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Tabrah FL, Tanner R, Vega R, Batkin S. Baromedicine today--rational uses of hyperbaric oxygen therapy. Hawaii Med J 1994; 53:112-5, 119. [PMID: 8045777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Compressed air, and more recently hyperbaric oxygen, have been used and misused in medical treatment for more than 300 years. Advances in physiology have led to rational protocols for hyperbaric oxygen use. Hyperbaric oxygen will enhance wound healing by fibroblast and capillary proliferation, suppress infection, reduce edema, reverse CNS damage from carbon monoxide and cyanide poisoning, and reduce clostridial alpha toxins. Monoplace and multiplace chambers are used for treatment during which EKG and oxygen tissue monitoring, as well as hemodynamic and respiratory support, can be continued, iatrogenic air embolism and diving decompression sickness demand immediate treatment. Investigative uses of adjunct therapy for several other clinical problems include treatment of MS, acute spinal cord injuries, and acute MI. Specific indications agreed on by the Undersea and Hyperbaric Medicine Society are recognized by most third-party payers including Medicare, Champus, and HMSA. Hyperbaric medicine remains a fertile area for basic physiologic investigation and outcomes research.
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Affiliation(s)
- F L Tabrah
- Department of Physiology, University of Hawaii John A. Burns School of Medicine, Straub Clinic and Hospital, Inc
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102
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Gutiérrez G, Guiscafré H, Reyes H, Pérez R, Vega R, Tomé P. [Reduction in the mortality from acute diarrheal diseases. The experiences of an action-research program]. Salud Publica Mex 1994; 36:168-79. [PMID: 8073333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
In order to accelerate the descending mortality rate of acute diarrhea in children under five years of age in Mexico, six strategies were implemented. The results showed that after nine months, 49 per cent of mothers had been trained, and improved significantly their home management of diarrhea. The use of oral rehydration salts increased from 10 to 30 per cent; use of oral rehydration therapy increased from 77 to 83 per cent; and timely and appropriate demand for medical help increased from 51 to 62 per cent (p < 0.05). One hundred percent of all physicians received training, and they improved their therapeutic practices, as shown by a decrease in the use of antibiotics from 48 to 34 per cent; prescription of restrictive diets diminished from 33 to 4 per cent; and oral rehydration therapy increased from 74 to 87 per cent. Thirty-four verbal autopsies were carried out, and they showed that 70 per cent of the children who died did so in their homes or in their way to the hospital, despite the fact that 94 per cent of them had received medical care previous to their death, and that 84 per cent of these had been seen by a doctor within 24 hours previous to their death. In 85 per cent of these cases, the physician involved was a private physician of rural or marginal areas. Monthly analysis of death certificates showed that, during the first year of the program (1991), deaths due to diarrhea diminished 20 per cent, while the corresponding figure for 1992 was 52 per cent. In conclusion, the combination of strategies followed in the program made it possible to accelerate, on a short-term basis, the descending trend of deaths due to diarrhea. It was also shown that an intervention project such as the one presented here may efficiently link results from research to decisions taken by policy-makers, and that these can be effectively turned into actions.
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Affiliation(s)
- G Gutiérrez
- Grupo Interinstitucional de Investigación en Sistemas de Salud, Secretaría de Salud, Instituto Mexicano del Seguro Social, México
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103
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Abstract
This study aimed to define the pharmacology and physiological role of the N-methyl-D-aspartate (NMDA) receptor in the synapse between the hair cells and primary afferent neurons in the vestibular system. The spontaneous and mechanically evoked spike discharges of vestibular nerve fibers were extracellularly recorded in isolated inner ear from the axolotl (Ambystoma tigrinum). Pressure ejection of NMDA (10(-6) to 10(-3) M) elicited a dose-dependent increase of the basal spike discharge from the vestibular nerve fibers. Extracellular magnesium antagonized the NMDA effect in a dose-dependent manner. D(-)-2-amino-5-phosphonovaleric acid (AP5, 10(-5) to 10(-3) M) and 7-chloro-kynurenic acid (7ClKyn, 10(-6) to 10(-3) M) inhibited the basal activity of the vestibular nerve fibers. 7ClKyn also diminished the responses elicited by the mechanical stimulation of the preparation. Glycine (10(-9) to 10(-6) M) applied by bath substitution enhanced the NMDA response, and the glycine agonist D-serine partially reversed the 7ClKyn inhibitory action. These results suggest that NMDA receptors participate in the generation of the basal spike discharge of vestibular system primary afferent neurons, but its activation is not critical for the response to brief mechanical stimuli.
