Bioactive natural

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  • The phenotypic changes in target cell induced by an exogenous agent, e.g. biologically active chemical, can be detected by labelling selected organelles with fluorescent dyes and observed under the high-throughput microscope. The changes of known biological targets (e.g. nucleus, proteins, mitochondria, microtubules, etc.)

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  • Marine fungi have become an important source of bioactive natural products. The present study was concerned with the screening of antimicrobial activity from 73 fungal strains isolated from various marine habitats collected from five different localities at the Son Tra Peninsula, Da Nang, Vietnam.

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  • Life on Earth is dependent on sunlight. In the process known as photosynthesis, plants, algae and certain bacterias are capable of using this source of energy to drive the synthesis of organic compounds. The oxygenic photosynthesis results in the release of molecular oxygen and the removal of carbon dioxide from the atmosphere that is used to synthesize carbohydrates.

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  • Pesticides are divided to insecticides, fungicides, herbicides, rodenticides, acaricides and nematocides according to the organisms that they affect. There are various forms of insecticides; most are repellants or insect growth regulators used in agriculture, public health, horticulture or food storage. It is evident that insecticides have been used to boost food production to a considerable extent and to control disease vectors.

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  • Mistletoe extracts have immunomodulatory activity. We show that nontoxic concentrations ofViscumalbumextracts increase natural killer (NK) cell-mediated killing of tumor cells but spare nontarget cells from NK lysis. The com-pounds responsible for this bioactivity were isolated from mistletoe and characterized. They have low molecular mass and are thermostable and protease-resistant.

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  • Knowledge about the forage yield potential and bioactive compound contents of Mediterranean natural populations of chicory is still scarce, even though it could be very helpful in view of the exploitation of the feeding value of local chicory germplasm for ruminants.

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  • B-Sitosterol, stigmasterol and a minor compound 5,6-dehydrokawain were isolated from the ethanol extract of the rhizomes of Alpinia globosa, a medicinal plant of Vietnam. The paper provides characteristic spectra and HPLC profile of the natural -pyrone 5,6- dehydrokawain that would be useful for the purpose of fast determination of this bioactive compound in plant extracts.

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  • In the search for bioactive constituents from Vietnamese plants, the leaves and stems of Callistemon citrinus (Curtis) Skeels were selected for chemical investigation. Phytochemical analysis of plant led to the isolation of eight phenolic compounds including two flavonoids (eucalyptine (1) and 8-demethyleucalyptine (2)), two alcohols (blumenol A (3), ntetratriacontanol (4)), three benzoic acid derivatives (acid gallic (5), methyl gallate (6) protocatechuic acid (7)), one sterol (β-sitosterol (8)), and along with one sesquiterpene (2,6,10- bisabolatriene (9)).

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  • Natural bioactive compounds have been found superior to chemical compounds for use in pharmaceutical applications. Such natural compounds include biologically active compounds present as a part of fungal metabolism that originate through different biochemical pathways and contain different structural groups like benzopyranones, phenols, toxins, and steroids.

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  • Propolis is a natural, resinous, hive product with various bioactive properties. Polymorphonuclear leukocytes (PMNLs) use both oxygen-dependent (respiratory burst) and oxygen-independent mechanisms (releasing proteolytic enzymes such as elastase) to destroy infectious agents.

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