This document discusses upgrading exoglucanase production by Trichoderma reesei NRC 210 through fermentation process optimization. Batch fermentations were performed to study the effects of pH and agitation speed on enzyme production. Results showed that controlling pH from 4-5 and increasing agitation speed to 350 rpm increased exoglucanase activity by about 15-fold and 1.8-fold, respectively. Kinetic models including the Leudeking-Piret and Monod models were applied and showed good fit to experimental data, indicating growth-associated exoglucanase production and substrate consumption patterns over fermentation time. Process optimization led to improved exoglucanase yields useful for industrial applications.
Scale up means increasing the quantity or volume of cell culture. For animal cells, the scale up strategies are dependent upon cell types or i.e. whether the cells requires matrix for attachment and growth ( adherent cell culture) or grows freely in suspended form in aqueous media. The scaling up principle for adherent cells are just to increase surface area for attachment while for suspension culture is to increase culture volume. This presentation enlightens the reader about different methods of scaling up of cells culture. Readers are also provided with sample questions for better understanding
Immobilization of enzymes refers to the technique of confining/anchoring the enzymes in or on an inert support for their stability & functional reuse.
this slide is about the two most vastly used reactors i.e., batch and continuous.
Downstream processing refers to the recovery and purification of biosynthetic products, particularly pharmaceuticals, from natural sources such as animal or plant tissue or fermentation broth, including the recycling of salvageable components and the proper treatment and disposal of waste.
Scale up means increasing the quantity or volume of cell culture. For animal cells, the scale up strategies are dependent upon cell types or i.e. whether the cells requires matrix for attachment and growth ( adherent cell culture) or grows freely in suspended form in aqueous media. The scaling up principle for adherent cells are just to increase surface area for attachment while for suspension culture is to increase culture volume. This presentation enlightens the reader about different methods of scaling up of cells culture. Readers are also provided with sample questions for better understanding
Immobilization of enzymes refers to the technique of confining/anchoring the enzymes in or on an inert support for their stability & functional reuse.
this slide is about the two most vastly used reactors i.e., batch and continuous.
Downstream processing refers to the recovery and purification of biosynthetic products, particularly pharmaceuticals, from natural sources such as animal or plant tissue or fermentation broth, including the recycling of salvageable components and the proper treatment and disposal of waste.
Batch and Continuous Sterilization of Media in Fermentation Industry Dr. Pavan Kundur
Continuous sterilization is the rapid transfer of heat to medium through steam condensate without the use of a heat exchanger. ... This is more efficient than batch sterilization because instead of expending energy to heat, hold, and cool the entire system, small portions of the inlet streams are heated at a time.
Process scale-up is a critical activity that enables a fermentation process achieved in research and development to operate at a commercially viable scale for manufacturing.
Batch and Continuous Sterilization of Media in Fermentation Industry Dr. Pavan Kundur
Continuous sterilization is the rapid transfer of heat to medium through steam condensate without the use of a heat exchanger. ... This is more efficient than batch sterilization because instead of expending energy to heat, hold, and cool the entire system, small portions of the inlet streams are heated at a time.
Process scale-up is a critical activity that enables a fermentation process achieved in research and development to operate at a commercially viable scale for manufacturing.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Study on Culture Conditions for A Cellulase Production From As Pergillus UnguisIJMERJOURNAL
ABSTRACT: Cellulase is a common name of enzymes which catalyze cellulolysis. Specially,cellulase is widely used in food processing, animal feed, chemicals, textile,fuel and pollution treatment.The objective of this research is to study on optimal conditions for the production of cellulase byAspergillus unguis. The study was designed as a comparative culture conditions such as carbon sources, moisture content, duration, nitrogen sources and citrate buffer content on cellulase production for Aspergillus unguis. Cellulase activity was determined by measuring the absorbance at λ = 540 nm with 3,5-DNS reagent. In optimized culture conditions, enzyme activity of Aspergillus unguis achieved 110.92U/ml in comparison with a commercial cellulase with 185.33U/ml in enzyme activity. The value of cellulase activity of Aspergillus unguis is 41% lower than commercial enzymes. However, enzyme in this study was raw enzyme and the cost of producing1 litter of this enzyme is just 1/8 that of purified ones. The enzyme activity would be increased by purification. That fact has proven the applicability of using the findings of this study to improve cellulase production.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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The Role of Cell Wall-Degrading Enzymes in the Development of Anthracnose Dis...Agriculture Journal IJOEAR
— The ability of Colletotrichumtruncatum CP2 in producing pectinolytic and cellulolytic enzymes was evaluated by shake flask fermentations. The results of enzymatic activity experiment indicated that PG was the first cell wall-degrading enzymes detected and the activities obtained were higher (0.24±0.10 U/mL) than other enzymes, which appeared later and in lower amount. After the cell wall was degraded by the action of PG, further degradation of the cell wall was affected by pectin methylesterases, pectin lyase, pectate lyase and cellulases. The disparity in enzymatic activity at different intervals may suggest their specific role for pathogenesis at proper timings.
