Triplets in red deer (Cervus elaphus)   总被引：1，自引：0，他引：1  

JJ FYFF  MJ FYFFE 《Australian veterinary journal》1995,72(12):469-470

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Locomotor effects in sheep of alkaloids identified in Australian Tribulus terrestris     

CA BOURKE  GR STEVENS  MJ CARRIGAN 《Australian veterinary journal》1992,69(7):163-165

Fresh, mature, ungrazed Tribulus terrestris plant material was subjected to a standard alkaloid extraction procedure. The extract was fractionated by thin layer chromatography (TLC) and high performance liquid chromatography (HPLC). Two major alkaloid fractions were demonstrated. These fractions were identified by means of TLC, ultraviolet spectrofluorimetry (UVS) and HPLC, as the beta-carboline indoleamines harmane and norharmane. The extractable alkaloid content was determined to be 44 mg/kg dry matter. Synthetic harmane and norharmane were administered subcutaneously to sheep at a dose rate of 54 mg/kg. Both compounds caused similar nervous effects. The main effect observed was limb paresis, which in some sheep was body side blased. The clinical signs observed in the experimental sheep were consistent with those described for naturally occurring cases of Tribulus terrestris staggers. It was proposed that harmane and norharmane accumulate in tryptamine-associated neurones of the central nervous system, during months of tribulus ingestion, and gradually interact irreversibly with a specific neuronal gene DNA sequence.  相似文献   

The effect of lidocaine and ketamine on thermal thresholds in cats     

SA Robertson  PM Taylor  W Davies  MJ Dixon 《Veterinary anaesthesia and analgesia》2002,29(2):95-96

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Insuffisance de la valvule auriculo-vintriculaire droite chez une vache Holstein.          下载免费PDF全文

J M Bergeron 《The Canadian veterinary journal. La revue veterinaire canadienne》1972,13(7):167-169

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The Seismic Structure of the Sun     

DO Gough  AG Kosovichev  J Toomre  E Anderson  HM Antia  S Basu  B Chaboyer  SM Chitre  J Christensen-Dalsgaard  WA Dziembowski  A Eff-Darwich  JR Elliott  PM Giles  PR Goode  JA Guzik  JW Harvey  F Hill  JW Leibacher  MJPFG Monteiro  O Richard  T Sekii  H Shibahashi  M Takata  MJ Thompson  S Vauclair  SV Vorontsov 《Science (New York, N.Y.)》1996,272(5266):1296-1300

Global Oscillation Network Group data reveal that the internal structure of the sun can be well represented by a calibrated standard model. However, immediately beneath the convection zone and at the edge of the energy-generating core, the sound-speed variation is somewhat smoother in the sun than it is in the model. This could be a consequence of chemical inhomogeneity that is too severe in the model, perhaps owing to inaccurate modeling of gravitational settling or to neglected macroscopic motion that may be present in the sun. Accurate knowledge of the sun's structure enables inferences to be made about the physics that controls the sun; for example, through the opacity, the equation of state, or wave motion. Those inferences can then be used elsewhere in astrophysics.  相似文献   

The nutrient and glycoalkaloid content of a new potato meal     

Alfred A. Bushway  Jan L. Bureau  Donald Bergeron  Michael R. Stickney  Rodney J. Bushway 《American Journal of Potato Research》1985,62(6):301-306

The nutrient and glycoalkaloid content of a new potato meal produced as a by-product of starch manufacture using low temperature dehydration was determined. Comparisons were made between the new potato meal and the previously manufactured meal which was prepared by high temperature dehydration. The glycoalkaloid content of the new potato meal was 15.53mg α-chaconine and 4.75mg α-solanine per 100g meal compared to 15.79mg α-chaconine and 7.83mg α-solanine in the potato meal produced by high temperature dehydration. The new potato meal contained 2% more protein and 1.9, 3.4 and 1.2 times more niacin, riboflavin and thiamin, respectively than the previous by-product. The potassium and phosphorus concentrations were approximately 2.0 and 0.2%, respectively. Other minerals were found in lesser concentrations with the sodium content being only 7.4mg/100g potato meal. A 28g serving would provide approximately 5, 7 and 4% of the RDA for protein, niacin and thiamin, respectively.  相似文献   

Spatial attributes of fire regime in eastern Canada: influences of regional landscape physiography and climate     

Nicolas Mansuy  Yan Boulanger  Aurélie Terrier  Sylvie Gauthier  André Robitaille  Yves Bergeron 《Landscape Ecology》2014,29(7):1157-1170

The characterization of the fire regime in the boreal forest rarely considers spatial attributes other than fire size. This study investigates the spatial attributes of fires using the physiography of the landscape as a spatial constraint at a regional scale. Using the Canadian National Fire Database, the size, shape, orientation and eccentricity were assessed for 1,136 fires between 1970 and 2010 in Quebec’s boreal forest and were summarized by ecodistrict. These spatial metrics were used to cluster 33 ecodistricts into homogeneous fire zones and then to determine which environmental variables (climate, topography, hydrography, and surficial deposits) influence the spatial attributes of fires. Analyses showed that 28 out of 33 ecodistricts belonging to a given fire zone were spatially contiguous, suggesting that factors driving the spatial attributes of fire are acting at a regional scale. Indeed, the orientation and size of fires vary significantly among the zones and are driven by the spatial orientation of the landscape and the seasonal regional climate. In some zones, prevailing winds during periods conducive to fire events parallel to the orientation of the landscape may favour the occurrence of very large fires (>100,000 ha). Conversely, an orientation of the landscape opposite to the prevailing winds may act as a natural firebreak and limit the fire size and orientation. This study highlights the need to consider the synergistic relationship between the landscape spatial patterns and the climate regime over the spatial attributes of fire at supra-regional scale. Further scale-dependant studies are needed to improve our understanding of the spatial factors controlling the spatial attributes of fire.  相似文献   