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Affiliation(s)
- E Soto
- Centro de Ciencias Fisiológicas-ICUAP, Universidad Autónoma de Puebla, México
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104
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105
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Abstract
Details are described here for using a rotating gel to perform pulsed field agarose gel electrophoresis (PFGE) with programmable control of the following variables: magnitude of the electrical field, polarity of the electrical field, temperature of the gel and position of the rotating disk upon which the agarose gel rests. By use of this procedure for programmable control, modes of PFGE have been explored that have the following characteristics: (i) resolution by DNA length is completely lost for DNA shorter than a critical length that increases as the pulse times increase, and (ii) resolution by DNA length is enhanced for longer DNAs that are shorter than a second critical length. This window of resolution can be moved to the position of the 2-6 Mb chromosomes of Schizosaccharomyces pombe.
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Affiliation(s)
- M F Arshad
- Department of Electrical and Computer Engineering, University of Texas, Austin
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106
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Abstract
This study aimed to define the acute electrophysiological effects of the perilymphatic perfusion of streptomycin in the sensory apparatus of the semicircular canals of the frog. The ampullary DC potential, the vestibular nerve multiunit discharge, the nerve DC potential and the unitary EPSP activity were recorded in isolated semicircular canals of the frog (Rana esculenta L). The results demonstrated that perilymphatic microperfusion of streptomycin (0.1, 0.3, 1 and 3 mM) reduced both resting and mechanically evoked afferent discharge, while the response of the hair cells remains unchanged. Intracellular recordings from single afferent axons showed that the reduction of the afferent discharge was mainly due to a reduction of the amplitude, but not the frequency, of the EPSPs. These results indicate that streptomycin, when applied in the fluid bathing the synaptic pole of the sensory cells, can act as an antagonist of the vestibular afferent transmitter at the postsynaptic level.
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Affiliation(s)
- G Zucca
- Istituto di Fisiologia Generale, Università di Pavia, Italy
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107
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Vega N, Fernandez A, Hortal L, Macias M, Rodriguez JC, Plaza C, Perdomo M, Vega R, Palop L. Peritoneal dialysis efficiency in CAPD patients in treatment with rHuEPO. Adv Perit Dial 1992; 8:467-70. [PMID: 1361850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
Possible modifications in peritoneal behaviour that can be caused by erythropoietin (EPO) treatment and/or correction of anemia in the ultrafiltration and peritoneal diffusion were studied in 24 CAPD patients. The evolution of the patients on the medium run was also studied. The dialysate to plasma ratio, the peritoneal clearance and the mass transfer coefficient of urea and creatinine and the ultrafiltration volume were studied, baseline, after reaching the hemoglobin target, and after eight months of treatment. The group of patients developed a decrease in the dialysate to plasma ratio and in the peritoneal clearance of creatinine. After evaluating the effects of the hemoglobin and the hematocrit, we found a decrease in the dialysate to plasma ratio of urea and creatinine, and in the peritoneal clearance of creatinine. A decrease was also found in the mass transfer coefficients of urea and creatinine. An increase in the ultrafiltration was also found in the patients with hemoglobin levels higher or equal to 11 g/dl. Those changes are reversible after turning the hemoglobin levels back to levels lower than 11 g/dl.
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Affiliation(s)
- N Vega
- Hospital Ntra. Sra. del Pino, Las Palmas de Gran Canaria, Canary Islands, Spain
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108
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Abstract
It has been suggested that streptomycin might be an antagonist of the glutamate receptors, and that it selectively blocks quisqualic acid receptors. We studied whether streptomycin blocks the responses to excitatory amino acid agonists on the vestibular system primary afferents, and if it allows us to differentiate between kainate (KA) and quisqualate (QA) receptor mediated responses. The experiments were performed in the axolotl (Ambystoma tigrinum). Intra- and extracellular records of the electrical activity of semicircular canal afferent fibers were obtained. Drugs were applied by pressure ejection in volumes of 20 microliters in a 10 ml bath. Streptomycin (0.01-10 mM), induced a dose dependent reversible inhibition of the basal spike discharge of the afferent fibers. This coincided with a reduction in the amplitude of excitatory postsynaptic potentials (EPSP) recorded intracellularly in the afferent fibers. Streptomycin also blocked the excitatory action produced by KA and QA; increasing concentrations of streptomycin produced a rightward shift in the concentration-response curves for both KA and QA. This action persisted even in a high Mg2+ (10 mM), low Ca2+ (0.09 mM) Ringer solution, indicating its postsynaptic nature. These results show that streptomycin might be a non-selective excitatory amino acid (EAA) receptor antagonist.
