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1.
Mol Biol Evol ; 41(7)2024 Jul 03.
Artículo en Inglés | MEDLINE | ID: mdl-38842255

RESUMEN

The origins and extreme morphological evolution of the modern dog breeds are poorly studied because the founder populations are extinct. Here, we analyse eight 100 to 200 years old dog fur samples obtained from traditional North Swedish clothing, to explore the origin and artificial selection of the modern Nordic Lapphund and Elkhound dog breeds. Population genomic analysis confirmed the Lapphund and Elkhound breeds to originate from the local dog population, and showed a distinct decrease in genetic diversity in agreement with intense breeding. We identified eleven genes under positive selection during the breed development. In particular, the MSRB3 gene, associated with breed-related ear morphology, was selected in all Lapphund and Elkhound breeds, and functional assays showed that a SNP mutation in the 3'UTR region suppresses its expression through miRNA regulation. Our findings demonstrate analysis of near-modern dog artifacts as an effective tool for interpreting the origin and artificial selection of the modern dog breeds.


Asunto(s)
Pelaje de Animal , Selección Genética , Animales , Perros/genética , Polimorfismo de Nucleótido Simple , Cruzamiento , Suecia , Variación Genética , MicroARNs/genética
2.
Yi Chuan ; 44(5): 362-369, 2022 May 20.
Artículo en Inglés | MEDLINE | ID: mdl-35729694

RESUMEN

Recent success in the retrieval of nuclear DNA of ancient humans and animals from cave sediments paves the way for genome-wide studies of past populations directly from sediments. In three studies, nuclear genomes of different species were obtained from the sediments of multiple archeological caves and their genetic histories were revealed, including an unknown population replacement of Neanderthals from Estatuas cave in Spain, which was recovered using a new DNA capture approach. By extending sediments as a source of DNA beyond fossils, this breakthrough is of particular significance to the field of ancient human genomics, which brings about more possibilities for exploring the history of past population migration, evolution and adaptation within larger time-scales and geographical areas where no fossil remains exist. Here, we mainly review the significance of the technical advances in retrieving ancient nuclear DNA from sediments and present new insights into the genetic history of Neanderthals revealed by this technique. By combining ancient genomes retrieved from fossils and additional mitochondrial DNA extracted from sediments of archaeological sites, we may begin investigating diverse archaic populations and examine their genetic relationships, movements and replacements in detail.


Asunto(s)
Hominidae , Hombre de Neandertal , Animales , ADN Antiguo , ADN Mitocondrial/genética , Genoma Humano , Hominidae/genética , Humanos , Hombre de Neandertal/genética
3.
Yi Chuan ; 44(5): 414-423, 2022 May 20.
Artículo en Inglés | MEDLINE | ID: mdl-35729698

RESUMEN

Fermentation production is the most primitive application of microorganisms by humans, which is of great significance in human history. However, due to the lack of molecular evidence, the history of human fermentation production and the evolution and domestication of fermentation microorganisms remain to be further investigated. Taking wine and fermented dairy, the two most common types of fermented foods as examples, we introduce the archaeology evidence of fermented foods and the evolution and domestication of fermented microorganisms, introduce the research status of paleomicrobiology and fermented paleomicroorganisms, and explore the feasibility and challenges of the research of ancient fermented microorganisms applying microbial ancient DNA technology, as well as the application potential of ancient DNA capture technology in this field.


Asunto(s)
ADN Antiguo , Alimentos Fermentados , Domesticación , Fermentación , Humanos , Tecnología
4.
Biochem Cell Biol ; 97(6): 702-708, 2019 12.
Artículo en Inglés | MEDLINE | ID: mdl-31770017

