Spin dynamics of isolated donor electrons in phosphorus-doped silicon from high-frequency electron spin resonance.

We present the spin dynamics of isolated donor electrons in phosphorus-doped silicon at low temperature and in a high magnetic field. We performed a steady-state electron spin resonance (ESR) on the sample with a dopant concentration of 6.5 × 10(16) cm(- 3) in a high field of 2.

Experimental observation of the 1/3 magnetization plateau in the diamond-chain compound Cu3(CO3)2(OH)2.

The magnetic susceptibility, high field magnetization, and specific heat measurements of Cu3(CO3)2(OH)2, which is a model substance for the frustrating diamond spin chain model, have been performed using single crystals. Two broad peaks are observed at around 20 and 5 K in both magnetic susceptibility and specific heat results. The magnetization curve has a clear plateau at one third of the saturation magnetization.

Small cells in hepatoblastoma lack "oval" cell phenotype.

Hepatoblastoma, a childhood tumor of the liver, is composed of epithelial and mesenchymal elements in varying proportions and at various stages of differentiation. The epithelial element recapitulates the stages of hepatocyte development from the primitive blastema through embryonal hepatocytes to fetal hepatocytes. The blastemal or undifferentiated cells have been postulated to represent neoplastic hepatocyte progenitor cells.

Percutaneous Transluminal Angioplasty (PTA) with Wallstent for Internal Carotid Artery Stenosis. A Case Report.

A 67 year-old male who had suffered from myocardial infarction, was admitted to our clinic to examine his internal carotid artery stenosis revealed by preoperative study for heart surgery. Although he had no neurological symptoms, the angiograms showed severe stenosis of his right internal carotid artery. To improve stenotic internal carotid artery, PTA was performed employing a selfexpanding stent.

Comparison of sonograms and liver histologic findings in patients with chronic hepatitis C virus infection.

Gray scale ultrasonographic images of the liver were correlated with histologic findings in patients with chronic hepatitis C virus infection. The gray scale patterns of 64 livers with chronic hepatitis C virus infection were categorized as normal, fatty, fibrofatty, fibrotic, or inflammatory and were graded as mild, moderate, or severe. Liver biopsy specimens also were analyzed for the presence of fat, inflammation, and fibrosis and graded similarly.

Simultaneous Pneumocystis carinii and pneumococcal pneumonia in human immunodeficiency virus-infected children.

Three children with acquired immunodeficiency syndrome who had pneumonia develop were infected simultaneously with Pneumocystis carinïi and Streptococcus pneumoniae. Such coexistence has not been previously reported in children. One patient received prophylactic treatment against Pneumocystis carinïi before his illness.

Paecilomyces sinusitis in an immunocompromised adult patient: case report and review.

A case of fungal sinusitis caused by Paecilomyces lilacinus that was unresponsive to amphotericin B and involved a patient with acute myeloid leukemia is described. Histologic examination of sinus tissue and periorbital bone demonstrated invasion by a fungus with septate hyphae, which was identified in culture as P. lilacinus.

Detection of a deep lipoblastoma by MRI and ultrasound.

Lipoblastoma is a rare benign tumor of the soft tissue occurring predominantly during the first two years of life. We report here the application of MRI and ultrasound to the detection of a soft tissue lipoblastoma. By MRI and ultrasound, we precisely evaluated the extent of the tumor, the presence of atypical areas of cystic and mucoid degeneration within the tumor, and its lack of vascularity.

Prostatic specific antigen and immunoglobulin binding factor in human seminal plasma and prostate.

Antibodies raised against prostatic specific antigen (PSA) and immunoglobulin binding factor (IgBF) of human seminal plasma (SP) were used to localize the antigens in various tissues by Western blot. Both antigens were found only in the prostate, including benign prostatic hypertrophy and prostatic adenocarcinoma. The polyclonal anti-PSA antibodies stained five prostatic protein bands with estimated M(r) values of 10, 14, 22, 25, and 33 kD, whereas anti-IgBF antibodies stained a single 16-kD protein.

Immunoglobulin binding factor of seminal plasma: a secretory product of human prostate.

To determine the source of the immunoglobulin binding factor (IBF) in seminal plasma, extracts of testis and accessory male sex organs were prepared and analyzed by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and immunoblot. The detection reagents used were human and mouse serum Ig, monoclonal anti-Leu 11b antibodies, and polyclonal rabbit anti-IBF antibodies. Of the tissues examined, only the prostate, including benign hypertrophy and adenocarcinoma, contained IBF.

Pathology of intestinal ischemia.

Intestinal ischemia produces a spectrum of gross and microscopic pathologic changes that range from transmural necrosis to reversible mucosal injury. Depending on the stage at which tissue is examined, findings may reflect the acute injury or reparative changes. This article reviews the diagnosis of the pathologic findings in differential intestinal ischemia.

Immunoglobulin-Fc binding factor in human male reproductive organs.

