100 results about "Growth velocity" patented technology

The invention provides a neoprene composite which can improve the cold tolerance performance of a brake of railway locomotive and rolling stock, using neoprene with slow crystalline growth velocity as the main material matched with other added rubbers and accessory ingredients that can disturb the crystallization of neoprene, reduce the brittleness temperature and improve the cold tolerance performance thereof. Calculated by weight, the components comprise 100 to 50 portions of neoprene, 4 to 15 portions of vulcanizator, 0.5 to 4 portions of processing material, 10 to 90 portions of reinforcing filler, 15 to 50 portions of compound plasticizer, 0.5 to 6 portions of curing catalyst and 3 to 9 portions of aging inhibitor. The neoprene composite with improved cold tolerance performance overcomes the disadvantages of low temperature crystallization and poor cold tolerance of the common neoprene, is suitable for operation environment of railway locomotive and rolling stock in our country, and can meet use requirements within the temperature scope of minus 50 DEG C to 70 DEG C.

The present invention relates to an active peptide feed addictive, as a mixture of one or more plant protein and animal protein, which is the product of the following steps: fermenting and degrading the mixture through bacillus and the like, controlling the degree of hydrolysis at 20-35%, obtaining a fermentation supernatant after a separation post-processing process, concentrating drying the supernatant or directly adsorbing the supernatant onto the carrier, and then low temperature drying it. Said active peptide feed addictive is capable of obviously depressing development of bacillus coli and salmonella, and can prevention and cure diarrhea caused by bacilli or lienteric diarrhea; can exert its functions at a very low concentration, with a very intense effect; can regulate stomach and intestine bacterium group and promote animals digestion functions; can excite animal immune function, reinforce animal disease resistance against a plurality of epidemic diseases and greatly reduce the morbidity and death rate; can promote animal development and improve the growth velocity; can improve the feed use ratio and reduce production costs. Applications of the microorganism fermentation degradation method provided by the present invention have a low fabricating cost, and the obtained peptides have many kinds and high content, without environment pollutions.

The present invention relates to a process for preparing a single crystal silicon ingot, as well as to the ingot or wafer resulting therefrom. The process comprises controlling (i) a growth velocity, v, (ii) an average axial temperature gradient, G0, and (iii) a cooling rate of the crystal from solidification to about 750° C., in order to cause the formation of a segment having a first axially symmetric region extending radially inward from the lateral surface of the ingot wherein silicon self-interstitials are the predominant intrinsic point defect, and a second axially symmetric region extending radially inward from the first and toward the central axis of the ingot. The process is characterized in that v, G0 and the cooling rate are controlled to prevent the formation of agglomerated intrinsic point defects in the first region, while the cooling rate is further controlled to limit the formation of oxidation induced stacking faults in a wafer derived from this segment, upon subjecting the wafer to an oxidation treatment otherwise suitable for the formation of such faults.

The invention relates to a preparation method of nano-sized magnesium hydroxide, which is characterized in that a soluble magnesium salt solution and soluble lye which are added with a dispersant react in a reactor which is put in an ultrasonic tank and provided with a stirrer to obtain magnesium hydrate suspension; the magnesium hydrate suspension is processed through ultrasonic ageing at room temperature; the magnesium hydrate which is processed through ageing is dried through heating to obtain nano-sized magnesium hydroxide powders after being filtered and washed. The ultrasonic wave which is exerted during the reaction process promotes the nucleation, inhibits crystal nucleus growth velocity, and controls the size and the distribution of particles; the ultrasonic cavitation avoids the occurrence of aggregate phenomenon, and increases the uniformity and the dispersibility of nano particles; the thermal effect of the ultrasonic wave increases the crystallinity degree of the nano particles and shortens the ageing time of samples. Therefore, the preparation method has the advantages of simple technology, short production period, mild production conditions, good product dispersibility, and even particle distribution.

