Search PubMed⌕ Search

Biomedical subjects

M J Klein

Publications and source records attributed to M J Klein.

172 records · Page 10Linked to original sources
PubMedDate not supplied

Status of the NASA SETI Sky Survey microwave observing project.

The Sky Survey observing program is one of two complementary strategies that NASA plans to use in its microwave Search for Extraterrestrial Intelligence (SETI). The primary objective of the Sky Survey is to search the entire sky over the frequency range 1000-10,000 MHz for evidence of narrow band signals of extraterrestrial, intelligent origin. Spectrum analyzers with upwards of 10 million channels and data rates in excess of 10 gigabits per second are required to complete the survey in less than 7 years. To lay the foundation for the operational SETI Sky Survey, a prototype system has been built to test and refine real time signal detection algorithms, to test scan strategies and observatory control functions, and to test algorithms designed to reject radio frequency interference. This paper presents a high level description of the prototype hardware and software and reports on the preparations to deploy the system to the 34-m antenna at the research and development station of NASA's Deep Space Communication Complex, Goldstone, California.

Communication↗
PubMedDate not supplied

[The effect of adrafinil on the nocturnal activity of the rhesus monkey (Macaca mulatta)].

The nocturnal activity of a primate was used as an evaluation criterium for a stimulating substance: adrafinil (CRL 40028). Ten rhesus monkeys were placed in a controlled environment and their activity was measured, in relative time, using an ultra-sound system. The animals repeatedly received 60, 90 and 120 mg X kg-1 adrafinil per os. Globally, the dose of 60 mg X kg-1 doubled the animals' nocturnal activity whereas 90 and 120 mg X kg-1 increased it fourfold, the activity level becoming practically identical to diurnal activity. The effects of 60 mg X kg-1 were only significant after the second treatment whereas doses of 90 and 120 mg X kg-1 were already significantly efficient after the first administration. A stimulating effect persisted approximately 36 hrs after the second treatment with 90 or 120 mg X kg-1. No sedative effect of recovery was observed during the posttreatment phase.

Animals↗
PubMedDate not supplied

An unusual cause of knee locking: a case report.

Intra-articular tumors of the knee joint causing intermittent locking are extremely rare. A 39-year-old woman with the complaint of joint locking had a pedunculated intra-articular mass and nodular synovitis.

Adult↗
PubMedDate not supplied

Short stature in children and adults with neurofibromatosis.

Height characteristics in 108 children and 52 adults with neurofibromatosis (NF) were analyzed. Fifty percent of the children and 54% of the adults ranked below the 25th percentile for normal age and sex-adjusted height. It can be concluded that children with NF are short and have increased risk of becoming very short adults. Primary care practitioners and specialists working with these children should recognize the possibility of future short stature and initiate measures to prevent or minimize the psychosocial problems that may result. Given the pronounced risk for shortness, it is important to avoid unrealistic adult height predictions (based on parental stature) when counseling short children with the disease.

Adolescent↗