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https://www.readbyqxmd.com/read/28241610/using-sub-resolution-features-for-self-compensation-of-the-modulation-transfer-function-in-remote-sensing
#1
Jin Li, Zilong Liu, Fengdeng Liu
Space smart optical orbiting payloads integrated with attitude and position (SSPIAP) are emerging as an essential tool that is extensively used in microsatellites. The on-orbit imaging link of SSPIAPs includes atmospheric disturbances, defocusing, and relative motion, and other noises, thereby resulting in low modulation transfer function (MTF) and poor image quality. The introduction of MTF compensations has pushed the limits of optical imaging, enabling high-resolution on-orbit dynamic imaging. However, the external targets for compensating MTF are limited by space and time because the availability and access to external targets are infrequently easy when a remote sensor is working on-orbit...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28241389/temperature-fine-tunes-mediterranean-arabidopsis-thaliana-life-cycle-phenology-geographically
#2
A Marcer, D S Vidigal, P M A James, M-J Fortin, B Méndez-Vigo, H W M Hilhorst, L Bentsink, C Alonso-Blanco, F X Picó
To understand how adaptive evolution in life-cycle phenology operates in plants, we need to unravel the effects of geographical variation in putative agents of natural selection on life-cycle phenology by considering all key developmental transitions and their co-variation patterns. We address this goal by quantifying the temperature-driven and geographically varying relationship between seed dormancy and flowering time in the annual Arabidopsis thaliana across the Iberian Peninsula. We used data on genetic variation in two major life-cycle traits, seed dormancy (DSDS50) and flowering time (FT), in a collection of 300 A...
February 27, 2017: Plant Biology
https://www.readbyqxmd.com/read/28241378/an-experimental-test-of-fitness-variation-across-a-hydrologic-gradient-predicts-willow-and-poplar-species-distributions
#3
Xiaojing Wei, Jessica A Savage, Charlotte E Riggs, Jeannine Cavender-Bares
Environmental filtering is an important community assembly process influencing species distributions. Contrasting species abundance patterns along environmental gradients are commonly used to provide evidence for environmental filtering. However, the same abundance patterns may result from alternative or concurrent assembly processes. Experimental tests are an important means to decipher whether species fitness varies with environment, in the absence of dispersal constraints and biotic interactions, and to draw conclusions about the importance of environmental filtering in community assembly...
February 27, 2017: Ecology
https://www.readbyqxmd.com/read/28240398/standardization-of-a-videofluoroscopic-swallow-study-protocol-to-investigate-dysphagia-in-dogs
#4
R A Harris, M E Grobman, M J Allen, J Schachtel, N E Rawson, B Bennett, J Ledyayev, B Hopewell, J R Coates, C R Reinero, T E Lever
BACKGROUND: Videofluoroscopic swallow study (VFSS) is the gold standard for diagnosis of dysphagia in veterinary medicine but lacks standardized protocols that emulate physiologic feeding practices. Age impacts swallow function in humans but has not been evaluated by VFSS in dogs. HYPOTHESIS/OBJECTIVES: To develop a protocol with custom kennels designed to allow free-feeding of 3 optimized formulations of contrast media and diets that address limitations of current VFSS protocols...
February 27, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28240377/interaction-intensity-and-pollinator-mediated-selection
#5
Judith Trunschke, Nina Sletvold, Jon Ågren
In animal-pollinated plants, the opportunity for selection and the strength of pollinator-mediated selection are expected to increase with the degree of pollen limitation. However, whether differences in pollen limitation can explain variation in pollinator-mediated and net selection among animal-pollinated species is poorly understood. In the present study, we quantified pollen limitation, variance in relative fitness and pollinator-mediated selection on five traits important for pollinator attraction (flowering start, plant height, flower number, flower size) and pollination efficiency (spur length) in natural populations of 12 orchid species...
