Search Results - (Author, Cooperation:M. Sebastian)

2018-02-27

The American Society for Microbiology (ASM)

0022-538X

1098-5514

Medicine

2018-02-13

Wiley-Blackwell

0007-0963

1365-2133

Medicine

2015-05-23

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Animals ; *Food Chain ; Host Specificity ; Oceans and Seas ; Phylogeny ; Plankton/*classification/*physiology ; Platyhelminths/classification/physiology ; Sunlight ; *Symbiosis ; Viruses/classification

2013-01-04

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

2025-05-13

Mit der Entwicklung hin zur Wissensgesellschaft gewinnt nicht bloß wissenschaftliches Wissen an Bedeutung, etwa für die Legitimierung politischer Entscheidungen, sondern wird auch zunehmend zum Gegenstand politischer und gesellschaftlicher Konflikte. Vor dem Hintergrund wissenspolitischer Konflikte diskutiert der Beitrag die wissenssoziologischen Implikationen der aktuellen Debatten über einen "antiliberalen Backlash" und eine "große Regression", die zunehmende Thematisierung der Politisierung des Wissens als ein multidimensionales Phänomen sowie die politiktheoretischen Implikationen der Wissensproblematik der Politik.

Soziologie, Anthropologie ; Politikwissenschaft ; Sociology & anthropology ; Political science ; Wissenssoziologie ; politische Willensbildung, politische Soziologie, politische Kultur ; Sociology of Knowledge ; Political Process, Elections, Political Sociology, Political Culture ; Wissensgesellschaft ; Demokratie ; Polarisierung ; Politikberatung ; Wissen ; Politisierung ; Öffentlichkeit ; knowledge society ; democracy ; polarization ; political consulting ; knowledge ; politicization ; the public

Konferenzbeitrag, Sammelwerksbeitrag, conference paper, collection article

2025-05-13

This article provides an overview on the historical development and the current state of the implementation of labour mobility in Europe. In light of the present challenges of labour mobility within the context of the European Union (EU), we propose to shift the focus away from a predominant emphasis on the history of European integration and current events in the European Union towards a broader socio-historical perspective. This socio-historical perspective shows that the legal concept of the “freedom of movement” is by no means confined to the EU and its predecessors. An examination of the struggles and obstacles encountered in the implementation of the principle of free movement can be useful for an exploration of both the fundamental dilemmas and obstacles as well as basic features and practices of European integration and transnational institution-building.

Geschichte ; Politikwissenschaft ; History ; Political science ; labour mobility; history; European studies; socio-historical approach ; Sozialgeschichte, historische Sozialforschung ; Europapolitik ; Social History, Historical Social Research ; European Politics ; Europa ; Arbeitskräfte ; Mobilität ; europäische Integration ; Europäisierung ; EU ; Freizügigkeit ; Migration ; Europe ; manpower ; mobility ; European integration ; Europeanization ; freedom of movement ; migration ; 30300 ; 10500 ; 10200

Zeitschriftenartikel, journal article

1089-7550

AIP Digital Archive

Physics

All the nine elastic constants of the orthorhombic crystal lithium hydrazinium sulfate, Li(N2H5)SO4, have been determined by measuring ultrasonic velocities using pulse echo overlap technique at 10 MHz. Temperature variation of all the six diagonal elastic constants and the three off-diagonal combinations have been measured between 300 and 450 K. Some of the constants show anomalous behavior in the 410–440 K temperature region, which is attributed to a phase transition in the crystal near 425 K. Magnitude of the velocity anomaly is comparatively small. A new high-temperature ultrasonic bond material suitable for transverse waves is also reported.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

The lattice sites of ion implanted Li atoms in GaN were studied as a function of implantation temperature between room temperature and 770 K. We measured the channeling and blocking patterns of α-particles emitted in the radioactive decay of implanted 8Li ions to determine the Li lattice sites. Below 700 K Li atoms occupy mainly interstitial sites in the center of the c-axis hexagons at positions c/4 and 3c/4, where c is the lattice constant in c-axis direction. Around 700 K Li starts to diffuse and presumably interacts with vacancies created in the implantation process. This leads to the formation of substitutional Li above 700 K. An activation energy of about 1.7 eV for interstitial Li diffusion was determined. © 1998 American Institute of Physics.

