metacercaria

简明释义

英[ˌmetəsɜːˈkærɪə]美[ˈkeərɪr]

后囊蚴

[无脊椎] 后尾蚴

英英释义

单词用法

同义词

反义词

例句

1.It suggests that the tegument of metacercaria is the main absorptive site of nutrients.

结果提示皮层是后尾蚴吸收营养物质的主要部位。

2.To study the infection of encysted metacercaria on fresh water fish in Nanshan District of Shenzhen and provide references for disease control units.

目的了解深圳市南山区食用淡水鱼华支睾吸虫囊蚴感染情况，为疾病控制部门采取预防措施提供参考资料。

3.CrABS were collected from 24 villages in 12 towns and P. westermani metacercaria were detected.

方法选取西塔镇等12个乡镇24个村，捕捉蟹类并检查并殖吸虫囊蚴。

4.Result Eating raw crab rate was 37.66% according to the investigation table, metacercaria infection rate was 7,93% in dissected crabs.

结果问卷调查发现村民生吃蟹率为37．66%；解剖的溪蟹中，囊蚴感染率为7．93%；

5.Meanwhile by IFA with frozen sections of metacercaria revealed 2different patterns of immunofluorescence reaction.

用囊蚴冷冻切片作IFA，出现两种不同的免疫荧光反应类型。

6.Encysted metacercaria are susceptive to heat and can be killed in boiling water immediately.

此外，蟹体囊蚴对热力敏感，在沸水很快即被杀死。

7.To study the infection of encysted metacercaria on fresh water fish in Nanshan District of Shenzhen and provide references for disease control units.

目的了解深圳市南山区食用淡水鱼华支睾吸虫囊蚴感染情况，为疾病控制部门采取预防措施提供参考资料。

8.The ultrastructure of metacercaria of Paragonirtus westermani was observed with scanning electron microscopy.

应用扫描电镜观察卫氏并殖吸虫后尾蚴的超微结构。

9.In freshwater lakes, fish often harbor metacercariae that can lead to infections in humans when consumed raw.

在淡水湖中，鱼类常常携带metacercariae（囊蚴），当生吃时可能导致人类感染。

10.The transmission of diseases like schistosomiasis is linked to the presence of metacercaria in contaminated water sources.

像血吸虫病这样的疾病传播与污染水源中metacercaria（囊蚴）的存在有关。

11.Research has shown that certain environmental factors can influence the prevalence of metacercaria in aquatic ecosystems.

研究表明，某些环境因素可以影响水生生态系统中metacercaria（囊蚴）的流行程度。

12.Veterinarians are concerned about the impact of metacercaria on livestock health, especially in regions with high parasite loads.

兽医担心metacercaria（囊蚴）对牲畜健康的影响，特别是在寄生虫负荷较高的地区。

13.The life cycle of the trematode includes a stage where the larva develops into a metacercaria, which is the encysted form that can infect a host.

