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Chacon-Heszele, Maria F.,Zuo, Xiaofeng,Hellman, Nathan E.,McKenna, Sarah,Choi, Soo Young,Huang, Liwei,Tobias, John W.,Park, Kwon Moo,Lipschutz, Joshua H. American Physiological Society 2014 American Journal of Physiology Vol.306 No.9
<P>Cystogenesis and tubulogenesis are basic building blocks for many epithelial organs, including the kidney. Most researchers have used two-dimensional (2D) cell culture to investigate signaling pathways downstream of hepatocyte growth factor (HGF). We hypothesize that three-dimensional (3D) collagen-grown Madin-Darby canine kidney (MDCK) cells, which form cysts and then tubulate in response to HGF, are a much more in vivo-like system for the identification of novel tubulogenes. With the use of a canine microarray containing over 20,000 genes, 2,417 genes were identified as potential tubulogenes that were differentially regulated, exclusively in 3D-grown MDCK cells. Among these, 840 were dependent on MAPK signaling. Importantly, this work shows that many putative tubulogenes, previously identified via microarray analysis of 2D cultures, including by us, do not change in 3D culture and vice versa. The use of a 3D-culture system allowed for the identification of novel MAPK-dependent and -independent genes that regulate early renal tubulogenesis in vitro, e.g., matrix metalloproteinase 1 (MMP1). Knockdown of MMP1 led to defects in cystogenesis and tubulogenesis in 3D-grown MDCK cells, most likely due to problems establishing normal polarity. We suggest that data obtained from 2D cultures, even those using MDCK cells treated with HGF, should not be automatically extrapolated to factors important for cystogenesis and tubulogenesis. Instead, 3D culture, which more closely replicates the biological environment and is therefore a more accurate model for identifying tubulogenes, is preferred. Results from the present analysis will be used to build a more accurate model of the signaling pathways that control cystogenesis and tubulogenesis.</P>
Bruno Garcia Vasconcelos,Rafael Chacon Ruiz Martinez,Inar Alves de Castro,Susana Marta Isay Saad 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.6
Acceptance and the probiotic viability of aninnovative non-dairy frozen açaí (Euterpe oleracea, Mart.)dessert supplemented and not supplemented with inulinduring a shelf-life of 84 days at −18oC were investigated. Desserts containing and not containing probiotic Lactobacillusacidophilus La-5 and Bifidobacterium animalis Bb-12 andinulin were produced, resulting in 4 mixes of frozen açaí:control (M1), pro (M2), pre (M3), and synbiotic (M4). Sensory acceptability scores and probiotic counts wereobtained during 84 days of storage. Inulin, a key factor forproduct approval, significantly (p<0.05) increased overallproduct acceptance of both M3 and M4, compared withM1. La-5 viability was above 7 log CFU/g for both pro andsynbiotic desserts. Bb-12 counts were above 6 log CFU/gonly for M4. All frozen açaí desserts were suitable forprobiotic delivery and were accepted by consumers. Addition of inulin is recommended both for increasingacceptance and for the synbiotic potential.
Isolation and Molecular Characterization of Xylella fastidiosa from Coffee Plants in Costa Rica
Mauricio Montero-Astua,Carlos Chacon-Diaz,Estela Aguilar,Carlos Mario Rodriguez,Laura Garita,William Villalobos,Lisela Moreira,John S. Hartung,Carmen Rivera 한국미생물학회 2008 The journal of microbiology Vol.46 No.5
Coffee plants exhibiting a range of symptoms including mild to severe curling of leaf margins, chlorosis and deformation of leaves, stunting of plants, shortening of internodes, and dieback of branches have been reported since 1995 in several regions of Costa Rica’s Central Valley. The symptoms are referred to by coffee producers in Costa Rica as “crespera” disease and have been associated with the presence of the bacterium Xylella fastidiosa. Coffee plants determined to be infected by the bacterium by enzyme linked immunosorbent assay (ELISA), were used for both transmission electron microscopy (TEM) and for isolation of the bacterium in PW broth or agar. Petioles examined by TEM contained rod-shaped bacteria inside the xylem vessels. The bacteria measured 0.3 to 0.5 μm in width and 1.5 to 3.0 μm in length, and had rippled cell walls 10 to 40 nm in thickness, typical of X. fastidiosa. Small, circular, dome-shaped colonies were observed 7 to 26 days after plating of plant extracts on PW agar. The colonies were comprised of Gram-negative rods of variable length and a characteristic slight longitudinal bending. TEM of the isolated bacteria showed characteristic rippled cell walls, similar to those observed in plant tissue. ELISA and PCR with specific primer pairs 272-1-int/272-2-int and RST31/RST33 confirmed the identity of the isolated bacteria as X. fastidiosa. RFLP analysis of the amplification products revealed diversity within X. fastidiosa strains from Costa Rica and suggest closer genetic proximity to strains from the United States of America than to other coffee or citrus strains from Brazil.
