相关概念视频
00:47Osmosis
Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.Diffusion Versus OsmosisBoth diffusion and osmosis are types of passive transport—cellular transport that does not require...
02:32Osmoregulation 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?
02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
02:03Xylem and Transpiration-driven Transport of Resources
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
01:25Aquaporins
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.
01:30Osmosis
Osmosis is the movement of free water molecules through a semipermeable membrane. The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of free water...
Water, like other substances, moves from a high concentration of free water...
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相关实验视频
Updated: Jul 15, 2026
08:23
Seawater Sampling and Collection
Published on: June 17, 2009
海洋鱼蛋的水分是通过水介导的.
Mercedes Fabra1, Demetrio Raldúa, Deborah M Power
1Center of Aquaculture-Institut de Recerca i Tecnologia Agroalimentaries, Tarragona, Spain, and Reference Center in Aquaculture, Barcelona, Spain.
Science (New York, N.Y.)
|February 1, 2005
概括
海洋鱼蛋的浮力对于生存至关重要. 研究人员确定了一种特定的水素素,SaAQP1o,对激素诱导的卵细胞水合和远体动物的卵浮力至关重要.
科学领域:
- 海洋生物学 海洋生物学
- 分子生物学分子生物学
- 生理学 生理学 生理学
背景情况:
- 海洋鱼蛋的积极浮力对于生存和散播至关重要.
- 卵细胞的水分是使这种浮力成为可能的关键因素.
研究的目的:
- 为了识别和表征参与鱼卵细胞水合的水素素.
- 阐明这些水族素在海洋鱼类繁殖中的作用.
主要方法:
- 隔离和特征的水素SaAQP1o.o. 的隔离和特征.
- 对鱼卵巢SaAQP1o表达的分析.
- 研究激素诱导的卵细胞水化机制.
主要成果:
- SaAQP1o是一种独特的水素子家族成员,主要表达在远端卵巢中.
- 鱼卵细胞水化是一种涉及蛋白质水解的规范过程.
- 将SaAQP1o转移到等离子体膜对于水化至关重要.
结论:
- SaAQP1o在鱼卵细胞水分中发挥着专门的生理作用.
- 这种水素素是海洋鱼卵的浮力和生存不可或缺的一部分.