Electronic Resource

1399-3038

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

To evaluate the role of Chlamydia pneumoniae respiratory tract infection on pediatric asthma, allergic rhinitis or atopic eczema initiation, children of three age groups (n = 1211) were prospectively studied for a C. pneumoniae infection using throat swabs and polymerase chain reaction (PCR) with enzyme immunoassay (EIA) detection. Infected children (study group, SG) were examined monthly until the agent could not be detected, quantifying persistent infection. They were compared with randomly selected, non-infected children without asthma matched for age, gender and origin (control group, CG) regarding lung function and inflammatory parameters as well as initiation of allergic diseases judged by family doctor diagnosis after, in median, 22 months. At the first follow-up examination, SG children revealed a higher leukotriene B4 (median 36 pg/ml vs. 19, p = 0.04) and 8-isoprostane (median 15 pg/ml vs. 12, p = 0.04) in breath condensate characterizing neutrophil, agent-related inflammation and oxidative stress in the lower airways. Cysteinyl leukotrienes, important in acute allergic inflammation, were without difference. Local, anti C. pneumoniae secretory immunoglobulin A antibodies were higher in children after C. pneumoniae infection (optical density median 0.7 vs. 0.4, p = 0.001) confirming PCR–EIA results. At the final examination, there was no difference in pathological lung function tests, parameters of exhaled breath condensate or eosinophilia of the nasal mucosa. Incidence of asthma (0/55 vs. 5/54, p = 0.03) and allergic rhinitis [3/53 vs. 10/52, p = 0.04, odds ratio and 95% confidence interval-OR 0.25 (0.06;0.98)] as well as prevalence of asthma [1/56 vs. 9/58, p = 0.02, OR 0.1 (0.01;0.81)] and allergic rhinitis [6/56 vs. 16/58, p = 0.03, OR 0.32 (0.11;0.88)] were lower in the SG children. There was no association in atopic eczema. Three children with persistent infection revealed a slightly higher incidence in allergic rhinitis without significance than those with single C. pneumoniae detection (1/3 vs. 2/50), however, not to the CG. In conclusion a C. pneumoniae upper respiratory tract infection may be regarded as a protective factor for childhood asthma or allergic rhinitis in a population of kindergarten and school-age children.

Electronic Resource

1399-3038

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

A relationship between respiratory Chlamydia pneumoniae infection (RCPI) and bronchial asthma is under discussion. Our objective was to study the frequency of RCPI and whether it is associated with markers of asthma in children with recurrent or chronic bronchitis as well as pneumonia. One-hundred and forty-eight children who underwent bronchoscopy were enrolled; 42 children with additional respiratory infections were excluded. Therefore, 106 children were examined, regarding a RCPI, by polymerase chain reaction (PCR) of tracheobronchial aspirate, eosinophilic inflammation of respiratory mucosa (cytology, eosinophilic cationic protein [ECP]), total serum immunoglobulin E (IgE) and specific IgE for six important allergens, as well as lung function tests if possible. There was a RCPI in 55 of 106 children (51.9%); 25.4% of PCR positives (14/55) were weakly positive (double cut-off), which was more prevalent in the 2–5-year age-group and teenagers. Children with RCPI, inclusive of weak positives, showed a milder eosinophilia of nasal mucosa than children without RCPI (5.58% vs. 9.35%, p=0.039). Eosinophilia of ≥13% in nasal- and/or bronchial swab, as a marker for respiratory allergy, was less frequent in patients with RCPI too (7.3% vs. 21.6%, p=0.035). There were no differences in ECP. Total IgE was lower in PCR-positive children (101 vs. 179 IU/ml, p=0.032). Specific IgE with a radioallergosorbent test (RAST) of at least class 3 (as a marker for a relevant allergy), as well as any RAST above zero (to characterize early forms of allergy), were both less frequent in the RCPI group. In contrast, weak positives showed the highest rates of sensitization, surpassing RCPI negatives. In lung-function tests, vital capacity was lower in RCPI patients (87.5% vs. 95.3%, p=0.045); all parameters characterizing obstructive disturbance tended to be higher. Weak positives had both the greatest reduction of vital capacity (75.3%) and the most impaired obstructive parameters. All differences were accentuated in children of 11–18 years of age. Hence, our results indicate that in the children selected, a RCPI is common and not associated with allergic respiratory inflammation. Weak positives, however, differ, having the highest rate of allergic sensitization, reduction of lung volume, and obstructive disturbance. This group might be important in clinically observed asthma after pneumonia caused by C. pneumoniae. In these children, early diagnosis and treatment of a RCPI is recommended.

