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Verlag: GRIN Verlag, 2013
ISBN 10: 3656384665ISBN 13: 9783656384663
Anbieter: AHA-BUCH GmbH, Einbeck, Deutschland
Buch
Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Master's Thesis from the year 2004 in the subject Chemistry - Bio-chemistry, , course: M.Sc - Biochemistry, language: English, abstract: The hazards of exposure to ionizing radiation were recognised shortly after Roentgen's discovery of x-rays in 1895. Acute skin cancer, leukaemia and other biological damage were observed in the individuals working with x-ray generator. In the year, 1898 Becquerel performed the first recorded experiment in radiobiology, from this earlier study of radiobiology began. Since that time, a tremendous amount of research has been done attempting to interpret the reactions which take place from the moment that radiation enters a living cell until some permanent damage is produced. From beginning to end, these initial reactions are probably completed in a millionth of a second, making them very difficult to study. For this reason, it is still not known which of the many chemical or biochemical reactions brought about by ionizing radiation are responsible for initiating biological damage.Ionizing radiation is energy transmitted by X-rays, gamma rays, beta particles (high-speed electrons), alpha particles (the nucleus of the helium atom), neutrons, protons, and other heavy ions such as the nuclei of argon, nitrogen, carbon, and other elements. X-rays and gamma rays are electromagnetic waves like light, but their energy is much higher than that of light (their wavelengths are much shorter). Ultraviolet (UV) light is a radiation of intermediate energy that can damage cells like sunburns, but UV light differs from the forms of electromagnetic radiation mentioned above in that it does not cause ionization (loss of an electron) in atoms or molecules, but rather excitation (change in energy level of an electron). The other forms of radiation particles are either negatively charged (electrons), positively charged (protons, alpha rays, and other heavy ions), or electrically neutral (neutrons).[.].
Verlag: LAP LAMBERT Academic Publishing, 2017
ISBN 10: 3330335815ISBN 13: 9783330335813
Anbieter: moluna, Greven, Deutschland
Buch
Zustand: New.
Verlag: GRIN Verlag, 2015
ISBN 10: 3668043078ISBN 13: 9783668043077
Anbieter: AHA-BUCH GmbH, Einbeck, Deutschland
Buch
Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Doctoral Thesis / Dissertation from the year 2012 in the subject Chemistry - Bio-chemistry, , course: Biochemistry, language: English, abstract: Antioxidants are vital substances protecting cells from oxidative damage of biological molecules like DNA, proteins, lipids and maintain normal homeostasis in cell by scavenging free radicals. Oxidative stress is one of the major source of free radicals and causing disorders like multiple sclerosis, Alzheimer's, Parkinsons, cardiovascular diseases, and other degenerative disorders. Antioxidants finds application in medicine as they, act as immunoregulators, fight against ageing and also reported to induce apoptosis, cell cycle arrest against some cancer cell lines. Antioxidant also finds application in cosmetic industry and even as topical formulation. They are used as a preservative and also to increase the shelf life of frozen fish, canned mushrooms, meat, juice and general foods.Studies suggested that medicinal plants are a potential, inexpensive and safe source of antioxidants as they are enriched with bioactive compounds.Berberies aristata is commonly called as Daruhaldi or Chitra belongs to family Berberidaceae. The use of root extract as antipyretic, antiseptic, in the treatment of conjunctivitis, ulcers and hepatic disorders have been reported in earlier studies by various workers. The plant has been used for treatment of skin diseases, inflammation, diarrhoea and jaundice.Medicinal plants in the present study were screened for their antioxidant potential against different radicals like DPPH, superoxide, hydroxyl and peroxide. Among them ethanolic roots extract B.aristata exhibit highest antioxidant ability and least IC50 value.Thus further, the ethanolic root extract of B.aristata was subjected to activity guided isolation of antioxidants. Upon liquid-liquid fractionation ethyl acetate fraction exhibited highest radical scavenging activity against DPPH and peroxide radicals. In addition, the IC50 for DPPH radical scavenging and inhibition of lipid peroxidation were significantly less compared to crude ethanol extract indicating quality of antioxidants in ethyl acetate fraction.
Verlag: Edições Nosso Conhecimento, 2023
ISBN 10: 6206086356ISBN 13: 9786206086352
Anbieter: moluna, Greven, Deutschland
Buch
Zustand: New.
Verlag: Editions Notre Savoir, 2023
ISBN 10: 6206086321ISBN 13: 9786206086321
Anbieter: moluna, Greven, Deutschland
Buch
Zustand: New.
Verlag: Editions Notre Savoir, 2023
ISBN 10: 620608633XISBN 13: 9786206086338
Anbieter: moluna, Greven, Deutschland
Buch
Zustand: New.