Impact of Bioreduction on Remobilization of Adsorbed Cadmium on Iron Minerals in Anoxic Condition

Ghorbanzadeh, Nasrin,Lakzian, Amir,Halajnia, Akram,Choi, Ui-Kyu,Kim, Ki-Hyun,Kim, Jong-Oh,Kurade, Mayur,Jeon, Byong-Hun Wiley (John WileySons) 2017 Water environment research Vol.89 No.6

<P>The impact of bioreduction on the remobilization of adsorbed cadmium Cd(II) on minerals, including hematite, goethite, and two iron(III)-rich clay minerals nontronites (NAU-1 and NAU-2) under anoxic conditions was investigated. Langmuir isotherm equation better described the sorption of Cd(II) onto the all minerals. The maximum adsorption capacity was 6.2, 18.1, 3.6, and 4 mg g(-1) for hematite, goethite, NAU-1 and NAU-2, respectively. The desorption of Cd(II) was due to the production of Fe(II) as a result of bioreduction of structural Fe(III) in the minerals by Shewanella putrefaciens. The bioreduction of Cd(II)-loaded Fe(III) minerals was negligible during the initial 5 days followed by a rapid increase up to 20 days. The amount of Cd(II) in solution phase at the end of 30 days increased up to 0.07 mmol L-1 for hematite, NAU-1, and NAU-2 and 0.02 mmol L(-)1 for goethite. The X-ray diffraction study showed negligible changes in bioreduced minerals phases.</P>

Effect of vibratory stimulation on pain during local anesthesia injections: a clinical trial

Ghorbanzadeh, Sajedeh,Alimadadi, Hoda,Zargar, Nazanin,Dianat, Omid The Korean Academy of Conservative Dentistry 2019 Restorative Dentistry & Endodontics Vol.44 No.4

Objectives: This study aimed to assess the effect of DentalVibe on the level of pain experienced during anesthetic injections using 2 different techniques. Materials and Methods: This randomized crossover clinical trial evaluated 60 patients who required 2-session endodontic treatment. Labial infiltration (LI) anesthesia was administered in the anterior maxilla of 30 patients, while inferior alveolar nerve block (IANB) was performed in the remaining 30 patients. 1.8 mL of 2% lidocaine was injected at a rate of 1 mL/min using a 27-gauge needle. DentalVibe was randomly assigned to either the first or second injection session. A visual analog scale was used to determine participants' pain level during needle insertion and the anesthetic injection. The paired t-test was applied to assess the efficacy of DentalVibe for pain reduction. Results: In LI anesthesia, the pain level was 12.0 ± 15.5 and 38.1 ± 21.0 during needle insertion and 19.1 ± 16.1 and 48.9 ± 24.6 during the anesthetic injection using DentalVibe and the conventional method, respectively. In IANB, the pain level was 14.1 ± 15.9 and 35.1 ± 20.8 during needle insertion and 17.3 ± 14.2 and 39.5 ± 20.8 during the anesthetic injection using DentalVibe and the conventional method, respectively. DentalVibe significantly decreased the level of pain experienced during needle insertion and the anesthetic injection in anterior LI and mandibular IANB anesthesia. Conclusions: The results suggest that DentalVibe can be used to reduce the level of pain experienced by adult patients during needle insertion and anesthetic injection.

Removal of chromium [Cr(VI)] from contaminated solutions by using biogenic ferrous iron in bioreduced minerals

Ghorbanzadeh, Nasrin,Lakzian, Amir,Halajnia, Akram,Kumar, Muthukannan Satheesh,Jeon, Byong-Hun Korean Institute of Mineral and Energy Resources E 2014 Geosystem engineering Vol.17 No.2

Impact of Shewanella oneidensis on heavy metals remobilization under reductive conditions in soil of Guilan Province, Iran

Nasrin Ghorbanzadeh,RAHUL KUMAR,이상훈,Hyun-Sung Park,전병훈 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.3

