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Search Results: 1 - 10 of 1012 matches for " Kerstin Thies "
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Liquid Etherification of Alkoxybenzyl Alcohols, Cinnamyl Alcohols and Fluorinated Phenylalkenols with Platinum on Carbon (Pt/C) and Palladium on Carbon (Pd/C)  [PDF]
Thies Thiemann
International Journal of Organic Chemistry (IJOC) , 2018, DOI: 10.4236/ijoc.2018.81005
Abstract: In the presence of either Pd/C or Pt/C, 4-alkoxybenzyl alcohols, 4-alkoxy-phenylalkyl alcohols and cinnamyl alcohols undergo liquid etherification to bis(4-alkoxybenzyl) ethers, bis[(4-alkoxybenzyl)alkyl] ethers and bis(cin-namyl) ethers at temperatures of 100°C - 135°C. In a number of cases, Pt/C and Pd/C as catalysts, also when they are doped with Ru, show distinct differences when the reactions run in air, with an oxidative dehydrogenation of the alcohols as side-reaction, yielding the corresponding ketones and aldehydes as by-products. Also, the reactivity of fluorinated phenylalkenols under these conditions has been investigated. Furthermore, the immobilization of alkyl aryl ethers on silica within a column with passage of hexane as solvent was found to lead to the formation and elution of styrenes from the column in fair yield.
Spider Silk Constructs Enhance Axonal Regeneration and Remyelination in Long Nerve Defects in Sheep
Christine Radtke,Christina Allmeling,Karl-Heinz Waldmann,Kerstin Reimers,Kerstin Thies,Henning C. Schenk,Anja Hillmer,Merlin Guggenheim,Gudrun Brandes,Peter M. Vogt
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016990
Abstract: Surgical reapposition of peripheral nerve results in some axonal regeneration and functional recovery, but the clinical outcome in long distance nerve defects is disappointing and research continues to utilize further interventional approaches to optimize functional recovery. We describe the use of nerve constructs consisting of decellularized vein grafts filled with spider silk fibers as a guiding material to bridge a 6.0 cm tibial nerve defect in adult sheep.
Hydrogenation of Alkenes with NaBH4, CH3CO2H, Pd/C in the Presence of O- and N-Benzyl Functions  [PDF]
Nuha Al Soom, Thies Thiemann
International Journal of Organic Chemistry (IJOC) , 2016, DOI: 10.4236/ijoc.2016.61001
Abstract: NaBH4, CH3CO2H, Pd/C has been described as an effective reagent system to hydrogenate alkenes. Here, we show that the hydrogenation occurs chemoselectively, making it possible to hydrogenate alkenes under Pd/C catalysis with hydrogen created in situ without O- or N-debenzylation.
Active and Healthy Ageing at Work—A Qualitative Study with Employees 55 - 63 Years and Their Managers  [PDF]
Kerstin Nilsson
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.57002
Abstract: The proportion of elderly individuals in the population is increasing in most industrial countries. This demographic change increases the need of more people who work until an older age to maintain the welfare in the states. However, it is not clear if older employees are interested to in generally extend the working life to an older age. It is also not stated if managers in organizations are interested of extending their older employees working life. The overall aim of this study was to examine older employees own experience of their work situation and ageing at work. The aim was also to investigate their managers’ attitude to them as older employees. The investigation was conducted by focusing group interviews with employees aged 55 - 63 years, and with their mangers aged 40 - 63 years. The findings stated that the older employees’ consideration for an extend working life seemed to be based on their health and health problems in relation to their work situation; their personal economy; their managers attitude to them as elderly and the possibility to social inclusion at work; and their possibilities for self-crediting activities at work despite their age. The managers seem to have a positive attitude to some of the older employees’ experience knowledge, if that was in the same direction as their own interest. Otherwise the mangers saw the older employees as problem and obsoleted. The managers were also negative to older employees who got health problems which effect the work production negatively. The older workers in this study described managers’ importance to if they want to work in an extended working life. However, the managers seem not to understand their own importance in this and were not interested to keep all elderly in an extended working life.
The Influence of Work Environmental and Motivation Factors on Seniors’ Attitudes to an Extended Working Life or to Retire. A Cross Sectional Study with Employees 55 - 74 Years of Age  [PDF]
Kerstin Nilsson
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.57003
Abstract: Aim: The aim of this study was to investigate difference between whether individuals think they can work, and want to work until 65 years or not. Methods: A cross/sectional study including survey of 1949 employees aged 55 - 74 years. Results: Working environments were the most significant differences between the groups associated to if the respondents think they can work beyond 65 years or not. Motivation factors were the most significant differences between the groups associated with if the respondents want to work beyond 65 years or not. Conclusions: A satisfying work environment is important to whether people think they can work or not. Nevertheless, whether people want to work is depending on whether the employees are satisfied with the factors that promote their motivation for work. If society wants more people to work until an upper age, it is important to improve both work environmental factors and motivation factors in their work situation.
