The effect of PPF and DIF on plantlet growth of potato in vitro under photoautotrophic condition was investigated.

研究了光通量和昼夜温差对自养培养马铃薯试管苗生长的影响。

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AIM: To investigate the stereoselective metabolism of propafenone (PPF) by human liver CYP3A4.

目的：研究普罗帕酮(PPF)经人肝cyp3a 4代谢的立体选择性。

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A complete process of iron and phosphate releasing from the PPF is observed using electron spectra technique.

选用电子光谱技术研究P PF释放铁和磷酸盐全过程，发现PPF以两种不同速率途径释放铁与磷酸盐。

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If there were no credit markets, everyone would have to be on the production possibility frontier; there would be no other choice.

如果没有信贷市场,每个人的收入水平都会落在PPF曲线上,别无选择

耶鲁公开课 - 金融市场课程节选

Irving Fisher also drew on the curve a production possibility frontier for society, which he made downward-curved.

欧文·费雪还画了一条曲线,代表了社会的生产可能性边界PPF,这是一条向下的曲线

耶鲁公开课 - 金融市场课程节选

But if we have credit markets, then people can individually choose to be off the production possibility frontier and at a higher level of consumption than otherwise would.

但如果存在信贷市场,那么个人可以选择超越,PPF曲线的范围,达到比没有信贷市场时更高的消费水平

耶鲁公开课 - 金融市场课程节选

"Over the year to July 2010, the FTSE All-Share index rose by 15.4%, " the PPF said.

BBC: Pension changes 'are a nightmare', experts warn

Director PPF Samina Ishaque in her opening remarks explained the goals of the programme.

UNESCO: Communication and Information

One in four people say the PPF will help increase their trust in pensions, according to ABI research.

BBC: Analysis