The invention relates to process for preparing sliver-nanometer anti-bacteria material. The process comprises that an aluminum ion membrane is prepared on the surface of a substrate which is subsequently soaked into silver mirror reaction liquid, and then the substrate is taken out. The scheme employs that the aluminum ion membrane is prepared on the surface of the substrate, which enables the substrate to be covered with aluminum ion, and silver mirror reaction liquid is employed to produce aluminum hydroxide in ammoniated silver solution, which changes the growth velocity of different crystal surfaces of the silver, thereby inducing the growing of flaky silver nanometer slice structure, accomplishing the preparation of silver nanometer slice in a short time, and simplifying the industrial art. As the longer nanometer slice has growth vantage, the achieved nanometer slice structure is enabled to be preserved, thereby guaranteeing the regulation of the silver nanometer structure in silver nanometer anti-bacteria materials.

The invention relates to a pre-filming MAP filler which can improve the crystallization sedimentation performance of MAP (struvite) and a preparation method. The pre-filming MAP filler and the preparation method are characterized in that porous particles such as waste zeolite, waste active carbon, coke, fly ashes, etc. are used as carriers, magnesium, phosphate and ammonia-nitrogen are used as raw materials, the mol ratio among N, P and Mg is 1:1:1.0 to 2.0, and an MAP film is formed on the surface of the carriers through fluidized reaction. The filler is put in ammonia-containing phosphorus wastewater, so the crystallization sedimentation performance of the MAP (struvite) on the surface of the pre-filming filler can be enhanced obviously; the test shows that the crystal nucleus growth velocity is increased about 20 percent compared with a common amorphous filler carriers. In addition, the carriers are pre-filmed, thereby being beneficial for the MAP film-forming and increasing the firmness of the film. The pre-filming MAP filler and the preparation method adopt external circulation fluidized reaction to prepare the pre-film, and the friction between the carriers is reduced, thereby being also beneficial for the film-forming on the carriers. Air is added before reaction for pressurizing, thereby being beneficial for the formation of the porous pre-filmed MAP carriers and increasing the porosity of the pre-filmed carriers obviously.

The invention relates to an organic water soluble fertilizer containing alginic acid. The organic water soluble fertilizer comprises the following components in parts by weight: 40-50 parts of alginic acid, 15-25 parts of humic acid, 10-20 parts of compound amino acid, 3-5 parts of vitamins and microelement mixture, 3-5 parts of urea, 5-8 parts of P2O5, 5-8 parts of K2O and 300-500 parts of water. Active components such as alginic acid are added into the water soluble fertilizer, and the components such as amino acid and vitamins are also added into the water soluble fertilizer. By using the fertilizer, the growth velocity of crops can be effectively promoted, and the balance nutrition of the crops is maintained; and in addition, the plant diseases and insect pests of the leaf areas can be reduced when a Chinese herb medicine water extract having an insecticidal efficacy added into the fertilizer is sprayed to the leaves. The vitamins and the microelement mixture of the water soluble fertilizer use seaweed grinding fluid, so that the seaweed resources are fully utilized, and the balanced proportion requirement of the vitamins and the microelements in the fertilizer can be guaranteed.

The invention relates to the biological engineering field, in particular to a culture medium and a preparation method thereof. The Pleurotus eryngii liquid strain culture medium comprises raw materials and an aqueous solution. The raw materials comprise the following components by weight percent: 1.5%-2.5% of white granulated sugar, 0.1%-0.3% of soybean meal powder, 0.1%-0.3% of yeast extract, 0.05%-0.1% of potassium dihydrogen phosphate and 0.05%-0.1% of magnesium sulfate. The preparation method of the Pleurotus eryngii liquid strain culture medium comprises the following steps: preparing a culture medium, adjusting, sterilizing and performing inoculation and culture. By adopting the technical scheme, after the product is used as the culture medium of the Pleurotus eryngii liquid strain, the Pleurotus eryngii mycelium has high growth velocity, strong vitality and high mycelium content; and the inoculated strain has high germination rate, short fermentation period and high yield.

