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Biomedical subjects

S Callahan

Publications and source records attributed to S Callahan.

At least 55 records · Page 3Linked to original sources
PubMed1985

Relation between testosterone concentration, sex role identity, and personality among females.

Eighty-four undergraduate female students completed Baucom's Masculinity and Femininity Scales, the Bem Sex Role Inventory, and the Adjective Check List. Testosterone concentration was determined from saliva samples provided by the women. The results indicated that sex role type was related to level of testosterone concentration. More specifically, undifferentiated females had much higher levels of testosterone concentration than did the feminine-sex-typed females. Also, females with high levels of masculinity (androgynous and masculine-sex-typed females combined) had somewhat higher testosterone levels than did feminine-sex-typed females. Adjectival correlates indicated that females with higher testosterone concentrations perceive themselves as self-directed, action-oriented, resourceful individuals; women with lower testosterone concentration view themselves as conventional, socialized individuals, possessing a caring attitude coupled with an anxious and dejected mood.

Adult↗
PubMed1981

Physical and chemical characterization of the major lactose-blockable lectin activity from fetal calf skeletal muscle.

The lactose-blockable lectin activity from fetal calf skeletal muscle has been purified to apparent homogeneity. The purification entails differential centrifugation, ammonium sulfate precipitation, asialofetuin affinity chromatography with a lactose gradient and ion-exchange chromatography on DEAE-cellulose. In the last step, the activity is resolved into a major and minor species, designated ion-exchange-purified lectins I and II, respectively. Both lectin activities are reversibly inhibited by lactose and appear as single bands with identical mobilities on SDS-polyacrylamide gel electrophoresis. Lectin II was not obtained in sufficient quantities for further characterization. Lectin I is characterized by a functional requirement for reducing agents and sensitivity to N-ethylmaleimide, which suggests a role for an essential thiol in its activity. Subunit molecular weight determinations by SDS-polyacrylamide gel electrophoresis (12 000 +/- 1 000) and by gel filtration in 6 M guanidine . HCl (13 000 +/- 1 000), when compared with that obtained under native conditions on Bio-Rad P-60 gels (27 000 +/- 2 000), suggest a true Mr of 25 000 +/- 3 000 for the dimeric molecule. Amino acid composition data, when fitted to this molecular weight, lead to the tentative conclusion that the intact dimer is composed of two very similar but compositionally non-identical chains, designated by alpha and beta. While the only detectable N-terminal amino acid is tryptophan, the isoelectric focusing pattern of lectin I supports this heterodimeric structure. In addition, a lactose-sensitive hemagglutinating activity which can be separated from the lactose-blockade activity by affinity chromatography was also observed.

Amino Acids↗
PubMedDate not supplied

Is gender germane?

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Ethics, Professional↗
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Reason for interest.

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Bioethical Issues↗
PubMedDate not supplied

The moral case against euthanasia. Catholics must articulate persuasive arguments to counter the cultural rush toward assisted suicide.

Catholics who adhere to a consistent ethic of life are going to face tougher opposition as they struggle to defend society's most vulnerable members. The major ethical contention will concern the ethics of dying. Unfortunately, there have not been well-articulated moral arguments to counter society's rush toward physician-assisted suicide and euthanasia. Catholics must articulate a persuasive ethical ideal for dying a truly good death. It is crucial to achieve a balance: between valuing individual autonomy and protecting the common good; between affirming the goodness of life and accepting death as a reality of the life cycle. Another challenging piece of the moral argument lies in convincing people that the means and processes used to achieve a goal are rarely neutral. Another serious problem with permitting the killing of self or others is that one cannot ever be certain of the agent's motivation. And when an individual's subjective determination of a need to choose death is given ultimate validity, there is no way to call a halt. If medical mercy killing becomes acceptable, social pressure can mount for an ill person to ask for death to relieve the family burdens. Maintaining an absolute prohibition against actively taking a human life--self or other, with or without consent, dying or not--is necessary to protect human communal bonds.

Catholicism↗
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A feminist case against euthanasia. Women should be especially wary of arguments for "the freedom to die".

