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Heterogeneous catalysis on chitosan
... controls polymer hydration, which in turn determines the accessibility to internal sites [51–54]. This parameter strongly influences the kinetics of hydration and sorption [55–57]. The dissolving of the polymer breaks the hydrogen bond between polymer chains. The reduced polymer crystallinity can be ...
... controls polymer hydration, which in turn determines the accessibility to internal sites [51–54]. This parameter strongly influences the kinetics of hydration and sorption [55–57]. The dissolving of the polymer breaks the hydrogen bond between polymer chains. The reduced polymer crystallinity can be ...
reactivity of heterocyclic compounds
... 1.- From 1,4-dicarbonyl compounds (Paal-Knorr synthesis): Generally Substituted pyrrole may be synthesized through the cyclization of 1,4-diketones in combination with ammonia (NH3) or amines, The ring-closure is proceeded by dehydration (condensation), which then yields the two double bonds and thu ...
... 1.- From 1,4-dicarbonyl compounds (Paal-Knorr synthesis): Generally Substituted pyrrole may be synthesized through the cyclization of 1,4-diketones in combination with ammonia (NH3) or amines, The ring-closure is proceeded by dehydration (condensation), which then yields the two double bonds and thu ...
Full Text
... are involved in various cellular processes, including signal transmission (Mythreye and Blobe 2009; Schaefer and Schaefer 2010), immune response (Chen et al. 2008; Marth and Grewal 2008), bacterial pathogenesis (Boneca 2005), and cancer progression (Vlodavsky et al. 2007; Iozzo et al. 2009). Polysac ...
... are involved in various cellular processes, including signal transmission (Mythreye and Blobe 2009; Schaefer and Schaefer 2010), immune response (Chen et al. 2008; Marth and Grewal 2008), bacterial pathogenesis (Boneca 2005), and cancer progression (Vlodavsky et al. 2007; Iozzo et al. 2009). Polysac ...
- Free Documents
... both cases the CO bond lengths clearly indicate that CO is in fact a double bond. which are a wellknown class of predominantly thermochromic compounds. namely thermochromism and photochromism . while the CN bond lengths show that CN bonds are single tures are then reported as zwitterions instead of ...
... both cases the CO bond lengths clearly indicate that CO is in fact a double bond. which are a wellknown class of predominantly thermochromic compounds. namely thermochromism and photochromism . while the CN bond lengths show that CN bonds are single tures are then reported as zwitterions instead of ...
Chapter 2 - University of Amsterdam
... asymmetric hydroformylation the most promising class of ligands are hybrid phosphine and phosphite or phosphoramidite.3 A real breakthrough in this field was achieved by Takaya and Nozaki with the discovery of Binaphos, giving ee’s up to 95 % for a wide range of substrates.4 The reason for the excep ...
... asymmetric hydroformylation the most promising class of ligands are hybrid phosphine and phosphite or phosphoramidite.3 A real breakthrough in this field was achieved by Takaya and Nozaki with the discovery of Binaphos, giving ee’s up to 95 % for a wide range of substrates.4 The reason for the excep ...
High-temperature equilibrium isotope fractionation of non
... mineral isotope fractionations for a variety of major rock-forming in the laboratory and in the field over the last decade have shown that simple crystal chemical considerations can be used to predict the signs and rough magnitudes of inter-mineral isotope fractionation. In this review we focus on ad ...
... mineral isotope fractionations for a variety of major rock-forming in the laboratory and in the field over the last decade have shown that simple crystal chemical considerations can be used to predict the signs and rough magnitudes of inter-mineral isotope fractionation. In this review we focus on ad ...
NAD+-dependent formate dehydrogenase. From a model enzyme to
... from various sectors of life sciences community ranging from quantum chemists to biotechnologists as NAD+-dependent formate dehydrogenase (EC 1.2.1.2; FDH). First discovered in 1950-1951 [1,2] it has not attracted much interest until the middle of seventies of the last century when a problem of cofa ...
... from various sectors of life sciences community ranging from quantum chemists to biotechnologists as NAD+-dependent formate dehydrogenase (EC 1.2.1.2; FDH). First discovered in 1950-1951 [1,2] it has not attracted much interest until the middle of seventies of the last century when a problem of cofa ...
Theoretical studies on pyridoxal 5’-phosphate- catalyzed reactions of biological relevance 2014
... question the possibility of life formation when considering the age of the Earth (~4.5 billion years). However, taking into account the number of residues of each protein and the average number of proteins in the cell, such chemical lifetimes are necessary to prevent spontaneous degradation of prote ...
... question the possibility of life formation when considering the age of the Earth (~4.5 billion years). However, taking into account the number of residues of each protein and the average number of proteins in the cell, such chemical lifetimes are necessary to prevent spontaneous degradation of prote ...
Bio-Rad® Nuvia™ IMAC Resin
... Protein adsorption to immobilized ions is performed around neutral to slightly alkaline pH conditions (pH 7.0–8.0). To reduce nonspecific ionic effects, concentrations of up to 1 M NaCl may be added to the binding solution. Recombinant 6x histidine tags, located at either the amino or carboxyl termi ...
