Microorganisms colonizing straws buried in Chile desert soil samples

Microorganisms trapping by colonization of sterile organic plant parts buried in Chile desert soil sample

Ja aber – Korpusbasierte Beobachtungen zu einer pragmatisch beschreibbaren Konstruktion

In spoken conversation as well as in written texts we can find examples of a construction which has been the object of linguistic research for about 35 years and which has repeatedly been described under the names of ja-aber syntagma, ja-aber connection and ja-aber utterance pattern. In most analyses this construction is split into two parts: The ja-part is seen to convey (partial) consent, whereas the function of the aber-part is interpreted as (partial) objection. Falling back upon ja as affirmative response particle and aber as adversative conjunction, such analyses operate on semantically compositional principles. Additionally, the possibility of ja being a structuring particle is taken into consideration, where ja is supposed to ensure the mere connection of the part following the particle with the antecedent part. However, as this paper wants to show, compositional approaches like these tend to mislead studies to circular lines of arguments, in which presumptive findings are taken for presuppositions (petitio principii). Moreover, they seem to disregard actual usage of this construction, which can be ascertained with the help of corpora. Corpus-aided investigation of the construction in question shows that its semantic elaboration is dependent on two factors that go beyond compositional explanation attempts: (1) syntactical integration of the aber-part and (2) presence of negation in the aber-part. Not even in “classic” examples this construction can be semantically reduced to simple combinations of consent + objection, though. In order to reach appropriate results here, semantic analysis has to turn to pragmatically more adequate ways of description

Systems of Diagram Categories and K-theory. II

The additivity theorem for derivateurs associated to complicial biWaldhausen categories is proved. Also, to any exact category in the sense of Quillen a K-theory space is associated. This K-theory is shown to satisfy the additivity, approximation and resolution theorems.Comment: This is the final version (to appear in Mathematische Zeitschrift

On the K-theory of truncated polynomial algebras over the integers

We show that the K_{2i}(Z[x]/(x^m),(x)) is finite of order (mi)!(i!)^{m-2} and that K_{2i+1}(Z[x]/(x^m),(x)) is free abelian of rank m-1. This is accomplished by showing that the equivariant homotopy groups of the topological Hochschild spectrum THH(Z) are finite, in odd degrees, and free abelian, in even degrees, and by evaluating their orders and ranks, respectively.Comment: Journal of Topology (to appear

Algebraic Topology of Certain Sasaki Joins

The join construction produces a third Sasaki manifold from two others, and we investigate the algebraic topology of the joins of circle bundles over surfaces of positive genus with weighted three-spheres. Topologically, such a join has the structure of a lens space bundle over a surface. We calculate invariants determined by the fundamental group, the homology, and the cohomology. We find that, in general, there is torsion in the integral homology of the join. The torsion gives rise to two linking forms, and we identify these linking forms.Comment: 34 page