Nutrient medium is to be heated from 10⁰C to 28⁰C is a single-pass countercurrent shell-and-tube heat exchanger before being pumped into a fed-batch fermenter. Medium passes through the tubes of the exchanger; the shell-side fluid is water which enters with flow rate 3 x 10^4 kg h^- 1 and temperature 60⁰C pre-heated medium is required at a rate of 50 m^3 h^-1. The density, viscosity and heat capacity of the medium are the same as water; the thermal conductivity of the medium is 0.54 Wm^- 1 ⁰C ^- 1. It is proposed to use 30 steel tubes with inner diameter 5 cm; the tubes will be arranged in line. The pipe wall is 5-mm thick; the thermal conductivity of the metal is 50 Wm^- 1 ⁰C^ - 1. The maximum linear shell-side fluid velocity is estimated as 0.15 m s^-1. What tube length is required? ____________

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#Question id: 19144

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

As the E value of a BLAST search becomes smaller 

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#Question id: 17920

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

C in CATH database stands for

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#Question id: 1144

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following is NOT a common intracellular second messenger?

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#Question id: 10127

#Section 2: General Biology

In higher plants, the multi-subunit protein supercomplex has two complete reaction centers and some antenna complexes. The core of the reaction center consists of two membrane proteins known as D1 and D2, Which contained a multi-subunit protein supercomplexes;

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#Question id: 5260

#Section 3: Genetics, Cellular and Molecular Biology

Regarding prokaryotic reproduction, which statement is correct?