Research On Oxygen Toxicity At The Cellular Level
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| Author | : Willis H. Riesen |
| Publisher | : |
| Total Pages | : 84 |
| Release | : 1966 |
| Genre | : Oxygen |
| ISBN | : |
The use of pure oxygen atmospheres at reduced pressure in manned spacecraft has stimulated new research interest. Exposure of humans to pure oxygen at total pressures of 5 to 7 psia for up to 30 days has generally produced only subjective and occasional symptomatic distress. Nevertheless, studies with animals have clearly documented toxicity if the exposure to pure oxygen is at higher total pressures. The selection of suitable oxygen atmospheres for manned space flight and the development of protective measures against toxic manifestations will be considerably facilitated by a clearer understanding of the toxic syndrome. Rats, dogs, and monkeys were exposed to pure (98.5%) oxygen at 1 atm and 1/3 atm in a closed, recirculating chamber and in a nonrecirculating chamber. Rats exposed to a pressure of 1 atm showed significant reduction in efficiency of liver mitochondrial oxidative phosphorylation. Weight loss accompanied this change. Insignificant changes were found in liver or lung mitochondrial oxygen consumption; liver or lung NAD, NADH, or NAD/NADH; and arterial blood lactate and pyruvate, and lactate/pyruvate ratio. A composite index of oxygen toxicity was derived from a multivariant data analysis. Exposure of rats to pure oxygen at 1/3 atm showed slight elevation in P/O ratio in 7 days. The ratio returned to normal in 2 weeks and remained so for 8 months. No significant weight changes were observed. Only preliminary experiments with the dogs and monkeys were conducted, therefore no conclusions can as yet be made. There is an indication that monkeys are more resistant to oxygen toxicity at 1 atm than rats.
| Author | : Roland N. Pittman |
| Publisher | : Biota Publishing |
| Total Pages | : 117 |
| Release | : 2016-08-18 |
| Genre | : Medical |
| ISBN | : 1615047212 |
This presentation describes various aspects of the regulation of tissue oxygenation, including the roles of the circulatory system, respiratory system, and blood, the carrier of oxygen within these components of the cardiorespiratory system. The respiratory system takes oxygen from the atmosphere and transports it by diffusion from the air in the alveoli to the blood flowing through the pulmonary capillaries. The cardiovascular system then moves the oxygenated blood from the heart to the microcirculation of the various organs by convection, where oxygen is released from hemoglobin in the red blood cells and moves to the parenchymal cells of each tissue by diffusion. Oxygen that has diffused into cells is then utilized in the mitochondria to produce adenosine triphosphate (ATP), the energy currency of all cells. The mitochondria are able to produce ATP until the oxygen tension or PO2 on the cell surface falls to a critical level of about 4–5 mm Hg. Thus, in order to meet the energetic needs of cells, it is important to maintain a continuous supply of oxygen to the mitochondria at or above the critical PO2 . In order to accomplish this desired outcome, the cardiorespiratory system, including the blood, must be capable of regulation to ensure survival of all tissues under a wide range of circumstances. The purpose of this presentation is to provide basic information about the operation and regulation of the cardiovascular and respiratory systems, as well as the properties of the blood and parenchymal cells, so that a fundamental understanding of the regulation of tissue oxygenation is achieved.
| Author | : Tom S. Neuman |
| Publisher | : Elsevier Health Sciences |
| Total Pages | : 637 |
| Release | : 2008-06-05 |
| Genre | : Medical |
| ISBN | : 1416034064 |
Written by internationally recognized leaders in hyperbaric oxygen therapy (HBOT) research and practice, this exciting new book provides evidence-based, practical, useful information for anyone involved in HBOT. It outlines the physiologic principles that constitute the basis for understanding the clinical implications for treatment and describes recent advances and current research, along with new approaches to therapy. This book is an essential tool for anyone who cares for patients with difficult-to-heal wounds, wounds from radiation therapy, carbon monoxide poisoning, and more. Provides comprehensive coverage of pathophysiology and clinically relevant information so you can master the specialty. Covers the relevance of HBOT in caring for diverse populations including critical care patients, infants and pediatric patients, and divers. Features a section on the technical aspects of HBOT to provide insight into the technology and physics regarding HBO chambers. Presents evidence to support the effectiveness of HBOT as well as the possible side effects. Describes situations where HBOT would be effective through indication-specific chapters on chronic wounds, radiation and crush injuries, decompression sickness, and more.
