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Graniel Harne A. Abrenica,Joey D. Ocon,이재영 한국물리학회 2016 Current Applied Physics Vol.16 No.9
Multi-electron reaction anodes have been exciting battery materials due to their exceptionally high energy densities. Herein, nanostructured iron borides (nanoFeB) have been synthesized via dip-coating chemical reduction in conjunction with a heat treatment procedure and were directly used as anodes in a metal/metalloid-air battery. The crystal structure, particle size, BET surface area, and electrochemical properties of iron boride samples treated at four different temperature conditions (200 C, 300 C, 400 C, and 500 C) were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2 adsorptiondesorption isotherms, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The nanoFeB heat-treated at 300 C (nanoFeB300) exhibits the highest surface area among reported values in literature and demonstrates excellent anode discharge performance in a metal/metalloid-air battery.
Abrenica, Graniel Harne A.,Ocon, Joey D.,Lee, Jaeyoung Elsevier 2016 CURRENT APPLIED PHYSICS Vol.16 No.9
<P>Multi-electron reaction anodes have been exciting battery materials due to their exceptionally high energy densities. Herein, nanostructured iron borides (nanoFeB) have been synthesized via dip-coating chemical reduction in conjunction with a heat treatment procedure and were directly used as anodes in a metal/metalloid-air battery. The crystal structure, particle size, BET surface area, and electrochemical properties of iron boride samples treated at four different temperature conditions (200 degrees C, 300 degrees C, 400 degrees C, and 500 degrees C) were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N-2 adsorption-desorption isotherms, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The nanoFeB heat-treated at 300 degrees C (nanoFeB(300)) exhibits the highest surface area among reported values in literature and demonstrates excellent anode discharge performance in a metal/metalloid-air battery. (C) 2016 Elsevier B.V. All rights reserved.</P>
Lonkar, P.,Harne, S.D.,Kalorey, D.R.,Kurkure, N.V. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.9
The present research work was conducted to evaluate the beneficial effects as well as the safety aspects of lactobacilli as probiotic. Lactobacilli were isolated from poultry faecal samples, feed samples and from some known preparations procured from poultry feed manufacturers. L. acidophilus and L. sporogenes were tested for the antibacterial activity against four poultry pathogens viz. Escherichia coli, Salmonella spp., Proteus spp. and Pseudomonas aeruginosa. Cell free supernatant (CFS) of L. acidophilus exhibited significantly higher antibacterial activity against Salmonella spp. at original pH (4.50${\pm}$0.02). At the adjusted pH (6.50${\pm}$0.02) significantly higher antibacterial activity was recorded against indicator organism except for P. aeruginosa. Likewise, L. sporogenes exhibited similar antibacterial activity at original as well as adjusted pH except for E. coli. Antibacterial activity against E. coli was significantly higher at adjusted pH than at original pH of CFS. The competitive exclusion of E. coli by lactobacilli over the intestinal epithelial cells (IEC) was checked. L. acidophilus strain I, which was of poultry origin, exhibited maximum attachment over IEC as compared to other three strains of non-poultry origin viz. L. acidophilus strain II, L. sporogenes strain I and II. Overall, L. acidophilus exhibited higher competitive exclusion as compared to L. sporogenes. All the lactobacilli of poultry origin were most sensitive to penicillin G, amoxycillin, ampicillin and chloramphenicol, least sensitive to sulphamethizole, ciprofloxacin, neomycin, norfloxacin and pefloxacin and resistant to metronidazole and nalidixic acid. The isolates from probiotic preparations were most sensitive to ampicillin, amoxycillin and tetracycline, least sensitive to sulphamethizole, norfloxacin, neomycin and ceftriazone and resistant to nalidixic acid and metronidazole. Eight of the multiple drug resistant lactobacilli isolates were studied for the presence of plasmids. Plasmids could be extracted from six isolates of lactobacilli. These plasmids could be responsible for bacteriocin production or for antibiotic resistance of the strains. The lactobacilli need further studies regarding their safety for use in the probiotic preparations.
Chronic kisspeptin delays puberty and reduces feed intake and body weight in female rats
Sathagopam, Sriravali,Ullewar, Meenal Prabhakar,Harne, Rakhi,Velmurugan, Sathya The Korean Society of Animal Reproduction and Biot 2021 한국동물생명공학회지 Vol.36 No.1
Kisspeptin is a key player in the central control of reproductive axis. Central administration of kisspeptin has been shown to advance puberty in rats. Stimulation of hypothalamic GnRH pulse generating mechanism by kisspeptin has been proposed to be the mechanism behind the onset of puberty. We hypothesized that chronic high doses of kisspeptin administration suppresses the reproductive axis and hence delays the pubertal onset. Hence, we investigated the effect of peripheral administration of chronic high doses of kisspeptin on pubertal onset, feed intake and body weight in female rats. Rats were treated with saline or kisspeptin (100 nmoles per day; intraperitoneal) for 26 days (day 25 to day 50 postnatal) and the day of vaginal opening was marked as day of puberty. Kisspeptin treated rats had delayed pubertal onset and reduced feed intake and body weight. Gonadal GPR54 mRNA was reduced suggesting that chronic high doses of kisspeptin may suppress the reproductive functions possibly by downregulation of GPR54 receptor. However, delay in puberty due to reduction in feed intake and body weight could not be ruled out in this study. Further, our study emphasizes the importance of dosage and duration of kisspeptin administration in the manipulation of reproductive axis. Our study, for the first time, suggests that kisspeptin and its analogues, if proven beneficial, could be used to treat precocious puberty in children. It appears that, though a promising tool for enhancing fertility, kisspeptin acts as a double-edged sword and has to be cautiously used to manipulate reproduction.
