Cutting balloon catheterization for interventional treatment of cor triatriatum dexter: 2 Cases     

Nicole LeBlanc  Teresa C. DeFrancesco  Allison K. Adams  Clark E. Atkins  Sandra P. Tou  James Curt Fudge  Bruce W. Keene 《Journal of Veterinary Cardiology》2012,14(4):525-530

Cutting balloon dilatation was performed successfully in two dogs with cor triatriatum dexter and clinical signs of ascites. The cutting balloon catheter uses incisional microtomes embedded in a balloon catheter. During balloon expansion, these microtomes incise the adjacent tissue, decreasing circumferential wall stress. This theoretically reduces both the likelihood of fracturing the adjacent tissues in an uncontrolled manner and the potential neoproliferative response to standard balloon dilatation and the subsequent incidence of re-stenosis. In both cases described, clinical signs resolved completely following cutting balloon dilatation of the anomalous membrane. Based on the outcome of these 2 cases, cutting balloon dilatation appears to be a viable treatment option for dogs affected with cor triatriatum dexter.  相似文献   

Employee Perception of a Mandated Helmet Policy at Vail Resorts     

Christopher B. Davis  Mark R. Brownson  Brent J. Levy  Morgan A. Valley  Bruce Evans  Steven R. Lowenstein 《The Forestry Chronicle》2012,23(2):192

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Impact of the New Zealand Emissions Trading Scheme on forest valuation     

Bruce Manley 《Forest Policy and Economics》2012,14(1):83-89

The New Zealand Emissions Trading Scheme poses challenges for forest valuation. A Faustmann Land Expectation Value (LEV) can be calculated for the two recurring cashflow streams — one associated with forestry operations and the other associated with annual carbon trading. However the requirement to surrender carbon units (a) for removals at the time of harvest; and (b) for the subsequent decay of residues, means that the carbon component of crop value is negative from about mid-rotation. This negative value persists after harvesting when there is no forestry crop value to offset it. An additional issue is determining the appropriate discount rate for cashflows arising from carbon trading. A complication is that although LEV and crop value decrease as discount rate increases, carbon value increases. This confirms that the preferred approach to deal with risk and uncertainty is to adjust cashflows rather than the discount rate.  相似文献   

Wind loading of trees: influence of tree size and competition     

Sophie E. Hale  Barry A. Gardiner  Axel Wellpott  Bruce C. Nicoll  Alexis Achim 《European Journal of Forest Research》2012,131(1):203-217

Wind damage to forests is an important ecological disturbance factor. At the same time, it can have serious economic consequences due to a reduction in timber production. Current models for predicting the risk of wind damage are useful, but generally only focus on the “mean” tree within uniform stands. This paper presents measurements made of wind loading on trees of different sizes within four forest stands of different structure and management history, but all well-acclimated to current wind conditions. Each tree demonstrated a linear relationship between the maximum hourly turning moment and the square of the average hourly wind speed at the canopy top; we defined this ratio (the gradient of the line M _max vs. u ²) as the turning moment coefficient (T _C). T _C was correlated with tree size, in a relationship that differed little between the four forest sites despite the differences between the stands. The relationship between T _C and individual tree competition within each stand was investigated, using both distance-independent and distance-dependent competition indices. All sites showed decreasing T _C with increasing competition. However, the relationships differed between sites and would also be expected to change through time for a single site. The distance-dependent indices offered no improvement over the simpler, non-spatial indices that required only a diameter distribution. We suggest how, subject to further work, the results presented could be applied to calculate the risk of wind damage to trees of different sizes within a forest stand, and how the risk of wind damage to individual trees might change in response to thinning.  相似文献   

Diagnostic Ophthalmology     

Bruce H. Grahn  Lynne S. Sandmeyer 《The Canadian veterinary journal. La revue veterinaire canadienne》2010,51(1):105-106

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Renin-angiotensin aldosterone profile before and after angiotensin-converting enzyme-inhibitor administration in dogs with angiotensin-converting enzyme gene polymorphism     

Darcy Adin  Clarke Atkins  Oliver Domenig  Teresa DeFrancesco  Bruce Keene  Sandra Tou  Joshua A. Stern  Kathryn M. Meurs 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2020,34(2):600-606

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Diagnostic Ophthalmology     

Bianca S. Bauer  Lynne S. Sandmeyer  Bruce H. Grahn 《The Canadian veterinary journal. La revue veterinaire canadienne》2015,56(9):989-990

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Wheat basal crop coefficients determined by normalized difference vegetation index     

Douglas J. Hunsaker  Paul J. Pinter Jr  Bruce A. Kimball 《Irrigation Science》2005,24(1):1-14

