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https://www.readbyqxmd.com/read/28823016/de-novo-synthesis-of-linoleic-acid-in-multiple-collembola-species
#1
Miriama Malcicka, Joachim Ruther, Jacintha Ellers
Many ecological interactions in communities take place between consumers and the organisms they feed on. Continuous surplus of specific nutritional compounds in the diet may lead to evolutionary changes in the metabolic capacity of the consumer, leaving the biosynthesis of such compounds prone to genetic decay and render organisms auxotrophic. A nutrient that is essential to many organisms is the unsaturated fatty acid, linoleic acid (LA; 18:2n-6), which is important in the maintenance of cell membrane fluidity and as a precursor for signaling molecules...
August 19, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28822908/pseudophyllomitus-vesiculosus-larsen-and-patterson-1990-lee-2002-a-poorly-studied-phagotrophic-biflagellate-is-the-first-characterized-member-of-stramenopile-environmental-clade-mast-6
#2
Takashi Shiratori, Rabindra Thakur, Ken-Ichiro Ishida
There are many eukaryotic lineages that are exclusively composed of environmental sequences and lack information about which species are included. Regarding stramenopiles, at least 18 environmental lineages, known as marine stramenopiles (MAST), have been recognized. Since each MAST lineage forms deep branches in the stramenopiles, the characterization of MAST members is key to understanding the diversity and evolution of stramenopiles. In this study, we established a culture of Pseudophyllomitus vesiculosus, which is a poorly studied phagotrophic flagellate of uncertain taxonomic position...
July 6, 2017: Protist
https://www.readbyqxmd.com/read/28822812/determinants-of-thermostability-in-the-cytochrome-p450-fold
#3
REVIEW
Kurt L Harris, Raine E S Thomson, Silja J Strohmaier, Yosephine Gumulya, Elizabeth M J Gillam
Cytochromes P450 are found throughout the biosphere in a wide range of environments, serving a multitude of physiological functions. The ubiquity of the P450 fold suggests that it has been co-opted by evolution many times, and likely presents a useful compromise between structural stability and conformational flexibility. The diversity of substrates metabolized and reactions catalyzed by P450s makes them attractive starting materials for use as biocatalysts of commercially useful reactions. However, process conditions impose different requirements on enzymes to those in which they have evolved naturally...
August 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28822777/managing-the-course-of-diabetic-kidney-disease-from-the-old-to-the-new
#4
REVIEW
Ronald M Goldenberg, Murray Berall, Christopher T M Chan, David Z I Cherney, Julie A Lovshin, Philip A McFarlane, Peter A Senior, Subodh Verma, Jordan J Weinstein
Diabetic kidney disease (DKD) is a group of chronic kidney diseases that is associated with significant cardiovascular as well as all-cause morbidity and mortality. Although DKD is often progressive in nature, its evolution can be modified by intensive management of glycemia and blood pressure and inhibition of the renin-angiotensin-aldosterone system. This review provides an overview of how multifactorial interventions can provide renal protection and includes a discussion of the nonglycemic effects of incretin-based diabetes therapies (glucagon-like peptide-1 receptor agonists and dipeptidyl peptidase 4 inhibitors) and sodium-glucose cotransporter-2 inhibitors within the kidney in patients with type 2 diabetes...
August 16, 2017: Canadian Journal of Diabetes
https://www.readbyqxmd.com/read/28822767/eurostemcell-a-european-infrastructure-for-communication-and-engagement-with-stem-cell-research
#5
REVIEW
Jan Barfoot, Kate Doherty, C Clare Blackburn
EuroStemCell is a large and growing network of organizations and individuals focused on public engagement with stem cells and regenerative medicine - a fluid and contested domain, where scientific, political, ethical, legal and societal perspectives intersect. Rooted in the European stem cell research community, this project has developed collaborative and innovative approaches to information provision and direct and online engagement, that reflect and respond to the dynamic growth of the field itself. EuroStemCell started as the communication and outreach component of a research consortium and subsequently continued as a stand-alone engagement initiative...