Feminists, among others, should not be too quick to hail assisted suicide and euthanasia as extensions of human freedom. Indeed, there are good reasons why women should be especially suspicious of such "reforms." First, it is not clear that a person has a moral right to end his or her existence. Feminists understand that suicide and murder are irretrievably linked, and that a person is not a monad. We often hear of suicide attempts in which the person's body--by vomiting up poison, for instance--overrules his or her mind. If there can be such miscommunication between a mind and a body, how are we to trust the communication between a person and the physician ready to assist his or her suicide? Ambivalent motivation and ambiguous meanings have always characterized human relations. In the past, however, an absolute taboo against suicide or euthanasia cemented a patient's right to expect the care of his or her physician, family, and community. If we were to discard that taboo, we would subtly alter these relationships and make each other more vulnerable. History suggests that women, minorities, the ill, the old, and the handicapped would be most at risk. Finally, the assisted-suicide debate has even larger social implications. Unconditional respect for the gift of life is eroding in the United States. The suicide rate is already climbing at all levels of society, especially among teenagers. Wouldn't the acceptance of suicide and euthanasia make it even more acceptable for people to check out of all kinds of uncomfortable situations--marriages or life?

Aged↗
PubMedDate not supplied

[Epidemiological study of cannabis abuse and dependence in 256 adolescents].

A study of cannabis use in French adolescents was implemented using a questionnaire derived from the French version of the Mini International Psychiatric Interview based on DSM IV criteria for cannabis dependence, among a population of 256 high school students from two high schools with different SES backgrounds. Among the adolescents studied, 41.4% (n = 106) reported using cannabis occasionally or regularly, 51.2% had never used cannabis, and 7.4% had used cannabis and subsequently quit. Incidence of usage appeared to increase as a function of age, 51.4% for those 18 years and over, 44.6% for 17 years-old, and 30.4% for 16 years-old, girls tending to consume less than boys (36.4% to 45.2%). With regards to results of the MINI, of the regular or occasional users (n = 106), 47.2% of the subjects indicated substance dependence while the remaining subjects indicated that they were recreational users only. Among users, data concerning tolerance, withdrawal, and excessive consumption indicated that subjects were significantly affected by their addictive behavior; 33% of users reported having smoked cannabis for one year or less with 10.4% reporting that they have smoked for more than three years. Among those having smoked one year or less, 31.4% reported signs of dependence versus 68.6% who consume on a recreational basis; among those having used cannabis for three years or more, 63.6% reported dependence while 36.4% admitted to recreational usage. This study indicates the seriousness of cannabis usage among high-school students, underlining addictive and dependent behavior and their effects on daily life as well as significant the increase of usage with age and as a function of number of years of smoking.

Adolescent↗
PubMedDate not supplied

[Symptoms of DSM IV borderline personality disorder in a nonclinical population of adolescents: study of a series of 35 patients].

