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You searched for subject:(chemoreceptoren). Showing records 1 – 2 of 2 total matches.

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1. Ma, W.C. Dynamics of feeding responses in Pieris brassicae Linn. as a function of chemosensory input : a behavioural, ultrastructural and electrophysiological study.

Degree: 1972, Landbouwhogeschool Wageningen

<p/>The present study of contact chemoreception in Pieris brassicae L. is divided into three major parts, viz. 1. behavioural analyses, 2. the identification and description of sense organs and 3. investigations concerning the sensory physiology. In a separate section some of the results were put into a coherent discussion.<p/>In the behavioural studies the food selection behaviour was investigated as well as the behavioural responses to single or combined chemical stimuli (Chapter 3 and 4). It was found that the preference order for certain food plants can be strongly influenced by previous experience. Herein the time of experience, the species of food plant concerned and the choice-situation itself are playing an important rôle. The various experiments indicated that modifications in preferences were related to learning processes rather than to changes in the physiology of the relevant sense organs. In extirpation experiments it was found that the very subtle discriminative capacity and the possibility to induce preference modification remain unaffected by bilateral maxillectomy.<p/>With respect to the above phenomenon the studies of the behaviour to chemical stimuli were performed with larvae reared on a meridic diet. The food intake behaviour of the larvae on this diet was used for deriving several response parameters, among which were frequency and time intervals of mouth part movement and measurement of quantities of food ingested. Only sucrose and D-glucose appeared to be able to induce an actual food ingestion. Fructose and other mono-, di- or trisaccharides were completely ineffective. From the stimulus- response relationships investigated it was deduced that sucrose is a much more effective stimulus than glucose. The relationship between stimulus intensity and behavioural response was also studied in relation to starvation of the experimental animals.<p/>Other types of chemical stimuli, such as mustard oil glucosides, amino acids, salts and ascorbic acid are unable to induce food intake but show a positive interaction when mixed sub-optimally stimulating concentrations of sucrose. It was found that the stimulus-response relationships established for mustard oil glucosides differed in an essential way from those established for the remaining compounds. Several indications were found that the maxillary palpi exert an endogenous inhibiting effect on the onset of food intake.<p/>The larvae demonstrated a high sensitivity to alkaloids and steroids which inhibited food intake. For these inhibitors the relationships between stimulus intensity and behavioural response were quantitatively analysed in relation to different types of feeding substrates. In ablation experiments it was found that bilateral maxillectomy or galeaectomy resulted in a loss of responsiveness to mustard oil glucosides. However, this was not the case after bilateral palpectomy. The sensitivity to sucrose, glucose, alkaloids or steroids was not affected by bilateral… Advisors/Committee Members: J. de Wilde.

Subjects/Keywords: diergedrag; dierfysiologie; ecologie; gewoonten; Lepidoptera; rhopalocera; chemoreceptoren; Fysiologische entomologie; animal behaviour; animal physiology; ecology; habits; Lepidoptera; rhopalocera; chemoreceptors; Physiological Entomology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ma, W. C. (1972). Dynamics of feeding responses in Pieris brassicae Linn. as a function of chemosensory input : a behavioural, ultrastructural and electrophysiological study. (Doctoral Dissertation). Landbouwhogeschool Wageningen. Retrieved from http://library.wur.nl/WebQuery/wurpubs/421851 ; urn:nbn:nl:ui:32-421851 ; urn:nbn:nl:ui:32-421851 ; http://library.wur.nl/WebQuery/wurpubs/421851

Chicago Manual of Style (16th Edition):

Ma, W C. “Dynamics of feeding responses in Pieris brassicae Linn. as a function of chemosensory input : a behavioural, ultrastructural and electrophysiological study.” 1972. Doctoral Dissertation, Landbouwhogeschool Wageningen. Accessed July 21, 2019. http://library.wur.nl/WebQuery/wurpubs/421851 ; urn:nbn:nl:ui:32-421851 ; urn:nbn:nl:ui:32-421851 ; http://library.wur.nl/WebQuery/wurpubs/421851.

MLA Handbook (7th Edition):

Ma, W C. “Dynamics of feeding responses in Pieris brassicae Linn. as a function of chemosensory input : a behavioural, ultrastructural and electrophysiological study.” 1972. Web. 21 Jul 2019.

Vancouver:

Ma WC. Dynamics of feeding responses in Pieris brassicae Linn. as a function of chemosensory input : a behavioural, ultrastructural and electrophysiological study. [Internet] [Doctoral dissertation]. Landbouwhogeschool Wageningen; 1972. [cited 2019 Jul 21]. Available from: http://library.wur.nl/WebQuery/wurpubs/421851 ; urn:nbn:nl:ui:32-421851 ; urn:nbn:nl:ui:32-421851 ; http://library.wur.nl/WebQuery/wurpubs/421851.

