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https://www.readbyqxmd.com/read/29155739/standardized-method-for-high-throughput-sterilization-of-arabidopsis-seeds
#1
Benson E Lindsey, Luz Rivero, Chistopher S Calhoun, Erich Grotewold, Jelena Brkljacic
Arabidopsis thaliana (Arabidopsis) seedlings often need to be grown on sterile media. This requires prior seed sterilization to prevent the growth of microbial contaminants present on the seed surface. Currently, Arabidopsis seeds are sterilized using two distinct sterilization techniques in conditions that differ slightly between labs and have not been standardized, often resulting in only partially effective sterilization or in excessive seed mortality. Most of these methods are also not easily scalable to a large number of seed lines of diverse genotypes...
October 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29154069/nigella-sativa-improves-glucose-homeostasis-and-serum-lipids-in-type-2-diabetes-a-systematic-review-and-meta-analysis
#2
REVIEW
Reza Daryabeygi-Khotbehsara, Mahdieh Golzarand, Mohammad Payam Ghaffari, Kurosh Djafarian
BACKGROUND & OBJECTIVE(S): Global prevalence of type 2 diabetes (T2D) is very high and is currently growing alarmingly. With respect to recent researchers' attention to the potential role of herbal medicine in disease prevention and management, the present meta-analysis review investigates the effectiveness of Nigella sativa (N. sativa), a popular herb, in T2D. METHODS: Literature search was conducted covering PubMed/Medline, Scopus, and Cochrane Registry of Clinical Trials up to February 2017 to obtain the relevant published intervention studies...
December 2017: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/29152199/effect-of-pollen-and-resource-limitation-on-reproduction-of-zygophyllum-xanthoxylum-in-fragmented-habitats
#3
Min Chen, Xue-Yong Zhao
Limitations on pollen and resources may significantly affect plant reproduction in fragmented habitats. In this study, phenology and pollinator frequency and activity were investigated to estimate the role of pollinators in Zygophyllum xanthoxylum reproduction, and this species is ecologically important in northwest China. In addition, the relative impact of restrictive amounts of pollen and resources on the seed set per flower was evaluated. It was found that adding pollen boosted the size of the seed set per flower, but had no significant effect on the number of flowers...
November 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29149559/core-shell-microstructure-induced-synergistic-effect-for-efficient-water-droplet-formation-and-cloud-seeding-application
#4
Yanlong Tai, Haoran Liang, Nabil El Hadri, Ali M Abshaev, Buzgigit M Huchinaev, Steve Griffiths, Mustapha Jouiad, Linda Zou
Cloud-seeding materials as a promising water-augmentation technology have drawn more attention recently. We designed and synthesized a novel type of core/shell NaCl/TiO2 (CSNT) particles with controlled particle size, which successfully adsorbed more water vapor (~ 295 times at low relative humidity, 20 % RH) than that of pure NaCl, deliquesced at lower environmental RH of 62 - 66 % than the hygroscopic point (hg.p., 75 % RH) of NaCl, and formed larger water droplets ~ 6 - 10 times of its original measured size area, whereas the pure NaCl still remained as crystal at the same condition...
November 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/29149288/overexpression-of-seipin1-increases-oil-in-hydroxy-fatty-acid-accumulating-seeds
#5
Daniel Lunn, James G Wallis, John Browse
While plant oils are an important source of food, plants also produce oils containing specialized fatty acids with chemical and physical properties valued in industry. Ricinoleic acid, a hydroxy-fatty acid (HFA) produced in the seed of castor (Ricinus communis), is of particular value with a wide range of applications. Since castor cultivation is currently successful only in tropic climates, and because castor seed contain the toxin ricin, there are ongoing efforts to develop a temperate crop capable of HFA biosynthesis...
November 15, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29145633/the-initiation-propagation-and-dynamics-of-crispr-spycas9-r-loop-complex
#6
Yan Zeng, Yang Cui, Yong Zhang, Yanruo Zhang, Meng Liang, Hui Chen, Jie Lan, Guangtao Song, Jizhong Lou
CRISPR-Cas9 system has been widely used for efficient genome editing. Although the structures of Cas9 protein in complex with single-guided RNA (sgRNA) and target DNA have been resolved, the molecular details about the formation of Cas9 endonuclease R-loop structure remain elusive. Here we examine the DNA cleavage activities of Streptococcus pyogenes Cas9 (SpyCas9) and its mutants using various target sequences and study the conformational dynamics of R-loop structure during target binding using single-molecule fluorescence energy transfer (smFRET) technique...
