BEIJING, March 22 (Xinhua) — The following is a summary of published science and technology news of China.

UVC LIGHT BOOSTS SWEET CHERRIES NUTRITION

Chinese researchers have found how ultraviolet C (UVC) light treatment can boost the nutritional value of sweet cherries.

UVC radiation, present in sunlight, has a shorter wavelength than ultraviolet A or B light. The radiation is completely absorbed by the ozone layer and Earth’s atmosphere.

COVID-19 ANTIBODIES

About 40 percent of COVID-19 positive patients in Wuhan, capital of central China’s Hubei Province, have antibodies that can offer protection against being reinfected with the virus for at least nine months.

According to the study, the adjusted COVID-19 positive rate in the city hardest hit by the virus earlier last year was just 6.9 percent, indicating that only a small proportion of the city population was infected after the epidemic outbreak.

BIOMARKERS FOR RHEUMATOID ARTHRITIS

Chinese researchers have identified new biomarkers for rheumatoid arthritis, which can facilitate the early diagnosis and treatment of the disease.

The commonly used clinical diagnostic marker for rheumatoid arthritis is anti-citrullinated protein antibody (ACPA), but about one-third of the patients are ACPA-negative. As a result, many patients cannot receive timely diagnosis and treatment, which affects their quality of life and prognosis.