903,455 results match your criteria temperature


Association between body temperature and leukocyte telomere length in middle-aged and older adults.

Epidemiol Health 2021 Sep 8:e2021063. Epub 2021 Sep 8.

Department of Foods and Nutrition, College of Natural Sciences, Kookmin University, 02707 Seoul, Republic of Korea.

Objectives: Data on the association between body temperature (BT) and leukocyte telomere length (LTL), which has been widely used as a biomarker of cellular senescence in recent epidemiological studies, are limited. Aims: The present study aimed to explore the association between a normal BT range (35.0 to 37. Read More

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September 2021

High-temperature oxidation and reduction of the inverse ceria/Cu(111) catalyst characterized by LEED, STM, nc-AFM and KPFM.

J Phys Condens Matter 2021 Sep 15. Epub 2021 Sep 15.

CNRS, CINaM UMR7325, Campus de Luminy, Case 913, Marseille Cedex 09, Provence, 13288, FRANCE.

The inverse catalyst 'cerium oxide (ceria) on copper' has attracted much interest in recent time because of its promising catalytic activity in the water-gas-shift reaction and the hydrogenation of CO. For such reactions it is important to study the redox behaviour of this system, in particular with respect to the reduction by H. Here, we investigate the high-temperature Ooxidation and Hreduction of ceria nanoparticles (NP) and a Cu(111) support by low energy electron diffraction (LEED), scanning tunnelling microscopy (STM), noncontact atomic force microscopy (nc-AFM) and Kelvin probe force microscopy (KPFM). Read More

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September 2021

Nonlinear power dependence of ferromagnetic resonance in NiFe/Pt/CoFeB trilayer.

J Phys Condens Matter 2021 Sep 15. Epub 2021 Sep 15.

Physics Department, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Fukuoka, Fukuoka, 819-0395, JAPAN.

The static and dynamic magnetization properties for a NiFe/Pt/CoFeB tri-layered film have been investigated. We find that the two ferromagnetic layers separated by a Pt spacer are ferromagnetically coupled even at room temperature. Moreover, the damping constant for the NiFe layer is found to show the significant enhancement with non-linear power dependence. Read More

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September 2021

Study of the structure of a multicomponent salt melt using molecular dynamics modeling.

J Phys Condens Matter 2021 Sep 15. Epub 2021 Sep 15.

Ural Branch of Russian Academy of Sciences, Institute of High-Temperature Electrochemistry, Sofia Kovalevskaya Str., 22, Yekaterinburg, 620990, RUSSIAN FEDERATION.

The composition of the electrolyte is critical in the electrodeposition of high-purity silicon. In this work, molecular dynamics modeling of the preparation of liquid salt melt KF-KCl-KI and a detailed study of its structure based on the method of statistical geometry have been performed. Partial radial distribution functions reflect the size of the ions under consideration and the averaged structure of the generated ionic subsystems. Read More

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September 2021

Artificial light pollution inhibits plant phenology advance induced by climate warming.

Environ Pollut 2021 Sep 6;291:118110. Epub 2021 Sep 6.

School of Resource and Environmental Sciences, Wuhan University, Wuhan, 430079, China; Key Laboratory of Geographic Information System, Ministry of Education, Wuhan University, Wuhan, 430079, China. Electronic address:

Natural photic regime has been drastically altered by the artificial night sky luminance. Despite evidence of sufficient light brightness inducing plant physiology and affecting phenology, generalization regarding effects of light pollution on plant phenology across species and locations is less clear. Meanwhile, the relative contributions and joint effects of artificial light pollution and climate change or other anthropic stressors still remain unknown. Read More

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September 2021

Enantioselective liquid-liquid extraction of tryptophan enantiomers by a recyclable aqueous biphasic system based on stimuli-responsive polymers.

J Chromatogr A 2021 Sep 4;1656:462532. Epub 2021 Sep 4.

Institute of Bast Fiber Crops and Center of Southern Economic Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China. Electronic address:

The hydrophobic organic solvents/water biphasic system had been always used in the traditional enantioselective liquid-liquid extraction (ELLE). In recent years, aqueous biphasic systems (ABSs) are considered as a promising method used in the ELLE. In the present work, a recyclable ABS composed of a temperature-responsive polymer poly(MAH-β-CD-co-NIPAAm) (P) and a pH-responsive polymer poly(AA-DMAEMA-BMA) (P) was employed in the enantioseparation of tryptophan enantiomers. Read More

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September 2021

Reprocessing of Covalent Adaptable Polyamide Networks through Internal Catalysis and Ring-Size Effects.

