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Ambiguity of Reflexives and Case Extension
( Richard Zuber ) 한국언어정보학회 2007 학술대회 논문집 Vol.2007 No.-
It is suggested that the difference between co-referential and bound reflexive pronouns found in many languages can be accounted for by using the notion of the case extension of a type <1> quantifier. Given this proposal the co-referential pronouns get their meaning when the corresponding NP takes nominal case extension first. Bound reflexives are reflexivisers in the sense that they are not case extensions of quantifiers although they also transform binary relations into sets. Examples from Japanese and from Polish are discussed.
Blends of polyurethane-polymethyl methacrylate/TiO2-based composites
Mohammad Zuber,Shazia Tabasum,Rizwan Hussain,Muhammad Bilal Khan,Iftikhar Hussain Bukhari 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.8
Polyurethanes (PUs) prepolymer was prepared by the reaction of toluene-2,4-diisocyanate (TDI) and poly caprolactone diols and the chain was further extended with 1,4-butane diol (1,4-BDO) to get final polyurethane (PU). FTIR spectra of the monomers, PU prepolymer, chain extender and final PU confirmed the reaction progress. A series of blends were prepared by varying the percent compositions of prepared PU, procured polymethyl methacylates (PMMA)and titanium dioxide (TiO2). Pellets were formed from the prepared blends (PU-PMMA/TiO2) using a self-designed mechanical tool. Scanning electron microscope (SEM) images were also taken to confirm the incorporation of the TiO2contents into the prepared blends. Mechanical properties such as hardness and compressive strength were studied and discussed. The results of the study reveal that the blended sample having 80% PU, 20% PMMA content with 2.5 g TiO2 in 100 g mixture of PU and PMMA is very suitable for suggesting dental materials.
Mohammad Zuber,Fatima Mumtaz,Khalid Mahmood Zia,Tahir Jamil,Rizwan Hussain 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.12
Aqueous polyurethane dispersions (PUDs) have recently emerged as important alternatives to their solventbased counterparts for various applications due to increasing health and environmental awareness. A series of aqueous polyurethane dispersions containing carboxylate anion as hydrophilic pendant groups were synthesized through step growth polymerization reaction using hexamethylene diisocyanate (HDI), 1,4-butanediol (1,4-BDO), dimethylol propionic acid (DMPA) and polyethylene glycol (PEG) of different molecular weight. Effect of PEG molecular weight was investigated on molecular structure, contact angle measurement, and physical and adhesive properties of PU emulsions. Fourier transform infrared spectroscopy (FT-IR) was used to check the completion of polymerization reaction. Contact angle measurement indicated that the hydrophilicity of polymer increases by increasing molecular weight of PEG with a corresponding decrease in contact angle. Results of T-peel test showed a decrease in peel strength by increasing molecular weight of PEG. Moreover, solid contents%, drying time and storage stability suggested fast drying properties and greater stability of aqueous PU dispersions.
Mohammad Zuber,Khalid Mahmood Zia,Muhammad Ashair Iqbal,Zahida Tariq Cheema,Muhammad Ishaq,Tahir Jamil 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
The present research work was performed to study the properties of polyurethanes (PU) based on ali-phatic diisocayanate and the effect of chemical structure of chain extenders. Two series of PUs were synthesized via twosteps polymerization technique. The PU samples constituted on hexamethylene diisocayanate (HDI), hydroxy-termi-nated polybutadiene (HTPB) and blends 1, 4 butanediol (BDO)/bisphenol A (BPA) and or 1, 4 butanediol (BDO)/bisphenol S (BPS) were prepared. Structural characterization was done using Fourier transform infrared spectroscopyduring and after the synthesis. The FTIR analysis confirmed the existence of proposed bisphenol A (BPA) and bisphe-nol S (BPS) based PU structures. Differential scanning calorimeter (DSC) analysis gives information about the thermaltransition of all the polymer samples. Because of the difference of polarity between hard and soft segments of PU,microphase separation can occur. The degree of phase separation in the prepared PU was confirmed using scanningelectron microscope (SEM) technique. The SEM techniques present a distinctive chance to directly visualize the mor-phology of the polyurethanes.
