159results about How to "Inhibition of reproductive growth" patented technology

The invention discloses a special amino acid fertilizer-water paste for aquiculture and a preparation method thereof. The special amino acid fertilizer-water paste for aquiculture is prepared from the following raw materials in certain proportion: an amino acid solution, microelements, fermentation organic substances, inorganic fertilizers, minerals, a water quality improver, beneficial bacteria and a thickening agent. The preparation method comprises the following steps: A. production of amino acid solution namely, a. hydrolyzing; b. neutralizing; c. filtering; d. concentrating; B. production of fermentation organic substances: a. mixing: evenly mixing organic raw materials with the amino acid solution; b. inoculation: evenly mixing the organic raw materials with beneficial bacteria; c. fermentation; and C. production of amino acid fertilizer-water paste: a. chelation: heating the amino acid solution, adding microelements while stirring to perform chelation; b. mixing: sequentially adding the fermentation organic substances, inorganic fertilizer, minerals, water quality improver and beneficial bacteria, and evenly mixing; c. thickening: adding a thickening agent, and evenly mixing; d. inspection. The invention enhances the immunity of fish, reduces the occurrence of diseases, increases the culture yield of bighead, lowers the fish culture cost, and improves the fish quality.

The invention discloses an efficient feed breeding method for chicken lobsters. According to the method, a paddy field having the characteristics of sufficient water source, convenience in irrigation and drainage, high water retaining capacity, drought resistance on dry weather, flooding resistance, good ecological environment, freeness from surrounding pollution source, rich soil and natural substrate structure is selected, and ctenopharyngodon idellus, aristichthys nobilis fries, river snails and the like are put into the paddy field after juvenile chicken lobsters are stocked. As proved by comparison, by adding a compound microorganism fertilizer, rapid growth of chicken lobsters can be promoted, the content of EPA (Eicosapntemacnioc Acid) is increased, and diseases of chicken lobsters are reduced, chicken lobsters died due to diseases are reduced; and meanwhile, beneficial microorganisms in water bodies are increased, and the final quality is improved.

The invention relates to a processing technique of lichee brandy, including the steps as below: fresh lichee fruits are broken, and acid is added till 6.0g to 7.0 g / l during breaking; 30 to 120 mg / l of pectase and 250 to 500 mg / l of yeast are added to the fruit juices, the operation of starting fermentation is carried out during zymohydrolysis, and the operation of maceration and zymohydrolysis is carried out for 6 to 8 hours at the temperature between 12 and 20 DEG C; the mixture obtained is led into a fermentation cylinder to be fermented for 7 to 10 days at the temperature between 14 and 20 DEG C, and the operation of fermentation is stopped when the content of residual sugar is lower than 2g / l; the operation of twice distillation is carried out, head and last flows are cut down during first simple distillation, the alcohol content of the simple distillate is regulated to the degree of 29 percent Vol; and heads, first wine, second wine, feints and aromatic water are respectively cut down according to the alcohol content during secondary fine distillation. The processing technique has the advantages of favorable zymohydrolysis effect, high rate of juice yield and effective inhabitation of bacteria growth; the lower temperature fermentation and the grading wine cutting can keep the fragrance and the taste of wine, and the processing technique is suitable for preparing the lichee brandy.

Disclosed is a method for breeding mandarin fish by utilizing microorganic feed. The method includes that: a pond is built; the pond requires a sandy bottom, about 15cm of sludge in depth, deeper than 1.5m of water, convenient irrigation and drainage, good water quality and no sewage inflow; environment requires: parent fish are selected at the most suitable growing water temperature which is 25-29 DEG C in artificial breeding application; in winter and spring, the parent fish healthy in physique and woundless in body surfaces are captured from a breeding pond and put into the pond in a greenhouse for artificial reproduction; the parent fish are put into the pond in the greenhouse for cultivation, and during daily breeding management, in the breeding period, the feed is put for 4 times every day, the amount of the feed is calculated according to 25-50% of the weight of the fish, and the feeding degree is determined according to the fact that no fish competes for food and is flexibly mastered according to weather conditions. Due to the addition of the compound microorganic feed, quick growth of the mandarin fish can be facilitated, EPA (eicosapentaenoic acid) content is increased, illness of the mandarin fish is decreased, the mandarin fish died of disease are decreased, beneficial microorganisms in water are increased, and quality and mass are increased finally.

