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P Buck

Publications and source records attributed to P Buck.

At least 55 records · Page 3Linked to original sources
PubMed1987

The optimum position of arthrodesis of the ankle. A gait study of the knee and ankle.

UNLABELLED: Findings from biomechanical analyses of gait were used to estimate the optimum position of arthrodesis of the ankle. Nineteen patients who were followed for an average of 10.4 years (range, four to seventeen years) were studied. By including the knee in the analysis as well as studying the effects on gait of different ground conditions, objective data for the weight-bearing extremities in the transverse, sagittal, and coronal planes were generated. Genu recurvatum was shown to be associated with a plantar-flexion position of fusion of the ankle. Laxity of the medial collateral ligament of the knee was noted in twelve patients (63 per cent). Among these patients, in three (16 per cent) the laxity was graded as moderate to severe, possibly due to external rotation of the extremity during gait to avoid rolling over the rigid plantar-flexed ankle. The patterns of gait showed that a valgus position of the arthrodesis is more advantageous and provides more normal gait, particularly on uneven ground. To attain more normal function of the knee and improve performance on rough ground, the optimum position of arthrodesis of the ankle appears to be neutral flexion, slight (zero to 5 degrees) valgus angulation, and approximately 5 to 10 degrees of external rotation. Posterior displacement of the talus under the tibia tends to produce a more normal pattern of gait and decreases the stress at the knee. CLINICAL RELEVANCE: This study has shown the ideal position of fusion of the ankle to be neutral flexion, slight (zero to 5 degrees) valgus angulation of the hind part of the foot, and 5 to 10 degrees of external rotation. This position allows the greatest compensatory motion at the foot and places the least strain on the knee.

Adult↗
PubMed1986

Evidence of mountain cedar pollen in Tulsa.

Over the past five winters atmospheric Juniperus (cedar) pollen was collected in December and January in Tulsa, Oklahoma. Evidence from phenology, wind patterns, and plant distribution indicate that this pollen is from Juniperus ashei (mountain cedar) populations in south central Oklahoma and possibly Texas. The presence of this highly allergenic pollen in the Tulsa atmosphere indicates the potential for allergy problems among sensitive individuals in northeast Oklahoma.

Air Pollutants↗
PubMed1985

An immunoradiometric assay for endopeptidase-24.11 shows it to be a widely distributed enzyme in pig tissues.

An immunoradiometric assay for endopeptidase-24.11, which depended on the absorption by tissues of a monoclonal antibody, GK7C2, was established. The optimum conditions for the assay were defined and its correlation with an enzymic assay determined. The immunoassay was used to survey the endopeptidase in crude homogenates of various tissues of the pig. Detergent treatment decreased the sensitivity of the assay but did not invalidate it. Although the endopeptidase was found in many tissues, it was neither uniformly nor ubiquitously distributed. Kidney cortex was confirmed as the major location of the endopeptidase, containing 5000 ng/mg of protein. Lymph nodes were also very active (1370 ng/mg), followed by chondrocytes from articular cartilage (650 ng/mg). In the gut, the endopeptidase was concentrated mainly in the jejunum (130 ng/mg). Various glands (salivary, adrenal, anterior pituitary and pancreas) also contained the antigen in the range 20-55 ng/mg of protein. Lung contained only 5 ng/mg of protein and, in other tissues examined, little or none was detectable. In particular, other lymphoid tissues (spleen, thymus, tonsillar tissues) were relatively poor sources, and none was detectable in peripheral-blood leucocytes or in peritoneal macrophages.

Animals↗
PubMed1985

Postcryopreservation growth of human CFU-GM: sequential examination of methodologic factors.

Postcryopreservation growth of human CFU-GM might provide insight into the reconstitutive potential of human marrow preparations cryopreserved for subsequent autologous hematopoietic reconstitution. Ultimately, the utility of such measurements will depend on: whether comparison of pre- and postcryopreservation CFU-GM values is a guide to loss of reconstitutive potency during or following cryopreservation, and whether such measurements are consistent and reproducible. In our hands, direct, unmanipulated plating of CFU-GM after freezing and thawing resulted in extremely poor CFU-GM growth. Consequently, we undertook a set of sequential experiments designed to optimize technical conditions for growing human CFU-GM after cryopreservation. Utilizing stepwise examinations of washing, multiple plating factors, dilution rate, and diluent, we were able to increase consistently fractional recovery of postcryopreservation CFU-GM growth per 2 X 10(5) cells plated from 8% to 56%. Our results underscore the importance that technical factors (other than freezing conditions) play in the postcryopreservation growth of human CFU-GM.

Bone Marrow Cells↗
PubMed1985

Airborne pollen and mold spores in a subalpine environment.

A Rocky Mountain subalpine environment was sampled for allergenic pollen and mold spores during three growing seasons (1981-1983) using a Rotorod sampler. Pollen levels were generally low until late in the season while mold spores were present in higher levels throughout the sampling period.

Air Pollution↗
PubMed1984

[Retention in flexion of supracondylar fracture of the humerus in children. Comments apropos of the treatment of 120 displaced fractures].

