73results about How to "Good restorative" patented technology

The invention relates to a eutectic microcapsule wrapping technology and application thereof in cosmetics, and belongs to the technical field of cosmetic production. The wall material of the eutectic microcapsule inclusion comprises at least one of hydrogenated lecithin, caprylic / capric triglyceride, sucrose stearate, PEG-8 caprylic / capric glycerides, PEG-40 hydrogenated castor oil, soya bean lecithin, cyclodextrin, ethyl palmitate and troxerutin. The core material is prepared from at least one of salicylic acid, 4-butylresorcinol, glabridin, a kava extract, cortex magnoliae officinalis total phenols, ginseng oil, ganoderma lucidum spore oil, astaxanthin, coenzyme Q-10, a rosemary extract, ceramide and vitamin E. According to the invention, multiple eutectic coating can be formed, the consumption of the wall material can be reduced, the cost is saved, the wall material and the core material are matched for use, so that the excellent effects of permeation, oxidation resistance, soothing, allergy resistance and skin repair can be achieved, and the utilization rate of active substances is increased.

The invention provides a device and a method for polishing and repairing a blisk of an aero-engine by using composite laser aiming at the common problems of cracks and surface roughness in the machining process of the blisk of the aero-engine, and the device comprises a five-axis moving platform system, a 1064nm infrared laser generator system and an optical ranging system; according to the method, a six-axis composite laser polishing and repairing device is utilized, a high-precision multi-wavelength and multi-frequency-band laser scanning device is carried, continuous polishing and repairing serve as a main body, and a five-axis moving platform system, a 1064nm infrared laser generator system, an optical distance measuring device and an ultrasonic scanning and surface analysis technology are combined. Honeycomb-shaped cracks left on the surface of the blade of the blade disc through milling are successfully repaired, and the surface quality of the blade disc is remarkably improved. According to the device and method, the repairing effect is excellent, the polishing efficiency is remarkably improved, and the time needed by traditional manual polishing can be greatly shortened. In addition, the surface roughness of the bladed disc repaired through the composite laser polishing repairing method is remarkably reduced, and the influence on the flowing property of working fluid is effectively controlled. Therefore, the method has important engineering application prospects and is expected to bring remarkable method progress and economic benefits in the field of aero-engine manufacturing.

The invention discloses a heavy metal pollution remediation material combining minerals and bacteria and a preparation and remediation method thereof. The heavy metal pollution remediation material comprises the following components in parts by mass: 50 parts of clay minerals, 30 parts of phosphate minerals, 10 parts of bacteria and the balance of organic fertilizer as a matrix, wherein the clay mineral is attapulgite, the phosphate mineral is apatite, and the bacteria are one of enterobacter. By combining the characteristics of minerals and bacteria, the remediation material has strong adsorption capacity and can effectively remove heavy metal ions in soil. Meanwhile, the enterobacter converts heavy metal ions into insoluble precipitates through a bioremediation mechanism of the enterobacter, such as adsorption, reduction, chelation and the like, so that subsequent treatment is facilitated. The metabolic activity of the enterobacter in the soil can promote the growth and activity of soil microorganisms, increase the content of beneficial elements in the soil, improve the soil structure and improve the soil quality.

The invention discloses a bone joint repairing composition containing stem cell vesicles and application of the bone joint repairing composition, and relates to the technical field of bone joint repairing compositions.The bone joint repairing composition is prepared from, by weight, 90-110 parts of stem cell vesicles and 41-57 parts of thelenota ananas saponin Ananaside A. The stem cell vesicles and the thelenota ananas saponin Ananaside A are combined to form the bone joint repairing composition. The stem cell vesicles are extracellular vesicles derived from human amniotic mesenchymal stem cells. According to the bone joint repairing composition provided by the invention, the stem cell vesicles and the thelenota ananas saponin in a proper proportion are matched for use, so that the synergistic interaction between the stem cell vesicles and the thelenota ananas saponin is realized. Animal experiments show that the composition has a remarkable repairing effect on a rat model with bone and joint injuries, can effectively relieve bone and joint pain symptoms of rats, not only widens the application field of human amniotic mesenchymal stem cell-derived extracellular vesicles, but also provides a new clinical treatment means for bone and joint repairing.