February 27, 2017: New Phytologist
https://www.readbyqxmd.com/read/28239373/variations-of-soil-microbial-community-structures-beneath-broadleaved-forest-trees-in-temperate-and-subtropical-climate-zones
#6
Sihang Yang, Yuguang Zhang, Jing Cong, Mengmeng Wang, Mengxin Zhao, Hui Lu, Changyi Xie, Caiyun Yang, Tong Yuan, Diqiang Li, Jizhong Zhou, Baohua Gu, Yunfeng Yang
Global warming has shifted climate zones poleward or upward. However, understanding the responses and mechanism of microbial community structure and functions relevant to natural climate zone succession is challenged by the high complexity of microbial communities. Here, we examined soil microbial community in three broadleaved forests located in the Wulu Mountain (WLM, temperate climate), Funiu Mountain (FNM, at the border of temperate and subtropical climate zones), or Shennongjia Mountain (SNJ, subtropical climate)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28239365/characterizing-early-maternal-style-in-a-population-of-guide-dogs
#7
Emily E Bray, Mary D Sammel, Dorothy L Cheney, James A Serpell, Robert M Seyfarth
In both humans and non-humans, differences in maternal style during the first few weeks of life can be reliably characterized, and these differences affect offspring's temperament and cognition in later life. Drawing on the breeding population of dogs at The Seeing Eye, a guide dog school in Morristown, New Jersey, we conducted videotaped focal follows on 21 mothers and their litters (n = 138 puppies) over the first 3 weeks of the puppies' lives in an effort to characterize maternal style. We found that a mother's attitude and actions toward her offspring varied naturally between individuals, and that these variations could be summarized by a single principal component, which we described as Maternal behavior...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28239149/timing-and-nature-of-amoc-recovery-across-termination-2-and-magnitude-of-deglacial-co2-change
#8
Emily L Deaney, Stephen Barker, Tina van de Flierdt
Large amplitude variations in atmospheric CO2 were associated with glacial terminations of the Late Pleistocene. Here we provide multiple lines of evidence suggesting that the ∼20 p.p.m.v. overshoot in CO2 at the end of Termination 2 (T2) ∼129 ka was associated with an abrupt (≤400 year) deepening of Atlantic Meridional Overturning Circulation (AMOC). In contrast to Termination 1 (T1), which was interrupted by the Bølling-Allerød (B-A), AMOC recovery did not occur until the very end of T2, and was characterized by pronounced formation of deep waters in the NW Atlantic...
February 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28238550/diverse-non-genetic-allele-specific-expression-effects-shape-genetic-architecture-at-the-cellular-level-in-the-mammalian-brain
#9
Wei-Chao Huang, Elliott Ferris, Tong Cheng, Cornelia Stacher Hörndli, Kelly Gleason, Carol Tamminga, Janice D Wagner, Kenneth M Boucher, Jan L Christian, Christopher Gregg
Interactions between genetic and epigenetic effects shape brain function, behavior, and the risk for mental illness. Random X inactivation and genomic imprinting are epigenetic allelic effects that are well known to influence genetic architecture and disease risk. Less is known about the nature, prevalence, and conservation of other potential epigenetic allelic effects in vivo in the mouse and primate brain. Here we devise genomics, in situ hybridization, and mouse genetics strategies to uncover diverse allelic effects in the brain that are not caused by imprinting or genetic variation...
February 18, 2017: Neuron
https://www.readbyqxmd.com/read/28238486/spatial-variation-in-polycyclic-aromatic-hydrocarbon-exposure-in-barrow-s-goldeneye-bucephala-islandica-in-coastal-british-columbia
#10
Megan Willie, Daniel Esler, W Sean Boyd, Philip Molloy, Ronald C Ydenberg
Barrow's goldeneyes are sea ducks that winter throughout coastal British Columbia (BC). Their diet consists primarily of intertidal blue mussels, which can accumulate PAHs; accordingly, goldeneyes may be susceptible to exposure through contaminated prey. In 2014/15, we examined total PAH concentrations in mussels from undeveloped and developed coastal areas of BC. At those same sites, we used EROD to measure hepatic CYP1A induction in goldeneyes. We found higher mussel PAH concentrations at developed coastal sites...
