20951. The viscosity of a fluid increases with increasing stirrer speed. This fluid would be best described as being
20952. A dilatant fluid is one in which the viscosity
20953. A rheopectic fluid is one in which the viscosity
20954. A fluid in which the viscosity increases with increasing stirrer speed and mixing time can be called as
20955. The medium will have the highest viscosity (considering that the cells do not secrete gums) with the presence of
20956. A Newtonian fluid is one in which the viscosity
20957. Which pattern of mixing is preferred in stirred tank reactors during the culture of aerobic microorganisms?
20958. Animal cell cultures do not have much effect on shear forces because
20959. The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity
20960. Pluronic F68 is added to cell culture media as
20961. A stirred tank reactor containing a fluid with a density of 2.5 g.ml-1 and viscosity of 0.002 kg m-1s-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
20962. If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is
20963. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
20964. A thixotropic fluid is one in which the viscosity
20965. Newtonian fluid is one in which the viscosity
20966. Reynolds number for laminar flow over a plate should be less than
20967. The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
20968. A Brookfield viscometer cannot determine the shear stress because
20969. Which of the following is correct?
20970. The Komologorov eddy size
20971. Pluronic F68 protects mammalian cells from damage stems as it is a/an
20972. Reynolds number for turbulent flow over a plate should be more than
20973. The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity
20974. Which of the following describes the detrimental effect of bubbles on animal cells?
20975. A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as
20976. Filamentous fungal cells are more shear sensitive than bacterial cells because of
20977. The viscosity of water at STP is approximately
20978. Alt+F4 is the short cut key used in windows for :
20979. The tear glands are called
20980. Which of the following statements about Aurangzeb is not correct ?
20981. Indian National Congress was organised in the year ————
20982. Which of the following type of osreads and react in terms of actual time?
20983. Which of the following is considered as a disadvantage to the adsorption method of immobilization?
20984. During the enzymatic reaction of an immobilized enzyme, the rate of substrate transfer is
20985. The immobilized technique involving chemical method is
20986. For a steady state condition, the change of substrate concentration (dCs/dt) is
20987. Damkohler number(NDa) is
20988. For glucose isomerization by immobilized enzyme, the reactor generally used is
20989. If Damkohler number, NDa >>1, the reaction rate is much greater than the mass transfer rate and the overall reaction is controlled by the rate of mass transfer. In this case, the enzyme reaction can be described as (where Csb and Cs are the substrate concentration in bulk of solution and at the immobilized enzyme surface respectively. ks mass transfer coefficient, and a is the surface area of an immobilized enzyme particles)
20990. The most commonly employed cross-linked polymer is the
20991. Which of the following is not the correct answer?
20992. Commonly employed water insoluble supports for the covalent attachment of enzyme include
20993. Which of the following is not a physical method of immobilization?
20994. The support material for immobilization of cells of Bacillus subtilis is
20995. The intraparticle mass transfer resistance can affect the rate of enzyme reaction, if enzymes are immobilized by
20996. The covalent attachment of enzyme molecules is via
20997. To measure the extent to which the reaction rate is lowered because of resistance to mass transfer, the effectiveness factor of an immobilized enzyme, η can be defined as
20998. Which is not the method for producing immobilized enzymes with multifunctional reagents?
20999. The immobilization technique involving physical method is
21000. Which of the following is the commonly employed adsorbents?
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