THE ACTIVATION OF PURIFIED HUMAN PLASMINOGEN IN SOLUTIONS OF ETHYLENE GLYCOLS

1963 ◽  
Vol 41 (1) ◽  
pp. 889-895 ◽  
Author(s):  
Phyllis S. Roberts
Keyword(s):  
Methyl Ester ◽  
Ethylene Glycol ◽  
Diethylene Glycol ◽  
Room Temperature ◽  
Fast Rate ◽  
Triethylene Glycol ◽  
Ethylene Glycols ◽  
Human Plasminogen ◽  
Glycol Solution ◽  
Rate Of Accumulation

Ethylene glycols have been found to allow activation of purified preparations of human plasminogen. The activity of the enzyme formed, plasmin, was measured using TAMe (p-toluene-sulphonyl-L-arginine methyl ester) as a substrate. In 50% (v/v) solutions of these compounds at pH 7.6 and 30 °C, plasmin accumulated faster in diethylene and triethylene glycols than in glycerol, but in ethylene glycol no plasmin was found. When lower concentrations of ethylene glycol (from zero to 50%) and shorter times of incubation were used, plasmin was found. With equimolar solutions (4.3 M) of glycerol and the three glycols, only diethylene glycol showed a fast rate of accumulation of plasmin. A 50% triethylene glycol solution partially inhibited the rate of spontaneous activation but stabilized the plasmin formed and therefore enzyme accumulated. At room temperature more plasmin accumulated than at higher temperatures when plasminogen was incubated in 50% triethylene glycol solution, and no plasmin was found when plasminogen was incubated at pH 7.6, 30 °C, in 50% solutions of propylene glycols, several ethers of the ethylene glycols, several polymers of various glycols, and dioxane.

THE ACTIVATION OF PURIFIED HUMAN PLASMINOGEN IN SOLUTIONS OF ETHYLENE GLYCOLS

1963 ◽  
Vol 41 (4) ◽  
pp. 889-895 ◽  
Author(s):  
Phyllis S. Roberts
Keyword(s):  
Methyl Ester ◽  
Ethylene Glycol ◽  
Diethylene Glycol ◽  
Room Temperature ◽  
Fast Rate ◽  
Triethylene Glycol ◽  
Ethylene Glycols ◽  
Human Plasminogen ◽  
Glycol Solution ◽  
Rate Of Accumulation

Ethylene glycols have been found to allow activation of purified preparations of human plasminogen. The activity of the enzyme formed, plasmin, was measured using TAMe (p-toluene-sulphonyl-L-arginine methyl ester) as a substrate. In 50% (v/v) solutions of these compounds at pH 7.6 and 30 °C, plasmin accumulated faster in diethylene and triethylene glycols than in glycerol, but in ethylene glycol no plasmin was found. When lower concentrations of ethylene glycol (from zero to 50%) and shorter times of incubation were used, plasmin was found. With equimolar solutions (4.3 M) of glycerol and the three glycols, only diethylene glycol showed a fast rate of accumulation of plasmin. A 50% triethylene glycol solution partially inhibited the rate of spontaneous activation but stabilized the plasmin formed and therefore enzyme accumulated. At room temperature more plasmin accumulated than at higher temperatures when plasminogen was incubated in 50% triethylene glycol solution, and no plasmin was found when plasminogen was incubated at pH 7.6, 30 °C, in 50% solutions of propylene glycols, several ethers of the ethylene glycols, several polymers of various glycols, and dioxane.

PREPARATION OF THE ETHERS OF VINYL ALCOHOL

1932 ◽  
Vol 7 (5) ◽  
pp. 464-471 ◽  
Author(s):  
William Chalmers
Keyword(s):  
Ethylene Glycol ◽  
Diethylene Glycol ◽  
Room Temperature ◽  
Vinyl Methyl ◽  
Vinyl Ethers ◽  
Butyl Ether ◽  
Vinyl Methyl Ether ◽  
Alkyl Ethers ◽  
First Time ◽  
Dialkyl Ethers

The simple vinyl alkyl ethers are readily prepared from the β-bromo-ethyl ethers by the action of solid sodium hydroxide. Besides the vinyl ethers, the dialkyl ethers of diethylene glycol are formed in these reactions. β-Bromo-ethers are obtainable from the mono-ethers of ethylene glycol through the use of phosphorus tribromide. The constants of several vinyl ethers are given for the first time. The preparation of vinyl methyl ether, a gas at room temperature, and of vinyl n-butyl ether, b.p. 93.3 °C., is described.