Novel tailoring algorithm for abrupt motion artifact removal in photoplethysmogram signals
Limeng Pu,Pedro J. Chacon,Hsiao-Chun Wu,최진우 대한의용생체공학회 2017 Biomedical Engineering Letters (BMEL) Vol.7 No.4
Photoplethysmogram (PPG) signals are widelyused for wearable electronic devices nowadays. The PPGsignal is extremely sensitive to the motion artifacts (MAs)caused by the subject’s movement. The detection andremoval of such MAs remains a difficult problem. Due tothe complicated MA signal waveforms, none of the existingtechniques can lead to satisfactory results. In this paper,a new framework to identify and tailor the abrupt MAs inPPG is proposed, which consists of feature extraction,change-point detection, and MA removal. In order toachieve the optimal performance, a data-dependent framesizedetermination mechanism is employed. Experimentsfor the heart-beat-rate-measurement application have beenconducted to demonstrate the effectiveness of our proposedmethod, by a correct detection rate of MAs at 98% and theaverage heart-beat-rate tracking accuracy above 97%. Onthe other hand, this new framework maintains the originalsignal temporal structure unlike the spectrum-basedapproach, and it can be further applied for the calculationof blood oxygen level (SpO2).
Silva-Martin, N.,Bartual, Sergio G.,Ramirez-Aportela, E.,Chacon, P.,Park, C.,Hermoso, Juan A. Current Biology 2014 Structure Vol.22 No.11
SIGN-R1 is a principal receptor for microbial polysaccharides uptake and is responsible for C3 fixation via an unusual complement activation pathway on splenic marginal zone macrophages. In these macrophages, SIGN-R1 is also involved in anti-inflammatory activity of intravenous immunoglobulin by direct interaction with sialylated Fcs. The high-resolution crystal structures of SIGN-R1 carbohydrate recognition domain and its complexes with dextran sulfate or sialic acid, and of the sialylated Fc antibody provide insights into SIGN-R1's selective recognition of α-2,6-sialylated glycoproteins. Unexpectedly, an additional binding site has been found in the SIGN-R1 carbohydrate recognition domain, structurally separate from the calcium-dependent carbohydrate-binding site. This secondary binding site could bind repetitive molecular patterns, as observed in microbial polysaccharides, in a calcium-independent manner. These two binding sites may allow SIGN-R1 to simultaneously bind both immune glycoproteins and microbial polysaccharide components, accommodating SIGN-R1's ability to relate the recognition of microbes to the activation of the classical complement pathway.
