TWO-YEAR NON-RECURRENCE RATES FOR EQUINE OCULAR AND PERIORBITAL SQUAMOUS CELL CARCINOMA FOLLOWING RADIOTHERAPY   总被引：1，自引：0，他引：1  

MICHAEL A. WALKER  DVM    DALLAS GOBLE  DVM    DENNIS GEISER  DVM 《Veterinary radiology & ultrasound》1986,27(5):146-148

Seventeen horses with a total of 18 ocular or periorbital squamous cell carcinomas were irradiated with Strontium-90 surface therapy, or Radon-222, Iodine-125, or Iridium-192 interstitial implants. Tumors were surgically cytoreduced prior to irradiation in all but two horses. Follow-up data was obtained for 2 years in each horse. Two-year-non-recurrence rates (no grossly visible evidence of tumor) were 87.5% for ⁹⁰Sr beta therapy, and 60% (70% when corrected for non-tumor-related deaths) for interstitial implant therapy. Data regarding frequency of occurrence, location of lesions, age of onset, and non-recurrence rates were similar to previous literature reports utilizing variable or shorter follow-up periods. The effects of cytoreductive surgery of the tumors was not studied.  相似文献   

Definition and use of the term 'pedoderm'     

P. H. WALKER  G. G. BECKMANN  R. BREWER 《European Journal of Soil Science》1984,35(3):505-510

A new system for soil studies has been proposed by Butler based on his earlier Kcycle concept. In doing so, he has re-defined ‘pedoderm’, the soil stratigraphic term originally defined in the Australian Soil-Stratigraphic Proposal (ASSP). Some aspects of soil stratigraphy are discussed and the ASSP outlined. From these considerations we conclude that the re-definition of pedoderm is inappropriate. We strongly recommend the original definition and usage of the term pedoderm. It was widely discussed among earth scientists and was developed by the careful testing of a number of alternative proposals. The term with its original definition has recently been adopted by the INQUA/Paleopedology Working Group on Soil Stratigraphy.  相似文献   

Micromorphology and sub-microscopy of allophane and imogolite in a podzol Bs horizon: evidence for translocation and origin   总被引：1，自引：0，他引：1  

V. C. FARMER  W. J. McHARDY    L. ROBERTSON  A. WALKER  M. J. WILSON 《European Journal of Soil Science》1985,36(1):87-95

In thin sections of a cemented Bs horizon, allophane is present as isotropic, or weakly anisotropic, transparent, yellow, commonly fluorescent gel deposits, which line or fill voids, cement sand and silt, and form pseudomorphs of root structures. Atomic ratios of Si: Al range from 1: 2.2 to 1: 3.7 in pale deposits, but drop to 1: 8.8 in regions of organic staining. Fe: Al atomic ratios in transparent deposits range from near zero to 0.4. The local uniformity of the gels indicates that the allophane, with associated iron oxides, is deposited from solution, and is not formed in situ from a precipitated organic complex, or by weathering of minerals in situ. Mineralogical evidence indicates that the origin of the allophane is related to intense acidic weathering of plagioclase and biotites in the Eg and Bhg horizons. A fibrous morphology indicative of imogolite is seen under the scanning electron microscope only in critical point dried specimens. It is proposed that the cracked coatings characteristic of cemented Bs horizons can be interpreted as allophanic deposits, associated with varying amounts of clay and iron oxide, and impregnated with varying amounts of fulvic acids. Such deposits cannot be taken as evidence for the migration of Al and Fe as organic complexes.  相似文献   

THE POTASSIUM STATUS OF SIX LOESSIAL SOILS OF CANTERBURY, NEW ZEALAND, IN RELATION TO RAINFALL AND RATE OF LOESS ACCUMULATION     

M. J. M. HAY  T. W. WALKER  A. F. R. ADAMS  A. S. CAMPBELL 《European Journal of Soil Science》1976,27(2):227-236

A selection of greywacke-derived loessial soils in Canterbury, New Zealand, was examined to test the hypothesis that soil K status is a function of soil-forming factors. Soils were selected such that factors besides loess accumulation and rainfall were relatively constant and the effects of each variable could be isolated. Soil K status was evaluated by plant, chemical, and X-ray diffraction techniques. With increasing rainfall and decreasing rate of loess accumulation soil K status decreased; there was a concurrent decrease in illite and increase in interstratified mineral content of the clay fraction.  相似文献   

TERRACE CHRONOLOGY AND SOIL FORMATION ON THE SOUTH COAST OF N.S.W.     