绦虫的生命周期包括一个阶段，在这个阶段，幼虫发育成metacercaria（囊蚴），这是可以感染宿主的囊泡形式。

作文

The study of parasitology is a fascinating field that reveals the complex relationships between hosts and parasites. One of the critical stages in the life cycle of certain parasitic flatworms, particularly trematodes, is known as metacercaria. This term refers to the encysted larval stage that occurs after the cercarial stage and before the adult worm stage. Understanding metacercaria is essential for grasping how these parasites infect their hosts and perpetuate their life cycles.In essence, metacercaria represents a transitional phase where the larvae are encased within a protective cyst, often found in the tissues of intermediate hosts such as fish or amphibians. This stage is crucial for the survival of the parasite, as it allows the larvae to remain dormant until they are ingested by a definitive host, usually a mammal, where they can mature into adults and reproduce. The ability of metacercaria to survive in various environmental conditions showcases the adaptability of these parasites.The lifecycle of trematodes typically begins when eggs are excreted from the definitive host into the environment, often through feces. These eggs hatch into miracidia, which must find and penetrate a suitable intermediate host. Once inside, they develop into sporocysts and then into rediae, eventually leading to the formation of cercariae. These free-swimming larvae exit the intermediate host and seek out another host to infect. If they succeed, they can encyst and become metacercaria. This process highlights the intricate nature of parasitic development and the importance of understanding each stage for effective control measures.In terms of human health, some species of trematodes that utilize metacercaria as part of their life cycle can lead to significant diseases. For example, the liver fluke, Fasciola hepatica, has a life cycle that includes the metacercaria stage, which can infect livestock and, subsequently, humans who consume contaminated water plants. This parasitic infection can result in severe liver damage and other health issues, emphasizing the need for public health awareness and preventive strategies.Moreover, the ecological implications of metacercaria are noteworthy. They play a role in the dynamics of aquatic ecosystems, influencing the population of intermediate hosts and affecting predator-prey relationships. The presence of these parasitic larvae can impact fish populations, which in turn affects the entire food web. As researchers continue to explore the role of metacercaria in ecosystems, they uncover more about the balance of nature and the interconnectedness of life forms.In conclusion, the term metacercaria is not merely a scientific label but a window into the complex world of parasitology. Understanding this stage of the trematode life cycle enhances our knowledge of how these organisms interact with their environments and hosts. It also underscores the importance of addressing parasitic infections that can have profound effects on both human health and ecological stability. By studying metacercaria, we gain insights that can lead to better prevention, treatment, and management of parasitic diseases, ultimately contributing to healthier ecosystems and populations.

寄生虫学的研究是一个引人入胜的领域，揭示了宿主与寄生虫之间复杂的关系。在某些寄生性扁虫，特别是吸虫的一生中，一个关键阶段被称为metacercaria。这个术语指的是在尾蚴阶段之后和成虫阶段之前的囊泡幼虫阶段。理解metacercaria对于掌握这些寄生虫如何感染宿主并延续其生命周期至关重要。本质上，metacercaria代表了一个过渡阶段，在这个阶段，幼虫被包裹在一个保护性的囊泡内，通常存在于鱼类或两栖动物等中间宿主的组织中。这个阶段对寄生虫的生存至关重要，因为它允许幼虫保持休眠状态，直到被最终宿主（通常是哺乳动物）摄入，在那里它们可以成熟为成虫并繁殖。metacercaria能够在各种环境条件下生存的能力展示了这些寄生虫的适应性。吸虫的生命周期通常始于卵子通过最终宿主的排泄物释放到环境中，通常是通过粪便。这些卵子孵化成毛蚴，必须找到并穿透合适的中间宿主。一旦进入，它们发展成孢囊，然后形成红色幼虫，最终导致尾蚴的形成。这些自由游动的幼虫从中间宿主中排出，寻找另一个宿主进行感染。如果它们成功，它们可以囊泡化并成为metacercaria。这一过程突显了寄生虫发育的复杂性以及理解每个阶段对于有效控制措施的重要性。就人类健康而言，一些利用metacercaria作为其生命周期一部分的吸虫种类可能导致重大疾病。例如，肝吸虫Fasciola hepatica的生命周期包括metacercaria阶段，这可能感染家畜，并随后感染食用受污染水生植物的人类。这种寄生虫感染可能导致严重的肝损伤和其他健康问题，强调了公共健康意识和预防策略的必要性。此外，metacercaria的生态意义也值得注意。它们在水生生态系统的动态中发挥作用，影响中间宿主的种群并影响捕食者-猎物关系。这些寄生幼虫的存在可能影响鱼类种群，进而影响整个食物网。随着研究人员继续探索metacercaria在生态系统中的角色，他们揭示了自然平衡和生命形式相互联系的更多信息。总之，术语metacercaria不仅仅是一个科学标签，而是观察寄生虫学复杂世界的窗口。理解这一吸虫生命周期阶段增强了我们对这些生物如何与其环境和宿主相互作用的知识。它还强调了应对寄生虫感染的重要性，这些感染可能对人类健康和生态稳定产生深远影响。通过研究metacercaria，我们获得了可以导致更好预防、治疗和管理寄生虫疾病的见解，最终有助于更健康的生态系统和人群。