Multi-physics simulation and experimental study of the reaction kinetics process of oxygen inhibition zone formation in constrained-surface stereolithography process

2021 ◽  
pp. 102280
Author(s):  
Quandai Wang ◽  
Junru Wang ◽  
Ying Zhang ◽  
Yong Liu ◽  
Jianming Zheng ◽  
...  
2019 ◽  
Vol 2 (3) ◽  
pp. 223
Author(s):  
Fitri Nadifah ◽  
Desto Arisandi ◽  
Siti Fatimah ◽  
Dani Setiawan

Klebsiella pneumoniae is one of the most bacteria found in urine of Urinary Tract Infection (UTI) Patients. Study in many countries has found that this species become resistant to more than one antibiotics. This research goal is to know the effectiveness of talok (Muntingia calabura) infused water inhibiting the growth of K. pneumoniae. This was an experimental study using K. pneumoniae bacteria isolated from urine samples using diffuse agar method. The concentration of talok infused water was varied from 25-100% and the antibiotics used was cefotaxime, meropenem and chloramphenicol. The inhibition activity was measured by the diameter of inhibition zone. The results show that K. pneumoniae is still give sensitive response to antibiotic treatments. While the inhibition zone from talok infused water treatments can be categorized in middle and strong activity. From this study we can conclude that talok infused water potential in inhibiting the growth of K. pneumoniae. Future study still needed to develop this potential, especially for the bacteria that has been resistant to some antibiotics.


2020 ◽  
Vol 1 (2) ◽  
pp. 7
Author(s):  
Dyah Widiastuti ◽  
Ihda Zuyina Zuyina Ratna Sari ◽  
Isya Fikria Kalimah ◽  
Endang Setiani

Hand hygiene is one of the important factors that determine a person's health status. Hands are easily contaminated by microbes from the environment such as bacteria, viruses, and fungi through direct contact. Hand sanitizer is a type of media that can be used to clean hands from disease-causing microbes other than soap. Hand sanitizers are widely used by the community because they are considered more practical to use. This study aims to determine the anti-fungal activity of the hand sanitizer recommended by the World Health Organization (WHO) against Candida albicans. Anti-fungal activity was tested using the well diffusion method. The results showed that the higher the concentration of the hand sanitizer, the bigger the inhibition zone formed. The statistical test results obtained a significance value of p <0.05 at the variation of the concentration of hand sanitizer 50%, 75%, 100%, and treatment control. These results indicate that there is a significant difference between the hand sanitizer treatment and control of the inhibition zone formation in C. albicans. The WHO recommended hand sanitizer has medium inhibitory power against C. albicans bacteria.


2020 ◽  
pp. 117-121
Author(s):  
Sem Samuel Surja ◽  
Gabi Vania Sally ◽  
Favian Sergius Ruby Hartoyo ◽  
Sandy Vitria Kurniawan ◽  
Yanto Budiman

Background: A good collection of fungi culture can be maintained with good preservation methods. With appropriate methods, preservation can be performed in low-budget laboratories, such as with periodic subculture and preservation in either sterile water or in paraffin oil. The aim of this study was to assess the viability, morphology, contamination, and antifungal susceptibility profile of fungi preserved in sterile water or paraffin oil compared to a periodic subculture. Methods: This study was an experimental study using Aspergillus sp., Trichophyton mentagrophytes and Candida albicans. The fungi were preserved by a periodic subculture or in sterile water or in paraffin oil for six months. A comparison of viability, morphology, contamination, and antifungal susceptibility profile between methods were made before and after six months of study. Results: The viability of all the fungi was maintained in both periodic subculture and preservation with paraffin oil. However, the T. mentagrophytes was not viable in preservation using sterile water. All methods could maintain the morphology without contamination. There were reductions in the inhibition zone against antifungal drug in preservation with sterile water and paraffin oil. Conclusion: Preservation in paraffin oil is superior to preservation in sterile water in terms of maintaining fungal viability. This method is suitable for the use in a simple laboratory, albeit considerations should be given to the reduction of inhibition zone.


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