J Am Chem Soc 2021 Sep 15. Epub 2021 Sep 15.

Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281-S4, Ghent 9000, Belgium.

Here, we report the introduction of internally catalyzed amide bonds to obtain covalent adaptable polyamide networks that rely on the dissociation equilibrium between dicarboxamides and imides. While amide bonds are usually considered to be robust and thermally stable, the present study shows that their dynamic character can be activated by a smart choice of available building blocks without the addition of any external catalyst or other additives. Hence, a range of polyamide-based dynamic networks with variable mechanical and viscoelastic properties have been obtained in a systematic study, using a straightforward curing process of dibasic ester and amine compounds. Read More

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September 2021

Infection Dynamics of Batrachochytrium dendrobatidis In Two Frog Species Inhabiting Quito'S Metropolitan Guangüiltagua Park, Ecuador.

J Wildl Dis 2021 Sep 15. Epub 2021 Sep 15.

Escuela de Medicina Veterinaria, Facultad de Ciencias de la Salud, Universidad de Las Américas, Vía Nayón S/N, Quito 170124, Ecuador.

Batrachochytrium dendrobatidis (Bd) infection is one of the principal causes of amphibian declines worldwide. The presence of Bd has been determined in Gastrotheca riobambae tadpoles that inhabit ponds in Quito's Metropolitan Guangüiltagua Park, Ecuador. This study sought to determine whether these tadpoles are infected and to determine the presence of chytridiomycosis in another frog species, Pristimantis unistrigatus, which also inhabits the park and has different reproductive biology and distinct behavioral habits. Read More

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September 2021

Kinetics and energetic analysis of the slow dispersive electron transfer from nano-TiO to O by diffusion reflectance and Laplace transform.

Phys Chem Chem Phys 2021 Sep 15;23(35):19901-19910. Epub 2021 Sep 15.

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan City, Hubei Province 430070, P. R. China.

Electron transfer to O is a universally existing process for the physiochemistry of many materials. Electron transfer to O is also an inevitable process for photocatalytic reactions over TiO and other materials. In the present research, a diffusion reflectance system was developed to measure optical diffusion reflectances caused by photoinduced electrons in nano-TiO under a steady light illumination; absorption decays can be obtained to study the electron transfer from their trapped states to O. Read More

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September 2021

A simulation study on the effect of nanoparticle size on the glass transition temperature of polymer nanocomposites.

Soft Matter 2021 Sep 15;17(35):8095-8104. Epub 2021 Sep 15.

Department of Physics, Zhejiang University, Hangzhou 310027, China.

The effect of the size of nanoparticles, , on the glass transition temperature, , of polymer nanocomposites is studied by using molecular dynamics simulations. The variation of with shows two distinct behaviours for polymer nanocomposites at low and high volume fractions of nanoparticles (). At a low , decays almost exponentially with , whereas at a high shows a complex behaviour: it initially increases and then decreases with increasing . Read More

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September 2021

Modeling magnetic interactions in high-valent trinuclear [MnO] complexes through highly compressed multi-configurational wave functions.

Phys Chem Chem Phys 2021 Sep 15;23(35):19766-19780. Epub 2021 Sep 15.

Department of Electronic Structure Theory, Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.

In this work we apply a quantum chemical framework, recently designed in our laboratories, to rationalize the low-energy electronic spectrum and the magnetic properties of an homo-valent trinuclear [MnO] model of the oxygen-evolving center in photosystem II. The method is based on chemically motivated molecular orbital unitary transformations, and the optimization of spin-adapted many-body wave functions, both for ground- and excited-states, in the transformed MO basis. In this basis, the configuration interaction Hamiltonian matrix of exchange-coupled multi-center clusters is extremely sparse and characterized by a unique block diagonal structure. Read More

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September 2021

Mechanism and equilibrium thermodynamics of H- and J-aggregate formation from pseudo isocyanine chloride in water.

Soft Matter 2021 Sep 15;17(35):8140-8152. Epub 2021 Sep 15.

Physical Chemistry, Paderborn University, 33098 Paderborn, Germany.