RESUMEN

Hemorrhagic transformation (HT) is a devastating complication for patients with acute ischemic stroke (AIS) who are treated with tissue plasminogen activator (tPA). HT is associated with high morbidity and mortality, but no effective treatments are currently available to reduce the risk of HT. Therefore, methods to prevent HT are urgently needed. In this study, we used IM-12, an inhibitor of glycogen synthase kinase 3ß (GSK-3ß), to evaluate the role of the Wnt-ß-catenin signaling pathway in recombinant tPA (rtPA)-induced HT. Sprague-Dawley rats were subjected to a middle cerebral artery occlusion (MCAO) model of ischemic stroke, and then were either administered rtPA, rtPA combined with IM-12, or the vehicle at 4 h after stroke was induced. Our results indicate that rats subjected to HT had more severe neurological deficits, brain edema, and blood-brain barrier (BBB) breakdown, and had a greater infarction volume than the control group. Rats treated with IM-12 had improved outcomes compared with those of rats treated with rtPA alone. Moreover, IM-12 increased the protein expression of ß-catenin and downstream proteins while suppressing the expression of GSK-3ß. These results suggest that IM-12 reduces rtPA-induced HT and attenuates BBB disruption, possibly through activation of the Wnt-ß-catenin signaling pathway, and provides a potential therapeutic strategy for preventing tPA-induced HT after AIS.


Asunto(s)
Hemorragia/tratamiento farmacológico , Indoles/farmacología , Maleimidas/farmacología , Accidente Cerebrovascular/tratamiento farmacológico , Activador de Tejido Plasminógeno/antagonistas & inhibidores , Vía de Señalización Wnt/efectos de los fármacos , Animales , Hemorragia/metabolismo , Masculino , Ratas , Ratas Sprague-Dawley , Accidente Cerebrovascular/metabolismo , Activador de Tejido Plasminógeno/farmacología
5.
Rev Med Suisse ; 14(602): 784-790, 2018 Apr 11.
Artículo en Francés | MEDLINE | ID: mdl-29658218

RESUMEN

There is little evidence on healthcare-associated infections in outpatient care. The Swiss Federal Office for Public Health commissioned a systematic review to estimate the incidence of healthcare-associated infections in non-institutional settings. A total of 126 papers were eligible for data abstraction. The identified reports and studies were heterogeneous and generally of low quality. The main outcomes were surgical site infections, central venous catheter-related bloodstream infections, and urinary tract infections. While no comparison to inpatients was possible for surgical site infection, the incidence of urinary tract infection and central venous catheter-related bloodstream infection in haemodialysis and home intravenous therapy was similar to the incidence of these infections observed in acute care settings.


Il existe peu d'évidence concernant les infections associées aux soins (IAS) en pratique ambulatoire. Nous avons conduit une revue systématique visant à déterminer l'incidence des IAS acquises dans le cadre de la pratique ambulatoire sous mandat de l'OFSP. Au total, 126 articles, globalement hétérogènes et de faible qualité, ont été identifiés. Les résultats les plus fréquemment rapportés sont les infections du site chirurgical, les bactériémies et les infections urinaires. Alors qu'aucune comparaison n'est possible entre les taux d'infections du site chirurgical en cas d'hospitalisation ou de pratique ambulatoire, l'incidence des bactériémies en hémodialyse et des suites de la pratique des soins à domicile ainsi que les infections urinaires est du même ordre de grandeur en pratique ambulatoire qu'au cours des soins en milieu hospitalier.

6.
Zhongguo Zhong Yao Za Zhi ; 42(22): 4353-4357, 2017 Nov.
Artículo en Zh | MEDLINE | ID: mdl-29318834

RESUMEN

Due to the particularity of ginseng cultivation, the soil fertility of cultivated ginseng is seriously depleted, so that the cultivated ginseng land can not be reused in the short term, and the land area available for cultivating ginseng becomes less and less with the growth of ginseng cultivation time. Therefore, in order to effectively manage ginseng cultivation, and achieve the sustainable use of ginseng land, it is necessary to obtain accurate information on the distribution of ginseng planting space. In this study, the object-oriented classification method based on rule set was used to extract ginseng planting area based on the ZY-3 satellite data in Fusong county, Jilin province. Firstly, multi-scale segmentation of ZY-3 remote sensing image in the study area was made, and the optimal segmentation scale was determined on the basis of multi-scale segmentation results. Secondly, a spectral curve according to the different feature type samples was generated. The similarities and differences between ginseng plot and other types of surface features were analyzed, and a rule set based on the results of spectral analysis was established to achieve the final extraction. The results show that the object-oriented classification method based on rule set can effectively extract the ginseng planting plots in the study area, and solve the problem that the extraction result is broken compared with the traditional pixel-based classification method.


