EFFECTS OF PETROLEUM OILS ON THE CARBON DIOXIDE UPTAKE IN THE APPARENT PHOTOSYNTHESIS OF PARSNIP AND MUSTARD

1962 ◽  
Vol 40 (6) ◽  
pp. 887-896 ◽  
Author(s):  
V. A. Helson ◽  
Wm. Harold Minshall
Keyword(s):  
Carbon Dioxide ◽  
Compensation Point ◽  
Visible Injury ◽  
Carbon Dioxide Uptake ◽  
Boiling Range ◽  
Paraffinic Oil ◽  
Paraffin Fraction ◽  
Petroleum Oils

The herbicidal oils, petroleum naphtha, boiling range 149° to 204 °C, the naphthene–paraffin fraction of petroleum naphtha, undiluted n-dodecane, 25% p-cymene in paraffinic oil, and 15% tetrahydronaphthalene in paraffinic oil, caused an immediate decrease in apparent photosynthesis of both parsnip and mustard to near the respiration level. The photosynthesis of parsnip began to recover by 1 hour and was near 70% of normal with no visible injury by 24 hours after application of oil. With mustard, there was a slight temporary recovery during the first hour but then the photosynthesis completely ceased with the death of the leaves. Paraffinic oil containing 15% p-cymene was not selective, as the photosynthesis of mustard recovered to 40% of normal by 24 hours after application of the oil.A non-herbicidal, paraffinic oil, boiling range 204° to 260 °C, immediately decreased the apparent photosynthesis of both parsnip and mustard to the compensation point. The photosynthesis of both plants began to recover within 1 hour after application of the oil and was approaching normal by 24 hours, with no visible injury.

EFFECTS OF HERBICIDES ON CARBON DIOXIDE UPTAKE BY PINE SEEDLINGS

1967 ◽  
Vol 45 (7) ◽  
pp. 961-971 ◽  
Author(s):  
S. Sasaki ◽  
T. T. Kozlowski
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Soil Surface ◽  
Pinus Resinosa ◽  
Spray Application ◽  
Leaf Color ◽  
Carbon Dioxide Uptake ◽  
Chlorophyll Breakdown ◽  
Pine Seedlings ◽  
Steady Rate

Experiments were conducted on effects of herbicides applied to soil or sprayed on shoots on CO2 uptake of 3-year-old Pinus resinosa Ait. seedlings. When applied to the soil, atrazine, monuron, EPTC, and 2,4-D at 20 lb/ac (soil surface basis) or at 4000 p.p.m. variously decreased absorption of CO2. Monuron checked gas exchange most rapidly, with no CO2 uptake measurable after 10 days. Atrazine and 2,4-D inhibited absorption of CO2 at a steady rate. EPTC caused a delayed inhibition of CO2 uptake. DCPA, CDAA, CDEC, and NPA did not affect gas exchange significantly. Monuron applied as a spray depressed CO2 uptake somewhat faster than the soil-applied herbicide. Very rapid inhibition of CO2 uptake was observed after spray application of 2,4-D or EPTC. Atrazine affected gas exchange similarly when applied as a spray or incorporated in the soil. DCPA, applied as a spray, did not affect absorption of CO2 significantly. Possible reasons for differences in CO2 uptake after spray and soil-application of certain herbicides are discussed. Inert ingredients of EPTC applied as sprays at a concentration of 4000 p.p.m. greatly reduced CO2 absorption 3 days after treatment. However, the rapid early depression of gas exchange was followed by recovery, with no obvious deleterious effects on growth up to 3 months after treatment. Some herbicides checked CO2 absorption without chlorophyll breakdown whereas others did not. Monuron completely inhibited CO2 uptake long before any changes in leaf color were evident. In contrast, depression of CO2 absorption by atrazine and 2,4-D rather closely paralleled development of toxicity symptoms, especially chlorosis. These observations suggested that some herbicides such as monuron affected the photosynthetic mechanism more directly than others such as atrazine, 2,4-D, and EPTC.

Respiratory compensation point

2021 ◽  
pp. 93-96
Author(s):  
William J.M. Kinnear ◽  
James H. Hull
Keyword(s):  
Carbon Dioxide ◽  
Minute Ventilation ◽  
Cardiopulmonary Exercise Test ◽  
Compensation Point ◽  
Respiratory Compensation Point ◽  
Carbon Dioxide Output ◽  
Respiratory Compensation ◽  
Cardiopulmonary Exercise ◽  
The Subject ◽  
Maximal Effort

This chapter describes how acidaemia stimulates ventilation in the later stages of a cardiopulmonary exercise test (CPET). This happens after the anaerobic threshold, once the capacity of the blood to buffer lactic acid has been used up. The respiratory compensation point (RCP) can be identified from an increase in the slope when minute ventilation (VE) is plotted against carbon dioxide output (VCO2), or from a rise in the ventilatory equivalents for carbon dioxide (VeqCO2). The presence of a clear RCP indicates that the subject has made a fairly maximal effort during the CPET. An RCP also argues against significant lung disease, since it implies the ability to increase ventilation in response to acidaemia.

An azo-linked porous triptycene network as an absorbent for CO2 and iodine uptake

2016 ◽  
Vol 7 (3) ◽  
pp. 643-647 ◽  
Author(s):  
Qin-Qin Dang ◽  
Xiao-Min Wang ◽  
Yu-Fen Zhan ◽  
Xian-Ming Zhang
Keyword(s):  
Carbon Dioxide ◽  
Liquid Phase ◽  
Iodine Uptake ◽  
Carbon Dioxide Uptake ◽  
Porous Organic Framework ◽  
Organic Framework

An azo-linked porous organic framework (Azo-Trip) in which triptycene is incorporated as linkage, has been constructed via a facile Zn-induced reductive homocoulping reaction. The Azo-Trip exhibits selective carbon dioxide uptake and excellent iodine uptake in vapour and liquid phase.

Carbon dioxide uptake in nitrite-sodalite: reaction kinetics and template ordering of the carbonate-nosean formation

2015 ◽  
Vol 230 (4) ◽  
Author(s):  
Malik Šehović ◽  
Lars Robben ◽  
Thorsten M. Gesing
Keyword(s):  
Carbon Dioxide ◽  
Phase Transformation ◽  
Reaction Kinetics ◽  
Carbon Dioxide Uptake ◽  
Kinetics Of

AbstractWe report on the phase transformation and the reaction kinetics of aluminosilicate nitrite-sodalite |Na

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