Yeah you could use the simple protocl for transformation like one given in manniatis involving cacl2 treated competent cells. I have used this method for transforming 21 kb cosmid. I hope this helps ...
TY - JOUR. T1 - A YAC-, P1-, and cosmid-based physical Map of the BRCA1 region on chromosome 17q21. AU - Couch, Fergus J.. AU - Castilla, Lucio H.. AU - Xu, Junzhe. AU - Abel, Kenneth J.. AU - Welcsh, Piri. AU - King, Stephanie E.. AU - Wong, Linghua. AU - Ho, Peggy P.. AU - Merajver, Sofia. AU - Brody, Lawrence C.. AU - Yin, Guiying. AU - Hayes, Steve T.. AU - Gieser, Linn M.. AU - Flejter, Wendy L.. AU - Glover, Thomas W.. AU - Friedman, Lori S.. AU - Lynch, Eric D.. AU - Meza, Jose E.. AU - King, Mary Claire. AU - Law, David J.. AU - Deaven, Larry. AU - Bowcock, Anne M.. AU - Collins, Francis S.. AU - Weber, Barbara L.. AU - Chandrasekharappa, Settara C.. PY - 1995/1/1. Y1 - 1995/1/1. N2 - A familial early-onset breast cancer gene (BRCA1) has been localized to chromosome 17q21. To characterize this region and to aid in the identification of the BRCA1 gene, a physical map of a region of 1.0-1.5 Mb between the EDH17B1 and the PPY loci on chromosome 17q21 was generated. The physical map is ...
The set of clone ends is dumped as part of the gff files: http://www.sanger.ac.uk/Projects/C_elegans/WORMBASE/GFF_files.shtml This is the source for the extents displayed in WormBase. The caveat with this is that the true end is not marked up for all clones. The early cosmids do not have such annotations because nobody thought about marking them up. Later cosmids do have clone left and right ends as this became part of the standard procedure. Finally, many of the YACs do not have clone ends because the segment submitted to GenBank/EMBL is much smaller than the full clone, and hence the true ends lie within sequences already finished at that stage of the sequencing (i.e. we never went back to update clone ends in sequence already finished ...
The set of clone ends is dumped as part of the gff files: http://www.sanger.ac.uk/Projects/C_elegans/WORMBASE/GFF_files.shtml This is the source for the extents displayed in WormBase. The caveat with this is that the true end is not marked up for all clones. The early cosmids do not have such annotations because nobody thought about marking them up. Later cosmids do have clone left and right ends as this became part of the standard procedure. Finally, many of the YACs do not have clone ends because the segment submitted to GenBank/EMBL is much smaller than the full clone, and hence the true ends lie within sequences already finished at that stage of the sequencing (i.e. we never went back to update clone ends in sequence already finished ...
A few weeks ago I described some problems we were having with cosmid libraries. I got several good responses. The one below was the best and might be useful to others. What you have been seeing is actually the gradual loss of the selection pressure, which results from the degradation of the ampicillin in the medium by the beta-lactamase produced by the amp- containing clone. This eventually leads to the loss of the amp- containing cosmid. You might recall the growth of satellite colonies around the genuine transformants when you let the incubation of transformation plates go longer, say two days instead of overnight. After 4-6 weeks the clone has lost the amp-containing cosmid and becomes ampicillin sensitive. That is why you transferred the cells to ampicillin-containing liquid medium and you did not see any growth the next day. The same goes for the lower yield of cosmid DNA after 3-4 weeks, since the colony contains a population of resistant and sensitive cells. My suggestion to you is to ...