The invention provides gas-electricity coupled gelatin and sodium alginate composite hydrogel as well as a preparation method and application thereof, and belongs to the technical field of biological materials. The gas-electricity coupled gelatin and sodium alginate composite hydrogel disclosed by the invention is prepared from the following raw materials in parts by weight: 1 to 10 parts of gelatin, 1 to 10 parts of sodium alginate, 0.1 to 1 part of polyphenol modified fibroin microfiber coupled with 3, 4-ethylenedioxythiophene, 0.05 to 0.5 part of sodium hydrosulfide loaded bovine serum albumin nanoparticles, 1 to 10 parts of polyethylene glycol diglycidyl ether and 100 to 200 parts of water. The hydrogel has good biocompatibility and mechanical properties, is good in stability, can slowly release hydrogen sulfide gas, has relatively good conductivity, has anti-inflammatory and immunoregulation effects, can attract stem cells and promote angiogenesis and bone formation, has an excellent repair effect on diabetic periodontitis, and has a good application prospect.

The invention provides a preparation method of a gradient bionic rotator cuff repair stent, the stent prepared by the method and application. The method comprises the following steps that 1, a gradient fiber structure is designed through conventional 3D modeling software; step 2, adding the raw materials into the barrel material, and printing a tendon scaffold by adopting a near-field direct-writing melting technology; 3, raw materials in the barrel material are replaced, and the cartilage scaffold is printed through the near-field direct-writing melting technology; optionally, replacing the raw materials in the barrel material, and printing the mineralized cartilage scaffold by adopting a near-field direct-writing melting technology; and 4, replacing the raw materials in the barrel material, and printing the bone scaffold by adopting a near-field direct-writing fusion technology. The stent disclosed by the invention has a structural gradient and a component gradient, is matched with natural bone tissues, and can better promote the repair of the bone tissues.

The invention provides a python oil composition with a skin repairing function after sunburn and a preparation method thereof. The raw materials include python oil extract, allantoin, glycerol, carboxymethyl chitosan, sodium hyaluronate and frankincense resin extract. The cumulative permeability of the python oil composition of the invention within 6 hours is as high as 83%, the DPPH free radical scavenging rate is 90%, and the hydroxyl free radical scavenging rate is 87%, indicating that the python oil composition has a good permeability effect and is conducive to quickly repairing the skin state after sunburn.

The invention relates to shampoo based on moringa seed and fruit extracts and a preparation method of the shampoo, and belongs to the technical field of shampoo. The shampoo based on the moringa seed and fruit extract is prepared from the following raw materials in parts by weight, comprising 5-15 parts of a moringa seed extract, 5-15 parts of a polygonum multiflorum root extract, 5-15 parts of a cacumen biotae extract, 5-15 parts of a vitex trifolia fruit extract, 2-8 parts of a camellia seed extract, 2-8 parts of a mint extract, 2-8 parts of a ginseng root extract, 2-8 parts of a folium artemisiae argyi extract, 2-8 parts of a ganoderma atrum extract, 15-25 parts of a black tea fermentation product, 5-15 parts of polypeptide, 4-8 parts of amino acid and 150-200 parts of water. By compounding the plant extract, the black tea ferment, the polypeptide and the amino acid, the shampoo is refreshing, mild and non-irritant, has obvious effects of removing dandruff, relieving itching, controlling oil and preventing hair loss, and has the effects of scalp care and hair nourishing.

The invention discloses a land reclamation temporary remediation site applied to land resource management and a remediation device thereof, and relates to the technical field of soil remediation, the land reclamation temporary remediation site comprises a placement base, a leveling assembly is arranged on the placement base, a remediation base frame is arranged on the placement base, and a stable connecting assembly is arranged on the placement base; the repairing base frame is provided with a repairing spraying platform, a spraying mechanism is arranged on the repairing spraying platform, a storage assembly is arranged in the repairing base frame, a stabilizing mechanism is arranged on the repairing spraying platform, a liquid supplementing mechanism is arranged on the repairing base frame, a central control mechanism used for control is arranged on the repairing base frame, and a detection assembly is arranged on the peripheral side of the placing base. The land reclamation temporary restoration station and the restoration device thereof mainly surround land resource management, the damaged land is rapidly and effectively restored through a series of automatic and intelligent equipment, and an advanced and efficient solution is provided for sustainable management of land resources and ecological environment restoration.