November 14, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29144733/a-mechanism-for-symmetry-breaking-and-shape-control-in-single-crystal-gold-nanorods
#7
Michael J Walsh, Wenming Tong, Hadas Katz-Boon, Paul Mulvaney, Joanne Etheridge, Alison M Funston
The phenomenon of symmetry breaking-in which the order of symmetry of a system is reduced despite manifest higher-order symmetry in the underlying fundamental laws-is pervasive throughout science and nature, playing a critical role in fields ranging from particle physics and quantum theory to cosmology and general relativity. For the growth of crystals, symmetry breaking is the crucial step required to generate a macroscopic shape that has fewer symmetry elements than the unit cell and/or seed crystal from which it grew...
November 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29144196/quantitative-weight-of-evidence-assessment-of-higher-tier-studies-on-the-toxicity-and-risks-of-neonicotinoids-in-honeybees-3-clothianidin
#8
Keith R Solomon, Gladys L Stephenson
A quantitative weight of evidence (QWoE) methodology was used to assess higher tier studies on the effects of clothianidin (CTD) on honeybees. Assessment endpoints were population size and viability of commercially managed bees and quantity of hive products. A colony-level no-observed-adverse effect concentration (NOAEC) of 25 µg CTD/kg syrup, equivalent to an oral no-observed-adverse effect-dose (NOAED) of 7.3 ng/bee/d for all responses measured. Based on a NOAEC of 19.7 µg/kg pollen, the NOAED for honeybee larvae was 2...
November 16, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29141407/partial-solar-radiation-exclusion-with-color-shade-nets-reduce-the-degradation-of-organic-acids-and-flavonoids-of-grape-berry-vitis-vinifera-l
#9
Johan Martínez-Lüscher, Christopher Cody Lee Chen, Luca Brillante, Sahap Kaan Kurtural
The incidence of solar radiation on red-skinned grapes can promote the synthesis of flavonoid desirable for wine production, elevated temperature may impair their accumulation. We performed a shade cloth trial covering the fruit zone (from pepper-corn size to maturity) with four polyethylene 1-meter curtains with different optical properties (20% shading factor Pearl colored and 40% shading factor Aluminet, Blue and Black colored) and a Control with no cover. Cluster temperature was 3.7°C lower on the Southwest side in Black-40% clusters during the warmest part of the day compared to Control...
November 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29140987/dating-the-beginning-of-the-roman-viticultural-model-in-the-western-mediterranean-the-case-study-of-chianti-central-italy
#10
Riccardo Aversano, Boris Basile, Mauro Paolo Buonincontri, Francesca Carucci, Domenico Carputo, Luigi Frusciante, Gaetano Di Pasquale
Although domestication of the grapevine (Vitis vinifera L.) has been extensively documented, the history of genotype selection and evolution of vineyard management remain relatively neglected fields of study. The find of 454 waterlogged grapevine pips from a well-dated Etrusco-Roman site in the Chianti district (Tuscany, Central Italy) is an extraordinary chance to gain insights into the progress of viticulture occurring in a key historical period in one of the world's most famous wine regions. The molecular and geometrical analyses of grape seeds showed (a) the presence in the site of different grapevine individuals and (b) a sudden increase in pip size, occurring at around 200 BC, whic explainable by the selection and introduction of new varieties...
2017: PloS One
https://www.readbyqxmd.com/read/29140765/quantitative-weight-of-evidence-assessment-of-higher-tier-studies-on-the-toxicity-and-risks-of-neonicotinoids-in-honeybees-2-imidacloprid
#11
Gladys L Stephenson, Keith R Solomon
A quantitative weight of evidence (QWoE) methodology was used to assess higher-tier studies on the effects of imidacloprid (IMI) on honeybees. Assessment endpoints were population size and viability of commercially managed bees and quantity of hive products. A colony-level no-observed-adverse effect concentration (NOAEC) of 25 µg IMI/kg syrup, equivalent to an oral no-observed-adverse-effect-dose of 7.3 ng/bee/d for all responses, was measured. The overall weight of evidence indicates that there is minimal risk to honeybees from exposure to IMI from its use as a seed treatment...
