Two-step alkaline thorium dioxide precipitation A low waste method for highly sinterable ThO2

1967 ◽

Vol 25 ◽

pp. 52-53 ◽

Cited By ~ 2

Author(s):

William J. Dougherty ◽

Samuel S. Spicer

Keyword(s):

Striated Muscle ◽

Divalent Cations ◽

Ultrastructural Localization ◽

Major Elements ◽

Frozen Sections ◽

Thorium Dioxide ◽

Iron Solution ◽

Coupling System ◽

Psoas Muscles ◽

Formalin Fixed

In recent years, considerable attention has focused on the morphological nature of the excitation-contraction coupling system of striated muscle. Since the study of Porter and Palade, it has become evident that the sarcoplastic reticulum (SR) and transverse tubules constitute the major elements of this system. The problem still exists, however, of determining the mechamisms by which the signal to interdigitate is presented to the thick and thin myofilaments. This problem appears to center on the movement of Ca++ions between myofilaments and SR. Recently, Philpott and Goldstein reported acid mucosubstance associated with the SR of fish branchial muscle using the colloidal thorium dioxide technique, and suggested that this material may serve to bind or release divalent cations such as Ca++. In the present study, Hale's iron solution adapted to electron microscopy was applied to formalin-fixed myofibrils isolated from glycerol-extracted rabbit psoas muscles and to frozen sections of formalin-fixed rat psoas muscles.

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Ultrastructure of Lymphatic Capillaries in the Transport of Colloidal Particles

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100060945 ◽

1967 ◽

Vol 25 ◽

pp. 186-187

Author(s):

L. V. Leak ◽

J. F. Burke

Keyword(s):

Connective Tissue ◽

Colloidal Particles ◽

Ultrastructural Level ◽

Vital Role ◽

Time Intervals ◽

Thorium Dioxide ◽

Lymphatic Capillary ◽

Tissue Area ◽

Rapid Removal ◽

Tissue Fluids

The vital role played by the lymphatic capillaries in the transfer of tissue fluids and particulate materials from the connective tissue area can be demonstrated by the rapid removal of injected vital dyes into the tissue areas. In order to ascertain the mechanisms involved in the transfer of substances from the connective tissue area at the ultrastructural level, we have injected colloidal particles of varying sizes which range from 80 A up to 900-mμ. These colloidal particles (colloidal ferritin 80-100A, thorium dioxide 100-200 A, biological carbon 200-300 and latex spheres 900-mμ) are injected directly into the interstitial spaces of the connective tissue with glass micro-needles mounted in a modified Chambers micromanipulator. The progress of the particles from the interstitial space into the lymphatic capillary lumen is followed by observing tissues from animals (skin of the guinea pig ear) that were injected at various time intervals ranging from 5 minutes up to 6 months.

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An integrated experimental and computational investigation of defect and microstructural effects on thermal transport in thorium dioxide

Acta Materialia ◽

10.1016/j.actamat.2021.116934 ◽

2021 ◽

pp. 116934

Author(s):

Cody A. Dennett ◽

W. Ryan Deskins ◽

Marat Khafizov ◽

Zilong Hua ◽

Amey Khanolkar ◽

...

Keyword(s):

Thermal Transport ◽

Computational Investigation ◽

Thorium Dioxide ◽

Microstructural Effects

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Thorium amidates function as single-source molecular precursors for thorium dioxide

Chemical Communications ◽

10.1039/d1cc00867f ◽

2021 ◽

Author(s):

Mark D. Straub ◽

Erik T. Ouellette ◽

Michael A. Boreen ◽

Jacob A. Branson ◽

Alex Ditter ◽

...

Keyword(s):

Thermal Properties ◽

Single Source ◽

Thorium Dioxide ◽

Molecular Precursors

Volatile thorium amidates can be converted to ThO2 in the absence of an external oxygen source, and the thermal properties of these precursors can be readily tuned by modifying the ligand substituents.

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Clearance rate in relation to agglutinins for gelatin-stabilized colloid in the rat

American Journal of Physiology-Legacy Content ◽

10.1152/ajplegacy.1963.204.4.655 ◽

1963 ◽

Vol 204 (4) ◽

pp. 655-659 ◽

Cited By ~ 8

Author(s):

I. MacKay Murray

Keyword(s):

Iron Oxide ◽

Clearance Rate ◽

Reticuloendothelial System ◽

Transient Increase ◽

Clearance Rates ◽

Time Intervals ◽

Thorium Dioxide ◽

Plasma Response ◽

Circulating Levels

Intravascular clearance rates of gelatin-stabilized gold were compared with circulating titers of gelatin agglutinins in rats at increasing time intervals after blockading injections of gelatin-stabilized gold and S. marcescens endotoxin. The degree and duration of reticuloendothelial system (RES) blockade against the homologous colloid were directly related to the circulating levels of gelatin agglutinins. In contrast, plasma agglutinins were not decreased in endotoxin-induced blockade against the gelatin-stabilized colloid. In a further experiment, the plasma response to blockading injections of colloidal thorium dioxide, iron oxide, and zymosan was characterized by a transient increase in gelatin agglutinins suggesting the nonspecific release of opsonins from an extravascular source. The findings indicated that clearance rates of gelatin-stabilized colloids were dependent on the total available opsonin in the rat rather than the total circulating opsonin. It is suggested that RES blockade is effected by the prior nonspecific depletion of opsonins from an extravascular reserve which is the major component of the total available opsonin.

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