The invention discloses an in-situ repair reagent for reverse osmosis membrane and an in-situ repair method for reverse osmosis membrane. The reverse osmosis membrane repair agent is composed of a repair agent A and a repair agent B, wherein the repair agent A is a mixed solution of dopamine hydrochloride, catechol, and tannic acid with a self-polymerizing polymer; and the repair agent B is a tris(hydroxymethyl)aminomethane hydrochloride) solution. The repair agent can perform in-situ repair on a reverse osmosis membrane with a desalination rate of 60-90%. The method can restore a reverse osmosis membrane with a desalination rate of 60-90% to a desalination rate of more than 95%, and the water flux of the repaired membrane is close to that of the original membrane. The repair agent has low cost, is environmentally friendly, and has a stable repair effect.

The invention discloses a preparation method and application of athlete-derived bifidobacterium probiotics for intestinal barrier repair, and relates to the technical field of biochemistry and microorganisms, and the preparation method comprises the steps of special bacteria source sampling, directional separation and purification, molecular biological identification, antibiotic sensitivity evaluation and injury repair verification. According to the preparation method and application of the sportsman-derived bifidobacterium probiotics for repairing the intestinal barrier, the sportsman intestinal flora is used as an exclusive bacterial source, and the unique metabolic elite attribute and stress adaptability of the sportsman intestinal flora are utilized to directionally screen and obtain a bifidobacterium strain adaptive to an extreme physiological stress environment; the bottleneck that conventional probiotics are only suitable for a common physiological environment and the survival rate and activity in a stress state are greatly reduced is broken through, high survival rate and metabolic activity can be kept in extreme environments such as exercise heat stress and the like, and accurate repair of intestinal barriers is realized through multiple mechanisms; meanwhile, an exclusive screening, identification and safety evaluation system is established, so that the safety and functional specificity of the strain are ensured.

A method for the combined restoration of high-molybdenum contaminated soil by plant-microorganism-biochar belongs to the technical field of soil restoration, and specifically relates to a method for the combined restoration of high-molybdenum contaminated soil by plant-microorganism-biochar. The purpose of the present invention is to solve the problem that the reports on existing molybdenum-contaminated soil treatment methods are extremely limited, and there is a lack of a bioremediation method suitable for heavy metal molybdenum in cold areas. Method: Disperse biochar evenly into the high-molybdenum contaminated soil, then sprinkle ryegrass seeds into the high-molybdenum contaminated soil, cover the top with soil, water the soil regularly to keep it moist, and then pour the liquid microorganism into the roots of the ryegrass, cultivate at room temperature or low temperature, and the restoration of the high-molybdenum contaminated soil is completed. Using the method of the present invention, under low temperature (10°C), the content of readily usable molybdenum is reduced by 32.2%. The present invention can obtain a method for the combined restoration of high-molybdenum contaminated soil by plant-microorganism-biochar.

This invention discloses a near-infrared responsive self-healing coating and its preparation method, relating to the field of functional coating technology. The near-infrared responsive self-healing coating, by weight, comprises the following components: 100 parts of matrix resin, 1-3 parts of near-infrared absorber, 10-20 parts of self-healing agent, 8-15 parts of curing agent, 1-3 parts of dispersant, 0.5-2 parts of defoamer, and 20-30 parts of solvent. This invention utilizes a specific structured organic molecular near-infrared absorber, which exhibits good compatibility with the matrix resin and achieves uniform dispersion at the molecular level. This avoids the problem of easy agglomeration in traditional inorganic photothermal materials, while significantly improving photothermal conversion efficiency and solving the deficiency of insufficient photothermal conversion capability of conventional organic dyes.

The present invention discloses a strain of Pseudomonas and its application in degrading pinene alcohol and remediating contaminated soil. The deposit number of the Pseudomonas sp. S4 is GDMCC No: 63948, which has been deposited in the Guangdong Provincial Microbial Culture Collection Center on October 31, 2023. The present invention provides a strain of Pseudomonas sp. S4 with the function of efficiently degrading pinene alcohol. The degradation rate of 350 mg / L pinene alcohol after culturing for 3 days under laboratory conditions is as high as 95%, and a composite surfactant containing monorhamnolipid and dirhamnolipid is produced, which can be used to repair soil contaminated by pinene alcohol and increase the diversity of microbial species in the soil. The combination with rhamnolipid or biochar can play a synergistic effect, and the repair effect is more significant, which provides a new technical option for the treatment of pinene alcohol pollution and has broad application prospects.

The invention relates to the technical field of plate repairing, and discloses a manufacturing method of a plastic wear-resisting plate repairing material and a repairing method using the plastic wear-resisting plate repairing material. The manufacturing method comprises the following steps: mixing preset parts by mass of ethylene-based resin and a curing agent, and stirring to form a first prefabricated mixture; adding a preset mass part of accelerant into the first prefabricated mixture, and stirring to form a second prefabricated mixture; and adding graphite powder in preset parts by mass into the second prefabricated mixture, and stirring until the graphite powder and the second prefabricated mixture are uniformly mixed to obtain the required repairing material. According to the manufacturing method, the repairing material with the high repairing level can be obtained through the mixed reaction of the vinyl resin, the curing agent, the accelerant and the graphite powder according to the preset mass parts. The method is simple, efficient and good in repairing performance.

The invention belongs to the field of skin medicine (collagen biomimetic material technology), and particularly relates to a high-activity triple-helix mini collagen for skin light injury repair, the high-activity triple-helix mini collagen successfully simulates the structure and function of natural collagen, has no cytotoxicity and good water solubility, and can be used for repairing skin light injury. The high-activity triple-helix mini collagen can promote adhesion, migration and proliferation of fibroblasts and has a remarkable repairing effect on skin damaged by ultraviolet rays, meanwhile, the preparation method of the high-activity triple-helix mini collagen is simple and convenient, conditions are mild, and the high-activity triple-helix mini collagen has wide application prospects in the fields of tissue regeneration, skin medicine and the like.

The present invention relates to an external hemostasis / internal repair double-layer composite stent and its preparation and application, comprising an inner layer of radially oriented nanofiber membrane and an outer layer of chitosan sponge with a gradient pore structure. The outer layer of the sponge with a gradient pore structure in the present invention can quickly absorb blood from the wound and stop bleeding under the action of the differential capillary effect; the radially oriented fiber layer has a cell guiding effect, and the radially oriented fiber structure can realize the release of chemokines at different concentrations from the center to the edge of the wound surface, which can guide the migration of stem cells around the damaged part to the center of the wound, while promoting the growth and adhesion of fibroblasts and accelerating wound repair.

The invention relates to the technical field of raw materials of skin care products, and particularly discloses an acne-removing composition as well as a preparation method and application thereof. The acne-removing composition comprises the following components in parts by mass: 1.32-4.6 parts of a composite extract; 0.01 to 0.02 part of a skin repairing agent; 10 to 20 parts of a humectant; 75.38 to 88.67 parts of a solvent; the composite extract is prepared by compounding codium tomentosum extract, cryptomeria fortunei bud extract, nymphaea tetragona flower extract, reed extract and ganoderma sinensis extract. The acne-removing mask has the advantages that the acne-removing effect is more thorough, and acnes are not easy to relapse.

The invention provides a liquid dressing and a preparation method thereof, and belongs to the technical field of skin barrier repair and treatment.The liquid dressing comprises four phases of raw materials, a phase D comprises p-hydroxyacetophenone, 1, 2-hexanediol, 1, 3-butanediol and the like, and a phase D comprises p-hydroxyacetophenone, 1, 2-hexanediol, 1, 3-butanediol and the like; the phase C comprises triethanolamine, deionized water and the like; the phase B comprises allantoin, carbomer, various sodium hyaluronates, glycerol and the like; the phase A comprises cetostearyl alcohol, beheneth-22 and the like. The preparation method comprises the following steps: heating the phase A to 80-85 DEG C; heating the phase B to 80-85 DEG C, and keeping the temperature for 20 minutes; adding the phase B into a homogenizer, stirring, adding the phase A, emulsifying at 80 DEG C, cooling and homogenizing; cooling to 75-60 DEG C, adding the phase C, and homogenizing; cooling to below 45 DEG C, adding the phase D, and uniformly stirring; the dressing can form a skin defense film, protect a corium layer, deeply preserve moisture and block bacteria, sodium hyaluronate has the effects of resisting inflammation, repairing and the like, and butyrospermum parkii butter can moisten skin and improve skin resistance.

The present invention provides a montmorillonite-reinforced hybrid fiber-bonded 3D printed implant, which is composed of a 3D printed stent with a polydopamine coating and a montmorillonite-reinforced hybrid fiber, wherein the 3D printed stent with a polydopamine coating has mutually interpenetrating micrometer-level macropores, and the montmorillonite-reinforced hybrid fiber is bonded to the 3D printed stent with a polydopamine coating and distributed in the micrometer-level macropores of the 3D printed stent with a polydopamine coating, forming micrometer-level small pores in the micrometer-level macropores; the montmorillonite-reinforced hybrid fiber is formed by multiple chemical reactions of a polymer material having a catechol functional group, collagen and micrometer-level montmorillonite; the polydopamine coating on the surface of the 3D printed stent with a polydopamine coating and the montmorillonite-reinforced hybrid fiber are bonded together by multiple chemical bonds and intermolecular forces. The present invention also provides a preparation method of the above-mentioned implant and its application in the field of bone repair.

This invention discloses a large-scale grass seeding device for grassland ecological restoration, belonging to the field of grassland ecological restoration technology. The device includes a seeding frame with two rows of plow blades mounted on its lower surface, the blades being staggered in position. Each plow blade has a cutting section at its front end, which is triangular in shape, and a supporting section at its rear end, which has a symmetrical butterfly-wing structure. The cutting section cuts linear planting grooves into the soil. A connecting rod is rotatably connected to the rear end of the seeding frame via a bearing, and a pressing roller is rotatably connected to the end of the connecting rod. This invention employs a triangular cutting section for linear grooving, only subjecting the soil to narrow-slit, linear, and minimal disturbance. The working surface is narrow and the depth is controllable, without damaging the original structure of the grassland surface. It can completely preserve the crust layer and litter layer, maximizing the soil's water retention, soil stabilization, and wind erosion resistance, thus preventing secondary degradation of the grassland ecosystem from the source and truly achieving protective ecological restoration.

This invention relates to recombinant mussel adhesive proteins, the nucleic acid molecules encoding them, nucleic acid constructs, expression vectors, recombinant engineered strains, pharmaceutical compositions, preparation methods, purification methods, and applications. This invention assembles and splices partial functional sequences from different mussels and type III collagen to obtain several novel mussel adhesive protein sequences. Further screening yielded recombinant mussel adhesive proteins Mfp5, Mfp55, Mfp131, and Mfp151, suitable for large-scale industrial production and exhibiting high expression levels. Efficacy experiments demonstrated that these proteins significantly promote cell migration, indicating their excellent cell repair function and broad application prospects.

The application discloses a kind of hydrogel microneedle patches based on bletilla striata polysaccharide composite engineered exosome and its preparation method and application, belong to the technical field of biomedical materials, with bletilla striata polysaccharide and methacrylated hyaluronic acid as matrix, and the hydrogel microneedle with excellent mechanical properties is prepared.The natural polyphenol caffeic acid is used to modify the bone marrow mesenchymal stem cell exosome, and the engineered exosome is loaded on the microneedle tip by centrifugation.The strong antioxidant capacity of caffeic acid is used to protect the structure of exosome, and a synergistic system is formed, combined with the antibacterial and anti-inflammatory properties of the bletilla striata polysaccharide matrix itself, the diabetic wound microenvironment can be improved from multiple dimensions such as bacteriostasis, antioxidant, anti-inflammatory and pro-angiogenesis.The preparation process of the application is simple and controllable, the product has high biological safety, and the active ingredients can be delivered precisely and minimally invasively, providing an efficient and safe solution for diabetic chronic wound repair.

The invention relates to the technical field of biomedical hydrogel materials, in particular to temperature-sensitive modified chitin, a preparation method and application, the temperature-sensitive modified chitin is characterized in that a chitin molecular chain comprises a substituent group A and a substituent group B; the structural formula of the substituent group A is as shown in formula (I-2), and m is any integer from 0 to 100; the substitution degree of the substituent group A is 0-35%; the temperature-sensitive modified chitin is synthesized by taking any one of temperature-sensitive hydroxypropyl chitin, temperature-sensitive hydroxyethyl chitin and temperature-sensitive hydroxybutyl chitin as an initial raw material and taking a compound 1-(oxirane-2-yl)-(PEG) m-carboxylic acid as a substituent group; the injectable hydrogel prepared from the temperature-sensitive modified chitin has the advantages of favorable mechanical properties, favorable stability, lower degradation rate and excellent lubricating effect. And the adhesive can be applied to the aspects of adhesion in an operation, tissue filling, post-operation adhesion prevention, orthopedic treatment and the like.

The invention relates to the technical field of nursing materials, and discloses eye washing liquid for relieving eye fatigue and a preparation method thereof.The eye washing liquid is prepared from trehalose, taurine, sodium gualenate, sodium hyaluronate, ergothioneine, vitamin B12, vitamin B6, xanthophyll, mint, a humectant, a bacteriostatic agent, a chelating agent, a pH regulator and deionized water. Through the synergistic effect of the first synergistic composition and the second synergistic composition, retina cell injury induced by blue light can be effectively repaired, the repairing effect is superior to that of simple addition of a single component, blue light oxidative injury is repaired through a multi-target synergistic mechanism, a three-layer structure of a tear film lipid layer, a water layer and a mucoprotein layer can be reconstructed, and the repairing effect is good. According to the present invention, the tearable film stability is significantly improved, the excellent protection and repair effect is provided, the compatibility of the components is good, the product stability is high, and the multiple effects of ocular surface cleaning, asthenopia relieving, conjunctival congestion reducing and blue light oxidation damage preventing are provided.

The invention discloses a wall crack repair material, which is a water-based penetrating inorganic waterproofing agent, comprising, by mass percentage, 30-50wt% of an alkali metal silicate aqueous solution and 0.2-5wt% of a penetrating crystallization functional auxiliary agent, and the rest being water; wherein the alkali metal silicate aqueous solution is selected from at least two of a sodium silicate aqueous solution with a mass fraction of 30-40%, a potassium silicate aqueous solution with a mass fraction of 30-40%, or a lithium silicate aqueous solution with a mass fraction of 20-30%, and the like; and the penetrating crystallization functional auxiliary agent comprises, by mass percentage, 55-65% of EDTA-4Na, 15-25% of triethanolamine, 5-15% of citric acid, 6-10% of sodium polyacrylate, and 1-3% of sodium dodecylbenzene sulfonate. When repairing wall cracks, first clean the wall at the cracks, remove dust, dirt and loose parts on the surface, repair and smooth the roughness, pits and other defects with cement-based materials, and then use U-shaped sealing strips, water-absorbent resin curing films or a combination of the two to repair the cracks or fissures on the wall.

The invention relates to the technical field of house repairing, and discloses a bare brick wall repairing construction method which comprises the following steps: determining the surface layer condition of a bare brick wall, and cleaning the base layer of the bare brick wall; the surface damage degree of the bare brick wall is determined, and the surface damage of the bare brick wall is repaired; determining the damage degree of the damaged part of the bare brick wall, and repairing the damaged part of the bare brick wall; and repairing mortar joints of the plain brick wall. The problems that according to an existing bare brick wall repairing method, brick faces are prone to being damaged, really valuable parts of the bare brick wall cannot be reserved, and the repairing effect is poor are solved.

The invention discloses a mineral and fungus combined heavy metal pollution remediation material and a preparation and remediation method thereof. The heavy metal pollution remediation material comprises the following components in parts by mass: 40 parts of clay minerals, 40 parts of phosphate minerals, 5-10 parts of fungi and the balance of an organic material matrix, wherein the clay mineral is zeolite, the phosphate mineral is apatite, and the fungus is one of penicillium fungus. The repairing material with high adsorption capacity is formed by utilizing the porous structure of minerals and combining the biological activity of fungi; the structure can effectively adsorb heavy metal ions in soil, and migration and diffusion of the heavy metal ions in the soil are reduced; experiments show that the content of heavy metal ions in soil can be effectively reduced. Based on more detailed and specific consideration and research, the invention further provides a preparation method of the heavy metal pollution remediation material and a soil remediation method, so that the optimal remediation effect is achieved.

The invention discloses application of itaconic acid in preparation of a product for repairing damaged hair and a composition of the itaconic acid, the composition comprises itaconic acid and a pH regulator, and the pH regulator is sodium hydroxide or arginine. The invention proves that the itaconic acid and the composition thereof have the characteristics of repairing hair cores and strengthening and toughening hair.