Immobilization of two endoglucanases from different sourcesIJEAB
Cellulases are a important family of hydrolytic enzymes which catalyze the bond of cellulose and other related cello-oligosaccharide derivates. Industrial applications require enzymes highly stable and economically viable in terms of reusability. These costs can be reduced by immobilizing the cellulases, offering a potential solution through enzyme recycling and easy recovery. The covalent immobilization of enzymes is reported here: one is commercial cellulase from Aspergillus niger and other one is recombinant enzyme, named CelStrep it because was isolated from a new cellulolytic strain, Streptomyces sp. G12,. The optimal pH for binding is 4.6 for both cellulases and the optimal enzyme concentrations are 1 mg/mL and 5 mg/mL respectively. The support for immobilization is a poliacrylic matrix. Experiments carried out in this work show positive results of enzyme immobilization in terms of efficiency and stability and confirm the economic and biotechnical advantages of enzyme immobilization for a wide range of industrial applications.
Advantages of microbial biotransformation of bioactive compounds & microbial ...Radwa Ahmed
advantages of the use of microbial biotransformation in the field of natural products.
The microbial models for mammalian drug metabolism and applications in drug studies
Bioprocess development for enhanced spore production in shake flask and pilot...iosrjce
Bacillus thuringiensis subsp. Israelensis (Bti), has proven to be a safe and effective larvicide for controlling
mosquito and black fly larvae. The effect of cultivation and bioprocess development on Bti growth and sporulation was
investigated in shake flask level and batch cultivation in the semi-industrial scale 16-L stirred tank bioreactor. For
industrial production of biocontrol microorganism, it is necessary to obtain high cell mass and spore production in a short
time with low cost cultivation media. In this study, the new composition of production media was optimized which composed
of (g L
-1
): glucose, 10; yeast extract, 30; KH2PO4, 5; K2HPO4, 5; MgSO4. 7H20, 0.005; MnSO4.H2O, 0.03; FeSO4, 0.01;
CaCl2.7 H2O, 0.05; NaH2PO4, 1.5; NH4H2PO4, 1.5. The maximal cell dry mass and spore production, Sporemax for shake
flask study were 4.26 gL-1
at 36 h and 3.29106
spore mL-1
, respectively. Furthermore, studies of the cultivation conditions
under controlled and uncontrolled pH in the 16L-bioreactor was performed. The growth of Bti under uncontrolled pH
cultivation showing decreased of glucose and total protein concentration in the media was correlated with the vegetative cell
growth and sporulation. The maximal cell dry mass and Sporemax for uncontrolled pH bioreactor were 4.14 gL-1
at 36h and
3.7106
spore mL-1
, respectively. The maximal cell dry mass and spore production, Sporemax for controlled pH bioreactor
were 3.36 gL-1
at 26 h and 3.23 106
spore mL-1
, respectively. In conclusion, batch cultivation in 16-L bioreactor with the
new optimized production medium under uncontrolled pH condition increased of the cell dry mass and number of spores up to 23 % and 47 % , respectively
Effect of Different Physico-Chemical Parameters on Production ofAmylase by Ba...IOSR Journals
The present study is concerned with the production of amylase by Bacillus species strain. In this
study 12 bacterial strains were isolated and screened for their α-amylase activity. These strains were
maintained on nutrient agar medium. Fermentation for the production of amylase was carried out in the enzyme
production medium (EPM). All the 12 strains were tested for amylase production. On the basis of maximum
amylase activity strain no.1 was selected for further studies. Different starch concentrations, 0.75,1.00,1.25%,
pH labels 6.5,7.0,7.5,8.0, aeration (RPM), 100,120,140, temperatures 250C,280C,370C, and 400C and inoculums
level 0.5%,1.0%, 1.5% and 2.0% were studied
CULTIVATION OF OSCILLATORIA SP IN DAIRY WASTE WATER IN TWO STAGE PHOTO BIOREA...civej
This paper presents an integrated approach to cultivate microalgae in dairy wastewater and to
investigate the capability of the organism for biodiesel production. The present study was carried out
using tolerant strains of microalgae collected from dairy effluent treatment plant, Kochi. Selected blue
green algal strains were mass cultured in the laboratory and acclimatized using different concentrations
of synthetic effluent. Blue green algal filaments were immobilized inside the primary and secondary
photobioreactors. The experiment was conducted in two stages including batch and continuous
treatment. The stage 1 of the experiment was designed for the reduction of physical impurities and the
nutrients. Stage 2 was designed mainly for the cultivation of blue green algae in dairy waste water by
utilizing the extra nutrients . Reduction of 94 -99.5% in phosphate was observed after 48 h of treatment
in the primary and secondary photobioreactors. The level of phosphate, total hardness, ammoniacal
nitrogen in the MSE was reduced by 97%,93 %, 81% respectively. BOD was reduced to 370mg L-1 from
1500 mg L-1 after 48 hrs of treatment in the primary reactor. COD was reduced to 85 mg L -1 from an
initial value of 1500 mg L -1 from medium strength effluent (MSE) and 90-95 % removal of COD was
also obtained from high strength effluent(HSE) during the study period. Biomass developed within the
reactor was harvested at every 15 days intervals from the secondary reactor and analyzed for lipids and
fattyacids. Presence of C14:0, C16:0,C18:0, C18:1 and C18:2 fatty acids strongly supports its abilility for
biodiesel production.
