Charlotte Helfrich‐Förster
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Synchronization of women’s menstruation with the Moon has decreased but remains detectable when gravitational pull is strong Open
To increase reproductive success, many species synchronize reproductive behavior with a particular phase of the lunar cycle. The human menstrual cycle has also a period close to that of the lunar cycle, and recent studies suggest a tempora…
RHODOPSIN 7: An ancient non-retinal photoreceptor for contrast vision, darkness detection, and circadian regulation Open
1 Abstract Animals rely on light not only for vision but also to adapt behavior to their environment. In Drosophila , most rhodopsins mediate retinal image formation, but RHODOPSIN 7 ( RH7) is widely expressed in the brain and optic lobe, …
A short photoperiod alters brain metabolism and cold resistance in Drosophila melanogaster Open
To survive, animals need to prepare for winter in advance, and this process begins in the brain in response to the shortening of the photoperiod in fall. Here, we demonstrate that exposing adult flies for just 14 days to a short photoperio…
View article: A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing
A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing Open
Antarctic krill is a species with fundamental importance for the Southern Ocean ecosystem. Their large biomass and synchronized movements, like diel vertical migration (DVM), significantly impact ecosystem structure and the biological carb…
View article: “A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing”
“A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing” Open
Antarctic krill is a species with fundamental importance for the Southern Ocean ecosystem. Their large biomass and synchronized movements, like diel vertical migration (DVM), significantly impact ecosystem structure and the biological carb…
Career perspective Open
In this career perspective article, the author describes her long pathway to a professorship in Germany.
Correlation between circadian and photoperiodic latitudinal clines in <i>Drosophila littoralis</i> Open
Insects can survive harsh conditions, including Arctic winters, by entering a hormonally induced state of dormancy, known as diapause. Diapause is triggered by environmental cues such as shortening of the photoperiod (lengthening of the ni…
View article: A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing
A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing Open
Antarctic krill is a species with fundamental importance for the Southern Ocean ecosystem. Their large biomass and synchronized movements, like diel vertical migration (DVM), significantly impact ecosystem structure and the biological carb…
View article: A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing
A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing Open
Antarctic krill is a species with fundamental importance for the Southern Ocean ecosystem. Their large biomass and synchronized movements, like diel vertical migration (DVM), significantly impact ecosystem structure and the biological carb…
Correlation between circadian and photoperiodic latitudinal clines in <i>Drosophila littoralis</i> Open
Insects can survive harsh conditions, including Arctic winters, by entering a hormonally induced state of dormancy, known as diapause. Diapause is triggered by environmental cues such as shortening of the photoperiod (lengthening of the ni…
View article: Synaptic connectome of a neurosecretory network in the Drosophila brain
Synaptic connectome of a neurosecretory network in the Drosophila brain Open
Hormones mediate inter-organ signaling which is crucial in orchestrating diverse behaviors and physiological processes including sleep and activity, feeding, growth, metabolism and reproduction. The pars intercerebralis and pars lateralis …
View article: Synaptic connectome of a neurosecretory network in the Drosophila brain
Synaptic connectome of a neurosecretory network in the Drosophila brain Open
Hormones mediate inter-organ signaling which is crucial in orchestrating diverse behaviors and physiological processes including sleep and activity, feeding, growth, metabolism and reproduction. The pars intercerebralis and pars lateralis …
The Never Given 2022 Pittendrigh/Aschoff Lecture: The Clock Network in the Brain—Insights From Insects Open
My journey into chronobiology began in 1977 with lectures and internships with Wolfgang Engelmann and Hans Erkert at the University of Tübingen in Germany. At that time, the only known animal clock gene was Period , and the location and or…
View article: Synaptic connectome of a neurosecretory network in the <i>Drosophila</i> brain
Synaptic connectome of a neurosecretory network in the <i>Drosophila</i> brain Open
Hormones mediate inter-organ signaling which is crucial in orchestrating diverse behaviors and physiological processes including sleep and activity, feeding, growth, metabolism and reproduction. The pars intercerebralis and pars lateralis …
Photoreceptors for immediate effects of light on circadian behavior Open
Animals need to sharpen their behavioral output in order to adapt to a variable environment. Hereby, light is one of the most pivotal environmental signals and thus behavioral plasticity in response to light can be observed in diurnal anim…
Neuropeptidergic regulation of insect diapause by the circadian clock Open
Diapause is an endocrine-mediated strategy used by insects to survive seasons of adverse environmental conditions. Insects living in temperate zones are regularly exposed to such conditions in the form of winter. To survive winter, they mu…
Ingeborg Beling and the time memory in honeybees: almost one hundred years of research Open
Bees are known for their ability to forage with high efficiency. One of their strategies to avoid unproductive foraging is to be at the food source at the right time of the day. Approximately one hundred years ago, researchers discovered t…