2,268 research outputs found
Transferring Davey`s Theorem on Annihilators in Bounded Distributive Lattices to Modular Congruence Lattices and Rings
Congruence lattices of semiprime algebras from semi--degenerate
congruence--modular varieties fulfill the equivalences from B. A. Davey`s
well--known characterization theorem for --Stone bounded distributive
lattices, moreover, changing the cardinalities in those equivalent conditions
does not change their validity. I prove this by transferring Davey`s Theorem
from bounded distributive lattices to such congruence lattices through a
certain lattice morphism and using the fact that the codomain of that morphism
is a frame. Furthermore, these equivalent conditions are preserved by finite
direct products of such algebras, and similar equivalences are fulfilled by the
elements of semiprime commutative unitary rings and, dualized, by the elements
of complete residuated lattices.Comment: 18 page
Entangling two distant oscillators with a quantum reservoir
The generation of entanglement between two oscillators that interact via a
common reservoir is theoretically studied. The reservoir is modeled by a
one-dimensional harmonic crystal initially in thermal equilibrium. Starting
from a separable state, the oscillators can become entangled after a transient
time, that is of the order of the thermalization time scale. This behavior is
observed at finite temperature even when the oscillators are at a distance
significantly larger than the crystal's interparticle spacing. The underlying
physical mechanisms can be explained by the dynamical properties of the
collective variables of the two oscillators which may decouple from or be
squeezed by the reservoir. Our predictions can be tested with an ion chain in a
linear Paul trap.Comment: 5 pages, 4 figure
Entangling two distant oscillators with a quantum reservoir
The generation of entanglement between two oscillators that interact via a
common reservoir is theoretically studied. The reservoir is modeled by a
one-dimensional harmonic crystal initially in thermal equilibrium. Starting
from a separable state, the oscillators can become entangled after a transient
time, that is of the order of the thermalization time scale. This behavior is
observed at finite temperature even when the oscillators are at a distance
significantly larger than the crystal's interparticle spacing. The underlying
physical mechanisms can be explained by the dynamical properties of the
collective variables of the two oscillators which may decouple from or be
squeezed by the reservoir. Our predictions can be tested with an ion chain in a
linear Paul trap.Comment: 5 pages, 4 figure
Covariates of first marriage dissolution: derived from Austrian FFS
Der Familien- und Fertilitätssurvey FFS 96 ist eine internationale empirische Datenerhebung zum Themenbereich Partnerschaft, Familienbildung und reproduktives Verhalten. Der FFS ist ein von der ECE (Europäischen Wirtschaftskommission) in Genf organisiertes Großprojekt, an dem sich derzeit, Östereich miteingeschlossen, 20 europäische Länder, die USA und Kanada beteiligen.The increase in divorce rates in most industrialized countries over the past decades and the growing concern about negative consequences of divorce of parents on the children affected, led to a marked upswing in the interest in the sociodemographic determinants of divorce. The present paper will only be a first step in studying these issues using data from the Austrian FFS. It presents an exploratory bi-variate and multi-variate analysis of a number of covariates of divorce risks for which marital duration is still used as the indexing variable. As next steps we plan to define APC-type models with covariates that help to better assess the roles of duration, age, and age at marriage and finally extend the analysis to cross-national comparisons on the basis of other FFS data sets
Feasibility and Participants' Satisfaction
The Internet-based psychotherapeutic intervention Onco-STEP for adolescent and
young adult (AYA)-aged survivors of pediatric cancer was developed,
implemented, and participants' satisfaction was evaluated by use of
questionnaires. The intervention consisted of two modules: “Looking Back,”
aimed to reduce posttraumatic stress symptoms, and “Looking Ahead,” supported
coping with cancer-related fears of relapse and progression. The writing
program was fully completed by 20 participants (Mage=27.3±4.8 years at study;
70% female). The majority was satisfied and perceived the treatment components
as helpful. Results demonstrate that an Internet-based psychotherapeutic
intervention for AYA-aged survivors of pediatric cancer is feasible and
accepted by the target population
Leishmania siamensis als Erreger von autochthoner kutaner Leishmaniose bei Pferden in Deutschland - eine neue Infektionskrankheit in Mitteleuropa?
Aus mitteleuropäischer Sicht ist die durch Parasiten verursachte und von Sandmücken übertragene Leishmaniose eine in Ländern tropischer und subtropischer Regionen
auftretende Infektionskrankheit. In zunehmendem Maße werden jedoch autochthone Fälle in Mitteleuropa, insbesondere in Süddeutschland, verzeichnet. Dies ist vermutlich auf die globale Erwärmung und die Ausdehnung des Verbreitungsgebietes der Sandmücken nach Norden zurückzuführen. Die vorliegende Arbeit befasst sich mit der Identifizierung und phylogenetischen Charakterisierung der Erreger dieser Fälle. Dazu wurden verschiedene Marker im Leishmaniengenom sequenziert und mit bekannten Arten verglichen. Die untersuchte DNA stammte von autochthonen kutanen Leishmaniosen bei Pferden und einem Rind, die in den letzten zehn Jahren in Deutschland und der Schweiz auftraten. Aufgrund identischer Sequenzen konnten die Parasiten als L. siamensis identifiziert bzw. verifiziert werden, eine erst im Jahr 2008 neu beschriebene Art, die in Thailand humane viszerale Leishmaniose verursacht. Die phylogenetischen Analysen zeigten die Ähnlichkeit von L. siamensis mit weiteren bisher nicht identifizierten Stämmen aus Martinique und Ghana, die kutane Leishmaniose bei Menschen verursachen. Um die Frage zu beantworten, ob sich die Leishmaniose zu einer in Mitteleuropa endemischen zoonotischen Krankheit entwickeln könnte, müssen weitere Studien über kompatible Vektoren, mögliche Reservoire und zur Virulenz durchgeführt werden
Physician empathy: Definition, outcome-relevance and its measurement in patient care and medical education
Objective: The present study gives a brief introduction int
The cytotoxin of Pseudomonas aeruginosa:Cytotoxicity requires proteolytic activation
The primary structure of a cytotoxin from Pseudomonas aeruginosa was determined by sequencing of the structural gene. The cytotoxin (31,700 Mr) lacks an N-terminal signal sequence for bacterial secretion but contains a pentapeptide consensus sequence commonly found in prokaryotic proteins which function in a TonB-dependent manner. The cytotoxin gene has a [G + C]-content of 53.8% which is considerably lower than generally observed for genes from Pseudomonas aeruginosa. The cytotoxin gene was exclusively detected in strain 158 but not in three other clinical isolates, as determined by Southern and Northern hybridization. The latter technique revealed that the toxin is translated from monocistronic mRNA. The promoter of the cytotoxin is inactive in Escherichia coli. Upon site-directed modification of the 5'-noncoding region by the polymerase chain reaction the gene was expressed under control of the trc-promoter. The gene product obtained in Escherichia coli was nontoxic. Toxicity was induced by subsequent treatment with trypsin. [35S]methionine-labeled cytotoxin with high specific radioactivity was obtained by in vitro transcription/translation. Like [125I] labeled material from Pseudomonas aeruginosa this polypeptide bound to membrane preparations from Ehrlich ascites cells, as evidenced by sedimentation through a sucrose gradient at neutral pH
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