August 16, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28822699/extent-and-evolution-of-gene-duplication-in-dna-viruses
#6
Yuxia Gao, Huayao Zhao, Yin Jin, Xiaoyu Xu, Guan-Zhu Han
Gene duplication is the main source of genomic novelties and complexities for both eukaryotes and prokaryotes. In contrast, gene duplication appears to be infrequent in the RNA viruses. However, the extent and evolution of gene duplication in DNA viruses remains obscure. Here we perform a genome-wide analysis of gene duplication in the genomes of 250 DNA viruses that represent all known DNA viral genera. While no gene duplication event is identified in single stranded DNA (ssDNA) or reverse transcribing DNA viruses, gene duplication is frequent among double stranded DNA (dsDNA) viruses...
August 16, 2017: Virus Research
https://www.readbyqxmd.com/read/28822651/the-evolution-of-myocardial-infarction-when-the-truths-we-hold-to-be-self-evident-no-longer-have-evidence
#7
EDITORIAL
David D Waters, Sripal Bangalore
No abstract text is available yet for this article.
July 10, 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/28822613/biomass-ash-reutilisation-as-an-additive-in-the-composting-process-of-organic-fraction-of-municipal-solid-waste
#8
Carla Asquer, Giovanna Cappai, Giorgia De Gioannis, Aldo Muntoni, Martina Piredda, Daniela Spiga
In this work the effects of selected types of biomass ash on the composting process and final product quality were studied by conducting a 96-day long experiment where the source separated organic fraction of municipal waste, mixed with wood prunings that served as bulking agent, was added with 0%, 2%, 4% and 8% wt/wt of biomass ash. The evolution over time of the main process parameters was observed, and the final composts were characterised. On the basis of the results, both the composting process and the quality of the final product were improved by ash addition...
August 16, 2017: Waste Management
https://www.readbyqxmd.com/read/28822588/characterization-of-reactive-flow-induced-evolution-of-carbonate-rocks-using-digital-core-analysis-part-2-calculation-of-the-evolution-of-percolation-and-transport-properties
#9
Jafar Qajar, Christoph H Arns
Percolation of reactive fluids in carbonate rocks affects the rock microstructure and hence changes the rock macroscopic properties. In Part 1 paper, we examined the voxel-wise evolution of microstructure of the rock in terms of mineral dissolution/detachment, mineral deposition, and unchanged regions. In the present work, we investigate the relationships between changes in two characteristic transport properties, i.e. permeability and electrical conductivity and two critical parameters of the pore phase, i...
August 12, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28822498/editorial-overview-pests-and-resistance-shedding-the-albatross-of-resistance-starts-by-embracing-the-ecological-complexities-of-its-evolution
#10
EDITORIAL
Thomas Wilson Sappington, Nicholas J Miller
No abstract text is available yet for this article.
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28822493/interactions-between-bee-foraging-and-floral-resource-phenology-shape-bee-populations-and-communities
#11
REVIEW
Jane E Ogilvie, Jessica Rk Forrest
Flowers are ephemeral, yet bees rely on them for food throughout their lives. Floral resource phenology - which can be altered by changes in climate and land-use - is therefore key to bee fitness and community composition. Here, we discuss the interactions between floral resource phenology, bee foraging behaviour, and traits such as diet breadth, sociality, and body size. Recent research on bumble bees has examined behavioural responses to local floral turnover and effects of landscape-scale floral resource phenology on fitness, abundance, and foraging distances...
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28822491/role-of-dispersal-in-resistance-evolution-and-spread
#12
REVIEW
Nicholas J Miller, Thomas W Sappington
Gene flow via immigration affects rate of evolution of resistance to a pest management tactic, while emigration from a resistant population can spread resistance alleles spatially. Whether resistance detected across the landscape reflects ongoing de novo evolution in different hotspots or spread from a single focal population can determine the most effective mitigation strategy. Pest dispersal dynamics determine the spatio-temporal scale at which mitigation tactics must be applied to contain or reverse resistance in an area...
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28822489/evolution-of-host-resistance-to-insect-pathogens
#13
REVIEW
Jenny S Cory
Insect pathogens are widely used as a tool for sustainable pest management. Their complex mode of action was thought to make them immune to the evolution of resistance; however, several examples of field-based resistance to the bacterium Bacillus thuringiensis and a granulovirus have been recorded. Here I review the scenarios where resistance has evolved and discuss the likelihood of it occurring in other entomopathogens. I highlight recent research on the factors which might influence the evolution of resistance to insect pathogens, including the role of pathogen diversity, host nutrition and transgenerational effects...