February 23, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28238432/impact-of-irrigation-based-sugarcane-cultivation-on-the-chiredzi-and-runde-rivers-quality-zimbabwe
#11
Tamuka Nhiwatiwa, Tatenda Dalu, Luc Brendonck
Agriculture is vital in sustaining human livelihoods. However, agriculture as it is currently practiced, is contributing to the degradation of freshwater ecosystems globally. We investigated impacts of irrigation return flows from sugarcane farming on water quality and health status of the Chiredzi and Runde Rivers, a biodiversity hotspot region in south-eastern Lowveld of Zimbabwe. The water quality at inlets from the crop field into the wetland system; wetland outlets into the river systems; and river sites upstream and downstream of wetland outlets were monitored during the dry and wet seasons...
February 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28238020/haploid-embryo-production-in-rice-and-maize-induced-by-psasgr-bbml-transgenes
#12
Joann A Conner, Maricel Podio, Peggy Ozias-Akins
The PsASGR - BBML transgene, derived from a wild apomictic grass species, can induce parthenogenesis, embryo formation without fertilization, in rice and maize, leading to the formation of haploid plants. The ability to engineer apomictic crop plants using genes identified from naturally occurring apomicts will depend on the ability of those genes to function in crop plants. The PsASGR-BBML transgene, derived from the apomictic species Pennisetum squamulatum, promotes parthenogenesis in sexual pearl millet, a member of the same genus, leading to the formation of haploid embryos...
February 25, 2017: Plant Reproduction
https://www.readbyqxmd.com/read/28236043/cystic-fibrosis-in-austria
#13
Thomas Frischer, Ernst Eber, Helmut Ellemunter, Angela Zacharasiewicz, Ingrid Kaluza, Josef Riedler, Sabine Renner
Registry data for patients with cystic fibrosis (CF) are increasingly used to evaluate the natural history, for benchmarking of therapy and in order to identify eligible patients for clinical studies. So far, no data on frequency and clinical status of CF patients have been available for Austria on a national level. We collected data of CF patients treated 2014 in Austrian CF outpatient clinics by means of a European CF registry and on an individual search basis. A total of 773 CF patients with a median age of 18...
February 24, 2017: Wiener Klinische Wochenschrift
https://www.readbyqxmd.com/read/28235827/genomic-data-quality-impacts-automated-detection-of-lateral-gene-transfer-in-fungi
#14
Pierre-Yves Dupont, Murray P Cox
Lateral gene transfer (or horizontal gene transfer), an atypical mechanism of transferring genes between species, has almost become the default explanation for genes that display an unexpected composition or phylogeny. Numerous methods of detecting lateral gene transfer events all rely on two fundamental strategies: primary structure composition or gene tree/species tree comparisons. Discouragingly, the results of these different approaches rarely coincide. With the wealth of genome data now available, detection of laterally transferred genes is increasingly being attempted in large uncurated eukaryotic datasets...
February 24, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28231407/co-occurrence-and-hybridization-of-anther-smut-pathogens-specialized-on-dianthus-hosts
#15
Elsa Petit, Casey Silver, Amandine Cornille, Pierre Gladieux, Lisa Rosenthal, Emily Bruns, Sarah Yee, Janis Antonovics, Tatiana Giraud, Michael E Hood
Host specialization has important consequences for the diversification and ecological interactions of obligate pathogens. The anther-smut disease of natural plant populations, caused by Microbotryum fungi, has been characterized by specialized host-pathogen interactions, which contribute in part to the isolation among these numerous fungal species. This study investigated the molecular variation of Microbotryum pathogens within the geographic and host-specific distributions on wild Dianthus species in southern European Alps...