The invention relates to feed and a preparation method thereof. Bean dregs are adopted as main raw materials, then soybean meal, sweet potato starch, wheat bran, yeast, vitality 99 ferment agent, coarse feed degrading agent, calcium hydrophosphate and the like are added into the bean dregs to be blended and mixed and be fermented through the floor heat so as to obtain the feed. The feed produced through the above method can increase the appetite of the animals, can improve the immunity of the animals and can improve the farrowing rate of sows.

Belonging to the field of microbial agents and fertilizers, the invention specifically relates to an Enteromorpha microbial agent suitable for the demands of planting, livestock and poultry, aquaculture, sewage treatment and other fields, and further discloses a preparation method of the microbial agent. The Enteromorpha microbial agent provided by the invention employs Enteromorpha to prepare a slurry, and is compounded with Streptomyces microflavus, Lactobacillus casei, bacillus subtilis, rhodopseudomonas palustris, Pichia membranaefaciens and other main beneficial microbial floras, and has the multiple functions of effectively improving agricultural product quality, effectively lowering the cost of animal and plant growth period, increasing agricultural product output and the like. The microbial agent also has the functions of purifying water, removing hydrogen sulfide and other odors from sewage, garbage and livestock raising housings, and improving the environment, etc.

The invention relates to a nutritional and safe soy milk making method of a soy milk maker, and aims at the problems that for a traditional view, water for soaking soybeans is not suitable for soy milk preparation, and dissolving-out condition of a functional component during soy milk making is almost ignored in the prior art. A main functional component soy isoflavone in soybeans plays an important role in the aspects of prevention and treatment for breast cancer and prostate cancer, improvement of climacteric syndrome and osteoporosis, protection for a cardiovascular system and the like. In order to change the misconception and obtain higher-content and high-activity isoflavone soybean milk to improve nutritive values of the soy milk, the soybeans are heated, sterilized and soaked for a long time before soy milk making, after the soybeans are soaked with the method, malignant bacteria in water can be effectively killed, and water for soaking the soybeans can be used for soy milk making; and besides, the activity of beta glucosaccharase in the soybeans can be maintained, glucosidic isoflavone hard to be absorbed by a human body is hydrolyzed into aglycone isoflavone, so that isoflavone in the soybeans are sufficiently released, and a better healthcare effect can be provided for consumers.

The invention relates to a culture method of penaeid shrimps in an over-winter shed, which comprises the following steps: building up a culture pond of the over-winter shed; discharging sea water into the culture pond after treatment, culturing water color of culture water, and then pouring shrimp fries into the culture water for culture; applying a beneficial microorganism preparation during the culture period for degrading pollutants produced during the culture process and conditioning water quality; regulating water temperature of the culture pond by opening small doors at two sides of the shed and opening a plastic thin film; and discharging sewage at the bottom of the culture pond through a central sewage discharge outlet daily and simultaneously supplementing fresh water in the late stage of culture. The culture method of the penaeid shrimps in the over-winter shed can effectively utilize the idle period of the culture pond of the penaeid shrimps in winter, realize the outdoor culture of the penaeid shrimps in winter in the South, ensure the supply of fresh and live penaeid shrimps to the market in low season of the culture and improve the production benefits and the market benefits of the culture; and the culture pond of the over-winter shed for the penaeid shrimps is simple to build up, building materials can be selected according to local material sources, and the plastic thin film and a large-mesh net coat covered on the over-winter shed can ensure that the over-winter shed can realize wind resistance and no leakage of rain.

The invention discloses eco-nutritional compound feed for laying hens at an egg-laying peak and a preparation method of the eco-nutritional compound feed. The eco-nutritional compound feed for the laying hens at the egg-laying peak comprises components in percentage by weight as follows: corn, bean pulp, rice bran, calcium hydrophosphate, rock flour, baking soda, sodium chloride, soybean oil, compound trace elements for the laying hens, compound vitamins for the laying hens, 50% choline chloride, a bacillus coagulans preparation, a fructo-oligosaccharide preparation, an DL-methionine, compound enzyme for the laying hens, phytase, montmorillonite and zeolite powder. The nutritional requirement of the laying hens can be met, the immunity and the anti-stress capacity of the laying hens can be effectively improved, the disease rate is reduced, the egg laying rate is increased, the lasting time of the peak is prolonged, the quality of eggs is improved, the environment of henhouses can be improved, and the eco-nutritional compound feed is a novel laying egg feed product integrating nutrition, the anti-disease property, promotion of a high yield and pollution-free property.

