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oe1(光电查) - 科学论文

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  • A molecular hybrid producing simultaneously singlet oxygen and nitric oxide by single photon excitation with green light

    摘要： Combination of photosensitizers (PS) for photodynamic therapy with NO photodonors (NOPD) is opening intriguing horizons towards new and still underexplored multimodal anticancer and antibacterial treatments not based on “conventional” drugs and entirely controlled by light stimuli. In this contribution, we report an intriguing molecular hybrid based on a BODIPY light-harvesting antenna that acts simultaneously as PS and NOPD upon single photon excitation with the highly biocompatible green light. The presented hybrid offers a combination of superior advantages with respect to the other rare cases reported to date, meeting most of the key criteria for both PSs and NOPDs in the same molecular entity such as: (i) capability to generate 1O2 and NO with single photon excitation of biocompatible visible light, (ii) excellent 1O2 quantum yield and NO quantum efficiency, (iii) photogeneration of NO independent from the presence of oxygen, (iv) large light harvesting properties in the green region. Furthermore, this compound together with its stable photoproduct, is well tolerated by both normal and cancer cells in the dark and exhibits bimodal photomortality of cancer cells under green light excitation due to the combined action of the cytotoxic 1O2 and NO.

    关键词： Green light,Nitric oxide,Multimodal therapy,Singlet oxygen,BODIPY,Photodynamic therapy

    更新于2025-09-23 15:22:29

  • Physiological responses of pepper seedlings to various ratios of blue, green, and red light using LED lamps

    摘要： Chlorophyll absorbs green light less e?ciently than it absorbs other wavelengths in the visible spectrum so green light drives photosynthesis less e?caciously. Green light emitting diodes (LEDs) are also less e?cacious at converting electrical energy into photons than their red and blue counterparts. Consequently, most photosynthetic LED lighting has been designed without including green wavelengths in the spectrum. Plant physiological research has largely focused on light signal responses to red, far-red and blue light, but recent e?orts suggest other wavebands may play an important role in plant development and photosynthetic activity. We have examined the role of monochromatic red, blue and green light and combinations of these colors with regard to seedling growth of bell pepper. The shoots of pepper plants grown under monochromatic green light had greater leaf area and lower speci?c leaf weight (mg cm?2) than those grown under monochromatic blue or red light. Green light also resulted in taller plants with greater dry weight and thicker stems relative to plants grown with blue light. A broad spectrum including red, green, and blue wavelengths resulted in the highest shoot dry weight and plant compactness.

    关键词： Plant physiology,Green light,Blue light,Capsicum annuum,Red light,Light emitting diode

    更新于2025-09-23 15:21:01

  • High Emission Quantum Yield Tb <sup>3+</sup> -Activated Organic-Inorganic Hybrids for UV-Down-Shifting Green Light-Emitting Diodes

    摘要： Solid-state light-emitting diodes (LEDs) are driving the lighting industry towards efficient and environmentally friendly lighting and displays. Current challenges encompass efficient and low-cost down-shifting phosphors with tuned emission colors. Green light lies on the low-loss optical transmission window in plastic optical fibers and plays a special role in human and plants circadian rhythm regulation. Moreover, green-emitting phosphors may suppress the ‘green gap’ found in semiconductor-based LEDs. In this work, a UV-photostable Tb(NaI)3(H2O)2, with (1-ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-NaI= nalidixic naftiridine-3-carboxylic acid), was incorporated into tripodal organic-inorganic hybrid materials. The hybrid hosts boost the absolute emission quantum yield from ~0.11 (isolated complex) to ~0.82 (doped hybrid), being the largest value reported for Tb3+-based hybrid phosphors. A green-emitting LED was fabricated by coating a near-UV LED (365 nm) with a Tb3+-activated organic-inorganic hybrid showing pure-green light with Commission International de l’Eclairage color coordinates and an efficacy value of (0.33, 0.59) and 1.3 lm·W?1, respectively.

