Since their discovery in the s, they have become increasingly important in human health, agriculture as well as in biological sciences among others. The spore produced is referred to as conidium. General Characteristics of Aspergillus Aspergilli can be found throughout nature with their spores being abundant in air. In addition to largely being saprophytes that obtain their nutrition from dead and decaying matter, they can also be pathogenic to human beings and animals with some also affecting and damaging plants.
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Since their discovery in the s, they have become increasingly important in human health, agriculture as well as in biological sciences among others. The spore produced is referred to as conidium. General Characteristics of Aspergillus Aspergilli can be found throughout nature with their spores being abundant in air.
In addition to largely being saprophytes that obtain their nutrition from dead and decaying matter, they can also be pathogenic to human beings and animals with some also affecting and damaging plants. Because they lack chlorophyll , and are therefore unable to produce their own food, they are dependent on other material in their surroundings for nutrition.
Here, it is worth noting that Aspergilli are incapable of absorbing organic matter in their surroundings. For this reason, they release different types of enzymes such as amylase capable of breaking down these materials into simpler compounds that can be absorbed through the vegetative hyphae. The release of high amounts of these enzymes results in enhanced decay of all organic matter in their immediate environment and consequently the availability of more food source necessary for reproduction and growth.
For most part, they reproduce asexually through the production of spores known as conidium fungi spore. Once the spore lands on a favorable environment with moisture, warmth and nutrients they start germinating where they create numerous hyphae that form the mycelium.
The hyphae allows them to grow, spread and continue reproducing across the surface of the substrate. The vegetative hyphae serves to absorb nutrients while the reproductive hyphae develop further to produce spores. Types of Aspergillus There are several types of species that fall under the genus Aspergillus. The following are some of the most common fungi that belong to this genus: Aspergillus Niger Aspergillus Niger - CDC photo credit: Ginger Chew, ScD Aspergillus niger largely exist as saprophytes, which means that they obtain their nutrition from a variety of dead and decaying material such as leaves, fruits and other vegetation.
As such, they also contribute to the delay of various food products. However, they are known to be particularly prevalent in areas with higher temperatures. Morphology of Aspergillus Niger Like others, Aspergillus niger are filamentous fungi, which means that they tend to form filaments hyphae and thus resemble the structure of a plant.
When viewed under the microscope, A. A closer look will reveal the conidial heads of the organism to be globose and dark brown in color that have been shown to divide into a number of columns as the A.
Compared to the other types, A. This is a characteristic that has only been seen on A. Reproduction Aspergillus niger is an ascomycetous fungus. This means that it is classified under the phylum Ascomycota, also commonly referred to as Sac Fungi. As such, spores are produced within the sacs Asci asexually. Like Aspergillus nidulans, colonies of A. Whereas the vegetative hyphae absorb nutrients from the dead and decaying matter, the spores conidium are produced from the tip of the reproductive hyphae that looks like a vesicle.
In particular, A. This strain has been shown to produce a consistently high content of aflatoxin that affects crops and animals alike.
Jamur Aspergillus Flavus
Morphological Description: Colonies are usually fast growing, white, yellow, yellow-brown, brown to black or shades of green, mostly consisting of a dense felt of erect conidiophores. Conidiophores terminate in a vesicle covered with either a single palisade-like layer of phialides uniseriate or a layer of subtending cells metulae which bear small whorls of phialides the biseriate structure. The vesicle, phialides, metulae if present and conidia form the conidial head. Conidia are one-celled, smooth or rough-walled, hyaline or pigmented, are produced in long dry chains which may be divergent radiate or aggregated in compact columns columnar.
KARAKTERISTIK ASPERGILLUS FLAVUS PDF
Lesi utama aspergillosis dapat berbentuk macula, papul, nodul, ataupun plak sedangkan bentuk pustule ataupun lesi yang disertai dengan purulen discharge sering dijumpai pada neonatus cutaneous aspergillosis. Lesi biasanya nyeri tetapi dapat juga asimtomatik. Manifestasi ini mengalami perubahan secara cepat menjadi pustule, vesikel yang hemoragik dan selanjutnya akan terbentuk krusta yang tertutup keropeng hitam Diba et. Populasi jamur pada produk kakao segar asal Indonesia berkisar 2,3 x — 7,2 x CFU. Perlakuan klorin mempengaruhi diversitas jamur yang diisolasi, juga frekuensi isolasinya pada produk kakao.
Aspergillus fumigatus adalah jamur yang termasuk dalam kelas Ascomycetes yang mudah diisolasi dari lingkungan udara. Jamur ini dapat ditemukan di mana-mana pada tumbuh-tumbuhan yang telah membusuk. Jawetz, 2. Aspergillus fumigatus membentuk koloni berwarna hijau berkabut dengan tekstur seperti beludru. Gambaran mikroskopis.