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A microfluidic electrochemical aptasensor for enrichment and detection of bisphenol A.
Kashefi-Kheyrabadi, Leila,Kim, Junmoo,Gwak, Hogyeong,Hyun, Kyung-A.,Bae, Nam Ho,Lee, Seok Jae,Jung, Hyo-Il Elsevier 2018 Biosensors & bioelectronics Vol.117 No.-
<P><B>Abstract</B></P> <P>Bisphenol A (BPA) is an organic monomer used to make common consumer goods such as plastic containers, sports equipment, and cosmetics which are heavily produced worldwide. A growing interest has been drawn to general public as BPA is one of the major endocrine disrupting chemicals threating human health. To date, numerous BPA sensors have been attempted to be developed but important challenges still remained such as limited linearity range, easy to use, and long term response time. To address the present issues, a microfluidic channel should be integrated into an electrochemical aptasensor and it is called Geometrically Activated Surface Interaction (GASI) chip. The vigorous generation of the micro-vortex in the GASI fluidic chamber provides the high collision chances between BPA and anti-BPA aptamer (BPAPT) and consequently more BPA molecules can be captured on the aptasensor surface, which finally results in high sensitivity of the aptasensor. To construct the integrated aptasensor, a miniaturized gold electrode is fabricated using shadow mask and e-beam evaporation process. Afterward, BPAPT is immobilized on a nanostructured gold electrode via thiol chemistry, and other terminus of the aptamer is labeled with a ferrocene (Fc) redox probe. Then, the microfluidic channel is mounted over the miniaturized gold electrode to introduce and enrich BPA to the aptasensor. Upon the specific interaction between BPA and its aptamer, configuration of aptamer is changed so that Fc tag approaches to the electrode surface and direct oxidation signal of Fc and BPA are followed as analytical signals. The unique microfluidic integrated electrochemical aptasensor delivers a wide linear dynamic range over 5 × 10<SUP>–12</SUP> to 1 × 10<SUP>−9</SUP> M, with a limit of detection 2 × 10<SUP>–13</SUP> M. This aptasensor provides a precise platform for simple, selective and more importantly rapid detection of BPA. Such kind of sensing platforms can serve as a fertile ground for designing miniaturized portable sensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> GASI generates micro-vortex resulting in enhanced capture of BPA and subsequently enhanced sensitivity of the aptasensor. </LI> <LI> The aptasensor has low LOD, wide linear dynamic range and good response time compared to conventional aptasensors. </LI> </UL> </P>
Marandi, Aref Kashefi,Shojaiefard, Abolfazl,Soroush, Ahmadreza,Abdegah, Ali Ghorbani,Jafari, Mehdi,Khodadost, Mahmoud,Mahmoudzade, Hossein Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup3
Gastroesophageal cancer is one of the most common types of cancer worldwide. Despite significant developments in management, 5-year survival in the developing world is less than 20 percent. Due to restricted research about the impact of preoperative chemotherapy (POC) on tumor resection, pathological response and postoperative complications in Iran, we designed and implemented the present retrospective cross- sectional study on 156 patients with gastroesophageal cancer (GEc) between 2013 and 2015 at Shariati Hospital of Tehran. Two groups were included, the first group had previously received preoperative chemotherapy and the second group had only undergone surgery. All patients were followed for at least one year after the operation in terms of tumor recurrence, relapse free survival and one-year survival. The two groups were eventually compared regarding tumor resection, pathological response, postoperative complications, recurrence rate and survival. The mean age was $66.5{\pm}7.3years$ and 78 percent were male. The tumor resectability, pathological response and postoperative complications in the group which received POC were 93.5%, 21.8% and 12.8%, respectively, and in the surgery alone group figures for tumor resection and postoperative complications were 76% and 29.5%, respectively. Also based on our study the 5-year survival in the POC group was better (79.5% vs. 66.5%). Using standard neoadjuvant regimens (preoperative chemotherapy/chemoradiotherapy) beforesurgery could increase tumor resectability, pathological response, and improve the general status of the patients. Therefore using POC may be recommended over surgery alone.
