Identification of a Flavanone 2-Hydroxylase Involved in Flavone -Glycoside Biosynthesis from .

Tea contains a variety of flavone -glycosides, which are important compounds that distinguish tea cultivars and tea categories. However, the biosynthesis pathway of flavone -glycosides in tea plant remains unknown, and the key enzymes involved have not been characterized. In this study, a liquid chromatography-mass spectrometry method to determine 9 flavone -glycosides was developed, and the accumulation patterns of 9 flavone -glycosides in tea plants were examined first.

Nontargeted and targeted metabolomics analysis for evaluating the effect of "golden flora" amount on the sensory quality, metabolites, and the alpha-amylase and lipase inhibitory activities of Fu brick tea.

To investigate the effects of "golden flora" amount on the sensory quality, metabolites and bioactivities of Fu brick tea (FBT), FBT samples with different "golden flora" amounts were prepared from the same materials by adjusting the water content before pressing. With the increase of "golden flora" in samples, the tea liquor color changed from yellow to orange red and the astringent taste gradually diminished. Targeted analysis demonstrated that (-)-epigallocatechin gallate, (-)-epicatechin gallate, and most amino acids gradually decreased as the increase of "golden flora".

Isolation and Functional Characterization of Multiple NADPH-Cytochrome P450 Reductase Genes from in View of Catechin Biosynthesis.

Catechins are critical constituents for the sensory quality and health-promoting benefits of tea. Cytochrome P450 monooxygenases are required for catechin biosynthesis and are dependent on NADPH-cytochrome P450 reductases (CPRs) to provide reducing equivalents for their activities. However, CPRs have not been identified in tea, and their relationship to catechin accumulation also remains unknown.

Lentivirus‑mediated microRNA‑26a overexpression in bone mesenchymal stem cells facilitates bone regeneration in bone defects of calvaria in mice.

Repair of bone defects presents a serious clinical challenge as it is difficult to restore bone function and regenerate bone loss. In the present study, the effects of lentivirus‑mediated transfection of bone marrow mesenchymal stem cells (BMSCs) with microRNA (miR)‑26a on bone regeneration were investigated in a mouse bone defect repair model. Marker of proliferation Ki67 (Ki67) staining was employed to detect the cell proliferation capacity and alkaline phosphatase (ALP) staining was used to investigate osteogenic differentiation.

[Oligonucleotide microarray for subtyping avian influenza virus].

Objective: Avian influenza viruses are important human and animal respiratory pathogens and rapid diagnosis of novel emerging avian influenza viruses is vital for effective global influenza surveillance. We developed an oligonucleotide microarray-based method for subtyping all avian influenza virus (16 HA and 9 NA subtypes).

Methods: In total 25 pairs of primers specific for different subtypes and 1 pair of universal primers were carefully designed based on the genomic sequences of influenza A viruses retrieved from GenBank database.

Simultaneously subtyping of all influenza A viruses using DNA microarrays.

Rapid diagnosis of novel emerging subtypes of influenza viruses is vital for effective global influenza surveillance. To this end, a novel microarray based surveillance was developed for subtyping all influenza A viruses on one chip. Using reference strains of different influenza subtypes and samples from different areas, the results show that all the subtypes of the influenza A virus could be identified simultaneously on this microchip with high sensitivity.