Direct Extraction Techniques for Thermal Resistance of MESFET and HEMT Devices

2007 ◽  
Author(s):  
Iltcho Angelov ◽  
Camilla Karnfelt
Keyword(s):  
Thermal Resistance ◽  
Extraction Techniques ◽  
Direct Extraction

scholarly journals New extraction techniques on bioseparations: 2. Pertraction, direct extraction

2004 ◽  
Vol 58 (12) ◽  
pp. 535-547
Author(s):  
Anca-Irina Galaction ◽  
Dan Cascaval
Keyword(s):  
Mathematical Models ◽  
Carboxylic Acids ◽  
Separation Efficiency ◽  
Extraction Techniques ◽  
Direct Extraction ◽  
Experimental Conditions ◽  
Maximum Separation

The second part of this review presents our original results on the separation of some biosynthetic products (antibiotics, carboxylic acids, alcohols) by pertraction and direct extraction from broths without biomass filtration. For the analyzed systems, the experimental conditions required for reaching maximum separation efficiency and the mathematical models describing the process have been established. For all the studied cases, these extraction techniques simplify the technologies and reduce the overall cost of the product.

scholarly journals New extraction techniques on bioseparations: 1. Reactive extraction

2004 ◽  
Vol 58 (9) ◽  
pp. 375-386 ◽  
Author(s):  
Dan Cascaval ◽  
Anca-Irina Galaction
Keyword(s):  
Fermentation Broth ◽  
Product Inhibition ◽  
Reactive Extraction ◽  
Liquid Membranes ◽  
Extraction Techniques ◽  
High Dilution ◽  
Secondary Products ◽  
Direct Extraction ◽  
Downstream Processes ◽  
Further Development

The complexity of downstream processes for biosynthetic products constitutes a particularity of industrial biotechnologies, especially because of the biosynthetic product high dilution in fermentation broth, their chemical and thermal liability and the presence of secondary products. For these reasons, new separation techniques have been developed and applied to bioseparations. Among them, reactive extraction, pertraction (extraction and transport through liquid membranes) and direct extraction from broths have considerable potential and are required for the further development of many biotechnologies. This review is structured on two parts and presents our original results of the studies on the separation of some biosynthetic products (antibiotics, carboxylic acids, amino acids, alcohols) by reactive extraction in the first part, and by pertraction and direct extraction from broths without biomass filtration in the second. For all the analyzed cases, these extraction techniques simplify the technologies by reducing material and energy consumption, by avoiding product inhibition, by increasing the separation selectivity, therefore decreasing the overall cost of the product.

Malt Beverages and Brewing Materials: Screening and Confirmatory Methods for Nitrosamines in Beer

1982 ◽  
Vol 65 (3) ◽  
pp. 584-587
Author(s):  
Anthony J Cutaia
Keyword(s):  
Internal Standard ◽  
Reference Method ◽  
Mass Spectrometric ◽  
Screening Methods ◽  
Extraction Techniques ◽  
Direct Extraction ◽  
Standard Calculation ◽  
Calculation Procedures

Abstract Screening methods for nitrosamines in beer were studied by 15 collaborators. Collaborators studied 4 extraction techniques and 2 calculation procedures. All methods showed acceptable recoveries and no significant differences between methods. Based on accuracy, simplicity and speed, the Celite extraction with internal standard calculation is recommended. Fifteen collaborators also studied a distillation confirmatory method compared with a direct extraction with dichloromethane. Because the former gives an extract more suitable for mass spectrometric confirmation of nitrosamines, it is the recommended reference method. The screening and confirmatory methods have been adopted official first action.

Metabolomic studies of Piperaceae species: a correlation between miniaturization and direct extraction strategies

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
AA Souza Júnior ◽  
LL Zanin ◽  
I Castro-Gamboa ◽  
M Furlan
Keyword(s):  
Direct Extraction

The Evolution of Lead Extraction

2009 ◽  
Vol 5 (1) ◽  
pp. 32
Author(s):  
Melanie Maytin ◽  
Laurence M Epstein ◽  
◽  
Keyword(s):  
Natural Selection ◽  
Lead Extraction ◽  
Significant Morbidity ◽  
Extraction Techniques ◽  
Extraction Technology ◽  
Device Management ◽  
Future Developments ◽  
The Past ◽  
New Methods ◽  
Life Threatening

Prior to the introduction of successful intravascular countertraction techniques, options for lead extraction were limited and dedicated tools were non-existent. The significant morbidity and mortality associated with these early extraction techniques limited their application to life-threatening situations such as infection and sepsis. The past 30 years have witnessed significant advances in lead extraction technology, resulting in safer and more efficacious techniques and tools. This evolution occurred out of necessity, similar to the pressure of natural selection weeding out the ineffective and highly morbid techniques while fostering the development of safe, successful and more simple methods. Future developments in lead extraction are likely to focus on new tools that will allow us to provide comprehensive device management and the design of new leads conceived to facilitate future extraction. With the development of these new methods and novel tools, the technique of lead extraction will continue to require operators that are well versed in several methods of extraction. Garnering new skills while remembering the lessons of the past will enable extraction technologies to advance without repeating previous mistakes.

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