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https://www.readbyqxmd.com/read/28735529/spinel-ferrite-core-shell-nanostructures-by-a-versatile-solvothermal-seed-mediated-growth-approach-and-study-of-their-nanointerfaces
#1
Marco Sanna Angotzi, Anna Musinu, Valentina Mameli, Andrea Ardu, Claudio Cara, Daniel Niznansky, Huolin L Xin, Carla Cannas
An easy, low-cost, repeatable seed-mediated growth approach in solvothermal condition has been proposed to synthesize bimagnetic spinel ferrite core-shell heterostructures in the 10-20 nm particle size range. Cobalt ferrite and manganese ferrite nanoparticles (CoFe2O4 and MnFe2O4) have been coated with isostructural spinel ferrites like maghemite/magnetite, MnFe2O4 and CoFe2O4 with similar cell parameters to create different heterostructures. The conventional study of the structure, morphology and composition has been combined with advanced techniques in order to achieve details on the interface at the nanoscale level...
July 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28735148/mechanically-competent-and-cytocompatible-polycaprolactone-borophosphosilicate-hybrid-biomaterials
#2
Dibakar Mondal, S Jeffrey Dixon, Kibret Mequanint, Amin S Rizkalla
Organic-inorganic class II hybrid materials have domain sizes at the molecular level and chemical bonding between the organic and inorganic phases. We have previously reported the synthesis of class II hybrid biomaterials from alkoxysilane-functionalized polycaprolactone (PCL) and borophosphosilicate (B2O3-P2O5-SiO2) glass (BPSG) through a non-aqueous sol-gel process. In the present study, the mechanical properties and degradability of these PCL/BPSG hybrid biomaterials were studied and compared to those of their conventional composite counterparts...
July 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28734092/disentangling-the-role-of-seed-bank-and-dispersal-in-plant-metapopulation-dynamics-using-patch-occupancy-surveys
#3
F Manna, R Pradel, R Choquet, H Fréville, P-O Cheptou
In plants, the presence of a seed bank challenges the application of classical metapopulation models to above-ground presence surveys; ignoring seed bank leads to overestimated extinction and colonization rates. In this article, we explore the possibility to detect seed bank using hidden Markov models in the analysis of above-ground patch occupancy surveys of an annual plant with limited dispersal. Patch occupancy data were generated by simulation under two metapopulation sizes (N = 200 and N = 1000 patches) and different metapopulation scenarios, each scenario being a combination of the presence/absence of a one-year seed bank and the presence/absence of limited dispersal in a circular 1-dimension configuration of patches...
July 22, 2017: Ecology
https://www.readbyqxmd.com/read/28731632/macrophages-of-different-phenotypes-influence-the-migration-of-bmscs-in-plga-scaffolds-with-different-pore-size
#4
Yuankun Dai, Xuguang Li, Ruihan Wu, Ying Jin, Changyou Gao
Immune modulation of the scaffolds not only reduces the host immunological rejection response, but also improves the regenerative cell migration into the scaffolds. Herein a convenient immune modulation of poly(lactide-co-glycolide) (PLGA) scaffold was applied with macrophages of different phenotypes to evaluate its influence on the migration behavior of bone marrow mesenchymal stem cells (BMSCs). With pro-inflammatory macrophages (M1) pre-loading, BMSCs migrated significantly faster into the PLGA scaffold, compared with those in the control scaffold or pre-seeded with inactivated macrophages (M0)...
July 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28730527/characterization-of-the-complete-mitochondrial-genome-of-acanthoscelides-obtectus-coleoptera-chrysomelidae-bruchinae-with-phylogenetic-analysis
#5
Jie Yao, Hong Yang, Renhuai Dai
Acanthoscelides obtectus is a common species of the subfamily Bruchinae and a worldwide-distributed seed-feeding beetle. The complete mitochondrial genome of A. obtectus is 16,130 bp in length with an A + T content of 76.4%. It contains a positive AT skew and a negative GC skew. The mitogenome of A. obtectus contains 13 protein-coding genes (PCGs), 22 tRNA genes, two rRNA genes and a non-coding region (D-loop). All PCGs start with an ATN codon, and seven (ND3, ATP6, COIII, ND3, ND4L, ND6, and Cytb) of them terminate with TAA, while the remaining five (COI, COII, ND1, ND4, and ND5) terminate with a single T, ATP8 terminates with TGA...