Pseudo isocyanine chloride (PIC) has a strong tendency to self-assemble with a concentration dependent temperature threshold separating a regime with small H-oligomers in equilibrium with monomeric PIC from a regime where large J-aggregates form. In complementing the known set of absorption spectra by the spectrum of a trimer, which represents all H-aggregates with ≥ 3, a full description of the sample composition of PIC in the regime of oligomers became possible by means of UV-vis spectroscopy and gave access to the equilibrium thermodynamics of oligomerisation. Successful interpretation of the concentration dependent temperature threshold as a ceiling temperature of J-aggregation made also accessible equilibrium thermodynamics of the formation of J-aggregates together with a full analysis of composition also in the regime of J-aggregates. Read More

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September 2021

Local structuring of diketopyrrolopyrrole (DPP)-based oligomers from molecular dynamics simulations.

Phys Chem Chem Phys 2021 Sep 15;23(35):19693-19707. Epub 2021 Sep 15.

Department of Chemistry, University of Liverpool, Crown Place, Liverpool, L69 7ZD, UK.

The microscopic structure of high mobility semiconducting polymers is known to be essential for their performance but it cannot be easily deduced from the available experimental data. A series of short oligomers of diketopyrrolopyrrole (DPP)-based materials that display high charge mobility are studied by molecular dynamics simulations to understand their local structuring at an atomic level. Different analyses are proposed to compare the ability of different oligomers to form large aggregates and their driving force. Read More

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September 2021

Air separation via two-step solar thermochemical cycles based on SrFeO and (Ba,La)SrFeO perovskite reduction/oxidation reactions to produce N: rate limiting mechanism(s) determination.

Phys Chem Chem Phys 2021 Sep 15;23(35):19280-19288. Epub 2021 Sep 15.

George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30332-0405, USA.

Two-step solar thermochemical cycles based on reversible reactions of SrFeO and (Ba,La)SrFeO perovskites were considered for air separation. The cycle steps encompass (1) the thermal reduction of SrFeO or (Ba,La)SrFeO perovskites driven by concentrated solar irradiation and (2) oxidation in air to remove O and produce N. Rate limiting mechanisms were examined for both reactions using a combination of isothermal and non-isothermal thermogravimetry for temperature-swings between 673 and 1373 K, heating rates of 10, 20, and 50 K min, and O pressure-swings between 20% O/Ar and 100% Ar at atmospheric pressure. Read More

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September 2021

Understanding the close encounter of heme proteins with carboxylated multiwalled carbon nanotubes: a case study of contradictory stability trend for hemoglobin and myoglobin.

Phys Chem Chem Phys 2021 Sep 15;23(35):19740-19751. Epub 2021 Sep 15.

Department of Chemistry, University of Delhi, Delhi-110 007, India.

Carbon nanotubes (CNTs) are one of the unique and promising nanomaterials that possess plenty of applications, such as biosensors, advanced drug delivery systems and biotechnology. CNTs bind rapidly with proteins, which result in the formation of a protein coating layer known as a "protein corona" around the surface of the nanomaterial. This hinders their applications as a drug carrier and influences the properties of biological macromolecules. Read More

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September 2021

Ultra-low thermal conductivity and high thermoelectric performance of monolayer BiP: a first principles study.

Phys Chem Chem Phys 2021 Sep 15;23(35):19834-19840. Epub 2021 Sep 15.

School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.

The thermoelectric properties of monolayer triphosphide BiP are studied first principles calculations and Boltzmann transport equation. First, the Seebeck coefficient, electrical conductivity and electron thermal conductivity at different temperatures are calculated using the Boltzmann transport equation with relaxation time approximation. It has been observed that BiP has a large power factor (265 × 10 W K m, 700 K). Read More

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September 2021

Red-emitting InP quantum dot micro-disk lasers epitaxially grown on (001) silicon.

Opt Lett 2021 Sep;46(18):4514-4517

Direct epitaxy of InP quantum dot (QD) lasers on silicon (Si) provides an on-chip red laser source for integrated Si photonics with different applications. Here, we demonstrate the first, to the best of our knowledge, InP QD lasers directly grown on (001) Si. Combining highly emissive InP QDs and a GaAs/Si template with low defect density, continuous-wave (CW) lasing of micro-disk lasers (MDLs) on Si is achieved at room temperature. Read More

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September 2021

Acousto-Pi: An Opto-Acoustofluidic System using Surface Acoustic Waves controlled with Open Source Electronics for Integrated In-Field Diagnostics.

