Results 21 to 30 of about 60,935 (266)
Carotid Body Tumor Resection – A Case Report
Journal of Medical Sciences and Health, 2021 Carotid body tumours (CBT) are considered rare. Surgical excision is the treatment of choice and poses many anaesthetic challenges especially in large tumours.
R Manjula +2 more
doaj +1 more source
Frontiers in Physiology, 2023 An interoceptive homeostatic system monitors levels of CO2/H+ and provides a proportionate drive to respiratory control networks that adjust lung ventilation to maintain physiologically appropriate levels of CO2 and rapidly regulate tissue acid-base ...
Elizabeth C. Gonye, Douglas A. Bayliss
doaj +1 more source
Time-reversal symmetry breaking in the chemosensory array reveals a general mechanism for dissipation-enhanced cooperative sensing. [PDF]
Nat Commun, 2023 The Escherichia coli chemoreceptors form an extensive array that achieves cooperative and adaptive sensing of extracellular signals. The receptors control the activity of histidine kinase CheA, which drives a nonequilibrium phosphorylation-dephosphorylation reaction cycle for response regulator CheY.
Hathcock D, Yu Q, Tu Y.
europepmc +2 more sources
Effect of switching time scale of receptor activity on chemotactic performance of Escherichia coli [PDF]
Indian Journal of Physics, Special Issue: Physical Views of
Cellular processes, Volume 96, Issue 9, Pages 2619-2627 (2022), 2022 In the chemotactic motion of Escherichia coli, the switching of transmembrane chemoreceptors between active and inactive states is one of the most important steps of the signaling pathway. We study the effect of this switching time-scale on the chemotactic performance of the cell.
arxiv +1 more source
Unilateral Carotid Body Tumour: A Case Report [PDF]
Journal of Clinical and Diagnostic Research, 2023 The carotid body, which is located bilaterally on the medial side of the carotid bifurcation, is the largest group of paraganglia in the head and neck.
Shakti Sagar +4 more
doaj +1 more source
Vascular control of the CO2/H+-dependent drive to breathe
eLife, 2020 Respiratory chemoreceptors regulate breathing in response to changes in tissue CO2/H+. Blood flow is a fundamental determinant of tissue CO2/H+, yet little is known regarding how regulation of vascular tone in chemoreceptor regions contributes to ...
Colin M Cleary +5 more
doaj +1 more source
Effect of receptor cooperativity on methylation dynamics in bacterial chemotaxis with weak and strong gradient [PDF]
Physical Review E 105, 014411 (2022), 2022 We study methylation dynamics of the chemoreceptors as an {\sl E.coli} cell moves around in a spatially varying chemo-attractant environment. We consider attractant concentration with strong and weak spatial gradient. During the uphill and downhill motion of the cell along the gradient, we measure the temporal variation of average methylation level of ...
arxiv +1 more source
Interactions of chemostimuli at the single cell level: studies in a model system [PDF]
, 2004 The responses of afferent chemosensory fibres of the carotid body to individual chemostimuli have long been established. However, the mechanisms underlying the multiplicative interactions of these stimuli (i.e.
Peers, C.
core +1 more source
Universal architecture of bacterial chemoreceptor arrays [PDF]
, 2009 Chemoreceptors are key components of the high-performance signal transduction system that controls bacterial chemotaxis. Chemoreceptors are typically localized in a cluster at the cell pole, where interactions among the receptors in the cluster are ...
A. Briegel +42 more
core +3 more sources
Structure and dynamics of the E. coli chemotaxis core signaling complex by cryo-electron tomography and molecular simulations [PDF]
, 2020 To enable the processing of chemical gradients, chemotactic bacteria possess large arrays of transmembrane chemoreceptors, the histidine kinase CheA, and the adaptor protein CheW, organized as coupled core-signaling units (CSU). Despite decades of study,
Cassidy, Keith +8 more
core +1 more source