The invention discloses a high-temperature high-strength TiAl-Nb monocrystal and a preparation method thereof. Based on the atomic percent, the high-temperature high-strength TiAl-Nb monocrystal comprises the alloy components: Ti-(43-47) Al-(6-10)Nb-(0.1-1)(C, Si), and the balance of Ti. The preparation method comprises the following steps: smelting TiAl-Nb button-shaped master alloy ingot casting by using an electro-magnetic induction suspension method; preparing a cylindrical rod-shaped sample by means of differential pressure suction casting or gravity casting; directionally condensing the cylindrical bar by using an optical float-zone crystal growth system to guarantee that the heating power is between 65% and 70%, the growth velocity is 5-30mm / h, the relative rotation speed is 20-40r / min and the argon flow protection is carried out for 3-5L / min; finally obtaining a TiAl-Nb monocrystal test bar; and performing desegregation heat treatment on the TiAl-Nb monocrystal bar to finally obtain the monocrystal test sample. By adopting the TiAl-Nb monocrystal alloy material prepared by using preparation method disclosed by the invention, the alloy pollution caused by a traditional Bridgman directional condensation method can be effectively avoided, a solid-liquid interface shape during condensation is controlled by regulating the heating power so as to quickly obtain the TiAl-Nb monocrystal, and after the desegregation of the TiAl-Nb monocrystal, the high-strength TiAl-Nb monocrystal alloy of which the yield strength is 637MPa at a temperature of 900 DEG C, the elongation percentage is 8.1% and the ductile-brittle transition temperature is not lower than 900 DEG C can be obtained.

The invention relates to a water soluble fertilizer containing alginic acid and fishbone dust. The water soluble fertilizer comprises the following components in parts by mass: 40-50 parts of alginic acid, 15-25 parts of humic acid, 10-20 parts of fishbone dust, 3-5 parts of vitamin and microelement mixtures, 3-5 parts of urea, 5-8 parts of K2O and 300-500 parts of water. The fertilizer provided by the invention can be used for effectively promoting the growth velocity of plants and keeping the nutrient balance of the plants. In addition, as aqueous extract with insecticidal efficacy of traditional Chinese medicines is added into the fertilizer, when the fertilizer is sprayed and applied to leaf surfaces of the plants, plant diseases and insect pests to the leaf surfaces can be reduced effectively. Meanwhile, as crushed seaweed liquid is taken as the vitamin and microelement mixture, seaweed resources are fully utilized, and the requirement on balanced proportioning of vitamins and microelements in the fertilizer can be met.

In a method for producing a high quality silicon single crystal by the Czochralski method, a lower portion of a solid-liquid interface of a single crystal growth is divided into a central part and a circumferential part, and the temperature gradient of the central part and the temperature gradient of the circumferential part are separately controlled. When a silicon melt located at a lower portion of a solid-liquid interface of a single crystal growth is divided into a central part melt and a circumferential part melt, the method controls the temperature gradient of the central part melt by directly controlling the temperature distribution of a melt and indirectly controls the temperature gradient of the circumferential part melt by controlling the temperature gradient of the single crystal, thereby effectively controlling the overall temperature distribution of the melt, thus producing a high quality single crystal ingot free of defects with a high growth velocity.

