The fall, recovery, orbit, and composition of the Tagish Lake meteorite: a new type of carbonaceous chondrite.

The preatmospheric mass of the Tagish Lake meteoroid was about 200,000 kilograms. Its calculated orbit indicates affinity to the Apollo asteroids with a semimajor axis in the middle of the asteroid belt, consistent with a linkage to low-albedo C, D, and P type asteroids. The mineralogy, oxygen isotope, and bulk chemical composition of recovered samples of the Tagish Lake meteorite are intermediate between CM and CI meteorites. These data suggest that the Tagish Lake meteorite may be one of the most primitive solar system materials yet studied.

Does perinatal phenobarbital exposure affect developmental outcome at age 2?

The objective of this paper is to determine if phenobarbital exposure during pregnancy affects developmental outcome at age 2 years. Between 1991 and 1994, 401 pregnant patients at risk for delivery prior to 34 weeks' gestation were invited to participate; 48 mothers declined entry. Before delivery, pharmacy randomized the pregnant women to receive phenobarbital and vitamin K or identically appearing placebo in a blinded fashion. Developmental follow-up at age 2 years was performed. Children from the treatment group scored significantly lower on the Bayley Mental Developmental Index (mean MDI +/- 1 SD) than children whose mothers were randomized to the placebo group [104 +/- 21 (n = 59) vs. 113 +/- 22 (n = 62), p = 0.023]. Of 36 independent variables, randomization group was one of five that individually contributed to the prediction of the Bayley MDI score (p < 0.05). It was concluded that perinatal phenobarbital therapy may impair developmental outcome.

A comparison of newborns' NBAS reflex responses using total and individual scores. Neonatal Behavioral Assessment Scale.

The purpose of this study was to compare results found using a total summative score of abnormal reflex responses with the results found using individual reflex scores. The 20 reflexes included as part of the Brazelton Neonatal Behavioral Assessment Scale (NBAS) were assessed on 196 neonates on the 1st and 2nd days postnatally. Differences due to of type of delivery, birth weight, whether their mothers were insulin-dependent diabetics or nondiabetics, and day of testing were assessed by using analysis of variance. The key results were that all effects found using the total reflex score were replicated with individual reflex scores and that individual reflex scores also revealed effects not shown using the total score. It was concluded that the individual reflex scores, rather than the total score, should be used when evaluating newborn reflex performance.

Early recognition of autism. Parental reports vs clinical observation.

OBJECTIVE: To determine which behavioral characteristics of autism are apparent in early childhood and to examine the relative contributions of clinical observation and parental reports to early identification of autism. DESIGN: Blinded comparison of behavioral data obtained through parental reports and clinical observation. SETTING: Child development referral center. PATIENTS: Twenty-six children (23 boys and three girls) younger than age 48 months with a clinical diagnosis of autism. SELECTION PROCEDURES: Consecutive sample. INTERVENTIONS: None. MEASUREMENTS AND RESULTS: Social interaction, communication, and activities and interests were evaluated using standard diagnostic criteria for autism. Results suggested that deficits in the areas of social interaction, imitation, play, and nonverbal communication are more prominent than insistence on sameness and routines in young children with autism. Also, parental reports and clinical observation appear to detect different aspects of abnormal behavior patterns in this sample. CONCLUSIONS: Improved awareness of the early signs of autism should help physicians recognize this disorder in a timely manner. Further research may identify how observation of play and parental reports might be incorporated efficiently into a physician's repertoire of developmental and behavioral screening tools.

Birth weight less than 800 grams: changing outcomes and influences of gender and gestation number.

Mortality and neurodevelopmental morbidity were compared in two cohorts of neonates with birth weights of less than 800 g. The neonates, born in the years 1977 through 1980 (original cohort) and 1983 through 1985 (current cohort), were patients in the same university intensive care nursery. Mortality was 80% in the original cohort and 64% in the current cohort (P = .01). In the current cohort, survival was significantly better for neonates with birth weights of more than 749 g (58% vs 27%; P = .001). Survival was also significantly associated with gender and with gestation number (female survival was 48% and male survival was 23%, P = .003; singleton survival was 41% and twin survival was 21%, P = .03). Prevalence of major central nervous system handicaps did not significantly differ between the two study groups, but severity of handicap was worse for the current study group. Morbidity in the current cohort was most severe for twins (67% with a major central nervous system handicap) and was least severe for singleton girls (4% with a major central nervous system handicap, P = .002). Delivery mode appeared to affect outcome. Although there were more nursery admissions and more survivors among neonates with birth weights of less than 800 g during the period 1983 through 1985 compared with the period 1977 through 1980, overall neurodevelopmental morbidity worsened.

Sarcoidosis presenting as acute myositis. Report and review of the literature.

A patient with sarcoidosis who presented with acute inflammatory myopathy is described. The patient had no symptoms other than those of the muscle involvement, with elevated serum levels of creatine kinase. Muscle biopsies revealed epithelioid granulomas, consistent with sarcoidosis. There was a dramatic response to a moderate dose of corticosteroids, but relapse occurred after the dose was tapered. We suggest that sarcoidosis be considered in the differential diagnosis of inflammatory myopathy, and that patients with acute sarcoid myositis be maintained with at least a moderate dose of corticosteroids for at least 6 months.

Quantitation of complex brain function in children: preliminary evaluation using a nonhuman primate behavioral test battery.

The performance of twenty children (3-11 years of age) in a complex operant test battery (OTB) was evaluated. The operant schedules, or tasks, used in the OTB were identical to those originally designed and currently used to assess complex brain function in nonhuman primate laboratory animals (monkeys). The OTB consisted of five operant tasks: 1) Progressive-Ratio [PR]; 2) Conditioned-Position Responding [CPR]; 3) Temporal Response Differentiation [TRD]; 4) Delayed Matching-to-Sample [DMTS] and 5) Incremental Repeated Acquisition [IRA]. These operant tasks are thought to engender responding indicative of processes associated with: 1) motivation; 2) color and position discrimination; 3) time-perception; 4) short-term memory and attention; and 5) learning, respectively. The parameters for each of the tasks in the OTB were optimized for use in the clinical setting to assess cognitive function in children. In the small population studied, performance in the IRA, DMB and TRD tasks was age related. Of the four 6-yr-olds studied, only those categorized as having either learning disabilities (LD, n = 1) or attention deficit disorders (ADD, n = 2) did not complete the "learning" task. By comparison of human and monkey performance in the OTB, we also hope to validate the use of laboratory animal models in research efforts designed to yield insight into complex human brain function. It is also hoped that assessment of children's performance in the tasks in the OTB will assist in the diagnosis and treatment of certain childhood disorders such as learning disabilities and/or attention deficit disorders.