Asymmetric Metallocene Catalysts Based on Dibenzothiophene:  A New Approach to High Molecular Weight Polypropylene Plastomers

2003 ◽  
Vol 22 (17) ◽  
pp. 3495-3501 ◽  
Author(s):  
Sandra Deisenhofer ◽  
Tanja Feifel ◽  
Jürgen Kukral ◽  
Martti Klinga ◽  
Markku Leskelä ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Metallocene Catalysts ◽  
New Approach

High-Molecular-Weight Atactic Polypropylene from Metallocene Catalysts. 1. Me2Si(9-Flu)2ZrX2(X = Cl, Me)

1996 ◽  
Vol 15 (3) ◽  
pp. 998-1005 ◽  
Author(s):  
Luigi Resconi ◽  
Robert L. Jones ◽  
Arnold L. Rheingold ◽  
Glenn P. A. Yap
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Metallocene Catalysts ◽  
Atactic Polypropylene

A new approach to prepare high molecular weight poly(p-dioxanone) by chain-extending from dihydroxyl terminated propolymers

2008 ◽  
Vol 44 (2) ◽  
pp. 465-474 ◽  
Author(s):  
Qiang Zeng ◽  
Ke-Ke Yang ◽  
Si-Chong Chen ◽  
Xiu-Li Wang ◽  
Jian-Bing Zeng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
New Approach ◽  
High Molecular Weight Poly

Copolymers of Ethylene and Vinyl Amino Acidic Ester with High Molecular Weight Prepared by Non-metallocene Catalysts

2016 ◽  
Vol 146 (3) ◽  
pp. 609-619 ◽  
Author(s):  
Jing Wang ◽  
Feng Nan ◽  
Jiangping Guo ◽  
Jian Wang ◽  
Xianghui Shi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Metallocene Catalysts

Microtubule motors and other maps

1990 ◽  
Vol 48 (3) ◽  
pp. 1-1
Author(s):  
Richard B. Vallee
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Cytoplasmic Dynein ◽  
Organelle Transport ◽  
Structural Components ◽  
Microtubule Associated Proteins ◽  
Microtubule Motors ◽  
Associated Proteins ◽  
The Subject ◽  
Intracellular Motility

Microtubules are involved in a number of forms of intracellular motility, including mitosis and bidirectional organelle transport. Purified microtubules from brain and other sources contain tubulin and a diversity of microtubule associated proteins (MAPs). Some of the high molecular weight MAPs - MAP 1A, 1B, 2A, and 2B - are long, fibrous molecules that serve as structural components of the cytamatrix. Three MAPs have recently been identified that show microtubule activated ATPase activity and produce force in association with microtubules. These proteins - kinesin, cytoplasmic dynein, and dynamin - are referred to as cytoplasmic motors. The latter two will be the subject of this talk.Cytoplasmic dynein was first identified as one of the high molecular weight brain MAPs, MAP 1C. It was determined to be structurally equivalent to ciliary and flagellar dynein, and to produce force toward the minus ends of microtubules, opposite to kinesin.

Studies on the Functionality of Newly Synthesized Fibrinogen after Treatment of Acute Myocardial Infarction with Streptokinase, Increase in the Rate of Fibrinopeptide Release

1993 ◽  
Vol 70 (06) ◽  
pp. 0978-0983 ◽  
Author(s):  
Edelmiro Regano ◽  
Virtudes Vila ◽  
Justo Aznar ◽  
Victoria Lacueva ◽  
Vicenta Martinez ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Molecular Weight ◽  
Steady State ◽  
High Molecular Weight ◽  
Coronary Arteries ◽  
Risk Index ◽  
Weight Fraction ◽  
High Molecular Weight Fraction ◽  
Fibrinopeptide A

SummaryIn 15 patients with acute myocardial infarction who received 1,500,000 U of streptokinase, the gradual appearance of newly synthesized fibrinogen and the fibrinopeptide release during the first 35 h after SK treatment were evaluated. At 5 h the fibrinogen circulating in plasma was observed as the high molecular weight fraction (HMW-Fg). The concentration of HMW-Fg increased continuously, and at 20 h reached values higher than those obtained from normal plasma. HMW-Fg represented about 95% of the total fibrinogen during the first 35 h. The degree of phosphorylation of patient fibrinogen increased from 30% before treatment to 65% during the first 5 h, and then slowly declined to 50% at 35 h.The early rates of fibrinopeptide A (FPA) and phosphorylated fibrinopeptide A (FPAp) release are higher in patient fibrinogen than in isolated normal HMW-Fg and normal fibrinogen after thrombin addition. The early rate of fibrinopeptide B (FPB) release is the same for the three fibrinogen groups. However, the late rate of FPB release is higher in patient fibrinogen than in normal HMW-Fg and normal fibrinogen. Therefore, the newly synthesized fibrinogen clots faster than fibrinogen in the normal steady state.In two of the 15 patients who had occluded coronary arteries after SK treatment the HMW-Fg and FPAp levels increased as compared with the 13 patients who had patent coronary arteries.These results provide some support for the idea that an increased synthesis of fibrinogen in circulation may result in a procoagulant tendency. If this is so, the HMW-Fg and FPAp content may serve as a risk index for thrombosis.

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