Asunto(s)
Agricultura , Panax/crecimiento & desarrollo , Plantas Medicinales/crecimiento & desarrollo , China , Suelo
7.
Biotechnol Lett ; 37(5): 1049-55, 2015 May.
Artículo en Inglés | MEDLINE | ID: mdl-25637590

RESUMEN

Salinispora arenicola CNS-205 was a first-isolated obligate marine actinomycete. A gene (sare0357), annotated as ''amino acid adenylation domain'' located on the genome of Salinispora arenicola CNS-205, was cloned and characterized. The recombinant target protein Sare0357 was expressed in E. coli. Sare0357 specifically recognized and activated tryptophan (Trp) and phenylalanine (Phe). The basic kinetic parameters of Sare0357 for Trp were K m = 0.04 mM, V max = 2.1 µM/min, k cat = 14.2 min(-1), and for Phe were K m = 0.03 mM, V max = 1.6 µM/min, kcat = 10.4 min(-1). Our data elucidated Sare0357 biological role and biochemical properties as a Trp and Phe-activating adenylation domain.


Asunto(s)
Micromonosporaceae/enzimología , Péptido Sintasas/metabolismo , Organismos Acuáticos/enzimología , Organismos Acuáticos/aislamiento & purificación , Clonación Molecular , Escherichia coli/genética , Escherichia coli/metabolismo , Expresión Génica , Cinética , Micromonosporaceae/aislamiento & purificación , Péptido Sintasas/química , Péptido Sintasas/genética , Fenilalanina/metabolismo , Especificidad por Sustrato , Triptófano/metabolismo
8.
Guang Pu Xue Yu Guang Pu Fen Xi ; 34(9): 2476-80, 2014 Sep.
Artículo en Zh | MEDLINE | ID: mdl-25532348

RESUMEN

A field calibration campaign of ZY-3 multispectral sensor (MUS) was performed by the China Center for Resources Satellite Data and Application at the Dunhuang site. The reflectance-based method with two-point sites was used to obtain MUS absolute calibration coefficients in 2013. Compared to the calibration results in 2012, the calibration coefficients in 2013 changed by about 1%-8.5% in different bands. The results were also validated by intercalibration method using the Landsat 8 Operational Land Imager (OLI) data. It shows largely good consistency between field calibration and intercalibration. It was concluded that the absolute calibration coefficients were highly reliable.

9.
Guang Pu Xue Yu Guang Pu Fen Xi ; 34(8): 2212-7, 2014 Aug.
Artículo en Zh | MEDLINE | ID: mdl-25474964

RESUMEN

Since HJ-1B was launched, 7 sets of blackbody data have been used to calculate onboard calibration coefficients, but the research work on the validation of coefficients is rare. According to the onboard calibration principle, calibration coefficients of HJ-1B thermal infrared channel on Sep 14th, 2009 were calculated with the half-width, moments and look-up table methods. MODIS was selected for the reference sensor, and algorithms of spectral match were improved between the HJ-1B thermal infrared channel and MODIS 31, 32 channels based on the spectral response divergence. The relationship of top of atmosphere (TOA) radiance between the remote sensors was calculated, based on which the surface leaving brightness temperature was calculated by Planck function to validate the brightness temperature calculated through the onboard calibration coefficients. The equivalent brightness temperature calculated by spectral response divergence method is 285.97 K, and the inversion brightness temperature calculated by half-width, moments and look-up table methods is 288.77, 274.52 and 285.97 K respectively. The difference between the inversion brightness temperature and the equivalent brightness temperature is 2.8, -11.46 and 0.02 K, respectively, which demonstrate that onboard calibration coefficients calculated by the look-up table method has better precision and feasibility.

