Posts Tagged ‘chronobiology’

This lecture from Alexander Wunsch was presented at the 84th International Conference on Light and Vision of the College of Syntonic Optometry (CSO) in Indianapolis, IN, USA.
In photobiology, the definition of action spectra is a crucial step in understanding the underlying mechanisms. Once the action spectrum is found, it often serves as a guide for phototherapeutic interventions, aiming to match the wavelength as closely as possible. Lasers and LED light sources are on the rise and widely available. Monochromatic light is highly effective – but mother nature´s light sources are differently composed. The presentation discusses the value of diligently combined wavelengths even from opposite regions of the light spectrum for phototherapy, photoprevention and cosmetic use.
Remarks: Some of the topics have been addressed in other presentations provided on my vimeo account. Anyhow, repetitions can help to make things clearer. Or, in Latin words: repetitio est mater studiorum…

I have just discovered that this amazing book from Prof. Fritz Hollwich can be downloaded from Springer Link as a pdf at a very reasonable price ($69.99) compared to the softcover reprint (e. g. Amazon, 93.08 €) and original hardcover edition (e. g. Amazon, 551.70 € and more…).

From the preface:

„This book was written to show that light is a primal element of life. All life originates and develops under the influence of the light of the sun, that „super­ terrestrial natural force“ (Goethe).“

„Sunlight influences the vital processes not only of the plant (e. g. , heliotropism, photosynthesis) and the animal (e. g. , color change, maturation of the gonads) but of man as well. The human organism too reacts „heliotropically,“ as the 24­ hour rhythm of the sleep-waking cycle demonstrates.“

„Artists have always perceived clearly the intensive stimulatory effect sunlight on their activity.“

„One is reminded here of Cesare Lombroso, who wrote to his daughter „that thoughts come in the greatest profusion when (my) room is flooded with the sun’s rays.“ Richard Wagner exclaimed: „If only the sun would come out, I would have the score finished in no time.“ Bernard Shaw had a little cottage where he worked that could be turned according to the position of the sun. The composer Humperdinck wrote: „The sun is indispensable for my work; that is why it is important for me to have my study face east or south.“ As these few examples indicate, it is above all those active in the arts who intuitively grasp the positive influence of sunlight on the psycho-physical efficiency of their organism.“

„In an age, however, when fluorescent lighting turns night into day, we are in danger of forgetting that man is a creature of nature as well as of culture.“

„Artificial light cannot replace natural daylight.“


ALAN 2016


Exposure to Light at Night May Cause Depression, Learning Issues, JHU Biologist Says « News from The Johns Hopkins University.

Proc Natl Acad Sci. 2011; doi:10.1073/pnas.1008882108

via scinexx | Botenstoff eicht innere Uhren auf „alt“: Senile Bettflucht im Alter beruht nicht auf anderem „Ticken“ der Uhrengene – Innere Uhr, senile Bettflucht, Uhrengen, Frühaufsteher, Alter, Schlaf, Wachzeiten, Botenstoff, Zelluhren, Lerche, Eule, Biorhythmus, Chronotyp.



nachtstudio –

nachtstudio –


Sonntag (auf Montag), 06.12.2009, ca. 00.15 Uhr

“Mehr Licht! – Die Elektrifizierung der Welt”

“1,6 Milliarden Menschen weltweit haben keinen Zugang zu Elektrizität. Nur die Nordhalbkugel des Globus, besonders Europa, Japan und Amerikas Küsten, sind nachts von einem glitzernden Lichtband bedeckt. Licht bedeutet Sicherheit und symbolisiert Reichtum. Doch die Elektrifizierung der Welt hat auch Schattenseiten: Durch zu viel Licht ist unser ökologisches Gleichgewicht empfindlich gestört worden. Ist neben dem Planeten auch unsere Gesundheit von zu viel oder falschem Licht bedroht? Mediziner warnen: unruhiger Schlaf, veränderte Hormonhaushalte und sogar ein erhöhtes Risiko, an Krebs zu erkranken, seien Konsequenzen des Lichtsmogs. Kann uns Licht vergiften? Ist die Erhellung der Welt, einst Symbol für Aufklärung und Fortschritt, letztlich ein “kultureller Verlust”?

Beate Binder, Kulturanthropologin und Elektrifizierungs-Expertin
Ralf Bönt, Autor und Physiker
Klement Tockner, Biologe und Leiter des Projekts “Verlust der Nacht”
Alexander Wunsch, Humanmediziner und Lichtbiologe”

Weiter im Text unter folgendem link:

nachtstudio –

Wer die Sendung verpasst oder die späte Sendezeit aus chronobiologischen Notwendigkeiten heraus nicht akzeptieren kann ;-) , hat einige Wochen nach der Sendung noch die Möglichkeit, diese jederzeit in der ZDF Mediathek online anzusehen: mit dem Zweiten sieht man besser!

Using Light to Help the Elderly Sleep –

Light Pollution Press Releases

2009 5 October: Blue Light Threatens Animals and Humans

viaLight Pollution Press Releases.

Light Pollution — National Geographic Magazine.

Our Vanishing Night

Most city skies have become virtually empty of stars.

By Verlyn Klinkenborg
Photograph by Jim Richardson