Remobilization of heavy metals in contaminated soil due to anaerobic bioreduction by Shewanella oneidensis was studied. Glucose and anthraquinone-2,6-disulphonate (AQDS) were used as an electron donor and an electron shuttle, respectively. The bioreduction caused a gradual increase in dissolved Mn(II) concentration upto 15 days followed by stationary state. The aqueous Fe(II) concentration increased and reached a highest level on the 10th day, followed by a slight decrease before the steady state was reached. The concentration of Cu(II) was at its extreme level on 5th day and then decreased before reaching the steady state. The highest dissolution was observed for Zn(II) on the 10th day followed by a decrease upto 25th day. Enhanced reduction of Fe(III) and mobilization of selected heavy metals were observed in the presence of S. oneidensis and AQDS. The soluble and acid-extractable Fe(II) concentration was higher in the presence of glucose. The remobilization efficiencies of Mn(II), Fe(II), Cu(II), and Zn(II) were 41%, 48%, 53%, and 63%, respectively. After bioreduction, Fe(II)/Cu(II) and Mn(II)/Zn(II) posed moderate and high risks, respectively. The results of this study will be useful to highlight the effects of variable redox conditions on the bioreduction process to determine the bioavailability of heavy metals in soil.

Effect of vibratory stimulation on pain during local anesthesia injections: a clinical trial

Sajedeh Ghorbanzadeh,Hoda Alimadadi,Nazanin Zargar,Omid Dianat 대한치과보존학회 2019 Restorative Dentistry & Endodontics Vol.44 No.4

Objectives This study aimed to assess the effect of DentalVibe on the level of pain experienced during anesthetic injections using 2 different techniques. Materials and Methods This randomized crossover clinical trial evaluated 60 patients who required 2-session endodontic treatment. Labial infiltration (LI) anesthesia was administered in the anterior maxilla of 30 patients, while inferior alveolar nerve block (IANB) was performed in the remaining 30 patients. 1.8 mL of 2% lidocaine was injected at a rate of 1 mL/min using a 27-gauge needle. DentalVibe was randomly assigned to either the first or second injection session. A visual analog scale was used to determine participants' pain level during needle insertion and the anesthetic injection. The paired t-test was applied to assess the efficacy of DentalVibe for pain reduction. Results In LI anesthesia, the pain level was 12.0 ± 15.5 and 38.1 ± 21.0 during needle insertion and 19.1 ± 16.1 and 48.9 ± 24.6 during the anesthetic injection using DentalVibe and the conventional method, respectively. In IANB, the pain level was 14.1 ± 15.9 and 35.1 ± 20.8 during needle insertion and 17.3 ± 14.2 and 39.5 ± 20.8 during the anesthetic injection using DentalVibe and the conventional method, respectively. DentalVibe significantly decreased the level of pain experienced during needle insertion and the anesthetic injection in anterior LI and mandibular IANB anesthesia. Conclusions The results suggest that DentalVibe can be used to reduce the level of pain experienced by adult patients during needle insertion and anesthetic injection.

Removal of arsenate and arsenite from aqueous solution by adsorption on clay minerals

Nasrin Ghorbanzadeh,정우식,Akram Halajnia,Amir Lakzian,Akhil N. Kabra,전병훈 한국자원공학회 2015 Geosystem engineering Vol.18 No.6

Sorption of arsenic species [As(V) and As(III)] on different clay minerals including kaolinite (KGa-1), montmorillonite (SWy-1), and nontronites (NAU-1 and NAU-2) with respect to sorption kinetics, isotherms and pH was investigated. As(V) and As(III) sorption on clay minerals was significantly influenced by pH. Higher sorption of As(V) was observed at low pH that decreased above pH 5.0, while As(III) sorption was maximum around pH 7.0. The sorption kinetics was well described by the pseudo-second-order equation for both As(V) and As(III). Among the tested clay minerals, NAU-2 was most effective for the removal of arsenic with rate constants of 0.084 and 0.056 g mg− 1 min− 1 for As(V) and As(III), respectively. A good correlation was observed between adsorbing capacity (qe) and equilibrium mass concentration (Ce) using the isothermal Freundlich adsorption model for SWy-1, NAU-1, and NAU-2 minerals as indicated by the high values of R2 coefficient. Our results indicate that clay minerals can serve as effective sorbents for the removal of As from contaminated water streams.

