Classification of foam and foaming products for EPB mechanized tunnelling based on half-life time

2019 ◽  
Vol 92 ◽  
pp. 103044 ◽  
Author(s):  
Diego Sebastiani ◽  
Giorgio Vilardi ◽  
Irene Bavasso ◽  
Luca Di Palma ◽  
Salvatore Miliziano
Keyword(s):  
Half Life ◽  
Life Time ◽  
Mechanized Tunnelling

Covalent Complexes Between Low Molecular Weight Heparin Fragments and Antithrombin III – Inhibition Kinetics and Turnover Parameters

1983 ◽  
Vol 49 (02) ◽  
pp. 109-115 ◽  
Author(s):  
M Hoylaerts ◽  
E Holmer ◽  
M de Mol ◽  
D Collen
Keyword(s):  
Molecular Weight ◽  
Half Life ◽  
Low Molecular Weight Heparin ◽  
Antithrombin Iii ◽  
Factor Xa ◽  
Life Time ◽  
Low Molecular Weight ◽  
High Affinity ◽  
Plasma Half Life ◽  
Covalent Complex

SummaryTwo high affinity heparin fragments (A/r 4,300 and M, 3,200) were covalently coupled to antithrombin III (J. Biol. Chem. 1982; 257: 3401-3408) with an apparent 1:1 stoichiometry and a 30-35% yield.The purified covalent complexes inhibited factor Xa with second order rate constants very similar to those obtained for antithrombin III saturated with these heparin fragments and to that obtained for the covalent complex between antithrombin III and native high affinity heparin.The disappearance rates from plasma in rabbits of both low molecular weight heparin fragments and their complexes could adequately be represented by two-compartment mammillary models. The plasma half-life (t'/j) of both low Afr-heparin fragments was approximately 2.4 hr. Covalent coupling of the fragments to antithrombin III increased this half-life about 3.5 fold (t1/2 ≃ 7.7 hr), approaching that of free antithrombin III (t1/2 ≃ 11 ± 0.4 hr) and resulting in a 30fold longer life time of factor Xa inhibitory activity in plasma as compared to that of free intact heparin (t1/2 ≃ 0.25 ± 0.04 hr).

Simultaneous optimization of activity and stability of xylose reductase from D. nepalensis NCYC 3413 using statistical experimental design

2020 ◽  
Vol 27 ◽  
Author(s):  
Shwethashree Malla ◽  
Sathyanarayana N. Gummadi
Keyword(s):  
Half Life ◽  
Specific Activity ◽  
Enzyme Stability ◽  
Reductase Activity ◽  
Xylose Reductase ◽  
Life Time ◽  
Economic Feasibility ◽  
Simultaneous Optimization ◽  
Physical Parameters ◽  
Statistical Experimental Design

Background: Physical parameters like pH and temperature play a major role in the design of an industrial enzymatic process. Enzyme stability and activity are greatly influenced by these parameters; hence optimization and control of these parameters becomes a key point in determining the economic feasibility of the process. Objective: This study was taken up with the objective to optimize physical parameters for maximum stability and activity of xylose reductase from D. nepalensis NCYC 3413 through separate and simultaneous optimization studies and comparison thereof. Method: Effects of pH and temperature on the activity and stability of xylose reductase from Debaryomyces nepalensis NCYC 3413 were investigated by enzyme assays and independent variables were optimised using surface response methodology. Enzyme activity and stability were optimised separately and concurrently to decipher the appropriate conditions. Results: Optimized conditions of pH and temperature for xylose reductase activity were determined to be 7.1 and 27 ℃ respectively, with predicted responses of specific activity (72.3 U/mg) and half-life time (566 min). The experimental values (specific activity 50.2 U/mg, half-life time 818 min) were on par with predicted values indicating the significance of the model. Conclusion: Simultaneous optimization of xylose reductase activity and stability using statistical methods is effective as compared to optimisation of the parameters separately.

Radical Intermediates in Photochemical and Redox Initiated Decomposition of Thioazo Compounds(an EPR and Cyclovoltammetric Study)

1997 ◽  
Vol 62 (6) ◽  
pp. 855-865 ◽  
Author(s):  
Katarína Erentová ◽  
Vladimír Adamčík ◽  
Andrej Staško ◽  
Oskar Nuyken ◽  
Arming Lang ◽  
...  
Keyword(s):  
Decomposition Rate ◽  
Half Life ◽  
Spin Trap ◽  
Solvent Molecule ◽  
Life Time ◽  
Radical Intermediates ◽  
Reactive Radicals ◽  
Induced Decomposition

The cathodically and photochemically induced decomposition of thioazo compounds XC6H4-N2-S-C6H4CH3 and their polymers with X = NO2, COOH, and SO3H were investigated. The formation of carbon-centered XC6H4. and sulfur-centered .S-C6H4Y radicals was confirmed using spin-trap technique. These reactive radicals either abstract hydrogen from CH3CN solvent molecule forming .CH2CN radical or they recombine to cage products XC6H4-S-C6H4CH3 eliminating N2. The decomposition rate of the investigated thioazo compounds is characterized by a formal half-life time of 5 to 10 s.

scholarly journals Grasses and legumes as cover crop in no-tillage system in northeastern Pará Brazil