July 20, 2017: Genetica
https://www.readbyqxmd.com/read/28727415/hydrophobic-nanosized-all-silica-beta-zeolite-efficient-synthesis-and-adsorption-application
#6
Zhiguo Zhu, Hao Xu, Jingang Jiang, Hai-Hong Wu, Peng Wu
All-silica Beta zeolite, synthesized by conventional hydroxide route, usually possesses small crystal size of a few hundred nanometers but poor hydrophobicity, whereas the fluoride-mediated one exhibits to be highly hydrophobic but microsized. To obtain nanosized all-silica Beta zeolite with excellent hydrophobicity, an innovative and efficient hydrothermal route via interzeolite transformation for synthesizing all-silica Beta zeolite is proposed in present study. With the assistance of Beta seeds and tetraethylammonium hydroxide as the structure-directing agent, siliceous Beta zeolite is well crystallized at a high solid yield via dissolution-recrystallization of all-silica ITQ-1 crystals at an extremely low water content (H2O/SiO2 molar ratio of 1)...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28726681/a-novel-cylindrical-microwell-featuring-inverted-pyramidal-opening-for-efficient-cell-spheroid-formation-without-cell-loss
#7
Jae Min Cha, HyungDal Park, Eun Kyoung Shin, Ji Hee Sung, Ockchul Kim, Woohyun Jung, Oh Young Bang, Jinseok Kim
Spheroid cultures have been often used to simulate and understand in situ biological occurrences with potential to be further applied to therapeutic approaches, such as cell transplantation. However, traditional lab-scale techniques hardly reached the needed large scale production of cell spheroids, thus limiting their versatility in many biomedical fields. Microscale technologies have rapidly improved in the last decade, and contributed to the large scale production of cell spheroids with high controllability and reproducibility...
July 20, 2017: Biofabrication
https://www.readbyqxmd.com/read/28725394/support-for-the-elevational-rapoport-s-rule-among-seed-plants-in-nepal-depends-on-biogeographical-affinities-and-boundary-effects
#8
Jianmeng Feng, Xiaokang Hu, Jie Wang, Yanmei Wang
As one of the most important hypotheses on biogeographical distribution, Rapoport's rule has attracted attention around the world. However, it is unclear whether the applicability of the elevational Rapoport's Rule differs between organisms from different biogeographical regions. We used Stevens' method, which uses species diversity and the averaged range sizes of all species within each (100 m) elevational band to explore diversity-elevation, range-elevation, and diversity-range relationships. We compared support for the elevational Rapoport's rule between tropical and temperate species of seed plants in Nepal...
October 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/28725367/the-effect-of-seed-traits-on-geographic-variation-in-body-size-and-sexual-size-dimorphism-of-the-seed-feeding-beetle-acanthoscelides-macrophthalmus
#9
Eloísa B Haga, Marcelo N Rossi
Explaining large-scale patterns of variation in body size has been considered a central question in ecology and evolutionary biology because several life-history traits are directly linked to body size. For ectothermic organisms, little is known about what processes influence geographic variation in body size. Changes in body size and sexual size dimorphism (SSD) have been associated with environmental variables, particularly for Bruchinae insects, which feed exclusively on seeds during the larval stage. However, the effect of important seed traits on body size variation has rarely been investigated, and whether SSD varies substantially among populations within bruchine species is poorly known...
