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https://www.readbyqxmd.com/read/29055159/genomics-of-natural-populations-evolutionary-forces-that-establish-and-maintain-gene-arrangements-in-drosophila-pseudoobscura
#1
Zachary L Fuller, Gwilym D Haynes, Stephen Richards, Stephen W Schaeffer
The evolution of complex traits in heterogeneous environments may shape the order of genes within chromosomes. Drosophila pseudoobscura has a rich gene arrangement polymorphism that allows one to test evolutionary genetic hypotheses about how chromosomal inversions are established in populations. D. pseudoobscura has >30 gene arrangements on a single chromosome that were generated through a series of overlapping inversion mutations with > 10 inversions with appreciable frequencies and wide geographic distributions...
October 21, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29054639/mobility-of-rare-earth-elements-yttrium-and-scandium-from-a-phosphogypsum-stack-environmental-and-economic-implications
#2
Carlos Ruiz Cánovas, Francisco Macías, Rafael Pérez López, José Miguel Nieto
This paper investigates the mobility and fluxes of REE, Y and Sc under weathering conditions from an anomalously metal-rich phosphogypsum stack in SW Spain. The interactions of the phosphogypsum stack with rainfall and organic matter-rich solutions, simulating the weathering processes observed due to its location on salt-marshes, were simulated by leaching tests (e.g. EN 12457-2 and TCLP). Despite the high concentration of REE, Y and Sc contained in the phosphogypsum stack, their mobility during the leaching tests was very low; <0...
October 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29054490/cd21-lo-med-cd27-proinflammatory-b-cells-are-enriched-in-breast-cancer-patients-and-promote-antitumor-t-cell-responses
#3
Shiguang Zhu, Xingmiao Wang, Ji Wang, Jun Lin, Yizi Cong, Guangdong Qiao
Breast cancer is a common malignancy and a major cause of death in women worldwide. The immunomodulatory role of B cells is being increasingly recognized in autoimmune diseases and cancers. In recent years, immunotherapeutic strategies that upregulate the patient's own antitumor T cell responses have shown promise in treating solid tumors and are being developed for breast cancer. In this study, we discovered that the B cells in breast cancer patients were enriched with interferon (IFN)-γ-expressing cells and presented high potency for IFN-γ production...
October 17, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/29053682/implantation-of-chronic-silicon-probes-and-recording-of-hippocampal-place-cells-in-an-enriched-treadmill-apparatus
#4
Anvar Sariev, Jinho Chung, Dajung Jung, Farnaz Sharif, Ju-Young Lee, Soyoun Kim, Sebastien Royer
An important requisite for understanding brain function is the identification of behavior and cell activity correlates. Silicon probes are advanced electrodes for large-scale electrophysiological recording of neuronal activity, but the procedures for their chronic implantation are still underdeveloped. The activity of hippocampal place cells is known to correlate with an animal's position in the environment, but the underlying mechanisms are still unclear. To investigate place cells, here we describe a set of techniques which range from the fabrication of devices for chronic silicon probe implants to the monitoring of place field activity in a cue-enriched treadmill apparatus...
October 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29052931/far-red-light-promotes-biofilm-formation-in-the-cyanobacterium-acaryochloris-marina
#5
Miguel A Hernández-Prieto, Yaqiong Li, Bradley L Postier, Robert E Blankenship, Min Chen
Light quantity and quality promotes ecological-niche differentiation of photosynthetic organisms. The existence of cyanobacteria capable of performing photosynthesis using red-shifted chlorophylls, chlorophyll d and f, reduces competition between species in light-limiting environments, and permits them to thrive in niches enriched in far-red light. We examined global transcriptome changes due to changing the culture light conditions in Acaryochloris marina, a chlorophyll d-containing cyanobacterium. We identified the functional category of "photosynthesis" as the most down-regulated and the category of "cell wall/membrane biogenesis" as the most up-regulated through a functional enrichment analysis of genes differentially expressed...