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28822487/does-resistance-really-carry-a-fitness-cost
#14
REVIEW
Richard H Ffrench-Constant, Chris Bass
Insecticide resistance mutations are widely assumed to carry fitness costs. However studies to measure such costs are rarely performed on genetically related strains and are often only done in the laboratory. Theory also suggests that once evolved the cost of resistance can be offset by the evolution of fitness modifiers. But for insecticide resistance only one such example is well documented. Here we critically examine the literature on fitness costs in the absence of pesticide and ask if our knowledge of molecular biology has helped us predict the costs associated with different resistance mechanisms...
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28822486/adaptation-to-toxic-hosts-as-a-factor-in-the-evolution-of-insecticide-resistance
#15
REVIEW
Andrei Alyokhin, Yolanda H Chen
Insecticide resistance is a serious economic problem that jeopardizes sustainability of chemical control of herbivorous insects and related arthropods. It can be viewed as a specific case of adaptation to toxic chemicals, which has been driven in large part, but not exclusively, by the necessity for insect pests to tolerate defensive compounds produced by their host plants. Synthetic insecticides may simply change expression of specific sets of detoxification genes that have evolved due to ancestral associations with host plants...
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28822366/trauma-associated-abdominal-cocoon-demonstration-of-radiographic-evolution
#16
Morgan A Brown, Brooke Schermerhorn, Cassandra White, William Bates
No abstract text is available yet for this article.
August 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/28822358/the-evolution-of-trauma-care-relative-mortality-analysis-at-a-level-1-trauma-center-over-two-decades
#17
Michael H Luu, Christopher L Cramer, Melanie N Cabezas, Luke Soshnik-Schierling, William F Barnhardt, Jeffrey S Young
No abstract text is available yet for this article.
August 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/28822280/promiscuity-impersonation-and-accommodation-evolution-of-plant-specialized-metabolism
#18
REVIEW
Bryan J Leong, Robert L Last
Specialized metabolic enzymes and metabolite diversity evolve through a variety of mechanisms including promiscuity, changes in substrate specificity, modifications of gene expression and gene duplication. For example, gene duplication and substrate binding site changes led to the evolution of the glucosinolate biosynthetic enzyme, AtIPMDH1, from a Leu biosynthetic enzyme. BAHD acyltransferases illustrate how enzymatic promiscuity leads to metabolite diversity. The examples 4-coumarate:CoA ligase and aromatic acid methyltransferases illustrate how promiscuity can potentiate the evolution of these specialized metabolic enzymes...
August 16, 2017: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/28822138/light-microscopy-transmission-electron-microscopy-and-immunohistochemistry-protocols-for-studying-photorespiration
#19
Roxana Khoshravesh, Vanessa Lundsgaard-Nielsen, Stefanie Sultmanis, Tammy L Sage
High-resolution images obtained from plant tissues processed for light microscopy, transmission electron microscopy, and immunohistochemistry have provided crucial links between plant subcellular structure and physiology during photorespiration as well as the impact of photorespiration on plant evolution and development. This chapter presents established protocols to guide researchers in the preparation of plant tissues for high-resolution imaging with a light and transmission electron microscope and detection of proteins using immunohistochemistry...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28822064/evolution-of-29-anthropometric-nutritional-and-cardiometabolic-parameters-among-morbidly-obese-adolescents-2-years-post-sleeve-gastrectomy
#20
Wahiba Elhag, Walid El Ansari, Sama Abdulrazzaq, Ali Abdullah, Mohamed Elsherif, Israa Elgenaied
BACKGROUND: Laparoscopic sleeve gastrectomy (LSG) is a popular treatment for adolescent morbid obesity. Research on LSG outcomes among adolescents assessed a narrow range of anthropometric, nutritional, or cardiometabolic parameters, leading to an incomplete picture of these changes. We examined a wide variety of anthropometric, nutritional, and cardiometabolic parameters among adolescents before and after LSG. METHODS: We retrospectively reviewed medical charts of all obese adolescents who underwent LSG at Hamad Medical Corporation, Qatar, between January 2011 and June 2015 (N = 102)...
August 18, 2017: Obesity Surgery
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