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Showing 1 to 20 of 38 for “"chemoreceptors"”.
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Cytoplasmic sensing by Bacillus subtilis chemoreceptors
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Chemoreceptors From the Hawk Moth Manduca Sexta L
… study I cloned and characterized four M. sexta chemoreceptors. Differential screening of a male antennal cDNA library before the publication of the Drosophila melanogaster genome yielded one G coupled-protein receptor that had no matches in Genbank databases and the results of RT-PCR and …
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Characterization of the Chemoreceptors in the Bacillus Subtilis Chemotaxis System
Physical characterization of the chemoreceptors was probed by identification of a zinc ion binding area, using isothermal titration calorimetry. In addition, in vivo chemotactic assays showed that altering the charges of the methylation sites on the chemoreceptors can have a significant effect on …
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Elucidation of the Specificity of S. meliloti Chemoreceptors for Host Derived Attractants
… meliloti, and identification of the bacterium's chemoreceptors that perceive the signals can aid in propagating the symbiosis more efficiently, thus leading to greater crop yields. Investigations here focus on discovering alfalfa derived attractant signals and matching them to their respective …
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Chemoreceptors Regulate Discharge of Microbasic p-mastigophores in the Sea Anemone, AIPTASIA PALLIDA
… (1984, 1988a, b) identified two different chemoreceptors involved in triggering cnida discharge on the tentacles of the sea anemone, Aiptasia pallida. These two classes of receptors were shown to interact with glycine and N-acetylneuraminic acid (NANA). We now show that the discharge of the …
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Molecular evolution of a superfamily of chemoreceptors in Musca domestica and Ceratitis capitata
The house fly (Musca domestica) and the Mediterranean fruit fly (Ceratitis capitata) are two important pest species. While both are generalists, the first is a major vector of a variety of human and livestock disease, while the second is a broadly polyphagous herbivore and important crop pest. Each …
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Neural processing of chemosensory information from the locust legs
Tarsal chemoreceptors in phytophagous insects can provide information on the chemical nature of the leaf surface, and are thus potentially important in host plant discrimination. Ovipositing Pieris brassicae, for example, drum the surface of leaves with their tarsi and tarsal chemoreceptors have …
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Characterization of symbiotically important processes in Sinorhizobium meliloti
… Transcriptional fusions showed that S. meliloti chemoreceptors (MCPs) are class III genes and regulated by FlbT. Quantitative immunoblots determined the cellular amounts of chemoreceptors. Chemoreceptors were grouped in three classes; high, low, and extremely-low abundance, similar to the high …
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Exploring the Structural Dynamics of Bacterial Chemotaxis
… of the chemotaxis pathway are transmembrane chemoreceptors, which bind attractant ligands in the periplasmic domain and transmit ligand occupancy information through the cytoplasmic domain to inhibit a downstream histidine kinase that regulates motor control. Receptors are hypothesized to …
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Similarities and variations of the enterobacterial chemotaxis paradigm in Sinorhizobium meliloti
… data show that the ratio of pentapeptide-bearing chemoreceptors to chemotaxis protein (Che)R and CheB molecules are approximately 500- and 160-fold higher in S. meliloti than in E. coli, respectively. Since not all chemoreceptors in chemotactic bacteria have and utilize the pentapeptide moiety, we …
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Non-canonical sensing mechanisms in bacteria
… the extracellular ligand binding domains of the chemoreceptors are involved in pH sensing. In particular, we identified number of key amino acid residues that define the polarity of pH sensing. We recently found that B. subtilis performs chemotaxis to DNA. While DNA can serve as a nutrient for B. …
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Hypothalamic and medullary modulation of cardiorespiratory responses to hypoxia and hypercapnia
… and may be central hypoxia-sensitive chemoreceptors. A second, distinct population of caudal hypothalamic neurons is inherently responsive to hypercapnia; these neurons may function as traditional central chemoreceptors. Finally, it was found that hypoxia-stimulated, …
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The Roles of Ca2+ and cAMP in the Nematocyst Discharge of the Sea Anemone Tentacle
… by two or more supporting cells that have chemoreceptors and possibly contact-sensitive mechanoreceptors (CSMs). Therefore, the cnidocyte/supporting cell complex (CSCC) controls nematocyst discharge.</p> <p>This project explores the chemoreceptor signaling pathway controlling nematocyst …
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Investigation of the Roles of CheD in the Bacillus Subtilis Chemotactic Signal Transduction
… signals can be sensed by transmembrane chemoreceptors, and then transmitted to the histidine kinase CheA. Once activated, CheA interacts with the response regulator CheY through phosphorelay, which causes a change in the rotation of the flagella. The direction of flagella rotation …
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Sensitivity to chemical stimuli plays a fundamental role in the food preferences. Examples in the evolutionary scale: 1. Role of the walking leg chemoreceptors in the red swamp crayfish Procambarus Clarkii 2. PROP bitter taste sensitivity and its nutritional implications in Humans
… of chemical cues occurs by way of peripheral chemoreceptors grouped within sensory hairs and typically located on the cuticle of cephalothoracic appendages. Antennules and pereopods (walking legs), in particular, have been reported to be olfactory organs involved in a number of behavioral …
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Neural processing of chemosensory information from the locust ovipositor
Contact chemoreceptors (basiconic sensilla) located on the ovipositor and genital segments of the locust serve to control the chemical features of the substrate before and during oviposition. They occur dispersed and also crowded in fields between mechanosensory exteroceptors sensitive to touch or …
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Neurons projecting to the paraventricular nucleus of the hypothalamus are activated and contribute to cardiorespiratory responses to systemic acute hypoxia
Activation of peripheral and central chemoreceptors contributes to homeostatic responses that maintain optimal blood gas levels, including oxygen and carbon dioxide. Brainstem neurons in the nTS and CVLM integrate and modulate chemosensory information and participate in control of cardiorespiratory …
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Cardiovascular and respiratory reflex control systems in the regulation of pulmonary blood flow and ventilation during exercise
… under a background of activated ventilatory chemoreceptors. Finally the effect of increased metabolism on the ventilatory sensitivity to carbon dioxide was investigated in healthy humans. We found that activation of the muscle metaboreflex induced pulmonary vasoconstriction that was …
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The Chemotaxis Phosphatases cheC and cheX
… site for CheD. This sequesters CheD from the chemoreceptors, thus de-exciting them and inducing adaptation of the chemotaxis system.
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Fine structure of the ovipositor and studies of feeding and oviposition site selection by the serpentine leafminer, Liriomyza trifolii (Burgess) (Diptera: Agromyzidae)
… are believed to function as mechano- and chemoreceptors to evaluate the suitability of a host plant for feeding, oviposition, and subsequent larval development. Two greenhouse experiments were conducted to evaluate the effects of photoperiod and application of plant growth regulators on …
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