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https://www.readbyqxmd.com/read/28102581/molecular-mechanisms-and-ecological-function-of-far-red-light-signalling
#1
REVIEW
David J Sheerin, Andreas Hiltbrunner
Land plants possess the ability to sense and respond to far-red light (700-760 nm), which serves as an important environmental cue. Due to the nature of far-red light, it is not absorbed by chlorophyll and thus is enriched in canopy shade, and will also penetrate deeper into soil than other visible wavelengths. Far-red light responses include regulation of seed germination, suppression of hypocotyl growth, induction of flowering, and accumulation of anthocyanins, which depend on one member of the phytochrome photoreceptor family, phytochrome A (phyA)...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102548/the-shade-avoidance-syndrome-multiple-signals-and-ecological-consequences
#2
REVIEW
Carlos L Ballaré, Ronald Pierik
Plants use photoreceptor proteins to detect the proximity of other plants and to activate adaptive responses. Of these photoreceptors, phytochrome B (phyB), which is sensitive to changes in the red (R) to far-red (FR) ratio of sunlight, is the one that has been studied in greatest detail. The molecular connections between the proximity signal (low R:FR) and a model physiological response (increased elongation growth) have now been mapped in considerable detail in Arabidopsis seedlings. We briefly review our current understanding of these connections, and discuss recent progress in establishing the roles of other photoreceptors in regulating growth-related pathways in response to competition cues...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28101201/diosmetin-inhibits-cell-proliferation-and-induces-apoptosis-by-regulating-autophagy-via-the-mammalian-target-of-rapamycin-pathway-in-hepatocellular-carcinoma-hepg2-cells
#3
Jie Liu, Hao Ren, Bin Liu, Qingyu Zhang, Mingyi Li, Runzhi Zhu
Hepatocellular carcinoma (HCC), which is a type of malignant tumor, is the fifth most common cancer in men and ninth in women worldwide. The aim of the present study was to investigate the antitumor effect of diosmetin (DIOS) in hepatocellular carcinoma HepG2 cells. The proliferation, apoptosis and autophagy rates of HepG2 cells were measured following treatment with DIOS. The effects of DIOS treatment on HepG2 cell proliferation and apoptosis rates were analyzed using MTT assays and Annexin V staining, respectively...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28100711/effects-of-structural-complexity-on-within-canopy-light-environments-and-leaf-traits-in-a-northern-mixed-deciduous-forest
#4
Alexander T Fotis, Peter S Curtis
Canopy structure influences forest productivity through its effects on the distribution of radiation and the light-induced changes in leaf physiological traits. Due to the difficulty of accessing and measuring forest canopies, few field-based studies have quantitatively linked these divergent scales of canopy functioning. The objective of our study was to investigate how canopy structure affects light profiles within a forest canopy and whether leaves of mature trees adjust morphologically and biochemically to the light environments characteristic of canopies with different structural complexity...
January 18, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28099981/use-of-esophageal-hemoximetry-to-assess-the-effect-of-packed-red-blood-cell-transfusion-on-gastrointestinal-oxygenation-in-newborn-infants
#5
Farha M Vora, Judy Gates, Kimberley Gerard, Shawn Hanson, Richard L Applegate, Arlin B Blood
Objectives There are no widely accepted methods of continuously monitoring gut oxygenation in the newborn during packed red blood cell transfusion. We investigated the use of an orally inserted light spectroscopy probe to measure lower esophageal oxyhemoglobin saturations (eStO2) before, during, and after transfusion and made comparisons with abdominal near-infrared spectroscopy (NIRS) and superior mesenteric artery (SMA) flow. Study Design Thirteen neonates with corrected gestational ages ranging from 22 weeks, 0 day to 37 weeks, 5 days were enrolled...
January 18, 2017: American Journal of Perinatology
https://www.readbyqxmd.com/read/28098971/photodiode-response-in-a-ch3nh3pbi3-ch3nh3sni3-heterojunction
#6
Massimo Spina, Laszlo Mihaly, Karoly Holczer, Bálint Náfrádi, Andrea Pisoni, László Forró, Endre Horváth
Here we report another surprising feature of this material family, the photo-tunability of the diode response of a heterojunction made of CH3NH3PbI3 and its close relative, CH3NH3SnI3. In the dark state the device behaves as a diode, with the Sn homologue acting as the "p" side. The junction is extremely sensitive to illumination. A complete reversal of the diode polarity, the first observation of its kind, is seen when the junction is exposed to red laser light of 25 mW/cm(2) or larger power density. This finding opens up the possibility for a novel class of opto-electronic devices...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098969/exciplex-forming-co-host-based-red-phosphorescent-organic-light-emitting-diodes-with-long-operational-stability-and-high-efficiency
#7
Jeong-Hwan Lee, Hyun Shin, Jae-Min Kim, Kwon-Hyeon Kim, Jang-Joo Kim
The use of exciplex forming co-hosts and phosphors incredibly boosts the efficiency of organic light-emitting diodes (OLEDs) by providing a barrier-free charge injection into an emitting layer and a broad recombination zone. However, most of the efficient OLEDs based on the exciplex forming co-hosts has suffered from the short operational lifetime. Here, we demonstrated phosphorescent OLEDs (PhOLEDs) having both high efficiency and long lifetime by using a new exciplex forming co-host composed of N,N'-diphenyl-N,N'-bis(1,1'-biphenyl)-4,4'-diamine (NPB) and (1,3,5-triazine-2,4,6-triyl)tris(benzene-3,1-diyl))tris(diphenylphosphine oxide) (PO-T2T)...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098339/the-effect-of-blue-light-on-stomatal-oscillations-and-leaf-turgor-pressure-in-banana-leaves
#8
Yotam Zait, Or Shapira, Amnon Schwartz
Stomatal oscillations are cyclic opening and closing of stomata, presumed to initiate from hydraulic mismatch between leaf water supply and transpiration rate. To test this assumption, mismatches between water supply and transpiration were induced using manipulations of VPD (vapor pressure deficit) and light spectrum in banana (Musa acuminata). Simultaneous measurements of gas exchange with changes in leaf turgor pressure were used to describe the hydraulic mismatches. An increase of VPD above a certain threshold, caused stomatal oscillations with variable amplitudes...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28097620/seminal-tract-amyloidosis-synchronous-amyloidosis-of-the-seminal-vesicles-deferent-ducts-and-ejaculatory-ducts
#9
Lea Rath-Wolfson, Golan Bubis, Shmuel Shtrasburg, Asaf Shvero, Rumelia Koren
Senile Seminal Vesicle Amyloidosis (SSVA) increases with age. Involvement of the whole seminal tract, i.e. the seminal vesicles, ejaculatory and deferent ducts was first reported by us in the International Symposium on Amyloidosis 1998. Since then we encountered four more cases of SSVA. In all these cases the ejaculatory and deferent ducts were also involved by amyloid. The amyloid was located mostly sub-epithelially, stained positively with Congo red, gave green birefringence under polarized light and was permanganate sensitive, slightly positive for lactoferrin immunostaining and negative for all known amyloid types...
