instar

简明释义

英[ˈɪnstɑː(r)]美[ˈɪnstɑr]

n. [昆]龄，龄期（幼虫两次蜕皮间的虫期）；中间形态

vt. 将……镶上星星或星状物

复 数 i n s t a r s

第 三 人 称 单 数 i n s t a r s

现 在 分 词 i n s t a r r i n g

过 去 式 i n s t a r r e d

过 去 分 词 i n s t a r r e d

英英释义

单词用法

同义词

反义词

例句

1.The wing buds were found on the 4 th instar dorsal view.

四龄若虫由背面观具明显翅芽；

2.The content of protein in blood has a dynamic change from first day of fifth instar to first day of pupation on cassava-silkworm(the Nanning No. 1 race).

本文报道木薯蚕南一品种，从五龄起蚕至化蛹第一天血液蛋白质含量的动态变化。

3.The results showed that the absorption of nitrogen decreased hile that of sugar increased with larval development from the third to fifth instar.

结果表明：幼虫对饲料中氮的吸收能力随虫龄增加而下降，对糖的吸收能力则随之而增强；

4.The results showed that; (1) MH comes into antagonism with AJH, but JH doesn't antagonize AJH in the 2nd, 3rd and 4th instar larvae treated by the hormones.

结果表明：(1)2龄、3龄和4龄蚕应用外源激素处理，AJH与MH之间存在明显的拮抗关系；而ajh与JH间未表现出拮抗关系。

5.In early stage of 4th instar, thick basement membrane and irregularly round nucleus of the prothoracic gland cell were observed.

在四龄龄初细胞基底膜很致密，细胞核不规则形。

6.Law between digestion and growth of Antheraea yamamai is obtained through determining average weight increase at each instar, and calculating growth multiple of weight every instar.

并且对各龄蚕体重的平均增长量进行了测试，计算了各龄期蚕体的增重倍数，揭示了天蚕随着龄期的增长消化和体重的变化规律。

7.Various corn borer microsporozoites were used to feed and soak Dendrolimus honi larvae at the instar of 1,2,4 and 7 for infecting them.

用不同浓度的玉米螟微孢子虫悬浮液，饲喂及浸泡感染1、2、4、7龄云南松毛虫幼虫。

8.The parasitized DBM larvae had prolonged their 4th instar duration obviously, and the later the larva had been parasitized, the longer this extended duration became.

小菜蛾幼虫被寄生后，其4龄发育历期较未被寄生的显著长，且寄生时龄期越大4龄历期延长越多。

9.The caterpillar has reached its third instar (期) and is ready to molt.

这只毛毛虫已经达到了它的第三个instar（期），准备蜕皮。

10.The life cycle of this species includes five instars (期) before pupation.

这个物种的生命周期包括五个instar（期）后才能化蛹。

11.Researchers observed the behavior of the larvae in their final instar (期).

研究人员观察了幼虫在最后一个instar（期）中的行为。

12.Each instar (期) presents unique challenges for the growing insect.

每个instar（期）给正在生长的昆虫带来了独特的挑战。

13.During the second instar (期), the insect shows significant growth.

