Search Results
Results 201 - 250 of 645
< 1 2 3 4 5 6 7 8 9 10 >
Pizzo Matthew J - - 2002
Ordinal, interval, and circadian mechanisms of solving a time-place task were tested. Rats searched for food twice in the morning and once in the afternoon (Group AB-C, n = 5) or once in the morning and twice in the afternoon (Group A-BC, n = 5) in a box with four ...
Coutureau E - - 2002
Neural manipulations were used to examine the mechanisms that underlie the acquired equivalence and distinctiveness of cues in rats. Control rats and those with excitotoxic lesions of either the hippocampus (HPC) or entorhinal cortex (EC) acquired the following conditional discrimination: In Contexts A and B, Stimulus X-->food and Stimulus Y-->no ...
Thorpe Christina - - 2002
This experiment examined the effect of medial prefrontal lesions on time-place learning in the rat. During the first phase, prior to lesioning, rats received training on an interval time-place task. Food was available on each of four levers for 3 consecutive min of a 12-min session. The levers provided food ...
Sako Noritaka - - 2002
To examine the importance of the hardness of foods, we conducted behavioral and electromyographical experiments in Wistar male rats using three kinds of pellets, a hard commercially made pellet (MF), a hard privately produced pellet (H) and a soft privately produced pellet (S). MF and H had the same hardness ...
Salinas Juan A JA Department of Psychology, University of Texas at Austin, Austin, TX 78712, USA. - - 2002
Male Fischer 344 rats received chronic exposure to either water containing 250 ppm lead or tap water. On the first day of the study, rats were allowed to habituate to a 1-m(2) open field arena with a rectilinear grid pattern of food wells on the floor for a 2-min session. ...
Grasmuck V - - 2002
Previous studies have shown that a behavioural differentiation appeared in groups of rats subjected to an experimental design in which access to the feeder was made difficult. Some rats brought back food pellets to the cage (divers) while the others (non-divers) stayed in the sole home cage and obtained food ...
Holland Peter C - - 2002
Both control rats and rats with neurotoxic lesions of the amygdala central nucleus ate more food during presentations of a conditioned stimulus (CS) previously paired with food than during an unpaired CS. This potentiation occurred regardless of whether the food was presented in its usual place or in a different ...
Seto Yasuyuki - - 2002
BACKGROUND/AIMS: The nutritional effects of pouch replacement after total gastrectomy remain clinically controversial. Two previous experiments failed to show any nutritional benefit. However, the pouches applied clinically and examined experimentally so far were all of anti-peristaltic type. METHODOLOGY: Male 7- or 8-week-old Wistar rats were divided into 3 experimental groups ...
Pal G K - - 2002
Twenty-four hour basal food and water intakes were recorded in Wistar rats. Diabetes was produced in a group of rats by injecting streptozotocin (STZ, 75 mg/kg, b.w., IP) and their post-diabetic basal food and water intakes were recorded. Noradrenaline (2 microg) and dopamine (2 microg) were injected separately into the ...
Marzo F - - 2002
The influence of extrusion cooking on the protein content, amino acid profile, and concentration of antinutritive compounds (phytic acid, condensed tannins, polyphenols, trypsin, chymotrypsin, alpha-amylase inhibitors, and hemagglutinating activity) in kidney bean seeds (Phaseolus vulgaris L. var. Pinto) was investigated. Growing male rats were fed diets based on casein containing ...
Parker Graham C - - 2002
We have recently reported that bilateral infusions of the 5-HT receptor antagonist metergoline (MET) into the posterior basolateral amygdala (pBLA) elicit feeding in female rats tested at mid-light cycle. The present study was performed to determine whether (1) testing at two different phases of the estrous cycle, and/or (2) the ...
Oddie Scott D - - 2002
It is well known that damage to the hippocampal formation (Ammon's horn, dentate gyrus, fimbria-fornix, and other pathways) produces impairments in spatial navigation and in certain forms of learning. Lesions within these structures have also been reported to produce some motor impairments, but the nature of these impairments is less ...
