Joshua’s Blog!

Practice materials for IT professionals looking for certification in CCNA, CCNP, CCDP, MCSE, MCDBA, MCSD, MCSA, MCP, CIW, ORACLE, Security+ and A+.

Certay IT Development is the online Certification Expert, which provide TestKing and Pass4sure the real questions and correct answers since 2001. In net-based training and certification preparation services field, Certay IT Development has the best exprienced engineers, that’s why we can supply the highly standardized, top quality, well documented certification guideline courses.

Certay Top 30 Certification Exams List:

1. Cisco Certified Network Associate: 640-802
2. CCIE Routing and Switching Written Exam: 350-001
3. BSCI - Building Scaleable Cisco Internetworks: 642-901
4. MCDBA Managing and Maintaining a Microsoft Windows Server 2003 Environment: 70-290
5. BCMSN - Building Converged Cisco Multilayer Switched Networks: 642-812
6. ISCW - Implementing Secure Converged Wide Area Networks: 642-825
7. Designing for Cisco Internetwork Solutions: 640-863
8. MCSA 2003 Implementing Managing and Maintaining a Microsoft Windows Server 2003 Network Infrastructure: 70-291
9. ONT - Optimizing Converged Cisco Networks: 642-845
10. IP Communications Quality of Service (QoS): 642-642
11. TS: Upgrading MCSE on Wndws Serv 2003 to Wndws Serv 2008: 70-649
12. Composite: 642-892
13. Microsoft SQL Server 2005 Implementation & Maintenance: 70-431
14. MCSE 2003 Security Planning Implementing and Maintaining a Microsoft Windows Server 2003 AD Infrastructure: 70-294
15. SECURITY+ CERTIFICATION EXAM: sy0-101
16. Network+ Certification Exam : n10-003
17. VMware Certified Professional on VI3: VCP-310
18. MCSE 2003 Security Planning and Maintaining a Microsoft Windows Server 2003 Network Infrastructure: 70-293
19. Interconnecting Cisco Networking Devices Part 1: 640-822
20. TS: Exchange Server 2007, Configuring: 70-236
21. MCSE Installing Configuring and Administering Microsoft Windows XP Professional: 70-270
22. Troubleshooting Unified Communications (TUC): 642-426
23. MCSE Managing and Maintaining a Microsoft Windows Server 2003 Environment for a W2K MCSA: 70-292
24. TS: Microsoft Office SharePoint Server 2007, Configuring: 70-630
25. CompTIA A+ Essentials Exam: 220-601
26. IP Communications Cisco Voice Over IP: 642-432
27. Interconnecting Cisco Networking Devices Part 2: 640-816
28. Gateway Gatekeeper(GWGK): 642-453
29. MCSE 2003 Planning Implementing and Maintaining a Microsoft Windows Server 2003 Environment for a W2K MCSE: 70-296
30. CCIE Voice Written: 350-030

In addtion, Certay offer latest news in Certification field, including new released certification exam, any discount information for any exam, good suggestion or review on certification exam, You can find all information you need through Certay.

Many cultures obtained from a culture collection, such as ECACC, will arrive frozen and in order to use them the cells must be thawed and put into culture. It is vital to thaw cells correctly in order to maintain the viability of the culture and enable the culture to recover more quickly. Some cryoprotectants, such as DMSO, are toxic above 4oC therefore it is essential that cultures are thawed quickly and diluted in culture medium to minimize the toxic effects.

A schematic diagram of “Resuscitation of Frozen Cell Lines”

Materials

• Media– pre-warmed to the appropriate temperature (refer to the ECACC Cell Line Data Sheet for the correct medium and size of flask to resuscitation into.)
• 70% ethanol in water
• DMSO

Equipment

• Personal protective equipment (sterile gloves, Laboratory coat, safety visor)
• Waterbath set to appropriate temperature
• Glass Bottom Dishes
• Microbiological safety cabinet at appropriate containment level
• CO2 incubator
• Pre labeled flasks
• Marker Pen
• Pipettes
• ELISA plates
• Ampule Rack
• Tissue

Procedure

1. Read Technical data sheet to establish specific requirements for your cell line.
2. Prepare the flasks as appropriate (information on technical data sheet). Label with cell line name, passage number and date.
3. Collect ampule of cells from liquid nitrogen storage wearing appropriate protective equipment and transfer to laboratory in a sealed container.
4. Still wearing protective clothing, remove ampule from container and place in a waterbath at an appropriate temperature for your cell line e.g. 37oC for mammalian cells. Submerge only the lower half of the ampule. Allow to thaw until a small amount of ice remains in the vial - usually 1-2 minutes. Transfer to class II safety cabinet.
5. Wipe the outside of the ampule with a tissue moistened (not excessively) with 70% alcohol hold tissue over ampule to loosen lid.
6. Slowly, dropwise, pipette cells into pre-warmed growth medium to dilute out the DMSO (cell culture flasks prepared in Step 2).
7. Incubate at the appropriate temperature for species and appropriate concentration of CO2 in atmosphere.
8. Examine cells microscopically (phase contrast) after 24 hours and sub-culture as necessary.

Key Points

1. Most text books recommend washing the thawed cells in media to remove the cryoprotectant. This is only necessary if the cryoprotectant is known to have an adverse effect on the cells. In such cases the cells should be washed in media before being added to their final culture flasks. See Protocol 7 for further details.
2. Do not use an incubator to thaw cell cultures since the rate of thawing achieved is too slow resulting in a loss of viability.
3. If a CO2 incubator is not available gas the flasks for 1-2 minutes with 5% CO2 in 95% air filtered through a 0.25m filter.
4. For some cultures it is necessary to subculture before confluence is reached in order to maintain their characteristics e.g. the contact inhibition of NIH 3T3 (Prod. No. 93061524) cells is lost if they are allowed to reach confluence repeatedly.

Scouce: ECACC Handbook Protocol 2

The Microsoft 2003 Server Exam, 70-291, is one of the core exams of the MCSE and MCSA certification tracks. The exam tests a candidate’s knowledge of Windows 2003 networking environments and how to implement a successful Windows Server 2003 network in either existing Windows environments or on totally new networks. The exam features simulation and analysis questions that require the candidate to have a thorough working knowledge of the Windows Server 2003 operating system and the way that a Windows 2003 network operates.

About The Microsoft 2003 Server Exam

The Microsoft Certified Systems Administrator (MCSA) on Windows Server 2003 credential is intended for IT professionals who work in the typically complex computing environment of medium to large companies. An MCSA candidate should have 6 to 12 months of experience administering client and network operating systems in environments that have the following characteristics:

250 to 5,000 or more users

Three or more physical locations

Three or more domain controllers

Network services and resources such as messaging, database, file and print, proxy server, firewall, Internet, intranet, remote access, and client computer management

Connectivity requirements such as connecting branch offices and individual users in remote locations to the corporate network and connecting corporate networks to the Internet

About The Certay Microsoft 70-291 Exam Practice Engine

Certay offers free demo for 70-291 exam (MCSE 2003 - Implementing Secure Converged Wide Area Networks). We are the only one site can offer demo for almost all products.Give your career a boost and start earning your Microsoft certification today! The Certay 70-291 exam products are designed to maximize your learning productivity and focus only on the important aspects that will help you pass your exam the first time. We provide you with questions and verified answers accompanied by detailed explanations. These questions and answers, supplied by our industry experts, provide you with an experience like taking the actual test and ensure that you fully understand the questions as well as the concepts behind the questions.

Certay is the online Certification Expert, which provide testking and pass4sure the real questions and correct answers since 2001.