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Biomedical subjects

S J Berry

Publications and source records attributed to S J Berry.

53 records · Page 3Linked to original sources
PubMed1975

Formation of temporary flagellar structures during insect organogenesis.

Cilia and flagella are rare in nongerminal tissues of anthropods, and are generally thought to be restricted to sperm and sensory cells in insects (2). Whitten (5) has reported the presence of kinetosomes at the base of mitotrichia in the dipteran fly Sarcophaga bullata, but reports no evidence of the organization of fibrous elements characteristic of cilia and or flagella. During an ultrastructural analysis of morphogenesis of the colleterial gland of the silk moth Hyalophora cecropia, we found the first example of paired flagella associated with an insect secretory cell. These structures are also unusual in that they serve a temporary role in morphogenesis and subsequently disappear at the terminal stages of differentiation.

Animals↗
PubMed1973

Estimation of the half-life of a secretory protein message.

Synthesis of a specific secretory protein was followed in the presence of actinomycin D and cordycepin (3'-deoxyadenosine). The apparent half-life of the messenger RNA for this protein is significantly longer in the presence of actinomycin D than in the presence of cordycepin. These results suggest that actinomycin D studies of half-life in specialized cells may be inaccurate.

Animals↗
PubMedDate not supplied

A clinic on wheels. A paradigm shift in the provision of care and the challenges of information infrastructure.

The implementation of nontraditional healthcare delivery increases the need for information technology innovation, not only in use of computer-based patient records, but also in enabling infrastructures to support health information exchange. This is very apparent in mobile health clinics where care is provided to vulnerable community populations at locations far removed from academic and tertiary care settings. Several challenges of designing a computerized system for the University of Maryland School of Nursing's Wellmobile will be addressed in this article, as well as possible solutions to these challenges. It is the authors' belief that implications for further study will become apparent as these constraints and challenges are described.

Child↗
PubMedDate not supplied

Ultradian rhythmic models of blood pressure variation in normal human daily life.

To examine levels and variance structure of systolic blood pressure (SBP), diastolic blood pressure (DBP) and heart rate (HR), we measured those 3 variables every 7.5 min for 24 h (approximately 192 samples each subject) by ambulatory monitoring in 2 nominated groups of normal volunteers: younger (Y; 8 men, 5 women, 24-44 years) and older (O; 13 men, 12 women, 50-95 years). Y and O did not differ in either sleep or wake means for HR and DBP. Mean SBP in O was 17 mm Hg higher than in Y during wakefulness. Thirty-four subjects had significant low frequency variations (presumably the circadian rhythm) in SBP, DBP and HR, regardless of age. A periodic model fitting the time series required a 9 h feature (rhythm) for Y and O in DBP for best reduction of mean square error. In addition, O regularly showed 3 h features in both SBP and DBP, a 6 h feature in DBP and a 9 h feature in SBP, which were absent in Y. Our results suggest that low-power ultradian rhythms may appear in both SBP and DBP after age 50, and possibly serve as dynamic markers of normal cardiovascular aging.

Activity Cycles↗