Hydrogenation-Assisted Graphene Origami and Its Application in Programmable Molecular Mass Uptake, Storage, and Release

ACS Nano ◽  
2014 ◽  
Vol 8 (3) ◽  
pp. 2864-2872 ◽  
Author(s):  
Shuze Zhu ◽  
Teng Li
Keyword(s):  
Molecular Mass ◽  
Mass Uptake

A general model for the diffusion and swelling of polymers and its application to ultra-high molecular mass polyethylene

1994 ◽  
Vol 444 (1921) ◽  
pp. 267-285 ◽  
Keyword(s):  
Molecular Mass ◽  
Numerical Scheme ◽  
Relative Magnitude ◽  
High Molecular Mass ◽  
Uptake Kinetics ◽  
Fickian Diffusion ◽  
One Dimensional ◽  
Mass Uptake ◽  
Sharp Concentration ◽  
Kinetics Of

A numerical scheme is described that can predict the diffusion and swelling of solvents into a one-dimensional polymer slab. The work extends previous models of non-fickian diffusion and incorporates both generalized fickian diffusion and a concentration dependent viscoelastic response of the polymer. Depending on the relative magnitude of different parameters, both broad and sharp concentration profiles are predicted, together with linear or t ½ mass uptake kinetics. The model is found to successfully predict the experimentally determined mass uptake kinetics of ultra-high molecular mass polyethylene exposed to an organic solvent at low and high temperatures. Significant solvent loadings are observed with linear kinetics at low temperature and t ½ kinetics at higher temperatures.

Detection of both Type 1 and Type 2 Plasminogen Activator Inhibitors in Human Monocytes

1990 ◽  
Vol 63 (01) ◽  
pp. 067-071 ◽  
Author(s):  
Joan C Castellote ◽  
Enric Grau ◽  
Maria A Linde ◽  
Nuria Pujol-Moix ◽  
Miquel LI Rutllant
Keyword(s):  
Molecular Mass ◽  
Plasminogen Activator ◽  
Human Peripheral Blood ◽  
Direct Interaction ◽  
Apparent Molecular Weight ◽  
Fibrinolytic System ◽  
Human Monocytes ◽  
Blood Monocytes ◽  
Single Chain ◽  
Sds Page

SummaryIncreasing evidence suggests the involvement of leukocytes in the fibrinolytic system. Monocytes secrete pro-urokinase (Grau, Thromb Res 1989; 53: 145) and it has been shown that these cells have specific receptors for urokinase and plasminogen (Miles, Thromb Haemostas 1987; 58: 936). The aim of this study was to analyse the presence of plasminogen activator inhibitor(s) in platelet-free suspensions of human peripheral blood monocytes and polymorphonuclear leukocytes (PMN). SDS-PAGE and reverse fibrin autography showed an inhibitory band of 50 kDa in the monocyte extracts (Triton X-100) but not in the PMN extracts. Urokinase (u-PA) was mixed with increasing amounts of monocyte extract for 10 min and the mixtures were added to 125Ifibrin coated wells containing plasminogen. A dose-dependent decrease in the u-PA fibrinolytic activity was observed. The amount of inhibition increased when the monocyte releasates were preincubated with u-PA (40% inhibition after 5 min preincubation and 80% after 15 min), indicating a direct interaction between this activator and an inhibitor(s). After SDS-PAGE of monocyte extracts, immunoblotting and peroxidase staining identified both PAI1 and PAI2, with an apparent molecular weight of 47-50 kDa. Monocyte-associated PAI1 formed complexes with single chain t-PA with a molecular mass 50 kDa higher than the molecular mass of the free PAI1. However, a significant amount of PAI remained unbound to t-PA. This inactive PAI1 could have come from a rapid inactivation of the primary active PAI1. These PAI1 and PAI2 detected in human monocytes may be transcendent in the regulation of the fibrinolytic system.

Characterization of dissolved material during the initial phase of softwood kraft pulping

TAPPI Journal ◽  
2013 ◽  
Vol 12 (1) ◽  
pp. 37-43 ◽  
Author(s):  
HANNU PAKKANEN ◽  
TEEMU PALOHEIMO ◽  
RAIMO ALÉN
Keyword(s):  
Mass Transfer ◽  
Molecular Mass ◽  
Initial Phase ◽  
Degradation Products ◽  
Kraft Pulping ◽  
Reaction Products ◽  
Cooking Temperature ◽  
Molecular Masses ◽  
Aliphatic Carboxylic Acids

The influence of various cooking parameters, such as effective alkali, cooking temperature, and cooking time on the formation of high molecular mass lignin-derived and low molecular mass carbohydrates-derived (aliphatic carboxylic acids) degradation products, mainly during the initial phase of softwood kraft pulping was studied. In addition, the mass transfer of all of these degradation products was clarified based on their concentrations in the cooking liquor inside and outside of the chips. The results indicated that the degradation of the major hemicellulose component, galactoglucomannan, typically was dependent on temperature, and the maximum degradation amount was about 60%. In addition, about 60 min at 284°F (140°C) was needed for leveling off the concentrations of the characteristic reaction products (3,4-dideoxy-pentonic and glucoisosaccharinic acids) between these cooking liquors. Compared with low molecular mass aliphatic acids, the mass transfer of soluble lignin fragments with much higher molecular masses was clearly slower.

Development of simple models for agrichemical uptake into plant foliage

2003 ◽  
Vol 56 ◽  
pp. 61-65
Author(s):  
J.A. Zabkiewicz ◽  
W.A. Forster
Keyword(s):  
Vicia Faba ◽  
Initial Dose ◽  
Plant Leaves ◽  
Linear Relationships ◽  
Plant Foliage ◽  
Mass Uptake ◽  
Uptake Mechanisms ◽  
Simple Models

Pesticide uptake into plants is typically reported as percentage uptake of the amount applied but in studies of the mechanism of cuticular penetration this approach has not been helpful It can be shown that relating percentage uptake to initial dose of bentazone applied to Vicia faba foliage cannot provide pertinent relationships that can be used to explain cuticular uptake mechanisms However applying the principles of Ficks Law and using mass or molar quantities does provide excellent linear relationships between mass uptake and initial dose applied Universal equations can be derived that relate dose uptake to initial dose applied onto plant leaves

BIOCOMPATIBILITY OF BIODEGRADATED POLYMER MEMBRANES BASED ON POLYGLYCOLIDLACTIDE OF VARIOUS MOLECULAR MASS

2018 ◽  
Author(s):  
A.S. Baikin ◽  
◽  
M. A. Sevostyanov ◽  
E.O. Nasakina ◽  
K.V. Sergienko ◽  
...  
Keyword(s):  
Molecular Mass ◽  
Polymer Membranes
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