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Affiliation(s)
- M E Pérez
- Universidad Autónoma de Puebla, Departamento de Ciencias Fisiológicas-ICUAP, Puebla Pue, México
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109
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Ochs J, Brecher ML, Mahoney D, Vega R, Pollock BH, Buchanan GR, Whitehead VM, Ravindranath Y, Freeman AI. Recombinant interferon alfa given before and in combination with standard chemotherapy in children with acute lymphoblastic leukemia in first marrow relapse: a Pediatric Oncology Group pilot study. J Clin Oncol 1991; 9:777-82. [PMID: 2016619 DOI: 10.1200/jco.1991.9.5.777] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Recombinant interferon alfa (rIFN-alpha) was given to 31 children with acute lymphoblastic leukemia (ALL) in first on-therapy marrow relapse as the sole treatment (30 megaunits/m2/d intravenously x 10 days) before standard four-drug reinduction and during multiagent continuation therapy (30 megaunits/m2 subcutaneously x 3 consecutive days every 3 weeks). After 10 days of rIFN-alpha, there were two partial remissions (PRs); seven additional patients had either greater than or equal to 25% reduction in the percentage of marrow blast cells or hypoplastic marrow. Two patients had progressive disease with an increase in leukocyte counts. All patients experienced influenza-like symptoms, and there were isolated instances of severe abdominal pain and personality change. Dose-limiting toxicity comprised grade III/IV transaminase elevation (two patients) and syncope with personality change (one patient). Twenty-three of 31 children (74%) subsequently achieved marrow remission using standard agents. One patient was taken off study during teniposide (VM-26) and cytarabine (ara-C) consolidation due to toxicity. Continuation therapy including rIFN-alpha pulse was well tolerated in the remaining children; only one patient required rIFN-alpha dosage reduction (for CNS toxicity). rIFN-alpha toxicity did not necessitate reductions in doses of standard chemotherapy agents or significant delays in therapy. Five patients remain in remission at 26+ to 36+ months; 13 patients relapsed in marrow, one in the meninges (7 months), and one in meninges, mediastinum, and lymph nodes (2 months). Two children were removed from study for marrow transplant. In summary, high-dose rIFN-alpha alone had a modest antileukemic effect. In contrast to the clinical experience with combined rIFN-alpha and chemotherapy in adults, rIFN-alpha given in a pulse-like manner throughout continuation therapy did not compromise the intensity of the standard chemotherapy regimen.
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Affiliation(s)
- J Ochs
- St Jude Children's Research Hospital, Memphis, TN
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110
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Gunion JF, Vega R, Wudka J. Naturalness problems for rho =1 and other large one-loop effects for a standard-model Higgs sector containing triplet fields. Int J Clin Exp Med 1991; 43:2322-2336. [PMID: 10013615 DOI: 10.1103/physrevd.43.2322] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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111
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Ravindranath Y, Steuber CP, Krischer J, Civin CI, Ducore J, Vega R, Pitel P, Inoue S, Bleher E, Sexauer C. High-dose cytarabine for intensification of early therapy of childhood acute myeloid leukemia: a Pediatric Oncology Group study. J Clin Oncol 1991; 9:572-80. [PMID: 2066754 DOI: 10.1200/jco.1991.9.4.572] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
In June 1984, the Pediatric Oncology Group (POG) initiated a pilot study (8498) using high-dose cytarabine (HdA; 3 g/m2) for intensification of early therapy in childhood acute myelogenous leukemia (AML) (group I). Remission induction therapy consisted of two courses of daunorubicin, cytarabine (Ara-C), and thioguanine (DAT). Postremission therapy consisted of four sequential courses, each consisting of (1) four doses of HdA (HdA4) followed by asparaginase (L-Asp), (2) etoposide (VP) plus azacytidine (Az), (3) prednisone, vincristine, methotrexate, and mercaptopurine (POMP), and (4) Ara-C daily for 5 days by continuous infusion. Six doses of intrathecal Ara-C were given for CNS prophylaxis. In December 1986, the protocol was amended (group II) to substitute six doses of HdA (HdA6) for the second DAT (two + five) induction course; postinduction, a single course of HdA6 was given instead of four HdA/L-Asp courses, and the remainder of the therapy was unchanged. One hundred forty group I patients and 145 group II patients were assessable. The two groups were similar with regard to clinical prognostic groups. No significant differences were noted in the two groups with regard to remission induction (85% [SE = 2%] in each group), induction deaths (6.5% v 7.0%), or deaths in remission (one in each group). Cerebellar toxicity was reported in three patients in group II (with HdA6) but none in group I (HdA4). At present, patients who received HdA6 (group II) had higher event-free survival than patients in group I (EFS at 3 years, 34% [SE = 11%] v 29% [SE = 4%]), and disease-free survival (DFS at 3 years, 42% [SE = 14%] v 34% [SE = 4%]), but the differences were not statistically significant. In both groups, children less than 2 years and those with WBCs less than 100,000/microL had significantly better outcome (EFS of 55% [SE = 10%] and 36% [SE = 5%] at 3 years, respectively) than children greater than or equal to 2 years and those with WBCs greater than or equal to 100,000/microL (EFS of 27% [SE = 5%] and 20% [SE = 9%] at 3 years, respectively.
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112
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Pappo A, Dubowy R, Ravindranath Y, Alvarado C, Rao S, Whitehead VM, Vega R, Kamen B, Vietti T. Phase II trial of trimetrexate in the treatment of recurrent childhood acute lymphoblastic leukemia: a Pediatric Oncology Group study. J Natl Cancer Inst 1990; 82:1641-2. [PMID: 2145440 DOI: 10.1093/jnci/82.20.1641] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- A Pappo
- University of Texas, Southwestern Medical Center, Dallas 75235-9063
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113
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114
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Whitehead VM, Bernstein ML, Vega R, Vats T, Dyment P, Vietti TJ, Krischer J. Phase I trial of indicine-N-oxide in children with leukemia and solid tumors: a Pediatric Oncology Group study. Cancer Chemother Pharmacol 1990; 26:377-9. [PMID: 2208580 DOI: 10.1007/bf02897298] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A phase I trial of indicine-N-oxide was carried out in 12 children with solid tumors and in 16 with leukemia. Doses of 5, 6, and 7.5 g/m2 were given parenterally as a 15-min infusion every 3 weeks. The maximum tolerated dose in patients with solid tumors was 7.5 g/m2 and the dose-limiting toxicity was myelosuppression. In leukemia, the maximum tolerated dose was 6.0 g/m2 and hepatotoxicity was dose-limiting. Half of the children with leukemia showed elevations in transaminase levels and one child died of massive hepatic necrosis. This hepatotoxicity limits the use of indicine-N-oxide in children with leukemia. Antineoplastic activity was limited to a transient reduction in the numbers of circulating leukemic cells.
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115
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Soto E, Vega R. Teaching field potentials: a microcomputer simulation of the nerve action potential in a bidimensional conductor. Int J Biomed Comput 1990; 26:211-20. [PMID: 2242938 DOI: 10.1016/0020-7101(90)90044-u] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A computer simulation of the extracellular field potential recording of nerve activity is presented. An experimental setup composed of an oscilloscope, a nerve, a conductive surface, and a recording electrode is graphically simulated. The user may study the influence of the position of the recording electrode and of certain nerve properties (membrane potential, velocity of conduction and action potential duration), on the action potential shape. The different waves which constitute the action potential may be analyzed and their peak values plotted as a function of the independent variable (e.g. electrode distance from the nerve). Three-dimensional plots of a set of action potentials as a function of the independent variable may also be obtained. The stimulation allows the user to study the basic factors which determine the configuration of an extracellularly recorded compound nerve action potential.
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Affiliation(s)
- E Soto
- Universidad Autónoma de Puebla, Departamento de Ciencias Fisiológicas-ICUAP, Mexico
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116
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Rubinstein H, Marticorena B, Masih D, Borletto N, Vega R, Varengo H, Negroni R. Isolation of human fungi from soil and identification of two endemic areas of Cryptococcus neoformans and Coccidioides immitis. Rev Inst Med Trop Sao Paulo 1989; 31:1-6. [PMID: 2682978 DOI: 10.1590/s0036-46651989000100001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The present study was carried out in two different areas of Province of Cordoba, Argentina, where there was a suspicious of endemic mycosis. The previous data were the presence of a clinical case of pulmonary cryptococcosis in one area (Alta Gracia) and the previous findings of a high incidence of coccidioidin and cryptococcin reactors in the population of the second one (Villa Dolores). In both areas soil samples for fungi were studied and Cryptococcus neoformans was found in 2/25 samples from Alta Gracia. In Villa Dolores Coccidioides immitis was isolated in 2/40 samples, and C. neoformans in 1/40 samples. Delayed hypersensitivity test with cryptococcin was determined in the population from Alta Gracia and it was found to be 5.3%. Positive cutaneous tests with coccidioidin (33.8%) and cryptococcin (31.9%) in Villa Dolores were obtained. With these findings two endemic areas of systemic mycoses in Cordoba, Argentina were delimited.