1,363 high school students were solicited to complete a personality disorder questionnaire and were encouraged to continue in the study by signing up for interviews with Master's level psychology students. 107 students (7.8%, 34 males, 73 females, mean age = 16.7 +/- 1.8) manifested themselves for the interview and were assessed by using structured diagnostic interviews for borderline personality disorder and major depressive disorder (DIB-R, Revised Diagnostic Interview for Borderlines; MINI, Mini International Neuropsychiatric Interview). The interviews were audiotaped. Interrater reliability was determined by independent ratings of 12 borderline subjects and 12 non-borderline subjects (kappa: 0.795). The distribution of the 107 subjects based on the number of DSM IV borderline personality disorder criteria indicated a gradual dispersion suggesting a continuum from normality to borderline personality disorder: 8% of the subjects met none of the criteria; 16% met one criterion; 17% met two; 12.5%, three; 13.7%, four; 8.4%, five; 5.6%, six; 9.3%, seven; 4.6%, eight; 4.6%, nine. Thirty-five of these 107 subjects (32.7%, 6 males, 29 females, mean age = 16.7 +/- 1.7) received a diagnosis of borderline personality disorder according to DSM IV criteria. The most frequent symptoms were paranoid ideation or dissociative symptoms (97.1%), affective instability (88.6%), inappropriate, intense anger (85.6%), suicidal gestures or automutilation (82.9%), followed by frantic efforts to avoid abandonment (77%), impulsivity (65.7%), unstable and intense relationships (62.9%), identity disturbance (60%), and emptiness (57.1%). The comparison between borderline and non-borderline subjects showed that all borderline personality disorder criteria discriminated significantly between the two groups. The high incidence of paranoid ideation (97.1%) and dissociative experiences (65.7%) in the borderline group suggests the pertinence of criterion 9 in the diagnosis of borderline personality disorder in adolescents. Two criteria of schizotypal personality disorder were also frequent in this group: 68.6% of the borderline group reported odd beliefs or magical thinking, in particular beliefs in clairvoyance or telepathy and 88.6% reported unusual perceptual experiences, in particular sensing the presence of a force or person and bodily illusions. Moreover, 31.4% of the borderline group reported transient "quasi" psychotic experiences, mainly "quasi" visual hallucinations. Auditory hallucinations or delusional ideas were not observed. This symptomatology suggests a "quasi" psychotic dimension of adolescent borderline personality disorder. Affective instability was the next most frequent symptom which was usually marked by a cyclothymic appearance. Comorbidity with major depressive disorder was high: 85.7% of the borderline subjects had a concurrent diagnosis of major depression versus 45.8% of the non-borderline subjects. Thus, major depression is more frequent than most of the borderline personality disorder criteria, with the exception of the already noted paranoid ideation and affective instability. Hypomanic symptoms were frequent in the borderline group (65.7%) as well as in the non-borderline group (38.8%). This symptomatology suggests that adolescent borderline personality disorder is linked to an attenuated bipolar spectrum characterised by major depressive episodes and soft signs of bipolarity. However, hypomanic symptoms, which were quite frequent in non-borderline subjects, might also be due to a mechanism of defence, i.e. the denial of depression. Comorbidity with anxiety disorders appeared also to be high: anxiety symptoms were found in 91.4% of the borderline subjects who reported symptoms of generalised anxiety disorder, panic disorder, and somatoform disorders. The overall clinical appearance of these borderline adolescents not referred for treatment seemed to be quite similar to that of borderline adolescents in clinical samples. This study shows that adolescent borderline personality disorder in non-clinical population is a serious disorder characterised by the importance of mental suffering and behavioural disturbances the disorganising power of which may fix the developmental process in a pathological pathway. Adolescent borderline personality disorder appears in this study to be strongly associated with major depressive disorder and at-risk behaviours linked to impulsivity, affective instability, and suicidal ideation. However, this study found an absence of precise cut-off between borderline and non-borderline subjects. Two factors might have contributed to the appearance of a continuum. First, some degree of impulsivity and instability in affectivity, self-images and interpersonal relationships is part of normal adolescence. (ABSTRACT TRUNCATED)

Adolescent↗
PubMedDate not supplied

[Personality disorders in a nonclinical sample of adolescents].

