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Ga Yeong Kim,Sang Bin Lee,Ok Kon Moon,Ji Sung Kim,Jung Hyun Choi,Jung San Wang,Joo Hyun Park,Hong Rae Kim,Ju Hwan Lee,Kyung Ok Min 국제물리치료학회 2014 Journal of International Academy of Physical Ther Vol.5 No.2
This study investigated the effects of changes to the pulsation factor of pulsed direct currents on wound healing. Patients with a pressure ulcer at a care hospital for the elderly were randomly divided into three groups: Group 1 involved the application of 100㎲ in pulse duration, 10 ㎳ in pulse period, 100 pps in a pulsation factor, 15 ㎃ in pulse amplitude, and polarity red+ by using pulsed direct currents; Group 2 involved a change of pulse period to 8 ms; and Group 3 received general wound management. Although there were no statistically significant differences in the changing stages of pressure ulcers among the groups, all the groups dropped in numerical stages. In the two groups to which pulsed direct currents were applied, there was a statistically significant reduction in the stages of pressure ulcers from the initial assessment to the 12-week assessment (p<.05). Even though there were no statistically significant differences in changes to the area of pressure ulcers among the groups, a statistically significant decrease was found in pulsed direct current group 2 whose pulse period was shortened (p<.05). There was no difference in the healing rate of pressure ulcers among the groups, but it made a numerical increase in pulsed direct current group 1 and group 2 and a numerical decrease in group 3. There were no significant differences in the characteristics of those who had a full recovery among the groups. Those findings indicate that pulsed direct currents have positive effects on the wound healing of patients with a pressure ulcer and that a treatment with pulsed direct currents whose pulsation factor is raised by reducing the pulse duration is especially effective.
Kim, Ga-Yeong,Yun, Yeo-Myeong,Shin, Hang-Sik,Han, Jong-In Elsevier 2017 Bioresource technology Vol.224 No.-
<P><B>Abstract</B></P> <P>This study investigated if an effluent from anaerobic digestion (AD) system can be used as a nutrients source for the microalgae cultivation, and in so doing, if the effluent can be properly treated. Nitrogen and phosphorus in the AD effluent well supported microalgal growth, and their removal efficiency reached >97.9% and 99.2%, respectively. Among four different algal species tested, <I>Micractinium inermum</I> particularly stood out, showing the highest biomass and FAME productivity: 0.16gL<SUP>−1</SUP> d<SUP>−1</SUP> with 3.23gL<SUP>−1</SUP> of dry cell weight, and 0.04gL<SUP>−1</SUP> d<SUP>−1</SUP> with 27.54% (w/w) of FAME contents, respectively. As the concentrations of the nutrients decreased over time, the FAME contents were increased and its quality as well, satisfying several biodiesel quality standards. This study supports that the AD effluent can indeed serve as a cheap and nutrient-rich medium for microalgae cultivation, and equally importantly, microalgae can be a workable treatment option for it.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wastewater treatment was synergistically combined with biodiesel production. </LI> <LI> Anaerobic digester effluent was used as a nutrients source for microalgae. </LI> <LI> Nitrogen and phosphorus were successfully removed by microalgae. </LI> <LI> Among four algal species tested, <I>Micractinium inermum</I> showed the best efficiency. </LI> <LI> Both quantity and quality of microalgal lipid were improved with the passage of time. </LI> </UL> </P>