1001
|
Cheng L, Jaeger R. Acrylonitrile solubility in human blood: Determination of the Ostwald partition coefficient. J Appl Toxicol 1982. [DOI: 10.1002/jat.2550020105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
1002
|
Cheng LY, Tam JW. Chemical modification of hemoglobin in intact whole cells: morphological studies by scanning electron microscope. THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1982; 14:461-5. [PMID: 7106347 DOI: 10.1016/0020-711x(82)90113-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
1. Whole blood was incubated in physiological conditions with a variety of modifiers capable of modifying hemoglobin. Some of these compounds have been considered as therapeutic agents for certain hemoglobinopathies such as sickle-cell disease. 2. The extent of modification on hemoglobin was estimated by electrophoresis and the red-cell morphology by scanning electron microscope. 3. Results indicated that carbamyl phosphate, aspirin and glutaryl-salicylamide had no observable effect, whereas cross-linkers in general produced drastic changes in red-cell morphology. 4. Dibromoaspirin, a very effective acetylating agent, produced abnormalities even in concentrations as low as 1 mM.
Collapse
|
1003
|
Sacktor B, Cheng L, Liang CT. In vivo and in vitro effects of vitamin D3 [1,25-(OH)2D3] on the uptake of phosphate by isolated chick kidney cells. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1982; 151:87-95. [PMID: 6897487 DOI: 10.1007/978-1-4684-4259-5_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
1004
|
Ulich TR, Cheng L, Gitnick GL, Thorne CA, Lewin KJ. Chronic active hepatitis of hepatitis B and non-A, non-B etiology. Am J Surg Pathol 1982; 6:33-9. [PMID: 6805344 DOI: 10.1097/00000478-198201000-00003] [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: 01/22/2023]
Abstract
Sixty-six consecutive liver biopsies demonstrating chronic hepatitis (CAH) were stained for the presence of HBsAg using the three-step peroxidaseantiperoxidase technique. Only cases of CAH thought to be attributable to either hepatitis B or non-A, non-B hepatitis were included in this series. Twenty-three of 30 biopsies taken from 24 patients with HBsAg-positive serum stained positively. None of the HBsAg sero-negative cases stained postively. Hepatocytes staining positively for HBsAg were generally few in number and randomly distributed within the liver lobules. Three cases of membranous staining were noted. After grading both the degree of inflammatory activity and the amount of HBsAg staining, we found that a statistically significant inverse relationship exists. The biopsies of six of the GBsAg sero-positive patients who had received steroid therapy for their liver disease did not stain differently from the biopsies of the remaining 18 HGsAg sero-positive patients. Stains for HBsAg may help in distinguishing acute hepatitis B (HB) superimposed on preexisting liver disease from hepatitis B-CAH (CAHB). This distinction may be possible because tissue staining almost always is negative in acute HB, whereas it often is focally positive in CAHB. This application of immunoperoxidase may be especially useful in patients who are drug addicts.
Collapse
|
1005
|
Sacktor B, Cheng L. Sodium gradient-dependent phosphate transport in renal brush border membrane vesicles. Effect of an intravesicular greater than extravesicular proton gradient. J Biol Chem 1981; 256:8080-4. [PMID: 7263641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
A H+ gradient (intravesicular greater than extravesicular), in the absence of a Na+ gradient (extravesicular greater than intravesicular) stimulated phosphate uptake by renal brush border membrane vesicles and provided the driving force to effect the transient accumulation of phosphate against its concentration gradient. The H+ gradient-dependent uptake of phosphate had an absolute requirement for Na+. The rates of uptake and peak accumulation were functions of the delta pH and the concentration of H+ in the intravesicular medium. The H+ gradient-energized Na+-phosphate cotransport system was not affected by valinomycin- or carbonyl cyanide p-fluoromethoxyphenylhydrazone-induced ion diffusion potentials. Therefore, it was independent of the membrane potential, i.e. an electroneutral process. Amiloride, which inhibited the H+-Na+ exchange reaction and prevented the efflux of H+ from the intravesicular medium, enhanced the uptake of phosphate. A model is proposed by which the H+ gradient mediates the uphill transport of phosphate. It is suggested that a similar process may operate in more physiologically intact preparations and may provide one mechanism by which acid-base balance regulates renal phosphate transport.
