... kg −1 ) in alligators. Doxapram is used clinically to alleviate ventilatory depression in response to anaesthesia and acts primarily on the peripheral oxygen-sensitive chemoreceptors. Using this approach, we investigated the hypothesis that pulmonary ventilation is relatively modest in comparison...

... of endogenous NO production using l -NAME suppressed the hypoventilatory response to hyperoxia, supporting an inhibitory role of NO in adult zebrafish. Neuroepithelial cells (NECs), the putative oxygen chemoreceptors of fish, contain neuronal nitric oxide synthase (nNOS). In zebrafish larvae at 4 days post...

..., and by morphological changes at the chemoreceptor level. Mangrove rivulus ( Kryptolebias marmoratus ) were exposed to 1 week of normocapnic control water (pH 8), air, hypercapnia (5% CO 2 , pH 6.8) or isocapnic acidosis (pH 6.8). We found that the density of CO 2 /H + chemoreceptive neuroepithelial cells (NECs...

... rise to air breathing in vertebrates. The neural substrate of this behaviour, however, is not defined. We characterized ASR in developing and adult zebrafish ( Danio rerio ) to ascertain a potential role for peripheral chemoreceptors in initiation or modulation of this response. Adult zebrafish exposed...

.... * Author for correspondence ( [email protected] ) 30 8 2012 6 11 2012 © 2013. Published by The Company of Biologists Ltd 2013 5-HT ACh hypoxia zebrafish chemoreceptor NEC Respiratory chemoreceptors are specialized cells that detect changes in the partial pressure...

...Maria L. Coccimiglio; Michael G. Jonz SUMMARY In teleost fish, O 2 chemoreceptors of the gills (neuroepithelial cells or NECs) initiate cardiorespiratory reflexes during hypoxia. In developing zebrafish, hyperventilatory and behavioural responses to hypoxia are observed before development of gill...

... conclusion is that the ribbed hairs are chemoreceptors, not spigots. Observations of live tarantulas clinging inverted to glass coverslips confirmed that some substance is produced by the ribbed hairs, but it remains unclear whether this secretion is actually silk. In any case, the thousands of adhesive...

... predator, Thalassoma bifasciatum ,suggesting that zebrafish can recognize deterrent compounds relevant to coral reef systems. Transcripts made from a zebrafish cDNA library were expressed in a heterologous system, Xenopus laevis oocytes, and tested for chemoreceptor activation via electrophysiology, using...

...Meg E. Johnson; Jelle Atema SUMMARY Individual recognition in the lobster Homarus americanus (Milne-Edwards), is based on detection of urine pheromones via chemoreceptors of the lateral antennular flagellum. The specific sensory pathway mediating this recognition is not known. Most...

...L. Sundin; J. Turesson; E. W. Taylor SUMMARY Glutamate is a major neurotransmitter of chemoreceptor and baroreceptor afferent pathways in mammals and therefore plays a central role in the development of cardiorespiratory reflexes. In fish, the gills are the major sites of these receptors...

...Steve F. Perry; Stephen G. Reid SUMMARY Experiments were performed to test the hypothesis that the marked ventilatory and cardiovascular responses to hypercarbia in rainbow trout Oncorhynchus mykiss arise from specific stimulation of chemoreceptors localised to the first gill arch...

... to examine other sites of putative O 2 -sensitive receptors that could be involved in this reflex action. Superfusion of the exposed brain of decerebrate, spinalectomized fish did not reveal the presence of central chemoreceptors responsive to hyperoxic, hypoxic, hypercarbic,acidic or alkaline solutions...

... in atropinized fish; means ± S.E.M.). Thus, the results of the present study reveal the presence of gill CO 2 chemoreceptors in dogfish that are linked to numerous cardiorespiratory reflexes. In addition, because all cardiorespiratory responses to hypercarbia were abolished or attenuated by atropine, the CO 2...

... %) blood pressures and with a significant bradycardia (approximately 12 %); cardiac output was not significantly affected. To determine the potential roles of internal versus external chemoreceptors in mediating the cardiovascular responses to hypercarbia, experiments were performed to elevate...

...Lena Sundin; Stephen G. Reid; F. Tadeu Rantin; William K. Milsom ABSTRACT This study examined the location and physiological roles of branchial chemoreceptors involved in the cardiorespiratory responses to hypoxia and hypercarbia in a neotropical fish that exhibits aquatic surface respiration...

...Glen M. Watson; David A. Hessinger ABSTRACT Sea anemones capture prey by discharging nematocysts into them. Chemical and mechanical cues identify suitable prey to sensory receptor systems on the anemone. Conjugated N -acetylated sugars from prey bind to chemoreceptors on cnidocyte/supporting cell...

... © 1992 by Company of Biologists 1992 maxillary palp taste chemoreceptor locust Locusta migratoria feeding In recent years it has been demonstrated that at least some insects are able to regulate independently their intake of protein and carbohydrate, both by adjusting...