Table of Contents

## What are QM calculations?

In QM calculations, the Schrödinger equation is solved for a molecular system (Cramer, 2006, Jensen, 2007). The input is the coordinates, the net charge, and the total spin. The result is the total energy and the wavefunction, from which all measureable properties of the system can be calculated.

### What is ChemShell?

ChemShell is a modular computational chemistry package with a particular focus on hybrid quantum mechanical/molecular mechanical (QM/MM) simulations.

**What is QM MM method?**

In QM/MM methods, the region of the system in which the chemical process takes place is treated at an appropriate level of quantum chemistry theory, while the remainder is described by a molecular mechanics force field. Within this approach, chemical reactivity can be studied in large systems, such as enzymes.

**What does QM mm mean?**

quantum mechanics/molecular mechanics

The hybrid QM/MM (quantum mechanics/molecular mechanics) approach is a molecular simulation method that combines the strengths of ab initio QM calculations (accuracy) and MM (speed) approaches, thus allowing for the study of chemical processes in solution and in proteins.

## Who developed the Qmm?

QIT Madagascar Minerals (QMM), is a joint venture between Rio Tinto (80%) and the government of Madagascar (20%).

### How is protein radius of gyration calculated?

Rg = 0.395*N3/5 + 7.257 This filter can be employed to evaluate the value of radius of gyration for a given protein and to find out whether the protein follows the above equation or not.

**What is NPT equilibration?**

Equilibration of pressure is conducted under an NPT ensemble, wherein the Number of particles, Pressure, and Temperature are all constant. The ensemble is also called the “isothermal-isobaric” ensemble, and most closely resembles experimental conditions.

**How do you calculate radius of gyration?**

Mechanics: Here radius of gyration about an axis of rotation is calculated using mass moment of inertia and its formula is given by relation, k=√IM(1) (1) k = I M This equation (1) is the radius of gyration formula for mass moment of inertia.

## What is measure of radius of gyration is?

Mathematically the radius of gyration is the root mean square distance of the object’s parts from either its center of mass or a given axis, depending on the relevant application. It is actually the perpendicular distance from point mass to the axis of rotation.