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Su IJ, Hsu YS, Chang YC, Wang IW. Herpesvirus-like DNA sequence in Kaposi's sarcoma from AIDS and non-AIDS patients in Taiwan. Lancet 1995; 345:722-3. [PMID: 7885137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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327
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Chang YC, Wu MH, Lin JL, Young ML, Wang JK, Lue HC. Radiofrequency catheter ablation of supraventricular tachycardias in pediatric patients. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI ZA ZHI [JOURNAL]. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI 1995; 36:113-20. [PMID: 7793276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Supraventricular tachycardia (SVT) is the most common cardiac arrhythmia in children. Atrioventricular (AV) reciprocating tachycardia utilizing an accessory pathway and AV nodal reentrant tachycardia (AVNRT) constitute a majority of SVTs. Radiofrequency energy ablation has recently become the treatment of choice in adults. Initial experience in pediatric patients in this Institute is reported in this study. Six consecutive patients (aged 5-22 years, mean age 13 years; 3 boys, 3 girls) with narrow-QRS SVT were studied from July to October in 1993. They had experienced symptomatic SVT for a mean period of five years (ranged from 1 to 15 years). Anti-arrhythmic agents, including beta-antagonists and calcium channel blockers, were unable to satisfactorily suppress these SVTs. Four of the six patients were shown to have a left-sided concealed accessory connection as the retrograde limb of the reentrant circuit. After identification of the earliest retrograde activation site, a steerable 7F catheter with a 4-mm-long electrode at the distal tip was placed within the left ventricle and positioned against the atrio-ventricular annulus. Another two patients were proved to have AVNRT. The ablation catheter was placed at the posterior/inferior aspect of the tricuspid annulus and guided by putative slow potential. Radiofrequency current was delivered at a power from 15 to 25W for four to six times with a mean duration of 40 seconds in patients with AV reciprocating tachycardia, and a single time in those with AVNRT. All six SVTs were successfully ablated. No complication was noted in any patient. Follow-up for three to seven months has indicated no recurrence of SVT.(ABSTRACT TRUNCATED AT 250 WORDS)
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Wang PJ, Tseng CL, Young C, Liu HM, Chang YC, Shen YZ, Lee CY. Multiple sclerosis in children: clinical, neuroimaging, and neurophysiological correlations. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI ZA ZHI [JOURNAL]. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI 1995; 36:93-100. [PMID: 7793286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Four female children with clinically-definite diagnoses of multiple sclerosis (MS) were studied with multimodal evoked potentials (EPs), electroencephalogram (EEG), cerebrospinal fluid (CSF) analysis, computed tomography (CT) and magnetic resonance imaging (MRI). Correlations among the clinical features, neuroimaging and neurophysiological studies were also evaluated. Their ages of the onset ranged from 5 to 11 years. The clinical evolution in the all four MS cases was relapsing-remitting form. MRI studies in three cases showed abnormal demyelinating plaques in the brainstem, cerebellum and white matter of the cerebrum. CT examination, performed in the other MS case, did not reveal hypodensic lesion. Despite that MRI failed to document optical nerve lesions, three cases had abnormal visual evoked potentials (VEPs). Somatosensory evoked potentials (SSEPs) were abnormal in three cases. Brainstem auditory evoked potentials (BAEPs) were abnormal in two cases presenting with signs of brainstem dysfunction. The conclusion was that paraclinical evidences obtained from MRI and multimodal evoked potential studies are of value as an aid in localizing involved areas and detecting silent lesions in children with MS.
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Chang YC, Smith KD, Moore RD, Serjeant GR, Dover GJ. An analysis of fetal hemoglobin variation in sickle cell disease: the relative contributions of the X-linked factor, beta-globin haplotypes, alpha-globin gene number, gender, and age. Blood 1995; 85:1111-7. [PMID: 7531513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Five factors have been shown to influence the 20-fold variation of fetal hemoglobin (Hb F) levels in sickle cell anemia (SS): age, sex, the alpha-globin gene number, beta-globin haplotypes, and an X-linked locus that regulates the production of Hb F-containing erythrocytes (F cells), ie, the F-cell production (FCP) locus. To determine the relative importance of these factors, we studied 257 Jamaican SS subjects from a Cohort group identified by newborn screening and from a Sib Pair study. Linear regression analyses showed that each variable, when analyzed alone, had a significant association with Hb F levels (P < .05). Multiple regression analysis, including all variables, showed that the FCP locus is the strongest predictor, accounting for 40% of Hb F variation. beta-Globin haplotypes, alpha-globin genes, and age accounted for less than 10% of the variation. The association between the beta-globin haplotypes and Hb F levels becomes apparent if the influence of the FCP locus is removed by analyzing only individuals with the same FCP phenotype. Thus, the FCP locus is the most important factor identified to date in determining Hb F levels. The variation within each FCP phenotype is modulated by factors associated with the three common beta-globin haplotypes and other as yet unidentified factor(s).