Protein N-Glycosylation, Protein Folding, and Protein Quality Control
Roth, Jurgen,Zuber, Christian,Park, Su-Jin,Jang, In-Sook,Lee, Yang-Sin,Kysela, Katarina Gaplovska,Le Fourn, Valerie,Santimaria, Roger,Guhl, Bruno,Cho, Jin-Won Korean Society for Molecular and Cellular Biology 2010 Molecules and cells Vol.30 No.6
Quality control of protein folding represents a fundamental cellular activity. Early steps of protein N-glycosylation involving the removal of three glucose and some specific mannose residues in the endoplasmic reticulum have been recognized as being of importance for protein quality control. Specific oligosaccharide structures resulting from the oligosaccharide processing may represent a glycocode promoting productive protein folding, whereas others may represent glyco-codes for routing not correctly folded proteins for dislocation from the endoplasmic reticulum to the cytosol and subsequent degradation. Although quality control of protein folding is essential for the proper functioning of cells, it is also the basis for protein folding disorders since the recognition and elimination of non-native conformers can result either in loss-of-function or pathological-gain-of-function. The machinery for protein folding control represents a prime example of an intricate interactome present in a single organelle, the endoplasmic reticulum. Here, current views of mechanisms for the recognition and retention leading to productive protein folding or the eventual elimination of misfolded glycoproteins in yeast and mammalian cells are reviewed.
Hafiz Badaruddin Ahmad,Muhammad Zuber,Yasir Abbas,Mazhar Hussain,Naeem Akhtar,Tariq Mahmood Ansari,Khalid Mahmood Zia,Shafiq Ahmad Arain 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
Arsenic and nitrate are ill-famed environmental pollutants that are responsible for various lethal diseases. Their removal from drinking water is very essential. In present study, newly synthesized alumina supported nano zerovalentzinc (Alumina-nZvZ) has been tested to remove arsenic and nitrate. Quantitative analyses of arsenic have beenperformed spectrophotometrically and while that of nitrates ions colorimetrically. After optimization of time and amountof adsorbent, Langmuir, Freundlich and D-R isotherms were applied to determine different parameters for the assessmentof adsorption. Synthesized samples were characterized by scanning electron microscopy (SEM) to evaluate porosityand void size. Alumina coated with reduced ZnCl2 showed better efficiency for removal of arsenic and nitrate ions. Kinetics of adsorption was evaluated by using pseudo first-order and pseudo second-order rate equations.
Protein N-Glycosylation, Protein Folding, and Protein Quality Control
Jürgen Roth,Christian Zuber,박수진,Insook Jang,Yangsin Lee,Katarina Gaplovska Kysela,Valérie Le Fourn,Roger Santimaria,Bruno Guhl,조진원 한국분자세포생물학회 2010 Molecules and cells Vol.30 No.6
Quality control of protein folding represents a funda-mental cellular activity. Early steps of protein N-glycosylation involving the removal of three glucose and some specific mannose residues in the endoplasmic reticulum have been recognized as being of importance for protein quality control. Specific oligosaccharide structures resulting from the oligosaccharide processing may represent a glycocode promoting productive protein folding, whereas others may represent glyco-codes for routing not correctly folded proteins for dislocation from the endoplasmic reticulum to the cytosol and subsequent degradation. Although quality control of protein folding is essential for the proper functioning of cells, it is also the basis for protein folding disorders since the recognition and elimination of non-native conformers can result either in loss-of-function or pathological-gain-of-function. The machinery for protein folding control represents a prime example of an intricate interactome present in a single organelle, the endoplasmic reticulum. Here, current views of mechanisms for the recognition and retention leading to productive protein folding or the eventual elimination of misfolded glycoproteins in yeast and mammalian cells are reviewed.
Shazia Muzaffar,Ijaz Ahmad Bhatti,Mohammad Zuber,Haq Nawaz Bhatti,Muhammad Shahid 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
As the use of high performance textiles has grown, the need for chemical finishes to provide the fabric properties required in the special applications has grown accordingly. In this project, a series of water dispersible polyurethanes dispersion (CS-PUs) with multipurpose performance profile was developed using isophorone diisocyanate (IPDI), polyethylene glycol (PEG), 2,2-dimethylol propionic acid (DMPA) and chitosan (CS) for textile applications. In two step synthesis process, NCO functional PU prepolymers prepared by reacting IPDI, PEG, and DMPA were extended with varying molar quantities of chitosan followed by structural characterization through FTIR. The prepared CS-PU dispersions were applied onto the dyed and printed poly-cotton blend fabrics. The performance behavior of the treated fabric in terms of crease recovery, tear strength, tensile strength, and antibacterial properties was evaluated by applying standard test methods. These investigations show that the CS-PU dispersions can be applied as antibacterial textile finishes with significant improvement in the physical and mechanical properties of poly-cotton fabrics.