The invention discloses a microbial preparation for purifying water and improving water quality. The microbial preparation comprises a microbial nutrient solution and a water purifying agent, wherein the microbial nutrient solution is obtained by uniformly stirring 15-25 parts of molasses, 35-45 parts of glucose, 12-18 parts of sucrose, 15-25 parts of starch, 15-25 parts of chitosan, 15-25 parts of amino acid fertilizer water paste and 100-140 parts of deionized water, adding 15-25 parts of EM original liquid and fermenting for 8-12 days in an incubator; the weight ratio of the water purifying agent to the microbial nutrient solution is 1:8-1:12. According to the microbial preparation, the water can be purified, the quality of sludge at the bottom of the water is improved, the pollution of a water body is reduced, the nutrition of the water body is improved, breeding and growing of harmful germs are inhibited, the body immunity, the disease prevention and the disease resistance of aquaculture animals are improved, growth development of aquatic animals is promoted, and the yield and the quality of aquaculture organisms are improved.

The invention relates to a cultivation method for planting summer cress in a vegetable greenhouse. The cultivation method comprises the following steps of: (1) selecting high-temperature-resistant variety; (2) forcing germination of seed stems; (3) covering with a 50-70% sunshade net; (4) plowing and finishing field surface to be flat, smooth, mashed and mature; (5) spreading and arranging the seed stems; (6) covering with rice straw; (7) tapping furrow surface with a square hoe or wood board so that the seed stems and the rice straw are coated by a layer of slurry; (8) scientifically managing and controlling fertilizer and water; (9) spraying gibberellin and additionally fertilizing at roots 4-7 days before harvesting; and (10) picking in proper stage. According to the cultivation method provided by the invention, by covering with the sunshade net, cool microclimate is built; by covering with rice straw and slurry, the survival rate of the seed stems is improved; by supplying enough fertilizer, the vegetative growth of cress is promoted; and by spraying gibberellin, the summer cultivation difficulty of cress is better solved. In addition, by adopting the cultivation method provided by the invention, water and drought crop rotation in the vegetable greenhouse is realized, and a simple and efficient new way is found for preventing and controlling continuous cropping drawback.

The invention discloses a viscose fiber which has long antibacterial effect and can emit negative ions and a production method. The invention mixes tourmaline particulate that is modified by low density polyethylene wax, antioxidant and coupling agent, together with emulsion slurry that is evenly allocated with activating agent, nano-antibacterial agent (mainly nano silver) and dispersing additives, and then adds the mixture to the ordinary viscose raw liquor. The viscose fiber with long antibacterial effect and emitting of negative ions can be produced by adopting the ordinary and conventional spinning method. The fiber, which can be used for making anti-bacterial textiles or healthy textiles, is the important direction of the upgrading of daily use textiles, and can not only be used for making health care underwears and leisurewears, but also can be used for making dormitory articles such as curtains, carpets, automobile decorative cloth, bed sheets, quilts and so on.

The invention discloses a method for feeding crayfishes by nano feeds. The method comprises the following steps: putting juvenile prawns into a paddy field with the characteristics of sufficient water source, convenience in irrigation and drainage, good water retention capability, non drought in dry weather, no flooding, good ecological environment, no pollution source, fertile soil and natural substrate, and then putting grass carp summer flowers, bighead carp summer flowers, snails and the like into the paddy field. By adding a compound microorganism fertilizer, the crayfishes can be promoted to grow quickly, the EPA (eicosapentaenoic acid) content can be increased, the diseases of the crayfishes are reduced, the fatality rate is reduced, beneficial microorganisms in a water body are added, and the final quality is improved.

