Electromagnetic Fields and Biomembranes

1. Concerning some Variations of the Characteristics of Electrochemically Active Membranes after Pulse Magnetic and Electromagnetic Field Action

   • N. Kentchev, N. Popdimitrova, N. Todorov, N. Anachkova

   Pages 157-160

2. Effects of Low Frequency Magnetic Fields on Chick Embryos and Embryonal Chick Tibia

   • Keijo Saali, Jukka Juutilainen, Tapani Lahtinen

   Pages 161-164

3. The Influence of the Magnetic Field upon the Hatching Capacity of Poultry and upon Plant Seeds

   • Angela Ottová, Štefan Neuschl

   Pages 165-167

4. The Geomagnetic Field as a Lowenergetic Factor with Important Biological Significance

   • Dimiter Mikhov

   Pages 169-171

5. Electrorotation — Influence of Pulse Shape and Internal Membrane Systems on Rotation Spectra

   • J. Gimza, E. Donath, R. Glaser

   Pages 173-177

6. Electrorotation Measurements on Mouse Blastomers

   • Torsten Müller, Günter Fuhr, Frank Geißler, Rolf Hagedorn

   Pages 179-182

7. Effect of the Temperature on the Cell Contact by Dipolophoresis and Electrofusion

   • R. Pancheva, M. Naplatarova, P. Antonov

   Pages 183-186

8. The Effect of Surface Charged Modifiers on Halobacterium halobium Purple Membrane Phase Transitions

   • Nezabravka Popdimitrova, Jan Gutowicz, Andrey Atanassov, Andrzej Krawczyk, Minko Petrov, Stanislaw Miekisz

   Pages 187-190

9. Surface-Induced Orientation and Elasticity in Purple Membrane Thin Film Media

   • Minko Petrov, Nezabravka Popdimitrova, Andrey Atanassov

   Pages 191-194

10. A Study of the Fluorescence Spectra of Native and Monomeric Bacteriorhodopsin in Purple Membranes

    • Tzvetana Lazarova-Skumrieva, Alexander Ivanov

    Pages 195-198

11. HCO3-Stimulated ATPase Activity of Brain Mitochondria: The Role of Ca2+ and Ca2+ and Mg2+ Ions Combination

    • Radoy I. Evanov, Nina Lambadjieva

    Pages 199-202

12. The Influence of Acetylcholine and Serotonin on the HCO3-ATPase Activity of Brain Mitochondria

    • Radoy I. Ivanov, Dobrinka K. Dobreva

    Pages 203-206

13. Effect of Chloramine-T on Single Sodium Channels in Neuroblastoma Cells

    • Ilko Iliev, Karoly Nagy

    Pages 207-210

14. A Rectifying Potassium Channel in Human Neuroblastoma Cells

    • Tuula Jalonen

    Pages 211-214

15. Effect of Ions and ATP on the /3H/QNB Binding to Muscarinic Cholinergic Receptors in Rat Brain Synaptic Membranes

    • Nevena Mouleshkova, Petja Naumova

    Pages 215-218

16. The Role of Some Cryoprotectants on the Survival of Ram Spermatozoa. A Study on the Membrane Fluidity

    • Antoaneta Ilieva, Alexander Ivanov, Pavel Marinov

    Pages 219-222

17. Regulation of the Quantum Yield of Photosynthesis in Chlorella During Nutrient Limited Growth

    • Pavel S. Venediktov

    Pages 223-226

18. Surface Charge Density and Rotational Diffusion of Liposome Reconstituted Photosystem I Reaction Centres Studied by Spin-Label Technique

    • Tsvetan Gantchev

    Pages 227-230

19. Structural and Functional Characterization of the Effects of Detergent Treatment on Chloroplast Membranes

    • Emilia Apostolova, Alexander Ivanov

    Pages 231-235

20. The Heat Stability of the Photosynthetic Apparatus During the Process of High Temperature Acclimation

    • Atanaska Andreeva, Mariela Marinova, I. Yordanov

    Pages 237-240

The First International School on "Electromagnetic Fields and Biomembranes" took place in Pleven, Bulgaria on 6-12 October 1986. It was designed as an advanced course through a collaboration of the Biological Faculty of Sofia University and the Council of the Bioelectrochemical Society. In an advanced course the lecturers are specialized in particular areas, and the students are usually specialists in related areas. We have captured the expertise of both groups of participants in this volume. The longer papers prepared by the lecturers are joined with the shorter papers based on the posters presented by the "students" to provide a summary of the school as well as an indication of current research directions in the field. The course was designed to provide the latest information about biomembrane structure and function, covering the properties of both the lipid matrix and the recently characterized proteins that function as specialized channels and receptors. Real membranes and various models were covered, with an emphasis on understanding their mechanisms of interaction with various exogenous stimuli (e.g., electric, magnetic, light, etc.). Several practical applications of this information (e.g., electroporation, electro-fusion) were also presented with indications of the possibilities for new developments in biotechnology. The mixture of basic science with practical applications, together with the int~rmingling of lecturers and students from many different countries produced a stimulating atmosphere and effective teaching. We hope that this volume will transmit some of this atmosphere.

• Biomembran
• electromagnetic
• electromagnetic fields
• magnetic fields
• proteins

• Sofia University, Sofia, Bulgaria

  Marko Markov

• Columbia University, New York, USA

  Martin Blank

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