A Novel Method for Prevention of Bandwidth Distributed Denial of Service AttacksIJERD Editor
Distributed Denial of Service (DDoS) Attacks became a massive threat to the Internet. Traditional
Architecture of internet is vulnerable to the attacks like DDoS. Attacker primarily acquire his army of Zombies,
then that army will be instructed by the Attacker that when to start an attack and on whom the attack should be
done. In this paper, different techniques which are used to perform DDoS Attacks, Tools that were used to
perform Attacks and Countermeasures in order to detect the attackers and eliminate the Bandwidth Distributed
Denial of Service attacks (B-DDoS) are reviewed. DDoS Attacks were done by using various Flooding
techniques which are used in DDoS attack.
The main purpose of this paper is to design an architecture which can reduce the Bandwidth
Distributed Denial of service Attack and make the victim site or server available for the normal users by
eliminating the zombie machines. Our Primary focus of this paper is to dispute how normal machines are
turning into zombies (Bots), how attack is been initiated, DDoS attack procedure and how an organization can
save their server from being a DDoS victim. In order to present this we implemented a simulated environment
with Cisco switches, Routers, Firewall, some virtual machines and some Attack tools to display a real DDoS
attack. By using Time scheduling, Resource Limiting, System log, Access Control List and some Modular
policy Framework we stopped the attack and identified the Attacker (Bot) machines
Hearing loss is one of the most common human impairments. It is estimated that by year 2015 more
than 700 million people will suffer mild deafness. Most can be helped by hearing aid devices depending on the
severity of their hearing loss. This paper describes the implementation and characterization details of a dual
channel transmitter front end (TFE) for digital hearing aid (DHA) applications that use novel micro
electromechanical- systems (MEMS) audio transducers and ultra-low power-scalable analog-to-digital
converters (ADCs), which enable a very-low form factor, energy-efficient implementation for next-generation
DHA. The contribution of the design is the implementation of the dual channel MEMS microphones and powerscalable
ADC system.
Influence of tensile behaviour of slab on the structural Behaviour of shear c...IJERD Editor
-A composite beam is composed of a steel beam and a slab connected by means of shear connectors
like studs installed on the top flange of the steel beam to form a structure behaving monolithically. This study
analyzes the effects of the tensile behavior of the slab on the structural behavior of the shear connection like slip
stiffness and maximum shear force in composite beams subjected to hogging moment. The results show that the
shear studs located in the crack-concentration zones due to large hogging moments sustain significantly smaller
shear force and slip stiffness than the other zones. Moreover, the reduction of the slip stiffness in the shear
connection appears also to be closely related to the change in the tensile strain of rebar according to the increase
of the load. Further experimental and analytical studies shall be conducted considering variables such as the
reinforcement ratio and the arrangement of shear connectors to achieve efficient design of the shear connection
in composite beams subjected to hogging moment.
Gold prospecting using Remote Sensing ‘A case study of Sudan’IJERD Editor
Gold has been extracted from northeast Africa for more than 5000 years, and this may be the first
place where the metal was extracted. The Arabian-Nubian Shield (ANS) is an exposure of Precambrian
crystalline rocks on the flanks of the Red Sea. The crystalline rocks are mostly Neoproterozoic in age. ANS
includes the nations of Israel, Jordan. Egypt, Saudi Arabia, Sudan, Eritrea, Ethiopia, Yemen, and Somalia.
Arabian Nubian Shield Consists of juvenile continental crest that formed between 900 550 Ma, when intra
oceanic arc welded together along ophiolite decorated arc. Primary Au mineralization probably developed in
association with the growth of intra oceanic arc and evolution of back arc. Multiple episodes of deformation
have obscured the primary metallogenic setting, but at least some of the deposits preserve evidence that they
originate as sea floor massive sulphide deposits.
The Red Sea Hills Region is a vast span of rugged, harsh and inhospitable sector of the Earth with
inimical moon-like terrain, nevertheless since ancient times it is famed to be an abode of gold and was a major
source of wealth for the Pharaohs of ancient Egypt. The Pharaohs old workings have been periodically
rediscovered through time. Recent endeavours by the Geological Research Authority of Sudan led to the
discovery of a score of occurrences with gold and massive sulphide mineralizations. In the nineties of the
previous century the Geological Research Authority of Sudan (GRAS) in cooperation with BRGM utilized
satellite data of Landsat TM using spectral ratio technique to map possible mineralized zones in the Red Sea
Hills of Sudan. The outcome of the study mapped a gossan type gold mineralization. Band ratio technique was
applied to Arbaat area and a signature of alteration zone was detected. The alteration zones are commonly
associated with mineralization. The alteration zones are commonly associated with mineralization. A filed check
confirmed the existence of stock work of gold bearing quartz in the alteration zone. Another type of gold
mineralization that was discovered using remote sensing is the gold associated with metachert in the Atmur
Desert.
Reducing Corrosion Rate by Welding DesignIJERD Editor
The paper addresses the importance of welding design to prevent corrosion at steel. Welding is
used to join pipe, profiles at bridges, spindle, and a lot more part of engineering construction. The
problems happened associated with welding are common issues in these fields, especially corrosion.
Corrosion can be reduced with many methods, they are painting, controlling humidity, and also good
welding design. In the research, it can be found that reducing residual stress on the welding can be
solved in corrosion rate reduction problem.
Preheating on 500oC and 600oC give better condition to reduce corosion rate than condition after
preheating 400oC. For all welding groove type, material with 500oC and 600oC preheating after 14 days
corrosion test is 0,5%-0,69% lost. Material with 400oC preheating after 14 days corrosion test is 0,57%-0,76%
lost.
Welding groove also influence corrosion rate. X and V type welding groove give better condition to reduce
corrosion rate than use 1/2V and 1/2 X welding groove. After 14 days corrosion test, the samples with
X welding groove type is 0,5%-0,57% lost. The samples with V welding groove after 14 days corrosion test is
0,51%-0,59% lost. The samples with 1/2V and 1/2X welding groove after 14 days corrosion test is 0,58%-
0,71% lost.
Router 1X3 – RTL Design and VerificationIJERD Editor
Routing is the process of moving a packet of data from source to destination and enables messages
to pass from one computer to another and eventually reach the target machine. A router is a networking device
that forwards data packets between computer networks. It is connected to two or more data lines from different
networks (as opposed to a network switch, which connects data lines from one single network). This paper,
mainly emphasizes upon the study of router device, it‟s top level architecture, and how various sub-modules of
router i.e. Register, FIFO, FSM and Synchronizer are synthesized, and simulated and finally connected to its top
module.
Active Power Exchange in Distributed Power-Flow Controller (DPFC) At Third Ha...IJERD Editor
This paper presents a component within the flexible ac-transmission system (FACTS) family, called
distributed power-flow controller (DPFC). The DPFC is derived from the unified power-flow controller (UPFC)
with an eliminated common dc link. The DPFC has the same control capabilities as the UPFC, which comprise
the adjustment of the line impedance, the transmission angle, and the bus voltage. The active power exchange
between the shunt and series converters, which is through the common dc link in the UPFC, is now through the
transmission lines at the third-harmonic frequency. DPFC multiple small-size single-phase converters which
reduces the cost of equipment, no voltage isolation between phases, increases redundancy and there by
reliability increases. The principle and analysis of the DPFC are presented in this paper and the corresponding
simulation results that are carried out on a scaled prototype are also shown.
Mitigation of Voltage Sag/Swell with Fuzzy Control Reduced Rating DVRIJERD Editor
Power quality has been an issue that is becoming increasingly pivotal in industrial electricity
consumers point of view in recent times. Modern industries employ Sensitive power electronic equipments,
control devices and non-linear loads as part of automated processes to increase energy efficiency and
productivity. Voltage disturbances are the most common power quality problem due to this the use of a large
numbers of sophisticated and sensitive electronic equipment in industrial systems is increased. This paper
discusses the design and simulation of dynamic voltage restorer for improvement of power quality and
reduce the harmonics distortion of sensitive loads. Power quality problem is occurring at non-standard
voltage, current and frequency. Electronic devices are very sensitive loads. In power system voltage sag,
swell, flicker and harmonics are some of the problem to the sensitive load. The compensation capability
of a DVR depends primarily on the maximum voltage injection ability and the amount of stored
energy available within the restorer. This device is connected in series with the distribution feeder at
medium voltage. A fuzzy logic control is used to produce the gate pulses for control circuit of DVR and the
circuit is simulated by using MATLAB/SIMULINK software.
Study on the Fused Deposition Modelling In Additive ManufacturingIJERD Editor
Additive manufacturing process, also popularly known as 3-D printing, is a process where a product
is created in a succession of layers. It is based on a novel materials incremental manufacturing philosophy.
Unlike conventional manufacturing processes where material is removed from a given work price to derive the
final shape of a product, 3-D printing develops the product from scratch thus obviating the necessity to cut away
materials. This prevents wastage of raw materials. Commonly used raw materials for the process are ABS
plastic, PLA and nylon. Recently the use of gold, bronze and wood has also been implemented. The complexity
factor of this process is 0% as in any object of any shape and size can be manufactured.
Spyware triggering system by particular string valueIJERD Editor
This computer programme can be used for good and bad purpose in hacking or in any general
purpose. We can say it is next step for hacking techniques such as keylogger and spyware. Once in this system if
user or hacker store particular string as a input after that software continually compare typing activity of user
with that stored string and if it is match then launch spyware programme.
A Blind Steganalysis on JPEG Gray Level Image Based on Statistical Features a...IJERD Editor
This paper presents a blind steganalysis technique to effectively attack the JPEG steganographic
schemes i.e. Jsteg, F5, Outguess and DWT Based. The proposed method exploits the correlations between
block-DCTcoefficients from intra-block and inter-block relation and the statistical moments of characteristic
functions of the test image is selected as features. The features are extracted from the BDCT JPEG 2-array.
