نتایج جستجو برای: Polyether-diester

تعداد نتایج: 7434  

Aziz Shahrisa Reza Tabrizi

New macrocyclic polyether-diester ligands (3-5) containing the 4H-pyran-4-one subcyclic unit have been prepared by treating various glycols with dimethyl chelidonate (10). In the reaction of compound 10 with ethylene glycol and diethylene glycol, two noncyclic diester and tetraester (6-9) were produced in each case. The new marcocyclic ligand 4 formed stable complexes with benzylammonium pe...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 1999
aziz shahrisa reza tabrizi

new macrocyclic polyether-diester ligands (3-5) containing the 4h-pyran-4-one subcyclic unit have been prepared by treating various glycols with dimethyl chelidonate (10). in the reaction of compound 10 with ethylene glycol and diethylene glycol, two noncyclic diester and tetraester (6-9) were produced in each case. the new marcocyclic ligand 4 formed stable complexes with benzylammonium perchl...

Journal: :Journal of lipid research 1972
F H Mattson R A Volpenhein

The digestion in vitro by pancreatic lipase (EC 3.1.1.3) of the mono- and dioleate esters of hexane-1,6-diol has been studied. Under the conditions employed, the pathways for the lysis of these materials are proposed to be a hydrolysis step diester --> monoester + free fatty acid and a transesterification step 2 monoesters --> diester + free alcohol. If only the diester is present initially, it...

Journal: :Biotechnology and bioengineering 2001
H G Park H N Chang J S Dordick

A chemoenzymatic approach was developed to prepare sucrose-containing aromatic polymers. The protease from Bacillus licheniformis catalyzed the transesterification of sucrose with a diester of terephthalic acid in pyridine to give the mono- and diester products. At 45 degrees C, >70% of sucrose was consumed after 1 day and sucrose diester began to form after 6 days when >95% of sucrose had been...

Journal: :The Journal of clinical investigation 1984
G R Vandenbark L J Kuhn J E Niedel

The phorbol diesters are the most potent inducers of differentiation of the promyelocytic leukemia cell line, HL-60. Soluble phorbol diester receptors from HL-60 cells were obtained from the cytosolic fraction and from the particulate fraction by either divalent ion chelation or detergent extraction. The partially purified soluble phorbol diester receptors required exogenous Ca2+ and phospholip...

Journal: :The Journal of biological chemistry 1987
J R Gaut R A Carchman

As HL-60 cells matured along the granulocytic pathway, phorbol diester-induced superoxide anion production was compared to phorbol diester-induced protein phosphorylation using an in vitro phosphorylation technique. Maturation was induced by 0, 2, 4, or 6 days incubation with dimethyl sulfoxide (Me2SO). In 0 day Me2SO HL-60 cells, phorbol 12-myristate 13-acetate induced phosphorylation of prote...

2015
Wenzheng Wu Peng Geng Guiwei Li Di Zhao Haibo Zhang Ji Zhao

Fused deposition modeling (FDM) is a rapidly growing 3D printing technology. However, printing materials are restricted to acrylonitrile butadiene styrene (ABS) or poly (lactic acid) (PLA) in most Fused deposition modeling (FDM) equipment. Here, we report on a new high-performance printing material, polyether-ether-ketone (PEEK), which could surmount these shortcomings. This paper is devoted to...

2017
N. H. Williams

It is essential that the primary, linear structure of DNA is stable to preserve the sequence of bases and hence the genetic code. The bases are assembled as nucleotide units, joined together by phosphate diester links. Given the need to permanently retain genetic information, it is not surprising that the phosphate diester is far more kinetically stable than other common biological functional g...

Journal: :Green Chemistry 2021

Ethyl levulinate is readily ketalized with biobased pentaerythritol to form a spirocyclic diester monomer low GHG emissions produce series of fully aliphatic processable polyesters.

Journal: :The Analyst 2016
Siwei Yang Jing Sun Chong Zhu Peng He Zheng Peng Guqiao Ding

The graphene quantum dot based fluorescent probe community needs unambiguous evidence about the control on the ion selectivity. In this paper, polyethylene glycol modified N-doped graphene quantum dots (PN-GQDs) were synthesized by alkylation reaction between graphene quantum dots and organic halides. We demonstrate the tunable selectivity and sensitivity by controlling the supramolecular recog...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید