36 results about "Metal toxicity" patented technology

The invention discloses high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) and a manufacturing method thereof. The stainless steel comprises carbon, silicon, manganese, chromium, molybdenum, copper, nitrogen, niobium, silver and the balance of iron by weight percent; the high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) is of a single austenite structure after subjected to solution treatment, and is excellent in pitting corrosion resistance in a non-microorganism environment and good in bacterial resistance and microorganism corrosion resistance in a microorganism environment; the antibacterial rate of the stainless steel on staphylococcus aureus and escherichia coli reaches more than 93%; the nickel release risk is inexistent; the manganese release rate in artificial saliva and sweat is much lower than the acceptable daily intake standard; the stainless steel can be used as a biomedical material; and the metal toxicity risk is inexistent. The high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) is very good in flexibility and plasticity, can meet the processing requirements of fine parts such as jewelries and the like, and is superior to chromium-nickel austenite antibacterial stainless steel of 316 L and the like in overall performance.

The invention discloses a method for predicting wheat root elongation toxicity of nickel ions in soil, and an application thereof, and belongs to the field of ecological heavy metal toxicity assessment. According to the method disclosed by the invention, the toxicity competitive inhibition effect of Ca<2+> and other cations on the nickel ions is considered, the influence of the osmotic pressure effect in soil conditions to the toxicity is corrected, and meanwhile the toxic effect of nickel is calculated by obtaining the activity of the nickel ions by using the visual MINTEQ program. Firstly, biological toxicity suppression parameters of the cations to the nickel ions, and the toxic effect parameters and the osmotic pressure parameters of the nickel are determined under a sand culture condition, the obtained parameters can be applied to the prediction of the wheat root toxicity of the nickel ions under different soil types, and the method is also applicable to predicting the root elongation toxicity of nickel ions to other crops and can provide reference for soil heavy mental ecological risk assessment and soil pollution abatement.

The invention discloses an organic bacterial fertilizer for the restoration of manganese ore-polluted soil, as well as a preparation method thereof. The organic bacterial fertilizer comprises the following raw materials in parts by mass: 3-5 parts of basic nutrient solution, 20-25 parts of remissive complex organic raw materials, 70-75 parts of water retention media and 3-5 parts of anti-manganese complex microbial agent. The preparation method comprises the mixing and fermentation steps. The organic bacterial fertilizer for the restoration of manganese ore-polluted soil has the effects that the soil structure is modified, the water retention and constant temperature can be achieved, the toxicity of heavy metals around roots can be reduced, the survival rate of plants can be increased, and the growth of plants can be promoted; in addition, the toxicity of manganese elements in the soil of plant roots can also be effectively relieved, the effect of the organic fertilizer can be enhanced, and the restoration capability of plants can be enhanced.

The present invention relates to a seawater quality reference prediction method based on a quantitative structure-activity relationship of metal and metalloid. According to the method, the toxic endpoint of unknown metal is predicted according to a quantitative relationship between the structural feature of metallic ions and the marine life acute toxic effect, and a risk concentration for protecting different proportions of marine life is analyzed and deduced in conjunction with sensitivity distribution of different species; and a QSAR metal toxicity prediction model is established by integrating metal physical and chemical structure parameters and toxic mechanisms of different marine life and is applied to prediction of an unknown seawater quality reference maximum concentration. The seawater acute reference prediction method based on the metal quantitative structure-activity relationship is based on the ecology principle; the system screens various marine species and takes the screened marine species as smallest biological prediction sets; and single-parameter toxicity prediction models are established separately, thereby improving the model precision and prediction ability.

Embodiments of the present invention relate generally the use of certain compositions, e.g., compositions comprising a glutathione precursor and a selenium source, in the therapy of viral diseases and/or reducing the incidence of viral diseases. Related embodiments of the present invention relate to treatment and/or reducing the incidence of respiratory ailments caused by respiratory syncytial virus (RSV) or hemorrhagic fever (EHF) caused by Ebola viruses (EBV) or Marburg virus. Yet in other embodiments, the invention relates to reducing metal toxicity in a biological system, which involves contacting the biological system with a composition comprising a glutathione precursor and a selenium source, optionally together with a chelating agent, an antioxidant, a metallothioneine protein or a fragment of metallothioneine.

The invention relates to the field of water quality pollution evaluation, in particular to a fresh water chronic standard prediction method based on the metal quantitative structure-activity relation. The method includes the steps of predicting the unknown metal virulence terminal point according to the quantitative relation between the structure characteristics of heavy metal ions and the choric toxicity effect of aquatic organisms, and conducting analysis and derivation to obtain the danger concentration that protects aquatic organisms of different ratios through the combination with the sensitiveness distribution of different species. According to the method, the QSAR metal toxicity prediction model is established by synthesizing heavy metal physicochemical structure parameters and toxication mechanisms of different aquatic organisms, and the model is used for predicting the unknown standard continuous concentration. On the basis of the ecology principle, six phyla and eight families of aquatic organisms are screened through a system to serve as a minimum biological prediction set, single-parameter toxicity prediction models are established, and the model accuracy and the prediction capacity are improved.

The invention relates to preparation of a tungsten disulphide nanosphere/carbon nano fibre composite material and application thereof in detecting dopamine in an electrochemical mode, which belongs tothe technical field of novel function material and bio-sensor detection. The preparation aims to solve the problem that an existing material is high in cost, is low in metal toxicity and sensitivityand is low in selectivity while detecting dopamine. The preparation mainly comprises the following steps: I, preparing carbon nano fibres through an electrostatic spinning method; and II, preparing the tungsten disulphide nanosphere/carbon nano fibre composite material through a hydrothermal method. The tungsten disulphide nanosphere/carbon nano fibre composite material prepared by the preparationhas the advantages of great specific surface area, high conductivity, good biocompatibility and the like, and can be used as an electrode material for detecting dopamine.

