The rapid and accurate identification of watermelon seeds is a highly desirable technique both in the production of watermelons and in the management of seeds. The method of accurately identifying watermelon seed mainly includes sensory identification, chemical identification and germination test.
(1) Sensory identification: It is through the identification of the color, smoothness, smell, and seed characteristics of watermelon seeds. All new seeds generally have the inherent color of the species, and the seed coat has a glial substance and often adheres to a very thin white film; the seeds are glossy and have aroma. All Chen seeds, the color of the seed coat usually becomes dark and dull; the seed coat often has yellow spots or moldy substances, the cuticle shrinks and the seed coat becomes rough; the umbilical part (seed mouth) wavy lines deepen; insert the hand into the seed The inside feels coarse and slippery; the kernels are gray or white (waxy), unscented or even mildewy.
(2) Chemical identification: Due to the respiration of the seed, the drug undergoes a reduction reaction, thereby changing the color of the original seed kernel. The use of these drugs to change the length of color can identify new seeds. For example, watermelon seed is soaked with a chemical reagent (tetrazenium salt) (2,3,5-trichlorotetrazole) for 5 hours, and the degree of discoloration (redness) of the seed kernel is observed. This method is also called staining. law. Dyeing method used to identify the new degree of the seed is more accurate than the sensory identification, but it takes longer, faster than the germination test, and the accuracy is not as good as the germination test.
(3) Germination test: The germination test using the germination method can very accurately identify the fresh seeds of watermelon seeds. According to the seed germination rate, you can identify new seed. According to experiments, under the general storage conditions, seed watermelon seeds have a storage period of one year or less, and the germination rate can be maintained at 95%-100%. After storage for 2-3 years, the germination rate is 80%-95%. Storage 4-5 In 2003, the germination rate was 30% to 40%. After storage for 6 years or more, the germination rate was extremely low and even completely lost the ability to germinate. The use of germination tests to identify new seeds of watermelon seeds is very accurate, but it is more troublesome than sensory identification and chemical identification and requires more seeds to be consumed. Therefore, it is suitable for seeds with abundant seed sources and low prices, and is not suitable for rare and precious varieties.
Disposable Shoe Cover:
Destination: Barrier protection for food processing and handling, manufacturing, farming, painting, gardening, household cleaning, cooking, medical, surgical, pharmaceutical, protective, laboratorial, catering and industrial sectors. It is good for workers in hospitals, clinics, electronic workplaces, restaurants, hotels, catering, kitchens, food processing workshops
Composition: LDPE shoe cover is short for shoe cover made of low-density polyethylene. HDPE shoe cover is short for overshoes made of high-density polyethylene. Generally they are called disposable poly shoecover, or simply PE shoe cover. CPE shoe cover, made of chlorinated polyethylene, is good in quality with embossed surface. PP shoe cover is made from spun-bonded polypropylene non-woven fabric, can be coated with polyethylene films to offer so-called PP+PE shoe cover to provide tough, waterproof protection. PP shoe cover is also semi-coated with chlorinated polyethylene, CPE in short. With the above materials we offer our customers LDPE or CPE boot cover, PE boot cover, nonwoven boot cover, PP+PE boot cover.
Description:
A. CPE shoe cover & PE shoe cover: weight per piece available: 1.3g., 1.5g, 1.6g., 1.7g., 1.8g, 2g., 2.2g., 2.5g., 2.7g., 3g., 3.4g., 3.5g., 4g., 4.2g., 4.5g., 5g., 6g., 6.5g., 7g., 7.5g., 12g. with thickness of 0.02mm, 0.025mm, 0.035mm, 0.04mm, 0.038mm, 0.05mm, 0.08mm in various colours of white, yellow, blue, green, grey, pink, etc. Generally shoe cover below 4g. per piece is produced by machine automatically. Heavy duty shoe cover above 4.5g. per piece is made and sealed by hand as it's more thick and needs more elasticized thread.
B. PP shoe cover, PP+PE shoe cover, PP+CPE shoe cover: material weight per square meter: 25g., 27g, 30g., 35g., 37g, 38g., 40g., 50g., 55g., coated with PE completelly or coated with CPE in half as per the buyers' demand. It's tough, durable, breathable, water-repellent, disposable, and environmentally-friendly. Generally we offer white, yellow, green, blue, pink, purple, etc.
C. PP boot cover, PP+PE boot cover: material weight per square meter: 28g., 30g, 32g., 34g., 40g., 42g, 45g., 50g., 55g. coated or uncoated non-woven fabric. LDPE or CPE boot cover: weight per piece available: 13g, 14g, 16g, 21g., 23g, 24g, 28g, 31g, 32g, 33g. in colours of white, blue, red, black, etc. The opening at knee level is elasticated with or without fixation laces at ankles.
Feature: It is economic, convenient, waterproof, oil-proof for multiple usages in kitchen, hospital, hotel, barbershop, beauty salon, working plant, electronic workshop, labs, theatres, etc to protect you from dust, oil, chemicals and water.
Shoe Cover
Waterproof Shoe Cover,Disposable Surgical Shoe Cover,Protective Disposable Shoe Cover,Disposable Protective Shoe Cover
Guangzhou Aikangli Medical Technology Co., Ltd. , https://www.aikanli.com