The invention relates to a method for a robot to avoid a dynamic obstacle in a complex occasion. According to the method, under the conditions that the robot is provided with a limited sensing range and the velocity of the dynamic obstacle is greater than the velocity of the robot, an effective track can be generated; and meanwhile, under the condition that the velocity of the dynamic obstacle cannot change suddenly, the track generated by the method can still avoid the obstacle, and a new route does not need to be calculated repeatedly. The method generates a random tree based on a rapid random tree method to search a feasible route, in the growth process of the rapid random tree, growth and selection of tree nodes are carried out by a method of velocity obstruction (MVO), an obstacle avoiding problem can be synchronously considered in a velocity field and a position field, the velocity obstruction growth velocity is high, and high efficiency is achieved; meanwhile, the MVO considering maximum robot velocity is adopted, the comparatively high-velocity dynamic obstacle can be avoided; and in addition, the velocity obstacle has advantage in multi-robot avoiding condition, and the method for robot to avoid the dynamic obstacle in the complex occasion is suitable for avoiding multi-dynamic-obstacles.

The invention discloses an edible fungus culture medium using dragon fruit peel as a raw material, the edible fungus culture medium includes a dry material and water, the dragon fruit peel accounts for 40% ~ 80% of the dry material weight, and the weight ratio of dry material to water is 1:0.5 to 0.8. The dry material also includes 10wt% ~ 50wt% of wood chip, 8wt% ~ 10wt% of rice bran and 0.8wt% ~ 1.2wt% of calcium carbonate. The culture medium can make full use of agricultural waste to achieve turning waste into treasure, edible fungus cultured by use of the culture medium has good growth velocity and biotransformation efficiency, and the edible fungus culture medium can replace traditional edible fungus culture mediums.

The invention provides a dynamic membrane forming control method applicable to anaerobic digestion of excess sludge, and relates to a continuous dynamic membrane filtering mode of a split immersion type anaerobic dynamic membrane-biological reactor for treating excess sludge. According to the dynamic membrane control method disclosed by the invention, an intermittent operation mode of biogas circulation is set and a purpose of controlling the growth and decay rate of the dynamic membrane by setting the closing and opening time of the biogas circulation and biogas circulation strength is achieved. The dynamic membrane forming control method disclosed by the invention is coupled with conventional anaerobic fermentation and a novel dynamic membrane separating process, so that not only can anaerobic conditions of a main body reaction region be ensured while a dynamic membrane assembly is cleaned, but also upgrading and reconstruction of the conventional anaerobic fermentation tank are convenient; the intermittent operation mode of biogas circulation can be used for restraining growth velocity of the dynamic membrane and reducing damages of gas scouring on the dynamic membrane, so that not only is water quality of outlet water improved, but also physical cleaning period is prolonged. Compared with the conventional biogas circulation mode, effect of saving energy is achieved by greatly reducing opening time of the circulation mode, so that gas circulation energy consumption can be saved by 67%-97% under the same aeration intensity condition.

The present invention relates to isolated nucleic acid molecules and their corresponding encoded polypeptides able confer the trait of modulated plant size, vegetative growth, organ number, plant architecture, growth rate, seedling vigor and / or biomass in plants. The present invention further relates to the use of these nucleic acid molecules and polypeptides in making transgenic plants, plant cells, plant materials or seeds of a plant having plant size, vegetative growth, organ number, plant architecture, growth rate, seedling vigor and / or biomass that are altered with respect to wild type plants grown under similar conditions.

In a method for producing a high quality silicon single crystal by the Czochralski method, a lower portion of a solid-liquid interface of a single crystal growth is divided into a central part and a circumferential part, and the temperature gradient of the central part and the temperature gradient of the circumferential part are separately controlled. When a silicon melt located at a lower portion of a solid-liquid interface of a single crystal growth is divided into a central part melt and a circumferential part melt, the method controls the temperature gradient of the central part melt by directly controlling the temperature distribution of a melt and indirectly controls the temperature gradient of the circumferential part melt by controlling the temperature gradient of the single crystal, thereby effectively controlling the overall temperature distribution of the melt, thus producing a high quality single crystal ingot free of defects with a high growth velocity.

