排序方式： 共有24条查询结果，搜索用时 31 毫秒
1.
Definitions of the notions of soil resilience and degradation of the soil-vegetation cover are suggested. These problems are considered with respect to vulnerable tundra ecosystems. The analysis of available experimental data made it possible to obtain empirical equations characterizing the relationships between the plant productivity and the soil properties. These equations can be used to predict the degree of soil degradation under particular types of technogenic loads and the soil and vegetation potential for the natural restoration or artificial rehabilitation of the soil-vegetation cover in tundra ecosystems. The results obtained can be applied for the development of optimal nature management strategies in the areas of oil and gas fields in the north. 相似文献
2.
Booth AJ Stogdale L Grigor JA 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(1):2-6
Salmon poisoning disease in dogs has previously been reported in North America only along the western coast of the U.S.A. This paper presents the findings from eight affected dogs recently diagnosed on Vancouver Island, Canada. The clinical signs shown by these dogs were lethargy, anorexia, pyrexia and lymph node enlargement. The causative agent, Neorickettsia helminthoeca was observed in macrophages obtained from lymph node aspirates. This organism is transmitted to dogs in cysts of the fluke Nanophyetus salmincola salmincola within the tissues of the salmon or trout. The presence of fluke eggs in the feces of dogs showing typical signs is very suggestive of a diagnosis of salmon poisoning disease. Appropriate treatment, including chloramphenicol or oxytetracycline and fluid therapy, resulted in recovery. Prevention of salmon poisoning disease in endemic areas can be achieved by advising owners against allowing their dogs to eat raw salmon or trout. We suggest, based on the diagnoses made in these eight dogs, that Vancouver Island now be considered an endemic area for salmon poisoning disease. 相似文献
3.
V. Ya. Grigor’ev 《Eurasian Soil Science》2007,40(11):1217-1226
Semi-empirical equations for describing the erosive and transporting capacities of low-depth flows with account for their interaction with eroded soil were developed and experimentally and theoretically substantiated. These equations can form the basis for a unified model of rill erosion under irrigation, rainfall, and snowmelt runoff conditions. 相似文献
4.
Snejana Doncheva Zlatimira Stoyanova Katya Georgieva Dimitrina Nedeva Rumyana Dikova Grigor Zehirov Ana Nikolova 《植物养料与土壤学杂志》2006,169(2):247-254
The effect of copper (Cu) excess (1.5, 4.7, 31, 78, 156 μM) and exogenously supplied succinate on plant growth, chlorophyll content, chlorophyll fluorescence, and isoenzym profiles of some antioxidant enzymes in maize plants was studied. Excessive Cu supply led to a reduction in the relative growth rate (RGR), tolerance index (TI), chlorophyll a and chlorophyll b contents, and the quantum yield of PSII electron transport in the light‐adapted state (ΦPSII). Copper treatment induced several changes in the anionic and cationic peroxidases (PODs), as well as superoxide dismutase (SOD) isoenzyme profiles. After 8 d of 78 μM–Cu treatment, two new anionic and two new cationic peroxidase isoenzymes in the roots were registered. Copper applied at concentrations above 31 μM resulted in higher levels of manganese superoxide dismutase (Mn‐SOD) in the roots and Cu,Zn‐superoxide dismutase (Cu,Zn‐SOD) in the leaves. However, the addition of Na‐succinate (200 μM) to the root medium prior to Cu treatment increased the capacity of the plants to partially overcome Cu toxicity. 相似文献
5.
A procedure was developed on the basis of the experimental-theoretical equation for calculating the parameters of soil erosion resistance (the bottom eroding velocity of flow), the principles of the erosion resistance theory, the experimentally obtained relationships between the main erosion parameters of Tajikistan soils (the size of water-stable aggregates and their cohesion), and other properties (the initial water content, the lumpiness, the contents of physical clay and humus, the porosity ratio, and the lower plasticity limit). For practical purposes, a simpler procedure is recommended to evaluate and map the erosion resistance of irrigated lands in the areas of typical serozems and mountain cinnamonic soils of Tajikistan from minimum initial information (the texture, lumpiness, and density of the soils and the content of plant roots). 相似文献
6.
7.
S. V. Grigor’ev T. V. Shelenga V. S. Baturin Yu. V. Sarana 《Russian Agricultural Sciences》2010,36(4):262-264
The composition and content of fatty acids in oil of ruderal hemp seeds collected in the Volga, Southern, Urals, Siberian,
and Far Eastern federal districts are studied. The content of tetrahydrocannabinol is assessed. 相似文献
8.
H R Fischman J K Grigor J T Horman E Israel 《Journal of the American Veterinary Medical Association》1992,201(12):1883-1886
The epizootic of rabies in raccoons entered Maryland in 1981 and systematically moved through the state affecting raccoons in all counties except those of the lower Eastern Shore. A precoded surveillance form was provided to all county and city health departments and data were requested for each animal head submitted for testing for the year 1985. The disease persisted and, in 1987, all counties previously reporting rabies in raccoons also had documented cases in other species. The incidence of rabies in raccoons increased in late winter and peaked in March. Most human exposures occurred during daylight hours and in private yards. Agricultural areas were similarly affected by rabid animals. Analysis of vaccination status of animals exposed to rabid animals gave estimations of statewide vaccination rates for dogs (70%) and cats (28%). The danger of rabies in cats was emphasized by the large number of animals exposed by each rabid cat. The spillover of rabies in raccoons to other species persisted in all jurisdiction through 1992, with periodic upsurges of disease at 3- to 4-year intervals as the raccoon population is replenished. Rabies was not diagnosed in any human beings. 相似文献
9.
V. Ya. Grigor’ev M. S. Kuznetsov D. R. Abdulkhanova O. A. Bazarov 《Eurasian Soil Science》2008,41(3):302-311
A procedure was developed for calculating the size of detached and transported soil particles (aggregates), their fractional distribution, and the eroding velocities in the region of low hydrodynamic impacts of shallow flows based on the examination of pulsation of bottom velocities and soil heterogeneity in terms of aggregate composition and cohesion. The procedure was tested under field conditions for the rill erosion of soils in Tajikistan and Uzbekistan. 相似文献
10.
Sarah Schroeder John M. Grigor Constantinos E. Stathopoulos Anne Savage Philip Cassidy Stefan Toepfl Jonathan D. Wilkin 《Aquaculture International》2018,26(6):1353-1363
The aim of this study was to determine the influence of the fillet structure on the deboning force required to remove salmon and trout pin bones. Salmon and trout fillets with differing fillet structure were used, in order to study the importance of the fillet structure on the deboning process. In the first test naturally gaping and non-gaping fillets were compared. To confirm the role that the collagen plays within the fillet structure, the fillets underwent series of treatments. Fillets were put into (i) a collagenase solution to remove the collagen in the fillet and (ii) a calcium chloride solution to determine if collagen was the main influential factor. Both treated salmon and trout fillets were again compared to untreated fillets from the same batch. The results indicate that collagenase and calcium chloride have a large interaction on deboning force compared to water or no treatments. 相似文献