Aiming at the defects in the prior art, the invention provides bacillus tropicalis capable of tolerating the toxicity of heavy metals and effectively degrading waste engine oil and an application of the bacillus tropicalis. The bacillus tropicalis is preserved in Guangdong Microbial Culture Collection Center on May 24, 2021, and the preservation number is GDMCC No.61680. The strain can tolerate the toxicity of high-concentration heavy metals, and meanwhile, the strain grows by taking waste engine oil as a carbon source and degrades the waste engine oil. The strain can be used for degrading waste engine oil with heavy metals in soil.

The invention discloses a prediction method of a cadmium-nickel compound on the root elongation toxicity of wheat in soil and application of the prediction method, and belongs to the technical field of ecological heavy metal toxicity assessment. According to the prediction method, on the basis that known competing cations of Cd<2+> and Ni<2+> are H<+> and Mg<2+>, the toxicity inhibition effect ofthe competing cations and osmotic pressure impact of a saline solution are considered, and the combined toxicity effects of Cd and Ni are calculated by adopting a single toxic concentration addition method. The prediction method includes the steps that firstly, a sand culture experiment is used for obtaining Cd-Ni compound toxicity effect parameters and osmotic pressure effect parameters of the saline solution, and then the obtained parameters are applied to prediction of the Cd-Ni compound toxicity effects in different soil. The prediction method is also applied to prediction of the Cd-Ni compound on the root elongation toxicity effects of other crops, and a new method is provided for soil heavy metal ecological risk assessment and regional soil pollution control.

The invention provides a soil metal toxicity prediction method and device, electronic equipment and a storage medium. The method comprises the steps of: firstly determining the dosage of each metal element in to-be-predicted soil according to the obtained physicochemical property parameters of the to-be-predicted soil and the total concentration of the metal elements; and then determining characteristic parameters of to-be-detected metal ions in the to-be-predicted soil, and predicting the metal toxicity effect of the to-be-predicted soil through a soil metal toxicity prediction model. Due to the adoption of the soil metal toxicity prediction model, the metal toxicity effects under different soil environment conditions can be accurately predicted while geometric number-level ecological toxicology tests are avoided. Meanwhile, due to the fact that establishment of the ecological risk and the restoration standard of the metal elements is relatively slow, the soil metal toxicity prediction model can predict unknown metal toxicity data, is suitable for soil environment conditions with a wide range, provides a basis for metal ecological risk evaluation and corresponding standard formulation, and has a wide application prospect.

Metal binding polycarboxylated porphyrins, their precursors, or cofactors in the porphyrin biosynthetic pathway, are administered to individuals determined to be subject to or predisposed to a polycarboxylated porphyrin-binding metal toxicity to increase the level of the metal-binding polycarboxylated porphyrin in the individual.

A method for treating stroke in a subject includes administering to the subject a composition that includes a compound having a structure represented by Formula 1 as an active ingredient. The composition may treat a stroke by inhibiting 5′ adenosine monophosphate-activated protein kinase (AMPK) activity of zinc neurotoxicity which is a main cause of strokes. The stroke may include hemorrhagic stroke, ischemic stroke or metal toxicity stroke.

The invention discloses a remediation agent for lead-cadmium-chromium contaminated soil and a remediation method for the lead-cadmium-chromium contaminated soil. The remediation agent comprises the following components in percentage by mass: 10%-30% of magnesium oxide, 5%-20% of dihydric phosphate, 10%-75% of crystalline clay mineral and 10%-40% of an amorphous clay mineral. The remediation method comprises the steps that the remediation agent and the lead-cadmium-chromium contaminated soil are mixed and stirred for 30-60 min so as to obtain mixed soil; and water with a mass 3-10 times the mass of the contaminated soil is added, the water content of the mixed soil is kept, and maintenance is conducted for 3-5 days. The remediation agent provided by the invention can improve the form stability of lead, cadmium and chromium in soil and reduce a metal toxicity leaching concentration, has high efficiency, is reduced in use amount, lowers the remediation cost to the maximum extent, and can be applied to the field of treatment and remediation of lead-cadmium-chromium contaminated soil.

The invention relates to a method for synergistically curing heavy metal Cr-Ni-Mn in stainless steel slag by using glass ceramic, the prepared glass ceramic is composed of spinel, diopside/pyroxene and a glass phase, the heavy metal Cr and Mn are cured in the spinel and induce the diopside/pyroxene to crystallize, and the heavy metal Ni is cured in the pyroxene crystal phase. The method comprises the steps of mixture preparation, basic glass formation, glass ceramic material preparation, heavy metal toxicity leaching evaluation and the like. By virtue of a glass ceramic preparation technology, harmful heavy metals Cr and Mn in the stainless steel slag are utilized to form spinel to induce diopside and Ni-containing pyroxene crystal phases to be separated out, and the synergistic curing effect of Cr, Ni and Mn in the stainless steel slag is exerted, so that harmless treatment of the stainless steel slag is realized; the prepared glass ceramic material can be widely applied to industries such as electric power, chemical engineering, coal and ferrous metallurgy, and resource utilization of the stainless steel slag is realized. And meanwhile, a new thought is provided for harmless treatment and resource utilization of industrial solid wastes such as smelting slag, tailings and incineration ash containing harmful heavy metal elements.