tapetum

简明释义

英[təˈpiːtəm]美[təˈpitəm]

n. [脊椎] 毯；[昆] 反光组织；[解剖] 反光色素层；膜状层（尤指照膜）

复 数 t a p e t a

英英释义

单词用法

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反义词

例句

1.Be pregnant 3-5 in month, the nasciturus' tapetum development needs to depend on parent population to supplies ample thyroxine.

怀孕3 - 5个月时，胎儿的脑发育需要依赖母体供给充足的甲状腺素。

2.The specialist suggests that the pregnant woman eats 1-2 fishes at least within a week to absorb ripe DHA and satisfies the nasciturus' tapetum development demand.

专家建议，孕妇在一周之内至少吃1-2次鱼，以吸收足够的DHA，满足胎儿的脑发育需求。

3.The ubisch bodies which appeared on the inner tangential wall of the tapetum at the time of microspore wall formation are partially remain on the surface of matured pollen grain.

小孢子壁形成时开始在绒毡层内切线壁出现的球状体到花粉粒成熟时仍有一部分附着于花粉粒表面。

4.The main pathways of causing empty anther sacs are obvious enlargement and liquidization of tapetum cells from tetrad to slope nucleus early period;

空囊产生的主要途径：①四分体至单核早期绒毡层细胞体积发生明显的增大、液化；

5.The tapetum degenerates too early.

绒毡层过早退化；

6.The mature embryo sac is surrounded by en lothelium tapetum. It is composed or an egg apparatus, one central cell with secondary nucleus, and 1—6 antipodal cells.

成熟胚囊被珠被绒毡县包围，由卵器、具次生核的中央细胞以及数目为1至6个反足细胞组成。

7.Tapetum (pl. tapeta) A food-rich layer surrounding the spore mother cells in the anthers of vascular plants.

绒毡层：维管植物花粉囊内包围孢子母细胞的富含营养物质的一层结构。

8.The tapetum belongs to the periplasmodial type.

绒毡层属于周原质团型。

9.The tapetum plays a crucial role in enhancing vision by reflecting light back through the retina.

通过将光线反射回视网膜，tapetum在增强视觉方面起着至关重要的作用。

10.Scientists study the structure of the tapetum to understand how certain animals see in low light.

科学家研究tapetum的结构，以了解某些动物如何在低光照条件下视物。

11.The eyes of many nocturnal animals have a reflective layer called the tapetum.

许多夜行性动物的眼睛有一层反射层，称为tapetum。

12.The tapetum is responsible for the glowing effect seen in cat eyes at night.

在夜间看到猫眼发光的效果是由于tapetum的作用。

13.Dogs also have a tapetum, which helps them see better in dim light compared to humans.

狗也有tapetum，这帮助它们在昏暗的光线下比人类看得更清楚。

作文

The phenomenon of night vision in many animals has always fascinated scientists and nature enthusiasts alike. One of the key components that contribute to this remarkable ability is a layer of tissue known as the tapetum. The tapetum is a reflective layer located behind the retina in the eyes of certain vertebrates, including many mammals and some reptiles. Its primary function is to enhance vision in low-light conditions by reflecting light that passes through the retina back into the eye, giving photoreceptor cells another chance to absorb it. This adaptation is particularly beneficial for nocturnal animals, such as cats and deer, which rely on their acute sense of sight to navigate and hunt in dim environments.The structure of the tapetum varies among species. In cats, for example, the tapetum is made up of crystals of guanine, which provide a bright, shimmering effect when light strikes them. This is why cat eyes appear to glow in the dark; the tapetum effectively amplifies available light, making it easier for these animals to see in the dark. In contrast, other animals, like dogs, have a different composition of their tapetum, which may not reflect light as strongly but still aids in low-light vision.The evolutionary significance of the tapetum cannot be overstated. It represents a fascinating example of how animals adapt to their environments. For creatures that are active at dawn or dusk, known as crepuscular animals, the tapetum provides a competitive advantage, allowing them to spot prey or avoid predators with greater ease. This adaptation highlights the intricate relationship between an organism and its habitat, showcasing the remarkable ways in which life evolves to meet the challenges of survival.However, the tapetum is not just limited to enhancing vision; it also plays a role in the broader context of animal behavior and ecology. For instance, animals with a well-developed tapetum often exhibit specific hunting or foraging behaviors tailored to low-light conditions. This can influence their social interactions, mating rituals, and even territorial disputes, as visibility can significantly impact how these behaviors unfold.In addition to its biological importance, the tapetum has intrigued researchers in fields such as biomimicry and optics. Scientists study the tapetum to develop new technologies that mimic its reflective properties, potentially leading to advancements in night vision devices and other optical applications. By understanding how the tapetum functions, researchers can create more effective tools for both scientific exploration and everyday use.In conclusion, the tapetum is a remarkable adaptation that exemplifies the ingenuity of evolution. Its ability to enhance vision in low-light conditions has profound implications for the survival of various species. As we continue to explore the natural world, the study of structures like the tapetum not only enriches our understanding of biology but also inspires innovation in technology. The next time you see an animal with shining eyes in the dark, remember the incredible tapetum working behind the scenes to enable that extraordinary vision.

许多动物在夜间视觉现象一直吸引着科学家和自然爱好者的兴趣。其中一个关键组成部分是被称为tapetum的组织层。tapetum是位于某些脊椎动物眼睛视网膜后方的一层反射组织，包括许多哺乳动物和一些爬行动物。它的主要功能是在低光条件下增强视觉，通过将穿过视网膜的光线反射回眼睛，给予光感受器细胞另一次吸收光线的机会。这种适应性对于依赖于敏锐视觉在昏暗环境中导航和捕猎的夜行性动物（如猫和鹿）尤其有益。tapetum的结构在不同物种之间有所不同。例如，在猫中，tapetum由鸟嘌呤晶体组成，当光线照射到它们时，会产生明亮而闪烁的效果。这就是为什么猫的眼睛在黑暗中看起来会发光；tapetum有效地放大了可用光，使这些动物更容易在黑暗中看见。相比之下，其他动物，如狗，它们的tapetum组成可能没有那么强烈的光反射，但仍然能帮助它们在低光条件下视觉。tapetum的进化意义不容小觑。它代表了一种动物如何适应其环境的迷人例子。对于那些在黎明或黄昏活跃的动物（称为黄昏性动物），tapetum提供了竞争优势，使它们更容易发现猎物或避开捕食者。这种适应性突显了生物与栖息地之间错综复杂的关系，展示了生命为了应对生存挑战而演化的非凡方式。然而，tapetum不仅限于增强视觉；它还在动物行为和生态的更广泛背景中发挥作用。例如，具有良好发达tapetum的动物通常表现出特定的狩猎或觅食行为，以适应低光条件。这可以影响它们的社会互动、交配仪式，甚至领土争端，因为能见度会显著影响这些行为的展开。除了生物学的重要性，tapetum还引起了生物模仿和光学等领域研究人员的关注。科学家们研究tapetum以开发模仿其反射特性的技术，可能导致夜视设备和其他光学应用的进步。通过理解tapetum的功能，研究人员可以创造出更有效的工具，既用于科学探索，也用于日常使用。总之，tapetum是一个非凡的适应性，体现了进化的聪明才智。它在低光条件下增强视觉的能力对各种物种的生存具有深远的影响。当我们继续探索自然世界时，像tapetum这样的结构研究不仅丰富了我们对生物学的理解，还激励了技术创新。下次你看到在黑暗中闪烁的动物眼睛时，请记住这个令人难以置信的tapetum在幕后为那种非凡的视觉工作。