Objective To evaluate the mental health status of train conductors in order to ensure the safety of railway transportation.Methods The mental health status of train conductors was measured using the Chinese version of the SIMH mental health self-evaluating table(SCL-90).Results Compared with the national norm,there was a significant higher mean in nine factors of mental health for the train conductors(t test,P

Objective:To clone mouse CD226(platelet and T cell activation antigen1,PTA1).Methods:Specific primers were designed and sythesized according to the EST sequence from GenBank,which had 51% homology to human CD226 on the amino acid level.And then,the cDNA of mouse CD226 was cloned from the thymus of 4 week old BALB/c mouse by using RACE technique.Results:The length of mouse CD226 cDNA is 2 223 bp,with the open reading frame(ORF) of 1 002 bp,encoding 333 amino acids,which is 3 amino acids shorter than its counterpart in human.The mouse CD226 belongs to IgSF,and shares 53% homology with human PTA1 on amino acid level.Besides,three isoforms of mouse PTA1 were also cloned at the mean time.Conclusion:The molecular cloning of mouse PTA1 lays the foundation for the in vivo studies on the biological function of this molecule,as well as the studies of this molecule in gene knockout mouse and transgenic mouse.

Aim To investigate the effect of intrauterine injection of rat fetal hepatocytes on homograft rejection reaction. Methods The skin graft from a male LOU/CN rat was transplanted to a female recipient CHN rat of 7 to 9 weeks after parturition, and then survival time of the graft was observed. Simultaneously, homograft rejection reaction was examined by mixture lymphocyte culture. Results As compared with control group, survival time of transplanted skin graft was obviously prolonged. Mixure lymphocyte culture demonstrated that homograft rejection reaction was inhibited markedly. Conclusion Intrauterine injection of rat fetal hepatocytes wuld obviously inhibite homograft rejection reaction, thus prolonging survival time of the graft.

Objective:To understand the status of two -week prevalence and the influencing factors in rural preschool leftover children of Shandong , so as to provide evidence for putting forward effective health intervention means .Methods:Using the method of stratified -cluster-random sampling and elect 646 cases of preschool lefto-ver children from 2 counties of Shandong .We surveyed with self -made questionnaire .Results:The two-week prevalence of the rural preschool leftover children is high;the influencing factors of the two -week prevalence with the rural preschool leftover children including whether children are only -child, the type of children guardianship , whether children piddle and whether left -behind children can avoid dangerous .Conclusion: The two -week prevalence present situation of rural preschool left -behind children is low , and its problems of health and ethics are clear.Therefore, effective measures should be carried out to improve the health level of rural leftover children .

Objective:The feasibility of a minimally invasive cosmetic transbilical laparotomy was studied in fifty-seven pediatric patients.The advantages of this technique will be discussed.Methods:The circumferential incision was made following the ring fold of the right umblilicus,which was less than 2700.The peritoneum was opened in the midline via rectus abdominis.Intra-peritoneal lesions were detected and explored.The surgical procedures were able to be carried out either inside or outside of the peritoneum.After closure of peritoneum,the umbilical incision was closed subcutaneously with an absorbable suture.Results:From January 2001 to January 2005,58 procedures via transumbilical route have been done in 57 pediatric patients.None of those cases required conversion to a traditional abdominal incision.The duration of surgery was from 20 to 170 minutes.All patients were discharged five days postoperatively and follow-up was conducted from 3 months to 4 years.No complications were observed in all but one patient.This patient had a leaking anastamosis.No visible scars were present and the cosmetic results were excellent.All patients had shorter hospital stay and lower operating cost.Conclusion:Transumbilical approach is a feasible,safe,economical,minimally invasive procedure with excellent cosmetic results which appears to be superior to traditional procedures.It suggests that the transumbilical route should be widely used clinically and might be applicable for elder children and possibly would be of benefit in the treatment of other conditions.

Objective To analyze the failure and processing methods of helical tomotherapy multileaf collimator (MLC) and summarize relevant maintenance experience,aiming to accurately identify the faulty parts,shorten the downtime and enhance the work time.Methods The failure data of the helical tomotherapy MLC system in the past 48 months were analyzed to identify the common faulty parts,causes and processing methods.Results During the previous 48 months,the MLC failure occurred for 20 times,11 times for air compressor failure,4 times for position verification board failure,twice for leaf driver failure,twice for cushion valve failure and once for the slip of leaf position verification rod.The MLC failure was significantly correlated with the humidity of high-pressure gas.The work time of machine exerted significant effect upon the service time of MLC parts.Conclusions The structure of the helical tomotherapy MLC system is complex.The high-intensity work increases the failure rate.The humidity of high-pressure gas affects the normal operation of the MLC equipment.The faulty parts can be identified,the downtime can be reduced and the work time can be enhanced by summarizing the experience of MLC maintenance.

At present,traditional Chinese medicine(TCM) has attracted more and more attention from the international community.The demand for TCM is increasing in the world.The hidden dangers of potential quality and safety of TCM are also becoming increasingly prominent.Aflatoxin contamination has become one of the important factors affecting the safety of Chinese herbal medicines,and it will fundamentally affect human health and life safety.A variety of methods are used to reduce aflatoxins,however,there are few suitable methods that can be widely used in the cost-effective and large-scale promotion of Chinese herbal medicines.Therefore,it is of great significance to continue to study measures to solve the pollution problems of Aspergillus flavus and its toxins.This article summarizes the hazards and contamination status of aflatoxin,the prevention and control of the growth of A. flavus, and the measures for reducing aflatoxin,and looks ahead to the future prevention and control of A. flavus and its toxins,aiming at providing ideas for the pollution problem of A. flavus and its toxin,to ensure the quality of Chinese herbal medicines,so as to ensure clinical safety medication.