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117
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Abbasabadi A, Repko WW, Dicus DA, Vega R. Comparison of exact and effective-gauge-boson calculations for gauge-boson fusion processes. Phys Rev D Part Fields 1988; 38:2770-2775. [PMID: 9959449 DOI: 10.1103/physrevd.38.2770] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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118
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Soto E, Vega R. Actions of excitatory amino acid acid agonists and antagonists on the primary afferents of the vestibular system of the axolotl (Ambystoma mexicanum). Brain Res 1988; 462:104-11. [PMID: 3052698 DOI: 10.1016/0006-8993(88)90591-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In order to determine the nature of the transmitter in the synapse between hair cells and primary afferent fibers, both resting and evoked spike activity of vestibular system afferents were recorded. Excitatory amino acid agonists and antagonists were applied by micro perfusion. Excitatory amino acid agonists consistently increased the firing rate of these afferents. The rank order in potencies of the agonists tested was: kainate greater than or equal to quisqualate greater than D-aspartate greater than or equal to L-glutamate greater than or equal to L-aspartate greater than N-methyl D-aspartate. Blockade of synaptic transmission with high-Mg2+ and low-Ca2+ solutions did not seem to affect the responses to the excitatory amino acid agonists indicating their postsynaptic action. Excitatory amino acid antagonists inhibit both resting and physiologically evoked activity. The rank order of inhibitory potency was: kynurenate greater than L-glutamate diethyl ester greater than D,L-2-amino-4-phosphono-butyrate greater than D-alpha-amino adipate greater than D,L-2-amino-5-phosphonovalerate. These findings suggest that an amino acid-related compound may be the transmitter at this synapse. The relative potencies of agonists and antagonists tested provide evidence that the transmitter released from the hair cells' basal pole in the axolotl vestibular system interacts with postsynaptic kainic/quisqualic type receptors.
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Affiliation(s)
- E Soto
- Departamento de Ciencias Fisiológicas, ICUAP, Universidad Autónoma de Puebla, Mexico
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119
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Rojas-Espinosa O, Vega R, Oltra A, Arce P, Nunez A. Transitory macrophage activation in the granulomatous lesions of Mycobacterium lepraemurium-induced lepromatoid leprosy in the mouse. Int J Lepr Other Mycobact Dis 1988; 56:428-36. [PMID: 3047284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A kinetic study on the evolution of granulomas that appear in the liver of NIH mice inoculated with 10(8) Mycobacterium lepraemurium by the intraperitoneal route has been performed. The liver was chosen because of its nonlymphoid histology which allowed us to visualize the appearance and maturation of the cell infiltrates generated as a consequence of the mycobacterial infection. The study analyzed both the macrophage activation within the granulomas and the fate of bacilli within the macrophage. The results showed that this mycobacteriosis induces a relatively early macrophage activation (a very likely result of a cell-mediated immune response triggered by the bacilli) that peaks between 45 and 60 days postinoculation, fades thereafter, and practically disappears several days later. Bacilli are susceptible to the microbicidal effects of activated macrophages, but when the macrophages are turned off (probably due to active suppressive mechanisms), the surviving bacilli reinitiate the infection with no further macrophage opposition. As a result, more phagocytes are attracted to the infection sites and the cell infiltrates grow steadily to become confluent, increasing the granuloma fraction and eventually replacing the liver parenchyma. The findings suggest that in murine "leprosy" infection, early immunological changes occur that enable the macrophages present in the granulomas to kill the infecting M. lepraemurium regardless of the eventual lepromatoid evolution of the granulomas. Lepromatoid granulomas in the mouse and lepromatous granulomas in man are equivalent structures in regard to their histology and bacteriology.
