Localized demodicosis due to Demodex cati on the muzzle of two cats treated with inhalant glucocorticoids     

Petra Bizikova 《Veterinary dermatology》2014,25(3):222-e58

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Imperceptible stimuli and sensory processing impediment     

Blankenburg F  Taskin B  Ruben J  Moosmann M  Ritter P  Curio G  Villringer A 《Science (New York, N.Y.)》2003,299(5614):1864

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Efficient inhibition of the Alzheimer's disease beta-secretase by membrane targeting     

Rajendran L  Schneider A  Schlechtingen G  Weidlich S  Ries J  Braxmeier T  Schwille P  Schulz JB  Schroeder C  Simons M  Jennings G  Knölker HJ  Simons K 《Science (New York, N.Y.)》2008,320(5875):520-523

beta-Secretase plays a critical role in beta-amyloid formation and thus provides a therapeutic target for Alzheimer's disease. Inhibitor design has usually focused on active-site binding, neglecting the subcellular localization of active enzyme. We have addressed this issue by synthesizing a membrane-anchored version of a beta-secretase transition-state inhibitor by linking it to a sterol moiety. Thus, we targeted the inhibitor to active beta-secretase found in endosomes and also reduced the dimensionality of the inhibitor, increasing its local membrane concentration. This inhibitor reduced enzyme activity much more efficiently than did the free inhibitor in cultured cells and in vivo. In addition to effectively targeting beta-secretase, this strategy could also be used in designing potent drugs against other membrane protein targets.  相似文献   

Growth, P uptake and rhizosphere properties of intercropped wheat and chickpea in soil amended with iron phosphate or phytate     

Dongmei Wang  Petra Marschner  Zakaria Solaiman 《Soil biology & biochemistry》2007,39(1):249-256

Intercropping has been shown to increase total yield and nutrient uptake compared to monocropping. However, depending on crop combinations, one crop may dominate and decrease the growth of the other. Interactions in the soil, especially in the rhizosphere, may be important in the interactions between intercropped plant genotypes. To assess the role of the rhizosphere interactions, we intercropped a P-inefficient wheat genotype (Janz) with either the P-efficient wheat genotype (Goldmark) or chickpea in a soil with low P availability amended with 100 mg P kg⁻¹ as FePO₄ (FeP) or phytate. The plants were grown for 10 weeks in pots where the roots of the genotypes could intermingle (no barrier, NB), were separated by a 30 μm mesh (mesh barrier, MB), preventing direct root contact but allowing exchange of diffusible compounds and microorganisms, or were completely separated by a solid barrier (SB). When supplied with FeP, Janz intercropped with chickpea had higher shoot and grain dry weight (dw) and greater plant P uptake in NB and MB than in SB. Contact with roots of Janz increased shoot, grain and root dw, root length, shoot P concentration and shoot P uptake of chickpea compared to SB. Root contact between the two wheat genotypes, Janz and Goldmark, had no effect on growth and P uptake of Janz. Shoot and total P uptake by Goldmark were significantly increased in NB compared to MB or SB. In both crop combinations, root contact significantly increased total plant dw and P uptake per pot. Plant growth and P uptake were lower with phytate and not significantly affected by barrier treatment. Differences in microbial P, available P and phosphatase activity in the rhizosphere among genotypes and barrier treatments were generally small. Root contact changed microbial community structure (assessed by fatty acid methyl ester (FAME) analysis) and all crops had similar rhizosphere microbial community structure when their roots intermingled.  相似文献   

Veränderungen physikalischer Bodenmerkmale im „Statischen Düngungsversuch”︁ während einer Vegetationsperiode     

Peter Leinweber  Petra Kahle  Martin Krschens 《植物养料与土壤学杂志》1997,160(2):323-326

Temporal variations of physical soil properties in the “Static Fertilization Experiment” The objective of the present paper was to observe short-term changes in physical soil properties of a differently fertilized loess-Chernozem. Samples were taken weekly from the plots with 17.2 g C_org kg^?1 (unfertilized) and 25.0 g C_org kg^?1 (NPK + farmyard manure) of the “Static Fertilization Experiment”, Bad Lauchstädt, and their moisture contents (θ), bulk densities (?_d) and particle densities (?_s) were determined. The soil moisture contents showed very similar variations in the two treatments. Clear differences between the unfertilized (≈ 16 Vol.-%) and the NPK + farmyard manure treatment (≈ 10 Vol.-%) only occurred during summer (means 25th–29th week). The values for ?_d were lower in the NPK + farmyard manure plot (mean: –0.10 g cm^?3). Similar short-term changes in ?_d were found in both treatments and correlated to both, organic matter contents and composition (C_org, N_t, C/N). These data, however, gave no indication of reasons for the short-term changes in particle densities up to 0.09 g cm^?3.  相似文献   