... Protein adsorption to immobilized ions is performed around neutral to slightly alkaline pH conditions (pH 7.0–8.0). To reduce nonspecific ionic effects, concentrations of up to 1 M NaCl may be added to the binding solution. Recombinant 6x histidine tags, located at either the amino or carboxyl termi ...
- BioMedSearch
... results presented in this paper provide evidence for the existence of another level of regulation of PEPS activity. The PSRP-dependent regulatory mechanism may be critical in controlling the metabolic direction of pyruvate in the cell, either towards the oxidative catabolism of pyruvate via the pyru ...
... results presented in this paper provide evidence for the existence of another level of regulation of PEPS activity. The PSRP-dependent regulatory mechanism may be critical in controlling the metabolic direction of pyruvate in the cell, either towards the oxidative catabolism of pyruvate via the pyru ...
2. The Ozone 35 2. The ozone
... characterized by end oxygen atoms with only six electrons. This fact defines the electrophilic nature that ozone shows in most of its chemical reactions. Ozone is soluble in many substances, forming either stable or metastable solutions. Under practicable conditions in water, ozone is about 14 times ...
... characterized by end oxygen atoms with only six electrons. This fact defines the electrophilic nature that ozone shows in most of its chemical reactions. Ozone is soluble in many substances, forming either stable or metastable solutions. Under practicable conditions in water, ozone is about 14 times ...
Photochemical and Photophysical Properties of Tetranuclear and
... into account indicate that the emissive state is of mixed d-s/XLCT character delocalized over the CuJ4 core with roughly equal contributions from each component.lg For simplicity we have referred to this excited state as “cluster centered” (CC). The emission lifetimes (Table I) are consistent with a ...
... into account indicate that the emissive state is of mixed d-s/XLCT character delocalized over the CuJ4 core with roughly equal contributions from each component.lg For simplicity we have referred to this excited state as “cluster centered” (CC). The emission lifetimes (Table I) are consistent with a ...
Chemical Processes at the Water-Manganite (γ-MnOOH
... The chemistry of mineral surfaces is of great importance in many different areas including natural processes occurring in rivers, lakes and soils. Metal ions and other compounds can adsorb onto mineral surfaces and, thus, the fate of these substances can be greatly influenced by the surface chemistr ...
... The chemistry of mineral surfaces is of great importance in many different areas including natural processes occurring in rivers, lakes and soils. Metal ions and other compounds can adsorb onto mineral surfaces and, thus, the fate of these substances can be greatly influenced by the surface chemistr ...
Research Associate, Dept
... belongs together with other human and animal pathogens like haematozoans Plasmodium sp., Babesia sp. and coccidians Toxoplasma gondii, Isospora sp., Cyclospora sp. and Eimeria sp. to the phylum Apicomplexa. Apicomplexans, together with ciliates and dinoflagellates, form a phylogenetically related, b ...
... belongs together with other human and animal pathogens like haematozoans Plasmodium sp., Babesia sp. and coccidians Toxoplasma gondii, Isospora sp., Cyclospora sp. and Eimeria sp. to the phylum Apicomplexa. Apicomplexans, together with ciliates and dinoflagellates, form a phylogenetically related, b ...
HAT(CN)6: a new building block for molecule
... were nevertheless carried out. When a mixture of water/ acetonitrile was used for the reaction medium, the novel complex M(HAT(CN)4O2)(H2O)4 (M: Co, Ni) was isolated (Fig. 4). This result demonstrates the fact that HAT(CN)6 is hydrolytically unstable and undergoes cleavage of the two activated nitri ...
... were nevertheless carried out. When a mixture of water/ acetonitrile was used for the reaction medium, the novel complex M(HAT(CN)4O2)(H2O)4 (M: Co, Ni) was isolated (Fig. 4). This result demonstrates the fact that HAT(CN)6 is hydrolytically unstable and undergoes cleavage of the two activated nitri ...
Glutathione as an endogenous sulphur source in the
... Buthionine-(S,R)-sulphoximine(BSO), a specific transition-state inhibitor of y-glutamylcysteine synthetase (Griffith & Meister, 1979),lowered the GSH level in cells of S. cerevisiae (Fig. 2). Depletion with BSO enabled us to check the effect of GSH on y-GT biosynthesis in the wild-type strain 1278b. ...
... Buthionine-(S,R)-sulphoximine(BSO), a specific transition-state inhibitor of y-glutamylcysteine synthetase (Griffith & Meister, 1979),lowered the GSH level in cells of S. cerevisiae (Fig. 2). Depletion with BSO enabled us to check the effect of GSH on y-GT biosynthesis in the wild-type strain 1278b. ...
The experiments provide ne~~~den~~~~t the r&rate clewage pathway... of carbon for the synthesis of $tty ack& k‘l...
