scholarly journals THE PERMEABILITY OF CELLS FOR OXYGEN AND ITS SIGNIFICANCE FOR THE THEORY OF STIMULATION

1922 ◽  
Vol 5 (2) ◽  
pp. 215-222 ◽  
Author(s):  
E. Newton Harvey
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Phase Boundary ◽  
Oxygen Concentration ◽  
Plant Cells ◽  
Living Cells ◽  
High Oxygen ◽  
Living Plant ◽  
Indicator Method ◽  
Dead Plant

It can be demonstrated by an indicator method that living cells are as freely permeable to oxygen as dead cells, and that sudden admission of oxygen to the cell cannot account for increased oxidation as a result of stimulation. Oxygen penetrates as readily as carbon dioxide among the acids and ammonia among the alkalies. Exposure of living plant cells to high oxygen pressures does not initiate certain oxidations (except after some hours), which proceed readily in dead plant cells in the air. In the light of the preceding statement, about the permeability of cells for oxygen, this is interpreted to mean that more oxygen enters the cell at high pressure, but that the reacting substances (chromogen and oxidase) are kept apart by some phase boundary as long as the cell is alive. Increased oxygen concentration eventually produces injury to the cell.

scholarly journals Deaths from Environmental Hypoxia and Raised Carbon Dioxide

2018 ◽  
Vol 8 (1) ◽  
pp. 2-7 ◽  
Author(s):  
Christopher M. Milroy
Keyword(s):  
Carbon Dioxide ◽  
Natural Disasters ◽  
Oxygen Concentration ◽  
High Oxygen ◽  
High Oxygen Concentration ◽  
Work Related ◽  
Environmental Hypoxia ◽  
Postmortem Toxicology ◽  
Criminal Charges ◽  
Lake Nyos

This paper reviews deaths in which there is an environment that is low in oxygen and/or has elevated levels of carbon dioxide. These deaths present problems to autopsy pathologists, as the autopsy is typically negative and postmortem toxicology cannot be used to detect the effects of hypoxia and raised levels of carbon dioxide. Deaths from hypoxia and raised carbon dioxide may be encountered in work-and nonwork-related environments. Typically these are accidents, but suicides may be encountered and criminal charges may follow these events. Environments that have been associated with these events include mines, tunnels, sewers, and pits. Transportation incidents may also be associated with hypoxic events, particularly aircraft and submarines. When an atmosphere low in oxygen is entered, collapse can be rapid, or immediate if the environmental oxygen is below 6%. Environments rich in carbon dioxide can also cause death, even with a high oxygen concentration. Such environments may be encountered in industrial settings, but also occur in natural disasters such as the Lake Nyos disaster. The identification of these deaths typically requires a coordinated investigation with safety inspectors and other experts in industrial- and work-related deaths.

Confocal microscopy of the cytoskeleton in living plant cells following microinjection of fluorescent probes

1993 ◽  
Vol 51 ◽  
pp. 130-131
Author(s):  
Ann Cleary
Keyword(s):  
Cell Division ◽  
Fluorescent Probes ◽  
Actin Filaments ◽  
Intracellular Transport ◽  
Cell Structure ◽  
Plant Cells ◽  
Cell Plate ◽  
Cell Cortex ◽  
Living Plant ◽  
Rhodamine Phalloidin

Microinjection of fluorescent probes into living plant cells reveals new aspects of cell structure and function. Microtubules and actin filaments are dynamic components of the cytoskeleton and are involved in cell growth, division and intracellular transport. To date, cytoskeletal probes used in microinjection studies have included rhodamine-phalloidin for labelling actin filaments and fluorescently labelled animal tubulin for incorporation into microtubules. From a recent study of Tradescantia stamen hair cells it appears that actin may have a role in defining the plane of cell division. Unlike microtubules, actin is present in the cell cortex and delimits the division site throughout mitosis. Herein, I shall describe actin, its arrangement and putative role in cell plate placement, in another material, living cells of Tradescantia leaf epidermis.The epidermis is peeled from the abaxial surface of young leaves usually without disruption to cytoplasmic streaming or cell division. The peel is stuck to the base of a well slide using 0.1% polyethylenimine and bathed in a solution of 1% mannitol +/− 1 mM probenecid.

scholarly journals The degradation of cellulose in ionic mixture solutions under the high pressure of carbon dioxide

RSC Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 3484-3494
Author(s):  
Sumarno ◽  
Prida Novarita Trisanti ◽  
Bramantyo Airlangga ◽  
Novi Eka Mayangsari ◽  
Agus Haryono
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Hydrothermal Process ◽  
Reducing Sugar

Cellulose processing by a hydrothermal process as well as in combination with a sonication pretreatment under a CO2 pressurization that affects the morphology and reducing sugar products.

A New Oxygen Mask: Comparison with Other Clinical Methods of Giving Oxygen

1974 ◽  
Vol 2 (3) ◽  
pp. 214-219 ◽  
Author(s):  
W A Crosbie ◽  
J P Warren ◽  
L A Smith
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Concentration ◽  
Cor Pulmonale ◽  
Blood Levels ◽  
Supplementary Oxygen ◽  
Arterial Blood ◽  
Oxygen Mask ◽  
Clinical Methods ◽  
Expired Air

The performance of a new mask (Mix-O-Mask) for giving supplementary oxygen in clinical situations was compared with three other methods in a patient with cor pulmonale. Measurements were made of the intra-tracheal gas concentrations and arterial blood levels of oxygen and carbon dioxide. The new mask was as reliable as Ventimasks in delivering a claimed oxygen concentration and did not cause rebreathing of expired air. The mask proved durable when worn for sixteen hours in a day and was preferred for comfort by the patient.

scholarly journals Behavior of Microtubules in Living Plant Cells

1996 ◽  
Vol 112 (2) ◽  
pp. 455-461 ◽  
Author(s):  
P. K. Hepler ◽  
J. M. Hush
Keyword(s):  
Plant Cells ◽  
Living Plant
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