In the process of plant growth, photosynthesis of plants is a very important life activity, so the health of the leaves has a very important influence on the growth of plants. The leaves of plants are applied to biological biochemistry, physiology and ecology, and crop cultivation. Therefore, it is of great significance to the accuracy or deficiency of the leaf area per unit of the subject. There are many methods for measuring the leaf area, such as leaf area measurement, grid paper or weighing, etc., to investigate leaf area.
Tripterygium is widely distributed in the southern provinces of the Yangtze River Basin, and is an important medicinal material for the treatment of diseases such as rheumatism, nephritis, and surgical skin diseases. There are dozens of pharmaceutical companies that use Tripterygium as raw materials. Tripterygium leaves, branches, roots, etc. The parts contain active ingredients such as formazan, and the leaves are also the main raw materials for extraction of medicinal ingredients. Using leaf area meter to study the leaf area of ​​Tripterygium wilfordii has practical significance for the prediction of leaf yield.
The coefficient determined by the linear relationship between the length of the blade and the product of the maximum width and the actual area of ​​the blade is called the leaf area index. The leaf area coefficient K = leaf area A (leaf length @ leaf width). The leaf area coefficient is constrained by the leaf shape. The leaf shape is controlled by several pairs of alleles, photoperiods, and temperature. Therefore, different leaf species, leaf age, and environment have different leaf area coefficients. Bryan et al. believe that leaf area coefficient varies between years. There was a slight change, but remained basically stable during the same year.
By fitting, there was a high positive correlation between leaf length, leaf width, leaf length @ leaf width and leaf area of ​​Tripterygium wilfordii, of which leaf length @ leaf width and leaf area had the highest correlation coefficients, followed by leaf width. The leaf length regression equation is the smallest, and the three simple linear regression equations reach extremely significant levels. The one-dimensional linear regression equation y=-0.318406+0.6607429x which can be used to determine the relationship between the leaf area and the leaf length-width product can be used as the leaf area estimation equation. The measured results are more accurate. Using the three empirical formulas to calculate the theoretical value of the total leaf area of ​​about 100 leaves compared with the actual value, the error between the measured value and the actual value of the spindle-shaped formula is the smallest, and the error is within 3%. This method is accurate, simple, and fast. The calculation formula for the area of ​​Tripterygium wilfordii leaves is used in production practice.
The use of a living leaf area meter for the measurement of the leaf area of ​​Tripterygium wilfordii has a very conspicuous advantage, that is, there is no need to destroy the leaf, and the area of ​​the leaf can be determined accurately. This ensures the healthy state of growth of Tripterygium wilfordii, and the application of the living leaf area meter accelerates the determination of the leaf area and improves the research efficiency.
Product Description: Vanadium aluminum carbide ceramic powder is prepared by sintering V, Al, C powder mixture by high temperature plasma, after mechanical crushing and inert gas grinding.
Packaging specification: fixed packaging 5/10/50/100/500 g, or packaging according to customer requirements;
Intended use: It is used to prepare MXenes by chemical etching for the scientific research needs of physical and chemical experiments;
essential information:
1. Chemical formula: V2AlC
2. Composition elements: V, Al, C
3. Relative molecular weight: 140.8645
4. Chemical state: micro nano sized particles
5. Appearance and properties: dark brown particles with micro nano size
Product performance index:
1. Crystal structure: hexagonal, P63/mmc [194]
2. Cell parameters:
a=2.913 Ã…,b=2.913 Ã…,c=13.14 Ã…;
α= 90, β= 90, γ= 120;
3. PDF No.: 29-0101 (refer to the PDF-2004 database of the International Diffraction Data Center);
4. Density: 3.99 (g/cm3);
5. Boiling point:
6. Melting point:
Storage conditions and validity:
This product should be stored in room temperature and dry place, avoid contact with acid, alkali and other liquids, long-term storage will happen slow oxidation.
Test method:
This product can be confirmed by X-ray powder diffractometer crystal results; Element composition was confirmed by energy dispersive X-ray detector. The same morphology characterization was used to characterize the particle morphology. The particle size distribution was evaluated by laser particle size analyzer.
Safety protection:
1. Health hazards
Hazardous category: Non-hazardous chemical chemical category: ceramic powder;
Route of invasion: inhalation, ingestion;
Health hazards: dust in the eye has irritation, oral stimulation of gastrointestinal tract;
2. First aid measures
Skin contact: Remove contaminated clothing and rinse skin thoroughly with running water.
Eye contact: lift eyelid and rinse with plenty of running water or normal saline for at least 15 minutes;
Inhalation: Get away from the scene to fresh air quickly;
Ingestion: drink enough warm boiled water, induce vomiting, seek medical advice;
3. Ignition and explosion characteristics and fire protection
Flammability: non-flammable;
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