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Biological evaluation of selective laser melted magnesium alloy powder

Pawlak Andrzej P., Szymczyk-Ziółkowska Patrycja E., Junka Adam, Chlebus Edward

Acta of Bioengineering and Biomechanics

2021

Vol. 23, no. 1

121--133

Purpose: The current study examined magnesium alloy AZ31B specimens manufactured with Additive Manufacturing method (selective laser melting – SLM) to investigate the applicability of this technology for the production of medical devices. Methods: Osteoblast cells and bacterial biofilm growth ability on specimen was examined and the effect of surface state on corrosion resistance was evaluated by electrochemical and immersion methods. Results: High survival of hFOB cells, as well as a strong tendency for Pseudomonas aeruginosa and Staphylococcus aureus biofilm proliferation on the surface of the tested specimens were shown. SLM-processed AZ31B alloy has a higher corrosion resistance in 0.9% NaCl solution and in a multi-electrolyte saline solution than the material in a conventional form of a rolled sheet. Conclusions: It has been demonstrated that the strong development of the surface of as-built processed specimens results in a significantly increased corrosion rate, which hinders the production of complex structures in tissue engineering products that support cell ingrowth.

Biologiczna ocena działania oczyszczalni hydrofitowej

Wysocka M.

Budownictwo i Inżynieria Środowiska

2018

Vol. 9, no. 3

143--148

W artykule został poruszony problem biologicznej oceny działania oczyszczalni hydrofitowej. Obiekt badawczy stanowiła oczyszczalnia hydrofitowa położona w miejscowości Zwierki w gminie Zabłudów. W celu dokonania biologicznej oceny działania oczyszczalni wykonano badania wybranych wskaźników mikrobiologicznych. Wykonano posiewy próbek ścieków surowych, ścieków oczyszczonych oraz wód pobranych ze stawu odbierającego ścieki oczyszczone. W wyniku badań stwierdzono, iż złoże hydrofitowe w redukuje ilość drobnoustrojów obecnych w ściekach surowych. Natomiast w stawie odbierającym ścieki dochodzi do wtórnego zanieczyszczenia biologicznego.

This article discusses the problem of biological evaluation of the constructed wetlands. The constructed wetland located in Zwierki in the Zabłudów commune was a research facility. Biological evaluation of the constructed wetland was made by taking samples of raw sewage, treated sewage flowing out of the deposit and water from the receiving pond. Cultures were made on individual media to determine the presence or amount of the microorganisms concerned. After incubation, the approximate number of microorganisms on solid media was calculated. As a result of the research, it was found that the constructed wetland to some extent reduces the amount of microorganisms present in raw sewage. However, in the receiving pond, secondary biological pollution occurs.

Evaluation of the biocompatibility of a hydroxyapatite-CaTiO3 coating in vivo

Wu S., Tu B., Lin J., Wang Z., Wang X., Shen M., Hu R.

Biocybernetics and Biomedical Engineering

2015

Vol. 35, no. 4

296--303

Objective: This study was designed to evaluate the biocompatibility and osteointegrative activity of hydroxyapatite (HA)-CaTiO3, titanium substrate, traditional HA coating and CaTiO3 coating via an animal experiment. Method: Four types of screws (type 1: coated with HA; type 2: coated with CaTiO3; type 3: coated with HA-CaTiO3; type 4: untreated titanium screws) were implanted into femur bone of 48 New Zealand rabbits. Histological and mechanical investigations were employed at the end of 2, 4, 8 and 12 weeks to evaluate the material osteointegration. Results: (1) All of the experimental rabbits were healthy during the experiment process. (2) Histological investigation showed fully regenerated and well integrated bone tissue surrounding the screws coated with HA, HA-CaTiO3 and CaTiO3. (3) Mechanical investigation showed that the bonding strength of HA-CaTiO3 coating was significantly higher than that of CaTiO3 coating or titanium materials without coating, but was lower than those coated with HA. Conclusion: HA-CaTiO3 coating possesses similar admirable biocompatibility and osteointegration activity with HA coating, indicating a promising coating material for implants in orthopedics.