2014 ◽  
Vol 44 (4) ◽  
pp. 411-418 ◽  
Author(s):  
Renato Alves Teixeira ◽  
Tatiana Gazel Soares ◽  
Antonio Rodrigues Fernandes ◽  
Anderson Martins de Souza Braz
Keyword(s):  
Half Life ◽  
Dry Matter ◽  
C:N Ratio ◽  
Life Time ◽  
Dry Matter Production ◽  
Agricultural Systems ◽  
Climate Conditions ◽  
Jack Bean ◽  
No Till ◽  
Matter Production

Studies to select one or more species of coverage plants adapted to Amazonian soil and climate conditions of the Amazon are a promising strategy for the improvement of environmental quality, establishing no-till agricultural systems, and thereby reducing the impacts of monoculture farming. The aim of this study was to assess the persistence time, half-life time, macronutrient content and accumulation, and C:N ratio of straw coverage in a Ultisol in northeastern Pará. Experimental design was randomized blocks with five treatments and five replicates. Plants were harvested after 105 days, growth and biomass production was quantified. After 84 days, soil coverage was 97, 85, 52, 50, and 15% for signalgrass (Brachiaria brizantha) (syn. Urochloa), dense crowngrass (Panicum purpurascens), jack bean (Canavalia ensiformes), pearl millet (Pennisetum americanum) and sunn hemp (Crotalaria juncea,), respectively. Signalgrass yielded the greatest dry matter production (9,696 kg ha-1). It also had high C:N ratio (38.4), long half-life (86.5 days) and a high persistence in the field. Jack bean also showed high dry matter production (8,950 kg ha-1), but it had low C:N ratio (17.4) and lower half-life time (39 days) than the grasses. These attributes indicate that signalgrass and jack bean have a high potential for use as cover plants in no-till agricultural systems in the State of Pará.

scholarly journals Treatment of Joint-Bleedings in Hemophiliacs with Antibodies to Factor VIII with High doses of Fraction Feiba.

1977 ◽  
Author(s):  
Kl. Schimpf ◽  
K. Zimmermann ◽  
P. Zeltsch
Keyword(s):  
Knee Joint ◽  
Factor Viii ◽  
Half Life ◽  
Clinical Effect ◽  
Single Injection ◽  
Life Time ◽  
Joint Effusion ◽  
The Third ◽  
Inhibitor Level ◽  
High Doses

Observations in 3 patients demonstrated, that joint-bleedings can be controlled with high doses of fraction FEIBA alone or in combination with factor (f) VIII on out-patient basis. First patient, inhibitor 5-10 units (u) per ml, suffered from 24 joint-bleedings within 392 days. 2o of them could be stopped by a single injection of 150-200 u of fraction FEIBA per kg bodyweight (bw). A combination of 90 u of FEIBA and 36 u of f VIII per kg bw had the same effect. But after 5 injections of this combination within 6 weeks, the inhibitor level had risen from 10 to 240 u per ml. During further treatment with 180 u of fraction FEIBA without addition of f VIII, the inhibitor fell down with a half life time of 50 days. The clinical effect of fraction FEIBA was not influenced by the elevated antibody level. Two further patients, inhibitors 2-4 and 32 u respectively, obtained combined injections of 50-100 u of FEIBA plus 36-42 u of f VIII. One patient was on a prophylaxis of 3 injections weekly for 193 days. After 57 injections the inhibitor had fallen from 2-4 u to unmeasurable values. The third patient obtained the above mentioned dosis twice a day for treatment of a knee joint effusion. After 1 week the inhibitor was diminished from 32 to 13 u.

Half-life Time

2013 ◽  
pp. 876-876 ◽  
Author(s):  
Jean Clairambault
Keyword(s):  
Half Life ◽  
Life Time

Information Based Universal Feature Extraction in Shallow Networks

2017 ◽  
Vol 31 (06) ◽  
pp. 1755009 ◽  
Author(s):  
Mohammad Amiri ◽  
Rüdiger Brause
Keyword(s):  
Life Time ◽  
Image Feature ◽  
Visual Objects ◽  
Learning Tasks ◽  
Universal Feature ◽  
Learning Constraints ◽  
And Performance ◽  
Crucial Part ◽  
World Image

In many real-world image based pattern recognition tasks, the extraction and usage of task-relevant features are the most crucial part of the diagnosis. In the standard approach, either the features are given by common sense like edges or corners in image analysis, or they are directly determined by expertise. They mostly remain task-specific, although human may learn the life time, and use different features too, although same features do help in recognition. It seems that a universal feature set exists, but it is not yet systematically found. In our contribution, we try to find such a universal image feature set that is valuable for most image related tasks. We trained a shallow neural network for recognition of natural and non-natural object images before different backgrounds, including pure texture and handwritten digits, using a Shannon information-based algorithm and learning constraints. In this context, the goal was to extract those features that give the most valuable information for classification of the visual objects, hand-written digits and texture datasets by a one layer network and then classify them by a second layer. This will give a good start and performance for all other image learning tasks, implementing a transfer learning approach. As result, in our case we found that we could indeed extract unique features which are valid in all three different kinds of tasks. They give classification results that are about as good as the results reported by the corresponding literature for the specialized systems, or even better ones.

Half-life time of ozone as a function of air movement and conditions in a sealed container

2013 ◽  
Vol 55 ◽  
pp. 41-47 ◽  
Author(s):  
Janie D. McClurkin ◽  
Dirk E. Maier ◽  
Klein E. Ileleji
Keyword(s):  
Half Life ◽  
Life Time ◽  
Air Movement
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