OBJECTIVE: To examine the comorbidity of borderline personality disorder and other personality disorders in a nonclinical sample of high-school students. METHOD: 311 high-school students who completed the French version of the CES-D (Center for Epidemiological Studies-Depression Scale), were asked to participate to interviews evaluating personality functioning: 60 subjects (19%) accepted to participate in the study. The mean CES-D score of these 60 subjects (16 boys, 44 girls, mean age=17.7 1.7) was significantly higher than the mean score of the whole sample (23.9 10.4 versus 16.7 9.8). Thus the interviewed sample was not representative of the population of high-school students. Subjects were assessed using the major depressive episode module of the MINI (Mini International Neuropsychiatric Interview) and the SIDP IV (Structured Interview for DSM IV Personality). Inter-rater reliability was determined by comparing the independent ratings of interviewers and an experienced clinician on a random sample of 20 interviews. For DSM IV borderline personality disorder diagnosis, the Cohen's kappa coefficient was 0.85. For personality disorder criteria, kappa ranged from 0.6 to 1.0 (average kappa=0.79). RESULTS: Sixteen of these subjects (26,7%, 4 males, 12 females) received a diagnosis of borderline personality disorder according to DSM IV criteria. The mean CES-D score of borderline subjects (30.6 10.2) was significantly higher than the mean score of nonborderline subjects (21.6 10.5). Of the 16 borderline subjects, 11 (75%) received a diagnosis of major depressive disorder versus 14 (31%) of the non borderline subjects. None of the other personality disorders approached the frequency of borderline personality disorder. The next most frequent diagnoses were depressive and dependent personality disorders which occurred in respectively in 16.6% and 10% of the 60 subjects. All the personality-disorders occurred at higher rates in the group with borderline personality disorder with the exception of obsessive-compulsive personality disorder which was diagnosed only in nonborderline subjects. Of the 16 borderline subjects, 11 (68.7%) met the criteria for another personality disorder which were depressive personality disorder (N=5), paranoid personality disorder (N=4), dependent personality disorder (N=3), antisocial personality disorder (N=2), histrionic personality disorder (N=2), avoidant personality disorder (N=2), negativistic personality disorder (N=2), schizotypal personality disorder (N=1), narcissistic personality disorder (N=1), self-defeating personality disorder (N=1). The optional diagnoses (self-defeating, depressive and negati-vistic personality disorders) accounted for 8 of 23 (34.7%) cases of personality disorders diagnosed among borderline subjects. Among these 11 adolescents, 5 received 2 diagnoses of personality disorders (borderline and paranoid personality disorders, N=1; borderline and dependent personality disorders, N=1; borderline and depressive personality disorders, N=3), 3 received 3 diagnoses (borderline, antisocial and histrionic personality disorders, N=1; borderline, avoidant and negativistic personality disorders, N=1; borderline, depressive and negativistic personality disorders, N=1), 3 received 5 diagnoses (borderline, paranoid, histrionic, narcissistic and dependent personality disorders, N=1; borderline, paranoid, dependent, avoidant and depressive personality disorders, N=1; borderline, paranoid, schizotypal, antisocial and self-defeating personality disorders, N=1). Among the 44 adolescents (12 boys, 32 girls) without borderline personality disorder, 10 (22.7%) (3 boys, 7 girls) met the criteria for another personality disorder which were depressive personality disorder (N=5) or cluster C disorders -obsessive-compulsive personality disorder (N=4), dependent personality disorder (N=2), avoidant personality disorder (N=1) - with the exception of one diagnosis of histrionic personality disorder. Two subjects received 2 diagnoses (obsessive-compulsive and depressive personality disorder). The internal consistency of personality disorders criteria was assessed with Cronbach's alpha coefficient. Borderline personality disorder criteria had high internal consistency (0.82). The factor structure of borderline personality disorder criteria was studied with an exploratory factorial analysis which extracted three factors. The eigenvalues were 3.70, 1.06, and 1.01. Confirmatory factorial analyses were conducted. The correlated two-factor model and the three-factor model fit the data well but the correlation between factors was, however, judged too high, ranging from 0.70 to 0.78. The one-factor model proved to have a good fit (Goodness of Fit Index=0.89, Comparative Fit Index=0.90, Root Mean Square Residual=0.07). As a previous study showed the frequency of two schizotypal personality disorder criteria (odd beliefs/magical thinking experiences and unusual perceptual experiences), an exploratory factorial analysis was performed on the combined set of criteria of borderline and schizotypal personality disorders. It yielded 2 factors: the first factor consisted of all the borderline personality disorder criteria, odd beliefs/magical thinking, and unusual perceptual experiences and could be called the borderline factor; the second factor consisted of the paranoid and the social avoidance criteria and could be called the interpersonal hypersensitivity factor. A confirmatory factor analysis showed that this two-factor model provided a good fit to the data (GFI=0.82, CFI=0,91, RMSR=0.10). The correlation between factors was weak (0.25). These results suggest that odd beliefs/magical thinking and unusual perceptual experiences are a component of borderline symptomatology in adolescents. DISCUSSION: The high frequency of major depressive disorder and personality disorders in the interviewed sample may be due to the possibility that adolescents with psychological problems have used the interview as a way to obtain attention and support from a psychologist. The interviewed sample, which was characterized by a high intensity of depressive symptomatology and by a high frequency of borderline personality disorder, could thus be seen as intermediate between a clinical and a community sample. Our results may be more generalizable to an outpatients population of adolescents. This study found conflicting results about the construct validity of borderline personality disorder in adolescent. The high internal consistency and the one-factor structure of the borderline personality disorder criteria argue for their validity in adolescents. However, the high rates of comorbidity of borderline personality disorder with depression and other personality disorders, extended to clusters A, B and C and to optional diagnoses, suggest the lack of construct validity of either borderline personality or cluster B disorders in adolescents. CONCLUSION: Borderline symptomatology in adolescents appears more in adequacy with a dimensional model than with a typological classification. More studies are needed to assess and improve the construct validity of borderline personality disorder in adolescents.

Adolescent↗