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相关概念视频

Osmoregulation in Fishes02:32

Osmoregulation in Fishes

When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
Aquaporins01:25

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...

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相关实验视频

Updated: Jul 11, 2026

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
14:38

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential

Published on: April 20, 2012

南极鱼类中的聚体化.

G H Dobbs, Y Lin, A L DeVries

    Science (New York, N.Y.)
    |August 30, 1974
    PubMed
    概括

    南极骨鱼在没有球膜过的情况下形成尿液,这一过程称为球膜化. 这种脏适应可能会防止重要的生物抗蛋白质的损失.

    科学领域:

    • 生理学 生理学 生理学
    • 动物学 动物学
    • 海洋生物学 海洋生物学

    背景情况:

    • 南极骨鱼生活在极端寒冷的环境中.
    • 功能对于脊椎动物的度调节和废物分泌至关重要.

    研究的目的:

    • 为了研究南极骨鱼尿液形成的机制.
    • 为了确定这些鱼的脏中是否发生膜过.

    主要方法:

    • 连续部份的光显微镜.
    • 在尾静脉注射后测量碳-14标记的胰岛素分泌量.

    主要成果:

    • 直接观察证实,鱼的脏中没有球粒.
    • 排泄的低度的胰岛素表明缺乏淋巴膜过.

    结论:

    • 南极的骨鱼具有聚聚质脏.
    • 凝聚体可能是一种适应,以防止丧失重要的抗糖蛋白.

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