October 20, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29052505/transcriptome-assembly-in-suaeda-aralocaspica-to-reveal-the-distinct-temporal-gene-mirna-alterations-between-the-dimorphic-seeds-during-germination
#6
Lei Wang, Hong-Ling Wang, Lan Yin, Chang-Yan Tian
BACKGROUND: Dimorphic seeds from Suaeda aralocaspica exhibit different germination behaviors that are thought to be a bet-hedging strategy advantageous in harsh and unpredictable environments. To understand the molecular mechanisms of Suaeda aralocaspica dimorphic seed germination, we applied RNA sequencing and small RNA sequencing for samples collected at three germination stages. RESULTS: A total of 79,414 transcripts were assembled using Trinity, of which 57...
October 19, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29048992/eurasian-red-squirrels-show-little-seasonal-variation-in-metabolism-in-food-enriched-habitat
#7
James M Turner, Stephanie Reher, Lisa Warnecke, Kathrin H Dausmann
Energy expenditure and ambient temperature (Ta) are intrinsically linked through changes in an animal's metabolic rate. While the nature of this relationship is stable, the breadth of change in thermoregulatory cost varies with body size and physiological acclimatization to season. To explore seasonal metabolic changes of small mammals, we studied a population of Eurasian red squirrels (Sciurus vulgaris) in a seminatural environment with a year-round supply of natural and supplemented food. In each season we measured the metabolic rate of wild-caught red squirrels, using open-flow respirometry, and hypothesized that individuals would make adjustments to contend with seasonal weather conditions...
November 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/29048082/high-temperature-ferroelectric-behaviour-in-%C3%AE-mno2-nanorods-realised-through-enriched-oxygen-vacancy-induced-non-stoichiometry
#8
Reenu Elizabeth John, Anoop Chandran, Justin George, Ajai Jose, Gijo Jose, Joshy Jose, N V Unnikrishnan, Marykutty Thomas, K C George
Nanostructuring followed by incorporation of defect induced non-stoichiometry is an emerging field of prominence due to its capacity to introduce unprecedented properties in materials with potential applications. In this work, crystalline α-MnO2 nanorods are synthesised using a facile co-precipitation method to exhibit ferroelectric behaviour for the first time. The evolution mechanism of the nanorods is investigated using XRD, HRTEM and FTIR spectra, while their thermal stability is probed using TGA/DTA. The novel properties observed are the result of structural rearrangements sparked by electrons in mixed valence cations (Mn(3+)/Mn(4+))...
October 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29045669/genetic-decoupling-of-thermal-hardiness-across-metamorphosis-in-drosophila-melanogaster
#9
Philip J Freda, Jackson T Alex, Theodore J Morgan, Gregory J Ragland
As organisms age the environment fluctuates, exerting differential selection across ontogeny. In particular, highly seasonal environments expose life stages to often drastically different thermal environments. This developmental variation is particularly striking in organisms with complex life cycles, wherein life history stages also exhibit distinct morphologies, physiologies, and behaviors. Genes acting pleiotropically on thermal responses may produce genetic correlations across ontogeny, constraining the independent evolution of each life stage to their respective thermal environments...
October 16, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/29045485/alterations-in-the-placental-methylome-with-maternal-obesity-and-evidence-for-metabolic-regulation
#10
Kohzoh Mitsuya, Ashley N Parker, Lu Liu, Jianhua Ruan, Margreet C M Vissers, Leslie Myatt
The inflammatory and metabolic derangements of obesity in pregnant women generate an adverse intrauterine environment, increase pregnancy complications and adverse fetal outcomes and program the fetus for obesity and metabolic syndrome in later life. We hypothesized that epigenetic modifications in placenta including altered DNA methylation/hydroxymethylation may mediate these effects. Term placental villous tissue was collected following cesarean section from lean (prepregnancy BMI<25) or obese (BMI>30) women...
