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Determination of Pi Terms

Determination of Pi Terms

The Buckingham Pi theorem is a valuable method in dimensional analysis, reducing complex relationships between variables into dimensionless terms. Relevant variables in analyzing the lift force on an airplane wing include lift force, air density, wing area, aircraft velocity, and air viscosity. Expressing each variable in terms of fundamental dimensions — mass, length, and time — provides a consistent foundation for constructing these dimensionless terms.
The theorem indicates that...

P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

Biasing of P-N Junction

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

Piaget's Theory of Cognitive Development from Childhood into Adulthood

Piaget's Theory of Cognitive Development from Childhood into Adulthood

Jean Piaget's theory of cognitive development emphasizes the role of thinking in a child's learning process, suggesting that children are naturally curious about their environment. His approach to development is discontinuous, proposing that cognitive abilities progress through distinct stages, each with unique characteristics. Central to Piaget's theory is schemata—mental structures that allow individuals to understand and interpret the world.
Schemata: Building Blocks of Knowledge

PPE Use in Healthcare Settings I: Donning

PPE Use in Healthcare Settings I: Donning

Donning PPE must be completed before contact with the patient. This process protects from infectious agents. The sequence and action included in each donning are critical, and the steps must be systematic to avoid exposure to pathogens. The institutional policy also needs to be followed while donning PPE. The pre-donning preparations are gathering equipment, inspecting the PPE equipment for tears, holes, or damage, removing jewelry, removing any garments below the elbows, and tying the hair...

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Updated: Sep 5, 2025

Chromatin Interaction Analysis with Paired-End Tag Sequencing ChIA-PET for Mapping Chromatin Interactions and Understanding Transcription Regulation

Chromatin Interaction Analysis with Paired-End Tag Sequencing ChIA-PET for Mapping Chromatin Interactions and Understanding Transcription Regulation

Published on: April 30, 2012

Pimchai Chaiyen's biography.

Pimchai Chaiyen¹

¹School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong, 21210 Thailand.

Biophysical Reviews

|July 6, 2022

Summary

This summary is machine-generated.

Professor Pimchai Chaiyen

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BioMEMS: Forging New Collaborations Between Biologists and Engineers

BioMEMS: Forging New Collaborations Between Biologists and Engineers

Published on: November 1, 2007

Area of Science:

Biomolecular Science and Engineering
Enzyme Catalysis
Metabolic Engineering
Synthetic Biology

Background:

Dr. Pimchai Chaiyen is a distinguished professor at VISTEC, with extensive experience in mechanistic enzymology.
Her career includes independent research at Mahidol University and founding the BSE school at VISTEC.
She is recognized globally for her contributions to enzyme catalysis and related fields.

Purpose of the Study:

Investigate enzymatic reaction mechanisms.
Explore enzyme engineering and systems biocatalysis.
Develop innovative applications for metabolic engineering and synthetic biology.

Main Methods:

Mechanistic enzymology training.
Enzyme catalysis research.
Metabolic pathway investigation.
Development of engineered cells and sustainable technologies.

Main Results:

Established expertise in enzyme catalysis, engineering, systems biocatalysis, metabolic engineering, and synthetic biology.
Advanced understanding of enzymatic reaction mechanisms and metabolic pathways.
Initiated collaborations for sustainable and circular economy technologies.

Conclusions:

Dr. Chaiyen's research significantly contributes to enzyme science and its applications.
Her work bridges fundamental research with practical applications in sustainability.
She is a leading figure in biomolecular science and engineering in Thailand and globally.