Randomness and discreteness for appearance of pop-out of the single crystal silicon with a (100) orientation were studied by a self-made indentation device. For a given maximum penetration load, the load Ppo for appearance of pop-out fluctuates in a relatively large range, which makes it hard to study the effect of the loading/unloading rate on the load Ppo. Experimental results with different ...

In Arkansas, resistance to protoporphyrinogen IX oxidase (PPO)-inhibiting herbicides in Amaranthus palmeri S. Wats. is mainly due target site mutations. Although A. PPO-mutations are well investigated, the cross-resistance that each ppo mutant endows weed populations not yet understood. We aimed evaluate response of PPO-resistant accessions, harboring ppo2 mutations ?G210 and G399A, multiple PP...

The antioxidant potential of eight clingstone peach cultivars was investigated by determining phenolic compounds and inhibition of low-density lipoprotein (LDL) oxidation. Cultivars low in polyphenol oxidase (PPO) were also selected to minimize enzymatic browning. Inhibition of LDL oxidation varied from 17.0 to 37.1% in peach flesh extract, from 15.2 to 49.8% in whole peach extract, and from 18...

The production of gamma interferon (IFN-y) by peripheral blood lymphocytes was studied in 38 patients with gastric cancer. Purified protein derivative (PPO) as a specific antigen and three kinds of mitogens, phytohemagglutinin-P (PHA), concanavalin A(Con A) and pokeweed mitogen (PWMl, were used as IFN-y inducers. IFN-y production by lymphocytes was markedly reduced in patients with gastric canc...

The structural dynamics of a polymer electrolyte model material, poly~prolyene oxide! (PPO) – LiClO4 ~and PPO for reference!, has for the first time been studied using coherent quasielastic neutron scattering. By a combination of neutron spin echo and inverse time-of-flight techniques we investigate the relaxation function in an experimental time window 10&t &10 s at a momentum transfer corresp...

The expression of three polyphenol oxidase (PPO; EC 1.10.3.1) genes was investigated in hybrid poplar (Populus trichocarpa · P. deltoides). PtdPPO1 was previously isolated as a woundand herbivore-inducible PPO (Constabel et al. Plant Physiol 124: 285–295, 2000), whereas PtdPPO2 and PtdPPO3 are two novel hybrid poplar PPO genes isolated from stem and root tissue, respectively. Sequence analysis ...

The Product-Process-Organisation model, PPO, provides efficient assistance to collaboration during innovative design project. This model is dedicated to the development phase of a new product: the product architecture is indeed not yet defined and tasks will be set dynamically during the product development. In an integrated design perspective, development must also forecast each product behavi...

Polyphenol oxidase (PPO) activity was investigated during rooting in cuttings from three different grape cultivars (Vitis vinifera L. cvs. Muscat, Cardinal and Perlelte), and the enzyme activity and rooting ability were compared. Rooting was observed on the Muscat and Perlelte cuttings, but not on the Cardinal cuttings. PPO activity started to increase in the early stage of the experiment, and ...

The effect of different anti-browning agents on partially purified longan polyphenol oxidase (PPO) activity was investigated by spectrophotometry, using catechol as a phenolic substrate. For this purpose, L-cysteine, potassium metabisulfite, ascorbic acid, and citric acid were used to inhibit the activity of longan PPO at different concentrations (0-10 mM). Lcysteine was found to be the most po...