Support Vector Machine with cross-validation is implemented for the classification.The proposed scheme gives
improved outcome in attacking.
Secure Image Transmission for Cloud Storage System Using Hybrid SchemeIJERD Editor
- Data over the cloud is transferred or transmitted between servers and users. Privacy of that
data is very important as it belongs to personal information. If data get hacked by the hacker, can be
used to defame a person’s social data. Sometimes delay are held during data transmission. i.e. Mobile
communication, bandwidth is low. Hence compression algorithms are proposed for fast and efficient
transmission, encryption is used for security purposes and blurring is used by providing additional
layers of security. These algorithms are hybridized for having a robust and efficient security and
transmission over cloud storage system.
Application of Buckley-Leverett Equation in Modeling the Radius of Invasion i...IJERD Editor
A thorough review of existing literature indicates that the Buckley-Leverett equation only analyzes
waterflood practices directly without any adjustments on real reservoir scenarios. By doing so, quite a number
of errors are introduced into these analyses. Also, for most waterflood scenarios, a radial investigation is more
appropriate than a simplified linear system. This study investigates the adoption of the Buckley-Leverett
equation to estimate the radius invasion of the displacing fluid during waterflooding. The model is also adopted
for a Microbial flood and a comparative analysis is conducted for both waterflooding and microbial flooding.
Results shown from the analysis doesn’t only records a success in determining the radial distance of the leading
edge of water during the flooding process, but also gives a clearer understanding of the applicability of
microbes to enhance oil production through in-situ production of bio-products like bio surfactans, biogenic
gases, bio acids etc.
Gesture Gaming on the World Wide Web Using an Ordinary Web CameraIJERD Editor
- Gesture gaming is a method by which users having a laptop/pc/x-box play games using natural or
bodily gestures. This paper presents a way of playing free flash games on the internet using an ordinary webcam
with the help of open source technologies. Emphasis in human activity recognition is given on the pose
estimation and the consistency in the pose of the player. These are estimated with the help of an ordinary web
camera having different resolutions from VGA to 20mps. Our work involved giving a 10 second documentary to
the user on how to play a particular game using gestures and what are the various kinds of gestures that can be
performed in front of the system. The initial inputs of the RGB values for the gesture component is obtained by
instructing the user to place his component in a red box in about 10 seconds after the short documentary before
the game is finished. Later the system opens the concerned game on the internet on popular flash game sites like
miniclip, games arcade, GameStop etc and loads the game clicking at various places and brings the state to a
place where the user is to perform only gestures to start playing the game. At any point of time the user can call
off the game by hitting the esc key and the program will release all of the controls and return to the desktop. It
was noted that the results obtained using an ordinary webcam matched that of the Kinect and the users could
relive the gaming experience of the free flash games on the net. Therefore effective in game advertising could
also be achieved thus resulting in a disruptive growth to the advertising firms.
Hardware Analysis of Resonant Frequency Converter Using Isolated Circuits And...IJERD Editor
-LLC resonant frequency converter is basically a combo of series as well as parallel resonant ckt. For
LCC resonant converter it is associated with a disadvantage that, though it has two resonant frequencies, the
lower resonant frequency is in ZCS region[5]. For this application, we are not able to design the converter
working at this resonant frequency. LLC resonant converter existed for a very long time but because of
unknown characteristic of this converter it was used as a series resonant converter with basically a passive
(resistive) load. . Here, it was designed to operate in switching frequency higher than resonant frequency of the
series resonant tank of Lr and Cr converter acts very similar to Series Resonant Converter. The benefit of LLC
resonant converter is narrow switching frequency range with light load[6] . Basically, the control ckt plays a
very imp. role and hence 555 Timer used here provides a perfect square wave as the control ckt provides no
slew rate which makes the square wave really strong and impenetrable. The dead band circuit provides the
exclusive dead band in micro seconds so as to avoid the simultaneous firing of two pairs of IGBT’s where one
pair switches off and the other on for a slightest period of time. Hence, the isolator ckt here is associated with
each and every ckt used because it acts as a driver and an isolation to each of the IGBT is provided with one
exclusive transformer supply[3]. The IGBT’s are fired using the appropriate signal using the previous boards
and hence at last a high frequency rectifier ckt with a filtering capacitor is used to get an exact dc
waveform .The basic goal of this particular analysis is to observe the wave forms and characteristics of
converters with differently positioned passive elements in the form of tank circuits.
