has access to necessary resources when needed, particularly during times of stress or limited availability.Moreover, vacuoles play a critical role in waste management. As cells metabolize nutrients, they produce waste products that need to be removed to maintain cellular health. Vacuoles act as a temporary holding area for these waste materials, isolating them from the rest of the cell until they can be disposed of properly. This function is particularly important in plant cells, where the accumulation of waste could lead to toxicity if not managed effectively. By sequestering waste products, vacuoles help preserve the integrity of the cell’s internal environment.Another significant function of vacuoles is their role in maintaining turgor pressure. Turgor pressure is the pressure of the cell contents against the cell wall, which is crucial for maintaining the plant’s structural integrity. When a plant cell is full of water, the vacuole swells, pushing against the cell wall and providing rigidity. This pressure helps the plant stand upright and supports its leaves and flowers. Conversely, when a plant lacks water, the vacuoles lose their volume, leading to wilting. Thus, vacuoles are essential for hydration and overall vitality of plants.Additionally, vacuoles can also have specialized functions depending on the type of cell. For instance, in certain types of plant cells, they may contain pigments that give flowers their color, or enzymes that aid in digestion. In some cases, vacuoles can even store defensive compounds to protect the plant from herbivores or pathogens. These adaptations illustrate the versatility of vacuoles and their ability to meet the specific needs of different cell types.In conclusion, vacuoles are indispensable components of plant and fungal cells, serving multiple functions that are essential for cellular health and survival. From storage and waste management to maintaining turgor pressure, these organelles play a pivotal role in ensuring that cells operate efficiently. Understanding the significance of vacuoles enhances our appreciation of cellular biology and the complex mechanisms that sustain life. As we continue to explore the intricacies of cellular structures, it becomes clear that every component, including vacuoles, contributes to the remarkable tapestry of life on Earth.

在生物学的复杂世界中，理解细胞结构对于掌握生命在微观层面上的运作至关重要。植物和真菌细胞中最迷人的组成部分之一是液泡，它们是膜结合的囊泡，起着多种重要的作用。这些细胞器主要涉及储存、废物处理和维持细胞内的膨压。液泡的重要性不容小觑，因为它们对细胞的整体健康和功能性贡献巨大。首先，液泡对储存至关重要。它们可以储存多种物质，包括营养物质、水分甚至有毒的副产品。在许多植物细胞中，中央液泡占据了细胞内部的大部分空间，通常高达90%。这个空间充满了一种称为细胞液的溶液，里面含有溶解的糖、离子和其他对植物生长和新陈代谢至关重要的化合物。通过储存这些材料，液泡帮助确保细胞在需要时能够获取必要的资源，特别是在压力或有限可用性时。此外，液泡在废物管理中也发挥着关键作用。当细胞代谢营养物质时，会产生需要去除的废物，以维持细胞健康。液泡充当这些废物的临时储存区，将它们与细胞的其余部分隔离，直到能够妥善处理。因此，这一功能在植物细胞中尤为重要，因为废物的积累如果不加以管理可能会导致毒性。通过隔离废物产品，液泡帮助保护细胞内部环境的完整性。液泡的另一个重要功能是维持膨压。膨压是细胞内容物对细胞壁的压力，这对维持植物的结构完整性至关重要。当植物细胞充满水分时，液泡膨胀，推动细胞壁并提供刚性。这种压力帮助植物直立，并支撑其叶子和花朵。相反，当植物缺水时，液泡失去体积，导致萎蔫。因此，液泡对植物的水合作用和整体活力至关重要。此外，液泡还可以根据细胞类型具有特定的功能。例如，在某些类型的植物细胞中，它们可能含有赋予花朵颜色的色素，或含有帮助消化的酶。在某些情况下，液泡甚至可以储存防御化合物，以保护植物免受食草动物或病原体的侵害。这些适应性展示了液泡的多功能性以及它们满足不同细胞类型特定需求的能力。总之，液泡是植物和真菌细胞不可或缺的组成部分，承担着对细胞健康和生存至关重要的多种功能。从储存和废物管理到维持膨压，这些细胞器在确保细胞高效运作方面发挥着关键作用。理解液泡的重要性增强了我们对细胞生物学的欣赏以及维持生命的复杂机制。随着我们继续探索细胞结构的复杂性，显然每个组成部分，包括液泡，都为地球上生命的非凡织锦做出了贡献。