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330
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Chang YC, Yeh CY, Wang JD. Subclinical neurotoxicity of mercury vapor revealed by a multimodality evoked potential study of chloralkali workers. Am J Ind Med 1995; 27:271-9. [PMID: 7755016 DOI: 10.1002/ajim.4700270211] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Pattern visual, brainstem auditory, and somatosensory evoked potential (EP) studies were performed on 26 chloralkali workers. The intensity of mercury vapor exposure in these workers was estimated from the individual working history. Mercury levels in blood, urine, and hair were determined with atomic absorption spectrometry. The EP findings were compared with those from individually matched normal subjects. In brainstem auditory and somatosensory EP studies, prolonged neural conduction times in the central nervous system (CNS) were found in workers exposed to mercury vapor. In the pattern visual EP study, mercury workers had higher interpeak amplitudes. Findings of this study suggested that chronic exposure to mercury vapor would affect the CNS functions. A multimodality EP study is a useful adjunct in evaluation of chronic mercury neurotoxicity, especially in an epidemiological study.
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Kimoto T, Nagasue N, Kohno H, Chang YC, Taniura H, Yamanoi A, Uchida M, Takemoto Y, Makino Y, Nakamura T. Repeated hepatic dearterialization for unresectable liver metastases from gastric cancer: review of five cases. HPB SURGERY : A WORLD JOURNAL OF HEPATIC, PANCREATIC AND BILIARY SURGERY 1995; 8:175-80. [PMID: 7547620 PMCID: PMC2423778 DOI: 10.1155/1995/96946] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A novel method of repeated hepatic dearterialization was evaluated in five patients with multiple metastases from gastric cancer in both hepatic lobes. After gastrectomy with extensive lymph node dissection (R2/3), all patients underwent implantation of a vascular occluder around the hepatic artery. Cannulation of the hepatic artery was added for later chemotherapy. The hepatic artery was occluded repeatedly for 1 hour twice daily in combination with intrahepatic infusion of anticancer drugs for as long as possible. Three of five patients demonstrated marked tumour regression with unexpectedly long survival (16 months in two patients and one still alive at 15 months). Carcinoembryonic antigen (CEA) levels decreased to almost normal in four patients who had initially high levels. The present experiences seems to indicate that long survival can be hoped for in patients with advanced gastric cancer with unresectable liver metastases.
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332
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Lee B, Chang YC. Effective mass approach to the RKKY interaction in magnetic multilayers. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:316-325. [PMID: 9977092 DOI: 10.1103/physrevb.51.316] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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333
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Chu TC, Lee CS, Hsu CC, Chang YC, Tsai JL, Pai CF. Convoy electrons for collisions between projectile He+ and C foils from 17.5 to 25 keV/amu. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 51:850-852. [PMID: 9911648 DOI: 10.1103/physreva.51.850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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334
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Lee YH, Wei FC, Lee J, Su MS, Chang YC. Effect of postischemic reperfusion on microcirculation and lipid metabolism of skeletal muscle. Microsurgery 1995; 16:522-7. [PMID: 8538427 DOI: 10.1002/micr.1920160803] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
To study the effect of ischemia reperfusion injury on microvascular reactivity and tissue metabolism in skeletal muscle, a Sprague-Dawley rat cremaster muscle was prepared as a tourniquet ischemia model and subjected to 2 hr ischemia followed by 1 hr reperfusion to simulate the timing of ischemia during microvascular surgery. The dose-response curve of arteriolar reactivity to norepinephrine, lipid peroxidation, and ultrastructure of capillaries was determined in both the control and postischemic reperfusion stages. Judging from the results, we summarize our observations as follows: (1) Postischemic reperfusion significantly increased arteriolar reactivity to norepinephrine, in which the EC50 for vasoconstriction decreased in all three orders of arterioles. These results suggest that reperfusion could have impaired the vasodilation control mechanism, possibly being endothelium dependent. (2) Lipid peroxidation increased sixfold in the reperfusion group, suggesting that oxygen free radicals have produced significant tissue damage under the created conditions. (3) Significant endothelial damage in the capillaries shown by electron microscope observation supports these studies, indicating that ischemia/reperfusion in clinically transplanted skeletal muscles could cause significant damage to the tissue microcirculation both physiologically and metabolically.
