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Biomedical subjects

J M Barry

Publications and source records attributed to J M Barry.

At least 181 records · Page 10Linked to original sources
PubMed1976

Ion binding and chromatin condensation.

1. The binding of 45Ca2+ to hen erythrocyte chromatin has been studied to help elucidate how cations induce a reversible condensation of this chromatin. 2. As the unbound Ca2+ of the medium rises from 0.5 to 4 mM, Ca2+ is bound to the chromatin with a stability constant of approx. 3.1 and a saturation value of 0.25 Ca2+ per DNA phosphate, or one-half the value for pure DNA. Condensation of the chromatin is half complete when this binding of calcium is roughly half complete. Hence the transition from the uncondensed to the condensed state occurs as repulsion between the free DNA phosphates of erythrocyte chromatin is neutralised by bound cations. Genetically active chromatin may be maintained in an uncondensed state in living cells by the presence of different negative groups that remain unneutralised at the unbound cation concentrations of the cell. 3. That only one-half of the calcium binding sites of DNA are masked in erythrocyte chromatin supports recent models of chromatin structure in which the DNA double helix is wound round a core of histones. 4. Competition for calcium binding sites in the chromatin by other cations was also studied.

Animals↗
PubMed1976

Testis tumor metastatic to lung: twenty-two-year survivor.

A case is presented of a twenty-two-year survivor following pulmonary resection of a solitary embryonal cell carcinoma metastasis from a primary teratocarcinoma of the testis. The literature is reviewed with regard to this problem, and the criteria for pulmonary resection of metastic lesions are presented.

Adult↗
PubMed1976

Angiomyolipoma: diagnosis and treatment.

Four cases of renal angiomyolipoma are presented, 3 of which were diagnosed in non-tuberous sclerosis patients. In 1 case diagnosis was made preoperatively and in another case it was made intraoperatively, allowing for preservation of functioning renal parenchyma. The second successful kidney transplant in a patient with tuberous sclerosis and renal failure is reported. One cannot always differentiate renal angiomyolipomas from adenocarcinoma. However, if the classical angiographic findings of sacculated pseduo-aneurysms supplied by the interlobular and interlobar arteries are present non-operative observation or limited surgery with preservation of renal tissue is possible. Also, knowledge of the gross pathologic appearance and the syndrome of tuberous sclerosis will allow one to make a preoperative or intraoperative diagnosis with confidence.

Adult↗
PubMed1976

Priapism: treatment with corpus cavernosum to dorsal vein of penis shunts.

Deep and superficial dorsal vein to corpus cavernosum shunts successfully relieved priapism lasting 6 and 3 1/2 days in 2 patients. Since the procedures are anatomically sound, require a small surgical field, do not require saphenous vein mobilization and cannot result in a urethrocutaneous fistula further, clinical trials are warranted. If this brief procedure is unsuccessful in relieving priapism corpus cavernosum to saphenous vein or corpus cavernosum to corpus spongiosum shunts can be accomplished without again preparing or positioning the patient.

Adolescent↗
PubMed1976

Ureteroileourethrostomy: 16-year followup.

Ureteroileourethrostomy has been abandoned at our institution for replacement of the bladder because: 1) it compromised the cancer operation and 2) upper urinary deterioration forced conversion to ureteroileocutaneous diversion in 2 of 3 patients. The ureteroileourethrostomy may have future application if all of the prostate is removed when cystectomy is necessary for bladder cancer. The urinary retention can be satisfactorily managed with clean, intermittent self-catheterization. The hyperchloremic metabolic acidosis can be satisfactorily managed by reducing residual urine and potassium citrate administration. The upper urinary tract changes can be partially or wholely prevented with antirefluxing ureteroileal anastomoses.

Adult↗
PubMed1975

RNA synthesis in nuclei isolated from early embryos of Xenopus laevis.

1. Rates of RNA synthesis in isolated Xenopus embryo nuclei decrease from blastula through gastrula and neurula stages to hatching tadpoles. 2. In blastula and gastrula nuclei, net synthesis of RNA continues for over 30 min, both in the presence of KCl at 0.4 M and in its absence. In nuclei from later stages, net synthesis continues for only about 10 min in the absence of KCl. 3. At low ionic strength, RNA synthesis in all nuclei is greater with optimum Mg-2+ (6 mM) than with optimum Mn-2+ (1 mM). At high ionic strength the reverse is true. 4. An unusual feature, which gradually disappears as development proceeds, is that curves relating RNA synthesis to KCl concentration show a peak at 0.1 M KCl. In blastula nuclei, RNA synthesis is more rapid at 0.1 M KCl than at 0.4 M. 5. This peak at low ionic strength is not observed in the presence of the initiation inhibitor rifamycin AF/013. It is concluded that the peak arises from initiation of RNA synthesis by an excess of RNA polymerases bound non-specifically to the isolated nuclei. The residual synthesis, representing elongation of chains that were initiated in vivo, still declines as development progresses. 6. In blastula nuclei, over half of the RNA synthesis is effected by polymerase II (inhibited by alpha-amanitin), the proportion remaining roughly constant with increasing ionic strength. In neurula nuclei, the proportion rises from about one-half to three-quarters. The initiation-dependent peak in blastula and gastrula nuclei is contributed by both alpha-amanitin-sensitive and alpha-amanitin-resistant enzymes.

Amanitins↗
PubMed1975

Non-urologic flank pain: a diagnostic approach.

Pain typical of that from the diseased reno-ureteral unit can emanate from any adjacent organ or any organ with the same innervation. It may also be the result of, or be exacerbated by, mental illness. Case examples of herniated thoracic disk, T12 neuralgia and short leg syndrome, costovertebral joint arthritis, metastatic carcinoma, myofascial syndrome and pancreatitis demonstrated the need for an orderly approach to the problem. Currently, patient screening with the Cornell medical index and the urology questionnaire allows direction of the physical examination, special radiographic and laboratory studies and psychiatric evaluations. An orderly evaluation of flank pain will prove rewarding and may prevent unnecessary urologic operations.

Adult↗
PubMed1975

The supracostal approach to the kidney and adrenal.

Our experience with 67 supracostal approaches to the kidney or adrenal gland demonstrates that 1) the exposure was uniformly superb,2) diaphragm reapproximation was unnecessary, 3) a single pericostal suture soundly closed the intercostal space, 4) no complications could be attributed to inadequate exposure and 5) pleural entry was the most common complication. We have found the supracostal approach to the kidney and adrenal to be staisfactory and recommend it to others.

Adrenalectomy↗
PubMed1975

Suprapubic and retropubic prostatectomy for prostatic hyperlasia.

The historical aspects, preoperative evaluation including preoperative note and postoperative flow sheet examples, and the surgical techniques of suprapubic and retropbuic prostatectomies are described in detail. These procedures allow relief from symptomatic prostatic hyperplasia with minimal morbidity and mortality.

Anesthesia, General↗