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• Incomplete reactivation of Oct4-related genes in mouse embryos cloned from somatic nuclei .
• Mouse embryos that lack an Oct4 gene, which plays an essential role in control of developmental pluripotency, develop to the blastocyst stage and also die after implantation, because they lack pluripotent embryonic cells. Based on this similarity, we posited that cloned embryos derived from differentiated cell nuclei fail to establish a population of truly pluripotent embryonic cells because of faulty reactivation of key embryonic genes such as Oct4. ... In contrast to this incomplete reactivation of Oct4-related genes in somatic clones, ES cell-derived cloned blastocysts and normal control embryos expressed these genes normally. ...
• Homozygous mutant embryos lacking Oct4 (Pou5f1 – Mouse Genome Informatics), a gene that encodes a POU-domain transcription factor that has an essential role in the control of developmental pluripotency, form morphologically normal but developmentally deficient blastocysts (Nichols et al. ... In particular, the cells of Oct4-deficient embryos fail to form the inner cell mass (ICM) that gives rise to all adult tissues (Nichols et al. ... The superficially normal development of Oct4-deficient embryos to the blastocyst stage suggests that the combined activity of maternal, zygotic and housekeeping genes might be sufficient to produce a phenocopy of normal preimplantation development. The subsequent failure of embryonic cells in the blastocyst to form the epiblast leads to the manifestation of developmental defects observed in Oct4-deficient embryos. ...
• We have examined the hypothesis that the limited developmental potency of cloned embryos is a result of incomplete reactivation of genes that, like Oct4, function specifically in pluripotent embryonic cells. To test this hypothesis, we have identified 10 candidate genes with an expression pattern similar to Oct4 (designated as Oct4-related genes in this paper) and have compared expression of these genes in normal preimplantation embryos to embryos cloned from somatic cumulus cells and pluripotent ES cells. ...
• We examined biological source descriptions of all cDNA libraries that contribute to the UniGene mouse dataset and identified 105 cDNA libraries of interest prepared from pre-implantation embryos, gastrulating embryos, embryonic and adult gonads, posterior regions of early and late gestation embryos that also contained developing gonads and germ cells, and ES and embryonic carcinoma (EC) cells. ...
• Finally, we assessed the reproducibility of detection of candidate genes in single preimplantation embryos and chose 10 Oct4-related genes for further analysis. ...
• Embryos were collected in 100 µl of TRIzol reagent (GibcoBRL) in non-stick, RNAse-free microtubes (Ambion), extracted twice with 20 µl of chloroform using Phase Lock Gel Heavy 0. ...
• Epiblasts of early gastrulation embryos were dissected cleanly from extra-embryonic tissues. Embryonic gonads were collected from E12 embryos of both sexes by carefully dissecting them from mesonephroi. ...
• Production of cloned embryos from cumulus and ES cell nuclei.

• Glycine transport by single human and mouse embryos .
• Mouse zygotes and early cleavage-stage embryos have previously been shown to utilize glycine as an organic osmolyte, accumulating it to oppose any decrease in cell volume. Such glycine uptake in early cleavage-stage mouse embryos is via the glycine-specific Gly transporter. Mouse embryos also possess swelling-activated channels which function to release osmotically active glycine and other osmolytes when cell volume becomes too large. In this study it was found that human cleavage-stage embryos also transported glycine via a similarly saturable, sarcosine-inhibitable transporter, implying that the Gly transporter also mediates glycine transport in human embryos. ... It was found in the current study that this ability was lost as preimplantation mouse embryo development proceeded, and that early cleavage-stage human embryos may also be capable of such osmosensitive accumulation of glycine. ... These data indicate that osmoregulation in early human embryos occurs via similar mechanisms as in the mouse. ...
• Mouse eggs and early cleavage-stage embryos, when freshly removed from the female genital tract, contain a high intracellular concentration of glycine relative to other -amino acids (Schultz et al. ... This high intracellular glycine concentration can be maintained in embryos during extended in-vitro culture only if exogenous glycine is included in the external medium (Van Winkle and Dickinson, 1995), indicating that transport of glycine into the egg or embryo is required. In eggs, zygotes and early cleavage-stage embryos of the mouse, it has been shown that uptake of glycine is mediated entirely by the Na+- and Cl–-dependent Gly transporter (Hobbs and Kaye, 1985, 1986, 1990; Van Winkle et al. ... The reliance of this transport system on the inwardly directed Na+ and Cl– gradients allows highly concentration-dependent uptake of glycine and the maintenance of steep concentration gradients across the cell membrane, permitting a high glycine content in eggs and early embryos, even when the extracellular concentration is much lower. ...
• The function of intracellular glycine in eggs and embryos is unknown. A portion of glycine taken up by mouse embryos is metabolized, principally into serine and alanine, or incorporated into macromolecules such as proteins (Hobbs and Kaye, 1985), but the largest proportion remains as free glycine (Schultz et al. ... Recently, glycine has been shown to function as an organic osmolyte in mouse embryos, providing intracellular osmotic support at the zygote and early cleavage stages (Van Winkle et al. ... Nor is it known whether embryos of other species, including humans, exhibit this phenomenon. ...
• However, mouse embryos do possess a separate mechanism for releasing osmotically active cytoplasmic compounds upon swelling. This mechanism relies upon swelling-activated anion channels evident in zygotes and early cleavage-stage mouse embryos (Kolajova and Baltz, 1999; also unpublished results), which closely resemble the volume-sensitive channels found in a wide range of cells. ... It has also been shown directly that early mouse embryos exhibit swelling-activated release of accumulated glycine and taurine (Dumoulin et al. ... , 1998), indicating that swelling-activated anion/osmolyte channels mediate organic osmolyte release from embryos. ...

