Release date: 2010-09-06 Source: Technology Daily
HÅjicha is a Japanese green tea. It is distinctive from other Japanese green teas because it is roasted in a porcelain pot over charcoal, whereas most Japanese teas are steamed. The tea is fired at a high temperature, altering the leaf color tints from green to reddish brown. The process was first performed in Kyoto, Japan, in the 1920s and its popularity persists today.
Hojicha is often made from bancha ("common tea"),tea from the last harvest of the season; however, other varieties of HÅjicha also exist, including a variety made from sencha, and kukicha, tea made from the twigs of the tea plant rather than the leaves.
HÅjicha infusions have a light- to reddish-brown appearance and are less astringent due to losing catechins during the high-temperature roasting process.The roasted flavors are extracted and dominate this tea: the roasting replaces the vegetative tones of other varieties of Japanese green tea with a toasty, slightly caramel-like flavor. The roasting process used to make HÅjicha also lowers the amount of caffeine in the tea.Because of its mildness, HÅjicha is a popular tea to serve during the evening meal or after, before going to sleep, and even preferred for children and the elderly.
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Researchers at the University of Twente in the Netherlands have developed a biomaterial that can be used in bone grafting to promote bone cell regeneration and healing of damaged bone tissue. Related research was published in the latest issue of the National Academy of Sciences.
At present, due to accidents or bone tumors, large areas of bone defects, bone damage, nonunion, and bone remodeling or reconstruction in plastic surgery, there are two main treatment methods: one is autologous bone transplantation, that is, from The other parts of the patient's body (such as the buttocks) cut the appropriate size of the bone and then implanted into the lesioned bone defect; the second is the bone morphogenetic protein (bmps) method, which uses a bone growth stimulating drug to induce the body to generate new bone. The cells, in order to achieve the purpose of repairing the patient's site.
But both methods are inadequate. Autologous bone grafting is very limited in the number of autologous bones that can be transplanted, and patients undergoing this therapy require at least two surgeries (bone and bone grafting), which not only have a long treatment period, but also have certain risks. Human bone morphogenetic protein is not only extremely expensive, but also has a certain difficulty in accurately positioning in the body. If the protein spreads to an inappropriate position, it will cause bone hyperplasia in healthy parts.
Researchers at the University of Twente in the Netherlands say that the bioceramic materials they developed are made of porous calcium phosphate, which, when implanted in the human body, stimulates surrounding tissues to produce new bone cells, thereby promoting healing of bone tissue in the affected area. . Over time, when the bones of the patient's body completely heal, the biomaterial is completely decomposed and replaced by newly formed bones. The study found that this method is as effective as autologous bone grafting and can completely avoid the limitations of existing therapies.
Researchers have allegedly confirmed that the biomaterial can produce new bone cells in the human body, but it does not understand its specific working mechanism. Researchers believe that stem cells should play a key role in this and will focus on this in the next phase of research.
It is understood that the research of this bioceramic material by Twente University has been going on for nearly 10 years. After the relevant verification and approval, the material is expected to be put into clinical application in recent years.
He developed a new artificial bone graft material