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335
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Chang YC, Wu JM, Lin SJ, Wu MH. Common atrium with Ebstein's anomaly in a neonate with Ellis-van Creveld syndrome. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI ZA ZHI [JOURNAL]. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI 1995; 36:50-2. [PMID: 7778447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A female newborn with characteristic multiple anomalies of Ellis-van Creveld syndrome is reported. Common atrium with Ebstein's malformation of the tricuspid valve was diagnosed by serial echocardiographic examinations. Such a combination of cardiac anomalies have not previously been reported in this syndrome.
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336
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Wang PJ, Young C, Liu HM, Chang YC, Shen YZ. Neurophysiologic studies and MRI in Pelizaeus-Merzbacher disease: comparison of classic and connatal forms. Pediatr Neurol 1995; 12:47-53. [PMID: 7748360 DOI: 10.1016/0887-8994(94)00124-k] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Four patients with the classic form and 1 patient with the connatal form of Pelizaeus-Merzbacher disease were studied with magnetic resonance imaging, electroencephalography, and multimodal evoked potentials, including brainstem auditory evoked potentials, somatosensory evoked potentials, and visual evoked potentials. Comparisons between these findings were made. It was determined that the neurophysiologic studies, particularly brainstem auditory evoked potentials, are of value in early diagnosis of Pelizaeus-Merzbacher disease; brainstem auditory evoked potentials with only normal wave I may be a relatively reliable clue suggesting the classic form of Pelizaeus-Merzbacher disease in patients with nystagmus and chronic progressive encephalopathy. Magnetic resonance imaging allows an accurate assessment of the degree of hypomyelination; however, the clinical severity of various forms of Pelizaeus-Merzbacher disease seemed to be independent of the age of onset and the amount of residual myelin. The following may be distinguishing features between the connatal and classic forms of Pelizaeus-Merzbacher disease: hypoplasia of the cerebellum and brainstem, and diffuse brain atrophy on magnetic resonance imaging; optic atrophy with abnormal visual evoked potential; seizure disorder with abnormal electroencephalography, and/or auditory nerve impairment with abnormal wave I of brainstem auditory evoked potentials in the early stage of the disease.
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337
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Liou HH, Yip PK, Chang YC, Liu HM. Allergic granulomatosis and angiitis (Churg-Strauss syndrome) presenting as prominent neurologic lesions and optic neuritis. J Rheumatol 1994; 21:2380-4. [PMID: 7699647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We describe a Chinese male patient with clinicopathologically definite Churg-Strauss syndrome. He had a clinical pattern of mononeuropathy multiplex and unusual optic neuritis, the latter probably being due to vasculitis related demyelination of the optic nerve. Magnetic resonance imaging of the brain revealed many clinically silent central nervous system lesions. He initially received steroid therapy, but an early cessation of treatment resulted in acute exacerbation. Later on, he was treated with combined prednisolone-cyclophosphamide therapy for 1 year. His ophthalmological and neurological symptoms responded well to such a regimen and disappeared within 6 months.