February 23, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28231327/functionally-focused-algorithmic-analysis-of-high-resolution-microarray-cgh-genomic-landscapes-demonstrates-comparable-genomic-copy-number-aberrations-in-msi-and-mss-sporadic-colorectal-cancer
#16
Hamad Ali, Milad S Bitar, Ashraf Al Madhoun, Makia Marafie, Fahd Al-Mulla
Array-based comparative genomic hybridization (aCGH) emerged as a powerful technology for studying copy number variations at higher resolution in many cancers including colorectal cancer. However, the lack of standardized systematic protocols including bioinformatic algorithms to obtain and analyze genomic data resulted in significant variation in the reported copy number aberration (CNA) data. Here, we present genomic aCGH data obtained using highly stringent and functionally relevant statistical algorithms from 116 well-defined microsatellites instable (MSI) and microsatellite stable (MSS) colorectal cancers...
2017: PloS One
https://www.readbyqxmd.com/read/28231154/natural-chemical-composition-of-commercial-fish-species-characterisation-of-pangasius-wild-and-farmed-turbot-and-barramundi
#17
Monika Manthey-Karl, Ines Lehmann, Ute Ostermeyer, Ute Schröder
To comply with the relevant legal requirements and correct labelling, it is necessary for business operators and inspection authorities to know the natural characteristics of the raw material. This study gives a comprehensive overview of muscle flesh composition of farmed and wild Atlantic turbot (Scophthalmus maximus) and barramundi (Lates calcarifer) and of farmed pangasius (Pangasianodon hypophthalmus). The proximate composition, di- and triphosphates and citric acid values are presented in order to evaluate possible indicators for a hidden treatment during processing to fillets...
August 30, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28230418/effect-of-age-on-attentional-control-in-dual-tasking
#18
Bianca Bier, Nick Corriveau Lecavalier, Dominique Malenfant, Isabelle Peretz, Sylvie Belleville
: Background/Study Context: The age-related differences in divided attention and attentional control have been associated with several negative outcomes later in life. However, numerous questions remain unanswered regarding the nature of these age differences and the role of attentional control abilities in dual-tasking. The aim of this study was to evaluate the sources for age differences in dual-tasking and more specifically: (1) whether they occur because of differences in attentional control skills, or (2) whether the age-related decrement in dual-tasking is due to a general resource reduction that would affect the ability to complete any demanding task...
March 2017: Experimental Aging Research
https://www.readbyqxmd.com/read/28230127/theory-of-chaotic-orbital-variations-confirmed-by-cretaceous-geological-evidence
#19
Chao Ma, Stephen R Meyers, Bradley B Sageman
Variations in the Earth's orbit and spin vector are a primary control on insolation and climate; their recognition in the geological record has revolutionized our understanding of palaeoclimate dynamics, and has catalysed improvements in the accuracy and precision of the geological timescale. Yet the secular evolution of the planetary orbits beyond 50 million years ago remains highly uncertain, and the chaotic dynamical nature of the Solar System predicted by theoretical models has yet to be rigorously confirmed by well constrained (radioisotopically calibrated and anchored) geological data...
February 22, 2017: Nature
https://www.readbyqxmd.com/read/28229967/genetic-architecture-of-seed-longevity-in-bread-wheat-triticum-aestivum-l
#20
Mian Abdur Rehman Arif, Manuela Nagel, Ulrike Lohwasser, Andreas Borner
The deterioration in the quality of ex situ conserved seed over time reflects a combination of both physical and chemical changes. Intraspecific variation for longevity is, at least in part, under genetic control. Here, the grain of 183 bread wheat accessions maintained under low-temperature storage at the IPK-Gatersleben genebank over some decades have been tested for their viability, along with that of fresh grain subjected to two standard artificial ageing procedures. A phenotype-genotype association analysis, conducted to reveal the genetic basis of the observed variation between accessions, implicated many regions of the genome, underling the genetic complexity of the trait...
March 2017: Journal of Biosciences
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