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https://www.readbyqxmd.com/read/29692096/-effects-of-light-quality-on-leaf-senescence-and-endogenous-hormones-content-in-grapevine-under-protected-cultivation
#1
Hai Bo Wang, Shuai Wang, Xiao di Wang, Xiang Bin Shi, Bao Liang Wang, Xiao Cui Zheng, Zhi Qiang Wang, Feng Zhi Liu
Two grape varieties 'Italia' and 'Centenial seedless' cultured in protected and delayed cultivation were used as experimental materials to study the effects of red and blue light quality on chlorophyll content, net photosynthetic rate, and endogenous hormone content during leaf senescence. The results showed that the chlorophyll content and net photosynthetic rate of the grapes were significantly enhanced in the red light treatment. Although the content of endogenous GA3 was decreased, an increase in abscisic acid (ABA) content and a decrease of total content of zeaxanthin (ZR) were obviously slowed, which led to the significant increase in value of (GA3 +ZR)/ABA, delaying leaf senescence...
November 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692074/-photosynthetic-physio-ecological-characteristics-in-soybean-leaves-at-different-co-2-concentrations
#2
Zi Piao Ye, Hua Jing Kang, Shi Hua Duan, Yi Juan Wang
The availability of CO2 , a substrate for photosynthesis, affects the photosynthesis process and photosynthate production. Using the Li-6400-40B, we measured the photosynthetic electron transport rate and the photosynthetic light-response curves of soybean (Glycine max) leaves at different CO2 concentrations (300, 400, 500 and 600 μmol·mol-1 ). By fitting these parameters with a mechanistic model characterizing the light response of photosynthesis, we obtained aseries of photosynthetic parameters, eco-physiological parameters, as well as the physical parameters of photosynthetic pigments...
February 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692069/-structure-characteristics-of-soil-and-canopy-and-their-relationships-in-wheat-field-under-different-tillage-and-application-of-organic-fertilizer
#3
Dai Jing Zhang, Yan Yan Zhang, Yan Jie Wang, Qian Qing Chen, Hui Li Yang, Jian Hui Ma, Chun Xi Li
With the aim to optimize the structural characteristics of wheat canopy by improving topsoil structure, we examined the effects of three different tillage treatments, deep tillage (DT), shallow tillage (ST), no-tillage (NT) alone, and with application of organic fertilizer, DTF, STF and NTF, on the soil structure and wheat canopy characteristics for five years. Under the same tillage treatment, application of organic fertilizer decreased soil bulk density, the content of soil aggregates with diameter > 5 mm, the mean mass diameter (MWD), and geometric mean diameter (GMD) values of the soil aggregates with diameter >0...
February 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692068/-effects-of-nitrogen-application-rate-on-light-interception-and-dry-matter-distribution-at-diffe-rent-layers-in-wheat-canopy-under-supplemental-irrigation-based-on-measuring-soil-moisture
#4
Xue Jiao Zheng, Zhen Wen Yu, Yong Li Zhang, Yu Shi
With the large-spike wheat cultivar Shannong 23 as test material,a field experiment was conducted by increasing the relative soil moisture content to 70% and 65% at jointing and anthesis stages. Four nitrogen levels,0 (N0 ), 180 (N1 ), 240 (N2 ) and 300 kg·hm-2 (N3 ), were designed to examine the effects of nitrogen application rates on the interception of photosynthetic active radiation (PAR) and dry matter distribution of wheat at different canopy layers. The results showed that the total stem number of wheat population at anthesis stage, the leaf area index at 10, 20 and 30 days after anthesis, PAR capture ratio at upper and middle layers and total PAR capture ratio in wheat canopy on day 20 after anthesis of treatment N2 were significantly higher than those in the treatments of both N0 and N1 ...
February 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692066/-effects-of-inorganic-carbon-supplies-and-light-on-photosynthetic-functions-of-pyropia-haitanensis
#5
Heng Jiang, Ding Hui Zou, Wen Yong Lou
The increasing stocking density of algal often results in lowered carbon and light levels. In this study, Pyropia haitanensis were cultured under four different conditions, i.e., 390 μL·L-1 (ambient carbon supply) + ambient sunlight, 20 μL·L-1 (decreased carbon supply) + ambient sunlight, 390 μL·L-1 + decreased sunlight (20% of ambient sunlight), 20 μL·L-1 + decreased sunlight. The activity of carbonic anhydrase (CA), photosynthetic rate and quantum efficiency of open photosynthetic system 2 (Fv '/Fm ') of the algae under different temperatures were measured to investigate the effects of decreased carbon supply and lowered light on photosynthetic functions of P...
