Bora D. Zivkovic

Works (5)

Updated: July 5th, 2023 16:02

2003 article

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

Steele, C. T., Zivkovic, B. D., Siopes, T., & Underwood, H. (2003, January 1). American Journal of Physiology-Regulatory, Integrative and Comparative Physiology.

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
topics (OpenAlex): Circadian rhythm and melatonin; Photoreceptor and optogenetics research; Neurobiology and Insect Physiology Research
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)
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Source: Web Of Science
Added: August 6, 2018

2001 article

Circadian organization and the role of the pineal in birds

Underwood, H., Steele, C. T., & Zivkovic, B. (2001, March 23). Microscopy Research and Technique.

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
topics (OpenAlex): Circadian rhythm and melatonin; Neurobiology and Insect Physiology Research; Photoreceptor and optogenetics research
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)
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Source: Web Of Science
Added: August 6, 2018

2000 article

Circadian Ovulatory Rhythms in Japanese Quail: Role of Ocular and Extraocular Pacemakers

Zivkovic, B. D., Underwood, H., & Siopes, T. (2000, April 1). Journal of Biological Rhythms.

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
topics (OpenAlex): Circadian rhythm and melatonin; Neurobiology and Insect Physiology Research; Plant and animal studies
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)
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Source: Web Of Science
Added: August 6, 2018

1999 article

Effects of Fasting on the Circadian Body Temperature Rhythm of Japanese Quail

Underwood, H., Steele, C. T., & Zivkovic, B. (1999, March 1). Physiology & Behavior.

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
topics (OpenAlex): Circadian rhythm and melatonin; Animal Nutrition and Physiology; Neurobiology and Insect Physiology Research
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)
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Source: Web Of Science
Added: August 6, 2018

1999 article

Formal Properties of the Circadian and Photoperiodic Systems of Japanese Quail: Phase Response Curve and Effects of T-Cycles

Zivkovic, B. D., Underwood, H., Steele, C. T., & Edmonds, K. (1999, October 1). Journal of Biological Rhythms.

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

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
topics (OpenAlex): Circadian rhythm and melatonin; Plant and animal studies; Neurobiology and Insect Physiology Research
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)
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Source: Web Of Science
Added: August 6, 2018

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