Removal of chromium [Cr(VI)] from contaminated solutions by using biogenic ferrous iron in bioreduced minerals

Nasrin Ghorbanzadeh,전병훈,Amir Lakzian,Akram Halajnia,Muthukannan Satheesh Kumar 한국자원공학회 2014 Geosystem engineering Vol.17 No.2

Abiotic reduction of Cr(VI) by ferrous iron was investigated in the presence of bioreduced goethite, hematite and two types of nontronites (NAU-1 and NAU-2). Bioreduction experiments were performed with structural Fe(III) in the minerals as sole electron acceptor, lactate as sole electron donor, Shewanella putrefaciens CN32 cells as a mediator and anthraquinone-2,6-disulfate (AQDS) was added as an electron shuttle. The results showed that bioreduction of Fe(III) occurred in all the studied minerals and the reduction increased with the application of AQDS. The maximum (21%) and minimum (3%) bioreduction of Fe(III) occurred in the nontronite (NAU-2) and hematite, respectively. The removal of Cr(VI) for all studied minerals was increased with decreasing pH. Most of the abiotic reduction of Cr(VI) by biogenic Fe(II) at pH 7 was observed in the bioreduced NAU-2 treatment with a maximum efficiency about 75%.

Challenges of the patient transition process from the intensive care unit: a qualitative study

Kobra Ghorbanzadeh,Abbas Ebadi,Mohammad Ali Hosseini,Sadat Seyed Bagher Madah,Hamidreza Khankeh 대한중환자의학회 2021 Acute and Critical Care Vol.36 No.2

Background The transition of patients from the intensive care unit (ICU) to the general ward is challenging. This study aimed to explain the challenges that patients face during the transition process. Methods In this qualitative research of conventional content analysis, data collection was conducted between February 2018 and July 2019 in educational hospitals. After obtaining informed consent, purposive sampling was performed with 22 nurses, intensive care physicians, anesthesiologists, and patients and their families using in-depth semi-structured interviews until data saturation. Results The content analysis yielded three main themes in the challenges patients face during the transition process from the ICU: mixed feelings regarding transition (happiness/hope, worry/uncertainty, abandonment); care break (different atmosphere, the difference between the program and the quality of care, assigning care to the patient and family, and care culture and beliefs); and search for support and information (ineffective communication, self-care capacity of patient and family, ineffective and disrupted training, and weak follow-up programs), which inflicts care shock in the patients. Conclusions The results showed that patients and their families were in a state of care shock during the ICU transition process and were sometimes disconcerted. It is necessary to design and implement care models according to the needs and challenges patients face during the transition period from ICU (patient-centered), based on the evidence available, and after considering the field of medicine and the accessibility of care in the country. The transition process can be improved and enhanced by obtaining knowledge about ICU care and related challenges as well as organizing a learning environment.

Isolation and Identification of Ferric Reducing Bacteria and Evaluation of their Roles in Iron Availability in Two Calcareous Soils

Nasrin Ghorbanzadeh,Amir Lakzian,Gholam Hosain Haghnia,Ali Reza Karimi 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Effect of Nanosilica on the Mechanical and Thermal Properties of Carbon Fiber/Polycarbonate Laminates

M. Fathalian,M. Ghorbanzadeh Ahangari,A. Fereidoon 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8

An investigation of nanosilica (SiO2), influencing the mechanical and thermal attributes of carbon fiber (CF)/polycarbonate (PC) laminates, is described in this study. Polycarbonates with four different weight percentages of SiO2 (PCSiO2,0.1, 0.3, 0.6 and 1.0 wt%) were prepared using a melt-blending technique. The PC-SiO2 nanocomposites were thenused to fabricate planar CF/PC laminates through a hot hydraulic press machine. The prepared laminates were characterizedby a number of different techniques; namely, tensile tests, dynamic mechanical thermal analysis (DMTA), differentialscanning calorimetry (DSC), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). The tensile testfindings revealed that when 0.6 wt% of SiO2 was added to the laminate layers, the maximum tensile modulus and yield stresswere achieved. The mechanical properties obtained by DMTA supported the tensile test results. It should be noted that the0.6 wt% of SiO2 had the highest mechanical properties. The DMTA and DSC analyses were used to measure the glasstransition temperatures (Tg) of laminates. We found that with the addition 0.6 wt% of SiO2 the Tg increased to approximately1 oC compared to 0 oC for the neat CF/PC laminate, meaning that by adding up 0.1 to 0.6 nanosilica to the polymer, the valueTg first increased and then decreased. To characterize the mass loss, the thermal degradation of polycarbonate influenced bynitrogen was investigated through TGA. According to our TGA results, the highest thermal stability was achieved by adding0.6 wt% of SiO2 to the PC.