10.
Sichuan Da Xue Xue Bao Yi Xue Ban ; 45(1): 62-5, 2014 Jan.
Artículo en Zh | MEDLINE | ID: mdl-24527584

RESUMEN

OBJECTIVE: To examine the association of collagen type I alpha1 (COLIA1) Sp1 polymorphism with intervertebral disc degeneration in Han elderly people. METHODS: The objects in this case-control study were the Han elderly people over 65-years-old. There were totally 375 intervertebral disc degeneration patients and 118 healthy controls matched in demographic characteristics recruited. The guanine (G) to thymidine (T) polymorphism in the first intron of COLIA1 gene was detected by PCR. Detected the difference of genotype frequency distribution and allele frequency between case group and the control group. RESULTS: Hardy-Weinberg equilibrium was analyzed in both case and control group. Sp1 site was genotyped, and the polymorphisms distributed in line with Hardy-Weinberg equilibrium either in case or control groups. There was significant difference in genotype frequency of Sp1 between control group and case group. GG: 264 (70.4%)/82 (69.5%), GT: 102 (27.2%)/26 (22.0%) and TT: 9 (2.4%)/10 (8.5%), respectively; (chi2 = 9.527, P = 0.009). No significant difference in allele frequencies of SNP was found between case group and control group. G: 630 (84.0%)/190 (80.5%) and T: 120 (16.0%)/46 (19.5%), respectively. (chi2 = 1.563, P = 0.211). CONCLUSION: COLIA1 Sp1 polymorphism may be a genetic risk factor related to intervertebral disc degeneration in Han elderly people.


Asunto(s)
Colágeno Tipo I/genética , Degeneración del Disco Intervertebral/genética , Polimorfismo Genético , Anciano , Estudios de Casos y Controles , Cadena alfa 1 del Colágeno Tipo I , Frecuencia de los Genes , Genotipo , Humanos , Reacción en Cadena de la Polimerasa
11.
Guang Pu Xue Yu Guang Pu Fen Xi ; 33(7): 1903-7, 2013 Jul.
Artículo en Zh | MEDLINE | ID: mdl-24059198

RESUMEN

The resolution of the ZY-3 MUX data is 5.8 meter, which is used to the subject classification. It is very difficult to use the dark target method for the atmosphere correction due to the lack of near infrared band in ZY-3 MUX data. The present paper uses the atmospheric correction coefficient look-up table (LUT) constructed by the radiation transmission model 6S based on the aerosol optical depth retrieved from the MODIS data for the atmospheric correction of ZY-3 image. To validate the results, the paper compares the surface spectral curves of the gypsum mine and Gobi and the NDVI values from the corrected and TOA reflectance, the relative error of the atmosphere corrected and the ground-based surface reflectance is less than 6%; the atmospheric correction increases the difference between vegetation NDVI and other features NDVI, highlights vegetation monitoring application ability.

12.
Int J Nanomedicine ; 18: 2053-2068, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37101838

RESUMEN

Background and Purpose: Luteolin (LUT), a flavonoid found in various plants, has been reported to have potential therapeutic effects in melanoma. However, poor water solubility and low bioactivity have severely restricted the clinical application of LUT. Based on the high reactive oxygen species (ROS) levels in melanoma cells, we developed nanoparticles encapsulating LUT with the ROS-responsive material poly(propylene sulfide)-poly(ethylene glycol) (PPS-PEG) to enhance the water solubility of LUT, accelerate the release of LUT in melanoma cells, and further enhance its anti-melanoma effect, providing a viable solution for the application of LUT nano-delivery systems in melanoma therapy. Methods: In this study, LUT-loaded nanoparticles were prepared with PPS-PEG and named as LUT-PPS-NPs. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) were applied to determine the size and morphology of LUT-PPS-NPs. In vitro studies were carried out to determine the uptake and mechanism of LUT-PPS-NPs by SK-MEL-28 melanoma cells. According to the CCK-8 assay, the cytotoxic effects of LUT-PPS-NPs on human skin fibroblasts (HSF) and SK-MEL-28 cells were assessed. Apoptosis assays, cell migration and invasion assays, and proliferation inhibition assays with low and normal density plating were also applied to test the in vitro anti-melanoma effect. Additionally, melanoma models were established utilizing BALB/c nude mice and initially evaluated the growth inhibitory impact following intratumoral injection of LUT-PPS-NPs. Results: The size of LUT-PPS-NPs was 169.77 ± 7.33 nm with high drug loading (15.05 ± 0.07%). In vitro, cellular assays confirmed that LUT-PPS-NPs were efficiently internalized by SK-MEL-28 cells and showed low cytotoxicity against HSF. Moreover, LUT released from LUT-PPS-NPs significantly inhibited tumor cell proliferation, migration and invasion. Animal experiments showed that LUT-PPS-NPs inhibited tumor growth more than 2-fold compared with the LUT group. Conclusion: In conclusion, the LUT-PPS-NPs developed in our study enhanced the anti-melanoma effect of LUT.