October 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/28725174/altered-functional-connectivity-following-an-inflammatory-white-matter-injury-in-the-newborn-rat-a-high-spatial-and-temporal-resolution-intrinsic-optical-imaging-study
#10
Edgar Guevara, Wyston C Pierre, Camille Tessier, Luis Akakpo, Irène Londono, Frédéric Lesage, Gregory A Lodygensky
Very preterm newborns have an increased risk of developing an inflammatory cerebral white matter injury that may lead to severe neuro-cognitive impairment. In this study we performed functional connectivity (fc) analysis using resting-state optical imaging of intrinsic signals (rs-OIS) to assess the impact of inflammation on resting-state networks (RSN) in a pre-clinical model of perinatal inflammatory brain injury. Lipopolysaccharide (LPS) or saline injections were administered in postnatal day (P3) rat pups and optical imaging of intrinsic signals were obtained 3 weeks later...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28724433/gridsample-an-r-package-to-generate-household-survey-primary-sampling-units-psus-from-gridded-population-data
#11
Dana R Thomson, Forrest R Stevens, Nick W Ruktanonchai, Andrew J Tatem, Marcia C Castro
BACKGROUND: Household survey data are collected by governments, international organizations, and companies to prioritize policies and allocate billions of dollars. Surveys are typically selected from recent census data; however, census data are often outdated or inaccurate. This paper describes how gridded population data might instead be used as a sample frame, and introduces the R GridSample algorithm for selecting primary sampling units (PSU) for complex household surveys with gridded population data...
July 19, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28723902/seed-size-and-its-rate-of-evolution-correlate-with-species-diversification-across-angiosperms
#12
Javier Igea, Eleanor F Miller, Alexander S T Papadopulos, Andrew J Tanentzap
Species diversity varies greatly across the different taxonomic groups that comprise the Tree of Life (ToL). This imbalance is particularly conspicuous within angiosperms, but is largely unexplained. Seed mass is one trait that may help clarify why some lineages diversify more than others because it confers adaptation to different environments, which can subsequently influence speciation and extinction. The rate at which seed mass changes across the angiosperm phylogeny may also be linked to diversification by increasing reproductive isolation and allowing access to novel ecological niches...
July 19, 2017: PLoS Biology
https://www.readbyqxmd.com/read/28722149/masting-in-wind-pollinated-trees-system-specific-roles-of-weather-and-pollination-dynamics-in-driving-seed-production
#13
Michał Bogdziewicz, Jakub Szymkowiak, Idalia Kasprzyk, Łukasz Grewling, Zbigniew Borowski, Katarzyna Borycka, Władysław Kantorowicz, Dorota Myszkowska, Katarzyna Piotrowicz, Monika Ziemianin, Mario B Pesendorfer
Masting, the highly variable production of synchronized large seed crops, is a common reproductive strategy in plant populations. In wind-pollinated trees, flowering and pollination dynamics are hypothesized to provide the mechanistic link for the well-known relationship between weather and population-level seed production. Several hypotheses make predictions about the effect of weather on annual pollination success. The pollen coupling hypothesis predicts that weather and plant resources drive the flowering effort of trees which directly translates into the size of seed crops through efficient pollination...
July 19, 2017: Ecology
https://www.readbyqxmd.com/read/28721889/clinical-outcomes-of-large-brain-metastases-treated-with-neurosurgical-resection-and-intraoperative-cesium-131-brachytherapy-results-of-a-prospective-trial
#14
A Gabriella Wernicke, Cole B Hirschfeld, Andrew W Smith, Shoshana Taube, Menachem Z Yondorf, Bhupesh Parashar, Lucy Nedialkova, Fridon Kulidzhanov, Samuel Trichter, Albert Sabbas, Rohan Ramakrishna, Susan Pannullo, Theodore H Schwartz
PURPOSE: Studies on adjuvant stereotactic radiosurgery to the cavity of resected brain metastases have suggested that larger tumors (>2.0 cm) have greater rates of recurrence and radionecrosis (RN). The present study assessed the effect of permanent low-dose (131)Cs brachytherapy on local control and RN in patients treated for large brain metastases. METHODS AND MATERIALS: After institutional review board approval, 42 patients with 46 metastases ≥2.0 cm in preoperative diameter were accrued to a prospective trial from 2010 to 2015...
August 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28710068/gq-activated-fibroblasts-induce-cardiomyocyte-action-potential-prolongation-and-automaticity-in-a-3d-microtissue-environment
#15
Celinda M Kofron, Tae Yun Kim, Michelle E King, An Xie, Feng Feng, Elizabeth Park, Zhilin Qu, Bum-Rak Choi, Ulrike Mende
Cardiac fibroblasts (CFs) are known to regulate cardiomyocyte (CM) function in vivo and in 2D in vitro cultures. This study examined the effect of CF activation on the regulation of CM electrical activity in a 3D microtissue environment. Using a scaffold-free 3D platform with interspersed neonatal rat ventricular CMs and CFs, Gq-mediated signaling was selectively enhanced in CFs by Gαq adenoviral infection prior to co-seeding with CMs in non-adhesive hydrogels. After 3 days, the microtissues were analyzed by signaling assay, histological staining, quantitative PCR, Western blots, optical mapping with voltage- or calcium-sensitive dyes, and microelectrode recordings of CF resting membrane potential (RMPCF)...