2017: PloS One
https://www.readbyqxmd.com/read/29040792/future-of-days-past-neurodevelopment-and-schizophrenia
#11
Daniel R Weinberger
Since a proposal in 1986 that schizophrenia involved early neurodevelopmental deviations beginning in intrauterine life that showed varying expressivity as relevant neural systems matured, our understanding of the developmental components of the pathogenesis of schizophrenia has substantially evolved. This commentary highlights recent genetic and epigenetic evidence that prenatal development is a critical period for the expression of schizophrenia risk. Studies of gene expression have been fairly consistent in showing that genes implicated in schizophrenia show relatively greater expression during fetal than postnatal life...
October 11, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/29040506/high-throughput-sequencing-revealed-novel-dehalococcoidia-in-dechlorinating-microbial-enrichments-from-pcb-contaminated-marine-sediments
#12
B Matturro, E Frascadore, S Rossetti
In this study six PCE-to-ethene dechlorinating cultures, fed with a fermentable substrate (lactate) or hydrogen as electron donor, were obtained from PCB and PCE dechlorinating microcosms constructed with PCB contaminated marine sediments.A novel Chloroflexi member (OTU-DIS1) affiliated to Dehalococcoidales Incertae Sedis, only distantly related to known dechlorinating bacteria, dominated the enrichment cultures (up to 86% of total OTUs). Sulfate-, thiosulfate- and sulfur-reducing bacteria affiliated to genera Desulfobacter, Dethiosulfatibacter and Desulfuromusa were also found to lesser extent...
October 11, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29039500/gene-expression-profile-identifies-potential-biomarkers-for-human-intervertebral-disc-degeneration
#13
Wei Guo, Bin Zhang, Yan Li, Hui-Quan Duan, Chao Sun, Yun-Qiang Xu, Shi-Qing Feng
The present study aimed to reveal the potential genes associated with the pathogenesis of intervertebral disc degeneration (IDD) by analyzing microarray data using bioinformatics. Gene expression profiles of two regions of the intervertebral disc were compared between patients with IDD and controls. GSE70362 containing two groups of gene expression profiles, 16 nucleus pulposus (NP) samples from patients with IDD and 8 from controls, and 16 annulus fibrosus (AF) samples from patients with IDD and 8 from controls, was downloaded from the Gene Expression Omnibus database...
October 9, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29038218/experiential-learning-in-rodents-past-experience-enables-rapid-learning-and-localized-encoding-in-hippocampus
#14
Conor D Cox, Linda C Palmer, Danielle T Pham, Brian H Trieu, Christine M Gall, Gary Lynch
Humans routinely use past experience with complexity to deal with novel, challenging circumstances. This fundamental aspect of real-world behavior has received surprisingly little attention in animal studies, and the underlying brain mechanisms are unknown. The present experiments tested for transfer from past experience in rats and then used quantitative imaging to localize synaptic modifications in hippocampus. Six daily exposures to an enriched environment (EE) caused a marked enhancement of short- and long-term memory encoded during a 30-min session in a different and complex environment relative to rats given extensive handling or access to running wheels...
November 2017: Learning & Memory
https://www.readbyqxmd.com/read/29037237/the-role-of-national-registries-in-improving-patient-safety-for-hip-and-knee-replacements
#15
Anne Lübbeke, Alan J Silman, Daniel Prieto-Alhambra, Amanda I Adler, Christophe Barea, Andrew J Carr
BACKGROUND: The serious adverse events associated with metal on metal hip replacements have highlighted the importance of improving methods for monitoring surgical implants. The new European Union (EU) device regulation will enforce post-marketing surveillance based on registries among other surveillance tools. Europe has a common regulatory environment, a common market for medical devices, and extensive experience with joint replacement registries. In this context, we elaborate how joint replacement registries, while building on existing structure and data, can better ensure safety and balance risks and benefits...