The invention discloses a method for scientifically and precisely breeding rice field eels. The method is characterized in that a culture pond is arranged in the east-west direction, a length-width ratio of the culture pond is 3:2, the area of the culture pond ranges from 2000m<2> to 10000m<2>, the heights of ridges of the culture pond range from 1.8m to 2.0m, the water level of the culture pond needs to be kept stable in a range from 1.4m to 1.5m for a long term, and water inlet and drainage facilities of the pond are perfect; the pond needs to be cleaned and disinfected 10-15d before rice field eel seeds are released into the pond, water in the pond is pumped completely, whether loopholes are formed in the pond or not is checked, then the pond is cleaned by the aid of quicklime, the consumption quantity of the quicklime ranges from 1125kg / hm<2> to 2250kg / hm<2> when the depth of water in the pond ranges from 7cm to 10cm, the pond is cleaned by the aid of bleaching powder if the water in the pond cannot be completely drained, new water is filled into the pond 7d after the pond is cleaned and needs to be filtered in advance, and basic fertilizers are applied after the water is filled into the pond. The water is cultivated by a process including that organic fertilizers such as chicken manure and pig manure are stacked at four corners of the pond, consumption of the organic fertilizers ranges from 2250kg / hm<2> to 3000kg / hm<2>, and the rice field eels can be bred in the pond 5-7d after the fertilizers are applied. The method has the advantages that fast growth of the rice field eels can be promoted by means of adding the compound microbial fertilizers, the EPA (eicosapentaenoic acid) content is increased, rice field eel diseases are reduced, the quantity of shrimps which die of diseases is reduced, beneficial microorganisms in the water are increased, and both the final quality and the quality are improved.

The invention discloses a preparation method of compound algicide with a high alga removal rate and belongs to the technical field of algicide. According to the preparation method disclosed by the invention, coal ash and expanded graphite are mixed to serve as a carrier, saccharose is utilized as an outer coated carbon layer precursor, and the carrier and the saccharose are prepared into visible-light catalytic active compound algicide with visible-light catalytic activity is prepared through chitosan adsorption and copper ion coating; the compound algicide is in a worm shape and has good floatability, and an the alga removal rate of the algicide is improved; under irradiation of light, alga can generate oxygen on the surface through photosynthesis, the alga is accelerated to die, a descent rate of a chlorophyll content of the alga is quickened continuously, the alga is accelerated to die, and the alga removal rate of the algicide is improved againfurther; the chitosan and the coal both have better flocculation capacity and adsorption capacity, and the chitosan can generate amino groups with positive charge after reacting with hydrochloric acid; when the amino groups are more, an acid solution and magnetite powder are utilized to jointly modify the coal ash and the expanded graphite; thus, the alga removal rate of the algicide is further improved; the algicide has a wide application prospect.

The invention discloses a planting method of salvia miltiorrhiza. The planting method comprises the steps of 1 land selecting and preparing; 2 seedling raising and transplanting, wherein root propagating, cutting propagating, seed propagating and seedling raising through plastic film mulching are performed; 3 field managing, wherein flower picking, top dressing, draining and irrigating and disease, pest and weed damage preventing and controlling are performed; 5 harvesting, wherein salvia miltiorrhiza roots are harvested and excavated when the overground parts are withered in October to early November of the next year after planting or before germination in Spring of the third year, and large-scale artificial salvia miltiorrhiza planting is achieved.

A device for processing water of river and lake and its method are disclosed. Its filtering cartridge includes four ones arranging in a circle, with pipes connecting each one adjacent and there is separating surface in the upper and middle of it, above which is the cleaned water tank with a U-typed foam exhausting pipe linking to the water feeding pipe of filtering cartridge, and the other end of the pipe is extended into the foam-exhausting tank whose lower part is linking to the dirty-exhausting exit; each water feeding pipe of filtering cartridge is linking to a support jacket pipe, and an sleeve-typed exhausting device is supported by four support jacket pipes, whose bottom is linked with a water feeding pipe and V-typed water channel placing among the inner and outer inner sleeve, there is water curtain formed on the bottom edge and two upper ones. Besides, time register can be installed on the foam-exhausting pipe for automatic washing. The machine needs no human to operate has small volume, exhausts foams water effectively, saves energy and water source, suitable for dealing with pollution of river and lake.

A process for antistaling beef while making it tender includes such steps as low-temp removing acid at 0-4 deg.C, electric stimulating, spraying composite bacterial inhibitor, natural dripdrying, vacuum packing, instantaneous scalding for 2 seconds, and low-temp storing. Its advantages are high effect, long storage time (60 days), and low cost.