A novel Respiratory Health Score (RHS) supports a role of acute lung damage and pig breed in the course of an Actinobacillus pleuropneumoniae infection
Doris Hoeltig, Isabel Hennig-Pauka, Kerstin Thies, Thomas Rehm, Martin Beyerbach, Katrin Strutzberg-Minder, Gerald F Gerlach, Karl-Heinz Waldmann, FUGATO-consortium IRAS
BMC Veterinary Research , 2009, DOI: 10.1186/1746-6148-5-14
Abstract: A controlled experimental aerosol infection with an A. pleuropneumoniae serotype 7 isolate was performed using 106 weaning pigs of defined breeding lines from the breeds German Landrace, Piétrain, Hamphire, and Large White. Pigs were clinically assessed on days 4 and 20 post infection following a novel scoring system, the Respiratory Health Score (RHS), which combines clinical, sonographic and radiographic examination results. The ranking on day 4 was significantly correlated with the ranking based on the pathomorphological Lung Lesion Score (LLS; Spearman Rank Correlation Coefficient of 0.86 [p < 0.0001]). Based on their RHS pigs were assigned to the different quartiles independent of the breeding line. The RHS-based rankings of pigs on day 4 and on day 20 were highly correlated (Spearman Rank Correlation Coefficient of 0.82 [p < 0.0001]) independent of the breeding line. Pigs of the Hampshire line were predominantly found in the lowest scoring quartile (47.6%) and absent in the highest scoring quartile. In contrast, pigs of the German Landrace and Piétrain breeding lines were predominantly found in the highest scoring quartile (32.3% and 35.7%, respectively).These results demonstrate that the RHS obtained from live pigs shows a highly significant correlation to the lung lesion score considered as a "gold standard". The correlation of the ranking at days 4 and 20 post infection implies that the course of disease is highly dependent on the acute lung damage. The different severity of signs among the tested pig breeding lines clearly suggests a genetic difference in the susceptibility of pigs to A. pleuropneumoniae infection.Bacterial respiratory diseases caused by Mycoplasma hyopneumoniae, Actinobacillus pleuropneumoniae, and Haemophilus parasuis are of major importance in the pig industry [1-3]. They cause severe economic losses due to premature deaths and reduced daily weight gains [4]. Currently, productivity in infected herds is improved by antibiotic treatment
QCD in the axial gauge
M. Thies
Physics , 1995, DOI: 10.1016/0146-6410(96)00012-9
Abstract: We review a recent attempt to deal with non-perturbative features of QCD by analytical means, using a manifestly gauge invariant, canonical approach.
Duality between quark-quark and quark-antiquark pairing in 1+1 dimensional large N models
Michael Thies
Physics , 2003, DOI: 10.1103/PhysRevD.68.047703
Abstract: We identify a canonical transformation which maps the chiral Gross-Neveu model onto a recently proposed Cooper pair model. Baryon number and axial charge are interchanged. The same physics can be described either as chiral symmetry breaking (quark-antiquark pairing) or as superconductivity (quark-quark pairing).
Non-Abelian twisted kinks in chiral Gross-Neveu model with isospin
Michael Thies
Physics , 2015,
Abstract: The two-dimensional, massless Gross-Neveu model with Nc colors and SU(2) isospin is studied analytically in the large Nc limit. The chiral SU(2)L X SU(2)R symmetry is broken spontaneously in the vacuum. Twisted kinks connecting two arbitrary points on the vacuum manifold S3 are constructed, and their properties are explored. The phase diagram as a function of temperature, baryon- and isospin chemical potential is discussed, with special emphasis on inhomogeneous phases. The preferred form of the condensate is a product of the real kink crystal and the chiral spiral. Kink-kink scattering is solved, using the general solution of the multicomponent Bogoliubov-de Gennes equation recently presented by Takahashi.
From relativistic quantum fields to condensed matter and back again: Updating the Gross-Neveu phase diagram
Michael Thies
Physics , 2006, DOI: 10.1088/0305-4470/39/41/S04
Abstract: During the last few years, the phase diagram of the large N Gross-Neveu model in 1+1 dimensions at finite temperature and chemical potential has undergone a major revision. Here we present a streamlined account of this development, collecting the most important results. Quasi-one-dimensional condensed matter systems like conducting polymers provide real physical systems which can be approximately described by the Gross-Neveu model and have played some role in establishing its phase structure. The kink-antikink phase found at low temperatures is closely related to inhomogeneous superconductors in the Larkin-Ovchinnikov-Fulde-Ferrell phase. With the complete phase diagram at hand, the Gross-Neveu model can now serve as a firm testing ground for new algorithms and theoretical ideas.
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