| Author | : Giuseppe Buonocore |
| Publisher | : Springer |
| Total Pages | : 0 |
| Release | : 2018-10-23 |
| Genre | : Medical |
| ISBN | : 9783319294872 |
This landmark book, a reference work now in its second edition, provides healthcare practitioners in neonatology with an up-to-date, comprehensive source of readily accessible practical advice that will assist in the expert management of patients and their diverse illnesses. Leading experts in their fields discuss the underlying causes and mechanisms and all aspects of the treatment of the full range of neonatal diseases and abnormalities, citing the evidence base whenever appropriate. In addition, detailed information is provided on epidemiology and fetal medicine; therapeutic issues such as the organization of care, transport services, and home care after discharge; legal issues; nutrition; and the consequences of medication use during pregnancy, maternal drug abuse and smoking, and maternal diabetes. The inclusion of summaries, tables, and carefully selected guidelines and recommendations will supply practitioners with quick references and instant solutions during daily practice. The book will be a superb resource for all involved in the care of newborn babies, including neonatologists, pediatricians, pediatric surgeons, anesthesiologists, midwives, and nursing staff. It is published within the SpringerReference program, which delivers access to living editions constantly updated through a dynamic peer-review publishing process.
| Author | : Loutfy H. Madkour |
| Publisher | : Academic Press |
| Total Pages | : 782 |
| Release | : 2020-06-27 |
| Genre | : Medical |
| ISBN | : 0128224967 |
Reactive Oxygen Species (ROS), Nanoparticles, and Endoplasmic Reticulum (ER) Stress-Induced Cell Death Mechanisms presents the role of ROS?mediated pathways cellular signaling stress, endoplasmic reticulum (ER) stress, oxidative stress, oxidative damage, nanomaterials, and the mechanisms by which metalloids and nanoparticles induce their toxic effects. The book covers the ecotoxicology of environmental heavy metal ions and free radicals on macromolecules cells organisms, heavy metals?induced cell responses, oxidative stress, the source of oxidants, and the roles of ROS, oxidative stress and oxidative damage mechanisms. It also examines the nanotoxicity, cytotoxicity and genotoxicity mechanisms of nanomaterials and the effects of nanoparticle interactions. Antioxidant defense therapy and strategies for treatment round out the book, making it an ideal resource for researchers and professional scientists in toxicology, environmental chemistry, environmental science, nanomaterials and the pharmaceutical sciences. - Covers the ecotoxicology of environmental heavy metal ions and the interactions between specific heavy metals?induced cell responses and oxidative stress - Provides a better understanding of the mechanism of nanomaterial-induced toxicity as a first defense for hazard prevention - Covers recent advances in new nanomedication technologies for the effects of NPs on oxidative stress, ROS and ER stress - Discusses the effects of interactions between antioxidant defense therapy, ROS and strategies for treatment
| Author | : Lawrence J. Berliner |
| Publisher | : Springer Nature |
| Total Pages | : 241 |
| Release | : 2020-08-08 |
| Genre | : Science |
| ISBN | : 303047318X |
This book describes the methods of analysis and determination of oxidants and oxidative stress in biological systems. Reviews and protocols on select methods of analysis of ROS, RNS, oxygen, redox status, and oxidative stress in biological systems are described in detail. It is an essential resource for both novices and experts in the field of oxidant and oxidative stress biology.