... authors demonstrated that race&c bydroxy~trat~ is. attacked by what was presumed to be isocitrate .d~hydrogena~ from various sources. On the other hand, racemic ~~Z~bydr~~yc~trateis riot attacked. Racemic hydroxycitrate was resqlved, a it was shown that only the (-Y )-isomer is attacked. These resuh ...
... authors demonstrated that race&c bydroxy~trat~ is. attacked by what was presumed to be isocitrate .d~hydrogena~ from various sources. On the other hand, racemic ~~Z~bydr~~yc~trateis riot attacked. Racemic hydroxycitrate was resqlved, a it was shown that only the (-Y )-isomer is attacked. These resuh ...
Chapter 16 The Citric Acid Cycle
... 39. Reactions of the citric acid cycle Page: 606 Difficulty: 3 There are few, if any, humans with defects in the enzymes of the citric acid cycle. Explain this observation in terms of the role of the citric acid cycle. Ans: The citric acid cycle is central to all aerobic energy-yielding metabolisms ...
... 39. Reactions of the citric acid cycle Page: 606 Difficulty: 3 There are few, if any, humans with defects in the enzymes of the citric acid cycle. Explain this observation in terms of the role of the citric acid cycle. Ans: The citric acid cycle is central to all aerobic energy-yielding metabolisms ...
Berleman, J. Analysis of inter-species interactions and
... SWC is an unbuffered media and excretion of organic acids are likely to reduce the net pH of the system, which could impact energy intensive processes such as bioluminescence, growth and even survivability. To determine if dim bioluminescence is a consequence of the build up of organic acids excrete ...
... SWC is an unbuffered media and excretion of organic acids are likely to reduce the net pH of the system, which could impact energy intensive processes such as bioluminescence, growth and even survivability. To determine if dim bioluminescence is a consequence of the build up of organic acids excrete ...
Carnitine Acetyltransferase and Mitochondrial Acetyl
... modulated by the CrAT enzyme. Because PDH and glucose oxidation are negatively regulated by high fat feeding and obesity, we reasoned that nutritional conditions that promote lipid availability and fat oxidation might likewise compromise CrAT activity. We report an accumulation of long chain acylcar ...
... modulated by the CrAT enzyme. Because PDH and glucose oxidation are negatively regulated by high fat feeding and obesity, we reasoned that nutritional conditions that promote lipid availability and fat oxidation might likewise compromise CrAT activity. We report an accumulation of long chain acylcar ...
The Effect of Arsenic on Liver Tissue of Experimental Animals
... arsenic on liver tissue of Mice, Rats and Fish at different times as indicated in various research works. Non-degradable heavy metals are regarded as hazardous to aquatic ecosystems because of their environmental persistence and their tendency for bioaccumulation. Different species of elements can e ...
... arsenic on liver tissue of Mice, Rats and Fish at different times as indicated in various research works. Non-degradable heavy metals are regarded as hazardous to aquatic ecosystems because of their environmental persistence and their tendency for bioaccumulation. Different species of elements can e ...
Document
... •Autophosphorylation of kinase •Phosphate transfer to a response regulator •Release of an activated ligand or activation of soluble factor •Derepression of genes involved in ...
... •Autophosphorylation of kinase •Phosphate transfer to a response regulator •Release of an activated ligand or activation of soluble factor •Derepression of genes involved in ...
Modulation of Fibroblast Growth Factor
... polysulfonates PSS and PAS inhibited FGF-2-induced activation of mitogen-activated protein kinase-1/2, involved in FGF-2 signal transduction. In conclusion, sulfonic acid polymers bind FGF-2 by mimicking heparin interaction. These compounds may provide a tool to inhibit FGF-2-induced endothelial cel ...
... polysulfonates PSS and PAS inhibited FGF-2-induced activation of mitogen-activated protein kinase-1/2, involved in FGF-2 signal transduction. In conclusion, sulfonic acid polymers bind FGF-2 by mimicking heparin interaction. These compounds may provide a tool to inhibit FGF-2-induced endothelial cel ...
IE in C-H activation - The School of Life Sciences at Sussex
... metal-carbon bonds. In this Account, the subject of isotope effects in some of these reactions will be examined in detail, as these effects are oftentimes quoted as having relevance to the mechanism(s) of C-H bond activation. A general sequence for activation of a hydrocarbon C-H bond is shown in eq ...
... metal-carbon bonds. In this Account, the subject of isotope effects in some of these reactions will be examined in detail, as these effects are oftentimes quoted as having relevance to the mechanism(s) of C-H bond activation. A general sequence for activation of a hydrocarbon C-H bond is shown in eq ...
Evolution of metal ions in biological systems
Evolution of Metal Ions in Biological Systems refers to the incorporation of metallic ions into living organisms and how it has changed over time. Metal ions have been associated with biological systems for billions of years, but only in the last century have scientists began to truly appreciate the scale of their influence. Major (iron, manganese, magnesium and zinc) and minor (copper, cobalt, nickel, molybdenum, tungsten) metal ions have symbiotically aligned with living organisms and the associated complexes have evolved over time.