Prevalence and risk factors of work-related musculoskeletal disorders among male bus drivers in a mega-city / 环境与职业医学

Background Bus drivers are a high-risk group for work-related musculoskeletal disorders (WMSDs). There are a large number of bus drivers in mega-cities. High volumes of passenger traffic and complexity of road conditions may elevate their risk of WMSDs, but there are few studies related to this group. Objective To investigate the prevalence of WMSDs among bus drivers in a mega-city and to analyze potential influencing factors. Methods Based on cross-sectional study design and self-administered questionnaire, the prevalence of WMSDs in past 12 months were estimated by stratified cluster sampling among bus drivers in a mega-city. Pearson χ2 and logistic regression models were used to analyze the influencing factors for the body regions with a high prevalence. Results The overall prevalence of WMSDs in past 12 months among bus drivers in a mega-city was 49.5% (551/1113). The prevalence of WMSDs by body regions ranged from 4.0% to 38.5%, and led by neck pain (38.5%), lower back pain (25.5%), and shoulder pain (20.8%). The results of logistic regression showed that the risk factors for neck pain were age (>50 years), smoking, tiredness after work (moderate, severe), long sitting (frequently), awkward postures (sometimes, often, frequently), overtime(occasionally, often), workplace temperature (uncomfortable), and noise (severe) (OR=2.014、1.577、2.793、3.025、2.708、2.032、3.406、2.746、1.442、2.998、1.456、3.506；P<0.05); the lower back pain risk factors were current work experience (6-10 years, 11-15 years, and 16-20 years), smoking, tiredness after work (moderate, severe), and awkward postures(sometimes, often, frequently)(OR=1.777、2.130、2.400、1.503、2.951、3.364、1.836、4.569、2.786，P<0.05); and the shoulder pain risk factors were age (46-50 years, and >50 years), smoking, tiredness after work (moderate, severe), vehicle type (hybrid power, diesel oil), awkward postures (often, frequently), overtime (often), and workplace temperature (uncomfortable) (OR=1.737、2.357、1.553、2.259、2.489、1.659、3.295、2.777、3.320、2.266、1.426，P<0.05). Identified protective factors for neck and lower back pain were off-duty physical activity (1-2 times per week, and ≥3 times per week) (OR=0.553、0.470、0.586、0.485，P<0.05). Conclusion Nearly half of the bus drivers in the mega-city report symptoms of WMSDs, mainly in the neck, lower back, and shoulders. The prevalence is related to individual and occupational factors, and prevention and intervention measures should be actively taken.

Reform and practice of teaching methods for culture of medicinal plant / 中国中药杂志

Culture of pharmaceutical plant is a comprehensive multi-disciplinary theory, which has a long history of application. In order to improve the quality of this course, some reformation schemes have been carried out, including stimulating enthusiasm for learning, refining the basic concepts and theories, promoting the case study, emphasis on latest achievements, enhancing exercise in laboratory and planting base, and guiding students to do scientific and technological innovation. Meanwhile, the authors point out some teaching problems of this course.

Effects of light quality and germplasm on growth and effective ingredients of Dendrobium officinale germchit / 中国中药杂志

Effects of light quality and germplasm on the growth and effective ingredients of Dendrobium officinale germchit were studied. Under 8 light qualities (red, blue, yellow, green and three different red blue mix light), test-tube plantlets of different families (9 x 66, 17 x 30, 78 x 68) were used in the experiment to measure economical character and determine the content of chlorophyll, polysaccharides and total alkaloids. The results showed that light quality, germplasm and their interaction had a significant effect on the growth of D. officinale germchit. The maximal root length and height of seedling were obtained under red light, under blue light, the stem diameter was thickest and the content of total alkaloids were highest, the content of chlorophyll and polysaccharides of test-tube plantlets under red blue mix light were higher than that of other treatments. This work has laid a foundation for the high quality, low carbon and efficient production of D. officinale, and gives useful tips on production of high quality ingredients.

Variation of phenolic compound contents of Magnolia officinalis at different levels / 中国中药杂志

<p><b>OBJECTIVE</b>To reveal the mutative discipline of the contents of the phenols in samples from different provenances.</p><p><b>METHOD</b>The contents of magnolol and honokiol in samples from the filial generation of Guanxi, Hubei and Zhejiang provinces were determined respectively by HPLC.</p><p><b>RESULT</b>There were significant variations between provenances, the contents of honokiol, magnolol and phenols were the highest in samples from Hubei province, those were the lowest in samples from Zhejiang province. There were not only significant differences in polyphenol content between provenances, but also in families in the same provenance and individuals in families.</p><p><b>CONCLUSION</b>Magnolia polyphenol content and appearance traits were significantly related. The type with the small convex tip (original form) were superior to other types of M. officinalis judging from the characteristics of tree classification. The high quality of M. officinalis should actually be attributed to their local varieties and the breeding strategy of M. officinalis should be paid full attention to the good provenances, good families and good individuals.</p>

Bibliometrics of woody medical plants in China / 中国中药杂志

Using the theory and method of bibliometrics, this paper made statistical analysis on the research papers of 16 main woody medical plants published in the period of 1998-2007, from aspects of years distribution, journals distribution, themes distribution, authors distribution and research institutes distribution, and so on. The results showed the studies, status quto and development potential of woody medical plants.