46 results about "Photosystem" patented technology

Photocatalysts for reduction of carbon dioxide and water are provided that can be tuned to produce certain reaction products, including hydrogen, alcohol, aldehyde, and/or hydrocarbon products. These photocatalysts can form artificial photosystems and can be incorporated into devices that reduce carbon dioxide and water for production of various fuels. Doped wide-bandgap semiconductor nanotubes are provided along with synthesis methods. A variety of optical, electronic and magnetic dopants (substitutional and interstitial, energetically shallow and deep) are incorporated into hollow nanotubes, ranging from a few dopants to heavily-doped semiconductors. The resulting wide-bandgap nanotubes, with desired electronic (p- or n-doped), optical (ultraviolet bandgap to infrared absorption in co-doped nanotubes), and magnetic (from paramagnetic to ferromagnetic) properties, can be used in photovoltaics, display technologies, photocatalysis, and spintronic applications.

The invention relates to the field of plant antiviral genetic engineering, and provides a plant antiviral new target. On the basis of tobacco vein banding mosaic virus infection cloning, photosystem II oxygen-evolving complex protein PsbO1 is screened through immunoprecipitation and mass spectrography, and a PbsO1 gene is obtained through reverse transcription PCR amplification. Immunoprecipitation and bimolecular fluorescence complementation prove that the PsbO1 can interact with the tobacco vein banding mosaic virus 6K2. Reduction in expression of the PsbO1 gene enables an infected plant to generate resistance to the tobacco vein banding mosaic virus and potato virus Y.

The invention relates to a seed injection type surface vertical launching terahertz parameter generator comprising a laser pumping system, a seed photosystem and a nonlinear crystal, wherein pump pulsed laser generated by the laser pumping system and seed pulsed light generated by the seed photosystem pass through the nonlinear crystal at a certain included angle, and a Raman and infrared active vibration membrane of the nonlinear crystal generates stimulated exciton scattering, so that a nonlinear parameter process is generated, and a terahertz wave with the frequency of 0.6-3.0THz is obtained. The seed injection type surface vertical launching terahertz parameter generator disclosed by the invention is designed into a novel experimental apparatus, the spots of the pump light and the seed light are in any sizes under the permission of the size of the nonlinear crystal, and an optical path of the pump light reaching to the nonlinear crystal can be adjusted, so that pump light pulse and seed light pulse are synchronous in time, and furthermore, the terahertz output energy is increased.

The present invention generally relates to artificial photosystems and methods of their use, for example in artificial photosynthesis, wherein the artificial photosystems comprise one or more light-harvesting antenna (LHA) comprising a conjugated polyelectrolyte (CPE) complex (CPEC) comprising a donor CPE and an acceptor CPE, wherein the donor CPE and acceptor CPE are an electronic energy transfer (EET) donor/acceptor pair.

Photosystem II inhibitor herbicides belong to a main category in chemical herbicides, and psbA genes are target acting sites. The invention provides a specificity PCR (Polymerase Chain Reaction) primer pair (Seq ID No.1 and Seq ID No.2) for detecting the photosystem II inhibitor herbicide resistant digitaria sanguinalis and a PCR detection kit comprising the primer pair. The primer pair provided by the invention has the advantages of high specificity and high sensitivity; PCR experiments prove that (Figure 1) the psbA gene sequence of the digitaria sanguinalis can be amplified; and the amplified sequence contains reported all sites relevant to the resistance. The method has the advantages that the sensitivity and the specificity can realize the fast identification on the field suspected photosystem II inhibitor herbicide resistant digitaria sanguinalis, so that the guidance on the scientific management of resistance weeds in production practice can be realized.

The invention discloses a method for determining and evaluating cold resistance of casuarina equisetifolia and belongs to the technical field of determination and evaluation of cold resistance of tree species. The method is characterized in that: (1) new leaves of field living casuarina equisetifolia are taken as the material and refrigerated for 7-12 hours at the low temperature of minus 2-minus 15 DEG C; and (2) a chlorophyll luminoscope is standardized; a part of determined leaves which are processed are fixed and subjected to dark adaptation for 20-50 minutes; measuring light intensity and gain are adjusted to ensure the initial fluorescence F0 of the leaves which are subjected to dark adaptation to be between 200 and 500; the maximum photochemical amount Fv/Fm of a photosystem II of different parts of the leaves which are subjected to dark adaptation is measured and the measurement is repeated for three times for averaging. The method for determining and evaluating cold resistance of casuarina equisetifolia has the advantages of convenience in operation and low determining cost; and as field living casuarina equisetifolia is determined, specific analysis and evaluation can be performed according to practical condition and space. Therefore, the precision is higher and the casuarina equisetifolia can be determined and evaluated objectively.

