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Related Concept Videos

Feedback control systems01:26

Feedback control systems

537
Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
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Quantifying Work02:30

Quantifying Work

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As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the surroundings to the system.
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Saint-Venant's Principle01:18

Saint-Venant's Principle

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The principle of Saint-Venant postulates that the stress distribution within a structural member does not rely on the precise method of load application except in the vicinity of the load application points. Consider a scenario where loads are centrally applied on two plates. In this case, the plates move toward each other without any rotation. This movement causes the member to contract in length and expand in width and thickness. Uniform deformation across all elements and maintaining...
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Rab Cascades01:25

Rab Cascades

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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The Electron Transport Chain01:30

The Electron Transport Chain

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
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Electro-mechanical Systems01:19

Electro-mechanical Systems

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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Related Experiment Video

Updated: Nov 6, 2025

Micro-scale Engineering for Cell Biology
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Micro-scale Engineering for Cell Biology

Published on: October 1, 2007

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Comment.

Dean Follmann1

  • 1Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland.

Statistics in Medicine
|May 8, 2021
PubMed
Summary
This summary is machine-generated.

Comparing the AIDS and COVID-19 pandemics reveals shared challenges in public health and statistical analysis. Lessons learned from HIV/AIDS can inform responses to future viral outbreaks like coronavirus disease 2019.

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Last Updated: Nov 6, 2025

Micro-scale Engineering for Cell Biology
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Micro-scale Engineering for Cell Biology

Published on: October 1, 2007

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Area of Science:

  • Epidemiology
  • Public Health
  • Biostatistics

Background:

  • The Acquired Immunodeficiency Syndrome (AIDS) and coronavirus disease 2019 (COVID-19) pandemics represent significant global health crises.
  • Both pandemics have necessitated robust statistical methodologies for understanding disease spread, impact, and control.

Purpose of the Study:

  • To review and identify common themes and statistical challenges observed during the AIDS and COVID-19 pandemics.
  • To leverage statistical insights from the AIDS epidemic to inform strategies for managing the COVID-19 pandemic and future public health emergencies.

Main Methods:

  • Comparative analysis of epidemiological data and public health responses.
  • Review of statistical modeling techniques applied to both pandemics.
  • Examination of data collection, analysis, and dissemination strategies.

Main Results:

  • Identification of recurring challenges in real-time data acquisition and analysis.
  • Similarities in the need for accurate disease surveillance and predictive modeling.
  • Common difficulties in communicating complex statistical information to the public and policymakers.

Conclusions:

  • Statistical approaches are critical for navigating complex public health crises.
  • Cross-pandemic learning can enhance preparedness and response effectiveness.
  • The National Institutes of Health (NIH) plays a vital role in advancing statistical science for public health.