... structures. The metal cation in the center ofthe porphyrin ring is also coordinated to pyridyl groups of other tpp complexes, allowing the creation of an extended layer structure without the use of ... Figure 4, the first step in the formation of mesoporous Nb2O5, which takes place in the absence of water is the formation of a Nb-N covalent bond between the precursor Nb(OEt)5 and the long-chain ... condensation of these species in the presence of water leading to the formation of cylindrical micelles, and ultimately to a mesophase (route a’, b’ in Figure 4). Alternatively, the formation of the...
... temperature, the iodine value is largely a measure of the oleic-acid content and thereby ofthe softness ofthe fat. The iodine value of butterfat normally varies between 24 and 46. The variations ... those of κ-casein arereadily soluble. Due to the dominating localisation of κ-casein to the surface ofthe micelles, the solubility of calcium κ-caseinate prevails over the insolubility ofthe other ... formed. The protein is then precipi-tated from the solution. The pH at which this happens is called the isoelec-tric point ofthe protein.In the presence of an excess of hydrogen ions the molecules...
... in the membrane Similarity of structure to phospholipid membranes in living cells Avoid the hydrolytic degradation of drugs in water Reduce the RES uptake due to the rapid clearance of ... concentrations of 30-50 mol% almost non-polar increase hydrophobic interactions in the phospholipid bilayers drecrease the fluidity ofthe membrane OBJECTIVES On the completion of this ... the answers to the questions. Students will receive a publication on drug delivery system at least one week before the day ofthe exam. The exam questions will be based on the given article....
... out on the preparation of these compounds led to the discovery of many interesting substances and to the development of several new methods of synthe- sis. In addition, the results of the toxicological ... branching ofthe chain at the carbon atom adjacent to the oxygen appears to confer higher toxicity than branching at the end ofthe chain. (b) Replacement ofthe fluorine atom by another substituent, ... comparable to that of hydrogen cyanide. The toxicity of some of these fluophosphates is higher than that of phosgene. Their vapors have a pronounced effect on the eyes. Although there is no tear...
... some ofthe lattice sites•SiO2 becomes AlO2−• the negative charge is countered by the inclusion of a cationAlbite = ¼ of Si replaced by Al; Na(AlO2)(SiO2)3Anorthite = ½ of Si ... form of carbon that is a component of soot used as rubber strengthener7Silicates• the most abundant elements ofthe Earth’s crust are O and Si•silicates are covalent atomic solids of ... coal in the absence of air forms cokecarbon and ash•heating wood in the absence of air forms charcoalactivated carbon is charcoal used to adsorb other molecules•soot is composed of hydrocarbons...
... occurs in the case of 13G10±Fe(ToCPP) on the less hindered face of the porphyrin, close to the catalytic COOH residue, whereasin the case of 13G10±Fe(DoCPP) it can occur on the otherface ofthe porphyrin. ... (Table 1). The bind-ing ofthe ®rst CN±ligand to the iron was thus more easy in the hydrophobic binding pocket ofthe antibody than the binding ofthe second one, most probably because of the steric ... shown). This showsthat the binding ofthe two cyanide ligands to the ironatom of 13G10±Fe(ToCPP) actually occurred inside the binding pocket ofthe antibody. The value ofthe dissoci-ation constant...
... pro-nounced for the major elements, expressed as CaO and SO,. These two elements comprise on average 80 to 98% ofthe total sum ofthe analyzed elements in anhydrite; therefore the precision of their ... beam of white light is split into a rainbow of colors by a prism. The dispersion ofthe liquid is rarely the same as the solid. Therefore, although one wavelength of light may match up, others ... both setting characteristics of the stucco and, as a result, on the strength ofthe gypsum formed. The objective of the work described in this paper was to study the relationships between...
... evolu-tion with the inclusion of chapters on the structure of petroleum and the development of newtechnologies for refining the heavier feedstocks. The success ofthe first and second editions of this ... feature of residua and the heavier oils. Furthermore, the deeper the cut into the crude oil, the greater is the concentration of sulfur and metals in the residuum and the greater the deteriora-tion ... residence of the vapor in the heated zone.Treatment ofthe distillate (boiling up to 250°C, 480°F) ofthe tar with caustic soda causesseparation of a fraction known as tar acids; acid treatment of the...