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At least 1,135 records · Page 63Linked to original sources
PubMed1997

[Resistance to hunger as an element of the adaptive strategy of malaria mosquito larva].

Mortality from starvation in larvae of malaria mosquito species Anopheles beklemishevi, A. messeae, and A. sinensis (Diptera, Culicidae) was compared. The results showed that the southern species. A. sinensis is more resistant to starvation and more competitive than A. messeae, the species with chromosome polymorphism. Mortality of larvae increased when they starved in groups. Starving A. messeae larvae with "southern" inversions (K-strategists) proved to be more viable than larvae with "northern" karyotypes (r-strategists). The relationship between resistance to starvation and selection strategies in malaria mosquito populations is discussed.

Adaptation, Physiological↗
PubMed1992

Schizophrenia after prenatal exposure to the Dutch Hunger Winter of 1944-1945.

We tested the hypothesis that first-trimester exposure to acute food deprivation is a risk factor for schizophrenia. A sharp and time-limited decline in the food intake of the Dutch population following a Nazi blockade in 1944 to 1945 created a unique if tragic natural experiment to test this hypothesis in three regions of Holland (west, north, and south). In the west, or famine region, birth cohorts exposed to severe food deprivation (an average daily ration under 4200 kJ) during the first trimester showed a substantial increase in hospitalized schizophrenia for women but not for men. Relative risks for women were 2.17 for "broad" and 2.56 for "restricted" schizophrenia. Moderate food deprivation during the first trimester (average daily ration under 6300 kJ) was not associated with increased risk of schizophrenia in the famine region. In the north and south regions, numbers were smaller and there was no exposure to severe famine. Birth cohorts exposed to moderate food deprivation during the first trimester showed a trend toward increased risk of schizophrenia for women. These findings give plausibility to the proposition that early prenatal nutrition can have a gender-specific effect on the risk of schizophrenia.

Female↗
PubMed2005

Ontogeny of urine preference and its relationship to NH4Cl preference and sodium hunger in suckling rat pups.

We chart the postnatal ontogeny of urine preference in the suckling rat. Twelve-day-old sucklings, when offered urine, NH4Cl, or NaCl, ingest more urine and NH4Cl than NaCl. When rendered sodium hungry by ivc renin or by sodium depletion, these sucklings prefer urine and NH4Cl to NaCl, dilute urine, or an NaCl and KCl mineral mix equimolar to urine; however, by 18 days of age, urine and NH4Cl are no longer preferred to NaCl. Hence, urine preference in the suckling may be specific and preparatory for the variety of purposes urine preference serves in the adult rat, and it might guide the pup to urinary sodium in the nest. Since preference for urine and NH4Cl covary during postnatal development, the high preference for NH4Cl in midterm sucklings might be because its ammonium flavor is similar to urine.

Ammonium Chloride↗
PubMed2004

Father hunger and narcissistic deformation.

The author advances the hypothesis that paternal availability and the relationship between the mother and father are crucial components of evolving character structure in children. He proposes that a kind of narcissistic pathology featuring perverse sexuality may eventuate in the absence of paternal availability and in the presence of a disordered relationship between the parents. He also suggests that the ways in which aggression is or is not modulated and organized are crucial components of this evolving disorder, and that boys are more susceptible to its full manifestation and expression than are girls.

Adolescent↗
PubMed1999

The effects of hunger on locomotory behaviour in two species of wolf spider (Araneae, Lycosidae).

We compared the influence of recent feeding history on locomotory behaviour in two species of wolf spiders, Hogna helluo (Walckenaer) and Pardosa milvina Hentz, in the laboratory. Both species are cursorial hunters. We maintained the spiders in the laboratory on satiation and stringent feeding regimes and measured their locomotory activity levels for 1 h using a digital activity recording device. We subjected H. helluo to either ad libitum feeding for 14 days or no food for 14 days. We subjected P. milvina to ad libitum feeding or fasting treatments for 7 and 14 days. We found that H. helluo showed a shift in locomotory activity depending on feeding regime, whereas P. milvina did not. Food-limited H. helluo travelled further than satiated H. helluo, and did so by moving more frequently. Pardosa milvina was in general much more active than H. helluo. We propose that P. milvina is an active forager compared with the sit-and-wait strategy of H. helluo. This difference in foraging strategy is correlated with differences in body size and habitat use. Copyright 1999 The Association for the Study of Animal Behaviour.

Journal Article↗
PubMed1975

The effect of hunger on free fatty acid and corticosterone plasma levels in rats.

The time function of free fatty acids and of corticosterone in plasma in fed and fasted rats was investigated. Also a study of the influence of hypoxia on the concentration of plasma free fatty acids was carried out. Whereas fasting does not seem to stimulate lipolysis markedly before 12 h, 2 h of hypoxia elevate the free fatty acid level to its maximum. In the fasted condition, all values are significantly higher than corticosterone in the fed animal.

Animals↗
PubMed2003

Increases in food intake or food-seeking behavior induced by GABAergic, opioid, or dopaminergic stimulation of the nucleus accumbens: is it hunger?

RATIONALE: Previous work has shown that stimulation of GABAergic, opioid, or dopaminergic systems within the nucleus accumbens modulates food intake and food-seeking behavior. However, it is not known whether such stimulation mimics a motivational state of food deprivation that commonly enables animals to learn a new operant response to obtain food. OBJECTIVES: In order to address this question, acquisition of lever pressing for food in hungry animals was compared with acquisition in non-food-deprived rats subjected to various nucleus accumbens drug treatments. METHODS: All animals were given the opportunity to learn an instrumental response (a lever press) to obtain a food pellet. Prior to training, ad lib-fed rats were infused with the gamma-aminobutyric acid (GABA)A agonist muscimol (100 ng/0.5 microl per side) or the mu-opioid receptor agonist D-Ala2, N-me-Phe4, Gly-ol5-enkephalin (DAMGO, 0.25 microg/0.5 microl per side), or saline into the nucleus accumbens shell (AcbSh). The indirect dopamine agonist amphetamine (10 microg/0.5 microl per side) was infused into the AcbSh or nucleus accumbens core (AcbC) of ad lib-fed rats. An additional group was food deprived and infused with saline in the AcbSh. Chow and sugar pellet intake responses after drug treatments were also evaluated in free-feeding tests. RESULTS: Muscimol, DAMGO, or amphetamine did not facilitate acquisition of lever pressing for food, despite clearly increasing food intake in free-feeding tests. In contrast, food-deprived animals rapidly learned the task. CONCLUSIONS: These findings suggest that pharmacological stimulation of any of these neurochemical systems in isolation is insufficient to enable acquisition of a food-reinforced operant task. Thus, these selective processes, while likely involved in control of food intake and food-seeking behavior, appear unable to recapitulate the conditions necessary to mimic the state of negative energy balance.

Amphetamine↗