DJS水系对米曲霉酶活力提高的研究

研究了DJS水系在酿造酱油制曲中产酶及其活力的影响。试验中与自来水介质进行比较,结果表明:DJS水系能改变米曲霉的孢子数,对其酶活力的提高有显著的影响;在DJS-A介质中的孢子产量虽少于DJS-B介质,而其中的酶活力却较高。     

用DJS提高酱油生产过程中抽提物的研究

文中研究的是DJS对酱油生产质量的影响,在酱油中,已知含有300多种微量成分。我介利用DJS具有的良好的溶解渗透性,使酱油醅中的有效成分得到更大限度的提取。该研究是在与普通自来水相同的条件下,通过控制不同的温度与时间,得到DJS－A,DJS－B与普通自来水浸提成分的对比结果,其结果体现在全氮,pH值,总酸,氨基态氮,可溶性无盐固形物,NaCl与色度等酱油的指标中。     

用DJS提高液体醋产量的研究

DJS是一种具有特殊性能和用途的液体,将它应用于生物工程方面,显示出了很好的使用价值。该研究是利用DJS代替食醋生产中的配料用水,与自来水进行对比生产实验研究。结果其出酒率、出醋率均高于自来水对比组。     

用DJS-A提高酒精出酒率的研究

DJS是一种具有特殊性能和用途的液体，将它应用于生物工程方面，显示出了很好的使用价值。利用DJS－A取代玉米酒精生产中的生产配料用水做了实验，各工艺条件与自然水作为生产用水时完全一致。实验中DJS与自来水作平行试验进行对比，72h时其出酒率高于自来水对照组8％－9％。     

Posture and lifting exposures for daycare workers

Daycare employees, specifically caregivers, are a distinct population that may experience increased risk of injury due to the high exposure to bent postures, lifting conditions and high stress associated with their work. The objectives of the study were to collect up to date data on daycare workers and to compare the data between groups working with children of different ages (Infant, Toddler and Preschool). The study consisted of two distinct phases: Phase 1 – Questionnaire distribution, Phase 2 – Observation and analysis involving three dimensional postural monitoring and video recording as well as an analysis of the low back forces and moments in lifting. Phase 1: Consisted of the distribution of questionnaires to all employees in each of the participating daycares (n = 73). Of the 73 questionnaires distributed 32 responses were obtained (44%). Of the 32 employees who completed the questionnaires, 19 caregivers volunteered to participate in Phase 2 of the study. An additional 5 caregivers participated in phase 2 of the study, but did not complete any questionnaires. The questionnaires indicated 81% of the workers have experienced low back pain. Phase 2: Observational data were collected on site in five local daycares, throughout the first half of each subject's shift (∼3.5 h). Caregivers from each of the three classroom age groups were recruited for participation in the direct observation (Infant: n = 7, Toddler: n = 7, Preschool: n = 8). Posture analysis revealed that on average, workers adopted trunk flexion angles greater than 55°, for 10% of the collection time, and greater than 70°, for 5% of the collection time. These postures correspond to both moderate and severe flexed postures respectively. The lifting analysis (completed using the data recorded in phase 2) revealed that workers lifted with frequencies of 0.25 lifts/minute, lifted a total weight of 501 kg (over 3.3 h) and experienced average compression and shear forces of 3323 N and 371 N, respectively. A between-group comparison showed that when compared to the Preschool group, the Infant (p = 0.008) and Toddler (p = 0.001) groups demonstrated higher relative flexed postures and lifting frequencies, and the Toddler group (p = 0.023) demonstrated higher total weight lifted. Results suggested that these employees experience an elevated risk of low back injury caused by their occupational tasks and thus, further research is required to determine appropriate worker accommodations and safe work practices to help mediate these risks for all daycare caregivers.Relevance to industryIt is thought that the results from this study could lead to the development of safe working and job sharing guidelines for daycare workers.