Saliva and Serum Protein Adsorption on Chemically Modified Silica Surfaces

Biomaterials, once inserted in the oral cavity, become immediately covered by a layer of adsorbed proteins that consists mostly of salivary proteins but also of plasma proteins if the biomaterial is placed close to the gingival margin or if it becomes implanted into tissue and bone. It is often this protein layer, rather than the pristine biomaterial surface, that is subsequently encountered by colonizing bacteria or attaching tissue cells. Thus, to study this important initial protein adsorption from human saliva and serum and how it might be influenced through chemical modification of the biomaterial surface, we have measured the amount of protein adsorbed and analyzed the composition of the adsorbed protein layer using gel electrophoresis and western blotting. Here, we have developed an in vitro model system based on silica surfaces, chemically modified with 7 silane-based self-assembled monolayers that span a broad range of physicochemical properties, from hydrophilic to hydrophobic surfaces (water contact angles from 15° to 115°), low to high surface free energy (12 to 57 mN/m), and negative to positive surface charge (zeta potentials from –120 to +40 mV at physiologic pH). We found that the chemical surface functionalities exerted a substantial effect on the total amounts of proteins adsorbed; however, no linear correlation of the adsorbed amounts with the physicochemical surface parameters was observed. Only the adsorption behavior of a few singular protein components, from which physicochemical data are available, seems to follow physicochemical expectations. Examples are albumin in serum and lysozyme in saliva; in both, adsorption was favored on countercharged surfaces. We conclude from these findings that in complex biofluids such as saliva and serum, adsorption behavior is dominated by the overall protein-binding capacity of the surface rather than by specific physicochemical interactions of single protein entities with the surface.

Gender-responsive programs in U.S. prisons: implications for change

This research examines the need for programs that focus on mental health issues, parenting issues, and other unique needs of female offenders incarcerated throughout the United States. The Bureau of Justice Statistics showed that 84% of female offenders were living with their children prior to their arrest. This constitutes a crisis in our society today, which is manifest in overcrowded state and federal prisons, increased caseloads for the Department of Children and Family Services, the Foster Care System, and families of the offenders. The goal of this research is to determine what types of gender-responsive programs are effective in reducing recidivism. The methods used were qualitative data analysis, by comparing which programs are offered, either within the prison, or as a reentry postrelease program. A survey was used and interview data were analyzed by identifying and comparing common themes and patterns. The findings reveal the most effective gender-responsive programs are those that incorporate substance abuse treatment, education and job preparedness, parenting programs where contact with children is allowed and/or encouraged, and family reunification programs.

Timeout duration and the suppression of deviant behavior in children

The effects of three different timeout durations were investigated in a group of 20 retarded, institutionalized subjects. Each subject received 1, 15, and 30 min of timeout in a design that was counterbalanced in terms of the order in which timeout durations were presented. Displays of deviant behavior-such as aggression, tantrums, and self-destruction-were followed by periods of isolation in a timeout room. A reversal design was employed such that return-to-baseline periods were instituted after each timeout period. The overall effect of timeout was to reduce significantly the rate of deviant behavior. On the average, 15 and 30 min produced a 35% decrease in deviant behavior with little difference between the effectiveness of 15 and 30 min. The range of effects in all timeout conditions varied widely. The sequence in which the 1-min duration was presented effected the direction of its effect. When it preceded the use of longer durations, 1 min was most effective. As it came later in the sequence, its suppressive characteristics became less reliable.

Trauma treatment training for Bosnian and Croatian mental health workers

Trauma treatment training programs were conducted in the former Yugoslavia for Bosnian and Croatian mental health workers. A method was developed for measuring and evaluating compassion fatigue and burnout among the trainees, and an efficient system of international supervision and consultation was implemented. Plans for development of this system to support future training and consultation programs are discussed.

Geriatric medicine in Grahamstown

A developing interest in improved care of the aged by the authorities of Settlers' Hospital in Grahamstown led to an invitation to the Geriatric Unit of the University of Cape Town in March 1984 to visit the hospital. The impressions gained on this visit indicated a need to expand hospital-based geriatric medicine into total community care of the elderly. Data were gathered concerning 50 acutely ill and 31 long-stay elderly black patients in Settlers' Hospital. These findings and the recommendations of various committees are discussed against the background of a model for the delivery of better geriatric care throughout the country. The most urgent necessity for Grahamstown appeared to be provision of better care for aged black people in the community.

Effect of therapist expectations and need for approval on self-disclosure

Previous therapy analogue studies of self-disclosure have treated Ss as a homogeneous group without examining possibly relevant S variables. In the present study, 68 female students identified as high or low in need for approval listened to a tape-recorded interview between a high self-disclosing therapist and a female client under one of two therapist expectation conditions: Clear expectation of high self-disclosure vs. ambiguous expectation. Ss then indicated on the Jourard Self-Disclosure Questionnaire the degrees to which they would be willing to disclose to the therapist. It was predicted that high need for approval Ss would disclose most under the clear expectation condition, while low need for approval Ss would not be affected by the therapist expectation. A significant Need Approval X Therapist expectation interaction supported this prediction. Further analysis indicated that items for the Work, Money, and Personality subsections of the disclosure questionnaire contributed most to the interaction. Implications for differential treatment of high need for approval Ss who were entering therapy were discussed.

Assessment of assertiveness in drug abusers

Administered measures of assertion, social assertion, aggression, and social anxiety to a heroin-addicted population, psychotic outpatients, court-referred drug users and a college student group (N = 114). The addicts and court-referred drug patients were less assertive, less socially assertive, and more socially anxious than non-addict populations. Furthermore, the heroin and psychiatric outpatient groups had a very high correlation between their assertion and aggression scores, which was not found in the college student or court-referred, drug-using group.