Selecting University is a crucial step in the journey of Higher Studies. This post is mainly for those who will prefer to apply centrally for admission to US universities. But others can find the ways of selecting Universities useful too. The post is from a graduate student at the …
Read More »Monthly Archives: October 2020
Energy Environment: Global Radiation Balance & Energy Budget
Global Radiation Balance There are various factors that influence the amount of radiation coming from the sun to the earth’s surface. Some of the radiation is reflected upward, some is scattered both upward and downward directions. Besides, some of the radiation is absorbed by the clouds and atmosphere. The rest …
Read More »Arsenic: Exposure, Effect & Contamination
Arsenic is a naturally found chemical element whose atomic number is 33 with a symbol as ‘As’. It occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is one of the fundamental chemical element. It is a metalloid. Symbol: As …
Read More »Interrelationships of quantitative variables: Correlation and Regression
In the experiment, we measure the two continuous characters which are associated with each other. For example, the height of the plant and the temperature of the atmosphere. Accordingly, to understand the relationship between two such variables, we need to know how they are related and how the relationship can …
Read More »Analysis of Variance and F test
We can test the significance of the two sample means by using a t-test. However, in cases where there are more than two samples, it is done by Analysis of Variance (ANOVA). This method is carried out by comparing sample variances using Variance Ratio Test or F test. So at …
Read More »Toxic Substances & Environmental Health
Toxicity is the degree to which a substance can damage an organism. Toxicity can affect a whole organism, such as an animal, bacterium, or plant, as well as a cell (cytotoxicity) or an organ such as the liver (hepatotoxicity). Toxicity effects are dose-dependent; so, even water can lead to water …
Read More »Bacteria: Flagella
Flagella Most prokaryotes are motile by swimming, and this function is typically due to a structure called the flagellum. The plural form of this word is flagella which means whip. Bacterial flagellum is a threadlike locomotor appendages extending outgrowth from the plasma membrane and cell wall. Bacterial flagella are thin, …
Read More »Bacteria: Introduction and Size
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Read More »Fungi: A Kingdom of Achlorophyllous Eukaryotes
Fungi {sing. fungus (L.) = sphongos (Gr.) – sponge} are a kingdom of usually multicellular, eucaryotic, spore-producing, achlorophyllous organisms with absorptive nutrition that generally reproduce both sexually and asexually and whose usually filamentous, branched somatic structures, known as hyphae, typically are surrounded by cell walls. Currently, over 1.5 million species …
Read More »Importance of Fungi: Medicine, Agriculture & Industry
We usually think of fungi as organisms that cause diseases and rot food. But fungi are important to human life in many ways. The manifestations of this group of organisms have been known for thousands of years. Since the first toast was proposed over a shell full of wine and …
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