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Biomedical subjects

D Baker

Publications and source records attributed to D Baker.

At least 325 records · Page 18Linked to original sources
PubMed1987

Lesions of potato sprout and extracted potato sprout alkaloid toxicity in Syrian hamsters.

Hamsters were gavaged either dried potato sprout material, alkaloid extract of potato sprouts, or the marc from which the alkaloid fraction was extracted and then were examined for gross and microscopic lesions. Nine of 10 hamsters receiving dried potato sprout material and 3 of 5 hamsters receiving alkaloid extract had severe gastric and intestinal mucosal necrosis which was most severe in the glandular stomach, duodenum and proximal jejunum. All control hamsters gavaged with water and all hamsters gavaged with the potato sprout marc survived to the time of euthanasia and did not have gross or microscopic lesions.

Alkaloids↗
PubMed1987

Induction of sensitization and tolerance in contact sensitivity with haptenated epidermal cells in the guinea-pig.

Haptenated murine Langerhans' cells (LCs) have been reported to induce contact sensitivity when injected via the subcutaneous, intraperitoneal and, in some instances, the intravenous route. Similar studies were undertaken to elucidate the role of the LC in the induction of contact sensitivity in the guinea-pig. The subcutaneous injection of dinitrophenylated epidermal cells induced hapten-specific contact sensitivity in a dose-dependent fashion. This contrasts with the tolerance that was induced by the intravenous or intraperitoneal injection of similarly haptenated cells. Contact sensitivity by haptenated epidermal cells could be induced in syngeneic and allogeneic recipients and did not require the transfer of viable cells. Using the monoclonal antibody MSgp2, which detects LCs, LC-enriched and LC-depleted populations were prepared by an 'indirect antibody' panning technique. It was found that a haptenated LC-depleted epidermal cell population (0.1% LC) induced the same degree of contact sensitivity or tolerance, depending on the route of immunization, as a haptenated 'freshly isolated' epidermal cell population (1% LC). Whereas, a purified population of haptenated LC (85-90%) induced no significant degree of contact sensitivity or tolerance. These results confirm our previous conclusions based the in vivo depletions of Langerhans' cells, and suggest that the epidermal Langerhans' cell is not essential for the induction of contact sensitivity in the guinea-pig. However, this does not exclude the possibility that the LC is involved in the elicitation of contact sensitivity in a sensitized animal.

Animals↗
PubMed1987

Cervical and vaginal pathology in women with vulvar condylomata.

All women referred to the Department of Obstetrics and Gynecology, School of Medicine, State University of New York at Stony Brook, for evaluation of vulvar condylomata were reviewed to identify concurrent cervical and vaginal pathology. Over the five-year period 1981-1985, referrals to our colposcopy clinic for vulvar condylomata increased from 7.8% to 29.2%. All patients underwent a thorough history, physical examination and colposcopic evaluation of the cervix, vulva and vagina. Of the patients with vulvar condylomata, 68% had biopsy-proven cervical and vaginal pathology. While 50% of patients with cervical disease had human papillomavirus infection alone, the other 50% had concurrent cervical intraepithelial neoplasia (CIN) or CIN only. Proper evaluation of patients with vulvar condylomata must include colposcopy of the cervix and vagina.

Cervix Uteri↗
PubMed1987

Infiltrative lipoma in the heart of a horse.

An expansile, yellow, soft mass was observed in the free wall of the right ventricle of a 3-year-old, male, Morgan, horse at necropsy. The mass was composed of well differentiated adipocytes in solid sheets or infiltrating between muscle fibers with associated myofiber degeneration. The mass was interpreted to be an infiltrative lipoma of the heart.

Animals↗
PubMed1986

Trypanosomiasis and laryngeal paralysis in a dog.

