613 research outputs found
Wirtschaftlichkeit des Anbaukonzepts "Weite Reihe" im Getreidebau
Die EinfĂŒhrung der Weiten Reihe im Winterweizenanbau kann bei entsprechender Eignung des Standortes deutlich zur Verbesserung der ökonomischen Situation ökologisch bewirtschafteter Betriebe beitragen. Die mit der EinfĂŒhrung der Weiten Reihe erreichbaren Ziele wie z. B. QualitĂ€tsverbesserung, Steigerung der Bodenfruchtbarkeit oder die Verbesserung der Beikrautregulierung werden von den Betriebsleitern hinsichtlich ihrer Bedeutung in den jeweiligen Betrieben unterschiedlich bewertet. Dementsprechend fĂŒhren je nach betrieblicher Situation unterschiedliche Effekte zu einer vergleichsweise höheren RentabilitĂ€t des Weite-Reihe-Verfahrens.
Um zu einer abschlieĂenden Beurteilung der Eignung des Weite-Reihe-Verfahrens fĂŒr die verschiedenen Standorte zu kommen, sind Ergebnisse aus weiteren Erntejahren notwendig
Crystal Structure and Mossbauer Studies of the Lithium Hexacyanoferrate(III)-Hexamethylenetetramine Adduct Li3[Fe(CN)6] · 2C6H12N4 · 5H2O
Crystals of the adduct Li3[Fe(CN)6] · 2C6H12N4-5H2O are orthorhombic, space group I2mm, Z = 2, a = 909.4(5), b = 1046.1(5), c = 1455.8(5) pm. The structure may be regarded as a packing of Fe(CN)6 octahedra and hexamethylenetetramine molecules. The lithium ions are coordinated to nitrogen atoms of both groups and to water molecules. Mossbauer spectra have been recorded for the temperature range between 290 K and 77 K. At all temperatures the spectra show two doublets with nearly identical isomer shifts but different quadrupole splittings, thus indicating the presence of two kinds of hexacyanoferrate(III) ions with slightly different distortions of the ligand spheres around the Fe atoms. The effect is discussed on the assumption of a statistical distribution of one of the lithium ions
PraxiseinfĂŒhrung des Anbaukonzeptes Weite Reihe fĂŒr eine umweltgerechte Getreideproduktion unter besonderer BerĂŒcksichtigung des QualitĂ€tsaspektes bei Backweizen: Betriebswirtschaftliche Analyse
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PrĂŒfung und Entwicklung von Sojabohnenzuchtmaterial fĂŒr die FĂŒtterung mit dem Ziel der Implementierung mittelstĂ€ndischer ZĂŒchtungsaktivitĂ€ten unter besonderer BerĂŒcksichtigung der Merkmale FrĂŒhzeitigkeit, KĂ€ltetoleranz und Proteinertrag
Mit dem Vorhaben soll im Rahmen der EiweiĂstrategie des BMEL durch die StĂ€rkung der ZĂŒchtungswirtschaft eine Ausweitung und Verbesserung des Sojabohnenanbaus und damit der Produktion von gentechnikfreiem, heimischem EiweiĂfutter unterstĂŒtzt werden. An der Landesanstalt wird ein Soja-Zuchtprogramm neu aufgebaut. Im Verbund mit privaten bayerischen ZĂŒchtungsunternehmen werden Methoden zur Selektion von ZuchtstĂ€mmen bezĂŒglich der Merkmale FrĂŒhreife, Kornertrag, Proteinertrag und KĂ€ltetoleranz entwickelt, sowie die Grundlage fĂŒr eine markergestĂŒtzte Selektion geschaffen.
In den drei Vegetationsperioden (2015-2017) wurden aus ĂŒber zwölftausend Kreuzungsnachkommen interessante ZuchtstĂ€mme selektiert und in einer LeistungsprĂŒfung mit aktuellen Sorten in Ertrag, Proteingehalt und Abreife verglichen. Dabei konnten mehrere ZuchtstĂ€mme identifiziert werden, die bei hohem Ertrag frĂŒher abreifen als aktuelle Vergleichssorten bzw. höhere ProteinertrĂ€ge liefern. Das entwickelte Zuchtmaterial fand Eingang in die Zuchtprogramme bei den privaten Verbundpartnern und wird auf die Sortenzulassung vorbereitet.
