Mobilized Permafrost Carbon is Concentrated in Particulate Matter and Ebullition Methane in Northern Quebec Thaw Lakes

SummaryIt has been suggested that human platelets possess the ability to phagocytose particulate matter similar to the polymorphonuclear leukocyte. However some difference of opinion has arisen regarding this contention, particularly as differences have been demonstrated with regard to the observed metabolic changes occurring in platelets related to such a process.The experiments reported in this paper were designed to observe the aerobic and anaerobic metabolism in human platelets during and following interiorization of two different particles, viz. polystyrene latex and thorotrast. The results of these experiments show a marked difference between both types of particles with regard to observable metabolic changes despite the rapid interiorization of both types of material. Some alteration occurs in both aerobic and anaerobic metabolism a considerable time after interiorization of latex, whereas no alteration could be demonstrated after interiorization of thorotrast. It is suggested that the interiorization of particulate matter is by some process other than phagocytosis and that observed metabolic changes related to latex may be due to a release reaction.

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Pulmonary Embolization in the Dog: Its Effects on Blood Coagulation and on Pulmonary Artery Pressures

Thrombosis and Haemostasis ◽

10.1055/s-0038-1654536 ◽

1961 ◽

Vol 06 (01) ◽

pp. 025-036 ◽

Cited By ~ 1

Author(s):

James W. Hampton ◽

William E. Jaques ◽

Robert M. Bird ◽

David M. Selby

Keyword(s):

Pulmonary Hypertension ◽

Particulate Matter ◽

Pulmonary Artery ◽

Amniotic Fluid ◽

Blood Coagulation ◽

Glass Beads ◽

Pulmonary Vessels ◽

Pulmonary Embolization ◽

Biological Nature

Summary1. Infusions containing particulate matter, viz. whole amniotic fluid, amniotic fluid sediment, and glass beads, produce in dogs changes in both early and late phases of the clotting reaction. These changes are associated with the development of pulmonary hypertension.2. When dogs were given an active fibrinolysin followed by an infusion of whole amniotic fluid, the alterations in the clotting mechanism were either delayed or did not appear. No pulmonary hypertension developed in these animals.3. We infer that infusions containing particulate matter will produce in dogs both pulmonary hypertension and changes in the clotting mechanism. Although these are independent changes, both are as closely related to the damage to the pulmonary vessels as they are to the biological nature of the infusions.

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Focus on Thermokarst Lakes in Indian Himalaya: Inception and Implication under Warming Climate

Journal of Climate Change ◽

10.3233/jcc200012 ◽

2020 ◽

Vol 6 (2) ◽

pp. 59-69

Author(s):

Pratima Pandey ◽

S. Nawaz Ali ◽

Vikram Sharma ◽

Prashant K. Champati Ray

Keyword(s):

Western Himalaya ◽

High Mountain ◽

Thermokarst Lakes ◽

Glacial Environments ◽

Global Warming Scenario ◽

Scientific Attention ◽

Topographic Depressions ◽

Permafrost Thawing ◽

The Impact ◽

Thaw Lakes

Thermokarst (Thaw) lakes are landforms found in topographic depressions created by thawing ground ice in permafrost zones. They play an important role in the regulation of climatic functions. These lakes are a manifestation of warming surface temperatures that accelerates the ice-rich permafrost to degrade by creating marshy hollows/ponds. In the current global warming scenario, the thermokarst lakes in the high mountain regions (Himalaya) are expected to grow further. This accelerate permafrost thawing which will affect the carbon cycle, hydrology and local ecosystems. This phenomenon has attracted huge scientific attention because it has led to a rapid mass change of glaciers in the region, including extensive changes occurring on peri-glacial environments. The most striking fact is the release of an enormous amount of greenhouse gases, including methane, carbon dioxide and nitrous oxide that is locked in these lakes. The present study delves into the thermokarst lakes in the upper reaches of Chandra Valley and Western Himalaya. The study also aims at designating the impact of their changes on the ecosystem, particularly their influence on the atmospheric greenhouse gas concentrations.

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