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No problem of resource or environmental management can be rationally addressed until its true space and time dimensions are known. The limitations of the universal soil loss equation and the wind erosion equation are such that we do not seem to have a truly informed idea of how much soil erosion is occurring in this country, let alone of the processes of sediment movement and deposition. The uncritical use of models is unacceptable as science and unacceptable as a basis for national policy. A comprehensive national system of monitoring soil erosion and consequent downstream sediment movement and/or blowing dust is critical. The costs would be significant; nevertheless, they would reflect efforts better focused on achieving better management of the United States' land and water resources. 相似文献
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SW PAGE 《Australian veterinary journal》1991,68(1):5-8
The use of chloramphenicol in the horse is now prohibited as horses are classified as food-producing animals. However, chloramphenicol has until recently been widely available for oral, intramuscular or intravenous administration. A critical appraisal of the published literature on the use of chloramphenicol in the horse clearly demonstrates that there are sound pharmacokinetic and microbiological reasons for concluding that chloramphenicol is not an appropriate antibiotic for systemic use. The short half-life of chloramphenicol in the horse, together with the broad range of minimum inhibitory concentrations of target pathogens, preclude the use of practical dosage regimens. It can be concluded that the withdrawal of chloramphenicol will have no adverse effects on chemotherapy in the horse. 相似文献
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A 16-year-old Quarter Horse gelding was presented to the Kansas State Veterinary Health Center for acute onset of diffuse, nonpruritic, generalised and coalescing urticaria. A single dose of dexamethasone resulted in resolution of the urticaria within 24 h; however, 48 h after discharge, he presented with mild colic. The patient was febrile and thoracic ultrasound was abnormal, evidenced by bilateral pleural echogenic irregularities, mild pulmonary consolidation and slight unilateral pleural effusion. Thoracic radiographs also revealed caudoventral soft tissue opacity in the same region of the ultrasonographic abnormalities. Transtracheal wash was performed and broad spectrum antimicrobials initiated. Poor clinical response to therapy and marked peripheral eosinophilia resulted in the necessity for bronchoalveolar lavage, which revealed a predominance of pulmonary eosinophils. A diagnosis of acute idiopathic eosinophilic pneumonia was made. Treatment included a tapering dose of dexamethasone over 4 weeks. Due to incomplete disease resolution, the patient was moved to an alternate environment which resulted in disease resolution. 相似文献
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Denudation studies: can we assume stream steady state? 总被引：1，自引：0，他引：1
Trimble SW 《Science (New York, N.Y.)》1975,188(4194):1207-1208
Contemporary stream sediment loads are dubious indicators of regional denudation. Recent analysis of ten river basins in the southeastern United States indicates that of the material eroded from upland slopes since European settlement, only about 5 percent has been exported. The remainder, alluvium and colluvium, will probably not be exported because of extensive reservoir impoundments. 相似文献
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TH Morris SW Paine PW Zahra EC Li SA Colgan SL Karamatic 《Australian veterinary journal》2020,98(12):578-585
Animals used in sport should be treated as required to ensure animal welfare but any such use of medication should also be controlled to ensure integrity. Pharmacokinetic studies on groups of six greyhounds were performed to measure plasma and urine levels of carprofen and firocoxib to inform medication control advice. Using the standard methodology for medication control the Irrelevant Plasma Concentration was determined as 20 and 2 ng/mL for carprofen and firocoxib, respectively. The Irrelevant Urine Concentration was also determined as 0.3 and 2 ng/mL for carprofen and firocoxib, respectively. These Irrelevant Plasma and Urine Concentrations will allow laboratory Screening Limits, Detection Times and Withdrawal Time advice to be determined and publicised by regulators of greyhound racing. The Screening Limits will also inform Recommended Limits of Detection if meat-containing residues of these medications are fed to greyhounds. 相似文献
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A. C. Trimble K. M. Delph E. R. Perry S. J. Valberg 《Equine Veterinary Education》2020,32(12):e235-e239
A 3-year-old Gypsy Vanner stallion was presented for evaluation of intermittent recumbency, muscle fasciculations, weakness, low head carriage, shifting of weight between the hindlimbs and an elevated tail head. History, physical examination and serum alpha tocopherol concentrations were suggestive of vitamin E deficiency and equine motor neuron disease (EMND). Sacrocaudalis dorsalis medialis muscle biopsy identified myositis secondary to sarcocystosis. Treatment with alpha tocopherol, ponazuril and sulfadiazine/pyrimethamine resulted in significant improvement in muscle weakness and body condition with resolution of sarcocystosis and inflammation on repeat muscle biopsy. This case illustrates the importance of muscle biopsy in horses with neuromuscular disease as concurrent diseases may be present that require specific treatment for a positive outcome. 相似文献
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NS Matthews SW Erickson GS Light MR Slater SM Hartsfield 《Veterinary anaesthesia and analgesia》1995,22(1):25-30
The effects of tolazoline (4.0 mg/kg iv) antagonism of detomidine (0.02 mg/kg iv) were evaluated in isoflurane-anaesthetised, ventilated ponies. Each of 6 ponies received both tolazoline and saline treatment during separate anaesthetic episodes only (no surgery was performed). Detomidine administration produced an increase in blood pressure, decrease in heart rate and decrease in PaO2 Tolazoline treatment transiently increased heart rate while blood pressure returned to baseline after both treatments. Arterial oxygenation decreased further after tolazoline treatment while oxgenation recovered towards baseline with saline treatment. No other cardiopulmonary effects were detected. Recovery from anaesthesia tended to be more rapid when detomidine was antagonized. The potential benefit of antagonizing detomidine-induced bradycardia with tolazoline, during isoflurane anaesthesia should be weighed against the potential to produce a decrease in arterial oxygenation. The mechanism for this effect is not clear. 相似文献