Sodium deficiency in lucerne (Medicago sativa) forage in southern Australia and the effect of sodium and barley supplementation on the growth rate of lambs grazing lucerne

2020 ◽  
Author(s):  
M. R. Champness ◽  
J. I. McCormick ◽  
M. S. Bhanugopan ◽  
S. R. McGrath
Keyword(s):  
Growth Rate ◽  
Medicago Sativa ◽  
Sodium Deficiency

scholarly journals Biological activity of saponins from alfalfa tops and roots against Colorado potato beetle larvae

2013 ◽  
Vol 54 (2) ◽  
pp. 35-45 ◽  
Author(s):  
Maryla Szczepaniak ◽  
Katarzyna Krystkowiak ◽  
Marian Jurzysta ◽  
Zbigniew Biały
Keyword(s):  
Growth Rate ◽  
Biological Activity ◽  
Medicago Sativa ◽  
Colorado Potato Beetle ◽  
Larval Stage ◽  
Aerial Parts ◽  
Potato Beetle

The total saponins of alfalfa, <i>Medicago sativa</i> L., included in the diet of Colorado potato beetle larvae reduced their feeding, growth rate and survival. The biological activity of those compounds coming both from the roots and from the aerial parts is closely correlated with the dose. Larvae reared on leaves treated with a 0,5% dose virtually did not feed at all and died after 4-6 days. Lower saponin doses (0,01 and 0,001 %) reduced the insects' feeding to a lesser degree. However, they inhibited their growth, caused an extension of the larval stage and mortality at a level of 76,7- 100%. No major differences have been found in saponin activity depending on its localization in the plant.

Effects of salt on the growth and timing of reproduction of the deer mouse (Peromyscus maniculatus borealis)

1997 ◽  
Vol 75 (1) ◽  
pp. 110-115 ◽  
Author(s):  
Bonnie E. Woolfenden ◽  
John S. Millar
Keyword(s):  
Growth Rate ◽  
Peromyscus Maniculatus ◽  
Deer Mouse ◽  
Food Control ◽  
Sodium Deficiency ◽  
Timing Of Reproduction ◽  
Treatment Groups ◽  
Young Of The Year ◽  
Delayed Maturation ◽  
Preweaning Period

The effects of salt on the growth and timing of reproduction in Peromyscus maniculatus borealis were investigated in the laboratory, as well as in the Kananaskis Valley, Alberta, Canada, to test the hypothesis that sodium limitation results in delayed maturation of young animals. Laboratory-born juveniles were assigned to treatment groups in which the mother received nutritionally complete food (control) or sodium-deficient food during the preweaning period. Growth of male nestlings was not affected by sodium deficiency, but among female nestlings, growth was slower in sodium-deficient groups than in controls. Juveniles were also assigned to one of two postweaning diet groups at weaning, resulting in four treatment groups based on the diet received during the pre- and post-weaning periods. For both sexes, the overall growth rate was higher in animals given nutritionally complete food in both the pre- and post-weaning period than in animals given sodium-deficient food during the postweaning period. Salt supplementation in the field resulted in the birth of significantly more litters to overwintered females than to nonsupplemented controls, but not did not result in a greater number of young weaned from each litter. Salt supplementation did not affect initiation of breeding or length of the breeding season for overwintered females, and did not affect overall growth rates or initiation of reproduction in young-of-the-year mice. Mice appear to obtain sufficient salt from their natural diets.

The threshold energy for atom displacement in fcc metals

1990 ◽  
Vol 48 (4) ◽  
pp. 530-531
Author(s):  
Wilfried Sigle ◽  
Matthias Hohenstein ◽  
Alfred Seeger
Keyword(s):  
Growth Rate ◽  
Elevated Temperatures ◽  
Threshold Energy ◽  
Dislocation Loops ◽  
Absolute Minimum ◽  
Voltage Electron ◽  
Atom Displacement ◽  
Electron Microscopes ◽  
Fcc Metal

Prolonged electron irradiation of metals at elevated temperatures usually leads to the formation of large interstitial-type dislocation loops. The growth rate of the loops is proportional to the total cross-section for atom displacement,which is implicitly connected with the threshold energy for atom displacement, Ed . Thus, by measuring the growth rate as a function of the electron energy and the orientation of the specimen with respect to the electron beam, the anisotropy of Ed can be determined rather precisely. We have performed such experiments in situ in high-voltage electron microscopes on Ag and Au at 473K as a function of the orientation and on Au as a function of temperature at several fixed orientations.Whereas in Ag minima of Ed are found close to <100>,<110>, and <210> (13-18eV), (Fig.1) atom displacement in Au requires least energy along <100>(15-19eV) (Fig.2). Au is thus the first fcc metal in which the absolute minimum of the threshold energy has been established not to lie in or close to the <110> direction.

Characterization of embryogenesis-related proteins in alfalfa (Medicago sativa)

1996 ◽  
Vol 96 (4) ◽  
pp. 585-592 ◽  
Author(s):  
Randal W. Giroux ◽  
K. Peter Pauls
Keyword(s):  
Medicago Sativa ◽  
Related Proteins

Effects of estrone and 17beta-estradiol on vegetative growth of Medicago sativa

1992 ◽  
Vol 84 (2) ◽  
pp. 217-222 ◽  
Author(s):  
Laurence S. Shore ◽  
Yoram Kapulnik ◽  
Bruria Ben-Dor ◽  
Yechezkial Fridman ◽  
Smadar Wininger ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Vegetative Growth

Saturation mechanism and generated viscosity in gravito-turbulent accretion disks

2020 ◽  
Vol 640 ◽  
pp. A53
Author(s):  
L. Löhnert ◽  
S. Krätschmer ◽  
A. G. Peeters
Keyword(s):  
Growth Rate ◽  
Numerical Simulations ◽  
Accretion Disks ◽  
Gravitational Instability ◽  
Turbulent Viscosity ◽  
Radial Distance ◽  
Maximum Growth ◽  
Wave Number ◽  
Radiative Cooling ◽  
Mixing Length

Here, we address the turbulent dynamics of the gravitational instability in accretion disks, retaining both radiative cooling and irradiation. Due to radiative cooling, the disk is unstable for all values of the Toomre parameter, and an accurate estimate of the maximum growth rate is derived analytically. A detailed study of the turbulent spectra shows a rapid decay with an azimuthal wave number stronger than ky−3, whereas the spectrum is more broad in the radial direction and shows a scaling in the range kx−3 to kx−2. The radial component of the radial velocity profile consists of a superposition of shocks of different heights, and is similar to that found in Burgers’ turbulence. Assuming saturation occurs through nonlinear wave steepening leading to shock formation, we developed a mixing-length model in which the typical length scale is related to the average radial distance between shocks. Furthermore, since the numerical simulations show that linear drive is necessary in order to sustain turbulence, we used the growth rate of the most unstable mode to estimate the typical timescale. The mixing-length model that was obtained agrees well with numerical simulations. The model gives an analytic expression for the turbulent viscosity as a function of the Toomre parameter and cooling time. It predicts that relevant values of α = 10−3 can be obtained in disks that have a Toomre parameter as high as Q ≈ 10.

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