[Optimization of enzymatic extraction of polysaccharide from Dendrobium officinale by box-Behnken design and response surface methodology].

Objective: To optimize the processing of enzymatic extraction of polysaccharide from Dendrobium officinale.

Methods: With phenol-sulfuric acid method and the DNS determination polysaccharide, Box-Behnken response surface methodology was used to optimize different enzyme dosage, reaction temperature and reaction time by using Design-Expert 8.05 software for data analysis and processing.

[Study on changes in circulatory renin-angiotensin system in rats with endotoxemia].

Objective: To investigate the changes in circulatory renin-angiotensin system (RAS) in rats with endotoxemia and explore its mechanism.

Methods: Ninety Wistar rats were randomly divided into normal control group (n=10) and endotoxemia groups (n=80). The endotoxemia group was further divided into subgroups of 2, 4, 8, 12, 24, 48, 72 hours and 7 days after injection of lipopolysaccharide (LPS) into the abdominal cavity (each n=10).

[Prospective 2-year clinical study of patients with positive IgG-antibodies after recovering from severe acute respiratory syndrome].

Objective: To investigate the clinical characteristics of patients recovering from severe acute respiratory syndrome (SARS) during 2 years after the infection.

Methods: The antibody of SARS-IgG, T cell subsets, chest CT, and the pulmonary function were observed in patients 1 month, 3 months, 6 months, and 2 years after convalescence from SARS.

Results: In the 20 SARS cases, the level of antibodies was found to descend gradually and slowly during 2 years after convalescence.

Sublexical processing in visual recognition of Chinese characters: evidence from repetition blindness for subcharacter components.

Repetition blindness (RB) refers to the failure to detect the second occurrence of a repeated item in rapid serial visual presentation (RSVP). In two experiments using RSVP, the ability to report two critical characters was found to be impaired when these two characters were identical (Experiment 1) or similar by sharing one repeated component (Experiment 2), as opposed to when they were different characters with no common components. RB for the whole character occurred when the exposure duration was more than 50 ms with one intervening character between the two critical characters (lag=1), whereas RB for subcharacter components was more evident at exposure durations shorter than 50 ms with no intervening character (lag=0).

Role of structure and component in judgments of visual similarity of Chinese characters.

Skilled readers of Chinese participated in sorting and visual search experiments. The sorting results showed that under conditions of conflicting information about structure and component, subjective judgments of the visual similarity among characters were based on the characters' overall configurations (i.e.