1. Samples of a microbial colony obtained from the natural environment are not pure culture. They are mixed cultures because the environment consists of an array of microorganisms and not one specific organism. A sample obtained from the natural environment such as water or soil may contain several species of microbes that need to be further isolated to obtain a pure culture.
2. Isolation streak plate technique involves the dilution of the sample several folds and then streaking a small amount using a sterile inoculation loop on an agar plate in a zig-zag manner. This is done to obtain a pure culture of bacteria from a mixed population by separating the microprocessor. When the sample is diluted into a small concentration and is streaked onto agar placed, widely spaced, discrete colonies of bacteria can be observed. These isolated colonies can be further cultured to obtain pure cultures by picking and re-streaking them on fresh agar plates.
3. A microbial colony is considered a pure culture because it consists of single species. A single species of bacteria cluster and form an isolated colony on an agar plate which can be further plated on fresh medium.
3-1 - If your agar plate shows discrete uncluttered colonies then you have obtained an isolated colony. The following picture might help you to understand.
3-2. If you subculture isolated microbes into a sterile nutrient broth without any contamination, it will still be considered pure culture because it is single isolated species in a sterile aseptic environment of the nutrient broth.
3.3. A pure culture can become a mixed culture due to contamination. This could be caused by airborne bacteria if your conditions are not aseptic. Contamination is possible if the work area is not clean and sterile or if the glassware is not sterile. The contamination can transform your pure culture into a mixed culture and is hence problematic. So, it is very important to maintain a sterile and aseptic environment, glassware, and instruments.
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Answer:
hope this helps
Explanation:
The word harmony means a state of peaceful existence and agreement. To be an agreement among different kinds of people or things is harmony. Nepal is a common place of different kinds of people. There is mutual understanding, help and cooperation among them. So, the unity in diversity is the prime key to social harmony in Nepal.
Nepal is a multilingual, multicultural and multireligious and multiracial country. The people with distinct languages, races, cultures and religion inhabit in the same societies here. But there is no quarrel, fight, discrimination among them. They are living together from long time. The people who belong to various languages and races respect and love each other. Many languages are spoken in Nepal. The people have been divided into different castes and sub-castes. They own their unique languages being used by them for ages. There is no hatred between the races. The people speaking one language seem to be willing to learn other languages. Different castes and sub-castes own their unique cultures and follow different religious. The people who follow different cultures and religious do not possess hatred and hostility to other ones. Various festivals belonging to different cultures and religious are celebrated together. It ultimately fosters unity, fraternity, friendship, closeness respect and love among them.
We see or hear news of fight, murder and war in the name of religion and caste in the world but there is no such situation. Unity or national unity plays the prime role to develop the country. Social harmony strengthens national unity. Similarly, unity lessens hostility, hatred, conflict, mistrust, destruction and ruins; rather it consolidates co-operation, trust, brotherhood, friendship and so on. Social harmony builds up and boosts up the rights and freedom of the people. Social harmony in Nepal absolutely develops human prosperity and civilization.
Human is a social being by nature. Social harmony is a crucial element to introduce and maintain peace, freedom and justice in human society. A society with social harmony is a just or ideal Society. Inhumane and hostile activities may not exist in the society If the people are united with true spirit, love and brotherhood and social harmony.
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Answer:
just put down five explorers that you know
Explanation:
the rest is easy. your just overthinking it
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