Traveling phase waves in asymmetric networks of noisy chaotic attractors.

We explore identical Rössler systems organized into two equally sized groups, among which differing positive and negative in- and out-coupling strengths are allowed. With this asymmetric coupling, we analyze patterns in the phase dynamics that coexist with chaotic amplitudes. We specifically investigate traveling phase waves where the oscillators settle on a new rhythm different from their own.

Collective dynamics in two populations of noisy oscillators with asymmetric interactions.

We study two intertwined globally coupled networks of noisy Kuramoto phase oscillators that have the same natural frequency but differ in their perception of the mean field and their contribution to it. Such a give-and-take mechanism is given by asymmetric in- and out-coupling strengths which can be both positive and negative. We uncover in this minimal network of networks intriguing patterns of discordance, where the ensemble splits into two clusters separated by a constant phase lag.

Approximate solution to the stochastic Kuramoto model.

We study Kuramoto phase oscillators with temporal fluctuations in the frequencies. The infinite-dimensional system can be reduced in a Gaussian approximation to two first-order differential equations. This yields a solution for the time-dependent order parameter, which characterizes the synchronization between the oscillators.

Onset of synchronization in complex networks of noisy oscillators.

We study networks of noisy phase oscillators whose nodes are characterized by random degrees counting the number of their connections. Both these degrees and the natural frequencies of the oscillators are distributed according to a given probability density. Replacing the randomly connected network by an all-to-all coupled network with weighted edges allows us to formulate the dynamics of a single oscillator coupled to the mean field and to derive the corresponding Fokker-Planck equation.

Late-onset fracture-associated osteosarcoma in a cat.

An 18-year-old male, castrated Domestic Shorthaired cat was presented with the complaint of acute severe lameness of the left pelvic limb. There was no history of trauma, apart from a distal physeal left femoral fracture that had been repaired 17 years previously. Radiology revealed a displaced distal metaphyseal femoral fracture with marked areas of bone lysis and periosteal proliferations.

The rewarding efficacy of brain stimulation and its modulation by dopaminergic drugs in young adult and old BN F344F1 rats.

In old age there is evidence of waning motivation, and possibly lowering of mood. Physiologically there is a decline in the levels of brain neurotransmitters such as acetylcholine and dopamine, and loss of myelin. These changes might be expected to impair the functioning of brain circuitry for reinforcement, and to lead to impaired motivation.

Growth of brain stimulation reward as a function of duration and stimulation strength.

The strength of a train of rewarding brain stimulation required to support a criterion level of operant performance declines hyperbolically as the duration is increased. This finding has been attributed to a process of leaky integration. However, the rate at which integration approaches asymptote has been shown to depend on stimulation strength, a finding that differs from the behavior of a simple leaky integrator.

[Intestinal microecology in human and veterinary medicine--a short excursion through the human and animal gut].

In honour to a great gut microbiologist the authors descend into the abdomen of humans and animals. By the way through the gut and excrements they illustrate the medical, culture-historical and literary importance of the gut and the gut flora.

[The effective antibacterial spectrum of sulfacetamide].

Swabs of the anterior eye segment of 180 eyes (145 patients) taken in the time period between August 1, 1989 until August 30, 1989 were sent to an external, independent microbiological institute in order to verify in-vitro antibacterial properties of marketed sulfacetamide containing drugs. MIC test was performed with isolated pathogenic bacterial strains without knowledge of the underlying diagnosis. It was shown that sulfacetamide is able to inhibit the growth of all isolated strains.

[Existence of an anabolically acting principle in an extract of E. coli].

Colibiogen, extracted from E. coli (in the following called coli extract) was examined for factors with anabolic efficiency, especially for anabolically efficient bases of nucleic acids and for peptides. The results obtained are the following: Tests for nucleotides, nucleosides and bases of nucleic acids by thin-layer chromatography technique turned out negative.

[Modifying the non-specific defense with bacteria, fungi and their metabolic products].

In a literature survey frequently mentioned bacterial and mycological modulators of the non-specific immune system are discussed. The substances are listed in a table pointing out indications respectively state of development. Commonly used definitions concerning substances that take influence in the non-specific immune system are discussed.

[Use of the reversed passive hemagglutination in detection of Clostridium botulinum type A, B, and E toxin (author's transl)].

With the reversed passive hemagglutination technique it is possible to detect minimal amounts of botulinum type A, B and E toxins (s. Tab. 3).