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Se denominan elementos biogénicos o bioelementos a todos los elementos químicos que forman parte de los seres vivos. Estos elementos se pueden agrupar en tres categorías: Bioelementos primarios o principales:
1. Resumen. Para esta práctica se pretendía realizar la identificación de lípidos insaturados mediante prueba de yodo con el reactivo de Hübl, la identificación de proteínas por la prueba de Biuret en y observar cómo se pueden desnaturalizar las proteínas ante la presencia de ácidos o bases. Estos procedimientos se realizaron en varias muestras como leche, jugo, clara de huevo, yema de huevo y aceite. Al terminar de la práctica pudimos determinar que la leche da positivo para proteínas por su alto contenido de caseína, al igual que la clara de huevo es rica en albúminas. Por otro lado la identificación de lípidos insaturados arrojó resultados positivos para el aceite de cocina y la clara de huevo y finalmente pudimos observar como variaciones en el pH puede afectar de una u otra manera el comportamiento de las proteínas y así visualizar su comportamiento a ambientes ácidos y básicos arrojando como resultado la observación de la desnaturalización de las albúminas de la clara de huevo. Palabras clave: Proteínas, lípidos insaturados, pruebas cualitativas, identificación, desnaturalización. Abstract. In this this practice it was pretended to identify unsaturated lipids by iodine test with Hübl's reagent, to identify proteins by Biuret's test and to observe how proteins can be denatured by the presence of acid or alkali compounds. These procedures were performed on several samples such as milk, orange juice, egg white, egg yolk and oil. At the end of the practice we were able to determine that milk is positive for proteins because of its high casein content, just as egg white is rich in albumin. On the other hand the identification of unsaturated lipids gave positive results for cooking oil and egg white and finally we could observe how variations in pH can affect in one way or another the behavior of proteins and thus visualize their behavior to acidic and alkaline environments resulting in the observation of the denaturation of albumin of egg white.
Hadashot Arkheologiyot 136, 2024
During May-June 2020, a trial excavation was conducted by the authors on the southwestern outskirts of the ancient city of Paneas, within the declared antiquities site of Banias and north of Kibbutz Senir (Permit No. A-8745; map ref. 2638/7947). The remains of the funerary structures of various types uncovered in this part of the suburbs of Roman Paneas, along with the rich ceramic, glass, and numismatic finds, open broad fields of research related to the material culture and burial customs of the ancient residents of the area.
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