The authors analyse the results obtained in 120 cases of supracondylar fracture of the humerus in children by reduction under general anaesthesia followed by fixation of the elbow in flexion, the wrist being placed close to the neck. The biomechanical basis of this technique is reviewed. It is essential that the posterior periosteum should be intact. Technical details are given together with indications. Seventy out of 120 fractures were reviewed after 2 years. There were 82 p. 100 of good results in grade II fractures. Six out of 24 grade IV fractures showed secondary displacement.

Biomechanical Phenomena↗
PubMed1984

Non-allergenic native and cultivated plants in Oklahoma: landscaping without hay fever.

Many common landscaping plants produce allergenic pollen. Hay fever patients can reduce their exposure to aeroallergens by selecting non-allergenic species for yards, lawns and streets. The plants listed here are non-allergenic (hypo-allergenic) and possess characteristics desired for landscaping. Categories described include trees, shrubs, vines, perennial herbs and grasses.

Maintenance↗
PubMed1984

[Megalo-urethra. Single-stage neonatal correction. Review of the literature].

A scaphoid megalo-urethra was diagnosed in a premature, free of other associated malformations. Surgical correction by Nesbitt technic was performed at 2 500 g weight. The follow-up was uneventful and the cosmetic appearance of the penis is good. High rate of consanguinity is noted. The reported case is exceptional because 75% of the patients exhibited severe upper urinary tract anomalies. Prune belly and imperforate anus are also frequently associated.

Humans↗
PubMed1983

Cardiac tumors in infancy. Recent aspects.

Intracardiac tumor is rare in the newborn but often responsible for severe cardiorespiratory distress and neonatal death. Diagnosis is made very late and most of them are only recognized after death. We observed 5 cases of intracardiac tumors in newborn, of various etiology and, in the last patients, diagnosis was made very early after birth and even during pregnancy. Echography and especially fetal echocardiography seems to be of great importance in managing this kind of pathology.

Echocardiography↗
PubMed1983

[Abdomino-pericardial hernia as a result of an anomaly of the septum transversum. Apropos of a case in a newborn infant].

This is a case report of a peritoneo-pericardial diaphragmatic hernia revealed by a respiratory distress in a newborn infant. Radiography and angiocardiography allowed preoperative diagnostic and the patient was operated upon successfully on two days of age. Anatomic finding was a defect of the central tendon of the diaphragm with a hernial sac. This anomaly is rare and probably results from a misdevelopment of the septum transversum.

Diaphragm↗
PubMed1982

Weather patterns and ragweed pollen production in Tulsa, Oklahoma.

Levels of atmospheric Ambrosia (ragweed) pollen in the urban environment of Tulsa, Oklahoma, were determined using a Rotorod sampler. The data, representing the distinctly different growing seasons of 1980 and 1981, suggest it may be possible to predict pollen season levels based upon early summer weather patterns.

Oklahoma↗
PubMed1981

Effects of human neutrophil granule extracts on macromolecular synthesis in Neisseria gonorrhoeae.

Neisseria gonorrhoeae were exponentially killed for 120 min (i.e., they were prevented from forming colonies on agar) by extracts of human neutrophil granules; however, macromolecular synthesis, indicated by incorporation of radiolabeled precursors in trichloroacetic acid-precipitable material, continued at or above zero time control values for 45 min. Protein, deoxyribonucleic acid, and ribonucleic acid synthesis appeared to decrease simultaneously after 45 min. Little or no lysis gonococci occurred during the first 60 min of incubation. The ions K+, Na+, Ca2+, Cl1-, SO4(2-) and PO4(3-) at concentrations of less than or equal to 100 mM did not affect granule extract bactericidal activity. On the other hand, 20 mM Mg2+ completely inhibited killing when initially present along with granule extract or when added within 2 to 5 min after granule extract was added to a suspension of gonococci. Gonococci treated with granule extract, washed, and then incubated in gonococci. Gonococci treated with granule extract, washed, and then incubated in the absence of extract died as if extract were still present. The ability of subinhibitory concentrations of actinomycin D or erythromycin to inhibit growth and protein and nucleic acid synthesis was synergistically increased in the presence of granule extract. The above information suggests that a bactericidal component(s) of human neutrophil granules sticks to gonococci, altering their outer membrane permeability and their ability to divide.

Anions↗
PubMed1981

Synovial sarcoma: a review of 33 cases.

Thirty-three patients with synovial sarcoma were studied with respect to age, sex, site, clinical presentation, pathologic findings, and primary surgical treatment. Seventy percent of the patients were in the first three decades of life, and there was a 2:1 male predominance; the overall survival rate was 36%. There was a high local recurrence rate (64%) after simple local excision, and poor survival (27%). While wide local resection gave the best results (50% survival), it also carried a risk of high recurrence. Patients treated by amputation had a 42% survival rate. Thus, it can be concluded that adequate surgical treatment improved survival and reduced the recurrence rates. The lungs were the most common metastatic site, but lymph node metastasis occurred in 27% of the patients, often after tumor recurrence. Favorable prognostic factors included youth (patients younger than 20) and biphasic or epitheloid histologic types.

Adolescent↗