Browsing by Author "Gündüz, Bülent"
Now showing items 1-20 of 25
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Daily rhythm in serum melatonin and leptin levels in the Syrian hamster (Mesocricetus auratus)
Gündüz, Bülent (Elsevier Science Inc, 2002)Melatonin is produced and secreted by the pineal gland in a rhythmic manner; circulating levels are high at night and low in the day. Leptin is a hormone secreted by adipocytes as a product of the obese gene and plays an ... -
Effect of different photoperiods on gonadal maintenance and development in mongolian gerbils (Meriones unguiculatus)
Karakaş, Alper; Gündüz, Bülent (Zoological Soc Japan, 2002)The role of photoperiod in adult testicular maintenance and body weight and juvenile development was assessed in male Mongolian gerbils (Meriones unguiculatus). Gerbils were raised on a 14L (14 hr of light) photoperiod. ... -
The effect of pinealectomy and leptin hormone on the proliferation and apoptosis activation in Syrian hamster testis in different photoperiods
Gündüz, Bülent; Karakaş, Alper; Terzi, Hakan; Öner, Jale; Serin, Erdinç; Kükner, Aysel (Wiley-Blackwell Publishing, Inc, 2009)P>The effects of pinealectomy and leptin hormone on proliferative and apoptotic processes in the epithelia of testicular seminiferous tubules of Syrian hamsters have been investigated. Proliferative and apoptotic processes ... -
The effect of pinealectomy, melatonin and leptin hormones on ovarian follicular development in female Syrian hamsters (Mesocricetus auratus)
Karakaş, Alper; Kaya, Aliye; Gündüz, Bülent (Akademiai Kiado Zrt, 2010)We studied the effects of melatonin and leptin hormones on ovarian follicular development in intact and pinealectomized female Syrian hamsters. We first monitored the oestrous cycle of the hamsters by the vaginal smear ... -
Effects of European mistletoe (Viscum album L. subsp album) extracts on activity rhythms of the Syrian hamsters (Mesocricetus auratus)
Karakaş, Alper; Türker, Arzu Uçar; Gündüz, Bülent (Taylor & Francis Ltd., 2008)Antitumor drugs may have some significant nervous system side-effects such as disrupted sleep, eating and drinking patterns. European Mistletoe has been investigated for many decades for its potential use against cancer. ... -
The effects of leptin hormone on locomotor activity in Syrian Hamsters (Mesocricetus Auratus)
Gündüz, Bülent; Karakaş, Alper (2011)The suprachiasmatic nucleus (SCN) generates and controls the circadian rhythms in mammals including the rhythm of locomotor activity. Leptin is a hormone secreted by adipose tissue that informs the brain about the fat ... -
The effects of mistletoe (Viscum Album L. Subsp. Album) extracts on isolated intestinal contractions
Throughout history folk medicine has served as an alternative or complimentary method of treating disorders like intestinal colic. Mistletoe is a common name for many species of semi-parasitic plants that grow on trees ... -
The effects of mistletoe (Viscum album L.) extracts on isolated ileum contractions
Serin, Erdinç; Karakaş, Alper; Türker, Arzu; Gündüz, Bülent (Amer Assoc Clinical Chemistry, 2006)European mistletoe (Viscum album L, Loranthaceae) is an evergreen, semiparasitic plant normally found growing on a variety of trees. Both in viva and in vitro studies have shown the cytotoxic, cardiotoxic, immunostimulant, ... -
Effects of photoperiod and food availability on growth, leptin, sexual maturation and maintenance in the Mongolian gerbils (Meriones unguiculatus)
Karakaş, Alper; Çamsarı, Çağrı; Serin, Erdinç; Gündüz, Bülent (Zoological Soc Japan, 2005)Reproductive activity of Mongolian gerbils is regulated by photoperiod nevertheless body weight regulation is controlled without ambient photoperiod. Food intake is a major factor affecting rodent reproductive efficiency. ... -
Effects of photoperiod and melatonin infusions on body weight in pinealectomized juvenile siberian hamsters (Phodopus Sungorus)
Gündüz, Bülent; Karakaş, Alper (2001)We examined the effects of daily melatonin (Mel) infusions in pinealectomized prepubertal male Siberian hamsters in three different conditions. In one study we investigated the body weight maturation response to one hour ... -