Crop coefficient methodologies are widely used to estimate actual crop evapotranspiration (ET_c) for determining irrigation scheduling. Generalized crop coefficient curves presented in the literature are limited to providing estimates of ET_c for “optimum” crop condition within a field, which often need to be modified for local conditions and cultural practices, as well as adjusted for the variations from normal crop and weather conditions that might occur during a given growing season. Consequently, the uncertainties associated with generalized crop coefficients can result in ET_c estimates that are significantly different from actual ET_c, which could ultimately contribute to poor irrigation water management. Some important crop properties such as percent cover and leaf area index have been modeled with various vegetation indices (VIs), providing a means to quantify real-time crop variations from remotely-sensed VI observations. Limited research has also shown that VIs can be used to estimate the basal crop coefficient (K _cb) for several crops, including corn and cotton. The objective of this research was to develop a model for estimating K _cb values from observations of the normalized difference vegetation index (NDVI) for spring wheat. The K _cb data were derived from back-calculations of the FAO-56 dual crop coefficient procedures using field data obtained during two wheat experiments conducted during 1993–1994 and 1995–1996 in Maricopa, Arizona. The performance of the K _cb model for estimating ET_c was evaluated using data from a third wheat experiment in 1996–1997, also in Maricopa, Arizona. The K _cb was modeled as a function of a normalized quantity for NDVI, using a third-order polynomial regression relationship (r ²=0.90, n=232). The estimated seasonal ET_c for the 1996–1997 season agreed to within −33 mm (−5%) to 18 mm (3%) of measured ET_c. However, the mean absolute percent difference between the estimated and measured daily ET_c varied from 9% to 10%, which was similar to the 10% variation for K _cb that was unexplained by NDVI. The preliminary evaluation suggests that remotely-sensed NDVI observations could provide real-time K _cb estimates for determining the actual wheat ET_c during the growing season.  相似文献   

The distribution and abundance of the banded and rufous hare-wallabies, Lagostrophus fasciatus and Lagorchestes hirsutus     

Jeff Short  Bruce Turner 《Biological conservation》1992,60(3):157-166

The only substantial wild populations of banded Lagostrophus fasciatus and rufous Lagorchestes hirsutus hare-wallabies occur on Bernier and Dorre Islands, off the coast of Western Australia. Banded hare-wallabies were widespread in southwestern Australia but have not been recorded there since 1906; rufous hare-wallabies had a broad distribution across arid Australia but now have a single mainland population in the Tanami Desert.

We assessed distribution and abundance of hare-wallabies on Bernier and Dorre Islands from spotlight sightings of animals on a series of east-west transects across each island. Abundance was estimated using line transects. The banded hare-wallaby is the more abundant species on both islands with a population of about 3,900 on Bernier and 3,800 on Dorre Island. This species depends on the shelter afforded by low-spreading shrubs of Heterodendrum oleifolium, Acacia coriacea, A. ligulata, Diplolaena dampiera, and Ficus platypoda. Wallabies occur mainly on the dunes that form the spine of Dorre Island and the travertine of its west coast. On Bernier Island they occur in the north, where dense thickets of Acacia coriacea, A ligulata, H. oleifolium and D. dampiera, and a tall heath of Abutilon exoneum and Scaevola crassifolia are best developed. The rufous hare-wallaby has a population of about 2,600 on Bernier and 1,700 on Dorre Island. It occurs throughout both islands in most habitats, but is most abundant in the south of each. It burrows extensively on the inland sandplain and in the dunes.  相似文献   

Robust and sensitive monoclonal enzyme-linked immunosorbent assay for the herbicide molinate   总被引：2，自引：0，他引：2  

Rufo C  Hammock BD  Gee SJ  Last JA  González-Sapienza G 《Journal of agricultural and food chemistry》2004,52(2):182-187

This paper reports on the generation of monoclonal antibodies and the development of a new enzyme-linked immunosorbent assay (ELISA) for the detection of molinate (S-ethyl hexahydroazepine-1-carbothioate). Hybridoma cells were generated using spleen and lymph node cells from a mouse immunized with S-2-carboxyethyl hexahydroazepine-1-carbothioate conjugated to keyhole limpet hemocyanin. After screening with a competitive ELISA, two monoclonal antibodies, mAbs 16C11 and 14D7, with IC(50) values of 82 +/- 2 and 173 +/- 8 ng/mL, respectively, were selected. MAb 16C11 can detect molinate concentrations of 1 ng/mL with no cross-reactivity to any other thiocarbamate pesticides; however, it was susceptible to the presence of organic solvents and to variation in buffer ionic strength. MAb 14D7 tolerated concentrations up to 5% of propylene glycol and 12.5% of acetonitrile in the assay buffer. The sensitivity of mAb 14D7 was further improved by decreasing the amount of coating antigen in the ELISA; the final inhibition assay showed an IC(50) of 69.2 +/- 1.4 ng/mL. In summary, mAb14D7 provided a more sensitive and robust assay, as compared with previous polyclonal antibody-based assays, with the additional advantage of being based upon a consistent and unlimited source of a defined reagent.  相似文献