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https://www.readbyqxmd.com/read/28944653/flower-like-molybdenum-disulfide-for-polarity-triggered-accumulation-release-of-small-molecules
#1
Qi Zhang Huang, Yueyun Fang, Jifu Shi, Yan Liang Liang, Yan Qing Zhu, Gang Xu
Flower-like molybdenum disulfide (MoS2) with rich edge sites has been prepared by hydrothermal method. The edge sites possess polarity due to the non-centrosymmetric Mo-S on exposed (100) facets and thus show a strong electrostatic attraction towards polar species. The flower-like MoS2 can be used as small-molecule carriers for the model drug, Rhodamine B (RhB). The results prove that flower-like MoS2 have fast adsorption kinetics and perform a switchable accumulation/release with response to the solvent polarity...
September 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28944559/harnessing-photochemical-shrinkage-in-direct-laser-writing-for-shape-morphing-of-polymer-sheets
#2
Anton A Bauhofer, Sebastian Krödel, Jan Rys, Osama R Bilal, Andrei Constantinescu, Chiara Daraio
Structures that change their shape in response to external stimuli unfold possibilities for more efficient and versatile production of 3D objects. Direct laser writing (DLW) is a technique based on two-photon polymerization that allows the fabrication of microstructures with complex 3D geometries. Here, it is shown that polymerization shrinkage in DLW can be utilized to create structures with locally controllable residual stresses that enable programmable, self-bending behavior. To demonstrate this concept, planar and 3D-structured sheets are preprogrammed to evolve into bio-inspired shapes (lotus flowers and shark skins)...
September 25, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28944415/nectar-and-oleiferous-trichomes-as-floral-attractants-in-bulbophyllum-saltatorium-lindl-orchidaceae
#3
Małgorzata Stpiczyńska, Bartosz J Płachno, Kevin L Davies
Although many Orchidaceae have deceit flowers that produce no reward, the most common reward, when present, is nectar. Bulbophyllum, however, is unusual in that the labellar secretions of most species investigated to date lack sugars, and, therefore, cannot be considered true nectar. The African species Bulbophyllum saltatorium is an exception in that it produces not only nectar but also possesses specialized, capitate oleiferous trichomes. The nectary of B. saltatorium is borne on the labellum and is represented by a deep, narrow, median longitudinal groove, having a small aperture, and flanked by trichomes...
September 24, 2017: Protoplasma
https://www.readbyqxmd.com/read/28944029/predicting-the-establishment-success-of-introduced-target-species-in-grassland-restoration-by-functional-traits
#4
Karina Engst, Annett Baasch, Helge Bruelheide
Species-rich semi-natural grasslands are highly endangered habitats in Central Europe and numerous restoration efforts have been made to compensate for the losses in the last decades. However, some plant species could become more easily established than others. The establishment success of 37 species was analyzed over 6 years at two study sites of a restoration project in Germany where hay transfer and sowing of threshing material in combination with additional sowing were applied. The effects of the restoration method applied, time since the restoration took place, traits related to germination, dispersal, and reproduction, and combinations of these traits on the establishment were analyzed...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28943902/khat-promotes-human-breast-cancer-mda-mb-231-cell-apoptosis-via-mitochondria-and-mapk-associated-pathways
#5
Yu Lu, Yanyan Li, Min Xiang, Jie Zhou, Juan Chen
Khat (Catha edulis Forsk) is a flowering evergreen plant in Eastern Africa and Southwestern Arabia. Consumption of Khat has been associated with the development of oral cancer, but its mechanism of action on the molecular level remains unclear. The present study demonstrated the cytotoxic effect of khat extracts on the human breast cancer cell line MDA-MB-231. Trypan blue exclusion assays, flow cytometry, fluorescent and electron microscopy, as well as western blotting were used to analyze the effects of Khat on the cell viability of breast cancer cells, expression of apoptotic-associated proteins and the levels of reactive oxygen species (ROS)...
