The effect of gibberellic acid on fruit and seed set in crosses of garden and winter hardy Rosa accessions     

Ian Ogilvie  Daniel Cloutier  Neville Arnold  Perry Y. Jui 《Euphytica》1991,52(2):119-123

Summary The effect of gibberellic acid (GA₃) was studied on a wide range of crosses between various garden roses and two hardy breeding lines. Although there were fewer seeds per fruit, fruit set was higher in most crosses when GA₃ was applied to the stigma at the rate of 250 ppm ten days after pollination. However, higher fruit set did not result in more seeds per pollination for many crosses and seemed to be related to the degree of male parentage. Both parents used had a major effect on pollination success. Recently developed Rosa cultivars have a narrow genetic base and the use of distantly related cultivars as parents would possibly give a high seed set and greater numbers of progeny.Contribution No. 335/90.08.01R, Experimental Farm, L'Assomption; Contribution No. Ro 44, Research Program Service, Ottawa.  相似文献   

Growth‐Oriented Small Firms and the Nature and Extent of Local Embeddedness: The Case of a Traditional Metalworking Cluster     

Andrew M. Wood  H. Doug Watts  Perry Wardle 《Growth and change》2004,35(4):419-433

ABSTRACT Clusters now form a central element in many regional economic development policies. Location within a cluster of related industries is thought to increase a firm's competitive advantage resulting in higher output and productivity growth rates than in similar firms located beyond the cluster. This study focuses on owner‐managers operating small firms within a traditional cluster of metalworking industries and empirically examines the relationship between growth‐orientation and the extent and nature of cluster embeddedness. The results indicate only a limited number of differences in growth‐orientation given variations in levels of cluster embeddedness. Contrary to conventional wisdom, many of the most growth‐oriented entrepreneurs focus their activities outside the cluster, especially in terms of market‐based linkages. However, those firms with more advanced process technologies do tend to show above average within cluster linkages.  相似文献   

Azithromycin concentration in severely inflamed canine external ear canals – a case series     

E. Perry  E. Lavy  S. Soback  M. Britzi  G. Zur 《The Journal of small animal practice》2020,61(7):416-418

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Sarcocystis myositis and vitamin E deficiency in a Gypsy Vanner stallion suspected of having equine motor neuron disease     

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   

Morphological responses of the rainbow trout (Oncorhynchus mykiss) gill to hyperoxia,base (NaHCO3) and acid (HCl) infusions     

Greg G. Goss  Chris M. Wood  Pierre Laurent  Steve F. Perry 《Fish physiology and biochemistry》1994,12(6):465-477

Marked morphological responses occur in the gills of freshwater rainbow trout in response to experimental acid-base disturbance and these responses play an important role in acid-base correction. Compensated respiratory acidosis induced by 70h exposure to environmental hyperoxia (elevated water PO₂) caused a 33% decrease in branchial chloride cell fractional surface area (CCFA). Metabolic alkalosis induced by normoxic recovery (6h) from hyperoxia (72h) caused a 50% increase in CCFA, whereas metabolic alkalosis induced by infusion (19h) of NaHCO₃ caused a 70% rise. However, the largest increase (135%) in CCFA was seen in response to infusion (19h) of HCl. NaCl infusion had no effect. A particular goal was to assess the relative importance of changes in CCFA vs. changes in internal substrate (HCO₃ ^–) availability in regulating the activity of the branchial Cl^–/HCO₃ ^– exchange system. For each of the experimental treatments, the accompanying blood acid-base status and branchial transport kinetics (K_m, J_max) for Cl^– uptake had been determined in earlier studies. In the present study, a positive linear relationship was established between CCFA and J^Cl– _max in individual control fish in the absence of an acid-base disturbance. By reference to this relationship, observed changes in J^Cl– _max during metabolic acid-base disturbances were clearly due to changes in both CCFA and internal substrate levels (plasma [HCO₃ ^–]) with the two factors having approximately equal influence.  相似文献   

Fire history and understorey vegetation: Water and nutrient relations of Eucalyptus gomphocephala and E. delegatensis overstorey trees     

Dugald C. Close  Neil J. Davidson  Perry W. Swanborough 《Forest Ecology and Management》2011,262(2):208-214