The invention discloses a special compound microorganism fish fertilizer for carp and a preparation method thereof. The special compound microorganism fish fertilizer comprises the following components by weight: 2 to 4 parts of nitrogen-fixing bacteria, 1 to 3 parts of phosphate solubilizing bacteria, 3 to 5 parts of ferment bacteria, 50 to 60 parts of fish meal, 75 to 80 parts of a soybean cake, 20 to 30 parts of wheat bran, 70 to 80 parts of rice bran, 10 to 14 parts of brown sugar, 8 to 10 parts of yeast powder, 12 to 15 parts of salt, 80 to 85 parts of chicken manure, 60 to 65 parts of waterweed, 10 to 13 parts of calcium hydroxide, 15 to 20 parts of urea, 3 to 5 parts of potassium sulfate, 3 to 5 parts of ferric citrate, 0.2 to 0.4 part of vitamin B1, 0.1 to 0.3 part of vitamin B12, 1 to 4 parts of baical skullcap root, 3 to 5 parts of isatis root and 4 to 6 parts of liquorice. The compound microorganism fish fertilizer provided by the invention can promote rapid growth of fish, improve quality and quantity of fish, reduce fish diseases and allows beneficial microorganisms in water to be increased and growth of algae in a fishpond to be retarded.

The invention relates to a Chinese herbal medicine compound micro-ecology preparation and a preparation method thereof, and a use in the aquaculture. The micro-ecology preparation is mainly prepared by Chinese herbal medicine extracting solution, a fermentation medium, and compound bacteria solution through the fermentation. The Chinese herbal medicine extracting solution is mainly extracted from 30-35% of astragalus membranaceus, 10-15% of folium artemisiae argyi, 15-20% of semen cassia, 15-20% of Angelica sinensis, and 10-15% of eucommia ulmoides. The compound bacteria solution is prepared by fermenting and mixing lactobacillus, Bacillus subtillis, saccharomycetes and photosynthetic bacteria. The Chinese herbal medicine compound micro-ecology preparation is capable of purifying water quality and improving aquatic livestock immunity in the aquaculture process, rapidly reducing the hazardous substance in the water body, improving the water quality, inhibiting the breeding and growth of pathogenic microorganism, stimulating the own immunity and anti-stress capacity of the aquatic livestock, reducing the occurrence of diseases, improving the survival rate of the aquatic livestock, reducing the death rate, and improving the utilization rate and the conversation rate of feed.

The invention relates to solid microorganism purification particles and a preparation method thereof. The solid microorganism purification particles are prepared from a plant adsorbent, a microbial agent and an adhesive, wherein the plant adsorbent is prepared from modified tealeaf residues and / or modified herb residues; and the microbial agent is prepared from EM bacteria. The solid microorganismpurification particles provided by the invention can purify multi-pollution source water bodies, treats sludge and improves the comprehensive water pollution treatment effect without secondary pollution; as being mainly formed by decomposable substances self, the solid microorganism purification particles have small influence on the solid content of each water body; and the solid microorganism purification particles can also increase the nutrition of the water bodies, inhibit reproduction and growth of harmful germs, strengthens health growth of water body animals, increases the yield of cultivated objects in the cultivation water bodies and improves the quality of the cultivated objects in the cultivation water bodies.

The invention discloses lactobacillus rhamnosus, a fermentation lysate for regulating skin micro-ecology and a preparation method of the lactobacillus rhamnosus and the fermentation lysate. The lactobacillus rhamnosus 11-7 disclosed by the invention is preserved in the China Centre for Type Culture Collection, and the preservation number of the lactobacillus rhamnosus 11-7 is CCTCC NO:M2021185. The invention provides a fermentation lysate, which comprises the following components in percentage by mass: 0.2-1% of protein, 0.3-0.8% of polysaccharide and 0.2-1% of amino acid. The fermentation lysate obtained by fermenting the strain in the invention can strongly inhibit reproduction and growth of pathogenic bacteria, has a promoting effect on part of probiotics, and particularly has a strong inhibiting effect on candida albicans pathogenic form hyphae; and furthermore, the fermentation lysate can generate antibacterial peptide in the fermentation process, also up-regulates the expression quantity of skin cell antibacterial peptides in the gene level and the protein level, improves the skin immunity, and can significantly regulate the skin micro-ecological environment as a cosmetic raw material.

The invention discloses an integrated high-efficiency deodorizer which comprises a stock solution tank, a solution storage tank, a spraying system, an electrical control system and a tank body; the electrical control system is electrically connected with the stock solution tank, the solution storage tank, a metering pump and the spraying system; the spraying system comprises a high-pressure atomization pump, a control valve, a high-pressure water pipe and a spray nozzle; the stock solution tank, the metering pump, the solution storage tank, the electrical control system, a filter and the high-pressure atomization pump and the control valve of the spraying system are all integrated in the tank body; the electrical control system, the solution storage tank, the stock solution tank and the spraying system are arranged in the tank body from top to bottom; the electrical control system is a microcomputer automatic program control system; furthermore, the improvement lies in that the integrated high-efficiency deodorizer further comprises an induction device; the induction device comprises a concentration sensor which is connected with the electrical control system; the electrical control system consists of a control panel and a programmable controller. The integrated high-efficiency deodorize is compact in structure, is high in intelligentization degree, is simple, convenient and quick to operate, is high in working efficiency and has good deodorization effect.