October 2017: Oncology Letters
https://www.readbyqxmd.com/read/28943862/the-chemical-and-antibacterial-evaluation-of-st-john-s-wort-oil-macerates-used-in-kosovar-traditional-medicine
#6
James T Lyles, Austin Kim, Kate Nelson, Angelle L Bullard-Roberts, Avni Hajdari, Behxhet Mustafa, Cassandra L Quave
Hypericum perforatum L. (Hypericaceae), or St. John's Wort, is a well-known medicinal herb often associated with the treatment of anxiety and depression. Additionally, an oil macerate (Oleum Hyperici) of its flowering aerial parts is widely used in traditional medicine across the Balkans as a topical wound and ulcer salve. Other studies have shown that Oleum Hyperici reduces both wound size and healing time. Of its active constituents, the naphthodianthrone hypericin and phloroglucinol hyperforin are effective antibacterial compounds against various Gram-positive bacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28942180/de-novo-transcriptome-analysis-in-dendrobium-and-identification-of-critical-genes-associated-with-flowering
#7
Yue Chen, Qi Shen, Renan Lin, Zhuangliu Zhao, Chenjia Shen, Chongbo Sun
Artificial control of flowering time is pivotal for the ornamental value of orchids including the genus Dendrobium. Although various flowering pathways have been revealed in model plants, little information is available on the genetic regualtion of flowering in Dendrobium. To identify the critical genes associated with flowering, transcriptomes from four organs (leaf, root, stem and flower) of D. officinale were analyzed in our study. In total, 2645 flower-specific transcripts were identified. Functional annotation and classification suggested that several metabolic pathways, including four sugar-related pathways and two fatty acid-related pathways, were enriched...
September 14, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28941677/phenolic-profiling-and-antioxidant-capacity-of-calligonum-azel-maire-a-tunisian-desert-plant
#8
Marwa Bannour, Boutheina Fellah, Gabriele Rocchetti, Samira Ashi-Smiti, Dirk W Lachenmeier, Luigi Lucini, Ayda Khadhri
The comprehensive phenolic fingerprint of Calligonum azel Maire plant fractions, collected from the Tunisian Desert, have been assessed for the first time as a source of natural antioxidants. Total phenolic content (TPC), Trolox Equivalent Antioxidant Capacity (TEAC) in scavenging DPPH, ABTS(+) and Ferric Reducing Antioxidant Power (FRAP) were determined. C. azel Maire showed a relevant content in phenolic compounds, which are related to the antioxidant activity. The flowers presented the highest antioxidant capacity against DPPH free radicals, while the leaves showed the highest scavenging capacity against ABTS...
November 2017: Food Research International
https://www.readbyqxmd.com/read/28939874/efficient-3d-silver-flower-like-microstructures-for-non-enzymatic-hydrogen-peroxide-h2o2-%C3%A2-amperometric%C3%A2-detection
#9
Gumaa A El-Nagar, Radwan M Sarhan, Ahed Abouserie, Natalia Maticiuc, Matias Bargheer, Iver Lauermann, Christina Roth
We present an efficient non-enzymatic hydrogen peroxide sensor composed of flower-like silver microstructures. The silver microstructures´ morphology is controlled by adding minute amounts of either succinic or malonic acid as directing agents. Morphologically, silver particles showed ball-like structures in the absence of both directing agents, while the presence of 50 ppm of succinic acid and malonic acid lead to monodisperse chrysanthemum and water-lily flower-like structure, respectively. A higher concentration of succinic acid resulted in a rose flower-like structures...
September 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28937649/synthesis-and-enhanced-ethanol-gas-sensing-properties-of-the-g-c%C3%A2-n%C3%A2-nanosheets-decorated-tin-oxide-flower-like-nanorods-composite
#10
Yan Wang, Jianliang Cao, Cong Qin, Bo Zhang, Guang Sun, Zhanying Zhang
Flower-like SnO₂/g-C₃N₄ nanocomposites were synthesized via a facile hydrothermal method by using SnCl₄·5H₂O and urea as the precursor. The structure and morphology of the as-synthesized samples were characterized by using the X-ray powder diffraction (XRD), electron microscopy (FESEM and TEM), and Fourier transform infrared spectrometer (FT-IR) techniques. SnO₂ displays the unique 3D flower-like microstructure assembled with many uniform nanorods with the lengths and diameters of about 400-600 nm and 50-100 nm, respectively...
