To investigate the influence of microwave irradiation on the cell growth of the yeast Saccharomyces cerevisiae.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
41.6965 GHz
Exposure duration:
continuous for 10 h
|
|
|
Exposure 2:
41.6965 GHz
Exposure duration:
continuous for 10 h
|
|
A total of 37 growth experiments were conducted at 1 nW/cm², 27 with and 10 without MW radiation. Further 33 runs were performed at 5 pW/cm².
| Frequency | 41.6965 GHz |
|---|---|
| Type | |
| Polarization | |
| Exposure duration | continuous for 10 h |
| Additional info | Several frequencies between 41.688 and 41.707 GHz were applied. |
| Modulation type | cf. additional info |
|---|---|
| Additional info |
modulated at 8 kHz, square wave |
| Exposure source |
|
|---|---|
| Chamber | The thermostatted metallic irradiation chamber, coupled by a flexible waveguide with a standardised millimeter wave set-up [Grundler et al., 1983], was mounted on the stage of a scanning microscope. |
| Setup | The radiation was guided through a tapered gold-coated quartz needle broadened by quartz carrier plates on both sides and radiated out of a slot (0.4 mm x 1.7 mm) on which the cells were spread in a monolayer. Yeast cells were fixed to the lower surface of a thin transparent agar layer (0.2 mm) filling the inner part of a smaller plastic ring. The agar layer and the cells rested on the quartz needle and the carrier plates. At the opposite surface of the quartz needle, a broader opening for microscopic viewing was covered with a fine metallic mesh suppressing RF leakage. |
| Additional info | The MW field in the radiating slot was monomodal, and the EF was polarized in the y direction, surrounded by the MF in the x-z plane. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 1 nW/cm² | mean | measured | - | - |
| SAR | 0.04 µW/g | mean | - | - | - |
| Frequency | 41.6965 GHz |
|---|---|
| Type | |
| Polarization | |
| Exposure duration | continuous for 10 h |
| Additional info | Several frequencies between 41.688 and 41.704 GHz were applied. |
| Modulation type | cf. additional info |
|---|---|
| Additional info |
modulated at 8 kHz, square wave |
| Exposure source |
|
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 0.005 nW/cm² | mean | measured | - | - |
| SAR | 0.2 nW/g | mean | - | - | - |
Microwave exposure affects the cell growth rate of the yeast S. cerevisiae in a frequency and intensity dependent manner. Cell growth was either increased or decreased in a range of 10-20%.
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