January 17, 2017: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/28095557/the-photodynamic-therapy-experience-of-a-high-volume-laser-and-dermatologic-surgery-center
#10
David E Orbuch, Lauren Penn, Bradley S Bloom, Jeremy A Brauer, Daniel B Shin, Joshua Greenbaum, Leonard J Bernstein, Elliot T Weiss, Robert T Anolik, Roy G Geronemus
BACKGROUND: Photodynamic therapy (PDT) is an FDA approved treatment for actinic keratoses (AK's) although multiple off-label indi- cations are reported. Despite frequent use for AK's, no clear consensus exists regarding protocols for overall treatment parameters. METHODS: Retrospective chart review of 1,491 subjects who underwent PDT between 2007 and 2011 at a high volume laser surgery center. Demographic information, clinical history, treatment data, and subsequent diagnosis of skin cancers were recorded...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28095551/acne-treatment-with-3-step-broadband-light-protocol
#11
Patrick Bitter
BACKGROUND AND OBJECTIVE: A new 3-step protocol using broadband light allows patients with moderate to severe in ammatory acne to avoid potential side effects of systemic acne treatments and the risks and uncertainties associated with laser and light treatments to date. The protocol also addresses acne scarring and, with appropriate modi cations, all skin types. METHODS: The protocol consists of 6 to 8 treatments performed with a single device that allows the user to select wavelength, spot size, uence, and pulse duration...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28095301/imaging-the-photosystem-i-photosystem-ii-chlorophyll-ratio-inside-the-leaf
#12
Emilie Wientjes, John Philippi, Jan Willem Borst, Herbert van Amerongen
Oxygenic photosynthesis is driven by photosystems I (PSI) and II (PSII). In plants the number of chlorophylls of PSI versus PSII is adjusted to the light irradiance spectrum. On a timescale of days, this is regulated at the level of protein concentration. Instead, on a timescale of minutes, it is regulated by the dynamic association of light-harvesting complex II with either PSI or PSII. Thus far very diverse values have been reported for the PSI/PSII chlorophyll ratio, ranging from 0.54 to 1.4. The methods used require the isolation of chloroplasts and are time consuming...
January 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28094989/-bitter-sweet-polymeric-micelles-formed-by-block-copolymers-from-glucosamine-and-cholic-acid
#13
Kun Zhang, Yongguang Jia, I-Huang Tsai, Satu Strandman, Li Ren, Liangzhi Hong, Guangzhao Zhang, Ying Guan, Yongjun Zhang, Julian X X Zhu
Natural compounds glucosamine and cholic acid have been used to make acrylic monomers which are subsequently used to prepare amphiphilic block copolymers by reversible addition-fragmentation chain transfer (RAFT) polymerization. Despite the striking difference in polarity and solubility, three diblock copolymers consisting of glucosamine and cholic acid pendants with different hydrophilic and hydrophobic chain lengths have been synthesized without the use of protecting groups. They are shown to self-assemble into polymeric micelles with a "bitter" bile acid core and "sweet" sugar shell in aqueous solutions as evidenced by dynamic light scattering and transmission electron microscopy...
January 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28094932/series-d-f-heteronuclear-metal-organic-frameworks-color-tunability-and-luminescent-probe-with-switchable-properties
#14
Xun Feng, Yuquan Feng, Nan Guo, Yiling Sun, Tian Zhang, Lufang Ma, Liya Wang
A series of five unique d-f heteronuclear luminescent metal-organic frameworks (MOFs) in an entangled polyrotaxane array and the light-harvesting block homonuclear zinc compound have been isolated successfully and characterized. The series of isostructural polymers feature 3,4-connected (4.8(2))(4.8(3).9(2))(6.8.9)2(6.9(2))(8(3)) topology and high stability, exhibiting diverse void spaces. By taking advantage of the isostructural MOFs 2 and 3, the intensities of red and green emissions can be modulated by adjusting the ratios of Eu(III) and Tb(III) ions correspondingly, and white-light emission can be generated by a combination of different doped Tb(III) and Eu(III) concentrations...
January 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28094925/retinal-based-proton-pumping-in-the-near-infra-red
#15
Srividya Ganapathy, Hanka Venselaar, Que Chen, Huub J M de Groot, Klaas J Hellingwerf, Willem J de Grip
Proteorhodopsin (PR) and Gloeobacter rhodopsin (GR) are retinal-based light-driven proton pumps which absorb visible light (maxima 520-540 nm). Shifting the action spectra of these proton pumps beyond 700 nm would generate new prospects in optogenetics, membrane sensor technology, and complementation of oxygenic phototrophy. We thereby investigated the effect of red-shifting analogs of retinal, combined with red-shifting mutations, on the spectral properties and pump activity of the resulting pigments. We investigated a variety of analogs, including many novel ones...