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Affiliation(s)
- O Rojas-Espinosa
- Department of Immunology, National School of Biological Sciences, National Polytechnic Institute, México, D.F
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120
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Dicus DA, Vega R. WW production at supercollider energies. Phys Rev D Part Fields 1988; 37:2474-2483. [PMID: 9958965 DOI: 10.1103/physrevd.37.2474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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121
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Vega R, López-Castro A, Márquez R. Structure of 2-amino-3-methyl-5-(D-arabino-1,2,3,4-tetrahydroxybutyl)imidazolium chloride. Acta Crystallogr C 1988. [DOI: 10.1107/s010827018700920x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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122
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Rieumont J, Vega R, Davidenko N, Paz J. Sensitivity analysis in retarded radical polymerization of vinyl acetate in the presence of furan compounds. Eur Polym J 1988. [DOI: 10.1016/0014-3057(88)90168-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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123
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Diánez MJ, Vega R, López-Castro A, Márquez R. Structure of a galacto-benzofuranone oxime. Acta Crystallogr C 1987. [DOI: 10.1107/s0108270187092680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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124
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Abstract
This study was undertaken to determine the possible role of GABA as an afferent transmitter in the vestibular system of the axolotl. We studied the effects of GABA, muscimol, bicuculline and picrotoxin on the spontaneous spike discharge of the afferent fibers of the sacculi lagena and anterior semicircular canal. It was found that GABA and muscimol produce a very weak excitatory effect which does not mimic either the temporal course or the amplitude of the response of vestibular afferents to physiological stimuli. The GABA antagonist bicuculline has no significant effect on these fibers, and picrotoxin partially blocks the spontaneous activity in 33% of the fibers studied. These results indicate that GABA is probably not an afferent transmitter in the vestibular system as has previously been proposed.
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125
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Abstract
A Turbo Pascal program for data acquisition and analysis is presented. The program detects incoming data as TTL pulses through the serial port of an IBM-PC and compatible computers and displays the instantaneous frequency plot and the interval histogram on-line. Novel features of this Pascal program are: no special hardware requirements and on-line analysis of more than one source at a time. No hardware additions to the supplied computer and easy operation make this program a valuable tool, directly useable in an IBM-PC and compatible computers.
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126
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127
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128
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Vergara R, Salas I, Rodríguez I, Rosales E, Serman F, Soto J, Torres R, Vatter C, Vega R. [Epidemiology of cerebrovascular disorders in the Eastern Metropolitan Health Service, Santiago, Chile]. Rev Med Chil 1986; 114:665-73. [PMID: 3602707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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129
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Abstract
Eighteen children born to parents who had previously received chemotherapy or radiotherapy were examined for physical health, growth, and development. The immunologic and the hematologic status of these children was also evaluated. Their ages ranged from birth to 15 years. The children had a careful history and physical examination to detect any abnormal symptoms or signs, and the parent's previous treatment was carefully documented. Four sets of parents had children while one of the parents was on active treatment (2 male and 2 female). Of the male patients, one patient's wife had a baby that was "small for gestational age" at birth and had transient failure to thrive; the other child was normal. Of the female patients, one offspring was small for gestational age at birth and the other was normal, but both continued to have failure to thrive for up to 17 months and 26 months, respectively. Ten parents procreated after being treated with chemotherapy and/or radiotherapy, to whom 14 children were born. One child was a stillbirth with multiple congenital abnormalities, and another child had trisomy 13-15 and died 6 months later. The other 12 children were normal at birth, but one child is under the 5th percentile for growth at twelve months of age. In all children studied, immune function test, complete blood count, and viral titers were considered normal for age. In our study, we found that three out of four children born to parents who were on chemotherapy had failure to thrive. Of the 14 children born to parents who conceived after being off chemotherapy, 11 were found to be normal in growth and development. These results imply that there is a high risk of complications in children born to parents who procreated while receiving chemotherapy. Further studies are needed to develop better guidelines for counseling cancer patients who want to have children.
