The elemental composition of asteroid 433 eros: results of the NEAR-shoemaker X-ray spectrometer     

Trombka JI  Squyres SW  Bruckner J  Boynton WV  Reedy RC  McCoy TJ  Gorenstein P  Evans LG  Arnold JR  Starr RD  Nittler LR  Murphy ME  Mikheeva I  McNutt RL  McClanahan TP  McCartney E  Goldsten JO  Gold RE  Floyd SR  Clark PE  Burbine TH  Bhangoo JS  Bailey SH  Petaev M 《Science (New York, N.Y.)》2000,289(5487):2101-2105

We report major element composition ratios for regions of the asteroid 433 Eros imaged during two solar flares and quiet sun conditions during the period of May to July 2000. Low aluminum abundances for all regions argue against global differentiation of Eros. Magnesium/silicon, aluminum/silicon, calcium/silicon, and iron/silicon ratios are best interpreted as a relatively primitive, chondritic composition. Marked depletions in sulfur and possible aluminum and calcium depletions, relative to ordinary chondrites, may represent signatures of limited partial melting or impact volatilization.  相似文献   

Electric charge,image-charge forces,and the deposition of pesticide drops     

H. Alastair McCartney  Terence Woodhead 《Pest management science》1983,14(1):49-56

A simulation model has been developed and used to assess the importance of induced image-charge forces in enhancing the deposition on plant stems and leaves of charged, as compared to uncharged, pesticide drops. The model, through calculations of the dynamics and trajectories of individual drops, allows separate determinations of enhancements of the deposit on the upper and lower leaf surfaces. Trajectories and rates of deposition were computed for water drops having diameters within the range 20 to 100 μm, for charges q between 0.1 and 1.0 times the maximum charge Q that can be retained on a drop of specified radius r, for wind speeds μo of the order of 0.1 to 1 .O ms^?1, and for plant stems (represented by vertical cylinders) 2 and 10 mm in diameter, and for plant leaves (horizontal plates) of various along-wind lengths I. It is shown that the rates of impaction to stems can be described in terms ot two dimensionless parameters that respectively relate to the properties of the particle and of the image force, and the rates of sedimentation to horizontal leaves in terms of the parameters q, r and l/μ_o. The model predicts that, inside crop canopies, considerable increases in the rates both of impaction and sedimentation can be achieved if drops, particularly small drops, can be given charges close to their respective Q. Thus for drops of 20 μm in diameter, sedimentation under typical within-canopy conditions is predicted to increase five-fold as a result of charging the drops, one-half of the enhanced deposit being on the underside of the leaves. For drops of 40 μ in diameter, predictions for the enhancement of deposition on the uppermost leaves of a field bean crop are shown to agree with published results from a field trial of an electrostatic crop spray system.  相似文献   

Hydrops foetalis in dwarf calves associated with twinning     

PAW HARPER  MR LATTER  JF WILKINS 《Australian veterinary journal》1995,72(6):236-238

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Bovine viral diarrhoea virus in beef heifers in commercial herds in Australia: mob‐level seroprevalences and incidences of seroconversion,and vaccine efficacy     

JM Morton  NJ Phillips  LF Taylor  MR McGowan 《Australian veterinary journal》2013,91(12):517-524

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Squamous cell carcinoma in a tuatara (Sphenodon punctatus)     

WD Roe  MR Alley  SM Cooper  L Hazley 《New Zealand veterinary journal》2013,61(5):207-210

CASE HISTORY: A mature male tuatara was presented with a history of recurrent cloacal prolapse.

CLINICAL AND PATHOLOGICAL FINDINGS: The prolapsed tissue included a 12 mm diameter mass, which histologically showed cords and nodules of neoplastic epithelial cells.

DIAGNOSIS: The mass was diagnosed as a squamous cell carcinoma with ulceration of the overlying stratified squamous epithelium and diffuse inflammation of the surrounding dermis.

CLINICAL RELEVANCE: This case presented a rare opportunity to investigate squamous cell carcinoma in a long-lived lower vertebrate species. Future recurrence or metastasis of the mass may add useful information to the current base of knowledge of the behaviour of malignant neoplasms in reptiles.  相似文献   

Bacterial sinusitis as a cause of beak deformity in an Antipodes Island parakeet (Cyanoramphus unicolor)     

BD Gartrell  MR Alley  T Kelly 《New Zealand veterinary journal》2013,61(4):196-198

CASE HISTORY: From 26 days of age, an Antipodes Island parakeet (Cyanoramphus unicolor) was noted to have a severe beak deformity and reduced bodyweight gain compared to its nest mate. The bird was euthanised at 43 days of age.

CLINICAL AND PATHOLOGICAL FINDINGS: The beak abnormality consisted of distortion of the right nares and severe shortening resulting in deviation of the upper maxilla to the right and cranially. On sectioning the head, copious mucoid material was found in the infraorbital sinus and the bony sinus architecture was disrupted. Histopathological examination of the infraorbital sinuses revealed a large focus of chronic but active inflammation, bony lysis on the right side and pockets of a mixed population of bacteria.

DIAGNOSIS: Severe beak deformity, likely secondary to bacterial sinusitis.

CLINICAL RELEVANCE: The case illustrates the need to look for underlying aetiologies to beak malformation, particularly in young parrots.  相似文献   

Disseminated mycosis in a Jackson's Chameleon (Chamaeloeo jacksonii)     

BD Gartrell  MR Alley  K Geschke 《New Zealand veterinary journal》2013,61(1)

Extract

An adult male Jackson's chameleon died with a history of intermittent periorbital swelling, anorexia and abnormal posture. On post mortem examination, there were multiple granulomas in the tongue, liver and soft palate. Histopathology revealed chronic granulomatous inflammation with yeast-like organisms and non-septate branching hyphae. Fungal cultures resulted in the growth of a Penicillium spp that could not be speciated further. The peri-orbital tissues contained a mix of necrotic bone and muscle. Sections of the brain showed three large adjacent focal areas of infarction. The kidneys showed acute nephritis and sclerotic glomeruli. The cytoplasm of some renal tubular epithelial cells contained highly eosinophilic granules. This ‘sexual segment granulation’ is normal in sexually active males of some lizard species.  相似文献   

Heat stress as a manageable risk factor to mitigate pneumonia in lambs     

H Black  MR Alley  KA Goodwin-Ray 《New Zealand veterinary journal》2013,61(1):91-92

Abstract

Extract

The paper by Goodwin et al (2004 Goodwin, KA, Jackson, R, Brown, C, Davies, PR, Morris, RS and Perkins, NR. 2004. Pneumonic lesions in lambs in New Zealand: patterns of prevalence and effects on production. New Zealand Veterinary Journal, 52: 175–9. [Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]) which appeared in the August 2004 issue of the New Zealand Veterinary Journal highlighted the prevalence and costs to the sheep industry of pneumonia in lambs. The costs are considerable, and the article begs the question, “what can sheep farmers do to reduce the effects of pneumonia in lambs?”  相似文献   

Erysipelothrix rhusiopathiae septicaemia in translocated kakapo (Strigops habroptilus)     

MR Alley  BD Gartrell  HJ Mack  CM McInnes 《New Zealand veterinary journal》2013,61(1)

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Aspergillosis in a North Island robin (Petroica longipes)     

M Low  Å Berggren  KJ Morgan  MR Alley 《New Zealand veterinary journal》2013,61(6):462-464

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