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Posted by Vidya Harikumar 5 years, 9 months ago
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Posted by Lavanya Gona 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Germ theory of disease is based on the concept that many diseases are caused by infections with microorganisms, typically only visualized under high magnification. Such microorganisms can consist of bacterial, viral, fungal, or protist species. Although the growth and productive replication of microorganisms are the cause of disease, environmental and genetic factors may predispose a host or influence the severity of the infection. For example, in a host that is immunocompromised (e.g., due to AIDS or old age), an infection may result in more severe outcomes than in individuals who are fully immunocompetent.
The notion that diseases could be spread by “seed-like entities” was first described in the 1500’s by Girolamo Fracastoro and were categorized based on how they could be transmitted. Later, Agostino Bassi in the early 1800’s conducted a series of experiments which demonstrated that a disease afflicting silkworms at the time was caused by a parasite. Bassi theorized that disease in humans and animals was also caused by microorganisms. Bassi’s work served to influence Louis Pasteur, who is accredited with the germ theory of disease following his experiments demonstrating the relationship between microorganisms and disease.
Posted by Lavanya Gona 5 years, 9 months ago
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Posted by Shivangi Yadav 5 years, 9 months ago
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Gaurav Seth 5 years, 9 months ago
Chlorination at C-2 and C-4 produces no chiral compound.
Hence (b) is the correct answer.
Posted by Shivangi Yadav 5 years, 9 months ago
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Gaurav Seth 5 years, 9 months ago
Among the following compounds, the most acidic is: [JEE-2011]
-
a)
p - nitrophenol
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b)
p - hydroxybenzoic acid
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c)
o - hydroxybenzoic acid
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d)
p - toluic acid
Correct answer is option 'C'.
Ortho-isomer, a strong hydrogen bridge can be formed between the phenolic -OH and the the carboxylate anion. This will tend to stabilize the conjugated carboxylate base, and hence will increase acidity.
this is the order of acidic
ortho hydroxy B.acid > meta hydroxy B.acid > benzoic acid > para hydroxy B. acids.
Posted by Tejaswini Shetty 5 years, 9 months ago
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Chhavi Singh 5 years, 8 months ago
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Rigved Tripathi 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Faraday’s constant is defined as the amount of charge required to liberate a gram equivalent of a substance during the process of electrolysis.
It is total charge on 1 mole of electrons. It is unit of charge.
1 F = 6.023 × 1023 × 1.6023 × 10-19 C = 96500 C
Posted by Ayush Dhinchak 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
- Force that resists motion of one body over another with which it is in contact.
- Denoted by fk
- As motion starts, fs vanishes and fk appears
- Kinetic friction is Independent of the area of contact and velocity of the body
- It varies with Normal reaction, N
fk ∝ N
fk = constant * N
fk = μk N; μk is the coefficient of kinetic friction
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Pulkit Bansal 5 years, 9 months ago
Ajeet Kumar 5 years, 9 months ago
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Rigved Tripathi 5 years, 9 months ago
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