Laryngeal paralysis and trypanosomiasis were diagnosed in a 12-year-old Labrador Retriever. Bilateral vocal fold resection and partial excision of the left aryepiglottic fold resolved the dog's respiratory difficulty. Trypomastigotes resembling Trypanosoma cruzi were seen in blood smears during hospitalization. In spite of treatment with nifurtimox and dexamethasone, the dog died. Histologic examination of tissues did not reveal amastigotes of T cruzi or granulomatous myositis previously described in canine trypanosomiasis reported from North America. The lack of granulomatous myositis and amastigotes in muscle is unusual and suggests a strain variation in the behavior of T cruzi.

Animals↗
PubMed1986

Comparison of fatty acid patterns of polar and neutral lipid classes and cyclo-oxygenase activity in taste and non-taste epithelium of steer tongues.

Epithelial tissues and papilla from several regions of the steer tongue were isolated and the fatty acids from each lipid class in the polar and neutral fractions were assayed. The observed profiles indicated regional differences. Arachidonic acid and other fatty acids containing long carbon chains (greater than 22) were found in all tissues sampled, particularly in the phosphatidyls of the inositols, ethanolamines, cholines, and in the cholesterylesters. Production of prostaglandin E2 was measured through cyclo-oxygenase activity and the presence of plasmalogens was observed in the phosphatidylethanolamine and choline fractions. Higher rates of PGE2 synthesis and greater amounts of plasmologens were found in taste-related epithelial samples compared to lingual epithelial control samples not containing taste buds. The heterogeneity of patterns of lipids and fatty acids found in the epithelium of the tongue suggests possible zonal specialization to satisfy regional physiological needs.

Animals↗
PubMed1986

Intravenous gammaglobulin therapy in the management of a patient with idiopathic thrombocytopenic purpura and a warm autoimmune erythrocyte panagglutinin during pregnancy.

Intravenous gammaglobulin (IVIgG) was recently introduced for the treatment of idiopathic thrombocytopenic purpura (ITP). Reported is a previously splenectomized patient who had a severe exacerbation of her ITP during pregnancy and was managed with large doses of IVIgG throughout the second half of her pregnancy. She also had an autoimmune IgG erythrocyte panagglutinin on her red blood cells and in her serum, but only minimal evidence of hemolysis. There was little or no transplacental passage of her autoimmune antibodies since she delivered a normal fetus after 34 weeks of gestation who had a normal platelet count and no evidence of an antierythrocyte antibody. Interestingly, at the time of delivery the mother's serum IgG was dramatically elevated, but the cord serum IgG was normal for the length of gestation, indicating the presence of a dramatic and abnormal difference in IgG between maternal and fetal blood. This raises the possibility that the IVIgG therapy may have actually prevented transplacental passage of the pathological antibodies.

Adult↗
PubMed1986

The influence of levamisole and hyperthermia on the incidence of metastases from an X-irradiated tumor.

Fragments of the KHT sarcoma were transplanted into the right rear legs of C3H/He mice. At 10 days, groups of 16 to 20 mice had the consequent developing tumor treated by local irradiation (40 Gy in 2 fractions), levamisole (5 mg/kg every 2nd day), local hyperthermia, or a combination of these treatments. Local tumor control, the incidence and sites of metastatic spread, and survival times were measured. Radiation alone controlled 25% of the local tumors, but 75% of the treated mice developed metastases. Radiation combined with levamisole increased local control to 31% with a corresponding decrease in the incidence of metastases. Hyperthermia alone prolonged the survival time compared to nontreated mice. This increase in survival time was lost when levamisole was combined with hyperthermia. Combined hyperthermia and irradiation controlled 89% of tumors. This corresponded to a thermal enhancement factor of 3.5. When levamisole was added to hyperthermia and irradiation, local tumor control was decreased and the incidence of metastases was increased compared to the combination treatment of irradiation and hyperthermia. The nonspecific immune stimulant levamisole was antagonistic to the action of hyperthermia on the KHT tumor. An hypothesis to explain this antagonism is proposed.

Animals↗
PubMed1986

Management of factor XI deficiency in gynecologic and obstetric patients.