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130
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Germain A, Vega R, Llanos JA. [Naloxone increases systemic arterial pressure during fetal asphyxia. Modulator role of endogenous opioids]. Rev Med Chil 1985; 113:839-43. [PMID: 3837310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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131
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Vega R, Diánez MJ, López-Castro A, Márquez R. The structure of ethyl 5,6,7,8,9-pentaacetoxy-2-amino-4-nitromethyl-D-glycero-D-manno-2-nonene-3-carboxylate, C23H34N2O14: erratum. Acta Crystallogr C 1985. [DOI: 10.1107/s0108270185007430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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132
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Chang TT, Gulati SC, Chou TC, Vega R, Gandola L, Ibrahim SM, Yopp J, Colvin M, Clarkson BD. Synergistic effect of 4-hydroperoxycyclophosphamide and etoposide on a human promyelocytic leukemia cell line (HL-60) demonstrated by computer analysis. Cancer Res 1985; 45:2434-9. [PMID: 3857119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Autologous stem cell transplantation using cryopreserved bone marrow offers the opportunity to rescue patients from hematopoietic toxicity caused by intensive chemotherapy. This approach is potentially useful for high-risk leukemias as well as for other cancers. The development of suitable methods for purging malignant cells from the bone marrow will offer a better chance of success for autologous stem cell transplantation. In this paper, we describe our efforts at purging myeloid cells. HL-60, a promyelocytic leukemia cell line, was used as a model. 4-Hydroperoxycyclophosphamide (4-HC) and VP-16-213 (VP-16) (either alone or in combination) were used to treat HL-60 cells and normal bone marrow. The cytotoxic effect of 4-HC (29.2 micrograms/ml; 100 microM) upon the HL-60 cell line was 99.8 +/- 0.12% (SE), and the colony-forming units-granulocyte, macrophage (CFU-cs) of normal bone marrow was inhibited by 82.5%. VP-16, at a concentration of 25 micrograms/ml (42.5 microM), can kill 99% of HL-60 cells and inhibit 72.7% of the CFU-cs. A drug mixture containing 4-HC (29.2 micrograms/ml) and VP-16 (10 micrograms/ml) (combination ratio, 1:0.342) reduces HL-60 cells to an undetectable number, and the CFU-cs were inhibited by 87.2%. The laboratory data were further analyzed for the synergistic effect of these two drugs by quantitative determination of the median effect plot and the multiple drug equation recently described by Chou and Talalay (Adv. Enz. Regul., 22: 27-55, 1984). Interactions of two drugs at different effect levels and at different combination ratios were then determined by computer simulation. At high effect levels, 4-HC and VP-16 in combination gave a synergistic cytocidal effect on HL-60 leukemic cells and gave an antagonistic inhibitory effect on normal bone marrow CFU-cs. This combination greatly increases the safety margin. Computer simulation of a dose effect relationship has also shown that the 4-HC:VP-16 combination ratio of 1:0.342 yields a better selective effect than a ratio of 1:0.856. This quantitative analysis suggests that the combination of these two drugs at the selected dose level offers a good method for purging nonlymphoblastic leukemia cells.
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Vega R, Diánez MJ, López-Castro A, Márquez R. The structure of ethyl 5,6,7,8,9-pentaacetoxy-2-amino-4-nitromethyl-D-glycero-D-manno-2-nonene-3-carboxylate, C23H34N2O14. Acta Crystallogr C 1984. [DOI: 10.1107/s0108270184010143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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134
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Kertesz D, Felipe F, Vega R. [Surgical treatment of saddle-back nose using autogenous bone graft]. Rev Cubana Estomatol 1984; 21:315-25. [PMID: 6399589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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135
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Gulati SC, Vega R, Gandola L, Gulati C, Yopp J, O'Reilly R, Clarkson B. Neuroblastoma. Indian J Pediatr 1983; 50:661-5. [PMID: 6389330 DOI: 10.1007/bf02957736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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136
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Gulati SC, Gulati C, Vega R, Gandola L, Yopp J, Dinsmore R, O'Reilly R, Clarkson B. Non-Hodgkin's lymphoma. Indian J Pediatr 1983; 50:667-74. [PMID: 6389331 DOI: 10.1007/bf02957737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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137
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Vega R, López-Castro A, Márquez R. Structure of methyl 5,6,7,8,9-pentaacetoxy-2-amino-4-nitromethyl-D-glycero-L-gluco-2-nonene-3-carboxylate, C22H32N2O14. Acta Crystallogr C 1983. [DOI: 10.1107/s0108270183005132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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138
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Schuckit MA, Shaskan E, Duby J, Vega R, Moss M. Platelet monoamine oxidase activity in relatives of alcoholics. Preliminary study with matched control subjects. Arch Gen Psychiatry 1982; 39:137-40. [PMID: 7065827 DOI: 10.1001/archpsyc.1982.04290020009002] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Platelet monoamine oxidase (MAO) activity levels were determined before and 180 minutes after ingestion of ethyl alcohol in 30 healthy men aged 21 to 25 years. The subjects included 15 men with alcoholic first-degree relatives who were matched by demography, height-weight ratio, and drinking history with 15 control subjects who had no family history of alcoholism. There was a nonsignificant trend toward lower platelet MAO activities at baseline and after ethyl alcohol ingestion in the group with alcoholic relatives when compared with the control subjects who had no family history of alcoholism. With an arbitrary MAO cutoff of 5.24 nmole/mg of protein per hour, eight of the 15 subjects with alcoholic relatives and 12 of the 15 without alcoholic relatives were correctly identified. However, because of the number of false-positive and false-negative findings, the results have limited clinical usefulness.
