Manna Method

The Mann method is a method for examining body tissue under a microscope, which was developed by the American histologist and physiologist George Mann in the 19th century.

Mann was one of the first scientists to study human body tissue under a microscope. He was interested in understanding how the body's organs and systems worked and how they interacted with each other. Mann developed a method that allowed him to study tissues at the microscopic level, allowing him to better understand their structure and function.

Mann's method was based on the use of a special dye, which made it possible to better see the structure of tissues. This dye was called hematein and was obtained from animal blood. Mann used hematein to stain tissues and then examined them under a microscope.

MANNA METHOD (Gramman method) is a receptor method for testing the mechanical properties of a material (strength, elasticity, hardness, etc.), in which a sample of the material, as a result of repeated stretching or compression, is deformed to the yield point and after each test cycle is subjected to visual inspection. Several variants of the method have been developed.

The simplest of them, in modern terminology called the division method, allows one to determine approximately the specific work of reproduction. However, the error of the method increases with increasing sample size and is unsuitable for determining small work functions.

To avoid this, the sample must be small enough, but it must also have sufficient energy. For any material there is a threshold sample size, below which analysis of its structure is impossible, because the workpiece turns out to be one-time. At sizes above this threshold, a “seam effect” is observed. It occurs due to the fact that the stress state of the seam is different from the stress state