• Journal of Microbiology and Biotechnology
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• 제33권4호
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• pp.419-429
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• 2023

Ultraviolet C (UV-C, 200-280 nm) light has germicidal properties that inactivate a wide range of pathogenic and spoilage microorganisms. UV-C has been extensively studied as an alternative to thermal decontamination of fruit juices. Recent studies suggest that the efficacy of UV-C irradiation in reducing microorganisms in fruit juices is greatly dependent on the characteristics of the target microorganisms, juice matrices, and parameters of the UV-C treatment procedure, such as equipment and processing. Based on evidence from recent studies, this review describes how the characteristics of target microorganisms (e.g., type of microorganism/strain, acid adaptation, physiological states, single/composite inoculum, spore, etc.) and fruit juice matrices (e.g., UV absorbance, UV transmittance, turbidity, soluble solid content, pH, color, etc.) affect the efficacy of UV-C. We also discuss the influences on UV-C treatment efficacy of parameters, including UV-C light source, reactor conditions (e.g., continuous/batch, size, thickness, volume, diameter, outer case, configuration/arrangement), pumping/flow system conditions (e.g., sample flow rate and pattern, sample residence time, number of cycles), homogenization conditions (e.g., continuous flow/recirculation, stirring, mixing), and cleaning capability of the reactor. The collective facts indicate the immense potential of UV-C irradiation in the fruit juice industry. Existing drawbacks need to be addressed in future studies before the technique is applicable at the industrial scale.

• 한국의류산업학회지
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• 제25권3호
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• pp.386-397
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• 2023

In this study, the efficacy of ultrasonic washing in cotton and wool fabrics was compared and evaluated against conventional washing in terms of cleaning properties and fabric deformation. Factors such as washing temperature, time, liquid ratio, and detergent concentration were kept varied, and the cleaning properties of sebum-soiled fabrics were assessed using different detergents such as alcohol ethoxylate, linear alkylbenzenesulfonate, and IEC 60456 Reference Detergent A^*. In addition, the effects and emulsification power of enzymes and oxygen bleach were examined. To compare the cleaning properties with general washing, a launder-O-meter was used. To investigate fabric deformation during the washing process, the loosening test cloth, shrinkage test cloth, and mechanical strength test cloth were compared between ultrasonic washing machines and household drum washing machines. The results indicate that ultrasonic washing exhibits superior cleaning properties than launder-O-meter when the temperature is low and the washing time is short. Furthermore, there is less deformation and damage during the washing process. It was also observed that the activity of the detergent increases when ultrasonic waves are applied to the washing process. Considering the increasing tendency to pursue convenience and simplicity in clothing management as well as the anticipated commercialization of smart clothing with built-in electric circuits, ultrasonic laundry could serve as a new alternative to existing laundry methods.

• Restorative Dentistry and Endodontics
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• 제46권1호
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• pp.13.1-13.9
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• 2021

Objectives: This study aimed to evaluate and compare the efficacy of the S1 reciprocating system and the D-Race retreatment rotary system for filling material removal and the apical extrusion of debris. Materials and Methods: Sixty-four freshly extracted maxillary canines were shaped with size 10 and size 15 K-files, instrumented using ProTaper Gold under irrigation with 2.5% sodium hypochlorite (NaOCl), obturated according to the principle of thermo-mechanical condensation with gutta-percha and zinc oxide eugenol sealer, and allowed to set for 3 weeks at 37℃. Subsequently, the teeth were divided into a control group (n = 4), the D-Race rotary instrument group (n = 30), and the S1 reciprocating instrument group (n = 30). After classical retreatment, the canals were subjected to a complementary approach with the XP-Endo Shaper. Desocclusol was used as a solvent, and irrigation with 2.5% NaOCl was performed. Each group was divided into subgroups according to the timing of radiographic readings. The images were imported into a software program to measure the remaining filling material, the apical extrusion, and the root canal space. The data were statistically analyzed using the Z-test and JASP graphics software. Results: No significant differences were found between the D-Race and S1 groups for primary retreatment; however, using a complementary cleaning method increased the removal of remnant filling (p < 0.05). Conclusions: Classical removal of canal filling material may not be sufficient for root canal disinfection, although a complementary finishing approach improved the results. Nevertheless, all systems left some debris and caused apical extrusion.

