The common clinical features reported in ring chromosome 22 cases include overall developmental delay with severe speech disability, growth retardation with frequently associated microcephaly, hypotonia, and dysmorphic traits, such as epicanthus, normally placed but large and dysplastic ears, long eyelashes with full eyebrows, and occasionally high arched palate, dental malocclusion, and mild h...

The Drosophila oocyte develops within a cyst of 16 germline cells interconnected by ring canals. Polarized, microtubule-based transport of unknown determinants is required for oocyte formation, but whether polarity is established during or after cyst formation is not clear. We have analyzed how polarity develops in stem cells and dividing cysts by following the growth of the fusome, a vesiculat...

[1] Tree ring width data are among the best proxies for reconstructing past temperature and precipitation records. The discovery of fractal scaling and long-memory in meteorological and hydrological signals motivates us to investigate such properties in tree ring chronologies. Detrended fluctuation analysis and adaptive fractal analysis are utilized to estimate the Hurst parameter values of 697...

Variations in tree-ring structure are simulated with (1) an empirical model using monthly climatic data as statistical predictors and (2) a mechanisbc model using daily climatic data as growth limiting conditions. The empirical model calibrates standardized ring-width and density chronologies of tree-rings with monthly temperature, precipitation or Palmer Drought Severity Index. The empirical m...

The life cycle of bacterial cells consists of repeated elongation, septum formation, and division. Before septum formation, a division ring called the Z-ring, which is made of a filamentous tubulin analog, FtsZ, is seen at the mid cell. Together with several other proteins, FtsZ is essential for cell division. Visualization of strains with GFP-labeled FtsZ shows that the Z-ring contracts before...

Transverse coupled bunch instability was experimentally studied in low energy positron ring (LER) and high energy electron ring (HER) at KEKB. The oscillations of bunches were recorded by a bunch oscillation recorder for the total of 4096 turns. The data were analysed to obtain the mode distribution and the growth rate of oscillation. The result of the analysis is presented in this paper.

The identification of ring canal proteins and insight into ring canal biogenesis have been aided by characterization of a class of mutants in which the flow of cytoLynn Cooley Department of Genetics Yale Medical School New Haven, Connecticut 06520-8005 plasm into the oocyte is impaired (Robinson and Cooley, 1996). The ultimate phenotype of these mutants is striking: egg chambers produce drastic...

A boy with a ring 18 chromosome karyotype was referred because of short stature; he had growth hormone deficiency and possible hypogonadotrophic hypogonadism. Many children with major chromosomal abnormalities are short, but this case emphasises the need to consider growth hormone deficiency in addition.

Black ash (Fraxinus nigra) is a species used for basketmaking by several Native American Tribes in Eastern North America. In recent years, there has been a decline in availability of quality ‘basket trees’, and the purpose of this study was to determine what site characteristics allow for the growth of appropriate ring widths required for black ash splints used to make baskets. Three ecosystems...

A 39 year old male with multiple dysmorphic features was found to have an unstable ring chromosome 7. Clinical findings are presented and compared with the other five reported cases of ring chromosome 7. The main characteristics found in patients with this chromosome constitution are prenatal onset growth deficiency, bone anomalies, pigmentary or vascular skin changes, and ocular and genital an...