Collapse
|
1006
|
Sacktor B, Cheng L. Sodium gradient-dependent phosphate transport in renal brush border membrane vesicles. Effect of an intravesicular greater than extravesicular proton gradient. J Biol Chem 1981. [DOI: 10.1016/s0021-9258(18)43391-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
1007
|
Iyengar BS, Lin HJ, Cheng L, Remers WA, Bradner WT. Development of new mitomycin C and porfiromycin analogues. J Med Chem 1981; 24:975-81. [PMID: 7328599 DOI: 10.1021/jm00140a012] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
New mitomycin C and porfiromycin analogues were prepared by treating mitomycin A and N-methylmitomycin A with a variety of amines, including aziridines, allylamines, propargylamines, chloroalkylamines, hydroxyalkylamines, glycine derivatives, aralkylamines, and heterocyclic amines. All analogues were evaluated against P-388 murine leukemia and selected ones were examined for their leukopenic properties. Certain analogues were found to be superior to mitomycin C in potency, efficacy, and therapeutic ratio in the P-388 assay. The most active substituents at the mitosane 7 position included aziridine, 2-methylaziridine, propargylamine, furfurylamine, methyl glycinate, and 3-aminopyridine. Mitomycin A and the 7-aziridino, 7-(2-methylaziridino), and 3-aminopyridine analogues were less leukopenic than mitomycin C. Certain other analogues, including propargylamino and methyl glycinate, were highly leukopenic. The three compounds tested against B-16 melanoma in mice were significantly more effective than mitomycin C in this assay. Previously established structure--activity relationships were found inadequate to account for all of the new data.
Collapse
|
1008
|
Cheng L, Kellogg EW, Packer L. Photoinactivation of catalase. Photochem Photobiol 1981; 34:125-9. [PMID: 7291325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
1009
|
Sacktor B, Rosenbloom IL, Liang CT, Cheng L. Sodium gradient- and sodium plus potassium gradient-dependent L-glutamate uptake in renal basolateral membrane vesicles. J Membr Biol 1981; 60:63-71. [PMID: 7241582 DOI: 10.1007/bf01870833] [Citation(s) in RCA: 149] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A membrane preparation enriched in the basolateral segment of the plasma membrane was isolated from the rat renal cortex by a procedure that included separation of particulates on a self-generating Percoll gradient. The uptake of L-glutamate by the basolateral membrane vesicles was studied. A Na+ gradient (Na+]o greater than [Na+]i) stimulated the uptake of L-glutamate and provided the driving force for the uphill transport of the acidic amino acid, suggesting a Na+-L-glutamate cotransport system in the basolateral membrane. A K+ gradient ([K+]i greater than [K+]o) increased the uptake additionally. This effect was specific for K+(Rb+). The action of the K+ gradient in enhancing the uptake of L-glutamate had an absolute requirement for Na+. In the presence of Na+, but in the absence of a Na+ gradient. i.e., [Na+]o = [Na+]i, the K+ gradient also energized the concentrative uptake of L-glutamate. This effect of the K+ gradient was not attributable to an alteration in membrane potential. The finding of a concentrative uptake system for L-glutamate energized by both Na+ ([Na+]o greater than [Na+]i and K+ ([K+]o) gradients in the basolateral membrane, combined with previous reports of an ion gradient-dependent uphill transport system for this amino acid in the brush border membrane, suggests a mechanism by which L-glutamate is accumulated intracellularly in the renal proximal tubule to extraordinarily high concentrations.
Collapse
|
1010
|
Cheng L, Cross WG. A drop impact sampler. ENVIRONMENTAL SCIENCE & TECHNOLOGY 1981; 15:459-463. [PMID: 22248414 DOI: 10.1021/es00086a011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
|
1011
|
Cheng L, Sacktor B. Sodium gradient-dependent phosphate transport in renal brush border membrane vesicles. J Biol Chem 1981; 256:1556-64. [PMID: 7462213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
|
1012
|
Cheng L, Sacktor B. Sodium gradient-dependent phosphate transport in renal brush border membrane vesicles. J Biol Chem 1981. [DOI: 10.1016/s0021-9258(19)69840-6] [Citation(s) in RCA: 108] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
1013
|
Cheng L, Liang CT, Sacktor B. In vitro effects of parathyroid hormone on kidney cortical slices: cAMP responses and concomitant inhibition of the Na+ gradient-dependent uptake of phosphate by brush border membrane vesicles isolated from the renal slices. ENDOCRINE RESEARCH COMMUNICATIONS 1981; 8:97-110. [PMID: 6271524 DOI: 10.1080/07435808109049841] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Mouse renal cortical slices were incubated with parathyroid hormone (30 U/ml) for 2 min. Brush border membrane vesicles isolated from the treated slices had a decreased Na+ gradient-dependent uptake of phosphate. Concomitantly, the hormone elicited the activation of adenylate cyclase, the increase in tissue level of cAMP, and the enhancement of cAMP-dependent protein kinase.