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338
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Chen HS, Wang TG, Chang YC, Yang YC, Shieh HR, Laiand JS, Lien IN. [Barium-pudding: a new medium for videofluoroscopic examination]. J Formos Med Assoc 1994; 93 Suppl 3:S156-60. [PMID: 7606174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The evaluation of swallowing function is crucial in the management of dysphagic patients. It includes clinical assessment and laboratory tests that consist of fiberoptic endoscopic examination of swallowing (FEES) and videofluoroscopic examination. The "modified barium swallow" has been regarded as the standard procedure of videofluoroscopic examination since its introduction in 1983. The technique enables the entire process of deglutition to be observed with the benefits of safety, easily performance, and information. However, pitfalls developed in patients with pseudobulbar paralysis. Discrepancy always occurs between barium meals and real food and the refusal of swallow and misswallowing to the airway in videofluoroscopic examination sometimes occurs because of the unsatisfactory taste of barium meal. All these things make the procedure impractical and inaccurate. We developed a barium sulfate pudding that is better tasting, similar to real food as a pudding, is adequate to visualise on videofluoroscopic examination, and has the ability to represent the patient's capacity to swallow solid food. We present a case of hypoxic encephalopathy where the patient was considered to be in danger of aspiration when swallowing any consistency of foods. Barium-pudding study showed the patient had the ability to eat solid food with safety. We removed her nasogastric tube following barium-pudding assessment and successfully restored her oral feeding function within 2 weeks. Barium-Pudding is a better medium of videofluoroscopic examination by which to evaluate the swallowing function of solid food than Barium paste in patient, who have disturbed swallowing.
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339
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Zhu B, Chang YC. Inversion asymmetry, hole mixing, and enhanced Pockels effect in quantum wells and superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:11932-11948. [PMID: 9975334 DOI: 10.1103/physrevb.50.11932] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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340
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Cancio AC, Chang YC. Quantum Monte Carlo calculations of phonon-assisted luminescence from polyexcitons in Si. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:11606-11617. [PMID: 9975293 DOI: 10.1103/physrevb.50.11606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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341
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Yan BS, Liao LY, Leou K, Chang YC, Syu WJ. Truncating the putative membrane association region circumvents the difficulty of expressing hepatitis C virus protein E1 in Escherichia coli. J Virol Methods 1994; 49:343-51. [PMID: 7532651 DOI: 10.1016/0166-0934(94)90149-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The putative E1 of hepatitis C virus (HCV) was expressed in Escherichia coli using a glutathione-S-transferase (GST) fusion protein system. The full length E1 protein is difficult to express. A series of E1 DNA fragments was generated and used for expression vector construction. Fusion proteins containing the E1 C-terminal region could not be expressed. When this region was truncated, the fusion proteins were synthesized to high levels. The possibility of this C-terminal region hampering the production of fusion protein was further explored. A construct with this segment directly fused to the C-terminus of GST indeed generated no detectable recombinant protein. According to the predicted structure of E1, this region may have membrane-associating properties. The expression results suggest a general approach to facilitate the production of viral membrane proteins in prokaryotes. Furthermore, these recombinant E1 proteins generated as antigens were used for Western blotting with sera from HCV-infected individuals. It was found that E1 is antigenic during HCV natural infection.
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342
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Jeng JS, Chung MY, Yip PK, Hwang BS, Chang YC. Extracranial carotid atherosclerosis and vascular risk factors in different types of ischemic stroke in Taiwan. Stroke 1994; 25:1989-93. [PMID: 8091442 DOI: 10.1161/01.str.25.10.1989] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND AND PURPOSE The clinical patterns of stroke and the angiographic distribution of cerebral atherosclerosis in Chinese people are different from those in whites. Studies relating carotid atherosclerosis and vascular risk factors to various types of stroke in Chinese people are lacking. METHODS Based on clinical information, we separated 367 stroke patients living in Taiwan into four subgroups: cortical infarction (CI), subcortical infarction (SCI), vertebrobasilar artery infarction (VBAI), and cardioembolic infarction (CEI). We assessed the extent and severity of extracranial carotid artery atherosclerosis in different types of ischemic stroke using duplex ultrasonography. Vascular risk factors and carotid atherosclerosis were then correlated with each subgroup of ischemic stroke. RESULTS Our data revealed that 32% of the CI subgroup, 3% of the SCI subgroup, 7% of the VBAI subgroup, and 21% of the CEI subgroup possessed severe carotid stenosis (> or = 50% stenosis or occlusion). The extent of atherosclerosis of extracranial carotid arteries, measured by plaque score, was also more severe in the CI subgroup than in the other subgroups. Diabetes mellitus was more frequent in the CI subgroup. Cardiomegaly and left ventricular hypertrophy were more commonly seen in the CEI subgroup. The VBAI subgroup was younger than the other subgroups. There were no differences in hypertension, prior stroke, alcohol intake, or serum levels of glucose, uric acid, hematocrit, lipids, and lipoproteins among the subgroups. CONCLUSIONS Of the Chinese patients living in Taiwan, the extent and severity of extracranial carotid artery atherosclerosis were more prominent in patients with CI than in patients with other types of ischemic stroke. In Chinese patients with CI, severe carotid stenosis is not uncommon; in Chinese patients with SCI, however, the frequency of carotid stenosis is quite low.