September 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28936706/biodiversity-and-ecology-of-flower-associated-actinomycetes-in-different-flowering-stages-of-protea-repens
#11
Zander R Human, Casparus J Crous, Francois Roets, Stephanus N Venter, Michael J Wingfield, Z Wilhelm de Beer
Actinomycete bacteria have previously been reported from reproductive structures (infructescences) of Protea (sugarbush/suikerbos) species, a niche dominated by fungi in the genera Knoxdaviesia and Sporothrix. It is probable that these taxa have symbiotic interactions, but a lack of knowledge regarding their diversity and general ecology precludes their study. We determined the diversity of actinomycetes within Protea repens inflorescence buds, open inflorescences, young and mature infructescences, and leaf litter surrounding these trees...
September 21, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28936650/analysis-of-fluorescent-reporter-activity-in-the-male-germline-during-pollen-development-by-confocal-microscopy
#12
David Twell, Lynette Brownfield
The male germline of flowering plants develops within the vegetative cell of the male gametophyte (pollen). The germline is established by asymmetric division of the microspore to form the generative cell. Mitotic division of the generative cell then produces the two sperm cells required for double fertilization. These differentiate to produce the proteins required for gamete attachment and fusion. An important aspect of understanding germline development is the characterization of germline gene expression...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28935204/the-taishan-robinia-pseudoacacia-polysaccharides-enhance-immune-effects-of-rabbit-haemorrhagic-disease-virus-inactivated-vaccines
#13
Shifa Yang, Guiming Li, Zengcheng Zhao, Minyan Feng, Jian Fu, Zhongli Huang, Minxun Song, Shuqian Lin
Robinia pseudoacacia flower, a common component in traditional Chinese medicine, has long been well-known for its high pharmaceutical value. This study aimed to assess the immunopotentiating effects of Taishan Robinia Pseudoacacia polysaccharides (TRPPS) in rabbits inoculated with a rabbit haemorrhagic disease virus (RHDV) inactivated vaccine. The rabbits were administered with the RHDV vaccine in conjunction with varying concentrations of TRPPS, and their blood samples were collected at different time points to analyze the ratio and number of blood lymphocytes...
September 18, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28934240/microbial-characterization-of-bee-pollen-from-the-vesuvius-area-collected-by-using-three-different-traps
#14
Gianluigi Mauriello, Annachiara De Prisco, Gennaro Di Prisco, Antonietta La Storia, Emilio Caprio
Flower pollen is collected by honeybee foragers, adhered on their rear legs and transported into the hives in the form of pellets. Once in the hives, bee pollen is moisturised with nectar and bee mouth secretions and due to enzymatically modifications it becomes the so-called bee-bread, the protein reservoir of young bees. Bee pollen can be artificially removed from bee legs and collected by using specific systems, the bee pollen traps. Bee pollen is commercialized for human consumption as fresh product and after freezing or drying...
2017: PloS One
https://www.readbyqxmd.com/read/28934034/transfiguring-light-and-symphonic-blooming-a-wabi-sabi-story-of-humanbecoming-and-human-caring
#15
Lois S Kelley
Transfiguring Light and Symphonic Blooming is word-art to describe the flowering of the humanbecoming and human caring schools of thought over time. A Wabi Sabi story journey was created to turn the tide in a world where the building of a unique body of knowledge for nursing has fallen into disfavor with nursing itself. Using nature-aligned paintings and a Japanese story-art aesthetic with poetry, the beauty of falling away to unitary essentials and holding the value of "both-and" in unitary consciousness was illuminated...