In situ fluorescence method to monitor state of sulfur-deprived algal culture's ability to produce H₂ under sulfur depletion, comprising: a) providing sulfur-deprived algal culture; b) illuminating culture; c) measuring onset of H₂ percentage in produced gas phase at multiple times to ascertain point immediately after anerobiosis to obtain H₂ data as function of time; and d) determining any abrupt change in three in situ fluorescence parameters; i) increase in F_t (steady-state level of chlorophyll fluorescence in light adapted cells); ii) decrease in F_m, (maximal saturating light induced fluorescence level in light adapted cells); and iii) decrease in ΔF/F_m′=(F_m′−F_t)/F_m′ (calculated photochemical activity of photosystem II (PSII) signaling full reduction of plastoquinone pool between PSII and PSI, which indicates start of anaerobic conditions that induces synthesis of hydrogenase enzyme for subsequent H₂ production that signal oxidation of plastoquinone pool asmain factor to regulate H₂ under sulfur depletion.

The invention relates to the field of facility cultivation and particularly provides an external manual photosystem with a laser transmitter and a using method thereof. The photosystem is mainly formed by the laser transmitter arranged outside the wall, with small holes, of a cultivation facility, a plurality of pairs of light splitting prisms arranged in the cultivation facility, and a plurality of laser divergence devices arranged in the cultivation facility. The light splitting prisms are arranged along a light path for laser beams transmitted by the laser transmitter, and one branch of laser beams is separated from the laser beams radiated on the light splitting prism radiates to the corresponding laser beam divergence device. The laser transmitter of the manual photosystem is arranged outside the cultivation facility, laser converted into heat energy is small in proportion and is used, the influence on heat loads in the cultivation facility is small, and heat dissipation is not needed. According to the method, a large number of photons in the laser are concentrated into a tiny spatial range to be ejected, energy density is high, the laser has almost single wavelength, even if the laser is transmitted at a long distance, the characteristics of the strength and wave forms can still be kept, the utilization rate of light energy is high, and energy consumption in the plant cultivation process is greatly reduced.

An herbicidal combination including a photosystem II inhibitor, an ALS inhibitor, and a chlorophyll and heme biosynthesis inhibitor, a composition comprising the combination, and methods of using these combinations are described.

The invention discloses application of PSA3 (photosystem I assembly 3) protein in assembly of PSI (photosystem I) and maintaining of PSI stability. Claimed herein first is the application of calcium homeostasis regulator (PSA3 protein) in: assembly of photosystem I complex (PSI) (a1); formation of the photosystem I complex (PSI) (a2); maintaining of the stability of the photosystem I complex PSI) (a3). It is discovered by the inventor that under the lack of PSA3 protein, the photosystem I complex is unable to be assembled correctly so that the PSA3 protein is degraded fast; in addition, the PSA3 protein and PYG7 protein jointly assists in assembly and stabilization of the PSI complex on matrix side of PSI-assembled thylakoid membrane. The application according to the invention is of great applicable value in the study on photosynthetic eukaryotic PSI.

The invention relates to a composite material for simultaneously generating oxygen and active oxygen under near-infrared light excitation, and a preparation method and application of the composite material, and belongs to the technical field of composite materials. The technical problem that an oxygen generation manner during the tumor photodynamic therapy in the prior art cannot simultaneously realize the precise matching of oxygen and a photosensitizer both in space and time, and the PDT efficiency is greatly affected due to rapid oxygen consumption and slow spatial transmission is solved. The composite material of the invention is composed of up-conversion nanoparticles and thylakoid membranes. The invention also provides a preparation method and application of the composite material. The up-conversion nanomaterial in the composite material of the invention can convert near-infrared light (808-980 nm) into red light (-660 nm), the red light is used to excite a light system I and a light system II in the thylakoid membranes, photo-generated holes generated by the light system I are used to react with water to generate oxygen, the light systems I and II transfer energy to oxygen molecules to generate singlet oxygen, and thereby the tumor photodynamic therapy efficiency is improved.

The apparatus according to the invention has a lighting system which illuminates the sheet with pulsed excitation light. The sensor detects the light intensity emitted by the sheet during the bright phase of the pulsed excitation light and during the dark phase of the pulsed excitation light, respectively. The fluorescent and phosphorescent luminescence intensities are deduced from the intensities detected in the light and dark phases of the pulsed excitation by means of a computing device. In order to ensure the longest possible pre-irradiation with high intensity, the sensor preferably detects the luminous intensity in the area of ​​the sheet illuminated by the luminous means and towards the end of the area. In addition, the size of the illuminated area of ​​the sheeting is chosen to be many times the desired resolution.

