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Related Concept Videos

Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

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Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
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Line Loss01:10

Line Loss

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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
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Reducing Line Loss01:18

Reducing Line Loss

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
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Major Losses in Pipes01:28

Major Losses in Pipes

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When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
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Minor Losses in Pipes01:25

Minor Losses in Pipes

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In pipe systems, minor losses refer to energy losses arising from components such as valves, bends, fittings, expansions, and other features that disrupt the steady flow of fluid. These disturbances cause energy dissipation through turbulence and resistance, which engineers quantify to manage system efficiency effectively.
Valves play a significant role in generating minor losses by obstructing or redirecting the fluid flow. When a valve is closed or partially closed, it restricts the flow...
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Energy Losses in Transformers01:21

Energy Losses in Transformers

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In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
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Longitudinal Evaluation of Mouse Hind Limb Bone Loss After Spinal Cord Injury using Novel, in vivo, Methodology
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Renal insufficiency and bone loss.

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  • 1Department of Medicine, University of Washington, Seattle, Washington, USA.

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Patients with chronic kidney disease (CKD) face high fracture risks due to complex bone disease. Recent discoveries in signaling pathways offer potential for novel CKD bone disease treatments.

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Area of Science:

  • Nephrology
  • Endocrinology
  • Bone Metabolism

Background:

  • Chronic kidney disease (CKD) patients exhibit a high incidence of fractures.
  • Established treatments for CKD-related bone disease are lacking.
  • Mineral metabolism in CKD is complicated by newly identified factors, including vascular calcifications linked to bone disease.

Purpose of the Study:

  • To review the complex physiology of renal osteodystrophy.
  • To highlight recent findings in signaling pathways affecting bone disease in CKD.
  • To discuss the challenges and potential future directions for treating bone disease in CKD patients.

Main Methods:

  • Review of current literature on CKD-related bone disease.
  • Analysis of signaling pathways (Wnt, activin) and hormones (FGF-23, klotho) in CKD.
  • Evaluation of clinical studies on hyperparathyroidism and phosphate management.

Main Results:

  • Wnt and activin signaling pathways are implicated early in renal disease, influencing bone physiology.
  • Increased FGF-23 levels affect phosphate secretion and have systemic effects.
  • Secreted klotho is a newly identified hormone with multi-systemic effects.
  • Current treatments for hyperparathyroidism and phosphate have limitations.

Conclusions:

  • Treating bone disease in CKD patients remains a significant clinical challenge.
  • Understanding the intricate physiological pathways is crucial for developing novel therapeutic strategies.
  • Further research into signaling pathways and hormonal regulation may unlock new treatment avenues for CKD-associated bone disease.