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https://www.readbyqxmd.com/read/29035746/the-exploration-of-endocytic-mechanisms-of-pla-peg-nanoparticles-prepared-by-coaxialtri-capillary-electrospray-template-removal-method
#1
Jiaming Chen, Lihua Cao, Yuecheng Cui, Kehua Tu, Hongjun Wang, Li-Qun Wang
The nano-sized poly(lactic acid)-poly(ethylene glycol) (PLA-PEG) particles with core-shell structure were efficiently prepared by using coaxial tri-capillary electrospray-template removal method. The cellular uptake mechanism, intracellular distribution and exocytosis in A549 cell model of electrosprayed PLA-PEG nanoparticles were systemically studied. The drug release behavior of electrosprayed PLA-PEG nanoparticles were also investigated. Our results showed that PLA-PEG nanoparticles can be endocytosed quickly by A549 cells...
October 2, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29035728/engineering-pediococcus-acidilactici-with-xylose-assimilation-pathway-for-high-titer-cellulosic-l-lactic-acid-fermentation
#2
Zhongyang Qiu, Qiuqiang Gao, Jie Bao
Xylose-assimilating pathways were constructed in the parental Pediococcus acidilactici strain and evolutionarily adapted to yield a highly stable co-fermentation strain for l-lactic acid production. The phosphoketolase pathway (PK) was blocked for reduction of acetic acid generation by disrupting phosphoketolase (pkt) gene. The pentose phosphate pathway (PPP) was reconstructed for xylose assimilation by integrating four heterologous genes encoding transketolase (tkt), transaldolase (tal), xylose isomerase (xylA) and xylulokinase (xylB) into the P...
September 21, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29035335/selectivity-enhancement-in-electronic-nose-based-on-an-optimized-dqn
#3
Yu Wang, Jianguo Xing, Shu Qian
In order to enhance the selectivity of metal oxide gas sensors, we use a flow modulation method to exploit transient sensor information. The method is based on modulating the flow of the carrier gas that brings the species to be measured into the sensor chamber. We present an active perception strategy by using a DQN which can optimize the flow modulation online. The advantage of DQN is not only that the classification accuracy is higher than traditional methods such as PCA, but also that it has a good adaptability under small samples and labeled data...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035132/hybrid-lipid-polymer-nanoparticles-for-pulmonary-delivery-of-sirna-development-and-fate-upon-in-vitro-deposition-on-the-human-epithelial-airway-barrier
#4
Ivana d'Angelo, Gabriella Costabile, Estelle Durantie, Paola Brocca, Valeria Rondelli, Annapina Russo, Giulia Russo, Agnese Miro, Fabiana Quaglia, Alke Petri-Fink, Barbara Rothen-Rutishauser, Francesca Ungaro
BACKGROUND: Nowadays, the downregulation of genes involved in the pathogenesis of severe lung diseases through local siRNA delivery appears an interesting therapeutic approach. In this study, we propose novel hybrid lipid-polymer nanoparticles (hNPs) consisting of poly(lactic-co-glycolic) acid (PLGA) and dipalmitoyl phosphatidylcholine (DPPC) as siRNA inhalation system. METHODS: A panel of DPPC/PLGA hNPs was prepared by emulsion/solvent diffusion and fully characterized...
October 16, 2017: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/29034853/floricoccus-tropicus-gen-nov-sp-nov-and-floricoccus-penangensis-sp-nov-isolated-from-fresh-flowers-of-durian-tree-and-hibiscus
#5
Li-Oon Chuah, Kien-Pong Yap, Ahamed Kamal Shamila-Syuhada, Kwai Lin Thong, Rosma Ahmad, Min Tze Liong, Gulam Rusul
Three strains of Gram-staining-positive, coccus-shaped, lactic acid bacteria, designated as HibF3(T), HibF2 and HibF5 were isolated from fresh flowers of hibiscus, and a fourth, DF1(T), was isolated from fresh flowers of durian tree, in Penang, Malaysia. Taxonomic characterisation was performed by polyphasic analysis. Sequence similarities of the 16S rRNA gene and the housekeeping rpoA and pheS genes of these strains with their closely-related lactococcal and streptococcal relatives were 92-94, 78 and 81 %, respectively...