Human seminal plasma, testis, seminal vesicle, epididymis, and prostate contain a component with an estimated Mr of 20 kD that binds human immunoglobulin-Fc. The factor did not bind goat-IgG-Fc, immunoglobulins of human, rat, mouse, goat, horse, or rabbit sera and did not interact with antibodies raised against Fc gamma receptors. The present findings show that this Fc binding factor in seminal plasma is a secretory product of the testis and accessory sex organs.

Colonic ischemia complicating immunotherapy with interleukin-2 and interferon-alpha.

Colonic ischemia (CI) is a rare complication of high-dose interleukin-2 (IL-2) immunotherapy. This complication occurred in three of 141 patients (2.1%) with metastatic cancer treated with high-dose IL-2 therapy; CI only developed in patients receiving interferon-alpha (IFN) with IL-2 (three of 21, 14%) compared with none of 120 in those patients receiving IL-2 alone (P equals 0.

Complete remission in refractory anaplastic adult Wilms' tumor treated with cisplatin and etoposide.

A 61-year-old woman underwent a left radical nephrectomy for Stage II anaplastic Wilm's tumor. She received no adjuvant therapy. One year later computerized tomography (CT) of the abdomen revealed a mass in the left renal fossa and retroperitoneal adenopathy.

Natural killer cell activity in a rat model of amiodarone-induced interstitial lung disease.

The role of lymphocytes in the pathogenesis of amiodarone-induced lung disease is controversial. Increases in the percentages of lymphocytes in bronchoalveolar fluid of both patients and animals with amiodarone pulmonary toxicity have been reported. To assess whether these lymphocytes are functionally activated, we measured natural killer cell activity in the lungs and blood of rats with amiodarone-induced pulmonary toxicity.

Posterior septal and right free-wall Kent pathways visualized in situ and removed at operation.

This article describes the first posterior septal and first and second right free-wall pathways identified at operation for Wolff-Parkinson-White syndrome and confirmed histologically. All pathways were found in the areas of preexcitation identified by pre and intraoperative mapping. They bridged the atrium and ventricle, and postoperative electrophysiological testing confirmed division of the pathways.

Central nervous system pathology in pediatric AIDS: an autopsy study.

The neuropathologic findings of brains and spinal cords removed at autopsy from 26 infants and children with AIDS is described; in two cases, only the spinal cords were available. The most common finding in the brains was dystrophic calcification of blood vessels of all calibers in the basal ganglia and deep cerebral white matter (21 og 24 cases). The next most frequent finding was subacute encephalitis (SE) (15 of 24 cases) with microglial nodules and multinulceated giant cells.

Lung lymphocytes in bleomycin-induced pulmonary disease.

Previous studies have not clearly defined the role of cell-mediated immunity in bleomycin-induced lung injury. In this report the functional activity of T lymphocytes obtained from minced lung preparations, bronchoalveolar lavage, and blood of rabbits treated with bleomycin was examined in cell proliferation and cell-mediated cytotoxicity assays. Four days after instillation of bleomycin (10 units/kg) into the right lung, histologic examination revealed mononuclear cell interstitial infiltrates and alveolar exudates.

Nasopharyngeal teratoma in the neonate.

Nasopharyngeal teratomas are rare neoplasms, often presenting as neonatal airway obstruction. A case is presented of a full-term neonate with a mass which filled the oropharynx, nasopharynx and the entire left nasal cavity and extended through the left nares. Airway obstruction necessitated orotracheal intubation immediately after delivery.

Malignant paraganglioma of the thyroid gland.

Paragangliomas of the thyroid gland are rare lesions, only four previous cases having been reported in the literature, to our knowledge. We report herein a fifth case, which, to our knowledge, is the first to exhibit malignant behavior manifested by invasion into perithyroidal soft tissue through the wall of the trachea into the tracheal mucosa.

Cytomegalovirus colitis in acquired immune deficiency syndrome: radiologic spectrum.

Six cases of cytomegalovirus (CMV) colitis are described. The radiographic manifestations of this colitis are nonspecific and usually mimic the findings of ulcerative colitis with diffuse mucosal ulceration or granulomatous colitis with aphthous ulceration and skip areas. Terminal ileal involvement was noted in 1 patient.

Revascularization of ischemic bronchial anastomoses by an intercostal pedicle flap.

Ischemia of the donor bronchus, perfused solely by retrograde collaterals from the pulmonary circulation, is an important factor in the impaired healing of the bronchial anastomosis of transplanted lungs. The healing of two experimental models of bronchial anastomotic ischemia, the bronchial segmental autograft and the postpneumonectomy bronchial autograft, was assessed in dogs. The application of a polytetrafluoroethylene wrap to the bronchial segmental autograft and the application of an intercostal pedicle flap to the postpneumonectomy bronchial autograft, with and without concomitant administration of corticosteroids, were also studied to elucidate factors that affect bronchial anastomotic healing.

Simulation of colonic carcinoma by ischemia.

Nine cases of colonic ischemia are presented in which an initial diagnosis of carcinoma was made from roentgenographic, endoscopic, or intraoperative appearance of the lesion. The clinical features were insufficient to differentiate colonic ischemia from carcinoma. In 7 patients a barium enema was interpreted as, or consistent with, carcinoma.