pleted, the cold-core region was expected to have higher biological stocks as a result of locally higher primary production. Both ABI and net tow data confirmed that the cold-core region was in fact a zone of local aggregation of zooplankton and micronekton. During both day and night, ABI when integrated for the upper 50 and 100 m in the cold-core region was significantly greater than in the LC or in the LCE, and ABI was positively correlated with standing stock biomass taken by the net tows. Further investigations into the biological differences between Gulf of Mexico divergence and convergence regimes are warranted, and the ADCP will be a useful tool for examination of the distribution of sound scatterers in such features.
Two infants with chromosome 22q11 deletion syndrome were noted to have symmetrically enlarged Sylvian fissures on cranial MRI. We compared the size of the Sylvian fissures in neuroimaging studies from 17 other subjects with del 22q11 to age-matched disease controls. The mean anterior interopercular distance was used as an index of Sylvian fissure enlargement. Symmetric enlargement of the Sylvian fissures was present in 10 of 17 subjects with del 22q11. The age-incidence pattern, as well as follow-up scans in 2 patients, suggests delayed growth of the opercular region in these patients. Subjects with del 22q11 consistently had disproportionate enlargement of the left Sylvian fissure compared to the right. This observation suggests that a gene (or genes) in the deleted region affects the development of the left and right perisylvian cortex in different ways. Abnormal development of the operculum may explain some of the neurodevelopmental features that are common among individuals with 22q11 deletion syndrome.
Rocks of the Goshute-Toano Range, Elko County, Nevada, between White Horse Pass on the south and Silver Zone Pass on the north, record a complex Mesozoic and Tertiary history of metamorphism, contractional and extensional deformation, and igneous activity. Paleozoic strata comprise seven distinctive structural tracts, separated from each other by low-or high-angle faults. These tracts are grouped here into three structural-thermal levels separated by low-angle faults: (1) a lower level of Cambrian to Mississippian sedimentary rocks that were strongly folded and metamorphosed in Mesozoic time, (2) a middle level of Cambrian to Mississippian, nonmetamorphosed sedimentary strata that were heated moderately, weakly folded, thinned by bedding-parallel faults, and segmented by high-angle faults, and (3) an upper level of Pennsylvanian, Permian, and younger rocks that were heated only slightly and, over large areas, were broken up, tilted, and dispersed by normal faulting in Miocene time. Lower-level rocks were intruded in Middle Jurassic time by a granodiorite stock that transected metamorphic fabric. Middle-level strata were intruded in the Late Jurassic by granite bodies of extremely irregular shape and in Late Jurassic to middle Miocene time by stocks, dikes, and sills. Upper-level strata lack outcrops of intrusive rocks of any kind. Extensive Miocene rhyolite flows cover parts of middle-and upper-level strata. The Goshute-Toano Range is replete with welldeveloped examples of contractional and superposed extensional structures and offers abundant opportunities for potentially very productive detailed structural studies.
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