IEEE Trans Ultrason Ferroelectr Freq Control 2021 Sep 15;PP. Epub 2021 Sep 15.

Surface acoustic wave (SAW) devices are increasingly applied in life science, biology, and point-of-care applications due to their combined acoustofluidic sensing and actuating properties. Despite the advances in this field, there remain significant gaps in interfacing hardware and control strategies to facilitate system integration with high performance and low cost. In this work, we present a versatile, and digitally controlled acoustofluidic platform by demonstrating key functions for biological assays such as droplet transportation and mixing using a closed-loop feedback control with image recognition. Read More

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September 2021

Image correlation-based method to assess ciliary beat frequency in human airway organoids.

IEEE Trans Med Imaging 2021 Sep 15;PP. Epub 2021 Sep 15.

Ciliary movements within the human airway are essential for maintaining a clean lung environment. Motile cilia have a characteristic ciliary beat frequency (CBF). However, CBF measurement with current video microscopic techniques can be error-prone due to the use of the single-point Fourier transformation, which is often biased for ciliary measurements. Read More

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September 2021

Isolation and Characterization of a Novel Laccase LacZ1 for Lignin Degradation.

Appl Environ Microbiol 2021 Sep 15:AEM0135521. Epub 2021 Sep 15.

Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, People's Republic of China.

Lignin is a complex natural organic polymer and is one of the primary components of lignocellulose. The efficient utilization of lignocellulose is limited because it is difficult to degrade lignin. In this study, we screened a gene fragment encoding laccase from the macro transcriptome data of a microbial consortium WSC-6, which can efficiently degrade lignocellulose. Read More

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September 2021

Distinct assembly processes and determinants of soil microbial communities between farmland and grassland in arid and semiarid areas.

Appl Environ Microbiol 2021 Sep 15:AEM0101021. Epub 2021 Sep 15.

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.

It is critical to identify the assembly processes and determinants of soil microbial communities to better predict soil microbial responses to environmental change in arid and semiarid areas. Here, soils from 16 grassland-only, 9 paired grassland and farmland, and 16 farmland-only sites were collected across the central Inner Mongolia Plateau covering a steep environmental gradient. Through analyzing the paired samples, we discovered that land uses had strong effects on soil microbial communities, but weak effects on their assembly processes. Read More

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September 2021

First Report of Post-Harvest Gray Mold on Hyacinth bean () Caused by in Korea.

Plant Dis 2021 Sep 15. Epub 2021 Sep 15.

National Academy of Agricultural Science, Crop Protection Division, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea, Wanju, Korea (the Republic of), 55365;

Hyacinth bean ( L.) is a highly proteineous legume under the family . It is native to Africa, cultivated throughout the world, and recently introduced vegetable in Korea. Read More

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September 2021

Temperature-Dependent Conformational Evolution of SARS CoV-2 RNA Genome Using Network Analysis.

J Phys Chem B 2021 Sep 15. Epub 2021 Sep 15.

Biophysical and Computational Chemistry Laboratory, Department of Chemistry, National Institute of Technology Karnataka, Mangalore, Karnataka 575025, India.

Understanding the dynamics of the SARS CoV-2 RNA genome and its dependence on temperature is necessary to fight the current COVID-19 crisis. Computationally, the handling of large data is a major challenge in the elucidation of the structures of RNA. This work presents network analysis as an important tool to see the conformational evolution and the most dominant structures of the RNA genome at six different temperatures. Read More

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September 2021

Shedding Light on Thermally Induced Optocapacitance at the Organic Biointerface.

J Phys Chem B 2021 Sep 15. Epub 2021 Sep 15.

Department of Physics, Politecnico di Milano, 20133 Milan, Italy.

Photothermal perturbation of the cell membrane is typically achieved using transducers that convert light into thermal energy, eventually heating the cell membrane. In turn, this leads to the modulation of the membrane electrical capacitance that is assigned to a geometrical modification of the membrane structure. However, the nature of such a change is not understood. Read More

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September 2021

Acrylic Paints: An Atomistic View of Polymer Structure and Effects of Environmental Pollutants.

J Phys Chem B 2021 Sep 15. Epub 2021 Sep 15.

Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

Most of the artwork and cultural heritage objects are stored in museums under conditions that are difficult to monitor. While advanced technologies aim to control and prevent the degradation of cultural heritage objects in line with preventive conservation measures, there is much to be learned in terms of the physical processes that lead to the degradation of the synthetic polymers that form the basis of acrylic paints largely used in contemporary art. In museums, stored objects are often exposed to temperature and relative humidity fluctuations as well as airborne pollutants such as volatile organic compounds (VOCs). Read More

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September 2021

Ionic Hydrogels Based Wearable Sensors to Monitor the Solar Radiation Dose for Vitamin D Production and Sunburn Prevention.

ACS Appl Mater Interfaces 2021 Sep 15. Epub 2021 Sep 15.

Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 928 Second Avenue, 310018 Hangzhou, China.

Wearable solar radiation sensors based on ionic hydrogels are facilely prepared to simultaneously monitor the radiation dose for the production of vitamin D and the prevention of sunburn. Tetramethylethylenediamine (TEMED) is neutralized with acrylic acid (AA) to obtain tetramethylethylenediamine acrylate (TEMEDA), which is further polymerized with acrylamide by a free radical reaction. By simply adding MB or NR during the polymerization, the final obtained ionic hydrogels can indicate solar radiation. Read More

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September 2021

Strong Structural Modification of Gd to CoO for Catalyzing NO Decomposition under Simulated Real Tail Gases.

Environ Sci Technol 2021 Sep 15. Epub 2021 Sep 15.

College of Chemistry, Liaoning University, Shenyang 110036, PR China.

In this paper, Gd-promoted CoO catalysts were prepared via a facile coprecipitation method for low-temperature catalytic NO decomposition. Due to the addition of Gd, the crystallite size of CoO in the GdCo catalyst surprisingly decreased to 4.9 nm, which is much smaller than most additive-modified CoO catalysts. Read More

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September 2021

Ratiometric Fluorescence Imaging of Intracellular MicroRNA with NIR-Assisted Signal Amplification by a [email protected] Nanoplatform.

ACS Appl Mater Interfaces 2021 Sep 15. Epub 2021 Sep 15.

Zhangdayu School of Chemistry, Dalian University of Technology, Dalian 116023, P. R. China.

Accurate and sensitive fluorescence imaging of intracellular miRNA is essential for understanding the mechanism underlying some physiological and pathological events, as well as the prevention and diagnosis of diseases. Herein, a highly sensitive ratiometric fluorescent nanoprobe for intracellular miRNA imaging was fabricated by integrating a [email protected] ([email protected]) nanoplatform with a near-infrared light (NIR)-assisted DNA strand displacement signal amplification strategy. The [email protected] spheres have excellent biosafety, high photothermal effect, and unique photophysical properties that can both emit a stable red fluorescence and well quench the fluorophores getting closer to them. Read More

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September 2021

WATER QUALITY INFLUENCE ON MACROINVERTEBRATE COMMUNITY IN A TROPICAL ESTUARY (BUENAVENTURA BAY).

Integr Environ Assess Manag 2021 Sep 15. Epub 2021 Sep 15.

Universidad Santiago de Cali, Facultad de Ciencias Básicas.

The anthropogenic discharges of inorganic nutrients impact water quality affecting the macroinvertebrate assemblage and food safety. The main objective was to examine the seawater quality and macroinvertebrate dynamics in muddy habitats of Buenaventura Bay, Colombian Pacific. Macroinvertebrates were captured using artisanal trawl nets during different seasons and along four sampling sites. Read More

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September 2021

Assessment of biochemical compounds and antioxidant enzyme activity in barley and wheatgrass under water deficit condition.

J Sci Food Agric 2021 Sep 15. Epub 2021 Sep 15.

Department of Food Science and Biotechnology, Gachon University, Seongnam, 13120, Republic of Korea.

Background: Wheatgrass and barley grass are freshly sprouted leaves of wheat and barley seeds and are rich sources of phytochemicals. This study was conducted to investigate the effects of drought stress on the biochemical compounds and antioxidant activities of barley and wheatgrass extracts. The grass was cultivated in the organic soil growing medium with different drought stress, mainly control with 100% water holding capacity (WHC), mild drought-stress with 75% WHC, moderate drought-stress with 50% WHC, and severe drought stress with 25% WHC in a growth chamber by controlling temperature (20/15 °C, day/night), light (12/12 h, light/dark; intensity 150 μmol m s with quantum dot light-emitting diodes), and relative humidity (60%) for 7-days. Read More

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September 2021