Electronic Resource

0024-4589

Linguistics and Literary Studies

1546-1696

Nature Archives 1869 - 2009

Biology

Process Engineering, Biotechnology, Nutrition Technology

[Auszug] Genetic engineering of higher plant plastids typically involves stable introduction of antibiotic resistance genes as selection markers. Even though chloroplast genes are maternally inherited in most crops, the possibility of marker transfer to wild relatives or microorganisms cannot be completely ...

Electronic Resource

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] Protein modification by the conjugation of ubiquitin moieties—ubiquitination—plays a major part in many biological processes, including cell cycle and apoptosis. The enzymes that mediate ubiquitin-conjugation have been well-studied, but much less is known about the ...

Electronic Resource

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] Rap1 is a small, Ras-like GTPase that was first identified as a protein that could suppress the oncogenic transformation of cells by Ras. Rap1 is activated by several extracellular stimuli and may be involved in cellular processes such as cell proliferation, cell differentiation, T-cell anergy ...

Electronic Resource

0014-2921

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Economics

Electronic Resource

0264-9993

Demand rationing ; Employment ; Spanish economy

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Economics

Electronic Resource

1434-6036

Springer Online Journal Archives 1860-2000

Physics

Abstract. The microwave dielectric properties of ZnAl2O4 spinels were investigated and their properties were tailored by adding different mole fractions of TiO2. The samples were synthesized using the mixed oxide route. The phase purity and crystal structure were identified using X-ray diffraction technique. The sintered specimens were characterized in the microwave frequency range (3-13 GHz). The ZnAl2O4 ceramics exhibited interesting dielectric properties (dielectric constant ( $\varepsilon_{r}) = 8.5$ , unloaded quality factor (Q u ) = 4590 at 12.27 GHz and temperature coefficient of resonant frequency ( $\tau_{f}) = -79$ ppm/ $^{\circ}$ C). Addition of TiO2 into the spinel improved its properties and the $\tau_{f}$ approached zero for 0.83ZnAl2O4-0.17TiO2. This temperature compensated composition has excellent microwave dielectric properties ( $\varepsilon _{r} = 12.67$ , Q u = 9950 at 10.075 GHz) which can be exploited for microwave substrate applications.

Electronic Resource

0211-3589

Ethnic Sciences

History

RESEÑAS

1420-9071

Drosophila-related species ; obscura group ; heat shock ; hsps

Springer Online Journal Archives 1860-2000

Biology

Medicine

Abstract The effect of heat shock on protein synthesis in three relatedDrosophila species belonging to theobscura group was analyzed on SDS-acrylamide gels. Four major heat shock proteins (hsps) were found in these species, in which synthesis reaches a maximum at 34°C. Although the higher molecular weight proteins are conserved, differences in size were found for the small hsps in these species. By means of in situ hybridization usingD. melanogaster probes for the small hsp genes, it was inferred that the small hsp genes of theobscura group species are clustered at the 27A locus in all three species.

Electronic Resource

1432-1998

Springer Online Journal Archives 1860-2000

Medicine

Abstract We present an unusual case of popliteal entrapment syndrome type I in an 11-year-old boy. Presenting symptoms were exercise-related pain and pallor in his left lower leg. The diagnosis of popliteal entrapment syndrome was established by acral plethysmography, colour-coded Doppler sonography and MRI. After myotomy of the gastrocnemius muscle the symptoms resolved completely. Post-operative duplex scan showed normal blood flow, even in plantar flexion of the foot.

Electronic Resource