Potentials of porous materials for energy management in heat exchangers – A comprehensive review
Rashidi, Saman,Kashefi, Mohammad Hossein,Kim, Kyung Chun,Samimi-Abianeh, Omid ELSEVIER 2019 APPLIED ENERGY -BARKING THEN OXFORD- Vol.243 No.-
<P><B>Abstract</B></P> <P>Heat exchangers are recognized as popular thermal devices with various and important applications in industrial energy systems. Many techniques were employed in order to manage the energy in these devices. Among these techniques, porous materials with high potentials for the energy management and enhancing the thermal performances in heat exchangers were employed widely. This paper reviews recent developments and utilisation of different types of porous materials in the heat exchangers. Both simulation and experimental works were briefly explained. The gaps in current literatures and designs were investigated and solutions for them were discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Potentials of porous materials in the heat exchangers are reviewed in this paper. </LI> <LI> Both simulation and experimental works are briefly explained. </LI> <LI> Gaps in current literatures are investigated and solutions for them are discussed. </LI> <LI> Porous media with larger porosity and conductivity are proper for heat exchangers. </LI> <LI> Fouling in porous materials can provide some negative effects in heat exchangers. </LI> </UL> </P>
A Novel Similarity Measure for Sequence Data
Pandi, Mohammad. H.,Kashefi, Omid,Minaei, Behrouz Korea Information Processing Society 2011 Journal of information processing systems Vol.7 No.3
A variety of different metrics has been introduced to measure the similarity of two given sequences. These widely used metrics are ranging from spell correctors and categorizers to new sequence mining applications. Different metrics consider different aspects of sequences, but the essence of any sequence is extracted from the ordering of its elements. In this paper, we propose a novel sequence similarity measure that is based on all ordered pairs of one sequence and where a Hasse diagram is built in the other sequence. In contrast with existing approaches, the idea behind the proposed sequence similarity metric is to extract all ordering features to capture sequence properties. We designed a clustering problem to evaluate our sequence similarity metric. Experimental results showed the superiority of our proposed sequence similarity metric in maximizing the purity of clustering compared to metrics such as d2, Smith-Waterman, Levenshtein, and Needleman-Wunsch. The limitation of those methods originates from some neglected sequence features, which are considered in our proposed sequence similarity metric.
A new polymeric additive as asphaltene deposition inhibitor in CO2 core flooding
Mohammad Nader Lotfollahi,Sepideh Kashefi,Abbas Shahrabadi,Akbar Varamesh 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
A new synthesized polymeric inhibitor (SPI) based on the poly-alkyl phenol formaldehyde and polyamine was introduced as asphaltene deposition inhibitor. A Turbiscan apparatus was used to investigate the stability of precipitated asphaltene in crude oil solutions by adding different concentrations of the SPI. The results of turbidity showed that the SPI could delay the asphaltene deposition and provide high stability of precipitated asphaltene in oil solutions. Then two dynamic experiments, including co-injection of crude oil and CO2 into a sandstone core, were conducted with and without the use of 500mg/L SPI at 173 bar and 50 oC. The permeability ratio and asphaltene content remained relatively unchanged throughout the core flooding with the use of SPI, which indicated increase of the asphaltene stability in the core sample. However, the permeability ratio and outlet asphaltene content in dynamic experiment without the use of SPI decreased by about 70% and 51%, respectively.
A Novel Similarity Measure for Sequence Data
( Mohammad. H. Pandi ),( Omid Kashefi ),( Behrouzminaei ) 한국정보처리학회 2011 Journal of information processing systems Vol.7 No.3
A variety of different metrics has been introduced to measure the similarity of two given sequences. These widely used metrics are ranging from spell correctors and categorizers to new sequence mining applications. Different metrics consider different aspects of sequences, but the essence of any sequence is extracted from the ordering of its elements. In this paper, we propose a novel sequence similarity measure that is based on all ordered pairs of one sequence and where a Hasse diagram is built in the other sequence. In contrast with existing approaches, the idea behind the proposed sequence similarity metric is to extract all ordering features to capture sequence properties. We designed a clustering problem to evaluate our sequence similarity metric. Experimental results showed the superiority of our proposed sequence similarity metric in maximizing the purity of clustering compared to metrics such as d2, Smith-Waterman, Levenshtein, and Needleman-Wunsch. The limitation of those methods originates from some neglected sequence features, which are considered in our proposed sequence similarity metric.