Effects of photoperiod and temperature on growth and reproductive organ mass in adult male Mongolian Gerbils, Meriones Unguiculatus
Gündüz, Bülent (2002)Rates of growth and sexual maturation of Mongolian gerbils vary in response to photoperiod. Previous work has shown that the responses of the testes and body weight of juvenile and adult gerbils are influenced not only by ... -
The effects of pinealectomy and melatonin implants on circadian locomotor activity responses of the Mongolian Gerbils exposed to rapid photoperiodic transitions
Gündüz, Bülent; Karakaş, Alper (2010)Jet-lag sendromu ve vardiyalı çalışma rahatsızlığı fotoperiyoddaki hızlı değişimlerden kaynaklanır ve sıklıkla insanların hayatını olumsuz etkilemektedirler. Bu çalışmada jet-lag ve vardiyalı çalışma simüle edilmek istendi. ... -
Effects of pinealectomy and melatonin supplementation on endometrial explants in a rat model
Koç, Önder; Gündüz, Bülent; Topçuoğlu, Ata; Buğdaycı, Güler; Yılmaz, Fahri; Duran, Bülent (Elsevier, 2010)Objective To determine the effects of pinealectomy on endometrial explants in rats and evaluate the activity of superoxide dismutase (SOD) and catalase (CAT) and the levels of malondialdehyde (MDA) in the rat endometriosis ... -
The effects of the intraamygdalar melatonin injections on the anxiety like behavior and the spatial memory performance in male Wistar rats
Karakaş, Alper; Coşkun, Hamit; Kaya, Aliye; Küçük, Ayşegül; Gündüz, Bülent (Elsevier, 2011)In the present study, the effects of intraamygdalar administrations of melatonin (1 and 100 mu g/kg), saline and diazepam on the anxiety-like behavior and spatial memory performance in pinealectomized and sham-pinealectomized ... -
Food restriction affects locomotor activity in Mongolian Gerbils (Meriones Unguiculatus)
Karakaş, Alper; Serin, Erdinç; Gündüz, Bülent (2006)The circadian rhythm of the locomotor activity is regulated by at least 2 external pacemakers, environmental photoperiod and food availability. In the present study, the effects of short-term (2 weeks) food restriction on ... -
Maternal transfer of photoperiodic information in Siberian hamsters. vi. effects of time-dependent 1-hr melatonin infusions in the mother on photoperiod-induced testicular development of her offspring
Gündüz, Bülent; Stetson, Milton H. (Blackwell Munksgaard, 2003)We tested in Siberian hamsters the nature of the maternal signal that relays photoperiodic information to the developing fetuses. As previous investigations have identified maternal hormonal and circadian components in ... -
Maternal transfer of photoperiodic information regulates the postnatal reproductive system development of the Mongolian Gerbil (Meriones Unguiculatus)
Karakaş, Alper; Gündüz, Bülent (2007)We investigated whether photoperiodic information is transferred from mother to young and whether the pineal gland and its hormone, melatonin, are involved in this transfer in Mongolian gerbils. Adult female gerbils were ... -
Melatonin implants have no effect on the testis volume and body weight in Mongolian Gerbils
Karakaş, Alper; Gündüz, Bülent (2003)Mongolian gerbillerin üreme aktivitelerinin düzenlenmesinde fotoperiyot önemli bir faktördür. Fotoperiyodik bilgi en son pineal bez tarafından hormonal sinyale çevrilir. Bu çalışmada uzun fotoperiyotta (14L: 10D) tutulan ... -
The reducing effect of fennel (Foeniculuin vulgaris) extracts on the uterine contractions changes according to the preparation method
Serin, Erdinç; Karakaş, Alper; Türker, Arzu; Gündüz, Bülent (Amer Assoc Clinical Chemistry, 2006)Seeds of fennel are used in folk remedies for treatment of dysmenorrhea. This traditional usage might he related to anti-spasmodic effects of fennel. Menstrual pain that occur in the absence of visihle organic pcKic ongin ... -
Reproductive response of adult Siberian Hamsters to one-hour melatonin infusions
Gündüz, Bülent; Stetson, Milton H. (2003)The pineal hormone melatonin is known to play an important role in mediating photoperiodic messages to the reproductive system in seasonal breeding animals. In this study, we investigated whether a 1 h subcutaneous infusion ...
