Results 81 to 90 of about 11,967,962 (263)

Modulation of cerebral blood flow and cognition by hyperthermia and hypoxia: An electroencephalographic event‐related potentials perspective

Experimental Physiology, EarlyView.
Abstract Cerebral blood flow (CBF) is essential for sustaining neuronal metabolism and cognitive performance; however, the precise relationship between perfusion and cognition remains unclear. Although ageing and disease are associated with progressive declines in CBF and cognitive impairment, the acute effects of altered CBF under environmental ...
Hiroki Nakata, Shigehiko Ogoh, Manabu Shibasaki   +2 more
wiley   +1 more source

Time‐course analysis of cerebral circulation and cardiorespiratory responses to acute central blood volume reduction in healthy young males

Experimental Physiology, EarlyView.
Abstract Central blood volume (CBV) reduction challenges circulatory and respiratory homeostasis, particularly during the initial compensatory phase (0–2 min), when rapid physiological adaptations occur. In this study, we examined dynamic cardiorespiratory responses to CBV reduction using lower‐body negative pressure (LBNP) in 11 healthy young males ...
Marina Feeley, Tomoki Watada, Go Ito, Ai Shimada, Toru Sawai, Hideomi Nakata, Shingo Otsuki, Tadayoshi Miyamoto   +7 more
wiley   +1 more source

Asymmetric polar localization dynamics of the serine chemoreceptor protein Tsr in Escherichia coli. [PDF]

PLoS ONE, 2018
The spatial location of proteins in living cells can be critical for their function. For example, the E. coli chemotaxis machinery is localized to the cell poles.
Dongmyung Oh, Yang Yu, Hochan Lee, Jae-Hyung Jeon, Barry L Wanner, Ken Ritchie   +5 more
doaj   +1 more source

Signalling mechanisms of long term facilitation of breathing with intermittent hypoxia. [PDF]

, 2013
Intermittent hypoxia causes long-term facilitation (LTF) of respiratory motor nerve activity and ventilation, which manifests as a persistent increase over the normoxic baseline for an hour or more after the acute hypoxic ventilatory response.
Pamenter, Matthew E, Powell, Frank L
core   +1 more source

Solitary chemoreceptor cells in the nasal cavity serve as sentinels of respiration [PDF]

Proceedings of the National Academy of Sciences, 2003
Inhalation of irritating substances leads to activation of the trigeminal nerve, triggering protective reflexes that include apnea or sneezing. Receptors for trigeminal irritants are generally assumed to be located exclusively on free nerve endings within the nasal epithelium, requiring that trigeminal irritants diffuse through the junctional ...
Thomas E, Finger, Bärbel, Böttger, Anne, Hansen, Karl T, Anderson, Hessamedin, Alimohammadi, Wayne L, Silver   +5 more
openaire   +2 more sources

Pulmonary arterial mechanoreceptors mediate sustained sympathoexcitation during high altitude hypoxia in humans

Experimental Physiology, EarlyView.
Abstract Sympathetic nervous system activation is a hallmark of high‐altitude hypoxia, yet the afferent mechanisms remain incompletely defined. We examined the relative contributions of pulmonary arterial mechanoreceptors and carotid chemoreceptors – two excitatory pathways co‐activated by hypoxia – to sustained sympathoexcitation at altitude.
Michiel T. Ewalts, Lydia L. Simpson, Jack S. Talbot, Elliott J. Jenkins, Travis D. Gibbons, Connor A. Howe, Lauren E. Maier, Emily R. Vanden Berg, Alex M. Williams, Philip N. Ainslie, Samuel J. Oliver, Craig D. Steinback, Mike Stembridge, Jonathan P. Moore   +13 more
wiley   +1 more source

Cryo-Electron Tomography Reveals the Complex Ultrastructural Organization of Multicellular Filamentous Chloroflexota (Chloroflexi) Bacteria

Frontiers in Microbiology, 2020
The cell biology of Chloroflexota is poorly studied. We applied cryo-focused ion beam milling and cryo-electron tomography to study the ultrastructural organization of thermophilic Roseiflexus castenholzii and Chloroflexus aggregans, and mesophilic “Ca ...
Vasil A. Gaisin, Vasil A. Gaisin, Romain Kooger, Denis S. Grouzdev, Vladimir M. Gorlenko, Martin Pilhofer   +5 more
doaj   +1 more source

Electron cryotomography: a new view into microbial ultrastructure [PDF]

, 2009
Electron cryotomography (ECT) is an emerging technology that allows thin samples such as small bacterial cells to be imaged in 3D in a nearly native state to ‘molecular’ (not, vert, similar4 nm) resolution.
Jensen, Grant J., Li, Zhuo
core   +1 more source

Relationships Between Chemoreflex Responses, Sleep Quality, and Hematocrit in Andean Men and Women. [PDF]

, 2020
Andean highlanders are challenged by chronic hypoxia and many exhibit elevated hematocrit (Hct) and blunted ventilation compared to other high-altitude populations.
Anza-Ramirez, Cecilia, Corante, Noemi, DeYoung, Pamela N, Djokic, Matea A, Gaio, Eduardo, Gilbertson, Dillon, Heinrich, Erica C, Macarlupu, Jose L, Malhotra, Atul, Orr, Jeremy E, Powell, Frank L, Simonson, Tatum S, Villafuerte, Francisco C, Vizcardo-Galindo, Gustavo   +13 more
core   +1 more source

Resetting and postnatal maturation of oxygen chemosensitivity in rat carotid chemoreceptor cells [PDF]

The Journal of Physiology, 1999
1. Carotid chemoreceptor sensitivity is minimal immediately after birth and increases with postnatal age. In the present study we have investigated the peri- and postnatal developmental time course of [Ca2+]i responses to hypoxia in clusters of type I cells isolated from near-term fetal rats and rats that were 1, 3, 7, 11, 14 and 21 days old, using the
M J, Wasicko, L M, Sterni, O S, Bamford, M H, Montrose, J L, Carroll   +4 more
openaire   +2 more sources