The present invention relates to isolated nucleic acid molecules and their corresponding encoded polypeptides able confer the trait of modulated plant size, vegetative growth, organ number, plant architecture, growth rate, seedling vigor, growth rate, fruit and seed yield, tillering and / or biomass in plants. The present invention further relates to the use of these nucleic acid molecules and polypeptides in making transgenic plants, plant cells, plant materials or seeds of a plant having plant size, vegetative growth, organ number, plant architecture, growth rate, seedling vigor and / or biomass that are altered with respect to wild type plants grown under similar conditions.

The invention discloses a crop-stem-diameter growth velocity predicting method based on the physiological effect. The crop-stem-diameter growth velocity predicting method includes the steps that as the relationships between the crop-stem-diameter growth velocity and air temperature and illumination intensity are researched, a crop-stem-diameter growth velocity predicting model based on the physiological effect is built with a linear regression method, and the crop-stem-diameter growth velocity is accurately predicted. By means of the crop-stem-diameter growth velocity predicting method, the growth condition of crops can be learnt in time, the growth and development stage of crops can be more accurately judged, a theoretical foundation and decision supporting are provided for reasonably arranging facility agricultural production and management, and the crop-stem-diameter growth velocity predicting method can be used for modern facility agriculture environment control.

The invention discloses an artificial multiplication method of schizothorax prenati. The method comprises the four steps of selecting and culturing parent fishes, artificial induced spawning, artificial inseminating and incubating. The method is low in cost, high in induced spawning efficiency, high in survival rate and fast in growth; specific oxytocic is adopted to be injected, so that the induced spawning efficiency is greatly improved; and meanwhile, an artificial compound feed containing a specific formula content is adopted to feed the schizothorax prenati, so that the growth velocity is greatly improved, meanwhile, the immunity and the resistance of the schizothorax are effectively improved, the survival rate is greatly improved, and the artificial multiplication method of the schizothorax prenati is a very effective multiplication method.

The invention discloses a device for producing an optical-fiber prefabricated member, which belongs to the technology of producing optical fiber. The prior device can not timely response to the changes of temperature, waste discharge velocity, material feeding velocity and the like to control the internal pressure of a reaction container in a stable state. The device for producing an optical-fiber prefabricated member is provided with a reaction container for gas-phase axial deposition, and the reaction container comprises a waste discharge pipeline. The device for producing an optical-fiber prefabricated member is characterized in that the waste discharge pipeline is connected with a main waste discharge pipeline by an automatic pressure regulation valve for supplying air, a pressure gauge and an automatic pressure regulator for a manual pressure regulation valve for supplying air, and the main waste discharge pipeline is connected with a waste discharge system. The invention can reduce the phenomenon of the uneven temperature distribution caused by the vibration of oxyhydrogen flames during reaction, prevents the conditions of uneven densities of loose media, changed growth velocity and unstable axial performance, reduces the phenomenon of disordered air currents in the reaction container and enables fine granules which are not deposited on the surfaces of the loose media to be discharged out from the reaction container in time.

The invention discloses a growth method of a low-stress aluminum nitride crystal. According to the growth method, rapid two-dimensional mode growth of an AIN (Aluminum Nitride) crystal is achieved ina temperature and pressure variable mode, the stress of a single aluminum nitride crystal is reduced, and the single aluminum nitride crystal which has no crack on a growth surface and has naturally grown steps is grown. According to the growth method, a temperature control process and a mode that the temperate and the pressure of a specific temperature interval are varied in the growth process are adopted, the atom nucleation rate is reduced because of high pressure and low temperatures at a former stage, the primary nucleation tidiness is improved, and substrate decomposition failure is inhibited; at a middle growth stage, the pressure is reduced, so that the growth velocity is increased, and substrate decomposition is retarded; at a later stage, the temperature and the pressure are increased, nitrogen source supply is increased, a three-dimension island growth mode is avoided, the phenomena of non-uniform deposition and relatively large stress are reduced, secondary temperature increasing is implemented after cooling, the stress inside the crystal is reduced, cracks on the surface of the crystal is healed, a silicon carbide substrate is decomposed, and thus a self-striped high-quality single aluminum nitride crystal is grown.