• Journal of Biosystems Engineering
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• 제40권2호
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• pp.145-152
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• 2015

Purpose: The inability to adequately judge the efficacy of cleaning and sanitation procedures in deli departments is a recognized food safety concern. In a prior study, our research group demonstrated that visual inspection of cleaned produce processing surfaces could be enhanced through the use of a portable fluorescence imaging device that detected residual produce residues. Methods: To explore the feasibility of using fluorescence imaging to similarly detect residual deli residues, spectra of American, Cheddar, Provolone, and Swiss cheeses and of processed chicken, ham, roast beef, and turkey were acquired using a laboratory hyperspectral imaging system. Circular punches of these commodities were placed onto stainless steel and high density polyethylene coupons for imaging. The coupon materials were selected to represent common surfaces found in deli departments. Results: Analysis of hyperspectral fluorescence images showed that cheeses exhibited peaks in the blue-green region and at around 675 nm. Meats exhibited peaks in the blue-green region with one of four ham and one of four chicken brands exhibiting peaks at around 675 nm, presumably due to use of plant-derived additives. When commodities were intermittently imaged over two weeks, locations of spectral peaks were preserved while intensity of peaks at shorter wavelengths increased with time. Conclusion: These results demonstrate that fluorescence imaging techniques have the potential to enhance surface hygiene inspection in deli departments and, given the immediate availability of imaging results, to help optimize routine cleaning procedures.

• 한국염색가공학회지
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• 제32권2호
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• pp.89-95
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• 2020

In this study, the efficacy of Amaranth(Amaranthus spp. L.) as a natural dye resource was investigated for wool fabrics. It is known that a large amount of flavonoid and anthocyanin colorant are contained in leaves and stems, as well as red flowers. The optimum condition of dyeing was 1.3% of dye concentration(o.w.b.) at 100℃ for 60 minutes, resulting the K/S value, 23.43 and R Munsell color on the wool fabrics. Al, Fe, Zinc and Titanium were used as a mordant. The mordant improved the dye uptake, regardless of the mordant type and mordant method. The pre-mordanting method was more effective than the post-mordanting method. Al pre-mordanted fabric showed the highest K/S, 30.02. Light fastness and washing fastness were high in grades 4-5 and 5, and rubbing fastness was good in grades 4 and 4-5 in dry condition, but low in grades 2-3 and 3 in wet condition. The dry cleaning fastness was excellent in all 5 grades. However, the alkaline perspiration fastness ratings were low in grades 2-3 and 3. The results show Amaranthus spp. L. colorant can be used as a functional natural dye for wool fabrics.

• 대한치과의사협회지
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• 제53권10호
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• pp.743-750
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• 2015

Objectives: This study compared the mechanical efficacy of sonic activated and passive ultrasonic irrigation for removing intracanal medicament from a simulated root canal under controlled conditions. Materials and Methods: Thirty simulated root canal in resin blocks were randomly divided into 3-groups. The canals were enlarged using ProTaper files and K3XF (#30/0.06). After cleaning and drying, canals were filled with Calcipex. Overfilled materials were wiped out and measured their weight to the unit of 1/10mg. After one week storage in 100% humidity $37^{\circ}C$ temperature, canals were irrigated using 20mL of saline with one of following methods according to the designated groups (n = 10). For group-NI, 30-gauge nickel-titanium irrigation needle was used. During irrigation with every 5mL, needle was moved in-and-out with 4-mm amplitudes. EndoActivator and ultrasonic tip were used for group-EA and group-UT respectively for 20 seconds after every 5mL irrigation using needle. Then the weight was measured again to calculate the weight of residual remnants. The data were analyzed by one-way ANOVA and Duncan's post-hoc test at a significance level of 95%. Results: The weight of the residual medicaments were $3.62{\pm}0.81mg$, $2.84{\pm}0.28mg$, and $2.73{\pm}0.90mg$ for group-NI, -EA, and -UT, respectively. Group-EA and group-UT had no significant differences to remove intracanal medicament and left significantly less amount of paste than group-NI (p < 0.05). Conclusions: Under the controlled conditions of this study, the sonic activation and PUI have similar mechanical efficacy for removing intracanal medicament.

• 대한청각학회지
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• 제23권1호
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• pp.15-19
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• 2019

Background and Objectives: To determine the efficacy of filling the external auditory meatus with 1% clotrimazole at a single visit for the treatment of otomycosis. Subjects and Methods: This prospective study included 40 patients who were referred to our clinic with complaints of ear itching, pain, and fullness, and were diagnosed with unilateral otomycosis. After cleaning the mycotic hyphae from the external auditory meatus, the ear canal was filled with 1% clotrimazole, using an intravenous catheter and syringe. The patients received follow-up examinations on post-treatment days 7, 15, and 45. Results: The follow-up otomicroscopic examinations revealed that 95% of the ear canals were entirely clean and that all symptoms had resolved. The post-treatment scores of pain, aural fullness and itching were significantly lower than the pre-treatment scores (p<0.01). Conclusions: Filling the external auditory meatus with 1% clotrimazole at a single visit is an easy, efficient, and cost-effective treatment for otomycosis. Additionally, high patient compliance makes this treatment superior to long-term topical therapy.