Abiko T - - 2002
To examine the roles of aromatic rings, Tyr residues at positions 1 and 5 and Phe residues at positions 16, 17, and 19 of rat neuromedin U-23 (NMU-23) (Tyr-Lys-Val-Asn-Glu-Tyr-Gln-Gly-Pro-Val-Ala-Pro-Ser-Gly-Gly-Phe-Phe-Leu-Phe-Arg-Pro-Arg-Asn-NH2) for reducing food intake activity in male Wistar rats, two NMU-23 analogues, [Phe(4F)16,17,19] NMU-23 and [Tyr(Me)1,6]NMU-23, were synthesized by Fmoc strategy ...
Tuohy K - - 2002
AIMS: The generation of data of real relevance to the purported risks of DNA transfer from food-borne genetically modified microorganisms (GMMOs) using the human biota associated (HBA) rat model. Plasmid transfer between Lactococcus lactis strains and between donor strains and human gut bacteria was monitored. METHODS AND RESULTS: Transfer of ...
Norese María F - - 2002
The anorexic effect of exposure to high altitude may be related to the reduction in the arterial oxygen content (Ca(O2)) induced by hypoxemia and possibly the associated decreased convective oxygen transport (COT). This study was then performed to evaluate the effects of either transfusion-induced polycythemia or previous acclimation to hypobaria ...
Brown M F - - 2001
Rats searched in a matrix of vertical poles for food hidden on top of the poles. The only information available about the location of the food was the consistent spatial pattern of the baited poles, which was a checkerboard. This spatial pattern of hidden-food locations came to control the choices ...
Boileau T W - - 2001
We previously demonstrated that the castration of male rats profoundly increases hepatic lycopene compared with intact controls. Here we further characterized the role of testosterone in modulating hepatic lycopene accumulation and isomer patterns in male rats. Furthermore, because castration significantly decreases ad libitum food consumption, we investigated the influence of ...
Abiko T - - 2001
A nonapeptide, H-Asn-Gln-Trp-Ala-Val-Gly-His-Leu-Met-NH2, corresponding to amino acids 6 to 14 of bombesin and its four analogues were synthesized by a solid-phase method and were tested for their comparative effect on reducing activity on food intake using male Wistar rats. The synthetic bombesin-fragment6-14 showed reducing effect on food intake using male ...
Rollins B L - - 2001
Female rats with posterodorsal amygdala (PDA), basolateral amygdala (BLA), or sham lesions were compared regarding ad libitum food intake, weight gain, consumption of a novel food, and acquisition of a conditioned taste aversion (CTA). While only the rats with PDA lesions evidenced substantial weight gains at 10 days after surgery ...
Starbuck E M - - 2001
A lesion of the subfornical organ (SFO) may disrupt drinking after a meal of dry chow as it does drinking after intragastric administration of hypertonic saline. Food and water intakes of SFO-lesioned (SFOX) and sham-lesioned rats were measured during 90-min tests following various lengths of food deprivation. During the tests, ...
Galef B G BG - - 2001
Six experiments were undertaken to explore factors affecting young rats' (Rattus norvegicus) frequencies of stealing food from conspecifics when identical food is available in surplus. It was found that (a) rats would walk across a bed of pellets to steal the particular pellet a peer was eating, (b) frequency of ...
Metz G A - - 2000
Many animals in different mammalian orders display skilled forelimb use for prehension, but there has been little study of the rules underlying skilled forelimb use that may provide insight into its neural organization. Inflexibility of movement would imply an underlying fixed neural control characteristic of innate action pattern, whereas flexibility ...
Giorgetti M - - 2000
The effects of protracted cocaine administration (15 mg/kg i.p., twice a day for 9 days) on the circadian pattern of feeding behavior was studied in individually housed male Sprague-Dawley rats, maintained under a 12:12 light:dark cycle. Water and food were available ad libitum and food intake was measured twice a ...
Ganaraja B - - 2000
Amygdaloid nuclei and the hypothalamic structures are known to have intimate functional relationships. But to date the nature of this relationship has not been completely understood. In the present study, this relationship was evaluated. Lesions were performed in basolateral nucleus of amygdala (BLA) and the ventromedial hypothalamus (VMH) in the ...