October 2017: Nursing Science Quarterly
https://www.readbyqxmd.com/read/28931871/filtering-effect-of-temporal-niche-fluctuation-and-amplitude-of-environmental-variations-on-the-trait-related-flowering-patterns-lesson-from-sub-mediterranean-grasslands
#16
Andrea Catorci, Karina Piermarteri, Károly Penksza, Judit Házi, Federico Maria Tardella
Timing of flowering is a critical component of community assembly, but how plant traits respond to heterogeneity of resources has been identified mostly through observations of spatial variations. Thus, we performed a trait-based phenological study in sub-Mediterranean grasslands to assess the importance of temporal variation of resources in the species assemblage processes. We found that early flowering species have traits allowing for slow resource acquisition and storage but rapid growth rate. Instead, mid- and late-flowering species exhibited sets of strategies devoted to minimizing water loss by evapotranspiration or aimed at maximizing the species' competitive ability, thanks to slow growth rate and more efficient resource acquisition, conservation and use...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931375/identification-of-fasciclin-like-arabinogalactan-proteins-in-textile-hemp-cannabis-sativa-l-in-silico-analyses-and-gene-expression-patterns-in-different-tissues
#17
Gea Guerriero, Lauralie Mangeot-Peter, Sylvain Legay, Marc Behr, Stanley Lutts, Khawar Sohail Siddiqui, Jean-Francois Hausman
BACKGROUND: The fasciclin-like arabinogalactan proteins (FLAs) belong to the arabinogalactan protein (AGP) superfamily and are known to play different physiological roles in plants. This class of proteins was shown to participate in plant growth, development, defense against abiotic stresses and, notably, cell wall biosynthesis. Although some studies are available on the characterization of FLA genes from different species, both woody and herbaceous, no detailed information is available on the FLA family of textile hemp (Cannabis sativa L...
September 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28931157/is-nocturnal-foraging-in-a-tropical-bee-an-escape-from-interference-competition
#18
Adam R Smith, Shannon M Kitchen, Ryan M Toney, Christian Ziegler
Temporal niche partitioning may result from interference competition if animals shift their activity patterns to avoid aggressive competitors. If doing so also shifts food sources, it is difficult to distinguish the effects of interference and consumptive competition in selecting for temporal niche shift. Bees compete for pollen and nectar from flowers through both interference and consumptive competition, and some species of bees have evolved nocturnality. Here, we use tropical forest canopy towers to observe bees (the night-flying sweat bees Megalopta genalis and M...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28930998/in-vitro-ovule-cultivation-for-live-cell-imaging-of-zygote-polarization-and-embryo-patterning-in-arabidopsis-thaliana
#19
Daisuke Kurihara, Yusuke Kimata, Tetsuya Higashiyama, Minako Ueda
In most flowering plants, the zygote and embryo are hidden deep in the mother tissue, and thus it has long been a mystery of how they develop dynamically; for example, how the zygote polarizes to establish the body axis and how the embryo specifies various cell fates during organ formation. This manuscript describes an in vitro ovule culture method to perform live-cell imaging of developing zygotes and embryos of Arabidopsis thaliana. The optimized cultivation medium allows zygotes or early embryos to grow into fertile plants...
September 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28929226/transcriptome-profiling-of-fully-open-flowers-in-a-frost-tolerant-almond-genotype-in-response-to-freezing-stress
#20
Batool Hosseinpour, Sadegh Sepahvand, Kazem Kamali Aliabad, MohammadReza Bakhtiarizadeh, Ali Imani, Reza Assareh, Seyed Alireza Salami
Spring frost is a major limiting abiotic stress for the cultivation of almonds [Prunus dulcis (Mill.)] in Mediterranean areas or the Middle East. Spring frost, in particular, damages almond fully open flowers, resulting to significant reduction in yield. Little is known about the genetic factors expressed after frost stress in Prunus spp. as well as in almond fully open flowers. Here, we provide the molecular signature of pistils of fully open flowers from a frost-tolerant almond genotype. The level of frost tolerance in this genotype was determined for all three flowering stages and was confirmed by comparing it to two other cultivars using several physiological analyses...
September 19, 2017: Molecular Genetics and Genomics: MGG
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