Deficiency of factor XI (plasma thromboplastin antecedent) can result in severe bleeding in women undergoing obstetric or gynecologic procedures, with the highest risk in women of Ashkenazi Jewish background. Most patients do not bleed if treated with sufficient fresh frozen plasma to maintain a factor XI level of 30% or more but occasionally patients may require higher levels. Plasma infusion should be continued for several days, even if bleeding does not seem excessive, since delayed bleeding is not uncommon. The use of hepatitis B vaccine and of plasma from a single donor, may reduce the risk of hepatitis.

Adult↗
PubMed1985

Neurologic manifestations of the organoid nevus syndrome.

Prominent neurologic abnormalities were observed in six patients with epidermal or linear sebaceous nevi (organoid nevi). These cases were remarkable for unilateral facial nevi, cognitive impairment, seizures, and focal or lateralized epileptic EEG abnormalities. Additional manifestations included the onset of seizures in the neonatal period, unilateral hypsarrhythmia or Lennox-Gastaut EEG pattern, hemiparesis, asymmetric macrocephaly, and somatic growth disturbances. The full expression of this disorder was not apparent at birth, but emerged gradually during infancy. The neurologic abnormalities in these patients were attributed to unilateral or asymmetric malformations of the CNS as demonstrated by computed tomography. A lateralized disorder of neuroectodermal proliferation, differentiation, and migration could account for both the cutaneous and neurologic abnormalities in this disorder. The striking clinical similarities in these patients suggest a close link between epidermal and linear sebaceous nevi.

Abnormalities, Multiple↗
PubMed1985

The phenotypic and cytogenetic spectrum of partial trisomy 9.

A new patient with trisomy for the chromosome segment 9pter----q22 is compared to 19 previously reported cases of partial trisomy 9. Manifestations such as microcephaly, prominent nasal root, bulbous nose, and down-turned corners of the mouth are common to patients with trisomic segments extending from 9p21 to 9q13, while intra-uterine growth retardation, cleft lip/palate, skeletal anomalies, and heart defects are more common with trisomic segments extending through 9q22-9q32. A graphic method illustrates this progression in the partial trisomy 9 malformation spectrum as the triplicated chromosome region extends from bands 9p21 to 9q32. More severe and random defects are observed with complete trisomy 9 or tetrasomy 9p, suggesting an extreme excess of material greatly increases developmental variability.

Abnormalities, Multiple↗
PubMed1985

Correlation of postcoital evaluation with in vitro sperm cervical mucus determinations and ureaplasma cultures.

Fifteen trials were completed in 14 couples during an infertility evaluation. The postcoital test (PCT) was accomplished in a standardized manner. Also, standardized determinations of the sperm-cervical mucus penetration test (SCMPT) with the addition of cross-testing (X-test) utilizing bovine cervical mucus (BCM) and normal donor semen (NDS) were done. Male and female samples were also cultured for Ureaplasma urealyticum using U9-B indicator broth and A-7 agar. The PCT and SCMPT agreed in 87% (13/15) of the cases. Utilizing BCM and NDS, where possible, the causative factor was the cervical mucus in 54% (7/13); semen factor in 15% (2/13); both factors in 8% (1/13); and undetermined in 23% (3/13). U. urealyticum cultures were positive in 40% (6/15) of the cases. Analysis of the results revealed: (1) significant correlation between PCT and SCMPT (P less than 0.01); (2) no significant difference among the PCT, SCMPT, and X-test, indicating that the cervical mucus was the causative factor; and (3) no U. urealyticum correlation with the PCT or the SCMPT. Thus, laboratory SCMPT and X-test correlated with the PCT, providing additional information concerning the causative factor in infertility. The U. urealyticum status in cervical mucus and semen cannot be determined from the PCT nor the SCMPT.

Adult↗
PubMed1985

Colonic lymphoma in ulcerative colitis.

Only rarely has lymphoma been associated with ulcerative colitis. We report a 25-year-old man with an 8-year history of ulcerative colitis, who developed diffuse large cell lymphoma (histiocytic) of the colon. We review 17 previously reported cases and discuss the risk of lymphoma, diagnostic clues, prognosis, and the evidence for a relationship between ulcerative colitis and lymphoma.

Adult↗