November 15, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29137914/orthogonal-potency-analysis-of-mesenchymal-stromal-cell-function-during-ex-vivo-expansion
#12
Danika Khong, Matthew Li, Amy Singleton, Ling-Yee Chin, Shilpaa Munkundan, Biju Parekkadan
Adult bone marrow mesenchymal stromal cells (MSCs) have cross-functional, intrinsic potency that is of therapeutic interest. Their ability to regenerate bone, fat, and cartilage, modulate the immune system, and nurture the growth and function of other bone marrow hematopoietic stem/progenitor cells have all been evaluated by transplant applications of MSCs. These applications require the isolation and expansion scaled cell production. To investigate biophysical properties of MSCs that can be feasibly utilized as predictors of bioactivity during biomanufacturing, we used a low-density seeding model to drive MSCs into proliferative stress and exhibit the hallmark characteristics of in vitro aging...
November 11, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/29137633/bi-directional-exosome-driven-intercommunication-between-the-hepatic-niche-and-cancer-cells
#13
Nikolina Dioufa, Amanda M Clark, Bo Ma, Colin H Beckwitt, Alan Wells
BACKGROUND: Our understanding of the multiple roles exosomes play during tumor progression is still very poor and the contribution of the normal tissue derived exosomes in distant seeding and tumor outgrowth has also not been widely appreciated. METHODS: Using our all-human liver microphysiological system (MPS) platform as a model to closely recapitulate the early metastatic events, we isolated exosomes from both tumor cells and liver microenvironment. RESULTS: We observed that while priming of the hepatic niche (HepN) with MDA-231 breast cancer derived exosomes facilitated seeding of the cancer cells in the liver, subsequent tumor outgrowth was diminished; this was consistent with increased entry into dormancy...
November 14, 2017: Molecular Cancer
https://www.readbyqxmd.com/read/29137616/foraging-dispersion-of-ryukyu-flying-foxes-and-relationships-with-fig-abundance-in-east-asian-subtropical-island-forests
#14
Ya-Fu Lee, Yen-Min Kuo, Hsin-Yi Chang, Chi-Feng Tsai, Shigeyuki Baba
BACKGROUND: Figs are widely distributed key resources to many tropical-subtropical animals, and flying-foxes are major consumers and seed dispersers of figs. Bat-fig interrelationships, however, may vary among species differing in fruiting traits, i.e., bat- versus bird-dispersed figs. We examined Ryukyu flying-fox foraging dispersion and the relationships with tree species composition and fig abundance in forests of Iriomote Island. RESULTS: Bat foraging dispersion showed no spatial patterns with respect to different areas of the island, and was not explained by heterogeneity, density, or basal area (BA) of total trees, nor by relative density or BA of fruiting trees or total fruiting figs among sites...
November 14, 2017: BMC Ecology
https://www.readbyqxmd.com/read/29136411/shoot-apical-meristem-and-plant-body-organization-a-cross-species-comparative-study
#15
Renáta Schnablová, Tomáš Herben, Jitka Klimešová
Background and Aims: The shoot apical meristem (SAM) is the key organizing element in the plant body and is responsible for the core of plant body organization and shape. Surprisingly, there are almost no comparative data that would show links between parameters of the SAM and whole-plant traits as drivers of the plant's response to the environment. Methods: Interspecific differences in SAM anatomy were examined in 104 perennial herbaceous angiosperms. Key Results: There were differences in SAM parameters among individual species, their phylogenetic patterns, and how their variation is linked to variation in plant above-ground organs and hence species' environmental niches...