The present disclosure provides a transgenic plant comprising one or more nucleotide sequences encoding polypeptides selected from photosystem II subunit S (PsbS), zeaxanthin epoxidase (ZEP), and violaxanthin de-epoxidase (VDE), operably linked to at least one expression control sequence. Expression vectors for making transgenic plants, and methods for increasing biomass production and/or carbon fixation and/or growth in a plant comprising increasing expression of at least one of PsbS, ZEP and VDE polypeptides are also provided.

The invention discloses an intelligent greenhouse light supplementing system which comprises a bearing reversing mechanism and a movable light supplementing mechanism, and the front end of the bearingreversing mechanism is movably connected with the movable light supplementing mechanism. According to the system, an illumination sensor is fixedly arranged at the upper end of a main lamp box, and the output end of a stepping motor is connected with a light reflecting and refracting plate through a rotating rod, so that when plants are cultivated, the indoor illumination intensity can be monitored in real time through the illumination sensor, and if the illumination intensity is sufficient, the stepping motor is started to drive the rotating rod and drive the light reflecting and refractingplate to rotate to a proper angle, and the light reflecting and refracting plate is used for refracting incident light to the plants to facilitate photosynthesis and promote growth of the plants, andat the same time, if the illumination intensity sensed by the illumination sensor is lower than a preset illumination threshold value, the main lamp box can be synchronously started, primary light supplementing lamp beads and secondary light supplementing lamp beads are used for supplementing light for indoor plants, and compared with a common light supplementing device, the intelligent greenhouselight supplementing system is more intelligent and saves more energy.

The invention relates to the technical field of greenhouse artificial light systems, and discloses an LED light source spectrum formula for tomato planting and an LED light source module. The spectrum formula comprises UV light with photon energy accounting for 1-3% of total energy, blue light with photon energy accounting for 20-26% of total energy, green light with photon energy accounting for 10-15% of total energy, red light with photon energy accounting for 48-57% of total energy and far infrared light with photon energy accounting for 8-13% of total energy According to the spectrum formula, a specific spectrum ratio in a visible light range is customized according to a special photosynthetic conversion effect on a spectrum in a specific wave band range in the growth cycle of tomatoes, and UV light in a reasonable ratio is added, so that UV light photons play roles in disinfection and sterilization, and synthesis of vitamins, proteins, sugars and acids is promoted. The content of antioxidant, the yield and quality of tomatoes and the like are improved. The added far infrared photons play roles in increasing the photon penetration rate, promoting the photon photosynthesis efficiency, generating the heat effect, and providing heat for growth and development of tomatoes, and the problem that tomatoes have poor spectral absorption and planting effects on an existing light source is solved.

The invention discloses a photosynthesis PID control method taking chlorophyll fluorescence as a feedback signal. The invention relates to a photosynthesis PID closed-loop control method using chlorophyll fluorescence as the feedback signal. Through considering limited land resources and water resources, the controlling of plant growth is important. A current greenhouse control strategy mainly depends on the experience of farmers, regardless of the actual need of the photosynthesis of plants, therefore, optimal crop yields and effective and reasonable resource utilization can not be achieved.In the invention, the main process of the photosynthesis is represented by an overall mathematical model in which the chlorophyll fluorescence (ChlF) from measurable photosystem II (PSII) is used as output. Further, through an example, experimental data is fit to determine the parameter of a model, which is the rate constant of reaction.

The present invention refers to an inventive solution that offers a significant benefit to the agricultural sector, with abroad spectrum of application, as an aid in the cultivation of all sorts of plants of agricultural interest, with a greater objective of promoting the enhancement of herbicide efficiency regarding weeds, for which purpose a composition was devised comprising a first herbicide belonging to the group whose mechanism of action acts as a photosystem II inhibitor and a second herbicide belonging to the group whose mechanism of action acts as an inhibitor of the enzyme protoporphyrinogen oxidase which together enhance their respective mechanisms of action and consequently increase their efficiency in the eradication of weeds. Furthermore, the present invention refers to the use of this composition for the preparation of a herbicide product and the method of application of said composition for combating weeds.

The present invention relates to bio-engineered photosystems, specifically photosystem II (PSII) having an alternative electron transfer pathway that enables electron flow from PSII to a water-soluble protein electron carrier. The present invention further relates to methods and systems for electron transfer using the bio-engineered photosystems. Such photosystems may be utilized for electrical energy production, hydrogen production and/or reduction of carbon-based gases (for example, CO₂ and CO) to liquid fuels.