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Biomedical subjects

V Reynolds

Publications and source records attributed to V Reynolds.

At least 19 recordsLinked to original sources
PubMed2005

To what extent does living in a group mean living with kin?

Chimpanzees live in large groups featuring remarkable levels of gregariousness and cooperation among the males. Because males stay in their natal communities their entire lives and are hence expected to be living with male relatives, cooperation is therefore assumed to occur within one large 'family' group. However, we found that the average relatedness among males within several chimpanzee groups as determined by microsatellite analysis is in fact rather low, and only rarely significantly higher than average relatedness of females in the groups or of males compared across groups. To explain these findings, mathematical predictions for average relatedness according to group size, reproductive skew and sex bias in dispersal were derived. The results show that high average relatedness among the philopatric sex is only expected in very small groups, which is confirmed by a comparison with published data. Our study therefore suggests that interactions among larger number of individuals may not be primarily driven by kin relationships.

Animals↗
PubMed2001

Sources of variation in the nesting behavior of chimpanzees (Pan troglodytes schweinfurthii) in the Budongo forest, Uganda.

Data on nesting behavior and nests of the Sonso community of chimpanzees (Pan troglodytes schweinfurthii) living in the Budongo Forest, Uganda, were collected between October 1995 and December 1996. Analysis of the selection of nests shows a preference for particular tree species, especially Cynometra alexandri. Male chimpanzees nested lower than females. Day nests were found to be structurally simpler than night nests and were built in tree species used for feeding, at the same height as feeding activity. Day and night nests serve different functions, and should be clearly distinguished in studies of nesting behavior.

Animals↗
PubMed1999

Cultures in chimpanzees.

As an increasing number of field studies of chimpanzees (Pan troglodytes) have achieved long-term status across Africa, differences in the behavioural repertoires described have become apparent that suggest there is significant cultural variation. Here we present a systematic synthesis of this information from the seven most long-term studies, which together have accumulated 151 years of chimpanzee observation. This comprehensive analysis reveals patterns of variation that are far more extensive than have previously been documented for any animal species except humans. We find that 39 different behaviour patterns, including tool usage, grooming and courtship behaviours, are customary or habitual in some communities but are absent in others where ecological explanations have been discounted. Among mammalian and avian species, cultural variation has previously been identified only for single behaviour patterns, such as the local dialects of song-birds. The extensive, multiple variations now documented for chimpanzees are thus without parallel. Moreover, the combined repertoire of these behaviour patterns in each chimpanzee community is itself highly distinctive, a phenomenon characteristic of human cultures but previously unrecognised in non-human species.

Animals↗
PubMed1999

Functional impairment and utilization of services associated with posttraumatic stress in the community.

This study describes social functioning and service utilization patterns associated with posttraumatic stress symptoms relative to nonpsychiatric controls and depressive disorder controls in a cross-sectional epidemiological survey. Data from 49 cases and 147 controls who participated in the North Carolina component of the Epidemiologic Catchment Area study were examined. Results indicate that symptoms of posttraumatic stress were associated with impairment along several domains of functioning: social, financial, physical, and psychological. Individuals with posttraumatic stress were found to have more socioeconomic disadvantages and impaired functioning. Despite this, individuals with posttraumatic stress are receiving relatively few mental health services. Further research assessing service use, treatment, and functional outcomes are indicated.

Adolescent↗
PubMed1998

Axis I comorbidity of borderline personality disorder.

OBJECTIVE: The purpose of this study was to assess the lifetime rates of occurrence of a full range of DSM-III-R axis I disorders in a group of patients with criteria-defined borderline personality disorder and comparison subjects with other personality disorders. METHOD: The axis I comorbidity of 504 inpatients with personality disorders was assessed by interviewers who were blind to clinical diagnosis and who used a semistructured research interview of demonstrated reliability. RESULTS: Four new findings emerged from this study. First, anxiety disorders were found to be almost as common among borderline patients (N=379) as mood disorders but far more discriminating from axis II comparison subjects (N=125). Second, posttraumatic stress disorder (PTSD) was found to be a common but not universal comorbid disorder among borderline patients, a finding inconsistent with the view that borderline personality disorder is actually a form of chronic PTSD. Third, male and female borderline patients were found to differ in the type of disorder of impulse in which they "specialized." More specifically, substance use disorders were significantly more common among male borderline patients, while eating disorders were significantly more common among female borderline patients. Fourth, a lifetime pattern of complex comorbidity (i.e., met DSM-III-R criteria for both a disorder of affect and a disorder of impulse at some point before the patients' index admission) was found to have strong positive predictive power for the borderline diagnosis as well as a high degree of sensitivity and specificity. CONCLUSIONS: These results suggest that the lifetime pattern of axis I comorbidity characteristic of borderline patients and distinguishing for the disorder is a particularly good marker for borderline personality disorder.

Adolescent↗
PubMed1995

Heart rate variation, age, and behavior in subjects with senile dementia of Alzheimer type.

Minute-by-minute heart rate (HR) recordings over a period of 24 h were obtained once for 30 elderly subjects diagnosed as having senile dementia of Alzheimer type (SDAT). Twenty-one of the subjects were studied in a hospital ward setting, and nine were studied in their own homes. Twelve were men and 18 were women. Eleven took some form of sedative medication; 10 took no medication. Thirty-minute mean values were unmasked to take account of the effects of activity and sleep on HR. Results indicate that the masked HR circadian rhythm of SDAT may be more often unimodal than that of normal subjects of similar age, and that phase shift of the endogenous, clock-mediated component of the rhythm (with higher HR at night) is to be expected in a proportion of individuals with SDAT.