• Journal of Audiology & Otology
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• 제23권1호
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• pp.15-19
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• 2019

Background and Objectives: To determine the efficacy of filling the external auditory meatus with 1% clotrimazole at a single visit for the treatment of otomycosis. Subjects and Methods: This prospective study included 40 patients who were referred to our clinic with complaints of ear itching, pain, and fullness, and were diagnosed with unilateral otomycosis. After cleaning the mycotic hyphae from the external auditory meatus, the ear canal was filled with 1% clotrimazole, using an intravenous catheter and syringe. The patients received follow-up examinations on post-treatment days 7, 15, and 45. Results: The follow-up otomicroscopic examinations revealed that 95% of the ear canals were entirely clean and that all symptoms had resolved. The post-treatment scores of pain, aural fullness and itching were significantly lower than the pre-treatment scores (p<0.01). Conclusions: Filling the external auditory meatus with 1% clotrimazole at a single visit is an easy, efficient, and cost-effective treatment for otomycosis. Additionally, high patient compliance makes this treatment superior to long-term topical therapy.

• Restorative Dentistry and Endodontics
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• 제34권3호
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• pp.215-222
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• 2009

본 연구의 목적은 isthmus가 존재하는 하악 대구치의 근심 근관에서 근관세척방법에 따른 잔사제거효과를 평가하는 것이다. 45개의 하악 대구치의 근심근관을 #30 Profile .06까지 확대하였다. 각 근관을 3개의 군으로 나누고 conventional irrigation syringe와 초음파, RinsEndo를 사용하여 1분간 최종 세척하였다. 조직표본을 제작한 후, 광학현미경으로 치근단 1, 3, 5 mm 부위의 단면을 관찰하였다. 근관과 isthmus의 잔사 양으로 청결도를 계산하고 Mann-Whitney U test로 검정하였다. 1. 초음파 군과 syringe군은 5 mm부위의 isthmus를 제외한 나머지 부위에서 청결도의 유의한 차이가 없었다. 2. RinsEndo군은 syringe군에 비해 1 mm, 3 mm부위의 근관과, 모든 부위의 isthmus에서 유의하게 높은 청결도를 나타내었다 (p<0.05). 3.초음파 군과 RinsEndo군은 3mm부위의 근관을 제외한 나머지 부위에서 청결도의 유의한 차이가 없었다. 임상적으로 RinsEndo를 이용한 근관세척방법의 부가적인 적용이 하악 대구치의 근심근관의 잔사제거에 효과가 있을 것으로 사료된다.

• 한국안광학회지
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• 제19권1호
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• pp.51-57
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• 2014

목적: 본 연구에서는 콘택트렌즈 단백질제거제 개발 시 요구되는 단백질 제거효능의 적절한 평가를 위한 시험법을 확립하고 이를 실제 콘택트렌즈에 침착된 단백질의 제거효율을 측정한 결과와 비교, 분석하여 단백질제거제의 효능 평가법으로 제시하고자 하였다. 방법: 대한약전에 제시된 단백소화력 시험법을 이용하여 파파인, 판크레아틴, 섭틸리신 A 및 프로테아제와 각각의 효소가 포함된 단백질제거 정 또는 용액의 효능평가에 적절한 시험조건을 찾고자 하였다. 또한, balafilcon A 재질 렌즈에 인위적으로 침착시킨 단백질을 시판되고 있는 단백질제거 정 또는 용액으로 제거하여 세척효율을 확인하고 이들 방법의 상관관계를 분석하였다. 결과: 판크레아틴과 판크레아틴 함유 제품의 경우 단백소화력 시험법으로 평가하였을 때 둘 다 약전에서 제시하는 판크레아틴 단백소화력 기준값인 28 IU/mg를 충족하였다. 프로테아제와 삼염화아세트산 B 용액으로 실험한 섭틸리신 A의 경우는 단백소화력 시험법으로 평가하였을 때 제조사에서 제시한 효소활성 값을 충족하였으나, 파파인과 삼염화아세트산 A 용액으로 실험한 섭틸리신 A는 제조사에서 제시된 효소활성 값에 해당하는 단백소화력이 측정되지 않았다. 시판되는 단백질제거제의 경우 판크레아틴을 함유한 제품을 제외한 나머지 세 가지 제품은 단백소화력 시험법으로는 제조사에서 명시한 효소들의 단백질 효소활성 값을 확인할 수 없었다. 그러나 실제 렌즈에 침착된 단백질의 제거정도를 측정하였을 때에는 파파인을 함유한 제품을 제외한 3종의 단백질제거제는 모두 90%가 넘는 단백질 제거효율을 보였다. 파파인 함유 단백질제거제의 경우 단백소화력 시험법으로는 효능 측정이 불가능하였으나 실제 렌즈에 침착된 누액단백질 제거효율은 73.72%에 이르렀다. 결론: 본 연구결과로 콘택트렌즈 단백질제거제의 효능은 함유되어 있는 단백분해효소의 종류에 따라 시험법을 달리하여 평가되어야 함을 확인할 수 있었다. 즉, 판크레아틴, 프로테아제, 섭틸리신 A를 함유하는 단백질제거제는 단백소화력 시험법과 단백질제거효율 측정법으로 효능평가가 가능하고, 파파인을 함유하는 단백질제거제의 평가는 콘택트렌즈를 이용한 단백질제거효율 측정법만이 효율적임을 제안할 수 있다.