Structure-propery relationship of low molecular weight ‘liquid’ polymers in blends of sulfur cured SSBR-rich compounds

2020 ◽  
Vol 87 ◽  
pp. 106558 ◽  
Author(s):  
M. Gruendken ◽  
M. Martinez Velencoso ◽  
K. Hirata ◽  
A. Blume
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Liquid Polymers ◽  
Relationship Of

Design of Low Molecular Weight Hematoregulatory Agents from the Structure−Activity Relationship of a Dimeric Pentapeptide

1997 ◽  
Vol 40 (18) ◽  
pp. 2876-2882 ◽  
Author(s):  
Alan S. Cuthbertson ◽  
Mette Husbyn ◽  
May Engebretsen ◽  
Michael Hartmann ◽  
Meinolf Lange ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Low Molecular Weight ◽  
Structure Activity ◽  
Relationship Of

Relationship of Oxygen to the Activity of GR-S Reclaiming Agents

1955 ◽  
Vol 28 (1) ◽  
pp. 308-321
Author(s):  
R. B. Bennett ◽  
G. E. P. Smith
Keyword(s):  
Molecular Weight ◽  
Oxygen Content ◽  
Low Molecular Weight ◽  
Constant Amount ◽  
Experimental Conditions ◽  
Physical Conditions ◽  
Subsequent Exposure ◽  
Relationship Of

Abstract 1. An alkylphenol sulfide reclaiming agent was found to have little activity in the absence of oxygen ; conversely oxygen produced little activity without the reclaiming agent. Together, the oxygen and reclaiming agent showed exceptional activity in attacking a sulfur-cured GR-S gum vulcanizate to produce soluble, low molecular-weight fragments under relatively mild experimental conditions. 2. The solubilizing effects of oxygen with reclaiming oils and the alkylphenol sulfide reclaiming agent were produced without significant increase of the amount of combined oxygen in the acetone or chloroform insoluble portions of the vulcanizate. Large increases of oxygen content were produced quickly by subsequent exposure of the treated and extracted samples to an atmosphere of oxygen. 3. No significant quantity of combined sulfur was removed under experimental conditions involving an excess of liquid reclaiming oils and agents. However, a significant, constant amount of sulfur was removed under conditions in which only small amounts of the reclaiming oils and agents were carried on the surface of the ground vulcanizates. This loss of sulfur was independent of both oxygen and of reclaiming aid and appeared to depend solely on the type of stock and on the physical conditions employed.

Characterization of Low Molecular Weight Hydrocarbons in Jingbian Gas Field and its Application to Gas Sources Identification

2011 ◽  
Vol 29 (6) ◽  
pp. 777-795 ◽  
Author(s):  
Guoyi Hu ◽  
Shuichang Zhang
Keyword(s):  
Molecular Weight ◽  
Stable Carbon Isotopes ◽  
Ordos Basin ◽  
Low Molecular Weight ◽  
Gas Field ◽  
Average Value ◽  
Weathered Crust ◽  
Relationship Of ◽  
Compound Specific Carbon Isotope ◽  
Coal Measures

Chemical and isotopic compositions of C6-C7 low molecular weight hydrocarbons (LMWHs) were used to determine the origin of gas in the Ordovician weathered crust (O1m5) reservoir of Jingbian gas field in Ordos Basin, China. GC quantification of LMWHs for 55 gas samples [20 of them from the Xiashihezi Formation (P1x) and Shanxi Formation (P1s) reservoirs, and the rest from the O1m5 reservoir] were conducted. The compound specific stable carbon isotopes of LMWHs for 24 gas samples (five gas samples from the P1s reservoir) were analyzed with GC-C-IRMS. The results show that cycloalkanes are abundant components and their concentrations range from 23.8–52.5% with an average of 41.1% among LMWHs. Methylcyclohexane (MCH) is the most abundant one among normal heptane ( n-C7), MCH and dimethylcyclopentane (DMCP), ranging from 50.1–81.4% with an average value of 71.6%. A13C enrichment for nine compounds of C6-C7 fraction was observed, and the δ13C values range from −25.4–16.3%. Based on the correlation of the Mango parameters (K1 and K2), the relationship of n-C7, MCH and DMCP and compound specific carbon isotope of C6-C7 compounds, the gas in the O1m5 reservoir shares the same origin with that in the P1x, P1s reservoirs, the natural gas in Ordovician weathered crust reservoir and Permian sandstone reservoir sourced from coal measures in Carboniferous and Permian.

Catabolism of Fibrinogen and its Derivatives

1977 ◽  
Vol 38 (04) ◽  
pp. 0809-0822 ◽  
Author(s):  
Laurence A. Sherman
Keyword(s):  
Experimental Data ◽  
Molecular Weight ◽  
Degradation Products ◽  
Reticuloendothelial System ◽  
Hepatic Uptake ◽  
Low Molecular Weight ◽  
Cell Membrane Binding ◽  
Relationship Of ◽  
The Relationship

