heterocyst

简明释义

英[ˈhetərəʊsɪst]美[ˈhetərəˌsɪst]

n. 异形胞；[植] 异形细胞，异形（囊）胞

英英释义

单词用法

同义词

反义词

例句

1.The filament possesses oblate cell for nutrition and heterocyst.

藻丝的营养细胞是扁平的，具异形胞。

2.The activity of the soluble protease of heterocyst was 4-5 times higher than that of the vegetative cell.

异形胞可溶部分的蛋白酶活比营养细胞可溶的蛋白酶活高4—5倍。

3.The result showed that one mutant was unable to differentiate heterocyst, three formed heterocysts but still could not maintain normal growth, four growed slowly with heterocyst differentiation.

结果显示，有一个突变株不能分化异形胞；三个突变株可以形成异形胞，但在缺氮的条件下仍不能维持生长；

4.The result showed that one mutant was unable to differentiate heterocyst, three formed heterocysts but still could not maintain normal growth, four growed slowly with heterocyst differentiation.

结果显示，有一个突变株不能分化异形胞；三个突变株可以形成异形胞，但在缺氮的条件下仍不能维持生长；

5.Researchers are studying how heterocysts 异质胞 contribute to the nitrogen cycle in aquatic ecosystems.

研究人员正在研究heterocysts 异质胞如何促进水生生态系统中的氮循环。

6.The presence of heterocysts 异质胞 in the filamentous cyanobacteria indicates their ability to thrive in nutrient-poor environments.

丝状蓝藻中heterocysts 异质胞的存在表明它们能够在营养贫乏的环境中生存。

7.In certain cyanobacteria, a specialized cell called a heterocyst 异质胞 is formed to fix nitrogen.

在某些蓝藻中，形成了一种特殊的细胞，称为heterocyst 异质胞，用于固氮。

8.In laboratory studies, scientists observed that heterocysts 异质胞 can survive extreme conditions.

在实验室研究中，科学家观察到heterocysts 异质胞能够在极端条件下生存。

9.The formation of heterocysts 异质胞 is triggered by low nitrogen availability in the environment.

当环境中氮含量低时，会触发heterocysts 异质胞的形成。

作文

In the fascinating world of biology, the study of microorganisms reveals many intriguing adaptations that allow life to thrive in diverse environments. One such adaptation can be found in certain types of cyanobacteria, which are known for their ability to perform photosynthesis. Among these remarkable organisms, the term heterocyst refers to a specialized cell that plays a crucial role in nitrogen fixation. Nitrogen is an essential nutrient for all living organisms, yet it is often limited in aquatic environments. The evolution of heterocysts provides a solution to this challenge, allowing cyanobacteria to convert atmospheric nitrogen into a form that can be utilized by plants and other organisms.The structure of a heterocyst is quite unique. Unlike regular cells, heterocysts have thickened cell walls that create an anaerobic environment, which is necessary for the nitrogen-fixing enzyme, nitrogenase, to function effectively. This adaptation is vital because nitrogenase is sensitive to oxygen and would be rendered inactive in the presence of it. By forming heterocysts, cyanobacteria can protect this enzyme, thereby ensuring that they can convert nitrogen gas (N2) into ammonia (NH3), a process that enriches the surrounding environment.The occurrence of heterocysts is not random; rather, it is a strategic response to nutrient availability. In environments where nitrogen is scarce, these organisms begin to differentiate some of their cells into heterocysts. This differentiation is a remarkable example of cellular specialization, where certain cells take on specific functions that benefit the entire organism and its ecosystem. The presence of heterocysts allows cyanobacteria to flourish in conditions that would otherwise be inhospitable, demonstrating their resilience and adaptability.Furthermore, the role of heterocysts extends beyond just nitrogen fixation. They also contribute to the overall health of aquatic ecosystems. As cyanobacteria with heterocysts fix nitrogen, they provide a vital nutrient source for other organisms, including plants and algae. This process supports the entire food web, highlighting the interconnectedness of life forms within these ecosystems. Additionally, the presence of heterocysts can influence the dynamics of microbial communities, as they attract other bacteria that may benefit from the nitrogen-rich environment created by cyanobacteria.In summary, heterocyst cells are a fascinating example of adaptation in the microbial world. Their ability to fix nitrogen not only benefits the cyanobacteria themselves but also has far-reaching implications for the ecosystems they inhabit. Understanding the function and significance of heterocysts enhances our appreciation for the complexity of life at the microscopic level. As we continue to explore the intricacies of biological systems, the study of heterocysts serves as a reminder of the remarkable innovations that nature has developed to sustain life in a variety of environments. By recognizing the importance of these specialized cells, we can better understand the delicate balance of ecosystems and the crucial roles played by even the smallest organisms.

在生物学的迷人世界中，微生物的研究揭示了许多令人着迷的适应性，使生命能够在多样化的环境中繁荣。其中一种适应性可以在某些类型的蓝藻中找到，这些蓝藻以其进行光合作用的能力而闻名。在这些非凡的生物中，术语异质细胞指的是一种专门的细胞，在氮固定中起着至关重要的作用。氮是所有生物所必需的营养素，但在水生环境中通常是有限的。异质细胞的进化为这一挑战提供了解决方案，使蓝藻能够将大气中的氮转化为植物和其他生物可以利用的形式。异质细胞的结构非常独特。与普通细胞不同，异质细胞具有加厚的细胞壁，形成厌氧环境，这对于氮固定酶——氮酶的有效功能是必要的。这种适应性至关重要，因为氮酶对氧气敏感，在存在氧气的情况下会失去活性。通过形成异质细胞，蓝藻可以保护这种酶，从而确保它们能够将氮气（N2）转化为氨（NH3），这一过程丰富了周围的环境。异质细胞的出现并非随机，而是一种对营养物质可用性的战略响应。在氮稀缺的环境中，这些生物开始将一些细胞分化为异质细胞。这种分化是细胞专业化的一个显著例子，某些细胞承担特定功能，惠及整个生物体及其生态系统。异质细胞的存在使蓝藻能够在原本不适宜的条件下繁荣，展示了它们的韧性和适应性。此外，异质细胞的作用不仅限于氮固定。它们还对水生生态系统的整体健康做出了贡献。当蓝藻与异质细胞固定氮时，它们为其他生物，包括植物和藻类，提供了重要的营养来源。这个过程支持了整个食物网，突显了这些生态系统中生命形式之间的相互联系。此外，异质细胞的存在可能会影响微生物群落的动态，因为它们吸引其他可能从蓝藻创造的富氮环境中受益的细菌。总之，异质细胞是一种微生物世界中适应性的迷人例子。它们固定氮的能力不仅使蓝藻自身受益，而且对它们栖息的生态系统产生了深远的影响。理解异质细胞的功能和重要性增强了我们对微观层面生命复杂性的欣赏。随着我们继续探索生物系统的复杂性，对异质细胞的研究提醒我们，自然为了在各种环境中维持生命而发展出的卓越创新。通过认识到这些专门细胞的重要性，我们可以更好地理解生态系统的微妙平衡以及即使是最小的生物体所发挥的关键作用。