Ronca A E - - 2000
In the present study, we analyzed the relationship between body mass, food and water intake, and behavioral activity in pregnant and lactating rat dams exposed to continuous, 1.5-g centrifugation for 32 days. The period of centrifugation spanned from Gestational day (G) 11 of the rats' 22-day pregnancy until Postnatal day ...
Galef B G BG - - 2000
A naive observer Norway rat offered a choice between two foods, after it interacts with a demonstrator rat fed one of those foods, increases its preference for whichever food the demonstrator rat ate. It is not known whether interaction with a demonstrator rat would also increase the amount that an ...
Casas M - - 2000
This study investigated whether methylxanthines (caffeine and theophylline) would restore food and water intake in rats made aphagic and adipsic by bilateral 6-hydroxydopamine lesions of the nigrostriatal bundle, and these results were compared with the effects of d-amphetamine, the dopamine D(1) agonist SKF 38393, and the D(2/3) agonist quinpirole. In ...
Davidson A J - - 2000
Rats anticipate daily restricted meals with increased approaches to a feeder and an increase in core body temperature. Food anticipatory activity (FAA) is thought to be under the control of a feeding-entrained circadian oscillator. Although numerous forebrain lesions have failed to permanently abolish FAA, the hindbrain has not been investigated. ...
Kawagishi H - - 2000
In an experiment in which rats were allowed free access to food and water, the rats did not eat the diet containing a mushroom Pleurotus ostreatus even if they were emaciated. A P. ostreatus lectin (POL) was isolated from the mushroom as the food intake-suppression principle. In hemagglutination inhibition assays, ...
Flo G - - 2000
Simmondsin, 2-(cyanomethylene)-3 hydroxy 4,5 dimethoxy cyclohexyl beta-D-glucoside, from jojoba meal reduces food intake in rats. We investigated the mechanism of action simmondsin, by studying the effects of fasting or of vagotomy on the food intake reduction. The food intake reduction was significantly less in fasted rats than in non-fasted rats. ...
Tuomisto J T - - 2000
Effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on food selection were studied in TCDD-resistant Han/Wistar and TCDD-sensitive Long-Evans rats and their crosses. The rats were offered a selection diet consisting of chocolate, cheese, and chow, and TCDD was given at the same time or 4 or 16 days later. TCDD persistently reduced the ...
Bau H M - - 2000
We briefly reviewed the effects of soybean germination on biologically active components, nutritive value of seed and biological characteristics in rats. The purpose of this review is to evaluate the effects of soybean germination on nutritional values of seeds and the potential importance for the use of germinated soybeans, from ...
Julien N - - 2000
Gentamicin-induced nephrotoxicity varies temporally, with a peak being observed when this antibiotic is administered during the resting period and a trough when given during the activity period of rats. These nychthemeral variations are modified by fasting and by restricted feeding schedules. In this study, food and water intakes of adult ...
Faro C J - - 2000
Our aim was to investigate the cause-effect relationship between intestinal inflammation induced by infection with enteric stages of Trichinella spiralis and decreased host food intake. A suppression of food intake in T. spiralis-infected rats occurred within the first 24 h postinfection (PI) and was maximized by day 6 PI. Food ...
Shibata K - - 2000
L-tryptophan is a very important precursor of niacin in mammals. Food preparation in which proteins are exposed to an alkali and/or high temperature for a long period generate appreciable amounts of D-amino acids from racemization. The efficiency of D-tryptophan as niacin was thus investigated by using weanling rats. The availability ...
Martinková A - - 2000
The day-night variation of food intake and alkaline phosphatase (AP) activity was studied in the duodenum of rats neonatally treated with monosodium glutamate (MSG) and saline-treated (control) rats. The animals were kept under light-dark conditions (light phase from 09:00 h to 21:00 h) with free access to food. AP activity ...
Laviano A - - 2000
BACKGROUND: Tumor growth in animals and humans is associated with the onset of anorexia and reduced food intake. We previously demonstrated that the ventromedial nucleus of hypothalamus (VMN) plays a contributory role in mediating cancer anorexia. Because serotonin and interleukin-1 (IL-1) are putative mediators of cancer anorexia, we hypothesized that ...