Collapse
|
1014
|
Zhou L, Zhou LW, Xu RK, Cheng LY, Chen YZ, Zhao MS. [The changes of pain-producing substances under acupuncture anesthesia (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1980; 2:263-7. [PMID: 6458378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
1015
|
Zhang XZ, Yu Y, Chou LW, Peng JY, Cui SY, Cheng LY, Chen YZ, Zhou S. [Variation of sympathetic activity and prostaglandin E level under acupuncture anesthesia (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1980; 2:259-62. [PMID: 6458377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
1016
|
Lipsky JJ, Cheng L, Sacktor B, Lietman PS. Gentamicin uptake by renal tubule brush border membrane vesicles. J Pharmacol Exp Ther 1980; 215:390-3. [PMID: 7441503] [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
The uptake of [3H]gentamicin by isolated rabbit renal proximal tubule brush border membrane vesicles was studied. Uptake was biphasic, with an initial rapid uptake followed by a prolonged slower phase. Approximately half of the total uptake represented binding; the other half represented transport into an intravesicular space. Scatchard analysis indicated the presence of two binding sites, differing in affinity (8 X 10(3) and 0.9 X 10(3) M-1) and number of sites per milligram of protein (1.2 and 3.7 nmol/mg of membrane protein, respectively). [3H]Gentamicin uptake was not affected by a Na+ electrochemical gradient, a valinomycin-generated (inside negative) K+ diffusion potential or the presence of phlorizin and D- of L-glucose. These findings indicate that the mechanism of uptake of the aminoglycoside was distinct from those of sugar and amino acids. Uptake of [3H]gentamicin was inhibited and reversed by the unlabeled aminoglycoside and by spermine. Spermine, on a molar basis, was as effective as gentamicin. These results suggest that gentamicin and spermine may have a common polyamine transport system and demonstrate the feasibility of further investigations to prevent aminoglycoside accumulation and possibly subsequent nephrotoxicity.
Collapse
|
1017
|
Cheng L. Pheochromocytoma in rats: incidence, etiology, morphology and functional activity. JOURNAL OF ENVIRONMENTAL PATHOLOGY AND TOXICOLOGY 1980; 4:219-28. [PMID: 7217847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The incidence of spontaneous pheochromocytoma in rats varies with the strain, sex, age and diet of the animals. Treatment with growth hormone, estrogens, or radiation is associated with the occurrence of pheochromocytoma in the rat. Histological evidence and transplantation studies indicate that pheochromocytoma in rats possesses a low grade of malignancy. A transplantable radiation-induced pheochromocytoma model has been shown to be functionally active.
Collapse
|
1018
|
Cheng LY, Cristoveanu J. The disabilities of chronic schizophrenia. Br J Psychiatry 1980; 137:197. [PMID: 7426852 DOI: 10.1192/bjp.137.2.197c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
1019
|
Cheng L. Urinary tract calculi in man and laboratory animals: incidence, composition, and etiology. JOURNAL OF ENVIRONMENTAL PATHOLOGY AND TOXICOLOGY 1980; 4:317-49. [PMID: 7441117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Calculi in the urinary tract is a disease which afflicts not only man, but also experimental animals. The incidence of human stone disease varies widely according to the geographical area. With the advent of sophisticated physicochemical techniques, the elucidation of structure and the quantification of mineral components of urinary calculi have been greatly facilitated. In addition to calcium oxalate and calcium phosphate, more than ten other minerals and a large number of trace elements have been identified to date. Matrix material consists of such macro-molecules as proteins and mucopolysaccharides. The etiology of urinary calculi is varied; diet, drugs, chemicals, bladder implants, infections, metabolic derangements, and environmental influences are some of the factors that can contribute to the pathogenesis of stones. The literature findings reflect the complexity of urolithiasis as a clinicopathological problem.
