39 research outputs found
Properties and applications of precision oligomer materials; where organic and polymer chemistry join forces
Precise oligomeric materials constitute a growing area of research with implications for various applications as well as fundamental studies. Notably, this field of science which can be termed macroâorganic chemistry, draws inspiration from both traditional polymer chemistry and organic synthesis, combining the molecular precision of organic chemistry with the materials properties of macromolecules. Discrete oligomers enable access to unprecedented materials properties, for example, in selfâassembled structures, crystallization, or optical properties. The degree of control over oligomer structures resembles many biological systems and enables the design of materials with tailored properties and the development of fundamental structureâproperty relationships. This Review highlights recent developments in macroâorganic chemistry from synthetic concepts to materials properties, with a focus on selfâassembly and molecular recognition. Finally, an outlook for future research directions is provided
Phase Behavior of Amphiphilic Diblock Co-oligomers with Nonionic and Ionic Hydrophilic Groups
An introduction to MATLAB programming and numerical methods for engineers / Timmy Siauw, Alexandre M. Bayen.
Includes bibliographical references and index.xix, 317 pages
Catalytic cracking of Canadian nonconventional feedstocks. 1. Cracking characteristics of gas oils derived from coprocessing distillate and shale oil
Hydrotreating of a Bitumen-Derived Coker HGO and Evaluation of Hydrotreated HGOs as Potential FCC Feeds Using Microactivity Test Unit
Tödliche Hirnmassenblutung infolge Vitamin-K-Mangels bei einem 9 Wochen alten SÀugling
Intrakranielle Blutungen sind im SĂ€uglingsalter seltene, aber lebensbedrohende Ereignisse. Neben GefĂ€Ămissbildungen, Stoffwechseldefekten sowie Störungen der Blutgerinnung kommen v.âŻa. nichtakzidentielle Traumata, SchĂŒtteltrauma in Betracht. Die klinische Diagnostik umfasst hinsichtlich der Blutungsgenese neben Sonographie und MRT als apparatives Verfahren auch eine Fundoskopie sowie laborchemische Analysen, insbesondere der Gerinnungsparameter. FĂŒr die Blutgerinnung ist das fettlösliche Vitamin K essenziell: FrĂŒhe, klassische und spĂ€te Vitamin-K-Mangel-Blutungen werden dabei unterschieden. Um ein gehĂ€uftes Wiederauftreten von Vitamin-K-Mangel-Blutungen bei Neugeborenen und jungen SĂ€uglingen zu verhindern, bedarf es einer hinreichenden AufklĂ€rung der Eltern. Eine Verweigerung der Prophylaxe scheint Folge einer weltanschaulich begrĂŒndeten Ablehnung der Schulmedizin und ein zunehmendes PhĂ€nomen in wohlhabenden IndustrielĂ€ndern zu sein.Intracranial hemorrhages in infants are rare but life-threatening events. Apart from vascular malformations, metabolic disorders and coagulopathies, nonaccidental trauma, in particular shaken baby syndrome must be taken into consideration. Clinical diagnostic tests and procedures to further evaluate the etiology of the hemorrhage include sonography and magnetic resonance imaging (MRI) as imaging procedures as well as fundoscopy and laboratory tests, especially with respect to coagulation parameters. Fat-soluble vitamin K is essential for blood coagulation. A differentiation is made between classical and delayed hemorrhages due to vitamin K deficiency. In order to avoid an increased recurrence of bleeding due to vitamin K deficiency in neonates and young infants, an adequate clarification for the parents is necessary. A refusal of prophylaxis seems to be the result of an ideologically founded rejection of classical medicine and an increasing phenomenon in affluent industrial countries