1851
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Cash PW, Zhu X, Ohta Y, Tsao J, Lackland H, Mateos-Nevado MD, Inouye M, Stein S, Jordan F, Tous GI. Synthesis of the pro-peptide of subtilisin BPN'. Pept Res 1989; 2:292-6. [PMID: 2520768] [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: 01/01/2023]
Abstract
Subtilisin, a bacterial serine protease, is secreted as pre-pro-subtilisin. Previously, we demonstrated that the pro-peptide moiety of intact pro-subtilisin can guide the folding of inactive protein to active enzyme both in an intramolecular (6) and intermolecular manner (18). Herein is reported the total chemical synthesis of the pro-sequence (77 amino acids) of pre-pro-subtilisin BPN' carried out by solid phase methods. The structure was confirmed by both sequencing and amino acid analysis of the fragment peptides resulting from a V-8 protease digest. Preliminary studies indicate that the synthetic pro-peptide itself can renature denatured subtilisin BPN'. This study demonstrates a novel method for examining protein folding with the aid of exogenously added synthetic peptides.
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Affiliation(s)
- P W Cash
- Rutgers University, Newark, NJ 07102
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1852
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Zhu X, Fahy S, Louie SG. Ab initio calculation of pressure coefficients of band gaps of silicon: Comparison of the local-density approximation and quasiparticle results. Phys Rev B Condens Matter 1989; 39:7840-7847. [PMID: 9947466 DOI: 10.1103/physrevb.39.7840] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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1853
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Lowery JM, Berti-Mattera LN, Zhu X, Peterson RG, Eichberg J. Relationship of ATP turnover, polyphosphoinositide metabolism, and protein phosphorylation in sciatic nerve and derived peripheral myelin subfractions from normal and streptozotocin diabetic rats. J Neurochem 1989; 52:921-32. [PMID: 2465383 DOI: 10.1111/j.1471-4159.1989.tb02543.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [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: 01/01/2023]
Abstract
Sciatic nerve from streptozotocin-induced diabetic rats has previously been shown to incorporate more 32P into phosphatidylinositol-4,5-bisphosphate (PIP2) and the principal myelin proteins than normal nerve. In the present study, labeling of ATP and PIP2 was compared. Using nerve segments, [gamma-32P]ATP specific activity reached a plateau after incubation for 4 h with [32P]orthophosphate, whereas the specific activity of [32P]PIP2 rose much more slowly and was still increasing after 8 h. The rate of disappearance of radioactivity from prelabeled ATP was biphasic, with 75% being lost within 30 min and the remainder declining much more slowly for several hours thereafter. In contrast, no decrease in prelabeled PIP2 radioactivity could be detected for up to 4 h. The kinetics of ATP metabolism were not appreciably different for normal and diabetic nerve. However, after incubation with [32P]orthophosphate for 2 h, the specific activity of PIP2 was 50-120% higher in diabetic nerve. This phenomenon, therefore, cannot be ascribed to altered specific activity of the ATP precursor pool. Greater labeling of PIP2 in 32P-labeled diabetic nerve was present in purified myelin isolated using a simple discontinuous sucrose density gradient, but not in a "nonmyelin" fraction. When nerve homogenate was fractionated on a more complex gradient, three myelin-enriched subfractions were obtained which were heterogeneous as judged by morphological appearance, protein profile, and lipid metabolic activity. The proportion of total lipid radioactivity accounted for by PIP2 was elevated in all the subfractions relative to the homogenate. As compared to myelin subfractions from normal nerve, an increased percentage of 32P in PIP2 was obtained only in the major myelin subfraction from diabetic nerve. The phosphorylation of P0 relative to the other myelin proteins was also enhanced in this subfraction in nerve from diabetic animals.
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Affiliation(s)
- J M Lowery
- Department of Biochemical and Biophysical Sciences, University of Houston, TX 77204-5500
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1854
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Xia X, Zhu X, Quinn JJ. Quasiparticle lifetime of excited carriers in a semiconductor superlattice. Phys Rev B Condens Matter 1989; 39:3305-3309. [PMID: 9948631 DOI: 10.1103/physrevb.39.3305] [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: 04/12/2023]
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1855
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Abstract
A significant enhancement in the mode locking of a KCl:Tl color-center laser has been observed when a length of optical fiber having positive group-velocity dispersion was incorporated within an external control cavity. Pulse durations of ~260 fsec were obtained by this method, representing a compression factor ~60x that with the colorcenter laser alone. Similar results have also been observed with an InGaAsP semiconductor diode amplifier as the nonlinear element within the control cavity.
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1856
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Bowman CD, Bowman JD, Herczeg P, Szymanski J, Yuan VW, Anaya JM, Mortensen R, Postma H, Delheij PPJ, Baker OK, Gould CR, Haase DG, Mitchell GE, Roberson NR, Zhu X, McDonald AB, Benton D, