Bora D. Zivkovic

Works (5)

Updated: July 5th, 2023 16:02

2003 journal article

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

AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 284(1), R208–R218.

By: C. Steele n, B. Zivkovic n, T. Siopes* & H. Underwood*

author keywords: melatonin; body temperature; eye; circadian; Coturnix
MeSH headings : Animals; Biological Clocks / physiology; Body Temperature; Circadian Rhythm / physiology; Coturnix / physiology; Eye / chemistry; Female; Male; Melatonin / analysis; Melatonin / blood; Ocular Physiological Phenomena; Photoperiod
TL;DR: The ability to maintain phase in DD and rapidly recouple after out-of-phase entrainment demonstrates that the eyes are strongly coupled pacemakers that work in synchrony to drive circadian rhythmicity in Japanese quail. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2001 journal article

Circadian organization and the role of the pineal in birds

MICROSCOPY RESEARCH AND TECHNIQUE, 53(1), 48–62.

By: H. Underwood n, C. Steele n & B. Zivkovic n

author keywords: avian; melatonin; suprachiasmatic nucleus; extraretinal photoreception; ocular pacemaker
MeSH headings : Animals; Biological Clocks / physiology; Birds / anatomy & histology; Birds / physiology; Circadian Rhythm / physiology; Female; Gonadal Steroid Hormones / physiology; Hypothalamus / physiology; Male; Ocular Physiological Phenomena; Photoreceptor Cells, Vertebrate / physiology; Pineal Gland / physiology; Reproduction; Suprachiasmatic Nucleus / physiology
TL;DR: All organisms exhibit significant daily rhythms in a myriad of functions from molecular levels to the level of the whole organism, showing that they are driven by an internal circadian clock. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2000 journal article

Circadian ovulatory rhythms in Japanese quail: Role of ocular and extraocular pacemakers

JOURNAL OF BIOLOGICAL RHYTHMS, 15(2), 172–183.

By: B. Zivkovic*, H. Underwood n & T. Siopes n

author keywords: Japanese quail; circadian; ovulation; internal coincidence; retina; extraretinal photoreception
MeSH headings : Animals; Blindness / physiopathology; Body Temperature; Circadian Rhythm / physiology; Coturnix / physiology; Female; Ocular Physiological Phenomena; Oviposition; Ovulation / physiology; Photoperiod; Photoreceptor Cells, Vertebrate / physiology; Sensory Deprivation / physiology; Vision, Ocular / physiology
TL;DR: The results do not show a role for ocular pacemakers in the control of ovulation, but they do support the hypotheses that entrainment of the central oscillators by extraretinally perceived light is sufficient to preserve a normal ovulatory pattern in LD in the absence of the ocularpacemakers. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

1999 journal article

Effects of fasting on the circadian body temperature rhythm of Japanese quail

PHYSIOLOGY & BEHAVIOR, 66(1), 137–143.

By: H. Underwood n, C. Steele n & B. Zivkovic n

author keywords: circadian; temperature rhythm; fasting; activity rhythm; quail
MeSH headings : Animals; Blindness / physiopathology; Body Temperature / physiology; Circadian Rhythm / physiology; Coturnix / physiology; Fasting / physiology; Female; Photoreceptor Cells / physiology
TL;DR: Measurements of activity levels before and during fasting indicate that fasting-induced hypothermia cannot be explained simply as a consequence of decreases in activity levels, and food deprivation was also observed to cause significant phase shifts in the endogenous rhythm of body temperature. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

1999 journal article

Formal properties of the circadian and photoperiodic systems of Japanese quail: Phase response curve and effects of T-cycles

JOURNAL OF BIOLOGICAL RHYTHMS, 14(5), 378–390.

By: B. Zivkovic n, H. Underwood*, C. Steele n & K. Edmonds n

author keywords: Japanese quail; circadian rhythms; photoperiodism; reproduction; phase response curve; T-cycles
MeSH headings : Animals; Body Temperature / physiology; Circadian Rhythm / physiology; Coturnix / physiology; Female; Motor Activity / physiology; Oviposition / physiology; Ovulation / physiology; Photoperiod; Time Factors
TL;DR: Studies of the circadian and photoperiodic system of Japanese quail showed that the circadian system acts like a low-amplitude oscillator: It is readily reset by light without significant transients, has a Type 0 phase response curve (PRC), and has a large range of entrainment. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

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