Leukocyte counts in the blood from the tail and the heart of the mouse     

GOLDIE H  JONES AM  RYAN H  SIMPSON M 《Science (New York, N.Y.)》1954,119(3089):353-354

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Growth and carbon economy of nodulated white clover in the presence and absence of combined nitrogen     

A. HAYSTEAD  J. KING  W. I. C. LAMB  C. MARRIOTT 《Grass and Forage Science》1980,35(2):123-128

An investigation of the carbon economy of single S184 white clover plants nodulated with an effective strain of Rhizobium trifolii growing on N-free nutrient solution and supplied with 150 parts/10⁶ N as NH₄NO₃ has shown that 10% more of the C fixed per day is available for growth in the plants supplied with combined N. The difference between the two groups of plants is a result of higher respiratory activity in the roots of plants growing exclusively on N₂. In terms of shoot growth, however, the difference in growth rate is likely to be less than 10%, because the rate of root growth is greater in the plants supplied with a moderate level of combined N. There is no evidence that NO^-₃ and CO₂ compete for photosynthetically produced reductant in the leaves of plants grown on N₂+NH₄NO₃, since no reduction in net photosynthesis was observed in plants assimilating combined N. An experiment carried out on detached leaflets of white clover grown on N₂ and on N₂+ NH₄NO₃ has shown that NO^-₃ -reducing activity is present in the leaflets of plants grown on N₂+ NH₄NO₃ but not in plants grown on N₂ and that the activity is light-dependent. Measurements of ¹⁴CO₂ respired in the light and dark by leaflets previously allowed to photosynthesize ¹⁴CO₂ showed that the ratio of ¹⁴CO₂ output in the light to ¹⁴CO₂ output in the dark was no higher in plants grown on N₂+ NH₄NO₃ than in plants grown on N₂. This observation is consistent with the finding that N source does not affect net photosynthesis in whole plants.  相似文献   

Regrowth of ryegrass swards subject to different cutting regimes and stocking densities     

J. KING  W. I. C. LAMB  M. T. McGregor   《Grass and Forage Science》1979,34(2):107-118

A cutting experiment was carried out on a sward of S23 perennial ryegrass to study the effect of different defoliation regimes on regrowth and the factors affecting regrowth. The defoliation frequencies and intensities encompassed the range commonly found on continuously stocked pastures. The defoliation regimes produced swards of contrasting growth form with regrowth characteristics which differed in respect of senescence loss, fall in water-soluble carbohydrate concentration, residual leaf area index, photosynthesis per unit leaf area index and photosynthesis per unit area of land. Regrowth was most closely related to the latter. These results were used to interpret data for net canopy photosynthesis of continuously grazed pastures.  相似文献   

Factors affecting development of Septoria tritici in winter wheat and its effect on yield     

M. R. THOMAS  R. J. COOK  J. E KING 《Plant pathology》1989,38(2):246-257

Severe infection with Septoria tritici occurred in four of five experiments designed to create a series of different disease epidemics. These experiments successfully identified periods suitable for infection. They also indicated the effect of sprays, timed before and after these periods, on disease development and yield.
Analysis of disease progress and weather records suggested that critical conditions for initial development of S. tritici occurred during early May at four sites. Heavy rain giving at least 10 mm on 1 day or a total of 10 mm or more on 2 or 3 successive days occurred at all four sites prior to the appearance of symptoms on a particular leaf layer, though less heavy rain may suffice to splash inoculum onto upper leaves in shorter, immature canopies where stem elongation is incomplete. At the fifth site, infection occurred later in May and disease failed to develop to a significant degree. At all sites, the length of the incubation period on any of the top three leaves was found to be between 396 and 496 degree days.
Control of winter epidemics of S. tritici had little effect on yield, whereas spray sequences commencing later than growth stage (GS) 31 but immediately prior to the critical periods provided the best disease control and yield benefit. Regression models incorporating, as independent variables, area under the S. tritici disease progress curve for any of the top three leaves from their emergence (GS 32-37) satisfactorily explained yield loss at the four sites where disease was severe. Consideration of leaf 2 or leaf 3 alone accounted for more than 82% of the variance at each site and a yield loss from infection of leaf 2 related to thermal time is suggested as 0.00265% per C per day from the appearance of symptoms.  相似文献   