Yamanaka A - - 1999
Orexins are recently identified neuropeptides, and have been shown to increase food intake when administered intracerebroventricularly. We examined the effects of chronic administration of orexin in rats by continuous intracerebroventricular administration by means of an osmotic minipump. Continuous administration of orexin-A (0.5 nmol/h) for 7 days in rats resulted in ...
Schultz L A - - 1999
Animals can meet energetic challenges by acquiring or conserving energy. In the present experiment, we pitted these strategies against each other by housing rats in a cold environment and requiring them to bar press for food pellets and for access to a heated nest. Our question was how rats would ...
Heil S H - - 1999
While prolactin (PRL) has been reported to increase food intake by virgin female rats, its effects on food intake by male rats are relatively unexplored. The present studies examined the possibility that PRL has sex-specific effects on food intake by rats. In the first study, intact female and male rats ...
Glass M J - - 1999
We assessed differences in food reinforced behavior between obese and lean Zucker rats with a progressive ratio schedule 3 (PR3) in which a subject emitted three additional lever-presses each time a reinforcer was delivered. The number of responses required for a reinforcer eventually exceeded its value, termed the "break point", ...
Dringenberg H C - - 1998
Unlesioned rats exploring a black-white two compartment box spent most of the time in the covered, black half of the box and only little time in the uncovered, white half (67 s/5 min). Large radio-frequency lesions of the amygdala or hippocampus did not alter this pattern of exploration, but rats ...
Shibasaki T - - 1998
The effects of fasting, restraint stress, and intracerebroventricular (i.c.v.) injection of somatostatin on the growth hormone secretagogue, KP-102-induced stimulation of food intake were examined in rats. KP-102-induced stimulation of food intake was observed in freely-fed rats but not in 24-h starved rats. A 90 min period of restraint stress decreased ...
Schroeder H - - 1998
The present study was designed to investigate the consequences of a chronic diazepam (DZ) exposure (10 mg/kg/day) during the first 3 weeks of life on social behavior of adult male rats measured in a situation of restricted access to food, the diving-for-food model. The treatment had no long-term effects on ...
Ramaswamy C - - 1998
Adult albino rats of Wistar strain (200 to 250 g) were lesioned at the nucleus accumbens (Acb) either in the shell area (Acbsh) or in the core area (Acbc). The rats were offered a choice of water and 0.2 per cent saccharine or water and 12 per cent sucrose solution. ...
Lee K M - - 1998
The objective of the study reported here was to investigate three factors that may affect the amounts of water consumed and urine excreted by a rat in the metabolism cage: water dilution, housing, and food. Young F344/N rats (eight per group) were used for all experiments. Food was withheld from ...
Davidson A J - - 1998
The feeding-entrained circadian oscillator (FEO) organizes locomotor activity and other variables to anticipate daily timed meals. Whether the biological substrate for the FEO is in the central nervous system or in the periphery, there must be communication between the gut and the brain to result in a behavioral output. To ...
Levine Seymour - - 1998
Withholding of food overnight has been used for numerous experimental purposes, including to reduce errors of intraperitoneal injections by diminishing the size and weight of the gastrointestinal tract, to prepare for gavage or surgery, or to avoid the effects food in the gastrointestinal tract might exert on drugs or nutrients. ...
Ghiani C A - - 1998
Changes in the extracellular concentration of acetylcholine (ACh) were evaluated in the prefrontal cortex and hippocampus of freely moving rats habituated for 35 days to consume their daily meal during a fixed 2-h period. During the 40 min immediately before presentation, ACh output increased by 49 and 55% in the ...
Wan H Z - - 1998
The GLUT2 glucose transporter, which may play a glucose-sensing role in hepatocyte and islet beta cells because of its low affinity and high Km for glucose, has been identified in some discrete brain areas that are related to feeding behavior and energy metabolism. We tested the hypothesis that brain GLUT2 ...
< 1 2 3 4 5 6 7 8 9 10 >