July 14, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28709379/structure-of-supported-and-unsupported-catalytic-rh-nanoparticles-effects-on-nucleation-of-single-walled-carbon-nanotubes
#16
Jose Leonardo Gomez-Ballesteros, Perla B Balbuena
Achieving a better control of the nucleation and growth of single-walled carbon nanotubes requires understanding of the changes in the catalyst structure and the interfacial phenomena occurring at the solid surface and the gaseous phase from the early stages of the synthesis process. Carbon nanotubes produced by chemical vapor deposition typically use carbon-philic metal catalysts such as Fe, Ni and Co, in which both surface C and dissolved C atoms contribute to the nanotube formation. We use density functional theory to investigate the interactions of Rh, a noble metal, with carbon both as individual atoms gradually deposited on the catalyst surface from the precursor gas decomposition and as a nucleating seed adhered to the catalyst...
July 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28709319/golf-course-and-funnel-energy-landscapes-protein-folding-concepts-in-martensites
#17
N Shankaraiah
We use protein folding energy landscape concepts such as golf course and funnel to study re-equilibration in athermal martensites under systematic temperature quench Monte Carlo simulations. On quenching below a transition temperature, the seeded high-symmetry parent-phase austenite that converts to the low-symmetry product-phase martensite, through autocatalytic twinning or elastic photocopying, has both rapid conversions and incubation delays in the temperature-time-transformation phase diagram. We find the rapid (incubation delays) conversions at low (high) temperatures arises from the presence of large (small) size of golf-course edge that has the funnel inside for negative energy states...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709296/critical-behavior-of-a-two-step-contagion-model-with-multiple-seeds
#18
Wonjun Choi, Deokjae Lee, B Kahng
A two-step contagion model with a single seed serves as a cornerstone for understanding the critical behaviors and underlying mechanism of discontinuous percolation transitions induced by cascade dynamics. When the contagion spreads from a single seed, a cluster of infected and recovered nodes grows without any cluster merging process. However, when the contagion starts from multiple seeds of O(N) where N is the system size, a node weakened by a seed can be infected more easily when it is in contact with another node infected by a different pathogen seed...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709071/rapid-start-up-of-partial-nitritation-and-simultaneously-phosphorus-removal-pnspr-granular-sludge-reactor-treating-low-strength-domestic-sewage
#19
Jianhua Zhang, Qiong Zhang, Xiyao Li, Yuanyuan Miao, Yawen Sun, Miao Zhang, Yongzhen Peng
Obtaining desirable partial nitritation (PN) is crucial for successful application of the combined PN and anammox process. In this study, the partial nitritation and simultaneously phosphorus removal (PNSPR)(1) granular sludge reactor treating low-strength domestic sewage was rapidly started up in 67days through seeding denitrifying phosphorus removal (DPR)(2) sludge. The nitrite/ammonium ratio in effluent was approximately 1 and the nitrite accumulation rate (NAR) was more than 95%, about 93% of orthophosphate was removed...
June 26, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28708521/flow-cytometric-enrichment-of-pacific-bluefin-tuna-type-a-spermatogonia-based-on-light-scattering-properties
#20
REVIEW
Kensuke Ichida, Kazuyoshi Kise, Tetsuro Morita, Ryosuke Yazawa, Yutaka Takeuchi, Goro Yoshizaki
We previously established surrogate broodstock in which the donor germ cells transplanted into the peritoneal cavities of xenogeneic recipients were capable of developing into functional eggs and sperm in teleost fish. In this transplantation system, only the undifferentiated germ cells such as type A spermatogonia (ASG) or a portion of the ASG population were capable of being incorporated into the genital ridges of the recipients and undergo gametogenesis. Therefore, the use of enriched ASGs can be expected to achieve efficient donor-cell incorporation...
June 22, 2017: Theriogenology
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