Asunto(s)
Melanoma , Nanopartículas , Animales , Ratones , Humanos , Luteolina/farmacología , Luteolina/uso terapéutico , Ratones Desnudos , Especies Reactivas de Oxígeno , Melanoma/tratamiento farmacológico , Agua , Línea Celular Tumoral
13.
Anal Chim Acta ; 1252: 341046, 2023 Apr 29.
Artículo en Inglés | MEDLINE | ID: mdl-36935150

RESUMEN

Whole-cell biosensors are an important class of analytical tools that offer the advantages of low cost, facile operation, and unique reproduction/regeneration ability. However, it has always been quite challenging to expand the sensing spectrum of the host. Here, a new approach to extend the cell sensing spectrum with biomineralized nanoparticles is developed. The nano-biohybrid design comprise biomineralized FeS nanoparticles firmly anchored onto the bacterium, Shewanella oneidensis MR-1, wherein the nanoparticles are wired to the cellular electron transfer machinery (MtrCAB/OmcA) of the bacterium, forming an artificial cyborgian redox machinery consisting of FeS-MtrCAB/OmcA-FccA. Strikingly, with this cyborgian redox machinery, the sensing spectrum of FeS hybridized S. oneidensis MR-1 cell is successfully expanded to enable whole-cell electrochemical detection of Vitamin B12, while an unhybridized native cell is incapable of sensing. This proof-of-concept nano-biohybrid design offers a new perspective on manipulating the microbial toolkit for an expanded sensing spectrum in whole-cell biosensors.


Asunto(s)
Nanopartículas , Shewanella , Oxidación-Reducción , Transporte de Electrón
14.
Comput Intell Neurosci ; 2022: 5904707, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35983153

RESUMEN

With the continuous development of China's digital economy and the continuous heating of the real estate market, real estate tax base assessment occupies an important position in the real estate market. The purpose is to improve the work efficiency of relevant personnel of real estate tax base assessment, reduce workload pressure, and improve the evaluation level. Real estate tax base assessment and real estate appraisal are studied in detail, and the factors of the real estate tax base assessment index are analyzed. Different real estate tax base assessment methods are compared, and the difference and connection between different methods are explored. The theory of batch assessment of real estate tax base is analyzed in depth, and the procedures for batch assessment implementation are summarized. On this basis, a deep learning neural network (DLNN) theory is proposed, and a real estate tax base assessment model based on DLNN is constructed. The reliability, accuracy, and relative superiority of the model are analyzed in detail, and the model is used to test the sample data and analyze the error. The results reveal that the DLNN model has better data fit and good reliability. Compared with other algorithms, it has certain advantages and smaller error values. In the sample test, the test value is closer to the actual value, the error is controllable, and it has high accuracy. Through training, it shows that the DL model has an excellent performance in tax base assessment, can meet the requirements of efficient batch assessment, and is expected to achieve the goal of completing a huge workload in a limited time and improve work efficiency. The real estate tax base assessment model by DLNN can bring some help to the real estate finance and taxation work and provide a reference for the batch assessment of tax base in the real estate industry.


