The researchers found that for women with
PHBC, age-adjusted core and surgical biopsy rates were doubled after MRI versus mammography (57.1 versus 23.6 per 1,000 episodes).
brasilense strain Sp7, identified as
phbC Sp7, impaired in the production of PHB, were grown in a medium containing 5 and 20 mM N[H.sub.4]Cl, since PHB production has been correlated with carbon availability and nitrogen limitation.
The company has since diversified to include various subsidiary companies, including
PHBC and others.
Soil
pHBC, measured using titration techniques that produce a pH buffer curve, is used in the estimation of acidification risks and acidification rates (Helyar and Porter 1989; Ahern et al.
pMON25948 contains phbA, phbB, and
phbC, each under the control of the CaMV 35S promoter and fused to the Arabidopsis ribulose biphosphate carboxylase (RuBisCo) small subunit la transit peptide, pMON25949 is identical except phbA was replaced with bktB.
The
pHBC was obtained by adding 0, 1, 2, and 4 mL of standardised Ca[(OH).sub.2] with 25, 24, 23, and 21mL of 0.01M Ca[Cl.sub.2], respectively, to 5 g of soil sample.
Acidification (kmol [H.sup.+]/ha) = [DELTA]pH x
pHBC x MR (1)
The addition of all soil amendments significantly increased the
pHBC of the soil (P < 0.001).
For both the methods,
pHBC was calculated as follows:
The mean acidification rates from 1978 to 1992, [DELTA]p[H.sub.Ca], and
pHBC are given in Table 2.
where T is time in years; p[H.sub.i] is the current measured soil pH;
pHBC is mean pH buffering capacity of the soil association (kmol [H.sup.+]/kg.pH); BD is the mean soil bulk density calculated for each soil association using the method of Rawls (1983); V is volume of soil in the 0-15 cm depth interval; and NAAR is net acid addition rate (kmol [H.sup.+]/ha.year), which was assumed to be 2.1 kmol [H.sup.+]/ha.year based on pastures that are stylo-dominant (>80% stylo) (Noble et al.
Likely key influences on the effectiveness of surface-applied lime in increasing the pH below the depth of incorporation include: the quantity of lime applied; the potential for leaching; and the soil texture, which determines the subsurface pH buffer capacity (
pHBC).
