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                                北京拜爾迪低價(jià)轉(zhuǎn)讓一批血清替代產(chǎn)品

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                                我公司幫助客戶低價(jià)轉(zhuǎn)讓一批血清替代產(chǎn)品,用于干細(xì)胞培養(yǎng)用,INVITROGEN公司,貨號(hào)10828-028,500ml的,價(jià)格絕對(duì)優(yōu)惠,有需要,請(qǐng)隨時(shí)聯(lián)系。電話:010-82642153  82642395
                                QQ:   1021533732   827936344  1059697723   1462392831 

                                技術(shù)資料如下:
                                KNOCKOUTSR
                                Serum Replacement for Embryonic Stem Cells
                                Cat. No. 10828 500 mL
                                Storage Conditions: −5 to −20°C
                                Intended Use:
                                KNOCKOUT™ SR is used to support the growth of
                                undifferentiated embryonic stem (ES) cells in culture. It is
                                intended for laboratory research use only.
                                Background
                                Over the past several years, the number of researchers culturing
                                embryonic stem cells has increased dramatically. This increase
                                is directly related to the utility of ES cells for the study of gene
                                function and regulation (gene targeting studies), the production
                                of animal models for the study of human diseases, and cell
                                differentiation studies. General culture conditions are well
                                established (1,2) and usually require ES cells to be grown on a
                                mitotically-inactive feeder cell layer. The media generally
                                recommended is a D-MEM formulation supplemented with FBS,
                                L-glutamine, non-essential amino acids, β-mercaptoethanol, and
                                antibiotics if desired. Additionally, Leukemia Inhibitory Factor
                                (LIF, ESGRO™ Cat. No. 13275) is often used to aid in
                                maintaining the pluripotential nature of ES cells.
                                One of the most important parameters surrounding ES cell
                                culture is the maintenance of ES cells in an undifferentiated
                                state. Until now, FBS was the only option for nutritive
                                supplementation of ES cell media. Unfortunately, FBS also
                                contains undefined factors which can promote differentiation of
                                ES cells. Thus, each lot must be screened prior to use. In
                                addition, each lot of FBS is different from the last one, or the next
                                one, so screening is a continuous task. Since FBS screening is
                                laborious and costly, once a suitable lot has been identified, a
                                sufficient quantity is purchased and stored to meet laboratory
                                needs. This ties up both laboratory funds and storage space.
                                Additionally, there are issues surrounding hemoglobin and
                                endotoxin levels in FBS. All of the drawbacks of serumsupplemented
                                ES cell culture, including heat-inactivation of FBS,
                                can be alleviated with the use of KNOCKOUT SR, Serum
                                Replacement for Embryonic Stem Cells. KNOCKOUT SR is a
                                defined formulation that will provide you with consistent growth
                                conditions for your ES cell cultures. ES cells grown in
                                KNOCKOUT SR-supplemented media are substantially less
                                differentiated than those grown in FBS-supplemented media,
                                and germline transmission is not compromised in the least (see
                                Tables 1 & 2). The performance of KNOCKOUT SR is further
                                enhanced when used in conjunction with KNOCKOUT D-MEM
                                (Cat. No. 10829), a special basal medium designed specifically
                                for ES cell culture.
                                ES cells cultured for multiple passages in KNOCKOUT SR or
                                FBS-containing ES Cell Medium yielded the following results
                                when injected into host blastocysts:
                                Table 1: Chimeric Birth Data
                                KNOCKOUT™SR
                                Containing
                                ES Cell Medium
                                FBSContaining
                                ES Cell Medium
                                # of Blastocysts
                                Injected
                                104 32
                                Live Pups
                                (%)
                                20 (19%) 7 (22%)
                                Chimeric Pups
                                (%)
                                10 (50%) 3 (43%)
                                Male Chimeras
                                (%)
                                7 (70%) 1 (33%)
                                Table 2: Germline Transmission Data
                                Mice Derived from KNOCKOUT™ SR ES Cells Mice Derived from FBS ES Cells
                                Founder #
                                and sex
                                % agouti
                                coat color Germline
                                # agouti
                                pups/total
                                (%)
                                Founder #
                                and sex
                                % agouti
                                coat color Germline
                                # agouti
                                pups/total
                                (%)
                                1 male 100 yes 12/35 (34%) 1 male 100 yes 6/6 (100%)
                                2 male 100 yes 22/29 (76%) 2 female 70 no no pups
                                3 male 100 yes 26/29 (90%) 3 female 40 no 0/17 (0%)
                                4 male 95 no 0/30 (0%)
                                5 male 75 yes 5/28 (18%)
                                6 male 40 yes 1/28 (4%)
                                7 male 5 yes 28/29 (96%)
                                8 female 80 yes 7/7 (100%)
                                9 female 70 no 0/6 (0%)
                                10 female 50 not bred -
                                Product Description
                                KNOCKOUT SR is a serum-free formulation designed to directly
                                replace FBS in ES cell culture and provide the highest level of
                                performance and ease of use. DO NOT HEAT-INACTIVATE
                                KNOCKOUT SR. Unlike FBS, KNOCKOUT SR contains no serum
                                factors (i.e., complement) that require inactivation prior to use.