Asunto(s)
Aprendizaje Profundo , Industrias , Redes Neurales de la Computación , Reproducibilidad de los Resultados
15.
Mol Biotechnol ; 64(11): 1259-1269, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-35556220

RESUMEN

This study is to clarify the effect of the long non-coding RNA ArfGAP with RhoGAP domain, ankyrin repeat and PH domain 1-antisense RNA 1 (ARAP1-AS1)/microRNA (miR)-3918/kinesin family member 20A (KIF20A) on bladder cancer cell function. ARAP1-AS1, miR-3918, and KIF20A expression levels in bladder cancer cells were determined using quantitative reverse transcription-polymerase chain reaction. The effects of ARAP1-AS1, miR-3918, and KIF20A on bladder cell activity, proliferation, apoptosis, and in vivo growth were examined using the cell counting kit-8, colony formation, caspase-3 activity, and xenograft tumor growth assays, respectively, in nude mice. The binding relationships among ARAP1-AS1, miR-3918, and KIF20A were analyzed using luciferase and RNA immunoprecipitation assays. ARAP1-AS1 and KIF20A were overexpressed in bladder cancer, while miR-3918 was underexpressed. The downregulation of ARAP1-AS1 or KIF20A expression significantly inhibited the viability and proliferation of cancer cells and promoted apoptosis, whereas low expression of miR-3918 or high expression of ARAP1-AS1/KIF20A showed the opposite effect. miR-3918 was sponged by ARAP1-AS1, and targeted KIF20A. In addition, miR-3918 expression was inversely correlated with ARAP1-AS1 and KIF20a expression levels in bladder cancer tissues. In addition, the rescue experiment showed that interference with miR-3918 could reverse the effect of low ARAP1-AS1 or KIF20A expression on bladder cancer cell malignancy. ARAP1-AS1 facilitates the malignant behavior of bladder cancer cells via the regulation of KIF20A expression by sponging miR-3918.


Asunto(s)
MicroARNs , ARN Largo no Codificante , Neoplasias de la Vejiga Urinaria , Animales , Proteínas Portadoras/genética , Caspasa 3/genética , Caspasa 3/metabolismo , Línea Celular Tumoral , Movimiento Celular , Proliferación Celular/genética , Proteínas Activadoras de GTPasa/genética , Proteínas Activadoras de GTPasa/metabolismo , Regulación Neoplásica de la Expresión Génica , Humanos , Cinesinas/genética , Ratones , Ratones Desnudos , MicroARNs/genética , MicroARNs/metabolismo , ARN sin Sentido/genética , ARN Largo no Codificante/genética , ARN Largo no Codificante/metabolismo , Neoplasias de la Vejiga Urinaria/genética , Neoplasias de la Vejiga Urinaria/metabolismo , Neoplasias de la Vejiga Urinaria/patología
16.
Bioengineered ; 13(4): 9411-9424, 2022 04.
Artículo en Inglés | MEDLINE | ID: mdl-35412947

RESUMEN

PCGEM1 facilitates prostate cancer (PCa) progression. This study aimed to elucidate the mechanism of action of PCGEM1 in PCa. The expression of PCGEM1, microRNA miR-129-5p, chromatin licensing, and DNA replication factor 1 (CDT1) was detected by quantitative reverse transcription-PCR (qRT-PCR). A series of function experiments including cell counting kit-8 (CCK-8), caspase-3 activity, and cell cycle assays were performed to evaluate the influence of PCGEM1, miR-129-5p, and CDT1 on the biological processes of PCa cells. CyclinD1, cyclin dependent kinase 4 (CDK4), Bax, and Bcl-2 protein levels were measured by western blotting. Subcellular isolation revealed the distribution of PCa cells. The connections between PCGEM1, miR-129-5p, and CDT1 were evaluated by luciferase, RIP assay, and Pearson correlation analysis. Both PCGEM1 and CDT1 were upregulated in PCa, while miR-129-5p was downregulated and negatively correlated with PCGEM1 and CDT1. Downregulation of PCGEM1 or CDT1 inhibited the viability, promoted apoptosis and cycle arrest of PCa cells in vitro, and controlled tumor growth in vivo. PCGEM1 plays a crucial role in the progression of PCa by sponging miR-129-5p as a ceRNA of CDT1. PCGEM1 is a CDT1-dependent PCa promoter site that absorbs miR-129-5p.