Fire regimes in temperate forests and woodlands have changed significantly in Australia since European settlement. We hypothesised that an absence of fire leads to the increased development of woody understorey/midstorey and that this may be correlated with decreased water and/or nutrient availability in overstorey temperate eucalypts currently declining in health. Sites with a history of being long unburnt or recently (and frequently in the case of Eucalyptus gomphocephala woodland) burnt (relative to median fire intervals for the vegetation type) were established in E. gomphocephala woodland in Western Australia and in Eucalyptus delegatensis forest in Tasmania. In long unburnt sites in both E. gomphocephala woodland and E. delegatensis forest, there was greater percent cover of understorey/midstorey and eucalypts had higher water use efficiency, indicative of greater soil water limitation, as estimated by foliar carbon isotope ratios. In E. gomphocephala woodland foliar Cu and Zn were significantly lower in eucalypts of long unburnt, relative to frequently burnt, sites. In E. gomphocephala woodland, understorey/midstorey (shrub) cover was positively correlated, and foliar copper and zinc levels were negatively correlated to health of overstorey trees. In E. delegatensis forest foliar phosphorus (P) was significantly lower in eucalypts of long unburnt, relative to recently burnt, sites. In E. delegatensis forest moss cover was positively correlated and foliar P was negatively correlated to health of overstorey trees. The understorey/midstorey that develops in the long absence of fire may alter ecological processes that lead to less favourable water- and nutrient-relations in E. gomphocephala woodland and E. delegatensis forest that are associated with decline in crown health. However this study does not definitively show a link between understorey/midstorey vegetation and overstorey tree water- and nutrient-relations. This link will be investigated in future research.  相似文献   

The impact of a workplace catering initiative on dietary intakes of salt and other nutrients: a pilot study     

Geaney F  Harrington J  Fitzgerald A  Perry I 《Public health nutrition》2011,14(8):1345-1349

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Comparative autoradiographic study of parasite-host-cell cyclical relationship in lymphoblastoid cell lines infected with Theileria annulata and Theileria parva in vitro     

W G Jura  C G Brown  M Perry 《Veterinary parasitology》1985,18(4):339-348

Cyclical interactions between intracellular schizonts of the Ankara and Hissar strains of Theileria annulata and the Muguga strain of T. parva and the parasitised host lymphoblasts have been studied autoradiographically by following the incorporation of (3H) thymidine into parasite and host cell nuclei, and also by quantitating the number of schizont nuclei per lymphoblast, at various stages and phases of host cell cycle. The synthesis of DNA by Theileria schizonts and the parasitised host lymphoblasts was found to be asynchronous and to occur at different phases of the host cell interphase stage. While the lymphoblast nuclear DNA incorporates (3H) thymidine during the S phase, schizont nuclei were labelled during the G2 phase of the host lymphoblast interphase stage. The replication of schizont nuclei took place before the metaphase stage of host cell cycle, viz, prometaphase, so that the mean schizont nuclear number at host prometaphase and at anaphase--telophase was consistently more or less double the mean nuclear number at interphase.  相似文献   

Intradermal transmission of Potomac horse fever   总被引：1，自引：0，他引：1  

B D Perry  Y Rikihisa  G K Saunders 《The Veterinary record》1985,116(9):246-247

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Effect of dietary phosphorus and roughage levels on calcium, magnesium and potassium utilization by sheep     

H O Lopes  T W Perry 《Journal of animal science》1986,63(6):1983-1989

Three levels of dietary P (.12%, .24% and .48% of dry matter) and three levels of roughage as ground corn cobs (25% 50% and 75% of dry matter) were fed in a 3 X 3 factorial metabolism trial, utilizing 36 crossbred (Hampshire X Columbia) intact male lambs, 6 to 9 mo of age. All diets contained cane molasses (5%), blood meal (13.5%), urea (1%), corn oil (1%) and salt (.5%). Limestone supplied supplemental Ca and treatment P levels were supplied by monosodium phosphate. Equal levels of corn starch and cerelose supplied the remainder of the diet. The diet was fed ad libitum, once daily. The highest P level (.48% P) resulted in a negative (P less than .01) Ca balance (-.23 g/d vs .12 g/d for .12% P and .31 g/d for .24% P groups), and apparent digestibility (P less than .01) of Ca (1.65% vs 17.18 and 22.2% for the two respective lower P dietary levels). Blood serum concentrations of Ca and Mg decreased (P less than .01) as dietary P level was increased. Apparent digestibility of Mg was decreased (P less than .05) by the highest P level (6.9% vs 21.58% and 18.80% for the two lower levels of dietary P). Level of roughage had no effect on Ca and Mg utilization; however, the highest level (75% corn cobs) resulted in improved (P less than .05) K balance (.85 g/d vs .30 and .50 g/d for the two lower levels of roughage).(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献