Simulated Analysis of Resonant Frequency Converter Using Different Tank Circu...IJERD Editor
LLC resonant frequency converter is basically a combo of series as well as parallel resonant ckt. For
LCC resonant converter it is associated with a disadvantage that, though it has two resonant frequencies, the
lower resonant frequency is in ZCS region [5]. For this application, we are not able to design the converter
working at this resonant frequency. LLC resonant converter existed for a very long time but because of
unknown characteristic of this converter it was used as a series resonant converter with basically a passive
(resistive) load. . Here, it was designed to operate in switching frequency higher than resonant frequency of the
series resonant tank of Lr and Cr converter acts very similar to Series Resonant Converter. The benefit of LLC
resonant converter is narrow switching frequency range with light load[6] . Basically, the control ckt plays a
very imp. role and hence 555 Timer used here provides a perfect square wave as the control ckt provides no
slew rate which makes the square wave really strong and impenetrable. The dead band circuit provides the
exclusive dead band in micro seconds so as to avoid the simultaneous firing of two pairs of IGBT’s where one
pair switches off and the other on for a slightest period of time. Hence, the isolator ckt here is associated with
each and every ckt used because it acts as a driver and an isolation to each of the IGBT is provided with one
exclusive transformer supply[3]. The IGBT’s are fired using the appropriate signal using the previous boards
and hence at last a high frequency rectifier ckt with a filtering capacitor is used to get an exact dc
waveform .The basic goal of this particular analysis is to observe the wave forms and characteristics of
converters with differently positioned passive elements in the form of tank circuits. The supported simulation
is done through PSIM 6.0 software tool
Amateurs Radio operator, also known as HAM communicates with other HAMs through Radio
waves. Wireless communication in which Moon is used as natural satellite is called Moon-bounce or EME
(Earth -Moon-Earth) technique. Long distance communication (DXing) using Very High Frequency (VHF)
operated amateur HAM radio was difficult. Even with the modest setup having good transceiver, power
amplifier and high gain antenna with high directivity, VHF DXing is possible. Generally 2X11 YAGI antenna
along with rotor to set horizontal and vertical angle is used. Moon tracking software gives exact location,
visibility of Moon at both the stations and other vital data to acquire real time position of moon.
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giga bytes and tera bytes in size. The proposed tool “MS-Extractor: An Innovative Approach to extract
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data sets of human genome „Y‟. The proposed system uses string matching with sliding window approach to
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1. International Journal of Engineering Research and Development
e-ISSN: 2278-067X, p-ISSN: 2278-800X, www.ijerd.com
Volume 10, Issue 8 (August 2014), PP.68-73
Upgrading of Exoglucanase Production By Trichoderma reesei
NRC 210
Elshafei A. M.1 Hussein F.2 El-Mahalawy A.3 Kahil T.1
Mostafa Enas M.2* Abd-Eltawab B.1*
Microbial Chemistry Dept., National research center, Dokki, Cairo, Egypt 1
Chemical Engineering and Pilot Plant Department, National Research Centre. Dokki, Cairo, Egypt2
Microbiology Dept., Faculty of science, Ain shams university, Cairo, Egypt 3
Biotechnology and Genetic Engineering Unit., National Research Centre, Dokki, Cairo, Egypt*
Abstract:- Cellulases find extensive applications in food, fermentation, textile industries and the hydrolysis of
cellulosic wastes to useable carbon source for most of the microbes in food, fuel and chemical production.
Trichoderma reesei is an efficient producer of exoglucanase enzyme. Physiological factors affecting the
production of enzyme were studied in shake flask to obtain the optimum parameters for enzyme production.
Batch fermentations were performed in 7 liter fermentor using an initial cellulose concentration corresponding
to 10g/l. Results obtained indicate that adjusting the fermentation process at a pH range of 4-5 and agitation
speed to 350 rpm resulted to an increase in enzyme activity about 15 folds and 1.8 fold respectively. In addition
Monod growth kinetics and Leudeking Piret product formation kinetics were studied using Trichoderma reesei
with best medium under optimized conditions of inoculum concentration, agitator speed, temperature and pH
value.
Keywords:- Trichoderma reesei, Cellulase, Exoglucanase, Fermentation, Fed batch, Modeling.
I. INTRODUCTION
Cellulase is an important and essential kind of enzyme for carrying out the depolymerization of
cellulose into fermentable sugars. As a major resource for renewable energy and raw materials, it is widely used
in the bioconversion of renewable cellulosic biomass. Glucose, from appropriate hydrolysis of this cellulosic
biomass under the treatment of advanced biotechnology can be used in different applications such as production
of fuel ethanol, single cell protein, feed stock, industrially important chemicals [1,2,3]. Microbial conversion of
cellulosic/ lignocellulosic biomass into useful products is a complex process involving combined action of three
enzymes namely endoglucanase (EC 3.2.1.4), exoglucanase EC (3.2.1.91) and β-glucosidase (EC 3.2.1.21) [4].
Exoglucanases are of two types; 1, 4-β-D-glucan cellobiohydrolase (EC 3.2.1.91) which removes cellobiose
units and 1, 4-β-D-glucan glucohydolase (EC 3.2.1.74) which removes glucose units both acting from the non-reducing
ends of oligosaccharides produced by the action of endoglucanase [5]. Cellobiohydrolase, often called
an exoglucanase, is the major component of the fungal cellulase system accounting for 40-70% of the total
cellulase proteins and can hydrolyse highly crystalline cellulose [6]. Cellobiohydrolases remove mono- and
dimers from the end of the glucose chain. Most commercial cellulases are mesophilic enzymes produced by the
filamentous fungi Trichoderma reesei and Aspergillus niger with Trichoderma as the most leading strain [7].