P. H. WALKER 《European Journal of Soil Science》1962,13(2):178-186

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SUSTAINABLE NITROGEN MANAGEMENT IN AUSTRALIAN AGROECOSYSTEMS: CHALLENGES AND OPPORTUNITIES     

Xia LIANG  Helen SUTER  Shu Kee LAM  Charlie WALKER  Roya KHALIL  Deli CHEN 《农业科学与工程前沿(英文版)》2022,9(3):366

● There is huge potential for improvement of nitrogen management in Australia. ● N management should incorporate environmental, social and economic sustainability. ● Agronomic, ecological and socioeconomic approaches and efforts are needed. Nitrogen is an essential nutrient that supports life, but excess N in the human-environment system causes multiple adverse effects from the local to the global scale. Sustainable N management in agroecosystems, therefore, has become more and more critical to address the increasing concern over food security, environmental quality and climate change. Australia is facing a serious challenge for sustainable N management due to its emission-intensive lifestyle (high level of animal-source foods and fossil fuels consumption) and its diversity of agricultural production systems, from extensive rainfed grain systems with mining of soil N to intensive crop and animal production systems with excessive use of N. This paper reviews the major challenges and future opportunities for making Australian agrifood systems more sustainable, less polluting and more profitable.  相似文献   

Manpower Forecasting for Small Regions     

GARY T. BARNES  G. DONALD JUD  JAMES L. WALKER 《Growth and change》1977,8(2):15-23

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Pyrrolizidine alkaloid poisoning in calves due to contamination of straw by Heliotropium europeum     

P. A. W. HARPER  K. H. WALKER  R. E. KRAHENBUHL  B. M. CHRISTIE 《Australian veterinary journal》1985,62(11):382-383

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Short-Bowel Syndrome in Four Dogs     

SUSAN R. YANOFF DVM  MS    MICHAEL D. WILLARD DVM  MS  Diplomate ACVIM    HARRY W. BOOTHE DVM  MS  Diplomate ACVS  MICHAEL WALKER DVM  Diplomate ACVR 《Veterinary surgery : VS》1992,21(3):217-222

Short bowel syndrome occurred in four dogs after extensive (74% to 88%) small intestinal resection. Weight loss and diarrhea were the principal clinical signs. Treatment was based on the severity of clinical signs. One dog is alive after 27 months. Three dogs died within 3 months. The prognosis depends on the extent and site of resection, degree of intestinal adaptation, preoperative condition, and postoperative care.  相似文献   

Effect of some substituted benzonitriles on photosynthetic activity of spinach and wheat in vivo and in vitro   总被引：1，自引：0，他引：1  

ZOLTÁN SZIGETI  ÉVA SÁRVÁRI  CLAIRE BUJTÁS† 《Weed Research》1981,21(1):37-41

The inhibitory effects of nine nitro and/or bromo-substituted benzonitrile compounds on the photosynthetic electron flow in isolated chloroplasts and on the in vivo CO₂ fixation of spinach (Spinacia oteracea L.) and wheat (Triticum aesticum L. cv. Bezoslaya) were investigated. Bromoxynil and 3-nitro-5-hromo-4-hydroxy-bcnzonitrile were the strongest and equally effective inhibitors of Ihe in vivo CO₂ fixation of spinach, hut in wheat the nitro-bromo-compound is ineffective and 3-nitro-benzonitrile is even more inhibitory than bromoxynil. None of the substances affected DCPIPH → methylviologen reduction. In the inhibition of the DCPIP reduction only the 3,5-disuhstituted 4-hydroxy-derivatives were effective. The fact that these compounds affect only the PS II reaction with both H₂O and DPC as electron donors suggests a site of inhibition on the reducing side of PS II, between Ihe PS II reaction centre and ihe DCPIP Site. It is suggested that in the inhibition of the DCPIP reduction only steric factors are important and the different electron configuration of the sterieally similar molecules may be involved only in the absorption and translocation processes of the compounds.  相似文献