The invention discloses a method for breeding finless eel by nano feeds. The method comprises the following steps: selecting a pond which is in east and west directions, has a length-to-width ratio of 3 to 2, an area of 2000-10000m<2>, a pond ridge height of 1.8-2.0m and a stable water level of 1.4-1.5m, and is provided with perfect water drainage facilities as a breeding pond; disinfecting the pond in 10-15 days before finless eel fries are put into the pond, draining off water in the pond, checking whether holes are formed, cleaning the pond by unslaked lime, and feeding the finless eel fries with multifunctional microorganism feeds. Through comparison, and by adding a compound microorganism fertilizer, the finless eel can be promoted to grow quickly, the EPA (eicosapentaenoic acid) content can be increased, the finless eel diseases are reduced, the fatality rate is reduced, meanwhile beneficial microorganisms in a water body are added, and the final quality is improved.

The invention discloses a composition containing a herbal extract and a makeup material composition. The composition containing the herbal extract comprises 5-20% of a guava leaf extract, 5-20% of an angelica sinensis whole grass extract, 5-35% of a tea extract and a lotus leaf extract by mass, totaling 100%. The makeup material composition is the composition containing the herbal extract. The composition which contains mixed extracts such as the lotus leaf extract, the tea extract, the guava leaf extract and the angelica sinensis whole grass extract can inhibit reproductive growth of propionibacterium acnes which causes acnes of skins and inflammatory response, has a very good improving effect on skin problem, promotes blood circulation of the skins and maintains lubricative and clean skins, and is free of irritation and side effects and high in safety when being used.

Animal feed additive comprises, by weight, 10-15 parts of curcumin powder, 15-20 parts of tea powder, 8-19 parts of garlic powder, 2-3 parts of probiotic powder, 30-40 parts of corn grit and 60-70 parts of sweet potato powder. Preparation steps include filtering, weighing, mixed fermentation, granulation and drying. The animal feed additive is applied to pig feed, and the adding quantity of the additive is 0.3%-0.5% of the pig feed. The additive is prepared from nontoxic and harmless production raw materials, has the functions of resisting oxidization, killing germs and regulating intestinal flora, effectively enhances the immunity of animals, decreases diseases and improves animal meat quality.

Disclosed is a method for breeding finless eel by utilizing multifunctional compound feed. A culture pond trends eastwards to westwards, is 3:2 in the ratio of length to width, 2000-10000 square meters in area and 1.8-2.0m in pond bank height, has a water level stabilized at 1.4-1.5m for a long time, and is a pond with complete water inflow and water drainage facilities; 10-15 days before the finless eel is put into the pond, the pond is sterilized, water in the pond is pumped out, loopholes are detected, the pond is cleaned with quick lime, and the finless eel is fed with the multifunctional compound feed. Discovered by comparison, by the aid of the multifunctional compound microorganic feed, quick growth of the finless eel can be facilitated, EPA (eicosapentaenoic acid) content is increased, illness of the finless eel is decreased, shrimps died of disease are decreased, beneficial microorganisms in the water are increased, and quality and mass are increased finally.

The invention discloses a gas leakage detecting agent for an airplane, which is composed of the following materials in parts by weight: 0.2-20 parts of a surfactant, 0.1-2 parts of an anticorrosive agent, 0.1-2 parts of a bactericidal inhibitor and 76-99.6 parts of a solvent. The gas leakage detecting agent does not contain oil, silicon or other harmful solvents, and can position a gas leakage part of an airplane tire, an airplane high-pressure oxygen system, an airplane low-pressure oxygen system and other oxygen supply systems quickly and reliably. In addition, the gas leakage detecting agent does not damage airplane materials, has no residue after usage and has no harm to the human body.

The invention discloses a natural compound shown in the formula I or pharmaceutically acceptable salts thereof and a preparation method and application thereof. The compound has the activity of inhibiting reproductive growth of tumor cells and can be used for preparing drugs for inhibiting proliferation of tumor cells of eukaryotes or used for preparing drugs for preventing and / or treating tumors. The Formula I is shown in the specification.