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343
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Zhang XW, Chen Y, Chang YC, Yang XH, Su GP. [Effects of vocalization and respiration and fiber connections on hyperstriatum ventrale pars caudale in Fringilla montifringilla]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1994; 46:451-7. [PMID: 7846544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In urethane-anesthetized Fringilla montifringilla, effects of electrically stimulating the hyperstriatum ventrale pars caudale (HVc) on vocalization and respiration were observed. Central connections of HVc were investigated by means of injecting CB-HRP into HVc. The results were as follows: (1) Electrical stimulation of HVc caused vocal response. (2) Long train electrical pulses stimulation of HVc elicited significant respiratory facilitating effects, that is, increase of respiratory rate and depth. (3) Short train stimulation administered in HVc during inspiratory phase terminated switching-off of inspiration, and during expiratory phases produced the prolongation of expiratory phase so to coordinate vocalization and then increasing the respiratory rate and depth. (4) CB-HRP traces revealed that HVc projected to robust nucleus of the archistriatum, and atea X of lobus parolfactorius. HVc received projections from medial nucleus magnocellularis of the anterior neostriatum, nucleus interfacialis of midneostriatum, telencephalic auditory nucleus-field L, nucleus uvaeformis of the thalamus, and locus ceruleus of the pons. These results showed that, besides vocal control, HVc may be involved in neural regulations of respiratory facilitation, the effect on respiration seeming specific. It is suggested that HVc may play an important role in coordinating singing and respiration.
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344
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Wang JK, Li YW, Chiu IS, Wu MH, Chang YC, Hung CR, Lue HC. Usefulness of magnetic resonance imaging in the assessment of venoatrial connections, atrial morphology, bronchial situs, and other anomalies in right atrial isomerism. Am J Cardiol 1994; 74:701-4. [PMID: 7942529 DOI: 10.1016/0002-9149(94)90313-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Multiple complex venous and intracardiac anomalies are frequently seen in patients with right atrial isomerism, and complete anatomic information may not always be obtained from combined echocardiography and angiography. Twenty patients with right atrial isomerism were prospectively studied with use of magnetic resonance imaging (MRI); satisfactory imaging was obtained in 18 patients, aged 6 days to 12 years (median 3 months). All patients had undergone echocardiography, cardiac catheterization, and angiocardiography. The purpose of this study was to assess the usefulness of MRI in the evaluation of venoatrial connections, atrial morphology, bronchial situs, and additional anomalies. Bilateral superior venae cavae were documented in 12 patients and anomalous hepatic venous drainage in 11. The pulmonary venous system was imaged in all 18 patients, of whom 12 had total anomalous pulmonary venous connection: 9 supracardiac, 2 infracardiac, and 1 mixed type. Some obstruction to pulmonary venous return was present in 9 of the 12 patients, and the site of obstruction was demonstrated by MRI in 6. Bilateral morphologic right atrial appendages were imaged in 7 patients. Bilateral morphologic right bronchi were identified in 17 patients, asplenia was confirmed in 17 of 18 patients by the absence of splenic tissue on imaging, and hiatal hernia was imaged in 4. Compared with angiography and echocardiography, MRI more clearly defined the pulmonary venous connections in 10 patients with pulmonary venous obstruction. Anomalous hepatic venous connections were better defined by MRI in 2. Therefore, MRI provided valuable supplementary information on the cardiovascular and visceral anomalies in these patients.