Chronic kisspeptin delays puberty and reduces feed intake and body weight in female rats
Sriravali Sathagopam,Meenal Prabhakar Ullewar,Rakhi Harne,Sathya Velmurugan 한국동물생명공학회(구 한국동물번식학회) 2021 Journal of Animal Reproduction and Biotechnology Vol.36 No.1
Kisspeptin is a key player in the central control of reproductive axis. Central administration of kisspeptin has been shown to advance puberty in rats. Stimulation of hypothalamic GnRH pulse generating mechanism by kisspeptin has been proposed to be the mechanism behind the onset of puberty. We hypothesized that chronic high doses of kisspeptin administration suppresses the reproductive axis and hence delays the pubertal onset. Hence, we investigated the effect of peripheral administration of chronic high doses of kisspeptin on pubertal onset, feed intake and body weight in female rats. Rats were treated with saline or kisspeptin (100 nmoles per day; intraperitoneal) for 26 days (day 25 to day 50 postnatal) and the day of vaginal opening was marked as day of puberty. Kisspeptin treated rats had delayed pubertal onset and reduced feed intake and body weight. Gonadal GPR54 mRNA was reduced suggesting that chronic high doses of kisspeptin may suppress the reproductive functions possibly by downregulation of GPR54 receptor. However, delay in puberty due to reduction in feed intake and body weight could not be ruled out in this study. Further, our study emphasizes the importance of dosage and duration of kisspeptin administration in the manipulation of reproductive axis. Our study, for the first time, suggests that kisspeptin and its analogues, if proven beneficial, could be used to treat precocious puberty in children. It appears that, though a promising tool for enhancing fertility, kisspeptin acts as a double-edged sword and has to be cautiously used to manipulate reproduction.
Park, Dong-Won,Kim, Soeun,Ocon, Joey D.,Abrenica, Graniel Harne A.,Lee, Jae Kwang,Lee, Jaeyoung American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.5
<P>We report the fabrication of nanoporous silicon (nPSi) electrodes via electrochemical etching to form a porous Si layer with controllable thickness and pore size. Varying the etching time and ethanolic HF concentration results in different surface morphologies, with various degrees of electrolyte access depending on the pore characteristics. Optimizing the etching condition leads to well-developed nPSi electrodes, which have thick porous layers and smaller pore diameter and exhibit improved discharge behavior as anodes in alkaline Siair cells in contrast to flat Si anode. Although electrochemical etching is effective in improving the interfacial characteristics of Si in terms of high surface area, we observed that mild anodization occurs and produces an oxide overlayer. We then show that this oxide layer in nPSi anodes can be effectively removed to produce an nPSi anode with good discharge behavior in an actual alkaline Siair cell. In the future, the combination of high surface area nPSi anodes with nonaqueous electrolytes (e.g., room-temperature ionic liquid electrolyte) to minimize the strong passivation behavior and self-discharge in Si could lead to Si-air cells with a stable voltage profile and high anode utilization.</P>
Quasi-perpetual discharge behaviour in p-type Ge–air batteries
Ocon, Joey D.,Kim, Jin Won,Abrenica, Graniel Harne A.,Lee, Jae Kwang,Lee, Jaeyoung The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.41
<P>Metal–air batteries continue to become attractive energy storage and conversion systems due to their high energy and power densities, safer chemistries, and economic viability. Semiconductor–air batteries – a term we first define here as metal–air batteries that use semiconductor anodes such as silicon (Si) and germanium (Ge) – have been introduced in recent years as new high-energy battery chemistries. In this paper, we describe the excellent doping-dependent discharge kinetics of p-type Ge anodes in a semiconductor–air cell employing a gelled KOH electrolyte. Owing to its Fermi level, n-type Ge is expected to have lower redox potential and better electronic conductivity, which could potentially lead to a higher operating voltage and better discharge kinetics. Nonetheless, discharge measurements demonstrated that this prediction is only valid at the low current regime and breaks down at the high current density region. The p-type Ge behaves extremely better at elevated currents, evident from the higher voltage, more power available, and larger practical energy density from a very long discharge time, possibly arising from the high overpotential for surface passivation. A primary semiconductor–air battery, powered by a flat p-type Ge as a multi-electron anode, exhibited an unprecedented full discharge capacity of 1302.5 mA h g<SUB>Ge</SUB><SUP>−1</SUP> (88% anode utilization efficiency), the highest among semiconductor–air cells, notably better than new metal–air cells with three-dimensional and nanostructured anodes, and at least two folds higher than commercial Zn–air and Al–air cells. We therefore suggest that this study be extended to doped-Si anodes, in order to pave the way for a deeper understanding on the discharge phenomena in alkaline metal–air conversion cells with semiconductor anodes for specific niche applications in the future.</P> <P>Graphic Abstract</P><P>A semiconductor–air battery, powered by a flat p-type Ge anode, exhibits an unprecedented full discharge energy capacity and anode utilization efficiency relative to commercial metal–air batteries, and new metal–air batteries using 3D, nanostructured, and porous metal anodes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp02134g'> </P>