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Related Concept Videos

Base Quantities and Derived Quantities01:14

Base Quantities and Derived Quantities

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In any system of units, the units for some physical quantities must be specified through a measurement process. These measurements are the base quantities of the system, and their units are the base units of the system. The algebraic combinations of the base values can then be used to express all other physical quantities. Each of these physical quantities is then referred to as a derived quantity, with each unit being referred to as a derived unit.
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Decreasing Function01:27

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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
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If the rotational definitions are compared with the definitions of linear kinematic variables from motion along a straight line and motion in two and three dimensions, we can observe a mapping of the linear variables to the rotational ones.
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Related Experiment Video

Updated: Jan 27, 2026

A Novel Mammary Fat Pad Transplantation Technique to Visualize the Vessel Generation of Vascular Endothelial Stem Cells
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Quality and Quantity-Cultured Murine Endothelial Progenitor Cells Increase Vascularization and Decrease Fibrosis in

Maxim Geeroms1, Moustapha Hamdi1, Rie Hirano1

  • 1From the Plastic and Reconstructive Surgery Department, Juntendo University School of Medicine; and the Plastic and Reconstructive Surgery Department, Universitair Ziekenhuis Brussel (University Hospital Brussels), Vrije Universiteit Brussel.

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This summary is machine-generated.

Quality and quantity-cultured endothelial progenitor cells significantly enhance fat graft vascularization, reducing fibrosis and inflammation. This method improves graft quality, offering a potential solution for clinical fat grafting limitations.

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Area of Science:

  • Regenerative Medicine
  • Tissue Engineering
  • Vascular Biology

Background:

  • Fat grafting is crucial for soft-tissue reconstruction, but graft survival is limited by ischemia.
  • Early vascularization of transplanted adipocytes is vital for successful fat grafts.
  • Quality and quantity (QQ) culture enhances endothelial progenitor cells' (EPCs) vasculogenic potential.

Purpose of the Study:

  • To investigate if QQ-cultured EPCs improve vascular network formation and fat graft survival in a murine model.
  • To evaluate the impact of QQ-cultured EPCs on graft vascularity, histology, and gene expression.

Main Methods:

  • Endothelial progenitor cell precursors (c-KitSca-1Lin cells) were isolated from mice.
  • Adipose tissue was grafted with QQ-cultured KSL cells, uncultured KSL cells, adipose-derived stem cells (ASCs), or a combination, compared to controls.
  • Graft weight, histology, immunohistochemistry, and gene expression were analyzed at 5 and 10 weeks.

Main Results:

  • QQ-cultured KSL cells, especially in combination with ASCs, significantly increased vessel density.
  • QQ-cultured KSL cells reduced graft fibrosis and local inflammation.
  • Upregulation of platelet-derived growth factor and adiponectin was observed with QQ-cultured KSL cells.

Conclusions:

  • Supplementing fat grafts with QQ-cultured EPCs effectively stimulates vascularization.
  • Enhanced vascularization correlates with reduced fibrosis, inflammation, and improved adipose tissue integrity.
  • QQ-cultured EPCs represent a promising strategy to overcome clinical limitations of fat grafting.