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139
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Schuckit MA, O'Connor DT, Duby J, Vega R, Moss M. Dopamine-beta-hydroxylase activity levels in men at high risk for alcoholism and controls. Biol Psychiatry 1981; 16:1067-75. [PMID: 7349621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Plasma DBH activity levels were determined for 22 nonalcoholic young men with alcoholic close relatives (the FHP or family history positive group) and results compared to family history negative (FHN) controls matched on demography, height/weight ratio, and drinking history. These enzyme levels were then correlated with the usual drinking history over the prior 6 months and with the intensity of intoxication achieved after drinking 0.75 ml of ethanol/kg body weight. The FHP men demonstrated a 20% lower level of DBH (p greater than 0.1) indicating no significant difference between the groups. Base-line DBH activities correlated significantly with the level of intoxication for the FHN group (r = 0.44, p less than 0.025) with a trend for an inverse correlation with the average drinking history. FHP men, on the other hand, demonstrated only a nonsignificant association between peak intoxication level and base-line DBH and a positive correlation (r = 0.37, p less than 0.05) with the average number of drinks/drinking day. These results are not consistent with the probability that a premorbid DBH assay could be used as one indicator of propensity towards alcoholism. The differences between FHP and FHN groups on correlations between DBH and peak intoxication or usual drinking history raise speculations that the "normal" (FHN) relationship between alcohol intake and plasma DBH activity may be impaired in individuals at high risk (FHP) for the future development of alcoholism.
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140
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Marin F, Vega R. [Smoking habits among students in the health sector]. Bol Oficina Sanit Panam 1981; 91:191-9. [PMID: 6459102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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141
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Vega R, Dianez MJ, López Castro A, Márquez R. Conformational analyses of α-(1-nitropolyacetoxy-2-heptyl)-β-alkylamino-crotonic acid esters by X-ray diffraction. Acta Crystallogr A 1981. [DOI: 10.1107/s0108767381093537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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142
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Vega R, López-Castro A, Márquez R. The structure of ethyl 5,6,7,8,9-pentaacetoxy-2-butylamino-4-nitromethyl-D-glycero-L-gluco-2-nonene-3-carboxylate. Acta Crystallogr B Struct Sci 1981. [DOI: 10.1107/s0567740881005128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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143
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Vega R, Jimenez-Garay R, López-Castro A, Márquez R. The structure of 3-methyl-3-(3-methyl-aminopropyl)-1-phenyl-2-indolinone hydrochloride. Acta Crystallogr Sect B 1980. [DOI: 10.1107/s0567740880009740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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144
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145
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146
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Vega R, Hernández-Montis V, López-Castro A. The crystal structure of 1-p-bromophenyl-4,5-(1,2-cis-D-glucofurano)imidazolidine-2-thione. ACTA ACUST UNITED AC 1976. [DOI: 10.1107/s0567740876005359] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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147
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Abstract
The genetic mechanisms associated with ampicillin resistance in strains of Haemophilus influenzae type b were investigated. In experiments concerned with transfer of total deoxyribonucleic acid in vitro, expression of resistance by wild-type strains occurred at a frequency of about 10%. The minimum inhibitory concentration of ampicillin for the transformed strains was similar to that of the resistant donor strains, and resistance in transformants was associated with acquisition of the ability to produce beta-lactamase. Exposure to 39 mug of acridine per ml for 18 h cured resistance at a frequency of 80%, and there was spontaneous loss of resistance after repeated subculture of some strains. Analysis by cesium chloride-ethidium bromide density gradient centrifugation demonstrated the presence of extrachromosomal deoxyribonucleic acid in the resistant strains, providing further evidence that the resistance factor is plasmid mediated.
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