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pWEB::TNC Deletion Cosmid Transposition Kit from EPICENTRE Biotechnologies,The pWEB::TNC Deletion Cosmid Cloning Kit enables you to prepare, in about two days, a complete and unbiased primary cosmid library of genomic DNA for subsequent use in making nested deletion sublibraries. High efficiency cosmid library construction is accomplished using easy and highly repr,biological,biology supply,biology supplies,biology product
10 mg transfection-grade endofree plasmid or cosmid DNA, HiSpeed Mega, HiSpeed Giga, EF plasmid, HiSpeed Mega and Giga EF Plasmid Kits
The DHFR-G8 cell line was produced by M.C. Hung, et al., in 1986 from the NIH/3T3 mouse fibroblast cell line which was cotransfected with the cNEU-p clone and the pSV2-DHFR plasmid. This cell line was developed from one methotrexate resistant colony by selection in 0.6 uM methotrexate and 10% dialyzed calf serum. These cells contain 50-100 copies of the cNeu-P (normal rat cosmid DNA) and produce approximately 4 x 10(5) molecules of encoded p185 protein per cell.
SpinSmart Plasmid Miniprep kits are designed to rapidly purify plasmid DNA from bacterial cultures.The protocol below is appropriate for both CM-410-50 and CM-410-250.
Ji H, Smith L.M, Guilfoyle RA. 1994. Rapid isolation of cosmid insert DNA by triple-helix-mediated affinity capture. Genetic Analysis, Techniques and Applications. 11:43-7. ...
Ji H, Smith L.M, Guilfoyle RA. 1994. Rapid isolation of cosmid insert DNA by triple-helix-mediated affinity capture. Genetic Analysis, Techniques and Applications. 11:43-7. ...
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cosmid definition: Genetics A hybrid vector that has been spliced with plasmid DNA for cloning huge genes or gene fragments.; a kind of plasmid (often utilized as a cloning vector) constructed because…
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The method used for the isolation of large scale cosmid and plasmid DNA is an unpublished modification (16) of an alkaline lysis procedure (17,18) followed by equilibrium ultracentrifugation in cesium chloride-ethidium bromide gradients (1). Briefly, cells containing the desired plasmid or cosmid are harvested by centrifugation, incubated in a lysozyme buffer, and treated with alkaline detergent. Detergent solubilized proteins and membranes are precipitated with sodium acetate, and the lysate is cleared first by filtration of precipitate through cheesecloth and then by centrifugation. The DNA-containing supernatant is transferred to a new tube, and the plasmid or cosmid DNA is precipitated by the addition of polyethylene glycol and collected by centrifugation. The DNA pellet is resuspended in a buffer containing cesium chloride and ethidium bromide, which is loaded into polyallomer tubes and subjected to ultracentrifugation overnight. The ethidium bromide stained plasmid or cosmid DNA bands, ...
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The NucleoBond BAC 100 Kit is designed to purify large DNA fragments such as cosmids, bacteriophage P1 clones, PACs, and BACs, without phenol/chloroform extraction. 1 hour protocol accomodates vectors up to to 300 kb.
Maxiprep NucleoBond Plasmid Kits: Purify plasmid DNA, cosmids, BACs, PACs, and YACs in just a few hours-no phenol/chloroform extraction. Use for transfection, in vitro transcription, and automated sequencing.
Kanamycin - The frozen stock solutions of kanamycin are at 50mg/ml in H2O, and are marked with green. The final concentration for LB liquid culture for growing plasmids is 50ug/ml, and for cosmids is 20ug/ml. To obtain 50ng/ml in 100ml of LB, add 100ul stock solution, and to obtain 20ug/ml, add 40ul stock solution ...
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Despite screening various growth media, we failed to detect the production of any 2-hydroxyphenylthiazoline-containing metabolites by S. venezuelae. This is potentially explained by the low levels of sven0516 expression in the bldM mutant (Fig. 3), which is surprising given that sven0517 is likely to be in the same operon, and possibly reflects differential mRNA stability for the two genes. We therefore elected to express the sven0503-sven0517 gene cluster in the engineered host S. coelicolor M1152.23 A clone (SV-2_E03) from an ordered genomic cosmid library of the S. venezuelae chromosome containing a segment extending from sven0496 to sven0518 was PCR-targeted in Escherichia coli with a 5.2 kb SspI fragment from pIJ10702 that contains oriT, and the øC31 integrase gene and phage attachment site (attP). The resulting cosmid, SV-2_E03::SspI, was introduced into S. coelicolor M1152 by conjugation, whereupon it integrated into the chromosomal øC31 attB site. Wild type S. coelicolor M1152 and the ...
TY - JOUR. T1 - Isolation and characterization of a novel gene deleted in digeorge syndrome. AU - Kurahashi, Hiroki. AU - Akagi, Kenzo. AU - Inazawa, Johji. AU - Ohta, Tohru. AU - Niikawa, Norio. AU - Kayatani, Futoshi. AU - Sano, Tetsuya. AU - Okada, Shintaro. AU - Nishisho, Isamu. PY - 1995/4/1. Y1 - 1995/4/1. N2 - The region commonly deleted in DiGeorge syndrome (DGS) has been localized at 22q11.1-q11.2 with the aid of a high resolution banding technique. A 22q11 specific plasmid library was constructed with a microdissection and microcloning method. Dosage analysis proved three of 144 randomly selected microclones to detect hemizygosity in two patients with DGS. Two of the clones were found to contain independent low-copy-number repetitive sequences, all of which were included in the region deleted in the DGS patients. Screening of the cosmid library and subsequent cosmid walking allowed us to obtain two cosmid contigs corresponding to the microclones within the deletion (contig 1 and contig ...
8-base recognition sites will yield pieces 64,000 bases long. Since hundreds of different restriction enzymes have been characterized, DNA can be cut into many different small fragments. Physical Maps Different types of physical maps vary in their degree of resolution. The lowest- resolution physical map is the chromosomal (sometimes called cytogenetic) map, which is based on the distinctive banding patterns observed by light microscopy of stained chromosomes. A cDNA map shows the locations of expressed DNA regions (exons) on the chromosomal map. The more detailed cosmid contig map depicts the order of overlapping DNA fragments spanning the genome. A macrorestriction map describes the order and distance between enzyme cutting (cleavage) sites. The highest- resolution physical map is the complete elucidation of the DNA base- pair sequence of each chromosome in the human genome. Physical maps are described in greater detail below. Low-Resolution Physical Mapping Chromosomal map. In a chromosomal ...
Empirical Bioscience announced the introduction of a new Plasmid Mini-Prep Kit today. Requiring only 1-3mL of bacterial culture, the kit isolates high-quality plasma or cosmid DNA for extraction up to 10 kb in length and yields up to 20 µg per preparation.. In addition to using smaller volumes of cultures, the kit also features an integrated pH indicator within the lysis buffer. This indicator changes color to bright yellow when the lysis buffer reaches the optimal pH level for DNA binding, 7.5. If the pH is greater than 7.5 the lysis buffer will appear orange or violet in color indicating that the pH level is inefficient for DNA adsorption, allowing researchers to make adjustments to the mixture for more efficient plasmid isolation.. Besides the color changing lysis buffer, the kit includes, neutralization buffer, Rnase A, activation buffer, washing buffer, elution buffer, spin columns and collection tubes. These components create a versatile kit that lends itself well for use in ...
The data section can follow or proceed the configuration section. The two sections can also be intermixed. The data section is a tab or whitespace-delimited file which you can export from a spreadsheet application or word processor file (be sure to save as text only!). Here is an example data section:. Cosmid B0511 . 516-619 Cosmid B0511 . 3185-3294 Cosmid B0511 . 10946-11208 Cosmid B0511 . 13126-13511 Cosmid B0511 . 66-208 Cosmid B0511 . 6354-6499 Cosmid B0511 . 13955-14115 EST yk595e6.5 + 3187-3294 EST yk846e07.3 - 11015-11208 EST yk53c10 yk53c10.5 + 18892-19154 yk53c10.3 - 15000-15500,15700-15800 EST yk53c10.5 + 16032-16105 SwissProt PECANEX + 13153-13656 Swedish fish FGENESH Gene 1 - 1-205,518-616,661-735,3187-3365,3436-3846 Transmembrane domain FGENESH Gene 2 - 16626-17396,17451-17597 Kinase and sushi domains. Each line of the file contains five columns. The columns are:. ...
Cosmid clones containing alpha 1-antitrypsin (alpha 1AT) gene sequences were observed to contain alpha 1AT-like sequences approximately 12 kb downstream of the authentic alpha 1AT gene. Restriction mapping suggested the alpha 1AT-like gene lacks promoter sequences. Cosmid clones from one library con …
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TY - JOUR. T1 - Detection of submicroscopic chromosomal deletions in aniridia patients using fluorescence in situ hybridization and a panel of cosmids covering the WT1 gene. AU - Kempski, H.. AU - Cowell, J. K.. PY - 1993/1/1. Y1 - 1993/1/1. N2 - A series of cosmids have been isolated from a human chromosome 11-specific cosmid library using the human Wilms tumour predisposition gene cDNA, WT33. Seven overlapping cosmids were isolated which cover the genomic sequence of WT1 and in situ hybridisation shows that they all localise to the p13 region of chromosome 11. Chromosomes from patients with aniridia and Wilms tumour, and a small subband deletion in 11p13, were analysed and no hybridisation signal was seen on the deletion chromosomes. These cosmids, therefore, can be used to analyse chromosomes from patients with sporadic aniridia for submicroscopic deletions. Aniridia patients who show normal hybridisation patterns on both chromosomes need no longer be screened for Wilms tumours.. AB - A ...
The I-2 locus in tomato confers resistance to race 2 of the soil-borne fungus Fusarium oxysporum f sp lycopersici. The selective restriction fragment amplification (AFLP) positional cloning strategy was used to identify I-2 in the tomato genome. A yeast artificial chromosome (YAC) clone covering ~750 kb encompassing the I-2 locus was isolated, and the AFLP technique was used to derive tightly linked AFLP markers from this YAC clone. Genetic complementation analysis in transgenic R1 plants using a set of overlapping cosmids covering the I-2 locus revealed three cosmids giving full resistance to F. o. lycopersici race 2. These cosmids shared a 7-kb DNA fragment containing an open reading frame encoding a protein with similarity to the nucleotide binding site leucine-rich repeat family of resistance genes. At the I-2 locus, we identified six additional homologs that included the recently identified I-2C-1 and I-2C-2 genes. However, cosmids containing the I-2C-1 or I-2C-2 gene could not confer ...
Empirical Bioscience announced the introduction of a new Plasmid Mini-Prep Kit today. Requiring only 1-3mL of bacterial culture, the kit isolates high-quality plasma or cosmid DNA for extraction up to 10 kb in length and yields up to 20 µg per preparation. In addition to using smaller volumes of cultures, the kit also features an integrated pH indicator within the lysis buffer. This indicator changes color to bright yellow when the lysis buffer reaches the optimal pH level for DNA binding, 7.5. If the pH is greater than 7.5 the lysis buffer will appear orange or violet in color indicating that the pH level is inefficient for DNA adsorption, allowing researchers to make adjustments to the mixture for more efficient plasmid isolation. Besides the color changing lysis buffer, the kit includes, neutralization buffer, Rnase A, activation buffer, washing buffer, elution buffer, spin columns and collection tubes. These components create a versatile kit that lends itself well for use in ...
A series of 130 DNA probes, hybridized to the CIC YAC library, are ordered along the abscissa. A subset of 58 of the probes, mapped to chromosome 2 by RFLP analysis, serve as contact points between the genetic and physical maps. The positions of markers mapped to the recombinant inbred lines (7) are indicated in cM above the marker names. When a set of probes hybridized to the same YACs, their order is listed by their position in the genetic map (7). If no genetic or auxilliary data (e.g. cosmid contig (4)) was available, the exact probe order is indeterminate and is arbitrarily assigned.. A line drawn above a marker indicates a difference in marker order between the physical and genetic maps. Markers designated RI have been mapped by us to the recombinant inbred populations and are in correct relative position (with one exception, 15414, marked RI-?) to the markers on either side (no number is indicated as adding markers and using a different mapping program generates different absolute ...
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Brian Robertson wrote: , , The amount of bacterial genome data available as sequenced cosmids of , 30-40 kb is increasing rapidly. Our problem is that we need to keep track , of newly discovered genes as they appear, so they can be incorporated into , our research program as appropriate. For this we need to create lists of , probable genes identified in the annotations for each cosmid. This can , then be circulated to laboratory workers. , , An example of this kind of annotation is shown below. We would like to , extract the /note field, which contains the probable function of the , gene, and create a list of these for each cosmid. , , FT CDS_pept complement(3043..4155) , FT /note=MTCY190.03c, probable anthranilate , FT phosphoribosyltransferase, trpD, len: 370, similar to eg , FT SW:TRPD_LACCA P17170, (43.2% identity in 308 aa overlap), , FT initiation codon uncertain, gtg at 4086 favoured by , FT homology but this has no clear ribosome binding site , , Does anyone know of a way of ...
The kits utilize a novel strategy of cloning end-repaired, randomly sheared DNA instead of the conventional approach of cloning fragments generated by partial restriction endonuclease digestion. First, genomic DNA is sheared by passing it through a syringe needle. The sheared DNA is end-repaired to generate 5-phosphorylated blunt ends and size-selected using a low melting point agarose gel. The size-selected DNA is then ligated into the supplied linearized and dephosphorylated pWEB-TNCTM or pWEBTM Cosmid Vector, packaged using ultra-high efficiency MaxPlaxTM Lambda Packaging Extracts (,109 pfu/μg for phage lambda) and plated on phage T1-resistant EPI100TM-T1R E. coli plating cells, all included in the kit. The result is a complete and unbiased primary cosmid library ...
The kits utilize a novel strategy of cloning end-repaired, randomly sheared DNA instead of the conventional approach of cloning fragments generated by partial restriction endonuclease digestion. First, genomic DNA is sheared by passing it through a syringe needle. The sheared DNA is end-repaired to generate 5-phosphorylated blunt ends and size-selected using a low melting point agarose gel. The size-selected DNA is then ligated into the supplied linearized and dephosphorylated pWEB-TNCTM or pWEBTM Cosmid Vector, packaged using ultra-high efficiency MaxPlaxTM Lambda Packaging Extracts (,109 pfu/μg for phage lambda) and plated on phage T1-resistant EPI100TM-T1R E. coli plating cells, all included in the kit. The result is a complete and unbiased primary cosmid library ...
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From a cosmid gene bank of Bacillus cereus GP4 in Escherichia coli we isolated clones which, after several days of incubation, formed hemolysis zones on erythrocyte agar plates. These clones contained recombinant cosmids with B. cereus DNA insertions of varying lengths which shared some common restriction fragments. The smallest insertionwas recloned as aPstl fragment into pJKK3-1, a shuttle vector which repücates in Bacillus subtilis and E. coli. When this recombinant plasmid (pJKK3-1 hly-1) was transformed into E. coli, it caused hemolysis on erythrocyte agar plates, but in liquid assays no extemal or intemal hemolytic activity could be detected with the E. coli transformants. B. subtilis carrying the same plasmid exhibited hemolytic activity at Ievels comparable to those ofthe B. cereus donor strain. The hemolysin produced in B. subtilis seemed to be indistinguishable from cereolysin in its sensitivity to cholesterol, activation by dithiothreitol, and inactivation by antibodies raised ...
Fosmids are similar to cosmids but are based on the bacterial F-plasmid. The cloning vector is limited, as a host (usually E. coli) can only contain one fosmid molecule. Fosmids can hold DNA inserts of up to 40 kb in size; often the source of the insert is random genomic DNA. A fosmid library is prepared by extracting the genomic DNA from the target organism and cloning it into the fosmid vector. The ligation mix is then packaged into phage particles and the DNA is transfected into the bacterial host. Bacterial clones propagate the fosmid library. The low copy number offers higher stability than vectors with relatively higher copy numbers, including cosmids. Fosmids may be useful for constructing stable libraries from complex genomes. Fosmids have high structural stability and have been found to maintain human DNA effectively even after 100 generations of bacterial growth. Fosmid clones were used to help assess the accuracy of the Public Human Genome Sequence. The fertility plasmid or F-plasmid ...
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