February 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692028/-effects-of-light-intensity-on-photosynthetic-capacity-and-light-energy-allocation-in-panax-notoginseng
#6
Xiang Zeng Xu, Jin Yan Zhang, Guang Hui Zhang, Guang Qiang Long, Sheng Chao Yang, Zhong Jian Chen, Fu Gang Wei, Jun Wen Chen
To explore the effects of light intensity on photosynthetic characteristics and light adaptation of the shade-demanding species Panax notoginseng, the responses of photosynthesis to photosynthetic photon flux density, CO2 and sunflecks in the two-year-old Panax notoginseng were investigated under different levels of light intensity (29.8%, 9.6%, 5.0%, 1.4% and 0.2% of full sunlight). Meanwhile, chlorophyll a fluorescence parameter and light energy partitioning were also recorded and calculated in the responsive process...
January 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692020/-impact-of-low-temperature-in-young-ear-formation-stage-on-rice-seed-setting
#7
Shu Qing Ma, Xiao Hang Liu, Kui Cai Deng, Hu Jie Quan, Li Yuan Tong, Zhu Xiang Xi, Qing Rong Chai, Jun Yang
A low temperature treatment in rice booting key period was executed on the north slope of Changbai Mountains to construct the impact model of low temperature on rice shell rate, and to reveal the effects of low temperature at different stages of rice young panicle on seed setting. The results showed that effects of low temperature in the young ear formation stage on rice shell rate generally followed the logarithmic function, the lower the temperature was, the greater the temperature influence coefficient was, and the longer the low temperature duration was, the higher rice shell rate was...
January 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692006/-simulation-on-photosynthetic-co-2-response-of-quercus-variabilis-and-robinia-pseudoacacia-in-the-southern-foot-of-the-taihang-mountain-china
#8
Bo Ren, Jun Li, Xiao Juan Tong, Yan Mei Mu, Ping Meng, Jin Song Zhang
In this study, leaf photosynthetic CO2 -response curves of Quercus variabilis and Robinia pseudoacacia were measured using a Li-6400XT photosynthetic measurement system in the southern foot of the Taihang Mountain, China. The rectangular hyperbola model (RH), nonrectangular hyperbola model (NRH) andYe model (YZP) were used to fit photosynthetic-CO2 response curves and compare photosynthetic parameters, including the maximum net photosynthetic rate (Amax ), the initial carboxylation rate (η), light respiration rate (Rp ), CO2 compensation point (CCP) and CO2 saturation point (CSP)...
January 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29691928/circadian-rhythms-refractive-development-and-myopia
#9
Ranjay Chakraborty, Lisa A Ostrin, Debora L Nickla, P Michael Iuvone, Machelle T Pardue, Richard A Stone
PURPOSE: Despite extensive research, mechanisms regulating postnatal eye growth and those responsible for ametropias are poorly understood. With the marked recent increases in myopia prevalence, robust and biologically-based clinical therapies to normalize refractive development in childhood are needed. Here, we review classic and contemporary literature about how circadian biology might provide clues to develop a framework to improve the understanding of myopia etiology, and possibly lead to rational approaches to ameliorate refractive errors developing in children...
May 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29691890/synthesis-and-in-vitro-pdt-evaluation-of-new-porphyrins-containing-meso-epoxymethylaryl-cationic-groups
#10
Jaqueline Carneiro, Alan Gonçalves, Zehua Zhou, Kaitlin E Griffin, Nichole E M Kaufman, Maria da Graça Henriques Vicente
OBJECTIVES: Photodynamic therapy (PDT) is an effective cancer treatment that uses photosensitizers, light, and oxygen to destroy malignant cells. Porphyrins, and in particular the cationic derivatives, are the most investigated photosensitizers for PDT. In this context, it is important to study new methodologies to develop efficient cationic photosensitizers for use in PDT. MATERIALS AND METHODS: New porphyrins bearing cationic epoxymethylaryl groups were synthesized and characterized...