Asunto(s)
Proteínas de Ciclo Celular , MicroARNs , Neoplasias de la Próstata , ARN Largo no Codificante , Proteínas de Ciclo Celular/genética , Proteínas de Ciclo Celular/metabolismo , Línea Celular Tumoral , Movimiento Celular/genética , Proliferación Celular/genética , Cromatina/metabolismo , Replicación del ADN , Regulación Neoplásica de la Expresión Génica/genética , Humanos , Masculino , MicroARNs/genética , MicroARNs/metabolismo , Neoplasias de la Próstata/genética , Neoplasias de la Próstata/patología , ARN Largo no Codificante/genética , ARN Largo no Codificante/metabolismo
17.
Sci Total Environ ; 830: 154806, 2022 Jul 15.
Artículo en Inglés | MEDLINE | ID: mdl-35341857

RESUMEN

Microbial fuel cell (MFC) was a promising technology for energy harvesting from wastewater. However, inefficient bacterial extracellular electron transfer (EET) limited the performance as well as the applications of MFC. Here, a new strategy to reinforce the EET by engineering synthetic extracellular matrix (ECM) with cytochrome fused curli was developed. By genetically fusing a minimal cytochrome domain (MCD) with the curli protein CsgA and heterogeneously expressing in model exoelectrogen of Shewanella oneidensis MR-1, the cytochrome fused electroactive curli network was successfully constructed and assembled. Interestingly, the strain with the MCD fused synthetic ECM delivered about 2.4 times and 2.0 times higher voltage and power density output than these of wild type MR-1 in MFC. More impressively, electrochemical analysis suggested that this synthetic ECM not only introduced cytochrome of MCD, but also attracted more self-secreted electrochemically active substances, which might facilitate the EET and improve the MFC performance. This work demonstrated the possibility to manipulation the EET with ECM engineering, which opened up new path for exoelectrogen design and engineering.


Asunto(s)
Fuentes de Energía Bioeléctrica , Fuentes de Energía Bioeléctrica/microbiología , Citocromos , Transporte de Electrón , Electrones , Matriz Extracelular
18.
Bioresour Bioprocess ; 9(1): 41, 2022 Apr 04.
Artículo en Inglés | MEDLINE | ID: mdl-38647739

RESUMEN

Atom-transfer radical polymerization (ATRP) is a well-known technique for controlled polymer synthesis. However, the ATRP usually employed toxic heavy metal ionas as the catalyst and was susceptible to molecular oxygen, which made it should be conducted under strictly anoxic condition. Conducting ATRP under ambient and biocompatible conditions is the major challenge. In this study, cytochrome C was explored as an efficient biocatalyst for ATRP under biocompatible conditions. The cytochrome C catalyzed ATRP showed a relatively low polymer dispersity index of 1.19. More interestingly, the cytochrome C catalyzed ATRP showed superior oxygen resistance as it could be performed under aerobic conditions with high dissolved oxygen level. Further analysis suggested that the Fe(II) embed in the cytochrome C might serve as the catalytic center and methyl radical was responsible for the ATRP catalysis. This work explored new biocompatible catalyst for aerobic ATRP, which might open new dimension for practical ATRP and application of cytochrome C protein.