在第二个instar（期）期间，昆虫显示出显著的生长。

作文

The process of metamorphosis in insects is a fascinating subject that has intrigued scientists and nature enthusiasts alike. One of the key stages in this transformation is known as instar, which refers to the developmental stage of an insect between molts. During its life cycle, an insect will go through several instars, each marked by distinct physical characteristics and behaviors. This essay will explore the significance of instar stages in the life cycle of insects, their impact on growth and survival, and the broader implications for ecosystems.Insects undergo metamorphosis in two primary forms: complete and incomplete. Incomplete metamorphosis consists of three stages: egg, nymph, and adult. In this process, the nymph undergoes several instars, gradually resembling the adult form. Each instar allows the insect to grow, feed, and develop its features before it sheds its exoskeleton. The shedding of the exoskeleton, known as molting, is a critical event that enables the insect to increase in size and adapt to its environment.The number of instars an insect goes through can vary significantly among species. For example, grasshoppers typically have five instars, while cockroaches may go through six or more. Each instar provides a unique opportunity for the insect to learn and adapt to its surroundings. During these stages, they often change their feeding habits, habitat preferences, and even social interactions. This adaptability is crucial for their survival, especially in dynamic ecosystems where food sources and predators may change rapidly.Additionally, the concept of instar extends beyond just physical growth. It also encompasses behavioral changes that occur as insects mature. For instance, younger instars may exhibit different foraging strategies compared to older ones. This shift in behavior can influence the overall dynamics of the ecosystem, as insects play vital roles in pollination, decomposition, and serving as prey for other animals.Understanding instar stages can also have practical applications in agriculture and pest management. By recognizing the different instars of pest species, farmers can implement targeted strategies to control populations effectively. For example, certain pesticides are more effective during specific instar stages, allowing for more efficient and environmentally friendly pest management practices.Moreover, studying instar stages contributes to our understanding of evolutionary biology. The variations in the number and duration of instars among different species provide insights into how insects have adapted to their environments over time. Researchers can analyze these differences to understand the evolutionary pressures that shape insect development and behavior.In conclusion, the term instar is fundamental to understanding the life cycle of insects and their ecological roles. Each instar represents a critical phase of development that influences not only the insect's growth but also its interactions with the environment. By studying these stages, we can gain valuable insights into insect biology, improve agricultural practices, and enhance our appreciation for the intricate web of life that exists within ecosystems. The journey from one instar to another is not just a biological process; it is a testament to the resilience and adaptability of life on Earth.

昆虫的变态过程是一个迷人的主题，吸引了科学家和自然爱好者的关注。在这一转变中，一个关键阶段被称为instar，指的是昆虫在蜕皮之间的发育阶段。在其生命周期中，昆虫会经历多个instar，每个阶段都有独特的身体特征和行为。本文将探讨instar阶段在昆虫生命周期中的重要性，它们对生长和生存的影响，以及对生态系统的更广泛影响。昆虫的变态分为两种主要形式：完全变态和不完全变态。不完全变态包括三个阶段：卵、若虫和成虫。在这个过程中，若虫经历多个instar，逐渐接近成虫的形态。每个instar都使昆虫能够生长、进食并发展其特征，然后再蜕去外骨骼。蜕皮是一个关键事件，使昆虫能够增加体型并适应环境。昆虫经历的instar数量在不同物种之间可能有显著差异。例如，蚱蜢通常有五个instar，而蟑螂可能经历六个或更多。每个instar为昆虫提供了独特的学习和适应周围环境的机会。在这些阶段中，它们的取食习惯、栖息地偏好，甚至社会互动往往会发生变化。这种适应能力对它们的生存至关重要，尤其是在食物来源和捕食者可能迅速变化的动态生态系统中。此外，instar的概念不仅限于身体生长。它还包括昆虫成熟时发生的行为变化。例如，年轻的instar可能表现出与年长个体不同的觅食策略。这种行为的转变可以影响生态系统的整体动态，因为昆虫在授粉、分解和作为其他动物的猎物方面发挥着重要作用。理解instar阶段在农业和害虫管理中也具有实际应用。通过识别害虫物种的不同instar，农民可以实施针对性的策略，有效控制种群。例如，某些杀虫剂在特定的instar阶段效果更佳，从而实现更高效和环保的害虫管理实践。此外，研究instar阶段有助于我们理解进化生物学。不同物种之间instar数量和持续时间的变化提供了关于昆虫如何随时间适应其环境的见解。研究人员可以分析这些差异，以了解塑造昆虫发育和行为的进化压力。总之，术语instar对于理解昆虫的生命周期及其生态角色至关重要。每个instar代表了一个关键的发展阶段，影响着昆虫的生长以及与环境的相互作用。通过研究这些阶段，我们可以获得有关昆虫生物学的宝贵见解，改善农业实践，并增强我们对生态系统中存在的复杂生命网络的欣赏。从一个instar到另一个instar的旅程不仅仅是一个生物过程；它是对地球上生命韧性和适应性的证明。