                                This product may be used for the growth and maintenance of
                                undifferentiated ES cells at the same FBS concentration
                                currently used, generally 15%. If comparing KNOCKOUT SR sideby-
                                side with FBS, please note that KNOCKOUT SR has been
                                optimized for use at about 15% (12.5 - 17.5%) and a decline in
                                performance may be seen when used at higher concentrations
                                (i.e. 30%). KNOCKOUT SR can also replace FBS in media used
                                for blastocyst injection, and for the cryopreservation of ES cells
                                at the same supplementation concentration normally used.
                                KNOCKOUT SR cannot be used as a replacement for FBS in
                                the plating of feeder cells. While the formulation contains
                                sufficient factors to allow plating of ES cells, fibroblasts have an
                                increased need for undefined attachment factors and will not
                                adequately attach in this formulation. However, once plated, the
                                feeder cell layer will remain attached to the plates when placed
                                into media containing KNOCKOUT SR. See instructions for use
                                below.
                                When KNOCKOUT SR is used for differentiation of ES cells into
                                specific cell types, supplementation with growth and/or
                                attachment factors may need to be empirically determined.
                                Precautions
                                1. L-glutamine supplementation is required, as L-glutamine
                                is not contained in KNOCKOUT SR or KNOCKOUT D-MEM.
                                2. KNOCKOUT SR should not be heat-inactivated.
                                3. KNOCKOUT SR should not be used in place of FBS to plate
                                feeder cells.
                                4. For optimal performance, minimize prolonged 37°C water
                                bath exposure of KNOCKOUT SR, and any media made
                                using this formulation (see instructions for use.)
                                Do Not Use This Product If:
                                1. Product packaging appears compromised.
                                2. KNOCKOUT SR appears cloudy.
                                Storage
                                1. Store KNOCKOUT SR at −5 to −20°C in the dark.
                                2. For optimal performance, do not subject KNOCKOUT SR to
                                repeated freeze/thaw cycles. We recommend no more than
                                two freeze/thaws for optimal product performance.
                                Instructions for Use
                                As with all cell culture media, minimize unnecessary exposure to
                                light. To thaw, place KNOCKOUT SR in a 37°C waterbath and
                                swirl occasionally. Remove promptly once thawed. For optimal
                                performance, do not store KNOCKOUT SR at 2 to 8°C for more
                                than one week. If the entire bottle will not be used within one
                                week of thaw date, it is strongly recommended that aliquots of
                                the serum replacement be stored under sterile conditions at -5 to
                                -20°C. Gently swirl the bottle to mix prior to aseptically aliquoting
                                into sterile vessels of choice. Store aliquots at -5 to -20°C and
                                thaw as needed.
                                To make ES Cell Medium, add 2-4 mM L-glutamine (Cat. No.
                                25030) to KNOCKOUT D-MEM or other basal media. Next, add
                                all other supplements as you normally would (non-essential
                                amino acids, β-mercaptoethanol, and antibiotics if desired) being
                                sure to omit FBS. Replace FBS with KNOCKOUT SR at the same
                                concentration that FBS is routinely used. The addition of LIF (3)
                                to ES cell culture media is recognized to be very beneficial for
                                maintaining the undifferentiated nature of ES cells. There are no
                                direct substitutes for LIF present in KNOCKOUT SR. If the ES
                                cell line being used is conditioned to supplementation with LIF,
                                you need to continue to add LIF. If the ES cell line is not
                                conditioned to LIF, we have found that optimal performance of
                                KNOCKOUT SR is obtained only when KNOCKOUT D-MEM is
                                used. Therefore, if your system does not require LIF, it is
                                especially important to use KNOCKOUT SR in conjunction with
                                KNOCKOUT SR D-MEM.
                                If feeder cells are required, plate as you normally would in
                                serum-containing medium. Allow cells to attach and spread
                                for a minimum of 8 hours (overnight). Aspirate supernatant. If
                                desired, rinse feeder cells one time with ES Cell Medium
                                containing KNOCKOUT SR to remove traces of FBS from the
                                feeder layer. Plate ES cells in the KNOCKOUT SR -containing
                                medium onto feeder cells. Incubate overnight. Fluid-change ES
                                cells as you normally would, using KNOCKOUT SR-containing ES
                                Cell Medium. STO cells attach to plasticware a bit less firmly
                                than mouse embryo fibroblasts. If using STO feeder cells, use
                                extra care when fluid changing cultures in order to maintain an
                                intact feeder layer. Note: As with all cell culture media, for
                                optimal performance, pre-warm ES Cell Medium just prior to use.
                                Avoid unnecessary prolonged incubation in 37°C water baths.
                                KNOCKOUT SR does not contain trypsin inhibitors. Therefore,
                                trypsin must be removed or inactivated when culturing ES cells
                                in KNOCKOUT SR-containing medium.
                                Routine Cell Maintenance. Trypsinize ES cells as you normally
                                would (we recommend 0.25% Trypsin/0.04% EDTA, Cat. No.
                                25200), being sure to triturate thoroughly to achieve a singlecell
                                suspension before quenching trypsin action. Resuspend
                                cells in KNOCKOUT SR-containing ES Cell Medium. Centrifuge
                                cells to produce a cell pellet. Aspirate supernatant to remove
                                trypsin-containing medium, resuspend pellet in fresh KNOCKOUT
                                SR-containing ES Cell Medium and replate as desired.
                                Trypsinizing neo-resistant ES Cell Clones. When trypsinizing
                                ES cell clones following electroporation and selection, it is
                                impractical to remove trypsin by centrifugation, as working
                                volumes are small. We recommend quenching trypsin activity
                                with soybean trypsin inhibitor (Cat. No. 17075). Make a sterile 5
                                mg/ml solution of soybean trypsin inhibitor in Dulbecco’s PBS.
                                Trypsinize clones as usual. Add one-tenth the volume of
                                soybean trypsin inhibitor to the trypsinized ES cells. Transfer
                                cells to KNOCKOUT SR-supplemented medium and replate as
                                desired.
                                Alternatively, clones may be dispersed into small cell clumps
                                without the use of trypsin. Pick clones into a 96-well dish
                                containing ~100μl of KNOCKOUT SR-supplemented medium.
                                With a sterile P-200, pipet triturate individual colonies until cell
                                clumps of just a few cells are produced. Transfer cells to larger
                                multi-welled dishes containing additional KNOCKOUT SR -
                                supplemented medium.
                                When transfecting, we recommend electroporating ES cells in
                                PBS. Cell recovery and selection following electroporation can
                                be accomplished using KNOCKOUT SR-containing ES Cell
                                Medium. We recommend using GENETICIN
                                ® in liquid (Cat. No.
                                10131) or dry powder form (Cat. No. 11811) at your normal
                                concentration in KNOCKOUT SR-containing ES Cell Medium.
                                Quality Control Testing
                                The performance of KNOCKOUT SR is tested against an inhouse,
                                previously approved reference lot of KNOCKOUT SR.
                                References
                                1 Robertson, E.J., ed., Oxford: IRL Press. Teratocarcinomas
                                and embryonic stem cells; a practical approach (1987).
                                2 Hogan, B., Beddington, R., Costantini, F., Lacy E. Cold Spring
                                Harbor Laboratory Press. Manipulating the Mouse Embryo, second
                                edition (1994).
                                3 Smith, A.G., Heath, J.K., Donaldson, D.D., Wong, G.G., Moreau, J.,
                                Stahl, M., Rogers, D. Nature, 336, 688 (1988).
                                ESGROTM is a trademark of AMRAD Corporation
                                For further information on this or other GIBCOTM products, contact
                                Technical Services at the following:
                                United States TECH-LINE SM : 1 800 955 6288
                                Canada TECH-LINE: 1 800 757 8257
                                Outside the U.S. and Canada, refer to the GIBCO products catalogue for
                                the TECH-LINE in your region.
                                You may also contact your Invitrogen Sales Representative or our World
                                Wide Web site at www.invitrogen.com.
                                For research use only.
                                CAUTION: Not intended for human or animal
                                diagnostic or therapeutic uses.
                                June 2001 Form No. 3878



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