Spatial and temporal heterogeneity of forest site productivity drivers: a case study within the eastern boreal forests of Canada   总被引：1，自引：0，他引：1  

Kenneth A. Anyomi  Frédéric Raulier  Yves Bergeron  Daniel Mailly  Martin P. Girardin 《Landscape Ecology》2014,29(5):905-918

Forest productivity is driven by a suite of direct climatic and non-climatic factors that are transient or permanent. The kind of productivity driver and the nature of their effects vary by species, and scale dependencies potentially complicate these relationships. This study explored productivity-driver relations in eastern Boreal Canada and determined spatial effects in productivity control when expressed with stand dominant height at a reference age (site index). Data from 4,217 temporary sample plots obtained from boreal mixedwood and conifer bioclimatic domains, and with varied species composition, were used in this study. A single-level global model that assumes equal sensitivities across spatial scales was calibrated and compared with three alternative models reflecting different hypotheses on possible spatial heterogeneities. Alternative models were calibrated by plot-level soil deposit types (microscale), landscape dominant deposits (mesoscale) and bioclimatic domains (macroscale). A marked difference between the global and alternative models was observed, suggesting that a single global model does not sufficiently reflect existing heterogeneity in productivity-driver relationships. A combination of macro- and microscale models provided the best explanation of site index. Results further showed that site index is mainly driven by species composition (complementarity effects of aspen and jack pine compositions) and stand diameter structural diversity effects. It is concluded that successional changes, more than direct climatic effects, drive productivity.  相似文献   

Public awareness in New Zealand of animal welfare legislation relating to cats     

MJ Farnworth  J Campbell  NJ Adams 《New Zealand veterinary journal》2013,61(4):213-217

Abstract

AIMS: To ascertain the levels of awareness of legislation governing the welfare of cats, and provision of basic care, including vaccination, by cat-owners within two locations in New Zealand. To assess the ability of respondents to differentiate between the terms ‘stray’ and ‘feral’.

METHODS: A face-to-face questionnaire, consisting of 12 questions in three sections, was distributed by volunteers within Auckland (n=255) and Kaitaia (n=99) to gather information pertinent to the study's aims. Section 1 covered respondents’ personal details; Section 2, ownership and care of cats, including whether or not the cats were vaccinated against feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV); and Section 3, awareness of legislation and differences between the terms ‘stray’ and ‘feral’.

RESULTS: Overall, fewer than half of respondents were aware of the animal welfare legislation within New Zealand or the semantic differences between the terms ‘stray’ and ‘feral’ as they appear in the dictionary. Respondents ≥41 years old, and individuals employed in the animal-related sector, were significantly more likely to be aware of the legislation and make the correct distinction between the terms compared with those aged ≤40, and those working in a non-animal-related profession.

A significantly greater percentage of cat-owners (42%) provided care for cats they did not own compared with non-owners (26%). Results also indicated a large majority of cat-owners may consider standard annual vaccinations to include vaccination against FIV and FeLV.

CONCLUSION: Dissemination of information about animal welfare legislation is important for the care of cats within New Zealand, and the definitions of the terms ‘stray’ and ‘feral’ need to be more clearly stated in order to prevent confusion. This is especially important when cats may be controlled using lethal measures under different legislative precedents that are not necessarily consistent with one another.

CLINICAL RELEVANCE: Veterinary clinics may act as a primary source for the dissemination of information about relevant welfare acts as well as preventative health care, thus improving the welfare of cats. Cat-owners need to be better educated about the diseases covered by annual vaccination.  相似文献   

Placebo-controlled double-blind clomipramine trial for the treatment of anxiety or fear in beagles during ground transport     

Frank D  Gauthier A  Bergeron R 《The Canadian veterinary journal. La revue veterinaire canadienne》2006,47(11):1102-1108

The purpose of this explorative study was, first, to document changes in physiological parameters and behavior observed in dogs following ground transport and, second, to measure the effects on the above variables of a short-term administration of clomipramine, anecdotally already prescribed in private veterinary practice to reduce fear, anxiety, or both. Twenty-four beagles were randomly allocated to either clomipramine (2 mg/kg, q12h for 7 d) or placebo treatment, and then transported 3 times in a truck for 1 hour. Physiological parameters (cortisol, neutrophil:lymphocyte (N:L) ratio, heart rate) and behavior were recorded and analyzed. Clomipramine significantly reduced plasma cortisol (P < 0.05) following transport and tended (P = 0.07) to reduce N:L ratio. Clomipramine tended to only reduce "moving and panting" and drooling. Short-term administration of clomipramine appears to slightly reduce fear, anxiety, or both during transport. More research is needed to confirm the efficacy of this treatment and the appropriate dosage.  相似文献