Estimating biomass     

Botkin DB  Simpson LG  Schenk HJ 《Science (New York, N.Y.)》1992,257(5067):146

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Characteristics of phosphorus uptake kinetics of poinsettia and marigold     

Azizollah Khandan-Mirkohi  Manfred K. Schenk 《Scientia Horticulturae》2009

In a previous experiment it has been found that maximum uptake rate (I_max), Michaelis constant (K_m), and minimum nutrient concentration (C_min) as plant physiological characteristics may be important for phosphorus (P) uptake in peat-substrate. Thus, variation of P uptake parameters was evaluated with a series of depletion studies for poinsettia (Euphorbia pulcherrima) and marigold (Tagetes patula) under fluctuating climatic conditions and different developmental stages.  相似文献   

Pegasus joins the jet age     

PM ELLIS 《Australian veterinary journal》1998,76(7):476-477

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Attempted transmission of dermatophilosis in saltwater crocodiles (Crocodylus porosus)     

GN BUENVIAJE  PW LADDS  RG HIRST  PM SUMMERS  JM MILLAN 《Australian veterinary journal》1998,76(7):495-496

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The occurrence of equine arteritis virus in Australia   总被引：2，自引：0，他引：2  

PJ HUNTINGTON  AJ FORMAN†  PM ELLIS‡ 《Australian veterinary journal》1990,67(12):432-435

This paper reports the first isolation of equine arteritis virus (EAV) in Australia and serological evidence of exposure to EAV in Australian horses. Twelve Standardbred stallions imported from North America were found to shed EAV in semen. One hundred and seven stallions were tested for serum antibodies to EAV and 73% of Standardbred stallions tested were seropositive as compared to 8% of Thoroughbred stallions. Serum antibody was detected in 71% of Standardbred mares, 6% of Standardbred racehorses and 1% of Thoroughbred mares and racehorses. Examination of stored serums demonstrated that EAV had been present in Australia since at least 1975.  相似文献   

Primary intestinal lymphangiectasia in three dogs: a morphological and immunopathological investigation     

M M Suter  D G Palmer  H Schenk 《Veterinary pathology》1985,22(2):123-130

Morphological and immunological findings of three dogs with primary lymphangiectasia are described and compared with three normal dogs. Scanning electron microscopy showed distended and fused intestinal villi in dogs with intestinal lymphangiectasia, and morphometric evaluation revealed deeper crypts in the small intestine of dogs with intestinal lymphangiectasia. Although plasma cells of all classes were diminished in the cranial parts of the small intestine, there was an absolute and relative increase of immunoglobulin G-containing plasma cells in the caudal small intestine in dogs with intestinal lymphangiectasia.  相似文献   

Cyanidadsorption an Sesquioxiden,Tonmineralen und Huminstoffen     

Birgit Schenk  B. M. Wilke 《植物养料与土壤学杂志》1984,147(6):669-679

Cyanide adsorption on sesquioxides, clay-minerals and humic substances The adsorption of cyanide (KCN) on sesquioxides, clay minerals, and humic substances at different pH-values was studied. Moreover we looked for the CN-adsorption on L-layers of the humus forms mull, moder and mor. Cyanide was only adsorbed by humic acid. The amount of CN adsorbed increased with increasing pH of the reaction solution. IR-spectroscopic investigations of CN treated humic acids revealed that the cyanide was adsorbed at low pH (<7) as HCN-molecules by formation of hydrogen bonds with COOH-, COH-, OH- and NH₂-groups of the humic acid. At pH > 7 the cyanide was mainly adsorbed as CN^? by charge transfer with acceptor-molecules such as chinones. The cyanide adsorption of L-layers of humus forms decreased in the order mor > mull > moder. It is surmised that the HCN-molecules were not only adsorbed by humic acids in these layers but also by oxidation products of lignin, pectin, protein, cellulose, and carbon-hydrates of fulvic acids. Solutions of K₂HPO₄ did not desorb cyanides from humic acids to any great extent.  相似文献   

New horizons mapping of Europa and Ganymede     

Grundy WM  Buratti BJ  Cheng AF  Emery JP  Lunsford A  McKinnon WB  Moore JM  Newman SF  Olkin CB  Reuter DC  Schenk PM  Spencer JR  Stern SA  Throop HB  Weaver HA;New Horizons Team 《Science (New York, N.Y.)》2007,318(5848):234-237

The New Horizons spacecraft observed Jupiter's icy satellites Europa and Ganymede during its flyby in February and March 2007 at visible and infrared wavelengths. Infrared spectral images map H2O ice absorption and hydrated contaminants, bolstering the case for an exogenous source of Europa's "non-ice" surface material and filling large gaps in compositional maps of Ganymede's Jupiter-facing hemisphere. Visual wavelength images of Europa extend knowledge of its global pattern of arcuate troughs and show that its surface scatters light more isotropically than other icy satellites.  相似文献   

Io volcanism seen by new horizons: a major eruption of the Tvashtar volcano     

Spencer JR  Stern SA  Cheng AF  Weaver HA  Reuter DC  Retherford K  Lunsford A  Moore JM  Abramov O  Lopes RM  Perry JE  Kamp L  Showalter M  Jessup KL  Marchis F  Schenk PM  Dumas C 《Science (New York, N.Y.)》2007,318(5848):240-243

Jupiter's moon Io is known to host active volcanoes. In February and March 2007, the New Horizons spacecraft obtained a global snapshot of Io's volcanism. A 350-kilometer-high volcanic plume was seen to emanate from the Tvashtar volcano (62 degrees N, 122 degrees W), and its motion was observed. The plume's morphology and dynamics support nonballistic models of large Io plumes and also suggest that most visible plume particles condensed within the plume rather than being ejected from the source. In images taken in Jupiter eclipse, nonthermal visible-wavelength emission was seen from individual volcanoes near Io's sub-Jupiter and anti-Jupiter points. Near-infrared emission from the brightest volcanoes indicates minimum magma temperatures in the 1150- to 1335-kelvin range, consistent with basaltic composition.  相似文献   

Organic Glasses: A New Class of Photorefractive Materials     

PM Lundquist  R Wortmann  C Geletneky  RJ Twieg  M Jurich  VY Lee  CR Moylan  DM Burland 《Science (New York, N.Y.)》1996,274(5290):1182-1185

The performance of amorphous organic photorefractive (PR) materials in applications such as optical data storage is generally limited by the concentration of active molecules (chromophores) that can be incorporated into the host without forming a crystalline material with poor optical quality. In polymeric PR systems described previously, performance has been limited by the necessity of devoting a large fraction of the material to inert polymer and plasticizing components in order to ensure compositional stability. A new class of organic PR materials composed of multifunctional glass-forming organic chromophores is described that have long-term stability and greatly improved PR properties.  相似文献