Eigenschaften von Böden unterschiedlicher Nutzung im Stadtgebiet von Rostock     

Petra Kahle  Ellen Coburger 《植物养料与土壤学杂志》1996,159(6):637-642

Qualitative properties of soils in the urban area of Rostock different in use With the purpose of mapping urban soils in Rostock, Northern Germany. extensive investigations determining the presence, the genesis and the properties of natural and man-influenced soils were realized. In the following article selected chemical and physical properties of soils different in use situated on garden-, park-, graveyard-sites and living areas were shown and discussed. The positive influence on the pH-value in living areas of the city centre, deep enrichment of humus under garden use and the tendencies to soil acidification in sandy soils of park sites were emphasized.  相似文献   

Soil and water conservation in ethiopia     

Mahdi Osman  Petra Sauerborn 《Journal of Soils and Sediments》2001,1(2):117-123

The article shows results of an international and interdisciplinary project with the title ‘Rainfall and its Erosivity in Ethiopia’. The article contains information about the traditional soil conservation practices, the reasons for intervention with traditional soil conservation technologies, the historical background of instutionalized soil conservation activities, the institutional frame work for soil conservation activities and their achievements, and the different departments and organisations for soil and water conservation as far as soil erosion in Ethiopia is concerned. As a conclusion and recommendation, the major constraints of the past activities and the current situation including future trends were discussed.  相似文献   

Interactions between soil micro- and mesofauna and plants in an ecofarming system     

Jacqueline Becker  Petra Makus  Stefan Schrader   《European Journal of Soil Biology》2001,37(4)

Interactions between crops and soil micro- and mesofauna within the root zone were investigated under field conditions on sandy loam on a larger spatial scale and in columns in the laboratory on a smaller spatial scale. During the vegetation period of summer wheat from April to July 1999 soil samples were taken monthly directly from the root zone within plant rows and between plant rows hardly penetrated by roots. Abundances of Enchytraeidae, Collembola, soil flagellates, enzyme activities and contents of total carbon and nitrogen were determined. Additionally, a laboratory experiment was carried out with soil columns. Soil from the field was defaunated and inoculated with soil fauna (Enchytraeidae, Collembola, earthworms) in different combinations. Furthermore, summer wheat was sown. Enzyme activities, soil flagellate abundance and contents of total carbon and nitrogen were measured after 2, 6 and 14 weeks. Our field results revealed considerable interactions between plant roots, sampling date and soil layer affecting Enchytraeidae and Collembola. Within plant rows flagellate numbers correlated higher with N_t and C_t than between plant rows. In the laboratory close relationships between soil fauna as well as enzyme activities and nutrients contents were found within the root zone.  相似文献   

Isoenzymes and their Importance for Breeding Autopolyploids     

K. Skiebe  Petra  Seliger 《Plant Breeding》1990,105(2):106-111

Isoenzyme analyses have been carried out in polyploid rye. Taking into consideration zymograms at the diploid level, conclusions can be drawn concerning the genetics of band positions and band intensity. This is rather clear with the aspartate aminotransferase and the NAD-specific aromatic alcohol dehydrogenase. For both isoenzymes one gene locus with two alleles is responsible in the zones analyzed. In both cases a superdominance is assumed. Thereby nulliplex-, simplex-, duplex-, triplex- and quadru-plex types can be distinguished. For the banding pattern with the leucine aminopeptidase two gene loci with two alleles each are responsible. With allelic interaction codominance is supposed. On this base it is possible to differentiate between homozygosity and heterozygosity. Difficulties in autopolyploid breeding can be overcome by means of genetically-analyzed isoenzymes as markers. This is demonstrated by examples.  相似文献   

Cutaneous polyautoimmunity in two unrelated dogs: pemphigus foliaceus and generalized discoid lupus erythematosus     

Britt J. Levy  Keith E. Linder  Lisa B. Mamo  Ina Herrmann  Petra Bizikova 《Veterinary dermatology》2020,31(4):325-e84

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