[‘코스타리카 지식다이얼로그 국제세미나’] 한-코스타리카 도시, 환경 및 에너지 분야 지식공유를 통한 협력기반 구축
서병권(편집자),로라 리자노(Laura Lizano),안지운,구자춘,아드리아나 샤콘 까스칸테(Adriana Chacon-Cascante),로센도 메사예스 푸홀(Rosendo Mesalles Pujol),민성희,레오나르도 메리노 트레호스(Leonardo Merino Trejos),이스마엘 마일리 곤잘레스(토론자),정일호(토론자),김동주(토론자) 국토연구원 2016 국토 : planning and policy Vol.413 No.-
M. Cortez-Valadez,L. P. Ramírez-Rodríguez,J.-G. Bocarando-Chacon,M. FLORES-ACOSTA,S. VELUMANI,R. Ramírez-Bon 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.7
"Cadmium colloidal crystalline nanoparticles were obtained by a simple green synthesis method employing the plant extract of Opuntia ficus-indica. The plant extract reduces the Cd ions and stabilizes the size of cadmium colloidal particles at the nanometric level. The size and morphology of agglomerates of nanoparticles of about 100 nm were analyzed by field-emission scanning electron microscopy (FESEM). The size, shape and crystalline structure of the Cd nanoparticles were determined from TEM analysis. The results show that Cd nanoparticles with hexagonal crystalline structure and average size 2–3 nm were obtained by this green synthesis method. The optical absorption spectrum of the colloidal solution containing the cadmium nanoparticles displays an optical absorption band centered at 236 nm, which was attributed to the plasmon resonance of the Cd colloidal nanoparticles. Mie theory for colloidal systems was applied to reproduce theoretically the plasmon resonance absorption data of the Cd colloidal nanoparticles. Furthermore, the Raman spectrum of powder from dried samples after reduction of cadmium ions, displays a low wavenumber vibration mode centered at 114 cm-1, assigned to the Cd nanoparticles. Density functional theory (DFT) calculations at local spin density approximation (LSDA) level were performed to determine the structure and vibrational properties of small clusters of cadmium consisting of 3–10 atoms. Radial breathing modes with frequencies between 90 cm-1 and 120 cm-1 were found to be the most active Raman modes of the low-energy Cdn clusters."
Cell-Assisted Lipotransfer for the Treatment of Parry-Romberg Syndrome
Castro-Govea, Yanko,De La Garza-Pineda, Oscar,Lara-Arias, Jorge,Chacon-Martinez, Hernan,Mecott-Rivera, Gabriel,Salazar-Lozano, Abel,Valdes-Flores, Everardo Korean Society of Plastic and Reconstructive Surge 2012 Archives of Plastic Surgery Vol.39 No.6
Progressive facial hemiatrophy, also known as Parry-Romberg syndrome, is a progressive and self-limited deformation of the subcutaneous tissue volume on one side of the face that creates craniofacial asymmetry. We present the case of a patient with a five-year history of progressive right facial hemiatrophy, who underwent facial volumetric restoration using cell-assisted lipotransfer (CAL), which consists of an autologous fat graft enriched with adipose-derived stem cells (ASCs) extracted from the same patient. ASCs have the capacity to differentiate into adipocytes. They also promote angiogenesis, release angiogenic growth factors, and some can survive as stem cells. The use of autologous fat as a filler in soft tissue atrophy has been satisfactory in patients with mild and moderate Parry-Romberg syndrome. Currently, CAL has showed promising results in the long term by decreasing the rate of fat reabsorption. The permanence and stability of the graft in all the injected areas has showed that autologous fat grafts enriched with stem cells could be a promising technique for the correction of defects caused by this syndrome.
L. P. RAMÍREZ-RODRÍGUEZ,M. CORTEZ-VALADEZ,H. ARIZPE-CH AVEZ,J.-G. BOCARANDO-CHACON,R. RAMÍREZ-BON,S. VELUMANI,M. FLORES-ACOSTA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Colloidal nanoparticles were obtained by green synthesis, embedded in the Opuntia ¯cus-indicaplant extract. Optical measurements allowed us to detect two absorption bands centered in230 nm and 298 nm. Agglomerates of Pb nanoparticles have size in the range 2 – 8 nm. The ef-fective absorption cross section of spherical Pb nanoparticles was calculated by applying the Mietheory for colloidal systems and compared to optical absorption measurements of Pb nano-particles. The Raman spectrum of the samples after the reduction of Pb, shows a band at lowwavenumbers centered at 116 cm? 1 . Similar bands have been assigned to small Pb and Agclusters in other experimental results. Additionally, we used the density functional theory (DFT)as well as semi-empirical methods to assign this band to radial breathing modes of Pb metalnanoparticles.