Versuchsergebnisse im Ökologischen Ackerbau in Niedersachsen 2002 - 2003

Inhaltsübersicht: • Prüfung der Anfälligkeit aktuell verfügbarer Winterweizen der Qualitätsgruppen E, A und B gegenüber Flugbrand (Ustilago tritici) (Dr. Karl-Josef Müller) • Prüfung der Anfälligkeit aktuell verfügbarer Sommergersten gegenüber Hartbrand (Ustilago hordei) (Dr. Karl-Josef Müller) • Landessortenversuche im ökologischen Landbau zu den Kulturen Wintergerste, Körnererbsen, Ackerbohnen und Silomais (Markus Mücke, Armin Meyercordt) • Untersuchung zum Einfluss des Sklerotienbesatzes am Pflanzgut auf das Auftreten von Rhizoctonia solani im ökologischen Kartoffelanbau (Andreas Scholvin, Dr. Jürgen Grocholl) • Welchen Einfluss hat die Vorfrucht auf das Auftreten von Rhizoctonia solani im ökologischen Kartoffelanbau? (Andreas Scholvin, Dr. Jürgen Grocholl, Dr. Joachim Kakau) • Maisanbau auf suboptimalen Standorten (Carsten Rieckmann, Armin Meyercordt, Markus Mücke

Heavier group 13 metal(I) heterocycles stabilized by sterically demanding diiminophosphinates : a structurally characterized monomer-dimer pair for gallium

A. S. is grateful to the Australian Research Council for support and a fellowship. C. A. O. thanks the Australian Research Council for Discovery Project grants DP11015530 and DP130100483.We have synthesized and characterized the monomeric diiminophosphinate-stabilized group 13 metal(I) complexes [DipLE:], DipL = Ph2P(NDip)2, Dip = 2,6-iPr2C6H3; E = Ga ( 1 ), In ( 2 ) and Tl ( 3 ). In addition, we structurally characterized the dimeric complex [(DipLGa)2], 12 . Similar synthetic attempts using MesL = Ph2P(NMes)2, Mes = 2,4,6-Me3C6H2 afforded product mixtures from which the mixed oxidation state species [(MesL)3Ga4I3] 4 was isolated. [DipLGa:] 1 is converted with dry air to the gallium(III) oxide species [(DipLGaO)2] 5 . Density Functional Theory studies on [DipLE:] and [(DipLE)2], E = Al-Tl, shed light on the bonding in these compounds and show that the newly formed E-E bonding interactions can be described as weak single σ-bond with no significant π-bonding contribution for E = Al, Ga. A large contribution to the dimer binding enthalpies results from London dispersion forces.PostprintPeer reviewe

Teil 1: Einleitung und Zusammenfassung

Der vorliegende Bericht stellt die Einleitung zur Veröffentlichungsreihe "Landwirtschaft im Klimawandel: Wege zur Anpassung" der Landwirtschaftskammer Niedersachsen dar. Neben der Veranlassung zur Mitarbeit im Verbundprojekt werden die Untersuchungsgebiete vorgestellt und die Forschungsergebnisse zusammengefasst

Effiziente Wassernutzung im Ackerbau Nord-Ost-Niedersachsens

EFFIZIENTE WASSERNUTZUNG IM ACKERBAU NORD-OST-NIEDERSACHSENS Effiziente Wassernutzung im Ackerbau Nord-Ost-Niedersachsens / Grocholl, Jürgen [Bearb.] (Rights reserved) ( -

Multilab Validation Report for the Verification and Subtyping of Listeria monocytogenes Using qPCR

Listeria monocytogenes (Lm) is a Gram-positive bacterium that causes invasive listeriosis, an illness with high mortality and hospitalization rates. Due to the severity of illness associated with Lm, rapid identification and characterization of isolates from foods and the food-processing environment are critical to properly identify and track the pathogen and quickly remove adulterated foods from the market. Prior methods can rely on time-consuming biochemical or sera-agglutination assays to perform these tasks. Development of a high-throughput method that would rapidly perform these tasks is critical to improve response to contamination events. Previously, a single laboratory validation of a qPCR-based method was presented that could rapidly verify Lm isolates and characterize them into six molecular serogroups. In the current study, a multi-laboratory validation (MLV) was performed to evaluate the reliability of the qPCR method for identification and serogrouping of Lm isolates. Sixteen collaborating laboratories independently analyzed a panel of 43 blinded isolates plus three control strains using the qPCR method. This panel was comprised of representatives for non-Listeria (n = 7), Listeria sp. (n = 8), and Lm (n = 28) strains. The Lm isolates contained representatives of the six serogroups: 2A, 2B, 2C, 4B, NT, and 4bV/IVb-v1, with five strains for each serogroup except 4bV/IVb-v1 (n = 3). The results generated by 16 laboratories showed high sensitivity, specificity, and accuracy, generally ≥97%, for both the genus-species and serogrouping qPCRs. Results from one laboratory lowered the sensitivity of the non-Listeria group to 93%. These results indicated the method was highly reliable. However, only the previously evaluated serogroups were tested within the MLV panel, though there is the potential for other serogroup results. Sequence Read Archive (SRA) files for Lm isolates were evaluated to determine the frequency of other potential serogroup profiles. This effort identified a low percentage of isolates with atypical qPCR serogroups (0.30%) that are consistent with Lm and were generally associated with lineage II and the natural environment. In summary, the results indicate that the proposed qPCR method is reliable and has a high degree of sensitivity, accuracy, and specificity, while also decreasing hands-on analysis time and increasing throughput of the analysis

Teil 4 : Wasser sparen im Ackerbau

Wasser ist ein begrenzender Produktionsfaktor für den Ackerbau im Süden der Metropolregion Hamburg. Im Hinblick auf den Klimawandel und eine begrenzte Wasserverfügbarkeit muss das vorhandene Wasser effizienter genutzt werden. In KLIMZUG-NORD wurden hierzu im Rahmen von Feldversuchen verschiedene Anpassungsmaßnahmen erprobt