January 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28094404/excitation-wavelength-independent-visible-color-emission-of-carbon-dots
#16
Hua Wang, Chun Sun, Xingru Chen, Yu Zhang, Vicki L Colvin, Quinton Rice, Jaetae Seo, Shengyu Feng, Shengnian Wang, William W Yu
Carbon dots (CDs) usually emit a strong blue light and excitation wavelength dependent long wavelength lights. This significantly limits their applications because one has to use a series of different excitation light sources to get different colors and the long wavelength emissions are usually very weak. We found that one type of CDs synthesized from p-phenylenediamine could emit various long wavelength lights (green to red) independent of the excitation wavelength when dispersed in different solvents. The photoluminescence quantum yields of the same CDs were 10-35% in different solvents for different color emissions...
January 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28094296/hydrophobic-residues-near-the-bilin-chromophore-binding-pocket-modulate-spectral-tuning-of-insert-cys-subfamily-cyanobacteriochromes
#17
Sung Mi Cho, Sae Chae Jeoung, Ji-Young Song, Ji-Joon Song, Youn-Il Park
Cyanobacteriochromes (CBCRs) are a subfamily of phytochrome photoreceptors found exclusively in photosynthetic cyanobacteria. Four CBCRs containing a second Cys in the insert region (insert-Cys) have been identified from the nonheterocystous cyanobacterium Microcoleus B353 (Mbr3854g4 and Mbl3738g2) and the nitrogen fixing, heterocystous cyanobacterium Nostoc punctiforme (NpF2164g3 and NpR1597g2). These insert-Cys CBCRs can sense light in the near-UV to orange range, but key residues responsible for tuning their colour sensitivity have not been reported...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093848/one-mutation-two-distinct-disease-variants-unravelling-the-impact-of-transthyretin-amyloid-fibril-composition
#18
REVIEW
O B Suhr, E Lundgren, P Westermark
Although hereditary transthyretin (h-ATTR) amyloidosis is a monogenetic disease, a large variation in its phenotype has been observed. The common hypothesis of amyloid fibril formation involves dissociation of the transthyretin (TTR) tetramer into monomers that after misfolding reassemble into amyloid fibrils. This notion is partly challenged by the finding of two distinct types of amyloid fibrils. One of these, type A, consists of C-terminal ATTR fragments and full-length TTR, whereas the other, type B, consists only of full-length TTR...
January 17, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28088116/upconversion-color-tuning-in-ce-3-doped-liyf4-yb-3-ho-3-liyf4-nanoparticles-towards-ratiometric-fluorescence-detection-of-chromium-iii
#19
Shijiang Liu, Yangjie Li, Cheng Zhang, Liang Yang, Tingting Zhao, Ruilong Zhang, Changlong Jiang
Ratiometric fluorescence sensor exhibits advantages of sensitive response, high anti-interference ability and naked eye visualization owing to multiple independent emission peaks utilized for results analysis. To achieve such multi-emission probe, the traditional methods have involved simple mixing of two emitters or tedious synthesis processes of hybrid material. However, these probes often have problems of inconstant emission strength ratio, low light-stability, and complicated synthetic process, which limit their applications in practical field...
January 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088105/tectona-grandis-leaf-extract-free-and-associated-with-nanoemulsions-as-a-possible-photosensitizer-of-mouse-melanoma-b16-cell
#20
Cydia de Menezes Furtado, Fernando Sergio Escocio Drumond Viana de Faria, Ricardo Bentes Azevedo, Karen Py-Daniel, Ana Lygia Dos Santos Camara, Jaqueline Rodriguez da Silva, Everton de Holanda Oliveira, Anselmo Fortunato Ruiz Rodriguez, Igor Anatolievich Degterev
Over the past six years we have been studying extracts from tropical, specially Amazon, plants, to search for new sensitizers for photodynamic therapy of cancer and infectious diseases. Tectona grandis is a genus of tropical hardwood trees in the mint family, Lamiaceae. That is native to south and southeast Asia, but since the end of the 20th century is also gaining ground in the Amazon. The present work aims to evaluate the photodynamic potential of hydro-alcoholic extract from Tectona grandis LF leaves (TGE) and the same extract prepared as the oil-water nanoemulsion (TGE-NE) against melanoma B16 F10 cells...
January 5, 2017: Journal of Photochemistry and Photobiology. B, Biology
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