985 resultados para 40-362
Resumo:
Dark brown sediment with small to large sized clasts. The clasts are sub-angular to sub-rounded in shape. Lineations are the most abundant. Minor amounts of rotation structures and comet structures can also be seen. Grain crushing is also present throughout the sample.
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Multiple domains are present. Clasts range from small to large in size and sub-angular to sub-rounded in shape. The fine grained domain is dark brown with some lineations and organic material. The coarse grained domain is grey in colour and contains mainly lineations and rotation structures. Some comet structures can also be seen.
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Grey sample with clasts that range from small to medium in size. The clast shape ranges from angular to sub-rounded. It mainly contains lineations and grain crushing. A few comet structures are also visible throughout the sample.
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Brown sediment with clasts ranging from small to medium in size. The clast shape ranges from sub-angular to sub-rounded. Grain crushing is abundant throughout the sample, and mainly involves medium sized clasts. Lineations can also be seen. A finer, and darker brown domain is also present within the sample.
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Brown sediment with grains ranging from small to medium in size. The sample mainly contains smaller clasts. Clast shape ranges from sub-angular to sub-rounded. Water escape structures and lineations can be seen in this sample. Grains stacking and comet structures are also present in minor amounts.
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Brown sediment with areas of clay rich material (darker brown). Clasts range from small to large in size. Clast shape ranges from angular to rounded. Rotation structures and necking structures were abundant in this sample. Some lineations and grain stacking can also be seen throughout the sample.
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Brown sediment with clasts ranging from small to medium in size. Clast shape ranges from angular to sub-rounded. Lineations are common in this sample along with grain crushing. A few comet structures can also be seen.
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Dark brown sediment with clasts ranging from small to large in size. Clast shape ranges from angular to sub-rounded. Lineations and comet structures can commonly be seen throughout the sample. Some rotation structures and grain crushing can also be seen in varying amounts.
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Brown, fine grained sediment. Clasts are small. Some organic material can be seen (darker). Lineations are common throughout the sample.
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Brown sediment with clasts ranging from small to medium in size. Clast shape ranges from angular to sub-rounded. Lineations are the most abundant microstructure, but this sample also includes some comet and rotation structures as well.
Resumo:
Brown sediment with clasts ranging from small to large in size. The clast shape ranges from sub-angular to sub-rounded. Lineations are common throughout this sample. Comet structures and minor amounts of rotation structures can also be seen.
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Tesis (Maestría en Ciencias en Nutrición) UANL, 2014.
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Tesis (Maestría en Ciencias en Nutrición) UANL, 2014.
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Tesis (Doctor en Ingeniería con Especialidad en Materiales ) U.A.N.L.
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Human telomeres play a major role in stabilizing chromosome ends and preventing fusions. Chromosomes bearing a broken end are rescued by the acquisition of a new telomeric cap without any subtelomeric sequences being present at the breakpoint, a process referred to as chromosome healing. Conversely, a loss of telomeric function or integrity can lead to the presence of interstitial telomeres at the junction site in translocations or ring chromosomes. In order to determine the frequency at which interstitial telomeres or chromosome healing events are observed in target chromosome abnormalities, we conducted a retrospective FISH study using pan-telomeric and chromosome-specific subtelomeric probes on archival material from 40 cases of terminal deletions, translocations or ring chromosomes. Of the 19 terminal deletions investigated, 17 were negative for the subtelomeric probe specific to the deleted arm despite being positive for the pan-telomeric probe. These 17 cases were thus considered as been rescued through chromosome healing, suggesting that this process is frequent in terminal deletions. In addition, as two of these cases were inherited from a parent bearing the same deletion, chromosomes healed by this process are thus stable through mitosis and meiosis. Regarding the 13 cases of translocations and eight ring chromosomes, four and two cases respectively demonstrated pan-telomeric sequences at the interstitial junction point. Furthermore, two cases of translocations and one ring chromosome had both interstitial pan-telomeres and subtelomeres, whereas two other cases of ring chromosomes and one case of translocation only showed interstitial subtelomeres. Therefore, interstitial (sub)telomeric sequences in translocations and ring chromosomes are more common than previously thought, as we found a frequency of 43% in this study. Moreover, our results illustrate the necessity of performing FISH with both subtelomeric and pan-telomeric probes when investigating these rearrangements, as the breakpoints can be either in the distal part of the pan-telomeres, or in between the two types of sequences.