April 25, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29691873/understanding-emulsifiers-effect-on-bread-aeration-during-breadmaking
#11
Raquel Garzón, Isabel Hernando, Empar Llorca, Cristina M Rosell
BACKGROUND: Much research has been done to explain emulsifiers action during breadmaking, but there is still plenty unknown to elucidate their functionality despite their diverse chemical structure. The aim of the present study was to provide some light about the role of emulsifiers on air incorporation into the dough and gas bubbles progress during baking and their relationship with bread features. Emulsifiers like diacetyl tartaric acid ester of monoglycerides (DATEM), sodium stearoyl lactylate (SSL), distilled monoglyceride (DMG-45 and DMG-75), lecithin and polyglycerol esters of fatty acids (PGEF) were tested in very hydrated doughs...
April 24, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29691867/progress-towards-pig-nutrition-in-the-last-27-years
#12
REVIEW
Yi Wu, Jianfei Zhao, Chenchen Xu, Ning Ma, Ting He, Jinshan Zhao, Xi Ma, Phil A Thacker
Over the last 27 years (1990-2017), based on the revolutionary progresses of basic nutrition research, novel methods and techniques have been developed which bring a profound technological revolution to pig production from free-range system to intensive farming all over the world. Basic theoretical innovations and feed production studies have provided vital advancements in pig nutrition by developing formula feed, utilizing balanced diets, determining feed energy value, dividing pig physiological stages, enhancing gut health, and improving feed processing technique...
April 24, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29691740/integration-of-a-photocatalytic-multi-tube-reactor-for-indoor-air-purification-in-hvac-systems-a-feasibility-study
#13
Jeroen van Walsem, Jelle Roegiers, Bart Modde, Silvia Lenaerts, Siegfried Denys
This work is focused on an in-depth experimental characterization of multi-tube reactors for indoor air purification integrated in ventilation systems. Glass tubes were selected as an excellent photocatalyst substrate to meet the challenging requirements of the operating conditions in a ventilation system in which high flow rates are typical. Glass tubes show a low-pressure drop which reduces the energy demand of the ventilator, and additionally, they provide a large exposed surface area to allow interaction between indoor air contaminants and the photocatalyst...
April 24, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29691705/retinal-dysfunction-in-a-presymptomatic-patient-with-huntington-s-disease
#14
Jonelle Knapp, Dean A VanNasdale, Keith Ramsey, Julie Racine
PURPOSE: Huntington's disease (HD) is an autosomal dominant, neurodegenerative disorder characterized by progressive motor dysfunction, cognitive decline, and psychiatric disturbances. Studies have shown retinal abnormalities in patients and mouse models with HD; however, to our knowledge, no prior research papers evaluated retinal structure and function in a presymptomatic patient with HD. The aim of this report is to present a case of retinal dysfunction in a presymptomatic patient with HD...
April 24, 2018: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/29691666/hydroxamic-acid-derivatives-as-histone-deacetylase-inhibitors-a-dft-study-of-their-tautomerism-and-metal-affinities-selectivities
#15
D Cheshmedzhieva, N Toshev, M Gerova, O Petrov, T Dudev
Hydroxamic acids are regarded as potent inhibitors of histone deacetylases (HDAC), and can therefore be used to reduce malignancy growth and size in affected organisms. Although there is a substantial body of information on the structures, syntheses, and biological activities of HDAC inhibitors, several important questions regarding their physicochemical properties and metal affinities/selectivities remain answered. First, how do the conformation and ionization of the hydroxamic group depend on its chemical composition and the dielectric properties of the medium? Second, how do these factors affect the affinities and selectivities of HDAC inhibitors for essential biogenic metal cations? Third, what is the preferred deprotonation site of the hydroxamic moiety and its mode of binding to the metal cation? The present work addressed these questions by performing density functional calculations combined with polarizable continuum model computations...