October 16, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29033074/potentially-active-spoilage-bacteria-community-during-the-storage-of-vacuum-packaged-beefsteaks-treated-with-aqueous-ozone-and-electrolyzed-water
#6
Cristian Botta, Ilario Ferrocino, Maria Chiara Cavallero, Simonetta Riva, Manuela Giordano, Luca Cocolin
The microbial contamination that occurs during the slaughtering process and during handling of the meat results in a shortening of the shelf-life of meat. In this study, which has had the aim of extending the shelf life of beefsteaks, pilot-scale treatments were carried out with aqueous ozone (AO) and electrolyzed water (EW) before vacuum packaging (VP). The development of the potentially active microbiota and the associated volatilome were followed over 15days of storage under refrigerated conditions (4°C), in order to define the potential long-term effects of the treatments and storage condition on microbiota...
October 7, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29032650/immunomodulatory-potential-of-weissella-cibaria-in-aged-c57bl-6j-mice
#7
Ho-Eun Park, Kyung-Won Kang, Bum-Seok Kim, Sang-Myeong Lee, Wan-Kyu Lee
Aging is associated with distinct changes in immune cells and a decline in immune function, leading to increased susceptibility to infection and reduced responses to vaccination. Certain strains of lactic acid bacteria exert beneficial effects on the immune system. Previously, we reported that Weissella cibaria JW15 isolated from kimchi possesses immune stimulatory activity in vitro. In the present study, we further investigated whether oral administration of JW15 improves immune function in aged mice. Eighteen-month-old female mice were administered JW15 daily at low (JW15-L; 1×10⁸ CFU/mouse) or high dosage (JW15-H; 1×10⁸ CFU/mouse), or with Lactobacillus rhamnosus GG using oral gavage...
October 14, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29031981/fabrication-and-characterization-of-gefitinib-releasing-polyurethane-foam-as-a-coating-for-drug-eluting-stent-in-the-treatment-of-bronchotracheal-cancer
#8
Weiluan Chen, Chiara di Carlo, Donal Devery, Donnacha J McGrath, Peter E McHugh, Kathrin Kleinsteinberg, Stefan Jockenhoevel, Wim E Hennink, Robbert J Kok
The purpose of the present study was to develop gefitinib-loaded polymeric foams that can be used as coating of drug-eluting stents for palliative treatment of bronchotracheal cancer. Release of such an anticancer drug from such stent coating can retard tumor regrowth into the bronchial lumen. Gefitinib-loaded polyurethane (PU) foams were prepared by embedding either gefitinib micronized crystals or gefitinib-loaded poly(lactic-co-glycolic acid) microspheres in water-blown films, with up to 10% w/w loading for gefitinib microcrystals and 15% w/w for gefitinib microspheres (corresponding to 1...
October 12, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29031944/comparison-of-lactic-acid-levels-in-children-with-suspected-and-confirmed-intussusception
#9
Vanessa Tamas, Paul Ishimine
BACKGROUND: Currently, no laboratory test can identify children with intussusception. Lactic acid is a marker of ischemia in gastrointestinal emergencies. OBJECTIVES: We present a case series comparing lactic acid levels in children with suspected and confirmed intussusception. METHODS: This is a prospective single case series of 39 patients who had suspected intussusception. Patients were eligible if they underwent abdominal ultrasound screening for suspected intussusception...
October 11, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29030967/preservation-of-ceriporiopsis-subvermispora-and-lentinula-edodes-treated-wheat-straw-under-anaerobic-conditions
#10
Lei Mao, Anton S M Sonnenberg, Wouter H Hendriks, John W Cone
BACKGROUND: No attention has been paid so far to the preservation of fungal treated lignocellulose for longer periods. Here we treated wheat straw (WS) with the white-rot fungi Ceriporiopsis subvermispora and Lentinula edodes for 8 weeks and assessed changes in pH, chemical composition and in vitro gas production (IVGP) weekly. Fungal treated WS was also stored for 64 days as is, with addition of lactic acid bacteria (LAB) or with a combination of LAB and molasses in airtight glass jars mimicking ensiling conditions...