The invention relates to a gas hydrate method sewage treatment system belonging to the field of environmental science and engineering. The gas hydrate method sewage treatment system comprises two levels of treatment facilities and comprises a first-level treatment water mixture-sewage transportation unit, a first-level treatment hydrate generation decomposing unit, a secondary-level treatment water mixture-sewage transportation unit and a secondary-level hydrate generation decomposing unit. Hydrate decomposition water after first-level treatment is used as a raw material of secondary-level treatment, and pollutant removal efficiency is improved through two-level treatment. The gas hydrate method sewage treatment system is suitable for large-scale treatment of domestic wastewater and industrial wastewater, inorganic pollutant and organic pollutant can be effectively removed simultaneously, operating cost is reduced due to cyclic utilization of water mixture, heat and mass transfer of hydrate generation process is strengthened due to arrangement of a spray device and a stirrer, and the hydrate growth velocity is increased. The system and the method are reasonable and compact in structure, industrial production requirement is met, operation process is stable and reliable, cost is low, energy is saved and environment is protected.

The invention discloses a cultural method of American ginseng adventitious root tissue. The cultural method disclosed by the invention comprises the following steps: (1) inducing American ginseng callus; (2) secondarily culturing the American ginseng callus; (3) inducing the American ginseng adventitious root; (4) secondarily culturing the American ginseng adventitious root; and (5) culturing a reactor of the American ginseng adventitious root. According to the method disclosed by the invention, the growth velocity is much faster than the primary root. The root can be proliferated by 21.76 fold after culturing for a culture cycle; the productivity of the active secondary metabolite is high and stable; and meanwhile, the cultures are uniform and not affected by the natural environment such as natural disaster and the like. The cultural method of American ginseng adventitious root tissue disclosed by the invention has the characteristics of simple technical process, low cost, high inductivity, good repeatability and fast proliferation of the adventitious root.

The invention provides a method for reproducing baby rabbits in burrows. The burrow is provided with an entrance, an exit, a reproduction cavity and cover and a born rabbit tray, which is fabricated in situ or prefabricated, and is placed underground, semi-underground or on the ground at one side of a cage. The female rabbits give birth in the reproduction cavity and the baby rabbits grow and develop in the reproduction cavity. The burrows adopted in the method can simulate the ecological environment of the natural caves so as to be warm in winter and cool in summer and have appropriate humidity, are convenient for repetitive fabricating and factory production, are convenient for cleaning, washing and sterilizing, overcome artificial interference, can improve growth and development as well as growth velocity and health level of the baby rabbits and reduce occurrence of diseases. The female rabbits can give birth for multiple times in the burrows in a year, thus increasing the reproductive output. The method of the invention is suitable for rabbit breeding and reproduction.

The invention discloses a method for increasing the yield of pullulan. The method comprises the following steps: after activating aureobasidium pullulans, inoculating a seed medium; after OD600 is greater than 0.3, inoculating seeds into a fermentation medium; monitoring OD600 of a fermentation liquid in real time; when OD600 is greater than 0.2 and less than 0.3, adding a compounding agent I which accounts for 0.02-0.03% of the volume of the fermentation liquid, so as to greatly increase the bacterium growth velocity and remarkably shorten the logarithmic growth phase; when OD600 is greater than or equal to 0.6, adding a compounding agent II which accounts for 0.03-0.05% of the volume of the fermentation liquid. The substrate conversion speed can be accelerated, the polysaccharide synthesis performance can be improved, and the yield can be greatly increased.

