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Disorder of Water Balance01:29

Disorder of Water Balance

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Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
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Regulation of Water Intake01:25

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Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
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Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three terms—hypotonic, isotonic, and hypertonic—are used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic solution, such as tap water, the extracellular fluid has a lower concentration of solutes than the fluid inside...
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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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The formation of dilute urine is a critical renal adaptation that maintains fluid balance, particularly during periods of high fluid intake. This process primarily involves the juxtamedullary nephrons. By adjusting the permeability of water and ions in response to physiological conditions, the kidneys can either conserve or excrete water, resulting in concentrated or dilute urine.
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Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.
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Hydration Induces Dehydration: Creating Negative Swelling Gel by a Paradox.

Zhi Zhao1, Xiaotong Zheng1, Yurong Li1

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Researchers developed novel negative swelling hydrogels that dehydrate when hydrated. These advanced materials offer improved mechanical properties and self-repair capabilities underwater, overcoming limitations of traditional hydrogels.

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hydration‐induced‐dehydrationhydrogelinterpenetrating polymer networknegative swellingunique underwater behaviors

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Hydrogels typically exhibit positive swelling in water, which often compromises their mechanical strength and stability.
  • Achieving negative swelling in hydrogels is highly desirable for overcoming these limitations but remains a significant scientific challenge.

Purpose of the Study:

  • To synthesize and characterize the first real negative swelling hydrogels.
  • To investigate the unique properties and potential applications arising from hydration-induced dehydration.

Main Methods:

  • Design of a unique molecular architecture featuring an interpenetrating transformable-rigid polymer network.
  • Induction of self-assembly and subsequent collapse upon hydration, leading to dehydration.

Main Results:

  • Successful preparation of hydrogels exhibiting true negative swelling, losing up to 35% of their weight underwater.
  • Demonstration of water-strengthened mechanical properties, enhanced structural responsiveness, and underwater self-repair capabilities.
  • Observation of resistance to deformation and a novel swelling turn-off effect.

Conclusions:

  • The developed negative swelling hydrogels represent a breakthrough in material science, offering a solution to the inherent instability of traditional hydrogels.
  • The paradoxical hydration-induced-dehydration mechanism unlocks revolutionary properties for advanced material development and diverse underwater applications.