October 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29030449/purification-characterization-and-heterologous-production-of-plantaricyclin-a-a-novel-circular-bacteriocin-produced-by-lactobacillus-plantarum-ni326
#11
Juan Borrero, Eoin Kelly, Paula M O'Connor, Philip Kelleher, Colm Scully, Paul D Cotter, Jennifer Mahony, Douwe van Sinderen
Bacteriocins from lactic acid bacteria (LAB) are of increasing interest in recent years due to their potential as natural preservatives against food and beverage spoilage microorganisms. In a screening study for LAB, we isolated a strain, Lactobacillus plantarum NI326, from olives with activity against a strain belonging to the beverage-spoilage bacterium Alicyclobacillus acidoterrestris spp. Genome sequencing of the strain enabled the identification of a gene cluster encoding a putative circular bacteriocin and proteins involved in its modification, transport and immunity...
October 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29030182/biosynthesis-of-dextran-by-weissella-confusa-and-its-in-vitro-functional-characteristics
#12
Irina Rosca, Anca Roxana Petrovici, Dragos Peptanariu, Alina Nicolescu, Gianina Dodi, Mihaela Avadanei, Iuliu Cristian Ivanov, Andra Cristina Bostanaru, Mihai Mares, Diana Ciolacu
The aim of this study was to monitor the influence of the fermentation conditions on the exopolysaccharides (EPS) biosynthesis. For this, different culture media compositions were tested on an isolated lactic acid bacteria (LAB) strain, identified by 16S rDNA sequence as being Weissella confusa. It was proved that this bacterial strain culture in MRS medium supplemented with 80g/L sucrose and dissolved in UHT milk produced up to 25.2g/L of freeze-dried EPS, in static conditions, after 48hours of fermentative process...
October 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29029435/anti-sstr2-peptide-based-targeted-delivery-of-potent-plga-encapsulated-3-3-diindolylmethane-nanoparticles-through-blood-brain-barrier-prevents-glioma-progression
#13
Arijit Bhowmik, Sayak Chakravarti, Aparajita Ghosh, Rajni Shaw, Suman Bhandary, Satyaranjan Bhattacharyya, Parimal C Sen, Mrinal K Ghosh
Current therapy for Glioblastoma is insufficient because of the presence of blood brain barrier. It limits the transport of essential drugs to the tumor sites. To overcome this limitation we strategized the delivery of an anticancer compound 3,3'-diindolylmethane by encapsulation in poly (lactic-co-glycolic acid) nanoparticles. These nanoparticles were tagged with a novel peptide against somatostatin receptor 2 (SSTR2), a potential target in glioma. The nanoformulation (27-87nm) had loading and encapsulation efficiency of 7...
September 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/29028076/intestinal-probiotics-in-relieving-clinical-symptoms-of-severe-hand-foot-and-mouth-disease-and-potential-mechanism-analysis
#14
F Zhu, Z Jiang, H-W Li
OBJECTIVE: In this prospective cohort study, the efficacy and action mechanism of an intestinal probiotic formulation, Golden Bifid, in severe hand, foot, and mouth disease (HFMD) were determined in 63 consecutively admitted patients successfully treated in the Pediatrics Emergency Department of our hospital. PATIENTS AND METHODS: All patients had a persistent fever; 43 patients had rashes on hands, feet, crissum, and hips; and 45 patients had neurological signs and symptoms...
September 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29028070/gene-expression-in-human-adipose-derived-stem-cells-comparison-of-2d-films-3d-electrospun-meshes-or-co-cultured-scaffolds-with-two-way-paracrine-effects
#15
S C Hess, W J Stark, D Mohn, N Cohrs, S Märsmann, M Calcagni, P Cinelli, J Buschmann
Finding the appropriate cues to trigger the desired differentiation is a challenge in tissue engineering when stem cells are involved. In this regard, three-dimensional environments are often compared to cells' two-dimensional culture behaviour (plastic culture dish). Here, we compared the gene expression pattern of human adipose-derived stem cells (ASC) seeded in a three-dimensional (3D) electrospun mesh and on a two-dimensional (2D) film - both of exactly the same material. Additionally, we conducted experiments with a scaffold floating above a film to investigate two-way paracrine effects (co-system)...
