2401
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Huang J, Kato K, Shibata E, Sugimura K, Hisanaga N, Ono Y, Takeuchi Y. Effects of chronic n-hexane exposure on nervous system-specific and muscle-specific proteins. Arch Toxicol 1989; 63:381-5. [PMID: 2818202 DOI: 10.1007/bf00303127] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Two kinds of nervous system-specific and muscle-specific proteins, enolase and S-100 protein, were quantitatively determined in peripheral nerves and skeletal muscles of rats chronically exposed to a neurotoxic solvent - n-hexane. Three groups of animals were exposed to n-hexane vapor at three different solvent concentrations (500 ppm, 1200 ppm, 3000 ppm) for 12 h/day, 7 days/week for 16 weeks. The body weight gain and motor nerve conduction velocity (MCV) in exposure groups show progressively concentration-dependent decreases compared to control values. Histopathological examination also demonstrates the degeneration of peripheral nerves in 3000 ppm- and 1200 ppm-exposed rats. The significant decrease in the amount of S-100 protein in peripheral nerves was observed not only in the high level exposure groups (3000 ppm and 1200 ppm), but also in the lowest level group (500 ppm), although the MCV and morphological examination remained unchanged at this level. In addition, the muscle-specific S-100 protein in 3000 ppm exposed rats' soleus also displayed a significant reduction. In contrast to this, however, enolase isozymes were not significantly changed by either dosage level in both nervous tissue and skeletal muscle. The experiment suggests that beta- and alpha-S-100 proteins which are specifically localized in nervous system and muscles, respectively, are more vulnerable than enolase isozymes under treatment with n-hexane, and may possibly serve as a specific indicator to evaluate the neurotoxic effects. Further research would be worthwhile to elucidate the role of the specific S-100 protein in evaluating the neurologic damage induced by various industrial chemicals.
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2402
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Huang J, Meyer M, Pontikis V. Is pipe diffusion in metals vacancy controlled? A molecular dynamics study of an edge dislocation in copper. PHYSICAL REVIEW LETTERS 1989; 63:628-631. [PMID: 10041131 DOI: 10.1103/physrevlett.63.628] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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2403
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Huang J, Kumar P. Photon-counting statistics of multimode squeezed light. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 40:1670-1673. [PMID: 9902310 DOI: 10.1103/physreva.40.1670] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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2404
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Rasing T, Huang J, Lewis A, Stehlin T, Shen YR. In situ determination of induced dipole moments of pure and membrane-bound retinal chromophores. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 40:1684-1687. [PMID: 9902314 DOI: 10.1103/physreva.40.1684] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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2405
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Huang J, Zhang JM, Lezama A, Mossberg TW. Excess dephasing in photon-echo experiments arising from excitation-induced electronic level shifts. PHYSICAL REVIEW LETTERS 1989; 63:78-81. [PMID: 10040437 DOI: 10.1103/physrevlett.63.78] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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2406
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Huang J, Li V. A meso-mechanical model of the tensile behaviour of concrete. part I: modelling of the pre-peak stress-strain relation. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0010-4361(89)90661-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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2407
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Huang J, Li V. A meso-mechanical model of the tensile behaviour of concrete. part II: modelling of post-peak tension softening behaviour. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0010-4361(89)90662-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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2408
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Shao BR, Huang ZS, Shi XH, Zhan CQ, Meng F, Ye XY, Huang J, Ha SH. Antimalarial and toxic effect of triple combination of pyronaridine, sulfadoxine and pyrimethamine. THE SOUTHEAST ASIAN JOURNAL OF TROPICAL MEDICINE AND PUBLIC HEALTH 1989; 20:257-63. [PMID: 2692191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The triple combination of pyronaridine, sulfadoxine and pyrimethamine which has been proven to be efficient in delaying emergence of drug resistance of rodent malarial parasites was further studied for potential application to malaria control. The antimalarial effect of the triple combination on Plasmodium berghei ANKA-infected mice and the toxic effects in mice and rats were additive. A single dose of pyronaridine 500 mg in combination with sulfadoxine, 1000 or 1500 mg, and pyrimethamine, 50 or 75 mg, given to 72 acute falciparum malaria patients resulted in a 100% cure rate with nil or mild side effects, and no recrudescence of asexual parasite over 4-week follow-up. Preliminary experiments on the drug effect on sporogony showed that the drug combination at the dose used could not completely interrupt the sporozoite formation although many retarded oocysts were found.
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2409
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Huang J, Roheim PS, Sloop CH, Wong L. A sensitive, inexpensive method for determining minute quantities of lipase activity. Anal Biochem 1989; 179:413-7. [PMID: 2774190 DOI: 10.1016/0003-2697(89)90154-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We describe a sensitive and reproducible lipase assay based on the binding of 63Ni to fatty acid. This method can detect down to 1 nmol of fatty acid per milliliter of solution. It has been adapted for measuring low concentrations of lipoprotein lipase and hepatic triacylglycerol lipase. Furthermore, in the presence of tritiated triolein, the method is insensitive to radiolabel interference, even when the fatty acid is labeled.