Die molekulargenetischen Analysen auf der Basis von 6000 SNP-Markern zeigten eine nur geringe genetische DiversitĂ€t im aktuell genutzten Sortenpanel. Die in Clusteranalysen nachgewiesene groĂe genetische DiversitĂ€t in weltweiten Genbankakzessionen kann als wertvoller Genpool fĂŒr die ZĂŒchtung genutzt werden. Die aufwĂ€ndige phĂ€notypische Selektion soll langfristig durch molekulare Marker effizienter gestaltet werden. Der erste Schritt wurde mit der Etablierung und Anwendung publizierter Marker fĂŒr die Merkmale BlĂŒte und Reife gemacht
Options for accounting carbon sequestration in German forests
<p>Abstract</p> <p>Background</p> <p>The Accra climate change talks held from 21â27 August 2008 in Accra, Ghana, were part of an ongoing series of meetings leading up to the Copenhagen meeting in December 2009. During the meeting a set of options for accounting carbon sequestration in forestry on a post-2012 framework was presented. The options include gross-net and net-net accounting and approaches for establishing baselines.</p> <p>Results</p> <p>This article demonstrates the embedded consequences of Accra Accounting Options for the case study of German national GHG accounting. It presents the most current assessment of sequestration rates by forest management for the period 1990 â 2007, provides an outlook of future emissions and removals (up to the year 2042) as related to three different management scenarios, and shows that implementation of some Accra options may reverse sources to sinks, or sinks to sources.</p> <p>Conclusion</p> <p>The results of the study highlight the importance of elaborating an accounting system that would prioritize the climate convention goals, not national preferences.</p
Voraussetzungen und Gestaltungsmöglichkeit von Karten zur schadlosen Ablagerung von Abprodukten und zur Darstellung von havariegefÀhrdeten Gebieten: ein methodischer Beitrag zum praktischen Grundwasserschutz
Li dynamics in carbon-rich polymer-derived SiCN ceramics probed by nuclear magnetic resonance
We report Li, Si, and C NMR studies of two different
carbon-rich SiCN ceramics SiCN-1 and SiCN-3 derived from the preceramic
polymers polyphenylvinylsilylcarbodiimide and polyphenylvinylsilazane,
respectively. From the spectral analysis of the three nuclei at room
temperature, we find that only the C spectrum is strongly influenced by
Li insertion/extraction, suggesting that carbon phases are the major
electrochemically active sites for Li storage. Temperature and Larmor frequency
() dependences of the Li linewidth and spin-lattice relaxation
rates are described by an activated law with the activation energy
of 0.31 eV and the correlation time in the high temperature
limit of 1.3 ps. The power law dependence of on
which deviates from the standard Bloembergen, Purcell, and Pound (BPP) model
implies that the Li motion on the s timescale is governed by continuum
diffusion mechanism rather than jump diffusion. On the other hand, the rotating
frame relaxation rate results suggest that the slow motion of
Li on the ms timescale may be affected by complex diffusion and/or
non-diffusion processes.Comment: 28 pages with double line spacing, 7 figures and 2 tables, accepted
version in Journal of Power Source
Presence of Equine and Bovine Coronaviruses, Endoparasites, and Bacteria in Fecal Samples of Horses with Colic
Acute abdominal pain (colic) is one of the major equine health threats worldwide and often necessitates intensive veterinary medical care and surgical intervention. Equine coronavirus (ECoV) infections can cause colic in horses but are rarely considered as a differential diagnosis. To determine the frequency of otherwise undetected ECoV infections in horses with acute colic, fresh fecal samples of 105 horses with acute colic and 36 healthy control horses were screened for viruses belonging to the Betacoronavirus 1 species by RT-PCR as well as for gastrointestinal helminths and bacteria commonly associated with colic. Horses with colic excreted significantly fewer strongyle eggs than horses without colic. The prevalence of anaerobic, spore-forming, gram-positive bacteria (Clostridium perfringens and Clostridioides difficile) was significantly higher in the feces of horses with colic. Six horses with colic (5.7%) and one horse from the control group (2.8%) tested positive for Betacoronaviruses. Coronavirus-positive samples were sequenced to classify the virus by molecular phylogeny (N gene). Interestingly, in three out of six coronavirus-positive horses with colic, sequences closely related to bovine coronaviruses (BCoV) were found. The pathogenic potential of BCoV in horses remains unclear and warrants further investigation
Electrochemical Li Storage Properties of Carbon-Rich BâCâN Ceramics
Amorphous BCN ceramics were synthesized via a thermal conversion procedure of piperazineâborane and pyridineâborane. The synthesized BCâN and BCâN ceramics contained, in their final amorphous structure, 45 and 65 wt % of carbon, respectively. Elemental analysis revealed 45 and 65 wt % of carbon for BCâN and BCâN, respectively. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) confirmed the amorphous nature of studied compounds. Lateral cluster size of carbon crystallites of 7.43 and 10.3 nm for BCâN and BCâN, respectively, was calculated from Raman spectroscopy data. This signified a higher order of the carbon phase present in BCâN. The electrochemical investigation of the low carbon BCâN composition as anodes for Li-ion batteries revealed initial capacities of 667 and 235 mAh·gâ»Âč for lithium insertion/extraction, respectively. The material with higher carbon content, BCâN, disclosed better reversible lithium storage properties. Initial capacities of 1030 and 737 mAh·gâ»Âč for lithium insertion and extraction were recovered for carbon-rich BCâN composition. Extended cycling with high currents up to 2 C/2 D revealed the cycling stability of BC4N electrodes. Cycling for more than 75 cycles at constant current rates showed a stable electrochemical behavior of BCâN anodes with capacities as high as 500 mAh·gâ»Âč
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