October 16, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29036179/extreme-strontium-concentrations-reveal-specific-biomineralization-pathways-in-certain-coccolithophores-with-implications-for-the-sr-ca-paleoproductivity-proxy
#16
Michaël Hermoso, Benjamin Lefeuvre, Fabrice Minoletti, Marc de Rafélis
The formation of the coccolith biominerals by a group of marine algae (the Coccolithophores) offers fascinating research avenues both from the biological and geological sides. It is surprising how biomineralisation by a key phytoplanktonic group remains underconstrained, yet is influential on ocean alkalinity and responsible for the built up of our paleoclimatic archive over the last 200 Myrs. Here, we report two close relative coccolith taxa exhibiting substantial bioaccumulation of strontium: Scyphosphaera and Pontosphaera grown in the laboratory or retrieved from Pliocene sediments...
2017: PloS One
https://www.readbyqxmd.com/read/29035796/characterization-of-iron-and-manganese-minerals-and-their-associated-microbiota-in-different-mine-sites-to-reveal-the-potential-interactions-of-microbiota-with-mineral-formation
#17
Jin Hee Park, Bong-Soo Kim, Chul-Min Chon
Different environmental conditions such as pH and dissolved elements of mine stream induce precipitation of different minerals and their associated microbial community may vary. Therefore, mine precipitates from various environmental conditions were collected and their associated microbiota were analyzed through metagenomic DNA sequencing. Various Fe and Mn minerals including ferrihydrite, schwertmannite, goethite, birnessite, and Mn-substituted δ-FeOOH (δ-(Fe1-x, Mnx)OOH) were found in the different environmental conditions...
October 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/29035349/design-of-research-on-performance-of-a-new-iridium-coordination-compound-for-the-detection-of-hg-2
#18
Hailing Ma, Sang-Bing Tsai
Heavy metal pollution has become one of the most significant pollution problems encountered by our country in terms of environment protection. In addition to the significant effects of heavy metals on the human body and other organisms through water, food chain enrichment and other routes, heavy metals involved in daily necessities beyond the level limit could also affect people's lives, so the detection of heavy metals is extremely important. Ir (III) coordination compound, considered to be one of the best phosphorescent sensing materials, is characterized by high luminous efficiency, easy modification of the ligand and so on, and it has potential applications in the field of heavy metal detection...
October 16, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29033917/newly-isolated-bacteriophages-from-the-podoviridae-siphoviridae-and-myoviridae-families-have-variable-effects-on-putative-novel-dickeya-spp
#19
Špela Alič, Tina Naglič, Magda Tušek-Žnidarič, Maja Ravnikar, Nejc Rački, Matjaž Peterka, Tanja Dreo
Soft rot pathogenic bacteria from the genus Dickeya cause severe economic losses in orchid nurseries worldwide, and there is no effective control currently available. In the last decade, the genus Dickeya has undergone multiple changes as multiple new taxa have been described, and just recently a new putative Dickeya species was reported. This study reports the isolation of three bacteriophages active against putative novel Dickeya spp. isolates from commercially produced infected orchids that show variable host-range profiles...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29032469/itraq-based-proteomic-profiling-of-a-microbacterium-sp-strain-during-benzo-a-pyrene-removal-under-anaerobic-conditions
#20
Junfeng Dou, Wei Qin, Aizhong Ding, Xiang Liu, Yi Zhu
This study focused on the protein expression of a Microbacterium sp. strain that utilized various concentrations of benzo(a)pyrene (BaP) as the sole source of carbon and energy under anaerobic conditions. A total of 1539 protein species were quantified by isobaric tags for relative and absolute quantitation (iTRAQ) coupled with LC-MS/MS. GO, COG, and pathway enrichment analysis showed that most proteins demonstrated catalytic and binding functions and were mainly involved in metabolic processes, cellular processes, and single-organism processes...
October 14, 2017: Applied Microbiology and Biotechnology
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