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2410
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Huang J, Liu GK, Cone RL. Resonant enhancement of direct two-photon absorption in Tb3+:LiYF4. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:6348-6354. [PMID: 9947269 DOI: 10.1103/physrevb.39.6348] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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2411
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You X, Chen J, Xu Z, Huang J. Structure of hexakis(isopropylammonium) diformyloctamolybdate. Acta Crystallogr C 1989. [DOI: 10.1107/s0108270188010984] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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2412
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Jackson L, Huang J, Richards K, Chen H. AR, ARMA, and AR-in-noise modeling by fitting windowed correlation data. ACTA ACUST UNITED AC 1989. [DOI: 10.1109/29.35404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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2413
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Ohya N, Takase K, Huang J, Toga H, Sakurai S, Fukunaga T. High-frequency ventilation by bilateral phrenic nerve stimulation in dogs. Respiration 1989; 56:167-72. [PMID: 2635346 DOI: 10.1159/000195797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We succeeded in achieving good gas exchange by oscillatory phrenic nerve stimulation (PNS) in dogs. In 7 out of 14 dogs, adequate gas exchange was attained by PNS at 3, 4 and 5 pulses per sec (pps). VE increased with stimulation frequency up to 4 or 5 pps, but decreased above 6 pps. We also applied sinusoidal oscillation using a piston pump at the trachea in the same dogs to analyze the mechanical properties of the respiratory system. The V/P ratio, oscillatory volume divided by driving pressure, decreased markedly at 6 Hz while the pleural pressure remained constant up to 10 Hz. These facts indicate that the fall in VE is due to mechanical properties of the airway and lung, and not due to failure of the ventilatory pump system. We conclude that frequencies of 3-5 pps in high-frequency ventilation are optimal for maintaining effective gas transport when the diaphragma is used as the oscillatory generator.
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2414
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Ohya N, Huang J, Fukunaga T, Toga H. Mouth pressure curve on abrupt interruption of airflow during forced expiration. J Appl Physiol (1985) 1989; 66:509-17. [PMID: 2917955 DOI: 10.1152/jappl.1989.66.1.509] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
An attempt was made to investigate how the mouth pressure curve represents the process of air flowing into the collapsed segment downstream to the choke point when the airflow is abruptly interrupted at the mouth during forced expiration. Immediately after the interruption of airflow, the mouth pressure suddenly increased (phase 1), followed by a slower rise in pressure (phase 2) within approximately 100 ms until the pressure reached the alveolar pressure. The pleural and alveolar pressures remained constant during this process. The first phase of the abrupt rise represented the pressure induced by the instantaneous interruption of the airflow itself. Analysis of the supramaximal flow (Vsupramax) observed after resumption of the airflow suggested that the choke point remained constant during the second phase of the mouth pressure after interruption of maximal flow (Vmax). From these results, examination of the second phase of the mouth pressure curve may provide useful information about the downstream segment of the airway.
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2415
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Huang J, Turcotte DL. Fractal mapping of digitized images: Application to the topography of Arizona and comparisons with synthetic images. ACTA ACUST UNITED AC 1989. [DOI: 10.1029/jb094ib06p07491] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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2416
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Liu GK, Huang J, Cone RL, Jacquier B. Spectral hole burning, Zeeman effect, and hyperfine structure for Tb3+:LiYF4. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:11061-11067. [PMID: 9945978 DOI: 10.1103/physrevb.38.11061] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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2417
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Dial EJ, Huang J, O'Neil RG, Hills BA, Lichtenberger LM. Surface hydrophobicity and water transport of the toad urinary bladder: effects of vasopressin. J Membr Biol 1988; 106:119-22. [PMID: 3147334 DOI: 10.1007/bf01871393] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The present study investigated whether the hydrophobic properties (wettability) of the luminal surface of the toad urinary bladder might play a role in modulating water transport across this epithelium. In the absence of vasopressin (ADH), water transport across the tissue was low, while luminal surface hydrophobicity (water contact angle) was relatively high. Following stimulation by ADH, water transport increased and surface hydrophobicity decreased. The addition of indomethacin to inhibit ADH-induced prostaglandin synthesis did not reduce these actions of ADH. In an attempt to alter water transport in this tissue, a liposomal suspension of surface-active phospholipids was administered to the luminal surface. This addition had no detectable influence on the low basal rates of water transport, but blocked the ADH-induced stimulation of water transport. We suggest that surface-active phospholipids on the toad bladder luminal membrane may contribute to the hydrophobic characteristics of this tissue. ADH may act to decrease surface hydrophobicity, facilitating the movement of water molecules across an otherwise impermeable epithelium. This surface alteration may be associated with the appearance of water channels in the apical membrane.