19.
Shanghai Kou Qiang Yi Xue ; 29(6): 632-637, 2020 Dec.
Artículo en Zh | MEDLINE | ID: mdl-33778832

RESUMEN

PURPOSE: To investigate the relationships among tongue volume, hyoid position, airway volume and maxillofacial form in paediatric patients with Class Ⅰ, Class Ⅱ and Class Ⅲ malocclusion. METHODS: Data of 112 children with malocclusion in the Department of Stomatology, Wuxi Children's Hospital from December 2015 to December 2018 were collected. The children were divided into three groups according to Angle's classification: Class Ⅰ (n=42), Class Ⅱ (n=38) and Class Ⅲ (n=32). Tongue volume was evaluated by oral B-ultrasound, the hyoid position was obtained by lateral cephalogram, then the airway volume and maxillofacial form were evaluated by cone-beam CT (CBCT). Relationship among tongue volume, hyoid position, airway volume and maxillofacial form were analyzed. The data were processed by SPSS 20.0 software package. RESULTS: The tongue volume of Class III was significantly larger than that of Class I and Class II (P<0.05); H-FH and H-MP of Class II were significantly larger than those of Class I and Class III, and H-VL was significantly smaller than that of Class I and Class III (P<0.05). H-FH and H-MP of Class III were significantly smaller than those of Class I, and H-S was significantly larger than that of Class I (P<0.05); V throat of three types was the largest in Class Ⅲ, followed by Class I and Class Ⅱ, with significant difference (P<0.05). V nose of three types was the largest in Class Ⅱ, followed by Class I and Class Ⅲ, with significant difference (P<0.05). SNB angle of three types was the largest in Class Ⅲ, followed by Class Ⅰ and Class Ⅱ, with significant difference (P<0.05). ANB angle was the largest in Class I, followed by Class Ⅱ and Class Ⅲ, with significant difference (P<0.05). Tongue volume was positively correlated with V throat, V nose, and SNB, and negatively correlated with H-FH and ANB (P<0.05). H-FH and H-MP were negatively correlated with SNB angle and positively correlated with H-MP and ANB angle (P<0.05). CONCLUSIONS: Children with Class Ⅲ malocclusion have larger tongue volume, upward displacement of hyoid, and smaller nasopharyngeal volume. Children with Class II malocclusion have small tongue volume, downward displacement of hyoid, and small oropharyngeal volume. Tongue volume, hyoid position, airway volume and maxillofacial form are significantly correlated in paediatric patients with malocclusions, the influence of mandibular recession on the shape of upper airway should be considered during orthodontic treatment, in order to achieve the best aesthetic and therapeutic effects.


Asunto(s)
Maloclusión de Angle Clase III , Maloclusión Clase II de Angle , Maloclusión , Cefalometría , Niño , Estética Dental , Humanos , Hueso Hioides/diagnóstico por imagen , Maloclusión Clase II de Angle/diagnóstico por imagen , Maloclusión de Angle Clase III/diagnóstico por imagen , Mandíbula , Lengua/diagnóstico por imagen
20.
Neurobiol Dis ; 34(1): 155-62, 2009 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-19320055

RESUMEN

Over-expression of CCS in G93A SOD1 mice accelerates neurological disease and enhances mitochondrial pathology. We studied the effect of CCS over-expression in transgenic mice expressing G37R, G86R or L126Z SOD1 mutations in order to understand factors which influence mitochondrial dysfunction. Over-expression of CCS markedly decreased survival and produced mitochondrial vacuolation in G37R SOD1 mice but not in G86R or L126Z SOD1 mice. Moreover, CCS/G37R SOD1 spinal cord showed specific reductions in mitochondrial complex IV subunits consistent with an isolated COX deficiency, while no such reductions were detected in CCS/G86R or CCS/L126Z SOD1 mice. CCS over-expression increased the ratio of reduced to oxidized SOD1 monomers in the spinal cords of G37R SOD1 as well as G93A SOD1 mice, but did not influence the redox state of G86R or L126Z SOD1 monomers. The effects of CCS on disease are SOD1 mutation dependent and correlate with SOD1 redox susceptibility.


Asunto(s)
Mitocondrias/metabolismo , Chaperonas Moleculares/metabolismo , Médula Espinal/metabolismo , Superóxido Dismutasa/genética , Animales , Western Blotting , Complejo IV de Transporte de Electrones/metabolismo , Inmunohistoquímica , Estimación de Kaplan-Meier , Ratones , Ratones Transgénicos , Microscopía Electrónica , Mitocondrias/ultraestructura , Mutación , Oxidación-Reducción , Médula Espinal/ultraestructura , Superóxido Dismutasa-1
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