    关键词： near-UV light-emitting diodes,green light-emitting diodes,lanthanides,solid-state lighting,organic-inorganic hybrids

    更新于2025-09-23 15:21:01

  • [American Society of Agricultural and Biological Engineers 2018 Detroit, Michigan July 29 - August 1, 2018 - ()] 2018 Detroit, Michigan July 29 - August 1, 2018 - &lt;i&gt;The dose-effect relationships between green light and metabolism rate in chick embryos&lt;/i&gt;

    摘要： Green light during artificial incubation can affect the development of chick embryos. However, there has been relatively little work systematically assessing dose-effect relationships between green light and metabolism rate in chick embryos. Eggs (n=800) were incubated under photoperiods of either 0 h of light and 24 h of darkness (0L:24D), 6 h of light and 18 h of darkness (6L:18D), 12 h of light and 12 h of darkness (12L:12D), or 18 h of light and 6 h of darkness (18L:6D). In accordance with dose-effect on embryonic development, the response of carbon dioxide production rate to variations in illuminance was consistent with lipid reserve in yolk residue and hepatic glycogen in chick embryos. This sensitivity to green light indicates that the variation in illuminance within certain range of green light can have a significant impact on embryonic development and metabolic rate in chick embryos during artificial incubation. The results of this study indicate that providing 18 h of green light during incubation can have significantly improved the development and metabolism of the chick embryos.

    关键词： chick embryos,metabolism rate,artificial incubation,green light

    更新于2025-09-23 15:21:01

  • Comparison of photoselective green light laser vaporisation versus traditional transurethral resection for benign prostate hyperplasia: an updated systematic review and meta-analysis of randomised controlled trials and prospective studies

    摘要： Objective To assess the efficacy and safety of green-light laser photoselective vaporisation of the prostate (PVP) compared with transurethral resection of the prostate (TURP) for lower urinary tract symptoms (LUTS) secondary to benign prostatic hyperplasia (BPH). Design Systematic review and meta-analysis, conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement. Data sources PubMed, EMBASE, the Cochrane Library until October 2018. Eligibility criteria Randomised controlled trials and prospective studies comparing the safety and efficacy of PVP versus TURP for LUTS manifesting through BPH. Data extraction and synthesis Perioperative parameters, complications rates and functional outcomes including treatment-related adverse events such as International Prostate Symptom Score (IPSS), maximum flow rate (Qmax), postvoid residual (PVR), quality of life (QoL) and International Index of Erectile Function (IIEF). results 22 publications consisting of 2665 patients were analysed. Pooled analysis revealed PVP is associated with reduced blood loss, transfusion, clot retention, TUR syndrome, capsular perforation, catheterisation time and hospitalisation, but also with a higher reintervention rate and longer intervention duration (all p<0.05). No significant difference in IPSS, Qmax, QoL, PVR or IIEF at 3, 24, 36 or 60 months was identified. There was a significant difference in QoL at 6 months (MD=?0.08; 95% CI ?0.13 to ?0.02; p=0.007), and IPSS (MD = ?0.10; 95% CI ?0.15 to ?0.05; p<0.0001) and Qmax (MD=0.62; 95% CI 0.06 to 1.19; p=0.03) at 12 months, although these differences were not clinically relevant. Conclusion PVP is an effective alternative, holding additional safety benefits. PVP has equivalent long-term IPSS, Qmax, QoL, PVR, IIEF efficacy and fewer complications. The main drawbacks are dysuria and reintervention, although both can be managed with non-invasive techniques. The additional shortcoming is that PVP does not acquire histological tissue examination which removes an opportunity to identify prostate cancer.

    关键词： PVP,transurethral resection of the prostate,benign prostatic hyperplasia,photoselective vaporization of the prostate,BPH,green-light laser,vaporization,TURP