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2418
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Huang J, Goltz D, Smith F. A microwave dissolution technique for the determination of arsenic in soils. Talanta 1988; 35:907-8. [DOI: 10.1016/0039-9140(88)80211-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/1988] [Accepted: 08/04/1988] [Indexed: 11/25/2022]
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2419
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Abstract
We identified a Mg2+ dependent 5' exo-ribonuclease and an RNA ligase in cell-free extracts of Trypanosome brucei. The exo-ribonuclease in S100 or nuclear extracts, removes about 20 nts from the 5' end of SP6 derived capped as well as uncapped RNA and then stops. In contrast to the activity of the exo-ribonuclease on capped SP6 mini-exon transcripts, the exonuclease cannot degrade trypanosome-derived mini-exon transcripts or the mini-exon located at hsp 70 mRNAs. We therefore assume that the four secondary base modifications adjacent to the mini-exon cap, generated in vivo, confer resistance to the exo-ribonuclease. After exonuclease shortening of SP6 transcripts, an RNA ligase catalizes intramolecular ligation, generating a 3'-5' phosphodiester bond in a Mg2+ and ATP dependent reaction.
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2420
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Huang J. [Progression of coronary artery disease after coronary artery bypass graft surgery]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1988; 16:279-82, 317. [PMID: 3266142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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2421
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Jiang WP, Wang KP, Huang J. [Electrophysiologic studies on supraventricular tachycardias with wide QRS]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1988; 16:209-13, 253-4. [PMID: 3229331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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2422
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Mortin MA, Kim WJ, Huang J. Antagonistic interactions between alleles of the RpII215 locus in Drosophila melanogaster. Genetics 1988; 119:863-73. [PMID: 3137121 PMCID: PMC1203470 DOI: 10.1093/genetics/119.4.863] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The RpII215 locus encodes the large subunit of RNA polymerase II (polII). Three of 22 RpII215 alleles cause a synergistic enhancement of the mutant phenotype elicited by mutations in the Ultrabithorax (Ubx) locus. We have recovered and analyzed three new mutations that suppress this enhancement. All three mutations map to the RpII215 locus. In addition to suppressing the Ubx enhancement of other RpII215 alleles, two of the new mutations, JH1 and WJK2, themselves enhance Ubx. RpII215 alleles can be placed into three classes based on their ability to enhance Ubx. Class I alleles, including Ubl, C4, C11, JH1, and WJK2, enhance Ubx when heterozygous with class II alleles, which include wild-type RpII215. Class III alleles, which include amorphic alleles, do not enhance Ubx. The third new mutation, WJK1, is a conditional amorphic allele, which behaves like a class III allele at 29 degrees but like a class II allele at 19 degrees. Another mutant phenotype is caused by certain RpII215 alleles, including all class I alleles. This phenotype is a synergistic enhancement of a mutant phenotype elicited by mutations at the Delta (Dl) locus. Unlike the enhancement of Ubx, the enhancement of Dl is not dependent upon antagonistic interactions between different classes of RpII215 alleles.
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2423
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Ralph D, Huang J, Van der Ploeg LH. Physical identification of branched intron side-products of splicing in Trypanosoma brucei. EMBO J 1988; 7:2539-45. [PMID: 3191913 PMCID: PMC457125 DOI: 10.1002/j.1460-2075.1988.tb03102.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Every mRNA in trypanosomes consists of two exons, a common 5' capped mini-exon or spliced leader and a coding-exon. All evidence suggests that the exons are joined by trans-splicing of two individual precursor RNAs, the mini-exon donor RNA or spliced leader precursor RNA (medRNA) and the pre-mRNA. We studied intermediates of the splicing reaction using denaturing two-dimensional PAGE and structurally identified a group of small (approximately 180-300 nt) non-polyadenylated, Y-shaped branched RNAs. The branched Y-shaped RNAs contain the 105 nt medRNA derived intron, joined in a 2'-5' phosphodiester bond to small heterogeneously sized RNAs. These non-polyadenylated branched Y-shaped RNA molecules are analogous to the lariat shaped introns of higher eukaryotes and presumably represent the released intron-like by-products of a trans-splicing reaction which joins the mini-exon and the major coding-exon.
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2424
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Huang J, Ho JT. Light-scattering study in nematic-smectic-A-smectic-C multicritical mixtures. PHYSICAL REVIEW. A, GENERAL PHYSICS 1988; 38:400-406. [PMID: 9900178 DOI: 10.1103/physreva.38.400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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2425
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Ohya N, Huang J, Fukunaga T, Toga H. Airway pressure-volume curve estimated by flow interruption during forced expiration. TOHOKU J EXP MED 1988; 155:105-6. [PMID: 3413777 DOI: 10.1620/tjem.155.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The pressure-volume characteristics of the airway downstream to the choke point was estimated with abrupt interruption of airflow at the mouth during forced expiration. The pressure was measured at the mouth and the volume was given by the maximum flow immediately before interruption multiplied by interruption time. The compliance of the airway downstream to the choke point, i.e., a slope of the pressure-volume curve, was 1.04 ml/cmH2O at 50% FVC, and increased in lower lung volumes, in 7 healthy subjects. Whereas, in a case of tracheo-bronchopathia osteochondroplastica, its value decreased markedly.
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