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Biomedical subjects

A L Berman

Publications and source records attributed to A L Berman.

At least 73 records · Page 4Linked to original sources
PubMed1975

The epidemiology of life-threatening events.

This paper explores the epidemiology and impact (both short- and long-term) of acute life-threatening experiences among a youthful population. Interviews were conducted with 649 individuals between the ages of 13 and 30. Thirty-four percent of these respondents reported a total of 290 analyzable, subjectively perceived death confrontation experiences. An estimate of over 2 1/2 million living ex-suicide attempters, under age 30, was derived, and suicide was found to be a significantly unique form of death confrontation. In contrast to earlier work, panic and fear were found significantly to describe the majority of impacts reported, while avoidance appears to be the modal long-term effect. Differential impacts and effects are reported by mode of event, and results are discussed in relation to their impact for crisis counseling.

Accidents↗
PubMed1975

[Localization of several rhodopsin regeneration enzymes in retinal rods].

The distribution of NAD kinase and glucose-6-phosphate dehydrogenase within membranes of both outer and inner retina rod segments was studied by the sucrose gradient centrifugation of crude outer segment preparations. Rhodopsin and retinoldehydrogenase served as markers for outer segment membranes, whereas succinate dehydrogenase was a marker for inner ones. It is shown that NAD kinase and glucose-6-phosphate dehydrogenase are localized within inner segment membranes of the photoreception cell and that the activity of these enzymes in the crude preparations is due to contamination of the inner segments.

Alcohol Oxidoreductases↗
PubMedDate not supplied

[Distribution of Na+, K+-ATPase and Mg+-ATPase in different subfractions of rod outer segments].

Na+, K+-ATPase and Mg++-ATPase are shown to be distributed non-uniformely in different subfractions of the rod outer segments (ROS) of bovine retina. Distribution of the enzymes differs significantly from that of rhodopsin. Predominant portion of Na+, K+-ATPase and Mg++-ATPase is concentrated within the subfractions with the lowest rhodopsin content. The most purified subfractions ROS containing the main amount of rhodopsin lack Na+, K+-ATPase at all, the activity of Mg++-ATPase does not exceed 0,4 plus or minus 0,05 mumoles Pi/mg protein-hour. Distribution of the succinic dehydrogenase is similar to this Na+, K+-ATPase. The data show that Na+, K+-ATPase activity in the ROS fraction is due to the contamination by the inner segment membranes, and that this enzyme is absent in the photoreceptive membranes of ROS.

Adenosine Triphosphatases↗
PubMedDate not supplied

[Rhabdomere adenosine triphosphatase systems of the squid Todarodes sloanei pacificus].

Highly purified fraction of squid photoreceptor membranes exhibits relatively low activity of Na+,K+-ATPase. No correlation was observed between the distribution of rhodopsin and Na+,K+-ATPase activity among photoreceptor membrane subfractions obtained from rhabdomeres. On the basis of these data, it is suggested that Na+,K+-ATPase and rhodopsin are localized in different membrane structures. In most purified fractions of rhabdomeres, the ratio of rhodopsin to total protein amounted up to 45--50%. In Triton X-100 extracts from membrane fractions, significant enrichment in rhodopsin content was observed.

Adenosine Triphosphatases↗
PubMedDate not supplied

[A method for determining the classification of a protein in a given family at a low level of similarity].

Basing on the analysis of the primary structure of proteins from a family of signal receptor proteins, the existence of short extremely conservative family-specific chains was postulated. These chains may serve as a marker in determination of the relationship of a protein to the given family. On the basis of the performed analysis, it is suggested that mass-oncogene belongs to the family of signal receptors, whereas pheromonal receptor of the yeasts STE-2--presumably does not.

Amino Acid Sequence↗