Geology. Canyon cutting on a grand time scale     

Atkinson T  Leeder M 《Science (New York, N.Y.)》2008,319(5868):1343-1344

  相似文献   

Incorrect comments regarding the use of butorphanol-medetomidine as a premedicant in cats     

Mike Davies 《The Journal of small animal practice》2009,50(7):378-378

  相似文献   

The incidence of honey bee pests and diseases in England and Wales   总被引：1，自引：0，他引：1  

Wilkins S  Brown MA  Cuthbertson AG 《Pest management science》2007,63(11):1062-1068

The Central Science Laboratory (CSL) National Bee Unit (NBU) has been responsible for maintaining the Integrated Bee Health Programme in England and Wales since the early 1990s. The role of the Bee Health Programme is to protect the honey bee, a major pollinator of agricultural and horticultural crops and wild flora, and to provide up-to-date technical support to beekeepers. The Bee Health Programme is funded in England by the Department for Environment, Food and Rural Affairs (Defra) and in Wales by the Welsh Assembly Government (WAG). The work includes inspection of honey bee colonies, disease and pest diagnosis, development of contingency plans for emerging threats, minimising the risk of introduction of potentially serious exotic pests and diseases through importation by import risk analysis and related extension work and consultancy services to both government and industry. There is also an underpinning programme of research and development.  相似文献   

Reducing insecticide and fungicide loads in runoff from plastic mulch with vegetative-covered furrows     

Rice PJ  Harman-Fetcho JA  Sadeghi AM  McConnell LL  Coffman CB  Teasdale JR  Abdul-Baki A  Starr JL  McCarty GW  Herbert RR  Hapeman CJ 《Journal of agricultural and food chemistry》2007,55(4):1377-1384

A common management practice for the production of fresh-market vegetables utilizes polyethylene (plastic) mulch because it increases soil temperature, decreases weed pressure, maintains soil moisture, and minimizes soil contact with the product. However, rain events afford much more erosion and runoff because 50-75% of the field is covered with an impervious surface. A plot study was conducted to compare and to quantify the off-site movement of soil, insecticides, and fungicides associated with runoff from plots planted with Sunbeam tomatoes (Lycopersicon esculentum Mill) using the conventional polyethylene mulch management practice vs an alternative management practice-polyethylene mulch-covered beds with cereal rye (Secale cereale) planted in the furrows between the beds. The use of cereal rye-covered furrows with the conventional polyethylene system decreased runoff volume by more than 40%, soil erosion by more than 80%, and pesticide loads by 48-74%. Results indicate that vegetative furrows are critical to minimizing the negative aspects of this management practice.  相似文献   

Developing nutrient profile models: a systematic approach     

Scarborough P  Rayner M  Stockley L 《Public health nutrition》2007,10(4):330-336

OBJECTIVE: Nutrient profiling can be defined as the 'the science of categorising foods according to their nutritional composition'. The purpose of the present paper is to describe a systematic and logical approach to nutrient profiling. DESIGN: A seven-stage decision-making process is proposed and, as an illustration of how the approach might operate in practice, the development of a nutrient profiling model for the purpose of highlighting breakfast cereals that are 'high in fat, sugar or salt' is described. RESULTS: The nutrient profile model developed for this paper calculates scores for foods using a simple equation. It enables breakfast cereals to be compared with each other and with other foods eaten at breakfast. CONCLUSION: Nutrient profiling is not new, but hitherto most nutrient profiling models have been developed in an unsystematic and illogical fashion. Different nutrient profiling models are needed for different purposes but a key requirement should be that they are developed using a systematic, transparent and logical process. This paper provides an example of such a process; approaches to validating nutrient profiling models are described elsewhere.  相似文献