This reflects well the fact that filamentous fungi are naturally excellent protein secretors and can produce
industrial enzymes in feasible amounts [8].
In the last decades, the high production cost and low yields of cellulases are the major problems for
industrial application. Therefore, investigations on the ability of microbial strains to utilize inexpensive substrate
[9] and improvement of enzyme productivity [10,11] have been implemented. Concerning the optimization of
biotechnological processes modeling has become a prerequisite for the development of optimization and control
methods. The usefulness of simulation models in connection with experimental planning is also evident. Thus,
modeling and simulation are valuable tools in basic biological research by directing investigators towards a
search for quantifiable results. Furthermore, for the practical implementation of control, estimation of non-measurable
68
state variables is necessary as well.
The aim of this study is to produce an inexpensive and highly active cellulase lies in a combination of critical
factors such as, improved enzyme quality, enhanced enzyme productivity and yield, prolonged enzyme lifetime,
and minimal cost of media and substrate.
2. Upgrading of Exoglucanase Production By Trichoderma reesei NRC 210
II. MATERIALS AND METHODS
Microorganism: Trichoderma reesei NRC 210 was obtained from the Culture Collection of Microbial
Chemistry Department, Division of Genetic Engineering and Biotechnology, National research centre. Egypt.
Media:
a. Maintenance medium for stock fungal cultures
Organism was cultivated and kept on slants of Potato Dextrose agar [12].
b. Inoculum's medium
Organisms are grown on Potato Dextrose broth medium for 2 days and then inoculated into the
69
screening medium.
c. Screening medium for exoglucanase production
Modified Mandel's liquid medium was used which has the following composition (g/l): Carbon source
(Carboxymethylcellulose), 5.0; Urea, 0.3.; (NH4)2SO4, 1.4; Proteose peptone "Difco", 1; KH2PO4, 2; CaCl2, 0.3;
MgSO4.7H2O, 0.3; FeSO4.7H2O, 5mg; MnSO4.7H2O, 1.6 mg; ZnSO4.7H2O, 1.4 mg; CoCl2, 2 and Tween 20,
2.5 ml. Initial pH value was adjusted to 5.6. The medium was sterilized by autoclaving at 1.5 atmosphere and
121°C for 20 min. [13].
Batch Fermentation: Enzyme production experiments were performed in a 7.5L BioFlo 310 benchtop
Fermentor/ Bioreactor (New Brunswick scientific Co., Inc.) with a working volume 5L. To 2.7L growth
medium, containing cellulose as a carbon source with a concentration 10g/L, about 300ml of the inoculum
prepared on cellulose was added which corresponds to 10% of the total worked volume (3L). The initial pH was
adjusted in the range 5.5-6.0. Exoglucanase production was followed for 7 days; samples were regularly
withdrawn and analyzed for exoglucanase activity. The pH was controlled above or below 5 by 1N HCl or
NaOH using peristaltic pumps. Foam was controlled by the addition of silicon antifoam (Fluka). The fermentor
was aerated at a flow rate of 1.5L/min, corresponding to 0.5 (v/v)/min. Oxygen level in the fermentor was
monitored during the experiments.
Analytical determination:
Exoglucanase (FPase) activity was determined by the method described by Elshafei et al., (1990) [14]
while Protein determined by the lowry method [15]. Total reducing sugars was determined by DNS method
described by Ghose (1984) [16].
Kinetic (Mathematical) procedures:
MODEL FOR GROWTH KINETICS
Monod model
Monod model relates the specific growth rate and an essential substrate concentration and was
described by equation [17]:
Where S is the nutrient (substrate, S) concentration and Ks is the half saturation constant for that
nutrient, i.e. the nutrient concentration at which one-half the maximum specific growth rate is achieved.
MODEL FOR PRODUCT FORMATION KINETICS
Leudeking-Piret model
The kinetics of cellulase protein production was described by Leudeking-Piret model [18] which states
that the product formation rate varies linearly with both the instantaneous cell mass concentration (x) and
growth rate as:
Biomass accumulation in the culture medium (gb L-1 h-1)
Exoglucanase accumulation in the culture medium (U L-1 h-1)
3. Upgrading of Exoglucanase Production By Trichoderma reesei NRC 210
α Growth-associated coefficient for enzyme production (U gb
70
-1)
-1 h-1)
β Growth-independent coefficient for enzyme production (U gb
X Biomass concentration (gb L-1)
III. RESULTS AND DISCUSSION
From previous study in the shake flask experiments, we found that the medium containing cellulose at
a concentration of 1% with a pH value 5.6 and incubation period for 7 days at 25°C were the best conditions for
exoglucanase production. Batch type is the most common operational mode of cellulase production because it is
the easiest to start up and control. So a set of fermentation batches were established to optimize the production
of enzyme in semi-industrial scale.