First record of Tapesia yallundae as the teleomorph of Pseudocercosporella herpotrichoides var. acuformis, and its occurrence in the field in the Federal Republic of Germany     

AMBER C. KING 《Plant pathology》1990,39(1):44-49

Tapesia yallundae is reported for the first time in the Federal Republic of Germany. Apothecia were found on wheat and rye stubble at two sites in the north of the country and one in the centre, in April 1988. Isolates of Pseudocercosporella herpotrichoides var. acuformis were obtained from germinating single ascospores, identified on the basis of colony morphology, mode of conidial production and pathogenicity to wheat and rye.  相似文献   

Relationship between Yield Loss and Severity of Yellow Rust Recorded on a Large Number of Single Stems of Winter Wheat   总被引：4，自引：4，他引：0  

J. E. KING 《Plant pathology》1976,25(4):172-177

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Observations of apothecia of Tapesia yallundae and the cultural phenotypes of their progeny   总被引：1，自引：1，他引：0  

A. C. KING 《Plant pathology》1991,40(3):367-373

Apothecia of Tapesia yallundae, the perfect state of Pseudocercosporella herpotrichoides, were found in March 1989 on wheat and barley stubble at nine of 37 naturally infested sites and also at one inoculated site in Germany. Apothecia were found on about 1% of stems collected from the naturally infested sites and 5% of stems from the inoculated site, and were first found in the second week of March, coinciding with the onset of an early spring. Apothecia were not found on either green plants or second-year stubble. In total, 143 single-spore isolates were obtained from the apothecia and described according to a range of morphological characteristics. The majority were ascribed to P. herpotrichoides var. herpotrichoides. This is the first isolation of this variety from T. yallundae apothecia in Germany. Even single-conidial isolates from one apothecium showed much variation, some being like var. herpotrichoides, some like var. acuformis and some intermediate.  相似文献   

The prevalence of leptospirosis in cattle herds of the Western Division of New South Wales—a serological survey     

S. KING 《Australian veterinary journal》1991,68(9):307-308

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Pharmacokinetics and bioequivalence of parenterally administered doramectin in cattle   总被引：3，自引：1，他引：2  

M.A. NOWAKOWSKI  M.J. LYNCH  D.G. SMITH  N.B. LOGAN†  D.E. MOUZIN†  J. LUKASZEWICZ  N.I. RYAN  R.P. HUNTER  R.M. JONES 《Journal of veterinary pharmacology and therapeutics》1995,18(4):290-298

Plasma concentrations of doramectin in 40 cattle dosed by subcutaneous (sc) or intramuscular (i.m.) injection (200 μg/kg) were compared to assess the bioequivalence of the two routes of administration. Peak concentration ( C _max), and areas under the concentration curve ( AUC_0– ) were determined from plasma concentrations. Animals treated by the sc route showed a mean AUC_0– of 457 ± 66 ng±day/mL (± SD) and a mean C _max of 27.8 ± 7.9 ng/mL. Results from the i.m. treatment group showed a mean AUC _0– of 475 ± 82 ng-day/mL and a mean C _max of 33.1 ± 9.0 ng/mL Absorption constants ( k _a) determined by modelling were 0.542 ± 0.336 day^-1after sc administration and 0.710 ± 0.357 day^-1after i.m. administration. The 90% confidence limits on the difference between mean AUC _0– values for the sc and i.m. groups fell within 20% of the mean value for the subcutaneous group. C _max was somewhat greater for the i.m. route. The 90% confidence limits on the difference in mean In ( T _max+1) also fell within 20% of the mean sc value. Based on this analysis, bioequivalence of the sc and i.m. formulation has been established.  相似文献   

Production of pharyngoconjunctival fever in human volunteers inoculated with APC viruses     

WARD TG  HUEBNER RJ  ROWE WP  RYAN RW  BELL JA 《Science (New York, N.Y.)》1955,122(3179):1086-1087

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