    更新于2025-09-19 17:13:59

  • Green-light-induced melting of self-assembled azobenzene nano/microstructures

    摘要： We report the formation of green-light-responsive fluorescent aggregates composed of trigonal molecules having three ortho-dialkylated azobenzene wings at the periphery (a green-light-responsive 3BuES and an aggregation-induced emission/aggregation-induced emission enhancement [AIE/AIEE]-active 3BuAz). Exposure of the respective (3BuES and 3BuAz) spheres to green light leads to color tuning and/or fluorescence switching. The results can be rationalized in terms of green-light-induced molecular conformational changes of the trigonal azobenzene molecules and the resulting phase transition of the self-assembled structures. For instance, irradiation of 3BuES with green light produces B35% of U-shaped cis forms (i.e., approximately one-third of the trans-azobenzene units isomerizes to the cis forms), which seems to be su?cient to weaken the degree of the molecular packing of the trigonal azobenzene frameworks and lower the melting temperatures. Moreover, to apply the excellent fluorescence switching functions of 3BuAz aggregates to create new fluorescent organic materials, we used a co-assembly of 3BuES–3BuAz binary mixtures. Our important approach for obtaining green-light-responsive fluorescent nano/microstructures from the binary mixtures is phase separation based on the structural difference between 3BuES (having a planar central core) and 3BuAz (having a distorted conformation), which helps retain the fluorescence functions of the AIE/AIEE-active 3BuAz chromophore. Scanning electron microscopy (SEM), optical microscopy (OM), and fluorescence optical microscopy (FOM) observations prove apparent green-light-induced melting, color tuning and fluorescence switching of the phase-separated structures (i.e., microspheres and nanoparticles).

    关键词： green-light-responsive,AIE/AIEE,azobenzene,fluorescent aggregates,fluorescence switching,phase separation

    更新于2025-09-16 10:30:52

  • Surface with Reversible Green-light-switched Wettability by Donor-Acceptor Stenhouse Adducts

    摘要： In this report, we designed surfaces with reversible green-light-switched wettability by Donor-Acceptor Stenhouse adducts (DASAs). Photoresponsive micro/nanoparticles were prepared by coating polydopamine on the surface of silica micro/nanoparticles and then post-modifying with DASA molecules. Then, the particles were immobilized on glass substrates surface either by double-sided adhesive tapes or crosslinking polydimethylsiloxane. Silica micro/nanoparticles with various diameters (0.2, 2.5 and 85 μm) were used to fabricate the photoresponsive surface. Green light irradiation switches the hydrophobic linear DASA to hydrophilic cyclic isomer, which further increases the wettability and contact angle hysteresis on surface. On the other hand, heating (100 oC) induces the cyclic-to-linear isomerization of DASA molecules, and switches the surface back to hydrophobic. The wettability of the DASAs modified surface is reversible under alternately green light irradiating and heating.

    关键词： donor-acceptor Stenhouse adducts,green light,surface,photoresponsive system,wettability

    更新于2025-09-10 09:29:36

  • Application of Analytic Technique Using Green Light Parallel-Polarized Light Images in Various Skin Diseases

    摘要： Ordinary photography may not fully represent patients’ skin status, but digital photography using a consistent and appropriate light-emitting diode (LED) illuminator could provide more objective and reliable images and colorimetric data. Previous studies have shown that parallel-polarized light (PPL) images taken with green LED show more significant quantitative differences, depending on the state of the skin, than those taken with white LED. This study aimed to determine the skin diseases appropriate for an analytic technique using PPL images taken with green and white LEDs.

    关键词： green light,parallel-polarized light images,analytic technique,skin diseases

    更新于2025-09-04 15:30:14

  • Synthesis, Photophysical, Electrochemical and Thermal Study of Biphenyl Luminophors: Green Light Emitting Materials

    摘要： Novel luminophors of anthracene (AN) and tetracene (TN) doped biphenyl were prepared using Conventional Solid State reaction technique. Fluorescence spectroscopy, XRD, SEM, TGA-DSC and Cyclic Voltammetry techniques have been employed for photophysical, electrochemical and thermal study. The X-ray diffraction study revealed the formation of homogeneous biphenyl solid solutions with the added guests AN and TN. Fluorescent biphenyl absorbing short wave UV radiation and emitting at long wave UV radiation has been used as a solid matrix. From the fluorescence spectra it is seen that the added guests shifts the UV fluorescence of biphenyl emitting in green region of visible spectrum at 532 nm. SEM images of the prepared luminophors showed the crystallites of average size 140 nm which makes them suitable candidates for their use in Optoelectronic devices. HOMO and LUMO energy levels of the synthesized luminophors from electrochemical data observed in 5.50–5.64 eV and 3.09–3.13 eV with band gap 2.37–2.55 eV, respectively. TGA-DSC study revealed the thermal stability of prepared luminophors.

    关键词： Green light emitting novel luminophors,EET process,Optoelectronic devices

    更新于2025-09-04 15:30:14