Age Factors↗
PubMed1992

Cloning and sequence comparisons of four distinct cysteine proteases expressed by Haemonchus contortus adult worms.

Three new members of a developmentally regulated cysteine protease gene family of the parasitic nematode Haemonchus contortus have been isolated and characterized. One of the new genes, AC-3, was found to be linked in tandem to the previously characterized AC-2 gene. Nucleotide sequence analyses revealed that the first 90 amino acids of AC-3 are organized into four exons, similar to the situation in AC-2. A cDNA that appears to be a near full-length copy of the AC-3 gene was isolated using the polymerase chain reaction (PCR) technique to amplify cDNAs from adult worm poly(A)+ mRNAs. In addition to AC-3, a distinct cysteine protease cDNA, AC-4, was amplified by the same oligonucleotide primers. cDNAs encoding a fifth cysteine protease, AC-5, were isolated from an adult worm cDNA expression library using specific rabbit antisera and by PCR. Comparison of the predicted amino acid sequences of AC-3, AC-4 and AC-5 reveal that they share 64-77% identity with one another and with the previously reported AC-1 and AC-2 sequences. The amino acids surrounding the active site cysteine are highly conserved, as are the positions of other cysteine residues in the mature protein sequences. The H. contortus proteases are more similar to one another than they are to human cathepsin B (38-44% amino acid identity) or to the Sm31 cysteine protease of Schistosoma mansoni (36-40% identity). Our studies indicate that H. contortus adult worms express mRNAs for several distinct cysteine proteases. The significant primary sequence differences between the proteases suggest that they differ in their substrate specificities and precise physiological functions.

Amino Acid Sequence↗
PubMed1987

Splenectomy for end-stage chronic lymphocytic leukemia.

Between February 1980 and December 1985, splenectomies were performed in 13 patients with advanced (Stage III and IV) chronic lymphocytic leukemia (CLL). Patients had advanced disease for a median of 32 months at the time of splenectomy and all were refractory to chemotherapy. All patients were anemic with a median hematocrit of 27.5%; nine patients were thrombocytopenic with a median platelet count of 46,000/microliter. There was no surgical mortality and minimal morbidity. Median hematocrit was 35% at 1 month and 6 months postsplenectomy. Median platelet count in previously thrombocytopenic patients was 261,000/microliter at 1 month and 177,000/microliter at 6 months postsplenectomy. Median survival postsplenectomy in this advanced patient group was 24 months with four patients surviving more than 30 months. Splenectomy is a valuable adjunct to the management of end-stage CLL.

Actuarial Analysis↗
PubMed1982

Clinical experience with malignant pheochromocytomas.

In a 30 year period at Vanderbilt University Hospital, the affiliated Nashville General Hospital and the Nashville Veterans Administration Hospital, 64 patients with pheochromocytoma have been observed. In eight of these, the tumor proved to be malignant. Retrospective review of biologic characteristics of pheochromocytomas in this series included clinical, diagnostic imaging, chemical and histopathologic data. Aside from presence of distant metastases, none of these features had predictive value in indicating the biologic malignant nature of the primary tumor. One patient has been cured by radical surgical resection for 16 years. Three others have died with metastatic tumor and three patients are alive with metastatic tumor.

Adolescent↗
PubMed1978

Anatomical substages of stage III Hodgkin's disease: implications for staging, therapy, and experimental design.

Twenty-three patients with pathologic stage III Hodgkin's disease were classified with respect to the presence or absence of symptoms (III-A, III-B), the presence or absence of splenic involvement (IIIS+, IIIS-) and anatomic substage--the extent of disease within the abdomen (III1, III2). Stage III1 disease included disease limited to the upper abdomen, i.e., spleen, splenic node, celiac node, and/or portal node. All other more extensive disease was classified as stage III2. Symptoms and splenic involvement did not predict either disease-free survival or survival. However, 5 year actuarial disease-free survival was significantly better in III1 patients as compared to III2 patients (77% vs. 13%, p less than .001). Eight of nine stage III2 patients receiving total nodal radiotherapy alone relapsed. When considered along the previous studies of anatomic substage, these findings suggest that patients in stage III1 and III2 should receive different therapeutic approaches. Analysis of therapeutic results in stage III patients must consider anatomic substage.

Abdomen↗
PubMed1975

Phase I studies of porfiromycin (NSC--56410) in solid tumors.

Porfiromycin was given to a group of patients with a variety of solid tumors. Of 114 patients admitted to the study, 103 yielded evaluable data. The following dosage schedules were used to determine the toxicity of porfiromycin when given in multiple doses by intravenous injection: 0.2 mg/kg x 5 days, 0.3 mg/kg x 5 days, 0.35 mg/kg x 5 days, 0.4 mg/kg x 5 days, 0.24 mg/kg x 10 days and 0.6 mg/kg weekly. Toxic effects noted were mainly leukopenia, thrombocytopenia, and, when injected paravenously, local tissue necrosis. Biological effects were noted at all dosage levels and were more severe at the higher dosages. The data suggest that profiromycin administered intravenously at a dose of 0.35 mg/kg daily for 5 days results in moderate hermatological toxicity and clinical evaluation in a Phase II study at this dosage level is indicated.

Drug Evaluation↗