The invention relates to a model method for calculating the fixed carbon content of ocean ultra-miniature phytoplankton. The method comprises the following steps: respectively testing abundance of synechococcus and ultra-miniature eukaryotic algae in an acquired sample; respectively calculating the carbon biomass and growth velocity of the synechococcus and the ultra-miniature eukaryotic algae so as to obtain the euphotic layer depth of sampling points of the synechococcus and the ultra-miniature eukaryotic algae; respectively calculating responses of the synechococcus and the ultra-miniature eukaryotic algae to surface light intensity on the basis of water depth variation; respectively calculating primary productivity of the synechococcus and the ultra-miniature eukaryotic algae so as to obtain primary productivity of ultra-miniature phytoplankton at the sampling points. By adopting the method, the fixed carbon content of ultra-miniature phytoplankton in offshore, shelf sea and high-latitude open ocean (the latitude of which is greater than 40 degrees) can be calculated, compared with a method for determining the primary productivity of ultra-miniature phytoplankton on the basis of 14C in situ, the method saves time and labor, and can be used for estimating the primary conductivity of ultra-miniature phytoplankton in a relatively large research area. Tests show that the primary conductivity calculated by using the method has relatively good linear relationship with that of ultra-miniature phytoplankton tested on the basis of 14C, good estimation reliability is achieved, and a theoretic basis is provided for later practical study.

The present invention relates to a process for growing a single crystal silicon. The process including controlling a growth velocity, v, and an average axial temperature gradient, G0, during the growth of the constant diameter portion of the crystal over the temperature range from solidification to a temperature of no less than about 1325° C., to cause the formation of a first axially symmetrical region in which vacancies, upon cooling of the ingot from the solidification temperature, are the predominant intrinsic point defect and which is substantially free of agglomerated intrinsic point defects, wherein the first axially symmetric region has a width of at least about 50% of the radius of the constant diameter portion of the ingot.

The invention relates to a vitreoscilla hemoglobin vgbS nucleotide sequence and a plasmid and a preparation method thereof, and belongs to the technical field of biological engineering. The vitreoscilla hemoglobin vgbS nucleotide sequence is prepared by introducing restriction enzyme cutting sites of NdeI and EcoRI at both ends of a vgb nucleotide sequence of streptomyces serving as a host cell respectively. In addition, the plasmid pJTU4406 is generated by cutting off the vgbS nucleotide sequence on pJTU4405 through the NdeI and the EcoRI, and inserting the vgbS nucleotide sequence into corresponding sites of a carrier pIB139. An amino acid sequence of protein expressed and generated by the vgbS nucleotide sequence is totally identical to that of the natural vitreoscilla hemoglobin, and the vitreoscilla hemoglobin vgbS nucleotide sequence can improve the utilization efficiency of the streptomyces to oxygen, promote the growth velocity of thalli and improve the yield of antibiotics.

The invention relates to the field of marine microalgae, in particular to a heterotrophic culture medium used for large-scale cultivation of marine microalgae. The culture medium is prepared from 0.5-1.5 g of nitrate, 2-10 mg of monopotassium phosphate, 2-10 mg of dipotassium phosphate, 0.1-1 mg of ferric citrate, 0.5-2 mg of magnesium sulfate heptahydrate, 0.5-2 mg of calcium chloride dehydrate, 5-20 g of an organic carbon source and 1000 mL of filtered seawater. The nitrate is potassium nitrate or sodium nitrate, and the organic carbon source is glucose or sucrose. The heterotrophic culture medium is widely used for the large-scale cultivation of the marine microalgae, can increase growth velocity of the marine microalgae, shorten the growth cycle of the marine microalgae, increase the biological yield of the marine microalgae, meanwhile sharply reduce the cost of the culture medium, and is an ideal culture medium used for the large-scale cultivation.

The invention discloses a low fat chicken raising method, which comprises controlling growth velocity, and controlling lipogenesis through shortening feed time, wherein only plant fodder formulation is employed, and animal fat and feed stuff are strictly prohibited. By adopting different fodder formulation based on the physiological requirements of various growth phases of the chickens, the lipogenesis can be regulated and controlled.