Use cubes of agar to investigate how cell size impacts diffusion. All biological cells require the transport of materials across the plasma membrane into and out of the cell. By infusing cubes of agar with a pH indicator, and then soaking the treated cubes in vinegar, you can model how difusion occurs in cells.

Agar (/ ˈ eɪ ɡ ɑːr / or / ˈ ɑː ɡ ər /), or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from "ogonori" and "tengusa".

By infusing cubes of agar with a pH indicator, and then soaking the treated cubes in vinegar, you can model how diffusion occurs in cells. Then, by observing cubes of different sizes, you can discover why larger cells might need extra help to transport materials.

For this assay, cells (pretreated with carcinogens or carcinogen inhibitors) are cultured with appropriate controls in soft agar medium for 21-28 days. Following this incubation period, formed colonies can either be analyzed morphologically using cell stain and quantifying the number of colonies formed per well.

This activity uses agar to model a cell to examine why cells must be very small. Agar molds are cut into different sizes and the rate of diffusion is measured by color change of the agar when submerged in vinegar.

A Study of the Relationship between Diffusion and Cell Size Equipment Needs: Agar-agar – non-nutritive Magnetic stirrer/hot plate or microwave oven Phenolphthalein can be purchased in solution (1% in 95% ethanol) or in powder form to dissolve in alcohol to the same concentration.

Diffusion and osmosis are among the most commonly studied topics in biology. Virtually all living cells are, to varying degrees, dependent on these processes. This activity will enable students to explore the relationship between diffusion and cell size by experimenting with model “cells.”

2024年3月1日 · Agar is a substance used in laboratory culture media to support the growth of microorganisms or cells. It provides essential nutrients and a solid surface for cells to adhere to. In addition, Agar is widely used to study bacterial, fungal, and viral pathogens, as well as to isolate and identify various microorganisms.

We introduce a modified agarose cell block technique that enables the synthesis of compact cell blocks by using the entirety of a cell pellet without the loss of diagnostic material during cell block preparations. The feasibility of this technique is illustrated by high-throughput immunocytochemistry using high-density cell block microarray (CMA).

2009年1月1日 · Agar is defined as a strong gelling hydrocolloid from marine algae. Its main structure is chemically characterised by repetitive units of D -galactose and 3-6, anhydro- L -galactose, with few variations, and a low content of sulfate esters.