White-spot disease of Chinese soft-shelled turtles (Trionyx sinens) caused by Paecilomyces lilacinus

Chinese soft-shelled turtles (Trionyx sinens) in culture farms using an artificial warming system in Zhejiang, China, often show typical signs of white-spot disease such as white spots on their bodies, skin lesions, anorexia and eventually death. The sick turtles were mostly 5~80 g in weight. A suspected fungal pathogen was isolated from the sick turtles and verified as Paecilomyces lilacinus by sequence analysis of the internal transcribed spacer (ITS) of its ribosomal DNA (rDNA). Detailed morphological examinations were also conducted to confirm the white-spot disease.     

Growth mechanism of a preferentially oriented mordenite membrane

INTRODUCTION Zeolite membranes have been investigated formany years due to their promising applications inseparations (Tavolaro and Drioli, 1999) and mem-brane reactors (Coronas and Santamaria, 1999). Oneof the challenges in the preparation of zeolite mem-branes is the control of the crystal orientation, espe-cially for zeolites that have an anisotropic porestructure (Caro et al., 2000). An ideal case is that thechannels in the zeolite crystals are perpendicular tothe support surfa…     

实验教学与创新人才培养

高等学校的实验教学担任培养创新人才的重要任务,实验教学要按照创新人才的基本特征进行有的放矢的改革,要建立一支稳定的、高水平的师资队伍,教学方法倡导学生自主学习,实验内容实施3个结合,充分发挥学生的个性、特长和潜力.     

Studies on characteristics of nanostructure of N-TiO2 thin films and photo-bactericidal action

Pseudomonas aeruginosa strain （AS 1.50） and Bacillus subtilis strain （AS 1.439） from Ming lake were decomposed by photocatalytic nanostructure N-TiO2 thin films in a photo-reactor under UV irradiation. The different thickness nanostructure N-TiO2 thin films coated on mesh grid were prepared by sol-gel method and immobilized at 500 ℃ （films A） or 350 ℃ （films B） for 1 h in a muffle furnace. The results showed that N-TiO2 thin film B （8.18 nm thickness, 2.760 nm height and 25.15 nm diameter） has more uniform granular nanostructure and thinner flat texture than N-TiO2 thin film A （12.17 nm thickness, 3.578 nm height and 27.50 nm diameter）. The bactericidal action of N-TiO2 thin film A and film B for Pseudomonas aeruginosa strain （AS 1.50） and Bacillus subtilis varniger strain （AS1.439） were investigated in this work. More than 95% of photocatalytic bactericidal efficiency for Pseudomonas aeruginosa strain （AS 1.50） and 75% for Bacillus subtilis strain （AS 1.439） were achieved by using N-TiO2 thin films-B for 70-80 rain of irradiation during the photo-bactericidal experimental process. The results indicated that the photo-induced bactericidal efficiency of N-TiO2 thin films probably depended on the characteristics of the films.     

Basal or bolus dose, which is the key factor in CSII？

Objective： To observe the value of HbA1c level evaluating the total daily basal insulin dose by continuous subcutaneous insulin infusion （CSII） in 268 patients with type 2 diabetes mellitus, Methods： 5-point capillary blood glucose was monitored in pre- and post-CSII and the insulin dose which could stabilize blood glucose was defined as the total daily dose of insulin, including basal and bolus total dose. Correlation between HbA1c level and total daily dose of insulin in patients with type 2 diabetes mellitus was analyzed. Correlation between HbA1c level and 5-point capillary blood glucose was also analyzed. Results： Obvious correlation was observed between HbA1c level and the basal total daily dose of insulin if HbA1c was more than 9.3% （r=0.635, P〈0.05）. The average of 5-point capillary blood glucose was best correlated with HbA1c and fasting blood glucose next best. Conclusion： HbA1c level can forecast basal total daily dose of insulin in CSII.     

Supernatant decanting on a centrifugal platform

This study presents a novel approach to decant supernatant on a centrifugal platform. By manipulating the centrifugally induced pressure and the elastic deformation of the plastic lids in the decanting chamber, fixed amounts of the supernatant can be decanted into the detection chamber at lower rotational speeds. The experimental results showed that decanted volume is affected by the volume of deformation and the operating parameters. Factors that influence the decanting ratio are also discussed. This approach has the advantages of simple design and low manufacturing cost; further, it has no need of surface modification. It has been applied to on-disk separation of plasma from whole blood, and the results showed good stability and repeatability.     

Chinese Culture Festival （Guizhou） Celebrated in USA

<正>The Chinese Culture Festival is an annual event initiated in 1999 and organized by local Chinese communities, aimed at showcasing brilliant Chinese culture t...     

Surveillance of viral contamination of invasive medical instruments in dentistry

Objective： To investigate the viral contamination of invasive medical instruments in dentistry and to provide health administrative institutions with surveillance data. Methods： Sterilized samples were randomly collected from the department of dentistry to detect HBV-DNA, HCV-RNA, HIV-RNA and HBsAg. Results： Of the invasive medical instruments that were sterilized with 2% glutaraldehyde, one of the samples was positive for HBV-DNA, and another sample was positive for HBsAg. Conclusion： Though massive virus contamination of invasive medical instruments in dentistry has been reduced to a low level, the occurrence of contamination still remains.