Clonal Propagation and Assessment of Biomass Production and Saponin Content of Elite Accessions of Wild Paris polyphylla var. yunnanensis.

Paris polyphylla var. yunnanensis is an endangered medicinal plant endemic to China with great economic importance for the pharmaceutical industry. Two significant barriers to its commercial development are the long duration of its seed germination and the frequency of interspecific hybridization. We developed a method for clonal propagation of Paris polyphylla var. yunnanensis and successfully applied it to selected elite wild plants, which could become cultivar candidates based on their biomass production and saponin content. In comparison to the traditional method, somatic embryogenesis produced an average of 63 somatic embryos per gram of callus in just six weeks, saving 12 to 15 months in plantlet production. The produced in vitro plantlets were strong and healthy and 94% survived transplanting to soil. Using this method, four candidate cultivars with diverse morphologies and geographic origins were clonally reproduced from selected elite wild accessions. In comparison to those obtained with the traditional P. polyphylla propagation technique, they accumulated higher biomass and polyphyllin levels in rhizomes plus adventitious roots during a five-year period. In conclusion, somatic embryogenesis-based methods offer an alternate approach for the rapid and scaled-up production of P. polyphylla, as well as opening up species conservation options.

Bioconjugated nanoparticles for attachment and penetration into pathogenic bacteria.

As an antimicrobial agent, silver nanoparticles functionalized with both bacitracin A and polymyxin E (AgNPs-BA&PE) were designed and synthesized with complementary antibacterial functions to act against gram-positive and gram-negative bacteria. AgNPs-BA&PE could easily get attached and penetrate into the bacterial cell membrane through surface-immobilized BA and PE with a membrane target, resulting in up to 10-fold increase in the antibacterial activity, without the emergence of bacterial resistance. Analysis of the antimicrobial mechanism confirmed that the synthesized nanoparticles caused disorganization of the bacterial cytomembrane and leakage of cytoplasmic contents. This antimicrobial agent with better biocompatibility can promote healing of infected wounds, and has promising and useful applications in biomedical devices and antibacterial control systems.

Stir-fried white pepper can treat diarrhea in infants and children efficiently: a randomized controlled trial.

We evaluated the efficacy and safety of stir-fried white pepper in the treatment of infant and children diarrhea. This was a randomized trial conducted in the pediatric emergency department of the hospital affiliated to Jining Medical College. One hundred seventy four patients were selected from outpatients from 2011 to 2012. Participants were randomly assigned to treatment with stir-fried white pepper (n = 88) or montmorillonite powder (n = 86). The proportions of chronic diarrhea patients (n = 52) showing success of treatment were similar for both groups. There were great differences between the two groups in acute diarrhea (n = 62) and persistent diarrhea (n = 60), and the cure rate of stir-fried white pepper was higher than montmorillonite powder in both groups. The prescription of stir-fried white pepper significantly decreased the frequency of diarrhea in infants and children under 2.5 years with diarrhea compared to treatment with montmorillonite powder, especially for the patients with acute diarrhea or persistent diarrhea.