Role of wheat root exudates in associative nitrogen fixation     

S.M. Beck  C.M. Gilmour 《Soil biology & biochemistry》1983,15(1):33-38

Root exudates and related exudate diffusion gradients were studied using ¹⁴C-radioisotope techniques. With inoculated wheat plants (Triticum aestivum cv. Nugaines), 3.7% of the ¹⁴C-labeled photosynthate was released as soluble exudate whereas 3.0% was found with axenic plants. Root surface areas averaged 54 cm² plant^?1. The microbial cells produced were sufficient to colonize 7.4%, of the root surface with a cell monolayer. Gradient studies showed that with inoculated root systems, rapid utilization of soluble exudate markedly decreased the distance of exudate diffusion. Microbial colonization also was a function of the physiological features of the test culture. The relationship between root colonization, exudate production and potential for associative nitrogen fixation is discussed.  相似文献   

Attempt to prevent the effects of experimental chronic pneumonia in sheep by vaccination against Pasteurella haemolytica     

G E Jones  W Donachie  J S Gilmour  A G Rae 《The British veterinary journal》1986,142(2):189-194

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A negative serological relationship between cases of grass sickness in Scotland and Clostridium perfringens type A enterotoxin     

J S Gilmour  R Brown  P Johnson 《Equine veterinary journal》1981,13(1):56-58

In an attempt to compare the equine grass sickness as reported in Europe with that described in the Republic of Colombia, sera from horses experiencing grass sickness in Scotland were used in neutralisation tests with Clostridium perfringens type A enterotoxin. The sera, from acute and chronic cases of the disease, failed to neutralise either crude or partially-purified enterotoxin. Neither were precipitin lines formed when the sera were treated against the toxin in immunoelectrophoresis. These results suggest that grass sickness in Europe and the equine disease in Colombia have a different aetiology.  相似文献   

Characterisation of compounds isolated from the sera of horses with acute grass sickness     

A D Pemberton  J C Hodgson  J S Gilmour  D L Doxey 《Research in veterinary science》1990,49(3):315-318

Isolates were prepared from the sera of 12 horses with acute grass sickness, using methods reported to yield serum fractions associated with neurotoxicity, and their components identified by liquid chromatography and spectroscopy. All isolates were found to contain cortisol and six isolates also contained a degradation product of an analgesic drug, dipyrone. However, no recognised neurotoxin was detected.  相似文献   

Decision factors in barley mildew control in South-East Scotland     

James Gilmour 《Pest management science》1978,9(3):229-233

The use of a mildew-susceptible barley variety, Golden Promise, has drawn attention to the problem of mildew in south-east Scotland. The increased intensity of disease has also influenced the potential value of the more resistant varieties. Whilst it is not possible to evaluate all the significant factors which result in severe mildew situations, the recommendation that winter barley should not be grown is thought to reduce the overwintering levels of disease. Trials have shown the benefits to be derived from using fungicidal seed treatments on a susceptible variety, although similar effects have also been found with single sprays. In this case, however, problems of timing and damage caused by wheelings have to be considered. In economic terms the many factors associated with barley mildew lead one to the view that blanket recommendations are inappropriate. Risk analyses are being considered as an aid to the decision making.  相似文献   

Serotypes of Pasteurella haemolytica from cattle     

M Quirie  W Donachie  N J Gilmour 《The Veterinary record》1986,119(4):93-94

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Pasteurellosis in sheep   总被引：1，自引：0，他引：1  

N J Gilmour 《The Veterinary record》1978,102(5):100-102

Pasteurellosis is an important cause of economic loss to the sheep industry. There are two distinct syndromes. The pneumonic form of the disease caused by P haemolytica biotype A occurs as pneumonia in flocks and sporadically in individual sheep. The septicaemic form, caused by P haemolytica biotype T is associated with hyper-acute disease and occurs most commonly in the autumn coinciding with the folding of hoggs on rape, turnips and improved pastures. The factors which predispose sheep to the different forms of the disease are poorly understood but recently it has been possible to reproduce pasteurella pneumonia experimentally.  相似文献   

Isotopic compositions of cometary matter returned by Stardust     

McKeegan KD  Aléon J  Bradley J  Brownlee D  Busemann H  Butterworth A  Chaussidon M  Fallon S  Floss C  Gilmour J  Gounelle M  Graham G  Guan Y  Heck PR  Hoppe P  Hutcheon ID  Huth J  Ishii H  Ito M  Jacobsen SB  Kearsley A  Leshin LA  Liu MC  Lyon I  Marhas K  Marty B  Matrajt G  Meibom A  Messenger S  Mostefaoui S  Mukhopadhyay S  Nakamura-Messenger K  Nittler L  Palma R  Pepin RO  Papanastassiou DA  Robert F  Schlutter D  Snead CJ  Stadermann FJ  Stroud R  Tsou P  Westphal A  Young ED  Ziegler K  Zimmermann L  Zinner E 《Science (New York, N.Y.)》2006,314(5806):1724-1728

Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild 2 particle fragments; however, extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials. Nonterrestrial nitrogen and neon isotope ratios suggest that indigenous organic matter and highly volatile materials were successfully collected. Except for a single (17)O-enriched circumstellar stardust grain, silicate and oxide minerals have oxygen isotopic compositions consistent with solar system origin. One refractory grain is (16)O-enriched, like refractory inclusions in meteorites, suggesting that Wild 2 contains material formed at high temperature in the inner solar system and transported to the Kuiper belt before comet accretion.  相似文献   

Metaphylactic use of long-acting oxytetracycline in pasteurellosis in lambs     

N J Gilmour  M Quirie  G E Jones  J S Gilmour 《The Veterinary record》1988,123(17):443-444

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Experimental immunisation of lambs against pneumonic pasteurellosis   总被引：1，自引：0，他引：1  

N J Gilmour  W B Martin  J M Sharp  D A Thompson  P W Wells  W Donachie 《Research in veterinary science》1983,35(1):80-86

Methods of immunising lambs against pneumonic pasteurellosis, caused by several serotypes of Pasteurella haemolytica, were assessed in specific pathogen free lambs. Lambs were vaccinated intramuscularly with sodium salicylate extract (SSE) of P haemolytica, either alone or in combination with heat-killed organisms (HKO). SSE of P haemolytica type A1 protected vaccinated lambs against pneumonia resulting from challenge with the homologous serotype. SSE of type A2 also provided some protection but this was improved by vaccination with a combination of SSE and HKO.  相似文献