A NOTE ON THE USE OF INDIUM FOR REMOVAL OF MERCURY VAPOR IN VACUUM SYSTEMS

1954 ◽  
Vol 32 (6) ◽  
pp. 591-592 ◽  
Author(s):  
R. D. Heyding ◽  
E. A. Flood
Keyword(s):  
Induction Period ◽  
Mercury Vapor ◽  
Vacuum Systems ◽  
Short Induction Period

It is shown that metallic indium adsorbs mercury vapor quite rapidly after a short induction period. It is suggested that indium may be found useful in removing traces of mercury vapor from vacuum systems.

Suppressing Mercury Vapor in Vacuum Systems

1950 ◽  
Vol 21 (5) ◽  
pp. 496-496 ◽  
Author(s):  
Frederick Ayer
Keyword(s):  
Mercury Vapor ◽  
Vacuum Systems

Lysozyme as a transferase

1967 ◽  
Vol 167 (1009) ◽  
pp. 429-430 ◽  
Keyword(s):  
Induction Period ◽  
Binding Sites ◽  
Reaction Rate ◽  
Enzyme Concentration ◽  
Synthetic Process ◽  
Short Induction Period ◽  
Direct Hydrolysis

Our first investigations of the action of lysozyme on tetrasaccharides isolated from chitin showed that lysozyme, like many other known glycosides, is a transferase. Under certain conditions (oligosaccharide concentration 1 to 2%, the enzyme concentration 0.5%) the synthetic process may yield an insoluble chitin-like product. Judging by the increase of the Morgan-Elson reaction, lysozyme digests the tetrasaccharide intensively (figure 44). The trisaccharide reacts after a short induction period. Chitobiose reacts with more difficulty, and the induction period is several hours. Addition of the tetrasaccharide increases the reaction rate considerably, just as in the case of certain glycosidases, e. g. chitobiose is a much worse acceptor of transglycosidic residues than the tetrasaccharide (figure 45). For the present we have no data about the correlation between the rates of formation of low-and high molecular products, nor about the rate of direct hydrolysis. The transglucosilation by lysozyme implies at least three binding sites for the substrate.

Mercury vapor levels in exhaust air from dental vacuum systems

2007 ◽  
Vol 23 (5) ◽  
pp. 527-532 ◽  
Author(s):  
Mark E. Stone ◽  
Mark E. Cohen ◽  
Brad A. Debban
Keyword(s):  
Mercury Vapor ◽  
Vacuum Systems

A SYSTEM FOR PROTECTING AN OIL DIFFUSION PUMP AGAINST FAILURE OF THE MECHANICAL FORE PUMP, COOLING WATER, OR ELECTRICITY

1970 ◽  
Vol 28 ◽  
pp. 344-345
Author(s):  
W. C. Bigelow ◽  
F. B. Drogosz ◽  
S. Nitschke
Keyword(s):  
High Vacuum ◽  
Cooling Water ◽  
Effective Protection ◽  
Pump Line ◽  
Diffusion Pump ◽  
System Pressure ◽  
Control Relay ◽  
Vacuum Systems ◽  
Vacuum Gage ◽  
Pressure Switch

High vacuum systems with oil diffusion pumps usually have a pressure switch to protect against Insufficient cooling water; however, If left unattended for long periods of time, failure of the mechanical fore pump can occur with equally serious results. The device shown schematically in Fig. 1 has been found to give effective protection against both these failures, yet it is inexpensive and relatively simple to build and operate.With this system, pressure in the fore pump line is measured by thermocouple vacuum gage TVG (CVC G.TC-004) whose output is monitored by meter relay MRy (Weston 1092 Sensitrol) which is set to close if the pressure rises above about 0.2 torr. This energizes control relay CRy (Potter & Brumfield KA5Y 120VAC SPDT) cutting off power to solenoid-operated fore line valve Vf (Cenco 94280-4 Norm. Closed) which closes to prevent further leakage of air into the diffusion pump

Fibrin Formation: The Role of the Fibrinogen-Fibrin Monomer Complex

1976 ◽  
Vol 36 (01) ◽  
pp. 037-048 ◽  
Author(s):  
Eric P. Brass ◽  
Walter B. Forman ◽  
Robert V. Edwards ◽  
Olgierd Lindan
Keyword(s):  
Particle Size ◽  
Induction Period ◽  
Fibrin Clot ◽  
Clot Formation ◽  
Appreciable Amount ◽  
Buffer System ◽  
Homeostatic Mechanism ◽  
Fibrin Formation ◽  
Fibrin Monomer

SummaryThe process of fibrin formation using highly purified fibrinogen and thrombin was studied using laser fluctuation spectroscopy, a method that rapidly determines particle size in a solution. Two periods in fibrin clot formation were noted: an induction period during which no fibrin polymerization occurred and a period of rapid increase in particle size. Direct measurement of fibrin monomer polymerization and fibrinopeptide release showed no evidence of an induction period. These observations were best explained by a kinetic model for fibrin clot formation incorporating a reversible fibrinogen-fibrin monomer complex. In this model, the complex serves as a buffer system during the earliest phase of fibrin formation. This prevents the accumulation of free polymerizable fibrin monomer until an appreciable amount of fibrinogen has reacted with thrombin, at which point the fibrin monomer level rises rapidly and polymerization proceeds. Clinically, the complex may be a homeostatic mechanism preventing pathological clotting during periods of elevated fibrinogen.

Mercury vapor filter technology and ultraviolet laser source for flowfield imaging

1997 ◽  
Author(s):  
N. Finkelstein ◽  
W. Lempert ◽  
R. Miles ◽  
N. Finkelstein ◽  
W. Lempert ◽  
...  
Keyword(s):  
Mercury Vapor ◽  
Laser Source ◽  
Ultraviolet Laser
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