Circadian clocks in crustaceans: identified neuronal and cellular systems
... physiological and behavioural events in an oscillatory pattern. As in many other animal taxa (52), such oscillators are mainly located in the nervous system of crustaceans (20, 21). The core concept of the biological clock builds upon autonomously oscillating neurons or sets of neurons showing circa ...
... physiological and behavioural events in an oscillatory pattern. As in many other animal taxa (52), such oscillators are mainly located in the nervous system of crustaceans (20, 21). The core concept of the biological clock builds upon autonomously oscillating neurons or sets of neurons showing circa ...
Physiology of the Mammalian Circadian System
... THE SUPRACHIASMATIC NUCLEUS, “STILL” THE MASTER CIRCADIAN PACEMAKER IN MAMMALS As described later in this chapter, exciting new results demonstrating that the molecular circadian clock exists in many tissues and organs are revolutionizing our understanding of how the circadian clock system is organi ...
... THE SUPRACHIASMATIC NUCLEUS, “STILL” THE MASTER CIRCADIAN PACEMAKER IN MAMMALS As described later in this chapter, exciting new results demonstrating that the molecular circadian clock exists in many tissues and organs are revolutionizing our understanding of how the circadian clock system is organi ...
highlighted topics - American Journal of Physiology
... continues to run unperturbed in the presence of tetrodotoxin, which blocks these action potentials (75, 88). Because electrical discharge represents one of the pacemaker’s outputs and because the nature of the coupling between the circadian pacemaker and firing rate is not known, there may be some e ...
... continues to run unperturbed in the presence of tetrodotoxin, which blocks these action potentials (75, 88). Because electrical discharge represents one of the pacemaker’s outputs and because the nature of the coupling between the circadian pacemaker and firing rate is not known, there may be some e ...
Using light to tell the time of day: sensory coding in the mammalian
... middle-wavelength (‘green-yellow’) light at negative solar angles. (B) Sensitivity profiles of the four visual opsin proteins responsible for photoreception in mice, illustrating the distinction between colour and brightness: monochromatic light at 365 and 582 nm produces identical activation of mou ...
... middle-wavelength (‘green-yellow’) light at negative solar angles. (B) Sensitivity profiles of the four visual opsin proteins responsible for photoreception in mice, illustrating the distinction between colour and brightness: monochromatic light at 365 and 582 nm produces identical activation of mou ...
Circadian Organization in Hemimetabolous Insects
... rhythm, the bilaterally paired clocks form a functional unit. They interact to produce a stable time structure within individual insects by exchanging photic and temporal information through neural pathways, in which serotonin and pigment-dispersing factor (PDF) are involved as chemical messengers. ...
... rhythm, the bilaterally paired clocks form a functional unit. They interact to produce a stable time structure within individual insects by exchanging photic and temporal information through neural pathways, in which serotonin and pigment-dispersing factor (PDF) are involved as chemical messengers. ...
Introduction 9 INTRODUCTION Circadian rhythms in physiology and
... is located in the suprachiasmatic nuclei (SCN) at the base of the hypothalamus. First indications were provided in 1972, when it was shown that lesions of the SCN abolish the adrenal corticosterone rhythm, as well as rhythms in drinking and locomotor activity. In 1990, it was demonstrated that trans ...
... is located in the suprachiasmatic nuclei (SCN) at the base of the hypothalamus. First indications were provided in 1972, when it was shown that lesions of the SCN abolish the adrenal corticosterone rhythm, as well as rhythms in drinking and locomotor activity. In 1990, it was demonstrated that trans ...
Biological Rhythms
... joined, CLK-CYC produce two other proteins, PERIOD and TIME (PER-TIM). PERTIM has the effect of rendering the CLK-CYC proteins inactive, so that, as PERTIM increases, CLK-CYC decreases and therefore PER-TIM starts to decrease too (negative feedback). This loop takes about 24 hours and, hey presto, y ...
... joined, CLK-CYC produce two other proteins, PERIOD and TIME (PER-TIM). PERTIM has the effect of rendering the CLK-CYC proteins inactive, so that, as PERTIM increases, CLK-CYC decreases and therefore PER-TIM starts to decrease too (negative feedback). This loop takes about 24 hours and, hey presto, y ...
Biological Rhythms
... joined, CLK-CYC produce two other proteins, PERIOD and TIME (PER-TIM). PERTIM has the effect of rendering the CLK-CYC proteins inactive, so that, as PERTIM increases, CLK-CYC decreases and therefore PER-TIM starts to decrease too (negative feedback). This loop takes about 24 hours and, hey presto, y ...
... joined, CLK-CYC produce two other proteins, PERIOD and TIME (PER-TIM). PERTIM has the effect of rendering the CLK-CYC proteins inactive, so that, as PERTIM increases, CLK-CYC decreases and therefore PER-TIM starts to decrease too (negative feedback). This loop takes about 24 hours and, hey presto, y ...
J.H. Meijer, S. Michel, M.J. Vansteensel
... and a bright night. Instead, the cells are equipped to differentiate only between day and night. The large range of illumination levels in the environment is translated into an electrical activity signal, indicating light intensities occurring around dawn and dusk. The intensity–response function is ...
... and a bright night. Instead, the cells are equipped to differentiate only between day and night. The large range of illumination levels in the environment is translated into an electrical activity signal, indicating light intensities occurring around dawn and dusk. The intensity–response function is ...
Entrainment of the Fetal Circadian Clock by Temperature Cycles
... Fig. 6. The small circles and triangles indicate the 6ming of fetal SCN rhythms rela6ve to temperature cycles experienced in vitro. During the cycles, temperature was high at night (8PM to 8AM) or during the day (8AM to 8PM). Each symbol represents the 6ming for a single fetal SCN. A strong tem ...
... Fig. 6. The small circles and triangles indicate the 6ming of fetal SCN rhythms rela6ve to temperature cycles experienced in vitro. During the cycles, temperature was high at night (8PM to 8AM) or during the day (8AM to 8PM). Each symbol represents the 6ming for a single fetal SCN. A strong tem ...