Collapse
|
1020
|
Birch MC, Cheng L, Treherne JE. Distribution and environmental synchronization of the marine insect, Halobates robustus, in the Galapagos islands. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES B, BIOLOGICAL SCIENCES 1979; 206:33-52. [PMID: 42069 DOI: 10.1098/rspb.1979.0090] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The following three aspects of the biology of the marine insect Halobates robustus were studied, during a two week observation period, at several sites in the Galapagos Islands: distribution, aggregation behaviour and rhythmicity of locomotory activity. H. robustus occurred in highest numbers on the water surface at shores fringed with mangroves. The aggregations of H. robustus varied according to their location and density. Copulating adults formed dense, floating aggregations, which tended to be close to rocks or mangroves. Late instar nymphs were less aggregated and, in lagoons (where there was some shelter from direct tidal forces), were furthest from the shore. In two types of habitat (mangrove-fringed, sandy shores and rocky shores) the aggregations of H. robustus showed a pronounced ability to maintain a floating station in relation to the surrounding environment, irrespective of tidal movements (in one case at 34 m from the nearest fixed objects). Evidence of the ability of the aggregations to maintain station on the water surface was also obtained by comparing the movements of H. robustus with those of floating polystyrene particles, which move passively with wind and tide. Laboratory observations and experiments indicated no clear periodicity in locomotory movements throughout a 24 h period. However, the frequency of encounters between individuals showed two daily peaks, post-dawn and pre-dusk, with fewer encounters during the day and only occasional encounters during the night. By shifting the light-dark cycle it was demonstrated that the daily bimodal rhythm of encounters is triggered by dawn and, since it is not maintained in constant light or dark, an 'hour-glass' mechanism is suggested. The contributions of single adults, of copulating pairs and of immature stages to the overall pattern of activity were also determined. Immature stages did not affect the overall rate of encounters significantly and the interactions between single and copulating pairs of adults appear to have been responsible for the bimodal pattern.
Collapse
|
1021
|
Tam JW, Cheng LY. Chemical cross-linking of hemoglobin H. A possible approach to introduce cooperativity and modification of its oxygen transport properties. BIOCHIMICA ET BIOPHYSICA ACTA 1979; 580:75-84. [PMID: 121058 DOI: 10.1016/0005-2795(79)90198-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Native and reconstituted hemoglobin H molecules were cross-linked with glutaraldehyde at pH values close to the physiological. The Schiff base adducts were analysed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis before and after reduction with sodium borohydride. The major component had a molecular weight of about 31 000 which corresponded to the dimeric species of the beta subunit. In contrast to the native protein, which has very high oxygen affinity and no heme-heme interaction or 2,3-diphosphoglyceric acid effect, the modified hemoglobin H molecules showed cooperative oxygen binding, decreased oxygen affinity and a noticeable 2,3-diphosphoglyceric acid effect.
Collapse
|
1022
|
Hoon RA, Benedetti D, Cheng L, Hedges N, Piaggio K. Who does what? THE AUSTRALIAN NURSES' JOURNAL. ROYAL AUSTRALIAN NURSING FEDERATION 1979; V9:49-51. [PMID: 258139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
1023
|
|
1024
|
Hoon RA, Benedetti D, Cheng L, Hedges N, Piaggio K. Who does what? Role definition in a psychiatric hospital. Med J Aust 1978; 2:526-31. [PMID: 732643 DOI: 10.5694/j.1326-5377.1978.tb131693.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This is a report of an interdisciplinary workshop which was held to define the roles of different disciplines within a psychiatric unit. While the report emphasizes the medicolegal responsibility of the psychiatrists, we found, in a review of the knowledge background of the several disciplines, potentials for a further utilization of the knowledge which is acquired during their training. Meeting the patient's needs is the prime factor in determining the roles of the disciplines. The needs of the patient have expanded. Each discipline has both an exclusive role and an inclusive role. One important result of the workshop was the warmth and the esprit de corps that was felt afterwards.
Collapse
|
1025
|
Abstract
In this presentation of two cases it is suggested that many Münchausen syndrome patients present with psychiatric symptoms. This syndrome, however, should be differentiated from other clinical psychiatric conditions.
Collapse
|
1026
|
|
1027
|
Bull KR, Murton RK, Osborn D, Ward P, Cheng L. High levels of cadmium in Atlantic seabirds and sea-skaters. Nature 1977; 269:507-9. [PMID: 909596 DOI: 10.1038/269507a0] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
1028
|
Cheng L, Remers WA. Comparative stereochemistry in the aziridine ring openings of N-methylmitomycin A and 7-methoxy-1,2-(N-methylaziridino)mitosene. J Med Chem 1977; 20:767-70. [PMID: 874953 DOI: 10.1021/jm00216a006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A useful method was found for the conversion of mitomycin C into N-methylmitomycin A. The latter compound gave only two products on acid hydrolysis, the cis- and trans-1-hydroxy-7-methoxy-2-methylaminomitosenes. This selectivity allowed the cis--trans ratio to be quantitatively determined as 4:1. Such a predominance of the cis isomer is unexpected in view of the trans stereochemistry obtained in the opening of simple aziridines. In order to determine if the 9a-methoxy group of mitomycins controlled the direction of aziridine ring opening 7-methoxy-1,2-(N-methylaziridino)mitosene, which lacks this substituent, was prepared and hydrolyzed in acid. It gave the same two products in a 3:1 cis-trans ratio. In the induction of lambda-bacteriophage in Escherichia coli cis-1-hydroxy-7-methoxy-2-methylaminomitosene was more active than the corresponding trans isomer, but both of these compounds were less active than the aziridinomitosene or the mitomycins. Mitomycin A, mitomycin C, and N-methylmitomycin A were active against P388 leukemia in mice.
