"Ultra-high Dilution" 1994 revisited 2014: Follow up of experiments and theories
Authors: Endler PC , Schulte Jurgen , Schroeer Beate Stock 
Published: August 2021

Background: â€œResearch in ultra-high dilutions, and the interaction of ultra-high dilutions and living systems, has reached a level of quality and popularity that it is about to be taken seriously by current â€¦ sciences â€¦â€ the editors wrote in their introduction to â€œUltra High Dilution. Physiology and Physicsâ€, published by Kluwer (now Springer) in 19941. Back then, this anthology assembled contributions of leading scientists in fundamental and clinical research on homeopathy. Over the following two decades, it became widely quoted within the homeopathic community and also known in other research communities.
Aim: To re-visit and review the 1994 studies in biology, physics, biophysics and clinics from the perspective of 2014.
Methods: As a rule, the original authors from 1994 or closed laboratory colleagues were asked to contribute papers covering their research efforts and learnings in the period from1994 up to 2014. These contributions were a) edited and cross-referenced and b) peer reviewed via the Elsevier Electronic System in preparation of a special issue of the journal â€œHomeopathyâ€, London, to appear in October 2015.
Results: Part 1 (Biology) includes chapters
â€¢	on dose-dependent hormesis effects in low and very low doses by Menachem Oberbaum, who was also the author on this topic in 1994;
â€¢	on further results on the â€œclassicalâ€ model with wheat and an ultra high dilution (UHD) of a silver salt by Waltraud Scherer-Pongratz, also author in 1994, et al.; on the model with highland amphibians and an UHD of the hormone thyroxine by Christian Endler, also author in 1994, et al.; and on a new model derived from the latter two, combining wheat and a plant hormone by Scherer-Pongratz and Endler;
â€¢	on a botanical and a zoological survey on high dilution research by the new contributors Tim JÃ¤ger, Stephan Baumgartner et al. and Leoni Bonamin et al., as well as a survey on immunological research by Bernard Poitevin, also author in 1994.
â€¢	on UHD research from the laboratory of Madeleine Bastide, decedÃ©e, now pursued by Bonamin, and from the laboratory of Jacques Benveniste, decedÃ©, now pursued by YolÃ©ne Thomas;
Part 2 (Biophysics) includes chapters
â€¢	on effects of homeopathic medicines in closed vials by Roeland van Wijk, also author in 1994, et al.;
â€¢	on electromagnetic and magentic vector potential bio-information and water by Cyril Smith, also author in 1994;
Part 3 (Physics) includes chapters
â€¢	on investigation topics, models and theories presented by various authors in 1994, followed up by Jurgen Schulte;
â€¢	on experimental methods by Schulte, also author in 1994;
â€¢	on the recent discussion on the theory of entanglement by Schulte
Part 4 (Clinics) includes chapters
â€¢	on provings of UHDs on healthy volunteers by Harald Walach, also author in 1994;
â€¢	on a review by Robert Mathie of clinical research on homeopathy, as a follow-up to Max Haidvoglâ€™s contribution (Haidvogl being happily retired) referring to Klaus Linde in 1994.
Furthermore,
â€¢	a contribution on quality and standards of reporting in homeopathy research was added by Beate Stock-Schroer,
â€¢	a bibliographic survey on repetitions of experiments on UHDs by Endler et al. was included,
â€¢	the outlook on â€œpreliminary elements of a theory on UHDsâ€ from 1994 was updated by the editors;
â€¢	and Marco Righetti, as well as Peter Fisher, also contributors in 1994, wrote prefaces.
Conclusion: â€œUltra High Dilution revisitedâ€, the special issue of â€œHomeopathyâ€, October 2015, may be seen as a â€œbuena vista social clubâ€ of homeopathy researchers 1994 (luckily supported by younger colleagues), as a disclosure of new results on the old models (what happened between 1994 and 2014?), as well as a general survey on the state of UHD research.