• Heart rate and heart rate variability in chicken embryos at the end of incubation .
• Our immediate goal was to study heart rate variability (HRV) in chicken embryos in the egg. ...

• Diguanosine nucleotide metabolism and the survival of artemia embryos during years of continuous anoxia .
• Encysted embryos of the primitive crustacean, Artemia franciscana, are remarkably resistant to a variety of harsh environmental conditions, including continuous anoxia for periods of years at physiological temperatures and water contents. Previous study produced no evidence of an ongoing anoxic metabolism, suggesting that these embryos remained viable in spite of the lack of detectable free energy flow and biosynthesis. That seeming violation of a major axiom of cell biology and biochemistry prompted us to re-examine the nucleotide pool of encysted embryos during prolonged anoxia. ... Studies on other nucleotides and associated enzymes, including results from previous papers, provide a plausible metabolic pathway leading to the provision of ATP and GTP to meet the needs of endergonic processes in anoxic embryos. ...
• The ultimate in anoxia-induced MRD occurs in encysted embryos of the primitive crustacean, Artemia franciscana. Under physiological conditions of cellular water content and temperature, about 60% of these embryos remain viable after four years of continuous anoxia 5 ; almost seven years were required to kill all of them 6 . ... In other words, these anoxic embryos should quickly die, but they do not, raising the issue of how they maintain themselves for such long periods under these extraordinary conditions. ...
• Trehalose and p26 are unquestionably important parts of the impressive adaptive repertoire of these embryos about which much is known 19-24 . ... One potentially useful direction came from work performed almost 30 years ago on the very large and diverse guanosine nucleotide pool of encysted embryos 25 . ... Evidence will be presented here for a plausible metabolic pathway by means of which the free energy of this compound can be made available to meet the needs of energy-requiring processes which, interestingly enough, are not easily identified in anoxic embryos. ...
• Dried encysted embryos (often called ‘cysts’) of Artemia franciscana from the South San Francisco Bay salterns were purchased from San Francisco Bay Brand, Hayward, California. ... These encysted embryos are at the gastrula stage, composed of about 4000 cells (nuclei) surrounded by a complex shell, and their ultrastructure has been described 6,30 including embryos that have experienced long-term anoxia 31 . ... About 90% of control embryos (before anoxia) produced swimming nauplius larvae when hydrated and incubated in aerobic seawater at room temperature ( 22 °C). ...
• Dried embryos were hydrated under anoxic conditions 5 : about 75 mg dry wt were placed in 8 mL screw-capped glass vials, to each of which was added 6 mL of 0. ... In one experiment, hydrated embryos were first incubated in aerobic seawater for 10 h at 25 C, then in anoxic seawater for up to 12 h, taking samples for analysis at 2–3 h intervals. ...

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• Cloned embryos also exhibited extensive loss of allele-specific DNA methylation at the imprinting control regions of the H19 and Snprn genes. Thus, epigenetic errors arise very early in clonal development in the majority of embryos, indicating that reprogramming is inefficient and that some epigenetic information may be lost. ...
• Recent studies of cloned embryos during preimplantation development have revealed striking defects, indicating that cloned embryos do not faithfully recapitulate many of the essential early events of normal development. Cloned embryos exhibit defects in the expression of key regulatory genes such as Oct4, a POU domain, class 5, transcription factor 1 8 . These embryos display dramatic alterations in culture-medium preferences with a shift toward somatic cell characteristics, indicating a lack of nuclear reprogramming in genes affecting basic physiology and metabolism 9 . Cloned preimplantation embryos also exhibit defects in demethylation processes, including global demethylation and demethylation of some repetitive elements 10–13 . Finally, cloned embryos aberrantly express the somatic form of the DNA methyltransferase protein, DNMT1, and are inefficient at nuclear uptake of the maternally inherited oocyte form 14 . ...
• One way to address the ability of cloned embryos to reprogram epigenetic information is to elucidate the fate of imprinted gene modifications during clonal development. ... To our knowledge, no study thus far has examined imprinting during the earliest stages of clonal development to determine how epigenetic information in cloned embryos may be affected or assessed allele specificity of imprinted gene expression in conjunction with DNA methylation analyses in somatic cell cloned embryos. ...
• For this analysis, we developed novel methods to assay imprinted gene methylation using small numbers of embryos and to assay parental allele expression of multiple genes at the single-embryo level. ... Our results indicate that cloned blastocysts rarely, if ever, display normal expression patterns of imprinted genes, even in morphologically high-quality cloned embryos. ...
• Generation of Clones and Control Embryos.
• Cloned embryos were generated as described previously 9 . ... Tetraploid control embryos were produced by injecting nuclei into intact eggs. Parthenogenetic control embryos were obtained by activation of intact oocytes in the same manner. Cloned, parthenogenetic, and tetraploid embryos were cultured at 37°C in an atmosphere of 5% CO2 in air 6 . Fertilized embryos were cultured in 5% CO2, 5% O2, and 90% N2. ... Embryos were cultured continuously in CZB plus glucose or initially in Whitten medium or in KSOM (for potassium simplex-optimized medium with increased salt concentrations) without amino acids, then switched at the eight-cell stage to KSOM augmented with amino acids. ...

• RNA sorting in Drosophila oocytes and embryos .
• RNA sorting in Drosophila oocytes and embryos. ...
• Therefore, females homozygous for bcd or nos mutations produce embryos that lack anterior or posterior body elements, as they cannot deposit functional copies of these essential RNAs into their eggs during oogenesis. ...
• Endogenous Stau is recruited specifically onto injected bcd 3' UTR RNA in embryos; after 30 min, Stau is found in particles of up to 1 µm in diameter, which also contain bcd 3' UTR RNA. ...
• Introduction of an osk transgene lacking BREs (oskBRE-) into females results in production of embryos with anterior deletions or bicaudal embryos, particularly when endogenous osk activity is removed by osk mutation or by a mutation in a gene required for osk RNA localization (capu, spir, mago). ...
• Another kinesin-like-protein, Klp38B, has been implicated genetically as possibly involved in pole plasm formation at the posterior of the oocyte, although the pattern of distribution of this protein in oocytes or embryos has not been determined (88). ...
• cad mRNA is translationally repressed by Bcd; thus, the initially uniformly distributed cad mRNA is translated in a posterior-to-anterior gradient in early embryos 10, 11). ...
• Among the RNAs that accumulate at the posterior pole of cleavage-stage embryos is mitochondrial large ribosomal RNA (mtlrRNA). ... Injection of targeted ribozymes directed against mtlrRNA into the pole plasm of cleavage-stage embryos greatly reduces their ability to form pole cells (100). ...
• Accumulation of these RNAs in the pole plasm requires the activities of genes such as osk, vas, and tud (95) , and mtlrRNA also accumulates in the ectopic pole plasm formed at the anterior pole of embryos produced by osk-bcd 3' UTR females (102). ...
• Apical localization of pair-rule gene transcripts in syncytial blastoderm embryos.
• An analysis of ftz RNA distribution in aneuploid embryos completely lacking each of the five major chromosome arms indicates that the necessary trans-acting factors for apical localization are maternally encoded (104). Furthermore, embryos lacking chromosome arm 3L have multiple layers of nuclei. ...
• The relative importance of RNA localization and translational control in later oogenesis and cleavage-stage embryos also remains unclear, although here the evidence seems convincing that translational activation of at least osk and nos RNAs requires their localization to the pole plasm. ...
• A key recent finding that is likely to contribute to our understanding of the interplay between microfilaments and microtubules in RNA localization is a report that a protein homologous to the class VI unconventional myosin CLIP-170 accumulates at the posterior pole of Drosophila embryos (109). ...
• Binding of pumilio to maternal hunchback mRNA is required for posterior patterning in Drosophila embryos. ...

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