Biomedical subjects

Haifeng Qian

Publications and source records attributed to Haifeng Qian.

3 recordsLinked to original sources

PubMed2007

Effects of validamycin on some enzymatic activities in soil.

There have been few investigations of the possible effects of validamycin on the enzymatic activities in soil. The objective of this present work was to study the short-term influence of enzymatic activity in validamycin treated soils. The results showed that high dose of validamycin introduced into soil had an significant effect on soil enzymatic activities, the degree of inhibition or promotion of enzymatic activities was not only related to the concentration of validamycin, but also to the remain time. Compared with the control (non treatment with validamycin), 240 ml.mg(-1) validamycin treatment caused a significant decrease (14%) of soil catalase activity; validamycin also inhibited urease activity to 67.3%, but subsequently, validamycin stimulated its activity higher than that of the control. Only the highest dose stimulated acid phophatase activities by 29.7%, and other concentration treatments had no effects on these enzymatic activities. The above results indicated that validamycin had effects on soil enzyme, but the effective time was short. It is also interesting to speculate that validamycin can be easily used by the soil microorganism as carbon source and energy.

Acid Phosphatase↗

PubMed2006

[The features of four types of operation for treating chronic hypertrophy rhinitis and ultrastructure observation of the inferior turbinate mucosa].

OBJECTIVE: To assess the features of four types of operation for treating chronic hypertrophy rhinitis and to observe the ultrastructure of inferior turbinate mucosa. METHOD: Eighty-eight cases of chronic hypertrophic rhinitis (HR) were treated by transnasal endoscopic submucous inferior turbinate resection (group A), thirty cases of HR were treated by partial inferior turbinectomy (group B), thirty six cases of HR were treated by bipolar radiofrequency ablation on inferior turbinate (group C), ten cases of HR were treated by injection of sclerosing agent (group D). The efficacy in the three groups (A,B,C) and the features of four types operation were compared and the ultrastructure of inferior turbinate was observed both preoperatively and postoperatively. RESULT: Four groups of HR were followed up 4 months to half year after operation, effective rate was 97.4 (group A) 100% (group B) and 93.4% (group C) respectively, while group A, group B and group C effective rate had no significant difference among them. Group A and group C have more advantages compared to the other 2 groups for they remained good ultrastructure of inferior turbinate mucosal cilia after 4 to 6 months postoperatively. CONCLUSIONS: The use of transnasal endoscopic submucous inferior turbinate resection and bipolar radiofrequency ablation for treatment of chronic hypertrophy rhinitis are effective modality for the treatment of chronic hypertrophy rhinitis.

Adolescent↗

PubMed2003

A phone-assistive device based on Bluetooth technology for cochlear implant users.

Hearing-impaired people, and particularly hearing-aid and cochlear-implant users, often have difficulty communicating over the telephone. The intelligibility of telephone speech is considerably lower than the intelligibility of face-to-face speech. This is partly because of lack of visual cues, limited telephone bandwidth, and background noise. In addition, cellphones may cause interference with the hearing aid or cochlear implant. To address these problems that hearing-impaired people experience with telephones, this paper proposes a wireless phone adapter that can be used to route the audio signal directly to the hearing aid or cochlear implant processor. This adapter is based on Bluetooth technology. The favorable features of this new wireless technology make the adapter superior to traditional assistive listening devices. A hardware prototype was built and software programs were written to implement the headset profile in the Bluetooth specification. Three cochlear implant users were tested with the proposed phone-adapter and reported good speech quality.

Cochlear Implants↗