Mass Accumulation
Mass Accumulation - Related Videos
01:27
Cost Accumulation and Flow
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2026
In manufacturing, production costs are accumulated and tracked to understand how resources are consumed and how they contribute to the final product. This process, known as cost accumulation, involves recording material, labor, and overhead costs and linking them to specific cost objects, such as individual products or production processes.Costs flow through inventory accounts in a sequence that mirrors the physical movement of goods. Initially, raw materials are recorded in the raw materials...
04:02
An Assay to Measure the Accumulation of a Fluorescent Antibiotic Probe in Bacterial Cells
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2025
This video demonstrates an assay to measure the accumulation of a fluorescent antibiotic probe in bacterial cells. Exposure to an efflux pump inhibitor disrupts the transmembrane proton gradient in bacterial cells, upon which a fluorophore-conjugated antibiotic is added. Inhibition of efflux pumps due to the disrupted proton gradient causes accumulation of the antibiotic inside the bacteria. Bacterial cells are lysed, and the fluorescence intensity is measured to confirm antibiotic accumulation.
09:48
Monitoring of Nanodrug Accumulation in Murine Breast Cancer Metastases
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Cited by 1 •
2024
Here, we describe the protocol for in vivo delivery of magnetic iron oxide nanoparticles carrying RNA oligomers to metastatic breast cancer in animal models, providing a clinically viable approach for the therapeutic silencing of oncogenic nucleic acids.
09:00
Spatial Measurements of Perfusion, Interstitial Fluid Pressure and Liposomes Accumulation in Solid Tumors
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Cited by 6 •
2016
The heterogeneous intra-tumoral accumulation of liposomes has been linked to an abnormal tumor microenvironment. Herein methods are presented to measure tumor microcirculation by perfusion imaging and elevated interstitial fluid pressure (IFP) using an image-guided robotic system. Measurements are compared to the intra-tumoral accumulation of liposomes, determined using volumetric micro-CT imaging.
01:54
Molar Mass
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2020
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties. Atoms and molecules are extremely...
FAQs
Mass accumulation provides a way to distinguish systems whose stored amount remains constant from systems that are changing over time. At steady state, storage does not change because the relevant entering, leaving, generation, and consumption effects balance. Under transient conditions, a nonzero change indicates that the system is gaining or losing material as operation evolves.
Internal generation and consumption must be included alongside material crossing the system boundary. Generation increases the stored amount, while consumption reduces it, so ignoring either can produce an incorrect balance. Phase changes also require attention because material may change form within the system, affecting how engineers account for storage and process behavior.
The system boundary determines which material streams are classified as entering or leaving and which effects are treated as internal. A boundary around a tank, reactor, pipeline, separation unit, or environmental system therefore produces a balance tailored to that unit. Choosing the defined system carefully helps engineers compare the appropriate flows and internal processes.
Engineers first define the system being analyzed, then identify material entering and leaving it over the period of interest. They account for any internal generation, consumption, or phase changes, and compare these contributions with the change in stored material. This organized balance supports analysis of both steady operation and changing process conditions.
The analysis is especially useful when engineers need to understand how reactors, tanks, pipelines, separation units, or environmental systems behave over time. It supports predictions under transient conditions and helps evaluate whether operation is consistent with expected material flows. Engineers can use those results to assess process performance and improve system reliability.
Quantifying changes in stored material helps engineers predict how a system will respond and determine whether equipment can support its intended operation. The results can reveal process inefficiencies by comparing actual material behavior with expected inflow, outflow, and internal effects. This information also contributes to maintaining safe and reliable operation in engineered systems.