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各種織物販賣場 大氣內의 Formaldehyde 濃度調査
鄭啓憲 서울大學校 保健大學院 1968 公衆保健雜誌 Vol.5 No.2
This survey was conducted to determine the concentrations of formaldehyde (HCHO) in the atmosphere of the textile stores during the period of 1 Aug., 1968∼30 Sept., 1968 and another survey was carried out to find out the health conditions of the subjects who worked in the textile stores during this period. From the results of these studies, the following conclusions were obtained: 1. The average daily concentrations of HCHO in the atmosphere of the textile stores the synthetic fabrices stores without ventilators showed the highest (7.9ppm), and it was the lowest (0.9ppm) at the cotton fabrics stores. All other stores which did not deal with textiles was shown an average daily reading of 0.6 ppm. 2. The variations in the concentrations of HCHO with relation to the time of day were the highest from 3 to 4 o'clock in the afternoon, and were the lowest from 9 to 10 o'clock which was right after the stores were opened in the morning. 3. Almost 100% of subjects who answered the questionnaire reported symptoms of formaldehyde irritation. The highest rate (88.5%) of complaints of general symptoms was among women who worked in the synthetic fabrics stores and the lowest(52.9%) among men working in the clothing stores. 4. The percent of irritating symptoms which were reported as "sick at present" were as follow : 70.4%(the highest frequency rate) reported by women who worked in the synthetic fabrics stores and 12.6% (the lowest frequency rate) reported by men working in the general goods stores. The frequency rates of the general symptoms were as follow: 48.4% reported by women who worked in the synthetic fabrics stores and 12.6% reported by men working in the clothing stores. 5. The incubation period of the irritating symptoms of women who worked in the synthetic fabrics stores was the shortest, with 1.5 years and the longest, with 3.2 years to men who worked in the clothing stores. The incubation period of the general symptoms were almost same to all the subjects, between the periods 3∼4 years. 6. In the atmosphere of the textile markets, the concentrations of formaldehyde were the highest at the synthetic fabrics stores. The concentrations of formaldehyde were considerably over the maximum allowable concentration (M.A.C. : 5 ppm) in the atmosphere of all the synthetic fabrics stores and most of the silk fabrics stores. The relative rise in prevalence with the increased concentration of HCHO was more pronounced for the irritating symptoms and general symptoms. The incubation periods were relatively short at the textile stores which were under the high concentrations of formaldehyde. Under the same circumstances, women were more sensitive to HCHO than men. 7. For the prevention of the injurious effects resulting from exposures to HCHO, it is essential that its concentration in the atmospheric air of the textile stores be kept below 5 ppm, and that the formaldehyde-type resins should not be used in the manufacture of textiles. All synthetic fabrics should be sold in the synthetic fabrics stores only and the temperature in the air of the synthetic fabrics stores be kept 17∼20℃. The contaminated atmospheric air of the textile stores should be exchanged with fresh air. All workers working in the textile stores should be taken periodic medical examination and all persons showing sign of irritation should be exclued from further exposure until these conditions being arrested completely.
고정화 및 저장 온도에 따른 Photobacterium phosphoreum의 Bioluminescence 안정성의 변화
김현숙,정계훈,전억한 경희대학교 생명자원과학연구원 1998 硏究論文集 Vol.19 No.-
P phosphoreum의 고정화에 있어 중요한 것은 matrix의 선택이며, matrix로서 soudium alginate만을 사용하여 고정화 하는 것보다는 strontium chloride를 첨가하여 gel의 견고성을 높여주었을 때 세포의 bioluminescence 유지도가 증가하였다. 저장온도에 따른 세포의 bioluminescence 유지도와 활성도와 관련하여 -70℃, -20℃, 20℃에서 저장한 세포의 경우 저장 1일 후에 급격한 bioluminescence의 감소를 보였으며 낮은 세포 활성도를 보인 반면 4℃의 경우 bioluminescence의 유지도가 15일 이상 이어졌으며 높은 활성도를 나타내었다. 따라서 P phosphoreum의 bioluminescence 안정성에 있어 가장 좋은 결과를 나타낸 것은 2.5%(W/W) sodium alginated와 0.3M(W/V) strontium chloride로 고정화하여 4℃에 저장한 세포였다. The objective of this work was to unprove biolummescence stability of Photobacterium phosphoreum when stored at different temperature in view of developing contmuous on-line monitonng system for pollutants m environment. A long-term experiment was performed to determine how immobilization affects the mamtenance and stability of biolummescence from luminescent bacteria at appropnate temperature. The unmobhzed cells of P. phosphoreum were compared with free cells m terms of mamtenance of biolummescence at room temperature. It was found that the biolummescence of cells immobilized on strontium alginate showed higher biolummescence mtensity than both free and mixed cells with only algmate as a matrix. The effect of temperature on the biolummescence stability was investigated with free and immobilized cells stored at 20℃, 4℃, -20℃ and -70℃ for 20 days. Both free and immobilized cells stored at 4℃ emtted a stable biolummescence whde the biolummescence markedly decreased with those stored at 20℃, -20℃ and -70℃.
쪽파[Allium ascalonicum L.] 재배기간 중 Diazinon, Iprodione 및 Chlorfenapyr의 잔류랑 변화
고광용,나은식,김성헌,김상준,장영희,이규승 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.2
In order to know the residual pattern of pesticides and predict to the degradation period until below MRL, we experimented diazinon, iprodinon and chlorfenapyr for shallot. They were the most detected pesticide in shallot by NAQS (National Agricultural product Quality management Service) survey. In this experiment, we sprayed those pesticides 15days before harvest and analyzed 0, 1, 2, 3, 5, 7, 10, 14 day sample to establish logical equation and to calculate DT_(50). During the cultivating period, the residue amount of diazinon was changed from 1.02 mg/kg (0 day) to 0.01 mg/kg (14 day), DT_(50) was 2.19 days, and iprodione was changed from 1.45 mg/kg (0 day) to 0.14 mg/kg (14 day), DT_(50) was 4.15 days, and chlorfenapyr was changed from 1.5 mg/kg (0 day) to 0.01 mg/kg (14 day), DT_(50) was 1.97 days. The DT_(50) of double amount in those pesticides, diazinon was 2.24 days, iprodione was 4.82 days, and chlorfenapyr was 2.24 days, respectively.
Kye Hun Kim 한국지질동맥경화학회 2024 지질·동맥경화학회지 Vol.13 No.1
COVID-19 vaccination has played a pivotal role in coping with the COVID-19 pandemic by providing a powerful tool to curb the spread of the virus, reduce severe illness and hospitalizations, and ultimately save lives and facilitate a return to normal daily routines. As COVID-19 vaccination has become more widespread and more individuals have recovered from the infection, COVID-19 has entered an endemic disease phase. This phase is characterized by a less severe and more stable pattern of infection within certain regions, similar to the predictability of seasonal influenza. In this endemic era, COVID-19 vaccines may appear to be less important, and many people are reluctant to receive COVID-19 vaccination for various reasons, including the fear of adverse events. However, COVID-19 remains a major public health problem, in that the incidence rate of new COVID-19 infections is still high and the morbidity and mortality in high-risk populations are substantial. Therefore, the role of COVID-19 vaccines in protecting high-risk individuals is crucial, and ongoing research and surveillance are imperative to refine vaccination recommendations in the ever-changing landscape of the COVID-19 endemic era. This review explores the role of COVID-19 vaccination in the upcoming COVID-19 endemic era.