## 2 Materials and Methods  
### Generating a Controlled Magnetic Field  
The experiments were carried out using relatively weak magnetic fields with values less than or comparable to the parameters of the geomagnetic field (GMF). The constant component of GMF is usually in the range of 30 to 65 \(\mu\)T, and the variable component corresponded to the intensity and frequency ranges close to the industrial levels ubiquitous in laboratory rooms (-50 Hz, -50 nT).  
Therefore, to standardize experimental conditions and minimize the effect of environment, specialized research equipment was used--a device for generating a controlled magnetic field (Figure 1).  
A magnetically shielded chamber was comprised of three co-axial nested cylinders made of permalloy (1 mM thick), each covered with a removable lid with a hole in it for cable feed-through (the inner screen measured 22 cm in diameter and 42 cm in length) (Figure 1). This enclosure provided a high level of GMF reduction--up to 10,000 times (a residual static magnetic field of no more than 20 nT), and also significantly reduced the electromagnetic environmental noise (down to several nT). The magnetic fields were directly measured with a Mag-03 MS100 fluxgate magnetometer (Bartington Instruments, Witney, UK).  
To create a weak CMF (static or alternating), a coil (solenoid) was placed inside the chamber. The solenoid (18 cm in diameter and 36 cm long) consisted of 720 turns of copper wire 1 mM in diameter and had a winding resistance of 7.5 ohms. The test samples were placed inside the solenoid along the central axis.  
The solenoid was connected to a DC source to generate a static magnetic field (SMF). An alternating magnetic field (AMF) of required frequency and amplitude was generated using a digital and analog transducer (DAT) based on an L-791 card (L-Card Company, Moscow, Russia). Two frequencies of the variable component of CMF were used--12.6 Hz, which is equivalent to the ion cyclotron resonance (ICR) frequency of the hydrated hydronium ion (H\({}_{3}\)O\({}^{+}\) (H\({}_{2}\)O\({}_{3}\)) [15], as well as 48.5 Hz, which is equivalent to the ICR frequency of the hydronium ion H\({}_{3}\)O\({}^{+}\)[2,16]. These frequencies were calculated using the standard equation:  
\[f_{c}\ =\ qB_{DC}/2\pi m \tag{1}\]  
where \(q\) and \(m\) are ion charge and ion mass, and \(B_{DC}\) is induction of the static component of CMF (SMF of 60 \(\mu\)T).  
To generate an AMF, an alternating current of sinusoidal waveform, described by the equations below, was passed through the solenoid:  
\[I(t)\ =\ A\cos\omega t \tag{2}\]  
\[\omega\ =\ 2\pi f \tag{3}\]  
where \(f\)--frequency in Hz.  
Thus, the controlled magnetic field generation device could operate in one of the following modes:  
Mode 1--CMF (SMF of 60 \(\mu\)T, AMF of 100 nT, which is formed according to the sinusoidal regime with a frequency of 12.6 Hz or 48.5 Hz)  
Mode 2--SMF of 60 \(\mu\)T  
Figure 1: Controlled magnetic field generation device. 1—Permalloy shields; 2—Solenoid (magnetic copper wire coil); 3—Cuvette with an acceptor sample (sample of IFNy or water); 4—Cuvette with a donor sample (HD Abs to IFNy or HD PMA); B\({}_{\rm AC}\)—Magnetic induction produced by alternating current; B\({}_{\rm DC}\)—Magnetic induction produced by direct current.  
Mode 3--\"zero\" magnetic field (\"0\"MF or \"magnetic vacuum\", in this case, the current sources were disconnected from the solenoid, and the shielding was maintained; residual magnetic field \(\sim\)20 nT).