(Received) We study the Weyl closure Cl(L) = K(x)h@iL \ D for an operator L of the rst Weyl algebra D = Khx;@i. We give an algorithm to compute Cl(L) and we describe its initial ideal under the order ltration. Our main application is an algorithm for constructing a Jordan-HH older series for a holonomic D-module and a formula for its length. Using the closure, we also reproduce a result of Strr...

The position of diierent kinds of CP stars of the upper Main Sequence (i.e. Am stars and the four categories of Ap stars: He-weak, HgMn, Si and SrCrEu) in the HR diagram is examined. Using only those stars having a parallax with a relative error smaller than 0.14 ((M v) 0:3) and an absolutely certain peculiarity, it is shown that their absolute magnitudes are similar to those obtained from CP s...

Liverwort Blasia pusilla L. recruits soil nitrogen-fixing cyanobacteria of genus Nostoc as symbiotic partners. In this work we compared Nostoc community composition inside the plants and in the soil around them from two distant locations in Northern Norway. STRR fingerprinting and 16S rDNA phylogeny reconstruction showed a remarkable local diversity among isolates assigned to several Nostoc cla...

After freezing and thawing, Pseudomonas aeruginosa harboring a drug resistance plasmid (Hg2+r, Strr), became acutely sensitive to mercuric ions but not to streptomycin in the plating medium, whereas its sensitivity to both agents became more pronounced indicating a synergistic effect. This freeze-thaw-induced sensitivity was transient and capable of being repaired to a simple salts medium. Tran...

We review the eeective temperature scale of hot (10kK) stars, including results from direct, continuum and ionization equilibrium techniques. We discuss the impact of recent developments in theoretical model atmospheres for OB subdwarfs, dwarfs and supergiants, white dwarfs and Wolf Rayet stars and present a revised T ee scale for OB stars. Direct techniques coupled with Kurucz model atmosphere...

We previously reported that a 4.2 kb SacI-EcoRI DNA region from Streptomyces kasugaensis M338-M1, a kasugamycin (KSM) producer, included KSM transporter genes (kasKLM). As an extension of that study, a 3.7 kb Psti-SacI DNA region, located at 1.5 approximately 5.2 kb upstream of kasK, was cloned and sequenced, revealing three complete open reading frames, designated kasT, kasU and kasJ. The kasJ...

For a sample of 2440 non-supergiant Hipparcos stars belonging to Strr omgren's `early group' luminosities, temperatures, ages and distances have been determined. 241 stars younger than 30 Myr with well determined ages and space velocities fall within the local attened system, inclined 20 o to the galactic plane, called Gould's Belt. The system is dominated by a number of nearby prominent associ...