Many people like to use abbreviations to express some meanings, because the full names of some nouns are really long and troublesome. The following small series will tell you what ca means.
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Ca is the abbreviation of English Cancer, which is translated as cancer in Chinese. Cancer refers to a malignant tumor originating from epithelial tissue. It is suggested that the tertiary prevention of tumors should be done in peacetime to reduce the occurrence of tumors. Its occurrence is related to the following factors: 1, bad living habits, such as smoking, drinking spirits, eating overheated food, and unreasonable diet, such as high-fat diet and eating moldy food. 2. Environmental pollution, air, drinking water and food pollution will do harm to human beings. Carcinogens announced by the World Health Organization include arsenic, asbestos, benzidine, chromium, radioactive radon, coal tar and mineral oil. 3. Infection, mainly virus infection, such as hepatitis B virus and aflatoxin, is related to the occurrence of liver cancer; Human papillomavirus infection is related to cervical cancer; Helicobacter pylori infection is related to the occurrence of gastric cancer; EB virus infection is related to the occurrence of nasopharyngeal carcinoma. 4. Radiation, such as radionuclides, X-rays and ionizing radiation. 5. Endogenous factors, including genetic factors and immune factors, such as congenital or acquired immunodeficiency disease, are prone to tumors. 6. Endocrine factors such as estrogen and prolactin are related to the occurrence of breast cancer.
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Chemical Abstracts (CA) is the largest chemical abstracts repository in the world. It is also the most widely used and important retrieval tool for chemistry, chemical engineering and related disciplines in the world. The CA report, edited and published by CAS of American Chemical Society, was founded in 1907, covering almost all fields of interest to chemists, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry and polymer chemistry, as well as metallurgy, geochemistry, pharmacology, toxicology, environmental chemistry, biology and physics. CA features: large amount of information collection and wide range of collection.
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The English alias of calcium is CalciumshotNmmdia calcium ion. Calcium chips. Calcium is a metal element, with symbol Ca, which is located in the fourth period and IIA group of the periodic table of chemical elements. It is silvery white crystal at room temperature. Animal bones, mussels and eggshells all contain calcium carbonate. It can be used as alloy deoxidizer, petroleum dehydrating agent, metallurgical reducing agent, iron and ferroalloy desulfurization and decarbonization agent, vacuum tube getter, etc. Its compounds are of great use in industry, construction engineering and medicine.
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CA is the issuing authority of certificates and the core of public key infrastructure (PKI). CA is the authority responsible for issuing certificates, authenticating certificates and managing issued certificates. A CA has a certificate (including a public key and a private key). Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it. If a user wants to obtain a certificate of his own, he should apply to CA first. After the CA recognizes the identity of the applicant, it assigns a public key to it, and the CA binds the public key to the identity information of the applicant, and forms a certificate after signing it and sends it to the applicant.