periostracum

简明释义

英[ˌperɪˈɒstrəkəm]美[ˌperiˈɑstrəkəm]

n. 角质层

复 数 p e r i o s t r a c a

英英释义

单词用法

同义词

反义词

例句

1.Hair furcation because the surface layer (or periostracum) of hair stem has been already damaged.

头发分叉是因为毛干的表层(或角质层)已经损坏。

2.When the hair periostracum starts breakage, internal at the time that fiber exposed, the hair would become dry.

当头发角质层开始破坏，内部纤维暴露的时候，头发就会变得干燥。

3.Treating the sample of periostracum cicada with suspension technique, calcium, manganese and zinc were successfully determined by FAAS.

以悬浮液技术处理样品，用火焰原子吸收光谱法成功地测定了蝉蜕中的钙、锰、锌。

4.Treating the sample of periostracum cicada with suspension technique, calcium, manganese and zinc were successfully determined by FAAS.

以悬浮液技术处理样品，用火焰原子吸收光谱法成功地测定了蝉蜕中的钙、锰、锌。

5.Researchers found that the periostracum can influence the growth rate of bivalves.

研究人员发现，外壳层可以影响双壳类动物的生长速度。

6.The periostracum helps prevent the penetration of harmful substances into the shell.

这个外壳层有助于防止有害物质渗入壳内。

7.In marine biology, understanding the periostracum is crucial for studying shell formation.

在海洋生物学中，理解外壳层对于研究壳的形成至关重要。

8.The color of the periostracum can vary significantly among different species.

不同物种之间，外壳层的颜色可能会有显著差异。

9.The periostracum acts as a protective layer for the mollusk's shell.

这个外壳层作为软体动物壳的保护层。

作文

The study of marine biology introduces us to a variety of fascinating structures and functions found in the ocean's inhabitants. One such structure is the periostracum, which plays a crucial role in the lives of many mollusks, particularly bivalves and gastropods. The periostracum is a thin, organic layer that covers the outer shell of these creatures, providing both protection and support. Understanding the significance of the periostracum can enhance our appreciation for the complexity of marine life and its adaptations.At first glance, one might overlook the periostracum, as it is often thin and not as visually striking as the hard shell beneath it. However, this layer is vital for the mollusk's survival. The periostracum serves as a barrier against environmental factors, such as harmful microorganisms and pollutants. It also helps to prevent the shell from becoming overly calcified, which can occur in certain conditions. This protective function is essential, as the shell itself is not only a defense mechanism against predators but also a critical component of the mollusk's overall physiology.Moreover, the periostracum is involved in the growth process of the shell. As mollusks grow, they secrete new layers of calcium carbonate, and the periostracum aids in the deposition of these materials. This process ensures that the shell remains strong and capable of withstanding the pressures of the underwater environment. In essence, the periostracum acts as a facilitator, allowing the mollusk to thrive in various habitats, from rocky shores to sandy bottoms.Interestingly, the composition of the periostracum can vary among different species of mollusks. In some cases, it may contain proteins and polysaccharides that contribute to its durability and flexibility. For instance, the periostracum of certain bivalves may be enriched with specific proteins that enhance its resistance to abrasion and damage. This variation highlights the evolutionary adaptations that mollusks have developed in response to their unique environments.In addition to its protective and structural roles, the periostracum can also play a part in the mollusk's coloration. Some species exhibit vibrant colors or patterns on their shells, which are often influenced by the periostracum. These colors can serve various purposes, including camouflage from predators or signaling to potential mates. Thus, the periostracum is not merely a passive covering; it actively contributes to the mollusk's interactions with its environment and other organisms.In conclusion, the periostracum is a remarkable feature of mollusks that warrants further exploration and understanding. Its multifaceted roles in protection, growth, and even aesthetics highlight the intricate relationships between organisms and their environments. By studying the periostracum, we gain insights into the evolutionary strategies that have enabled these creatures to survive and flourish in diverse marine ecosystems. As we continue to explore the wonders of marine biology, let us not forget the importance of seemingly simple structures like the periostracum, which play a pivotal role in the complex tapestry of life beneath the waves.

海洋生物学的研究使我们接触到海洋生物中各种迷人的结构和功能。其中一个结构是外壳膜，它在许多软体动物的生活中发挥着至关重要的作用，特别是双壳类和腹足类。外壳膜是覆盖这些生物外壳的薄而有机的层，为其提供保护和支持。理解外壳膜的重要性可以增强我们对海洋生物复杂性及其适应能力的欣赏。乍一看，人们可能会忽视外壳膜，因为它通常很薄，不像下面坚硬的外壳那样引人注目。然而，这一层对软体动物的生存至关重要。外壳膜作为环境因素的屏障，抵御有害微生物和污染物的侵袭。它还帮助防止外壳过度钙化，这在某些条件下可能发生。这种保护功能至关重要，因为外壳不仅是抵御捕食者的防御机制，也是软体动物整体生理结构的关键组成部分。此外，外壳膜还参与外壳的生长过程。当软体动物生长时，它们分泌新的碳酸钙层，而外壳膜则有助于这些材料的沉积。这个过程确保了外壳保持坚固，能够承受水下环境的压力。从本质上讲，外壳膜充当促进者，使软体动物能够在从岩石海岸到沙底等各种栖息地中茁壮成长。有趣的是，外壳膜的成分在不同种类的软体动物之间可能有所不同。在某些情况下，它可能含有蛋白质和多糖，从而增加其耐用性和柔韧性。例如，某些双壳类的外壳膜可能富含特定的蛋白质，增强其抗磨损和损伤的能力。这种变化突显了软体动物在应对独特环境时所发展出的进化适应性。除了保护和结构角色外，外壳膜还可能在软体动物的着色中发挥作用。一些物种在其外壳上表现出鲜艳的颜色或图案，这些通常受到外壳膜的影响。这些颜色可以服务于多种目的，包括躲避捕食者的伪装或向潜在伴侣发出信号。因此，外壳膜不仅仅是被动的覆盖物；它主动影响软体动物与环境及其他生物的互动。总之，外壳膜是软体动物的一个显著特征，值得进一步探索和理解。它在保护、成长甚至美学方面的多重角色突显了生物与其环境之间复杂的关系。通过研究外壳膜，我们可以深入了解这些生物得以在多样化海洋生态系统中生存和繁荣的进化策略。随着我们继续探索海洋生物学的奇迹，让我们不要忘记看似简单的结构如外壳膜的重要性，这些结构在波涛之下的生命复杂织锦中发挥着关键作用。