SummaryAlthough the site and manner of normal catabolism of most of the fibrinogen pool is uncertain, certain pathways have been defined for various fibrinogen derivatives. Several organs, including the kidneys and reticuloendothelial system (RES) have been directly implicated as catabolic sites for various fibrinogen derivatives. The catabolic sites are not the same for different derivatives. These differences in catabolism are probably in part related to biochemical differences between fibrinogen and its various derivatives. Fibrinogen itself may be catabolized in endothelial cells, although little experimental data is available. RES uptake of intact fibrinogen does not occur, and removal of sialic acid does not result in the rapid hepatic uptake seen with other desialop rote ins. In contrast, a variety of studies have shown that fibrin is taken up by the RES by at least 2 mechanisms. The first is phagocytosis of microparticulate fibrin. The second involves a RES cell membrane binding of soluble fibrin which remains soluble in the blood, when complexed to fibrinogen or degradation products. Fibrinogen degradation products alone may in part also be cleared in the RES. Fragments D and E appear to be catabolized in the kidney, although both the intrarenal site of catabolism and the means of cellular uptake is unknown. It is clear that normally there is no urinary excretion of D and E. Another fibrinogen derivative, low molecular weight clottable fraction 1–8, is derived in vivo from intact fibrinogen. 1–8 is found normally in the blood and has a shorter t ½ than fibrinogen although much longer than D and E. While originally thought to be the result of limited plasmin degradation, 1–8 may be the result of another type of proteolysis. The sites of both 1–8 formation and degradation are unknown. Catabolism via fibrin, 1–8, or D and E appears to be only a small percent of normal turnover, albeit of much greater significance in disease. The relationship of these pathways to the as yet unknown catabolic site for the bulk of normal fibrinogen remains to be determined.

Assessment of venous thromboembolism treatment in patients with cancer on low molecular weight heparin, warfarin, and the direct oral anticoagulants

2017 ◽  
Vol 25 (2) ◽  
pp. 261-268 ◽  
Author(s):  
Ellen M Uppuluri ◽  
Kelly R Burke ◽  
Christina Mactal Haaf ◽  
Nancy L Shapiro
Keyword(s):  
Molecular Weight ◽  
Venous Thromboembolism ◽  
Low Molecular Weight Heparin ◽  
Oral Anticoagulants ◽  
Direct Oral Anticoagulants ◽  
Low Molecular Weight ◽  
Bleeding Events ◽  
Safety And Efficacy ◽  
Patients With Cancer ◽  
Relationship Of

Background Direct oral anticoagulants (DOACs) are not recommended for venous thromboembolism (VTE) treatment in patients with cancer because their safety and efficacy have not been compared to low molecular weight heparin (LMWH) in large trials. Routine anti-Xa monitoring in cancer patients on LMWH is also not recommended due to limited data correlating anti-Xa levels and outcomes. Objective Compare the safety and efficacy of DOACs to LMWH and warfarin and assess the relationship of anti-Xa monitoring and outcomes in patients with cancer taking LMWH in an urban university setting. Methods This retrospective, cohort study analyzed the recurrence of VTE and number of bleeding events in patients with cancer. Results There were 131 patients included in the analysis. There was no difference seen in the rate of recurrent VTEs between the LMWH, warfarin and DOAC groups (9.3%, 5.9%, 9.1%, p = 0.89). There was also no difference in the rate of bleeding between groups (10.5%, 14.7%, 9.1%, p = 0.576). There was an increased rate of mortality seen in the LMWH group (26.7% vs. 2.9% vs. 18.2%, p = 0.006). There was no difference seen in recurrent VTE (10.3% vs. 8.5%, p = 0.53) or bleeding (10.3% vs. 10.7%, p = 0.661) between the monitored and unmonitored LMWH patients. Conclusion Results of this analysis suggest DOACs may be as safe and effective as LMWH and warfarin for the treatment of VTE in patients with cancer, and there may be no clinical benefit to routine anti-Xa monitoring in patients on LMWH treatment. However, larger studies are needed to confirm these observations.

scholarly journals Spatial Relationship of Metabolomics, Osa and Diabetes Mellitus

2018 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Diabetes Mellitus ◽  
Molecular Weight ◽  
Sleep Latency ◽  
Spatial Relationship ◽  
Body Fluids ◽  
Metabolic Changes ◽  
Low Molecular Weight ◽  
Sleep Phase ◽  
Obesity And Diabetes ◽  
Relationship Of

Metabolomics is the study of metabolites, targeted or untargeted. They can be analyzed from body fluids like urine, blood, saliva. They are of low molecular weight (<1KD). These reflect the process involved in the metabolism. The targeted one is restricted to the known metabolites. The untargeted identifies unknown metabolites, known as Metabolomes. Sleep is triphasic consisting of Sleep Latency, synchronized sleep phase (SWS) and Rapid eye moment (REM) phase. This is essentially marshaled by neuro hormonal and metabolic changes.. Several disorders of sleep and associated hormonal imbalances can result in obesity and Diabetes Mellitus. Thus the abnormal metabolimic facsimile can reflect of this patho physiological process. The study of metabolites may pay an inexpensive way to diagnose this problem in future, fortifying or replacing Polysomnography.

scholarly journals Temporal relationship of autophagy and apoptosis in neurons challenged by low molecular weight β-amyloid peptide

2011 ◽  
Vol 15 (2) ◽  
pp. 244-257 ◽  
Author(s):  
Yuen-Ting Cheung ◽  
Natalie Qishan Zhang ◽  
Clara Hiu-Ling Hung ◽  
Cora Sau-Wan Lai ◽  
Man-Shan Yu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Temporal Relationship ◽  
Amyloid Peptide ◽  
Low Molecular Weight ◽  
Β Amyloid ◽  
Β Amyloid Peptide ◽  
Relationship Of
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