Green synthesis of a carbon-rich layer on the surface of SiC at room temperature by anodic etching in dilute hydrofluoric acid/ethylene glycol solution

2016 ◽  
Vol 5 (5) ◽  
Author(s):  
Tuan Anh Cao ◽  
Truc Quynh Ngan Luong ◽  
Tran Cao Dao
Keyword(s):  
Ethylene Glycol ◽  
Hydrofluoric Acid ◽  
Room Temperature ◽  
Carbon Materials ◽  
Removal Rate ◽  
Electrical Energy ◽  
Nanostructured Carbon ◽  
Anodic Etching ◽  
Diluted Solution ◽  
Glycol Solution

AbstractCarbide-derived carbons (CDCs) are a growing class of nanostructured carbon materials with properties that are desirable for many applications, ranging from electrical energy to gas storage. However, the synthesis of CDCs often requires high temperatures and/or pressures, as well as toxic chemicals. In this report, we demonstrate environmentally friendly synthesis of a carbon-rich layer on the surface of SiC by anodic etching at room temperature in a highly diluted solution of hydrofluoric acid in ethylene glycol. In our opinion, the carbon-rich layer was formed thanks to the fact that we have used the etching conditions in which the rate of removal of carbon from SiC has become significantly lower compared with the silicon removal rate. More specifically, we have created an environment for SiC anodic etching where there is little water. In such conditions, silicon is still being removed from SiC, thanks to the direct dissolution, whereas the carbon removal rate is significantly reduced, due to the fact that carbon can be lost only by oxidation, but there is not enough water to oxidize carbon as in solutions with plenty of water. Thus, a carbon-rich layer is created on the etched SiC surface.

FIRE SAFETY OF HEAT-TRANSFER AGENTS FOR HEAT GENERATORS

2021 ◽  
pp. 11-21
Author(s):  
Геннадий Тимофеевич Земский ◽  
Леонид Петрович Вогман ◽  
Наталья Валентиновна Кондратюк
Keyword(s):  
Heat Transfer ◽  
Ethylene Glycol ◽  
Fire Safety ◽  
Diethylene Glycol ◽  
Operating Temperature ◽  
Triethylene Glycol ◽  
Fire Extinguishing ◽  
Nitrite Nitrate ◽  
Nitrate Mixture ◽  
Transfer Agents

Рассмотрены свойства двух групп теплоносителей, используемых для понижения рабочей температуры и для повышения рабочей температуры. В первую группу теплоносителей включены: этиленгликоль, диэтиленгликоль, триэтиленгликоль, пропиленгликоль, глицерин. Вторую группу теплоносителей составляют: дифенильная смесь, масло АМТ-300, масло ТЛВ-330, мобильтерм-600, дикумилметан, дитолилметан, тетрахлордифенил, тетракрезилсиликат, нафталин, тройная нафталиновая смесь, нитрит-нитратная смесь. Приводятся физико-химические и пожароопасные свойства названных теплоносителей, а также перечень профилактических противопожарных мероприятий и средств пожаротушения. There are considered the properties of two groups of heat-transfer agents used to reduce the operating temperature and to increase the operating temperature. The following substances are included in the first group of heat-transfer agents: ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycerin. The following substances are included in the second group of heat-transfer agents: diphenyl mixture, AMT-300 oil, TLV-330 oil, mobileterm-600, dicumylmethane, ditolylmethane, tetrachlorodiphenyl, tetracresyl silicate, naphthalene, triple naphthalene mixture, nitrite-nitrate mixture. There are cited the physicochemical and fire hazardous properties of the mentioned heat-transfer agents, as well as the list of preventive fire-fighting measures and fire-extinguishing facilities.

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