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345
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Li G, Chang YC. Electronic structures of As/Si(001) 2 x 1 and Sb/Si(001) 2 x 1 surfaces. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:8675-8680. [PMID: 9974887 DOI: 10.1103/physrevb.50.8675] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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346
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Arvanov VL, Liou HH, Chang YC, Chen RC, Peng FC, Ling KH, Tsai MC. Interactions of anticholinesterases with Achatina fulica acetylcholine responses and electrogenic sodium pump. Neuroscience 1994; 62:581-6. [PMID: 7830898 DOI: 10.1016/0306-4522(94)90390-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The dose-dependent effects of the anticholinesterases, neostigmine and mycotoxin territrem-B, were determined on: (i) Cl(-)-responses of voltage clamped Achatina fulica neurons to microperfused acetylcholine; (ii) the 4 K(+)-induced outward currents evoked by an electrogenic sodium pump in the same neuron; and (iii) acetylcholinesterase activity of Achatina fulica ganglionic homogenates. Both compounds at low doses potentiated the peak acetylcholine responses. However, they had different effects at higher (> 1 microM) doses in that neostigmine now antagonized acetylcholine responses, while territrem-B still produced a maximal potentiation. At all doses neostigmine produced a dose-dependent inhibition of acetylcholinesterase activity. The cholinolytic effect of high doses of neostigmine was associated with the inhibition of 4 K(+)-induced current in the same neuron, while territrem-B neither altered the K(+)-induced current nor antagonized acetylcholine responses. The cholinolytic effect of neostigmine was completely antagonized by the inhibition of electrogenic sodium pump by ouabain or by perfusion with K(+)-free solution. These results suggest that neostigmine at high concentrations inhibits the electrogenic sodium pump and that the cholinolytic effect of high doses of neostigmine is secondary to this action. Territrem-B, on the other hand, had no effect on the electrogenic sodium pump and had no effect on the neuronal membrane properties other than to inhibit acetylcholinesterase. Thus, territrem-B may be a useful tool for studying the interaction between acetylcholinesterase and acetylcholine receptors.
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Lian LM, Chang YC, Yang CC, Yang JC, Kao KP, Chung MY. Adult Fanconi syndrome with proximal muscle weakness and hypophosphatemic osteomalacia: report of a case. J Formos Med Assoc 1994; 93:709-14. [PMID: 7858457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
A 42-year-old female presented with progressive proximal muscle weakness, generalized hyperreflexia, marked bone pain, severe lumbago and knee arthralgia. Electromyographic study showed short-duration (5-10 msec), variable amplitude (200-2500 microV) polyphasic potentials. A muscle biopsy specimen revealed non-specific type II fiber atrophy. After a comprehensive laboratory work-up, adult Fanconi syndrome was diagnosed. The patient's symptoms, including bone pain and proximal muscle weakness, were relieved after a six-week supplement of tricalcium phosphate, vitamin D3 and sodium bicarbonate. The hyperreflexia also became less brisk.
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348
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Xing L, Chang YC. Nuclear spin-lattice relaxation induced by thermally fluctuating flux lines. PHYSICAL REVIEW LETTERS 1994; 73:488-491. [PMID: 10057459 DOI: 10.1103/physrevlett.73.488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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349
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Chang YC, Kwon-Chung KJ. Complementation of a capsule-deficient mutation of Cryptococcus neoformans restores its virulence. Mol Cell Biol 1994; 14:4912-9. [PMID: 8007987 PMCID: PMC358863 DOI: 10.1128/mcb.14.7.4912-4919.1994] [Citation(s) in RCA: 211] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Capsule formation plays a significant role in the pathogenicity of Cryptococcus neoformans. To study the molecular basis of capsule synthesis, the capsule-deficient phenotype of a mutant strain was complemented by transformation. A plasmid rescued from the resulting Cap+ transformant complemented a cap59 mutation which was mapped previously by classical recombination analysis. Gene deletion by homologous integration resulted in an acapsular phenotype, indicating that we have identified the CAP59 gene. The CAP59 gene was assigned to chromosome I by Southern blot analysis of contour-clamped homogeneous electric field gel electrophoresis-resolved chromosomes of C. neoformans var. neoformans. Sequence comparison of genomic and cDNA clones indicated the presence of six introns. CAP59 encoded a 1.9-kb transcript and a deduced protein of 458 amino acids. Analysis of the nucleotide sequence revealed little similarity to existing sequences in the data bank. When the capsule-deficient phenotype was complemented, the originally avirulent C. neoformans strain became virulent for mice. In addition, the acapsular strain created by gene deletion of CAP59 lost its virulence. This work demonstrates the molecular basis for capsule-related virulence and that the CAP59 gene is required for capsule formation.
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Wen G, Chang YC. Theory of absorption spectra for above-barrier excitons in semiconductor superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:16585-16592. [PMID: 10010815 DOI: 10.1103/physrevb.49.16585] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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