Meticillin-resistant strains of Staphylococcus pseudintermedius in companion animals     

Steen S 《The Veterinary record》2011,168(2):53-54

Sheila Crispin is chair of the new Advisory Council on the Welfare Issues of Dog Breeding. Here, she describes the background to the Council, outlines its priorities and offers some thoughts on the issues that need to be addressed.  相似文献   

Response: mathematics education     

Steen LA 《Science (New York, N.Y.)》1987,238(4826):447-448

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The science of patterns     

Steen LA 《Science (New York, N.Y.)》1988,240(4852):611-616

The rapid growth of computing and applications has helped cross-fertilize the mathematical sciences, yielding an unprecedented abundance of new methods, theories, and models. Examples from statistical science, core mathematics, and applied mathematics illustrate these changes, which have both broadened and enriched the relation between mathematics and science. No longer just the study of number and space, mathematical science has become the science of patterns, with theory built on relations among patterns and on applications derived from the fit between pattern and observation.  相似文献   

THE 4C APPROACH AS A WAY TO UNDERSTAND SPECIES INTERACTIONS DETERMINING INTERCROPPING PRODUCTIVITY     

Eric JUSTES  Laurent BEDOUSSAC  Christos DORDAS  Ela FRAK  Gaetan LOUARN  Simon BOUDSOCQ  Etienne-Pascal JOURNET  Anastasios LITHOURGIDIS  Chrysanthi PANKOU  Chaochun ZHANG  Georg CARLSSON  Erik Steen JENSEN  Christine WATSON  Long LI 《农业科学与工程前沿(英文版)》2021,8(3):387

● The 4C approach considers intercropping performances as the result of joint 4C effects. ● Partial land equivalent ratios indicate which effect(s) are the major one(s). ● A major effect of complementarity is related to a better capture of abiotic resources. Modern agriculture needs to develop transition pathways toward agroecological, resilient and sustainable farming systems. One key pathway for such agroecological intensification is the diversification of cropping systems using intercropping and notably cereal-grain legume mixtures. Such mixtures or intercrops have the potential to increase and stabilize yields and improve cereal grain protein concentration in comparison to sole crops. Species mixtures are complex and the 4C approach is both a pedagogical and scientific way to represent the combination of four joint effects of Competition, Complementarity, Cooperation, and Compensation as processes or effects occurring simultaneously and dynamically between species over the whole cropping cycle. Competition is when plants have fairly similar requirements for abiotic resources in space and time, the result of all processes that occur when one species has a greater ability to use limiting resources (e.g., nutrients, water, space, light) than others. Complementarity is when plants grown together have different requirements for abiotic resources in space, time or form. Cooperation is when the modification of the environment by one species is beneficial to the other(s). Compensation is when the failure of one species is compensated by the other(s) because they differ in their sensitivity to abiotic stress. The 4C approach allows to assess the performance of arable intercropping versus classical sole cropping through understanding the use of abiotic resources.  相似文献   

You reap what you sow – or do you? – volunteers in organic row-sown and broadcast-sown oilseed rape fields     

Naja Steen Andersen  Jesper Rasmussen  Rikke Bagger Jørgensen 《European Journal of Agronomy》2010,32(2):121-126

The frequency and origin of oilseed rape volunteers in organic row and broadcast-sown oilseed rape fields was evaluated using DNA markers (ISSR) for analysis of potential volunteers in nine organic oilseed rape fields with different history. Using the software AFLPOP, the potential volunteers were assigned to variety by comparing their ISSR fingerprints with those of present and previous varieties. Results showed that two of the five row-sown fields, had high numbers of volunteer in the row (5 and 9 volunteers m^?2), and as inter-row volunteers were also present (0.9 and 3.6 volunteers m^?2), the recommended inter-row hoeing should not be neglected. Potential volunteers were also identified in the broadcast-sown fields, but their identity could not be proven. In a scenario where GM oilseed rape is cultivated previous to the organic oilseed rape, the present results indicate that the frequency of GM volunteers would exceed the threshold of 0.9%, and thus GM labelling would be demanded. Some of the volunteers belonged to varieties cultivated 8–11 years previously, indicating a long persistence of volunteer populations. What you reap might be added in the past – with consequences for organic farmers’ production and earning.  相似文献   

Seed transmission of Pepino mosaic virus in tomato     

Inge M. Hanssen  Rick Mumford  Dag-Ragnar Blystad  Isabel Cortez  Beata Hasiów-Jaroszewska  Dimitrinka Hristova  Israel Pagán  Ana-Maria Pereira  Jeff Peters  Henryk Pospieszny  Maja Ravnikar  Ineke Stijger  Laura Tomassoli  Christina Varveri  René van der Vlugt  Steen Lykke Nielsen 《European journal of plant pathology / European Foundation for Plant Pathology》2010,126(2):145-152

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Improved fixed-count stand-level estimators of stem density,mean diameter,and basal area     

Steen Magnussen 《European Journal of Forest Research》2016,135(1):191-202

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Demonstration of non-specific colitis and increased crypt depth in colon of weaned pigs with diarrhea     

Pedersen KS  Kristensen CS  Nielsen JP 《The Veterinary quarterly》2012,32(1):45-49

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Toxoplasma gondii associated behavioural changes in mice, rats and humans: evidence from current research     

Bech-Nielsen S 《Preventive veterinary medicine》2012,103(1):78-79

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Fate of N and C from labelled plant material: Recovery in perennial ryegrass–clover mixtures and in pore water of the sward     

Jim Rasmussen  Birgitte Gjettermann  Jrgen Eriksen  Erik Steen Jensen  Henning Hgh-Jensen 《Soil biology & biochemistry》2008,40(12):3031-3039

The belowground C and N dynamics leading to organic and inorganic N leaching from perennial ryegrass–clover mixtures are not well understood. Based on the hypothesis that four different plant materials would degrade differently, a 16 months field experiment was conducted to determine (i) the source strength of labelled plant residues in dissolved inorganic N (DIN) and dissolved organic N (DON) in pore water from the plough layer, and (ii) the plant uptake of organically bound N. Litterbags containing ¹⁴C- and ¹⁵N-labelled ryegrass or clover roots or leaves were inserted into the sward of a ryegrass–clover mixture in early spring. The fate of the released ¹⁴C and ¹⁵N was monitored in harvested biomass, roots, soil, and pore water percolating from the plough layer. No evidence of plant uptake of dual-labelled organic compounds from the dual-labelled residues could be observed. N in pore water from the plough layer during autumn and winter had a constant content of dissolved organic N (DON) and an increasing content of dissolved inorganic N (DIN). A positive correlation between aboveground clover biomass harvested in the growth season and total-N in pore water indicated that decaying roots from the living clover could be a major source of the 10 kg N ha⁻¹ being lost with pore water during autumn and winter. The presence of ¹⁵N in pore water shifted from the DON fraction in autumn to the DIN fraction in late winter, with strong indications that ¹⁵N originated from the living ryegrass. However, ¹⁵N in pore water originating from plant residues only constituted 1.5% of the total dissolved N from the plough layer.  相似文献