| Author | : Jaspal Singh |
| Publisher | : Academic Press |
| Total Pages | : 428 |
| Release | : 2021-07-17 |
| Genre | : Medical |
| ISBN | : 0323886027 |
Hazardous Gases: Risk Assessment on Environment and Human Health examines all relevant routes of exposure, inhalation, skin absorption and ingestion, and control measures of specifics hazardous gases resulting from workplace exposure from industrial processes, traffic fumes, and the degradation of waste materials and how they impacts the health and environment of workers. The book examines the risk assessment and effect of poisonous gases on the environment human health. It also covers necessary emergency guidelines, safety measures, physiological impact, hazard control measures, handling and storage of hazardous gases. Each chapter is formatted to include an introduction, historical background, physicochemical properties, physiological role discussing mechanisms of toxicity, its effect on human health as well as environment, followed by case studies and recent research on toxic gases. Hazardous Gases: Risk Assessment on Environment and Human Health is a helpful resource for academics and researchers in toxicology, occupational health and safety, and environmental sciences as well as those in the field who work to assess and mitigate the impact of toxic gases on the work environment and the health of the workforce. - Emphasizes the environmental monitoring in the workplace of hazardous materials - Includes all relevant storage and handling information required for detailing all personnel on the hazards and risks from the substances with which they work - Offers practical examples and case studies related to toxic gases and their impact on health
| Author | : Joseph Priestley |
| Publisher | : |
| Total Pages | : 112 |
| Release | : 1894 |
| Genre | : Oxygen |
| ISBN | : |
| Author | : Eduardo Bancalari |
| Publisher | : Elsevier Health Sciences |
| Total Pages | : 419 |
| Release | : 2018-06-19 |
| Genre | : Medical |
| ISBN | : 0323568750 |
Dr. Richard Polin's Neonatology Questions and Controversies series highlights the most challenging aspects of neonatal care, offering trustworthy guidance on up-to-date diagnostic and treatment options in the field. In each volume, renowned experts address the clinical problems of greatest concern to today's practitioners, helping you handle difficult practice issues and provide optimal, evidence-based care to every patient. - Stay fully up to date in this fast-changing field with The Newborn Lung, 3rd Edition. - The most current clinical information throughout, including key management strategies that may reduce some of the chronic sequelae of neonatal respiratory failure. - New content on the role of microbiome in lung injury and lung development. - Current coverage of non-invasive respiratory support, perinatal events and their influence on lung development and injury, cell-based lung therapy, automation of respiratory support, and oxygenation targeting in preterm infants. - Consistent chapter organization to help you find information quickly and easily. - The most authoritative advice available from world-class neonatologists who share their knowledge of new trends and developments in neonatal care. Purchase each volume individually, or get the entire 7-volume set!Gastroenterology and NutritionHematology, Immunology and GeneticsHemodynamics and CardiologyInfectious Disease and Pharmacology New Volume!Nephrology and Fluid/Electrolyte PhysiologyNeurologyThe Newborn Lung
| Author | : John Donegan |
| Publisher | : CRC Press |
| Total Pages | : 250 |
| Release | : 2013-12-03 |
| Genre | : Science |
| ISBN | : 9814316059 |
In the last two decades, semiconductor quantum dots—small colloidal nanoparticles—have garnered a great deal of scientific interest because of their unique properties. Among nanomaterials, CdTe holds special technological importance as the only known II–VI material that can form conventional p–n junctions. This makes CdTe very important for the development of novel optoelectronic devices such as light-emitting diodes, solar cells, and lasers. Moreover, the demand for water-compatible light emitters and the most common biological buffers give CdTe quantum dots fields a veritable edge in biolabeling and bioimaging. Cadmium Telluride Quantum Dots: Advances and Applications focuses on CdTe quantum dots and addresses their synthesis, assembly, optical properties, and applications in biology and medicine. It makes for a very informative reading for anyone involved in nanotechnology and will also benefit those scientists who are looking for a comprehensive account on the current state of quantum dot–related research.
