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Related Concept Videos

Density00:56

Density

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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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Current Density01:21

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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Simplified Synchronous Machine Model01:30

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The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
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Bulk Density of Aggregate01:22

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Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
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Strain-Energy Density01:20

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Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
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Density and Archimedes' Principle01:05

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When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
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Author Spotlight: Tracing the Ferroptotic Signatures and Cell Death Dynamics in Medulloblastoma for Advanced Therapeutics
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A simplified approach using Taqman low-density array for medulloblastoma subgrouping.

Gustavo Alencastro Veiga Cruzeiro1, Karina Bezerra Salomão2, Carlos Alberto Oliveira de Biagi3

  • 1Department of Pediatrics Ribeirão Preto Medical School, Hospital das Clínicas, University of São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, São Paulo, Brazil. gavcruzeiro@gmail.com.

Acta Neuropathologica Communications
|March 6, 2019
PubMed
Summary

A simplified TaqMan Low Density array (TLDA) assay using 20 genes accurately classifies medulloblastoma (MB) subgroups. This cost-effective method, further refined to six genes, offers rapid molecular assignment for clinical decisions, especially in low-resource settings.

Keywords:
Brazilian cohortMedulloblastomaMolecular subgroupsReal-time PCR

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Isolation, Enrichment, and Maintenance of Medulloblastoma Stem Cells
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Area of Science:

  • Oncology
  • Genomics
  • Molecular Biology

Background:

  • Next-generation sequencing is crucial for medulloblastoma (MB) risk stratification and prognosis.
  • Low and middle-income countries face challenges accessing accurate, cost-effective molecular classification platforms for MB.

Purpose of the Study:

  • To develop and validate a cost-effective TaqMan Low Density array (TLDA) assay for molecular subtyping of medulloblastoma.
  • To assess the feasibility of using a simplified gene set for accurate MB classification in resource-limited settings.

Main Methods:

  • Performed TLDA assay on 92 medulloblastoma samples using 20 genes.
  • Assessed TLDA methodology in silico on 763 MB samples (GSE85217) and validated using Methylation Array 450K on 11 MB samples.
  • Utilized Pearson distance with average-linkage and Ward.D2 algorithms for classification; reduced gene set to six genes for simplified stratification.

Main Results:

  • TLDA with 20 genes accurately assigned MB samples into WNT, SHH, Group 3, and Group 4 subgroups, showing concordance with Methylation Array 450K.
  • In silico analysis of 763 MB samples achieved high accuracy (92.36-99.1%) for subgroup classification.
  • A simplified six-gene panel effectively classified MB into SHH, WNT, and non-SHH/non-WNT subgroups with minimal loss of accuracy.

Conclusions:

  • TLDA is a rapid, simple, and cost-effective assay for medulloblastoma classification, suitable for low/middle-income countries.
  • A simplified six-gene method for stratifying MB into SHH, WNT, and non-SHH/non-WNT subgroups is a promising approach for clinical decision-making.