Collapse
|
1029
|
Rando RR, Relyea N, Cheng L. Mechanism of the irreversible inhibition of aspartate aminotransferase by the bacterial toxin L-2-amino-4-methoxy-trans-3-butenoic acid. J Biol Chem 1976; 251:3306-12. [PMID: 6451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The naturally occurring toxin L-2-amino-4-methoxy-trans-3-butenoic (AMB) acid irreversibly inhibits pyridoxal phosphate-linked aspartate aminotransferase. The inhibitor is a substrate for the enzyme, and as such is converted into a highly reactive intermediate which chemically reacts with an active site residue, thus irreversibly inactivating the enzyme. Enzymological and model studies on AMB are presented which enable one to determine the precise mechanism of action of this toxin. The mechanism involves Schiff base formation between the enzyme and toxin followed by alpha-C--H bond cleavage and aldimine isomerization to generate a bifunctional Michael acceptor. This molecule alkylates an active site residue by an addition and elimination route.
Collapse
|
1030
|
Cheng L. The credo of my professionalism. THE PHILIPPINE JOURNAL OF NURSING 1976; 45:19-21. [PMID: 1050753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
1031
|
Lee RF, Polhemus JT, Cheng L. Lipids of the water-strider Gerris remigis Say (Heteroptera: Gerridae). Seasonal and developmental variations. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1975; 51:451-6. [PMID: 1149432 DOI: 10.1016/0305-0491(75)90037-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
1032
|
Abstract
The problems of foreign residents in psychiatry in Canada are examined under the general headings of communication difficulties, cultural differences, personal and professional problems. It is emphasized that each resident presents his unique combination of problems and possesses positive values of his culture-shift which are potentially contributory to better empathy with patients. About 25 percent to 50 percent of residents in psychiatry in Canada are foreign medical graduates.
Collapse
|
1033
|
|
1034
|
Cheng L. Formation of airborne-respirable dust at belt conveyor transfer points. AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL 1973; 34:540-6. [PMID: 4770676 DOI: 10.1080/0002889738506895] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
1035
|
Tomb TF, Cheng L, Stein RL. Suppression and collection of respirable coal dust using water and steam. Ann N Y Acad Sci 1972; 200:724-36. [PMID: 4513341 DOI: 10.1111/j.1749-6632.1972.tb40234.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
1036
|
Cheng L, Tung SK, Soo SL. Electrical Measurement of Flow Rate of Pulverized Coal Suspension. ACTA ACUST UNITED AC 1970. [DOI: 10.1115/1.3445325] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Electrostatic probes for indicating instantaneous flow rate of pulverized coal suspension in a pipe were devised and tested. Experiments were performed on flow systems consisting of 2 and 5-in-ID pipes with mass flow ratios up to 0.66 lb of coal/lb of air at up to 115 fps air velocity. Calibrations were made with a differential isokinetic sampling technique. With accurate control of probe potential, consistent indication of electrostatic ball probes (1/4 to 1/2-in. dia) was at the 10−7 amp level and at 10−8 amp level with cylindrical probes (0.2-in. ID). Accuracy within 1 percent was demonstrated to be feasible. Since the probe output is an electrical signal, this device makes integrated control system including the coal line feasible. Further, instantaneous and accurate fuel adjustment into furnaces facilitates air-pollution control.
Collapse
|
1037
|
Karpas CM, Dago C, Oppenheim A, Cheng L. Significance of circulating megakaryocytes in the peripheral blood of patients with cancer. Acta Cytol 1969; 13:142-8. [PMID: 5253724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
1038
|
Cheng LY, McKinley-McKee JS, Greenwood CT, Hourston DJ. II. The dissociation of the alcohol dehydrogenases. Biochem Biophys Res Commun 1968; 31:761-7. [PMID: 4298992 DOI: 10.1016/0006-291x(68)90627-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
1039
|
Cheng LY, McKinley-McKee JS. I. Reversible inactivation of liver and yeast alcohol dehydrogenase. Biochem Biophys Res Commun 1968; 31:755-60. [PMID: 5665869 DOI: 10.1016/0006-291x(68)90626-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|