Batch fermentation for exoglucanase production by T. reesei NRC 210 (under conditions of Uncontrolled
pH, Stirrer-speed: 350 rpm, Temperature: 25°C and Aeration level: 0.5 (vvm)
9
8
7
6
5
4
3
2
1
0
0 1 2 3 4 5 6 7 8
Time (day)
Enzyme activity (U/ml)
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
pH
pH
U/ml
Figure (1)
From these results shown in figure (1) which represents the time course relationship between pH
values along with exoglucanase activity in (U/ml), we found that maximum enzyme activity was obtained at a
pH range 4-5 then the enzyme activity decreases with the increase of pH values, from these results, we obtained
the optimum range of pH of exoglucanase production at fermentor level at pH 4-5 which was previously
reported by [19].
Comparison between uncontrolled and controlled pH batch fermentations for production of exoglucanase
enzyme from T. reesei NRC 210
45
40
35
30
25
20
15
10
5
0
0 20 40 60 80 100 120 140 160 180
Time (hour)
Biomass (g/l)
Uncontrolled
Controlled
Figure (2)
4. Upgrading of Exoglucanase Production By Trichoderma reesei NRC 210
71
7
6
5
4
3
2
1
0
0 20 40 60 80 100 120 140 160 180
Time (hour)
Sp. Activity (U/mg protein)
uncontrolled
controlled
Figure (3)
From these results shown in figure (2) which represents the time course relationships of biomass in
(g/l) of the two batches, in both patterns growth begin to increase after the first 24 hrs in the batch to give a
maximum biomass weight after 120 hrs for uncontrolled pH batch and 144 hrs for controlled pH one, we
conclude that by controlling the pH value of the culture medium, we could improve the fungal growth about
63% with 24hrs excess time. While figure (3) represents the pattern of specific enzyme activity (U/mg protein)
for the two batches, we conclude that by controlling the pH of the culture medium, we could improve the
exoglucanase activity 15 fold.
Comparison between batch fermentations for production of exoglucanase enzyme from T. reesei NRC 210
with 250 and 350 rpm agitation speed.
45
40
35
30
25
20
15
10
5
0
0 24 48 72 96 120 144 168 192
Time (hour)
Biomass (g/l)
250 rpm
350 rpm
Figure (4)
7
6
5
4
3
2
1
0
0 20 40 60 80 100 120 140 160 180
Time (hour)
Sp. activity (U/mg protein)
250 rpm
350 rpm
Figure (5)
5. Upgrading of Exoglucanase Production By Trichoderma reesei NRC 210
From the results shown in figure (4) which represents the time course relationship of the biomass in
(g/l) for the two batches, we can conclude that by increasing the agitation speed we could improve the fungal
productivity with about 80% by further 24 hrs excess times. While figure (5) represents the pattern specific
enzyme activity in (U/mg protein) for the two batches, we estimated that we could improve the exoglucanase
activity by increasing the agitation speed to 350 rpm to about 79% fold by 72 hrs excess time. This conclusion
was reported previously by Reczey [20].
Application of Kinetic Models on the Fermentation Process
The experimental results of the pH controlled process with 350 rpm agitation speed and cellulose as
sole carbon source were used to apply a kinetic model for this process. For this purpose the biomass growth rate,
enzyme production rate, specific growth rate and specific enzyme production rate were calculated.
The enzyme production followed Luedeking-Piret equation (By constructing a relationship between
specific growth rate and specific enzyme production rate) as shown in the following equation and represented in
figure (6).
dP/dt = α * dX/dt + β * X
where α = 0.2136, β = 0.0087 (h-1),
dP/dt: Production rate, dX/dt: Growth rate, α & β : Constants, X: Biomass conc.
Due to a major difference between the values of α and β values with high β value, it recommends that
the production of exogluconase enzyme is mainly growth associated type, and this confirmed our experimental
data. This conclusion was in complete agreement with that reported by Muthuvelayudham & Viruthagiri
(2006) with approximately the same values of α and β.
The substrate consumption followed Monod kinetic equation and using the values of maximum
specific growth rate calculated experimentally and saturation constant from literature, the substrate
concentration was calculated during the fermentation time and represented in figure (7). The substrate decreased
gradually from 10 g/l cellulose at zero time to be consumed completely after 5 days.
μ = (μmax * S) / (Ks+S)
Where μ: Specific growth rate = (dX/dt)/X, μmax & Ks : Constants, S: Substrate conc. (cellulose)
Figure (7)
72
6. Upgrading of Exoglucanase Production By Trichoderma reesei NRC 210
IV. CONCLUSION
Factors affecting the optimization of exoglucanase production from Trichoderma reesei NRC210 were
73
studied using cellulose as a carbon source.
By controlling the pH value between (4-5) and agitation speed to 350 rpm, the enzyme activity was
increased by about 15 and 1.8 folds respectively.
By applying the kinetic models Leudeking & Piret model for exoglucanase production and Monod
model for fungal growth to the fermentation process, a best fit was achieved with α= 0.2316 and β= 0.0087 (h-1)
which led to the conclusion that the enzyme production is growth associated.
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