April 24, 2018: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29691662/microleakage-of-composite-crowns-luted-on-cad-cam-milled-human-molars-a-new-method-for-standardized-in-vitro-tests
#16
Maximiliane Amelie Schlenz, Alexander Schmidt, Peter Rehmann, Thomas Niem, Bernd Wöstmann
OBJECTIVES: To investigate debonding of full crowns made of CAD/CAM composites, CAD/CAM technology was applied to manufacture standardized test abutments to increase the reproducibility of human teeth used in in vitro studies. MATERIALS AND METHODS: A virtual test abutment and the corresponding virtual crown were designed and two STL data sets were generated. Sixty-four human third molars and CAD/CAM blocks were milled using a CNC machine. Crowns of four different composite blocks (Lava Ultimate (LU), Brilliant Crios (BC), Cerasmart (CS), Experimental (EX)) were adhesively bonded with their corresponding luting system (LU: Scotchbond Universal/RelyX Ultimate; BC: One Coat 7 Universal/DuoCem; CS: G-PremioBond/G-Cem LinkForce; EX: Experimental-Bond/Experimental-Luting-Cement)...
April 24, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29691648/diversity-biomass-relationship-across-forest-layers-implications-for-niche-complementarity-and-selection-effects
#17
Sylvanus Mensah, Ben du Toit, Thomas Seifert
Forest stratification plays a crucial role in light interception and plant photosynthetic activities. However, despite the increased number of studies on biodiversity-ecosystem function, we still lack information on how stratification in tropical forests modulates biodiversity effects. Moreover, there is less investigation and argument on the role of species and functional traits in forest layers. Here, we analysed from a perspective of forest layer (sub-canopy, canopy and emergent species layers), the relationship between diversity and aboveground biomass (AGB), focusing on functional diversity and dominance, and underlying mechanisms such as niche complementarity and selection...
April 24, 2018: Oecologia
https://www.readbyqxmd.com/read/29691634/the-ctenidium-of-the-giant-clam-tridacna-squamosa-expresses-an-ammonium-transporter-1-that-displays-light-suppressed-gene-and-protein-expression-and-may-be-involved-in-ammonia-excretion
#18
Mel V Boo, Kum C Hiong, Enan J K Goh, Celine Y L Choo, Wai P Wong, Shit F Chew, Yuen K Ip
Ammonium transporters (AMTs) can participate in ammonia uptake or excretion across the plasma membrane of prokaryotic, plant and invertebrate cells. The giant clam, Tridacna squamosa, harbors nitrogen-deficient symbiotic zooxanthellae, and normally conducts light-enhanced ammonia absorption to benefit the symbionts. Nonetheless, it can excrete ammonia when there is a supply of exogenous nitrogen or exposed to continuous darkness. This study aimed to elucidate the role of AMT1 in the ctenidium of T. squamosa by cloning and characterizing the AMT1/AMT1, determining its subcellular localization, and examining changes in its transcript and protein expression levels in response to light exposure...
April 24, 2018: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/29691628/performance-of-the-mixed-led-light-quality-on-the-growth-and-energy-efficiency-of-arthrospira-platensis
#19
Ruixin Mao, Shuangsheng Guo
The effect of mixed light quality with red, blue, and green LED lamps on the growth of Arthrospira platensis was studied, so as to lay the theoretical and technical basis for establishing a photo-bioreactor lighting system for application in space. Meanwhile, indexes, like morphology, growth rate, photosynthetic pigment compositions, energy efficiency, and main nutritional components, were measured respectively. The results showed that the blue light combined with red light could decrease the tightness of filament, and the effect of green light was opposite...
April 24, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29691537/design-and-synthesis-of-functionalized-coordination-polymers-as-recyclable-heterogeneous-photocatalysts
#20
Cai-Ping Ye, Gan Xu, Zheng Wang, Jie Han, Lian Xue, Fu-Yu Cao, Qi Zhang, Lin-Feng Yang, Li-Zhou Lin, Xu-Dong Chen
The functionalized ligand 9,10-anthraquinone-1,4-dicarboxylate acid (H2AQDC) was designed and synthesized in order to develop metal-organic coordination polymers as heterogeneous catalysts with a photosensitizing feature. Two major considerations of the ligand design are anthraquinone moieties for photosensitizing to harvest light and carboxylate groups for polymeric coordination toward less solubility. A series of transition metal complexes based on this ligand were synthesized subsequently, namely {Co(AQDC)(H2O)3·2H2O}n (Co-AQDC), {Ni(AQDC)(H2O)3·2H2O}n (Ni-AQDC), {[Cu(AQDC)(H2O)3][Cu(AQDC)(H2O)2(DMF)]·(H2O)4}n (Cu-AQDC), {Zn1...
April 25, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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