Council of Science Editors:

Ma WC. Dynamics of feeding responses in Pieris brassicae Linn. as a function of chemosensory input : a behavioural, ultrastructural and electrophysiological study. [Doctoral Dissertation]. Landbouwhogeschool Wageningen; 1972. Available from: http://library.wur.nl/WebQuery/wurpubs/421851 ; urn:nbn:nl:ui:32-421851 ; urn:nbn:nl:ui:32-421851 ; http://library.wur.nl/WebQuery/wurpubs/421851

2. Besselink, H. Molecular and biochemical studies on the Ah receptor pathway in flounder (Platichthys flesus).

Degree: 1998, Agricultural University

The research presented in this thesis focused on the mechanistic aspects of the toxic and biochemical effects of PCBs in flounder (Platichthys flesus), with the aim to provide a scientific basis for the suggested involvement of PCBs in the aetiology of diseases observed in flounder. Therefore, the first goal was to study the biochemical effects of PCBs in flounder by investigating the inducibility of cytochrome P4501A and associated EROD activity and glutathione-S-transferase activity upon administration to PCBs and TCDD in vivo. Secondly, the mechanism of action of PCBs in flounder was investigated by identifyingg the hepatic microsomal Ali receptor pathway. In addition, the potency of individual PCB congeners and a commercial PCB mixture to specifically inhibit the catalytic CYP1A activity was studied using in vitro techniques. Finally, the endocrine disrupting effect of PCBs was studied by analysing the retinoid and thyroid hormone levels in flounder after acute and chronic exposure to either a commercial PCB mixture or contaminated harbour sludge. summary of results Short-time exposure of flounder to the technical PCB mixture Clophen A50 showed minor effects on total hepatic cytochrome P450 concentrations and only a relatively slight induction in EROD activity, indicating that flounder is not very sensitive towards i.p. and oral administration of Clophen A50 ( <strong>chapter</strong> 3 and 5). The most potent PCB congener (CB-126), in terms of mammalian derived TCDD toxic equivalents (TEQ), was found to be more potent as inducer of CYP1A protein and activity in flounder, but not to the extend as was expected based on TCDD TEQs ( <strong>chapter</strong> 5). On the other hand, high induction of the hepatic microsomal CYP1A content and associated EROD activity were observed in flounder orally exposed to TCDD ( <strong>chapter</strong> 4). Interestingly, TCDD induced EROD activity in flounder could be inhibited by co-treatment with Clophen A50. In contrast, administration of flounder with a combination of TCDD and CB-126 resulted in an additive effect on EROD activity ( <strong>chapter</strong> 5). With respect to induction of hepatic CYP1A protein content, administration of combinations of both Clophen A50 and CB-126 with TCDD resulted in an additive effect compared to exposure of flounder to the individual compounds. These results indicated a direct inhibition of CYP1A catalytic activity by residual PCBs present in the microsomal suspension, rather than inhibition of transcription of the CYP1A gene or translation of CYP1A mRNA. Evidence for direct inhibition of EROD activity by individual PCB congeners and the technical PCB mixture Clophen A50 is presented in <strong>chapter</strong> 6. The relative sensitivity of flounder towards TCDD exposure was established by comparing the flounder computed no effect level (CNEL) for EROD activity to -lowest observed -adverse - effect levels (LOAELs) from other… Advisors/Committee Members: J.H. Koeman, A. Brouwer.

Subjects/Keywords: visziekten; polycyclische koolwaterstoffen; werkwijze; polychloorbifenylen; chemoreceptoren; platichthys flesus; bot (vissen); metabolisme; retinoïden; cytochroom p-450; Milieutoxicologie, ecotoxicologie; fish diseases; polycyclic hydrocarbons; mode of action; polychlorinated biphenyls; chemoreceptors; platichthys flesus; flounder; metabolism; retinoids; cytochrome p-450; Environmental Toxicology, Ecotoxicology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Besselink, H. (1998). Molecular and biochemical studies on the Ah receptor pathway in flounder (Platichthys flesus). (Doctoral Dissertation). Agricultural University. Retrieved from http://library.wur.nl/WebQuery/wurpubs/42694 ; urn:nbn:nl:ui:32-42694 ; urn:nbn:nl:ui:32-42694 ; http://library.wur.nl/WebQuery/wurpubs/42694

Chicago Manual of Style (16th Edition):

Besselink, H. “Molecular and biochemical studies on the Ah receptor pathway in flounder (Platichthys flesus).” 1998. Doctoral Dissertation, Agricultural University. Accessed July 21, 2019. http://library.wur.nl/WebQuery/wurpubs/42694 ; urn:nbn:nl:ui:32-42694 ; urn:nbn:nl:ui:32-42694 ; http://library.wur.nl/WebQuery/wurpubs/42694.

MLA Handbook (7th Edition):

Besselink, H. “Molecular and biochemical studies on the Ah receptor pathway in flounder (Platichthys flesus).” 1998. Web. 21 Jul 2019.

Vancouver:

Besselink H. Molecular and biochemical studies on the Ah receptor pathway in flounder (Platichthys flesus). [Internet] [Doctoral dissertation]. Agricultural University; 1998. [cited 2019 Jul 21]. Available from: http://library.wur.nl/WebQuery/wurpubs/42694 ; urn:nbn:nl:ui:32-42694 ; urn:nbn:nl:ui:32-42694 ; http://library.wur.nl/WebQuery/wurpubs/42694.

Council of Science Editors:

Besselink H. Molecular and biochemical studies on the Ah receptor pathway in flounder (Platichthys flesus). [Doctoral Dissertation]. Agricultural University; 1998. Available from: http://library.wur.nl/WebQuery/wurpubs/42694 ; urn:nbn:nl:ui:32-42694 ; urn:nbn:nl:ui:32-42694 ; http://library.wur.nl/WebQuery/wurpubs/42694

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