October 13, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/29026656/phylogenomics-and-comparative-genomics-of-lactobacillus-salivarius-a-mammalian-gut-commensal
#16
Hugh M B Harris, Maxence J B Bourin, Marcus J Claesson, Paul W O'Toole
The genus Lactobacillus is a diverse group with a combined species count of over 200. They are the largest group within the lactic acid bacteria and one of the most important bacterial groups involved in food microbiology and human nutrition because of their fermentative and probiotic properties. Lactobacillus salivarius, a species commonly isolated from the gastrointestinal tract of humans and animals, has been described as having potential probiotic properties and results of previous studies have revealed considerable functional diversity existing on both the chromosomes and plasmids...
August 2017: Microbial Genomics
https://www.readbyqxmd.com/read/29026645/synthesis-and-characterization-of-collagen-plga-biodegradable-skin-scaffold-fibers
#17
Alireza Sadeghi-Avalshahr, Samira Nokhasteh, Amir Mahdi Molavi, Mohammad Khorsand-Ghayeni, Meysam Mahdavi-Shahri
The aim of this study is to investigate the applicability of poly(lactic-co-glycolic acid) (PLGA)/collagen composite scaffold for skin tissue engineering. PLGA and collagen were dissolved in HFIP as a common solvent and fibrous scaffolds were prepared by electrospinning method. The scaffolds were characterized by scanning electron microscopy (SEM), FTIR spectroscopy, mercury porosimetry, tensile strength, biocompatibility assays and Biodegradation. Cytotoxicity and cell adhesion were tested for two cell line groups, human dermal fibroblast (HDF) and human keratinocyte (HaCat)...
October 2017: Regenerative Biomaterials
https://www.readbyqxmd.com/read/29026303/delivery-of-antagomir204-conjugated-gold-nanoparticles-from-plga-sheets-and-its-implication-in-promoting-osseointegration-of-titanium-implant-in-type-2-diabetes-mellitus
#18
Xiangwei Liu, Naiwen Tan, Yuchao Zhou, Hongbo Wei, Shuai Ren, Fan Yu, Hui Chen, Chengming Jia, Guodong Yang, Yingliang Song
Impaired osseointegration of the implant remains the big hurdle for dental implant therapy in diabetic patients. In this study, the authors first identified that miR204 was strikingly highly expressed in the bone mesenchymal stem cells (BMSCs) of diabetic rats. Forced expression of miR204 repressed the osteogenic potential of BMSCs, while inhibition of miR204 significantly increased the osteogenic capacity. Moreover, the miR204 inhibitor was conjugated with gold nanoparticles (AuNP-antagomiR204) and dispersed them in the poly(lactic-co-glycolic acid) (PLGA) solution...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29025656/dual-delivery-of-vegf-and-ngf-by-emulsion-electrospun-nanofibrous-scaffold-for-peripheral-nerve-regeneration
#19
Bin Xia, Yonggang Lv
Controlled delivery of multiple therapeutic agents can be considered an effective approach in nerve injury due to its multifunction. In this study, recombinant human vascular endothelial growth factor (VEGF) and recombinant human nerve growth factor (NGF) were loaded on the surface and in the core of emulsion electrospun poly (l-lactic acid) (PLLA) nanofibrous scaffold, respectively. The in vitro studies showed that VEGF and NGF had a sequential release pattern in which most of the VEFG was released in the first few days but the NGF could be continuously released for >1month...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29024376/evaluation-of-collagen-foam-poly-l-lactic-acid-nanofiber-mesh-and-decellularized-matrices-for-corneal-regeneration
#20
Bahar Aslan, Selcan Guler, Atakan Tevlek, Halil Murat Aydin
Corneal tissue engineering efforts to obtain corneal tissue matrices through various types of materials for the replacement of damaged tissues. In this study, three different corneal constructs were prepared and evaluated in terms of morphological, optical, and biological characteristics. Type-I collagen was used to obtain collagen foam scaffolds through dehydrothermal crosslinking, while poly(l-lactic acid) (PLLA) was used to produce both random and aligned oriented electrospun corneal constructs. Bovine corneas were decellularized as third matrix...
October 12, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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