November 10, 2017: Annals of Botany
https://www.readbyqxmd.com/read/29136171/mating-system-and-effective-population-size-of-the-overexploited-neotropical-tree-myroxylon-peruiferum-l-f-and-their-impact-on-seedling-production
#16
Ellida de Aguiar Silvestre, Kaiser Dias Schwarcz, Carolina Grando, Jaqueline Bueno de Campos, Patricia Sanae Sujii, Evandro Vagner Tambarussi, Camila Menezes Trindade Macrini, José Baldin Pinheiro, Pedro Henrique Santin Brancalion, Maria Imaculada Zucchi
The reproductive system of a tree species has substantial impact on genetic diversity and structure within and among natural populations. Such information, should be considered when planning tree planting for forest restoration. Here, we describe the mating system and genetic diversity of an overexploited Neotropical tree, Myroxylon peruiferum L.f. (Fabaceae) sampled from a forest remnant (10 seed trees and 200 seeds) and assess whether the effective population size of nursery-grown seedlings (148 seedlings) is sufficient to prevent inbreeding depression in reintroduced populations...
November 10, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29135463/new-method-for-mbe-growth-of-gaas-nanowires-on-silicon-using-colloidal-au-nanoparticles
#17
Alexei Bouravleuv, Igor Ilkiv, Rodion Reznik, Konstantin Kotlyar, Ilya Soshnikov, George Cirlin, Pavel Brunkov, Demid Kirilenko, Leonid V Bondarenko, Aleksandr Nepomnyaschiy, Dimitry V Gruznev, Andrey V Zotov, Alexander Saranin, Veer Dhaka, Harri Lipsanen
We present a new method for the deposition of colloidal Au nanoparticles on the surface of silicon substrates based on short-time Ar plasma treatment without the use of any polymeric layers. The elaborated method is compatible with molecular beam epitaxy, which allowed us to carry out the detailed study of GaAs nanowire synthesis on Si(111) substrates using colloidal Au nanoparticles as seeds for their growth. The results obtained elucidated the causes of the difference between the initial nanoparticle sizes and the diameters of the grown nanowires...
November 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29134790/soybean-mosaic-virus-a-successful-potyvirus-with-a-wide-distribution-but-restricted-natural-host-range
#18
M R Hajimorad, L L Domier, S A Tolin, S A Whitham, M A Saghai Maroof
Taxonomy. Soybean mosaic virus (SMV) is a species within the genus Potyvirus, family Potyviridae that includes almost a quarter of all known plant RNA viruses affecting agriculturally important plants. The Potyvirus genus is the largest of all genera of plant RNA viruses with 160 species. Particle. The filamentous particles of SMV, typical of potyviruses, are about 7,500 Å long and 120 Å in diameter with a central hole of about 15 Å in diameter. Coat protein residues are arranged in helice of about 34 Å pitch having slightly less than 9 subunits per turn...
November 14, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/29134380/radioactive-seed-localization-versus-wire-localization-for-nonpalpable-breast-lesions-a-two-year-initial-experience-at-a-large-community-hospital
#19
Lacey Stelle, Taylor Schoenheit, Allison Brubaker, Xiwei Tang, Peiyong Qu, Kimberly Cradock, Anna Higham
BACKGROUND: Radioactive seed localization (RSL) is a safe and effective alternative to wire localization (WL) for nonpalpable breast lesions. While several large academic institutions currently utilize RSL, few community hospitals have adopted this technique. OBJECTIVE: The aim of this study was to examine the experience of RSL versus WL at a large community hospital. METHODS: A retrospective chart review of patients who underwent RSL or WL for breast-conserving surgery from 1 November 2013 to 31 November 2015...
November 13, 2017: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/29133831/protein-ligand-blind-docking-using-quickvina-w-with-inter-process-spatio-temporal-integration
#20
Nafisa M Hassan, Amr A Alhossary, Yuguang Mu, Chee-Keong Kwoh
"Virtual Screening" is a common step of in silico drug design, where researchers screen a large library of small molecules (ligands) for interesting hits, in a process known as "Docking". However, docking is a computationally intensive and time-consuming process, usually restricted to small size binding sites (pockets) and small number of interacting residues. When the target site is not known (blind docking), researchers split the docking box into multiple boxes, or repeat the search several times using different seeds, and then merge the results manually...
November 13, 2017: Scientific Reports
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