Biophysics 2

In which conditions a proton in the presence of external magnetic field (B) is in the state characterized by the lowest energy (u is the magnetic moment of the proton) 

Induction of magnetic field changed from 1 Tesla to 2 Tesla. Induce how the resonance frequency in the NMR phenomenon was affected 

 Products in the substance S2 show higher degree of magnetic field screening than those in the substance S1. In an experiment we fix the of the external magnetic field at value of H2 and look for resonance condition by increasing frequency of electromagnetic field from 0Hz upward. Indicate the result of this experiment First will be observed absorption peak for S2 and then for S1 

In an MRI experiment, the electromagnetic field frequency of 70 MHz was used and the value of 2 ppm chemical shift was measured. Indicate the value of change in Larmor’s frequency due to the chemical shift 

Intensity of electrical field E

what happens so the membrane capacitance of a cell if its surface area decreases two fold (2 times) and the membrane become two fold thinner?

 Indicate the effect of the outward (from inside toward the outside of the cell) current of the cations flowing through the cytoplasmic reticulum 

What will be the concequences of an increase in the excitable cell’s input resistance? 

How long will it take for a small particle (e.g. acetylcholine) to diffuse across the distance of 1cm. Let us assume that the diffusion coefficient for this particle in the electrolyte is 10^_m2/s 

indicate the major inhibitory neurotransmitter in the adult brai

When the value of local electrical field intensity in the electrolyte decreases by one half, the Ohm’s law for electrolytes predicts that the current density 

The Fermat principle states that 

indicate for which distance between the object and the converging spherical lens, light emitted from the object will create no image after crossing the lens (f-focal distance) 

indicate the source of magnetic field 

for a current loop the value of magnetic moment is equal to 

active transport may occur due to 

Sound velocity 

Indicate the tissue in which the highest sound velocity propagation takes place 

 sound is a 

the flow of viscous liquid in a cylindrical vessel becomes turbulent 

power supply of the X ray lamp changed from 100kV to 200kV, how this change affected the minimal wavelength of radiation emitted by this lamp? 

Indicate the concequances of application of the RF 90° pulse 

 Chemical shift in the NMR spectra is related to 

Indicate a true statement in relation to the relaxation times T1 and T2 in the NMR experiment 

Liposomes can be formed from lipids using the following methods 

The main disadvantage of liposome medical application is 

The internal energy of a thermodynamic system consists of 

According to the first law of thermodynamics 

Let (delta)S describe the entropy change and (delta)G free Gibbs energy change of the system. The steady state of the system is then characterized by 

The effect used in Geiger-Muller counter function is 

If E0 is the energy of characteristic radiation, Eh-energy of breaking radiation and Et the heat

produced in X-ray tube than 

The main, dangerous products of water radiolysis are 

In photodynamic therapy the energy o flight is absorbed by 

Amorphous silicon is used in active matrix panels in the following purpose 

Comparing the energies carried by different ionization radiations (α,β,γ, Χ) we obtain 

The erm ”population inversion” is used to describe the following situation 

Most of the atoms in a system are ionized 

The sequence of events happening in rod cells after illumination is properly described in 

Comparing the values of acoustic impedances of different media (air-Za, water-Zw, blood-Zb, bone-Zn and granite-Zg) we obtain 

The depolarization of hair cells is caused by