The circadian rhythm of thermoregulation in Japanese quail: I. Role of the eyes and pineal

H Underwood - Journal of Comparative Physiology A, 1994 - Springer
… The data support the hypothesis that the eyes are the loci of circadian pacemakers in quail
that act, via both neural and hormonal outputs, to preserve the integrity of (self-sustaining or …

[PDF][PDF] Does a biological clock reside in the eye of quail?

H Underwood, T Siopes… - Journal of Biological …, 1988 - journals.sagepub.com
circadian pacemakers, each with an exclusive photic input from one eye, drive the ocular
in the present study would envisage a light-entrainable circadian pacemaker residing …

Melatonin rhythms in quail: regulation by photoperiod and circadian pacemakers

H Underwood, T Siopes - Journal of pineal research, 1985 - Wiley Online Library
… The objectives of the present study were: (1) to examine the pineal, ocular, and blood
melatonin rhythms in Japanese quail (Coturnix coturnix juponica) under both long and short …

[PDF][PDF] The circadian rhythm of thermoregulation in Japanese quail. II. Multioscillator control

H Underwood, K Edmonds - Journal of Biological Rhythms, 1995 - journals.sagepub.com
… This suggests that either the rhythms are all driven by one circadian pacemaker or if more …
mus, and the eyes of nonmammalian vertebrates are sites of circadian clocks, at least in some …

Circadian organization in Japanese quali

H Underwood, T Siopes - Journal of Experimental Zoology, 1984 - Wiley Online Library
… the eyes must act as major components of the quail's circadian … that the eyes play a major
role within the circadian system … circadian pacemakers may reside within the eyes of quail. The …

Melatonin rhythms in the eyes, pineal bodies, and blood of Japanese quail (Coturnix coturnix japonica)

H Underwood, S Binkley, T Siopes, K Mosher - General and comparative …, 1984 - Elsevier
… The diurnal pattern of melatonin in the pineal bodies, eyes, … study with quail clearly show
that both the pineal and the eyes … rhythm in blood melatonin; the eyes contribute about 33% of …

Circadian organization and the role of the pineal in birds

H Underwood, CT Steele… - Microscopy research and …, 2001 - Wiley Online Library
… system; for example, in the house sparrow pacemakers in the pineal … circadian pacemakers
in both the pineal and eyes play a significant role, and in Japanese quail ocular pacemakers

[PDF][PDF] Circadian ovulatory rhythms in Japanese quail: role of ocular and extraocular pacemakers

BD Zivkovic, H Underwood… - Journal of Biological …, 2000 - journals.sagepub.com
… We propose that in the Japanese quail, one functional set of oscillators (ocular pacemakers
along with the subset of central oscillators that they drive) is entrained by the LD cycle, …

[PDF][PDF] Melatonin does not link the eyes to the rest of the circadian system in quail: a neural pathway is involved

H Underwood, RK Barrett… - Journal of Biological …, 1990 - journals.sagepub.com
… Whether or not the eyes are the loci of circadian pacemakers is an important question. A …
a circadian clock is present in the eye of quail. For example, ONX (which deprives the eyes of …

Ocular clocks are tightly coupled and act as pacemakers in the circadian system of Japanese quail

…, T Siopes, H Underwood - American Journal of …, 2003 - journals.physiology.org
… Furthermore, we hypothesized that these ocular clocks are pacemakers because eye … If
the eyes are indeed acting as pacemakers, we predicted that the two ocular pacemakers in an …

[PDF][PDF] The quail's eye: a biological clock

H Underwood, RK Barrett… - Journal of Biological …, 1990 - journals.sagepub.com
eyes themselves may be the site of circadian clocks that act as pacemakers within the quail’s
multioscillator circadian … Removal of these ocular pacemakers, then, would disrupt the rest …

Eye and gonad: role in the dual-oscillator circadian system of female Japanese quail

H Underwood, T Siopes… - American Journal of …, 1997 - journals.physiology.org
… of eye removal or eye patching on the circadian system of quail … that the eyes are the sites
of circadian pacemakers, … that is, the eyes are merely acting as photoreceptors for pacemakers

[PDF][PDF] The circadian rhythm of thermoregulation in Japanese quail: III. Effects of melatonin administration

H Underwood, K Edmonds - Journal of Biological Rhythms, 1995 - journals.sagepub.com
circadian pacemakers in the eyes of Japanese quail are coupled to the rest of the circadian
… body temperature and activity rhythms of quail were tested to determine whether melatonin …

Multiphotoreceptor and multioscillator system in avian circadian organization

T Oishi, M Yamao, C Kondo, Y Haida… - Microscopy …, 2001 - Wiley Online Library
… We demonstrated that this circadian system was still working in quail after ocular … in linking
pacemakers in the eyes to the rest of the circadian system in female quail (Underwood and …

Time keeping by the quail's eye: circadian regulation of melatonin production

CT Steele, G Tosini, T Siopes, H Underwood - General and comparative …, 2006 - Elsevier
… We sought to strengthen the hypothesis that the eyes are the loci of circadian pacemakers,
and that melatonin output is involved, by examining melatonin secretion in cultured quail

Dopamine mediates circadian rhythms of rod–cone dominance in the Japanese quail retina

MK Manglapus, PM Iuvone, H Underwood… - Journal of …, 1999 - Soc Neuroscience
eye with clear silicone to prevent drying (Dow Corning) and inserted a second electrode into
the other eye … synthesis of dopamine is controlled by an endogenous circadian pacemaker. …

Molecular analysis of avian circadian clock genes

T Yoshimura, Y Suzuki, E Makino, T Suzuki… - Molecular brain …, 2000 - Elsevier
… Here, we report Clock and Period homologs in Japanese quail which offer a new step for …
of circadian rhythms in female quail. Underwood et al. have demonstrated that eye patching in …

The circadian nature of melatonin secretion in Japanese quail (Coturnix coturnix japonica)

V Kumar, BK Follett - Journal of pineal research, 1993 - Wiley Online Library
… of circadian and photoperiodic systems [Underwood and … from both the pineal and the eyes,
the former accounting for … and to entraining effects on circadian pacemaker(s) regulating its …

Retinally perceived light can entrain the pineal melatonin rhythm in Japanese quail

RK Barrett, H Underwood - Brain research, 1991 - Elsevier
… as a pacemaker within a multiosciUator circadian system. … eye of the Japanese quail contains
a circadian clock that is capable of driving the OMR, and probably other rhythms in the eye

Pineal melatonin secretion, but not ocular melatonin secretion, is sufficient to maintain normal immune responses in Japanese quail (Coturnix coturnix japonica)

…, TD Siopes, CT Steele, H Underwood - General and comparative …, 2002 - Elsevier
… the present study, could have modified a diurnal rhythm of immunity. However, … circadian
rhythms in Japanese quail, such as those of locomotor activity or body temperature (Underwood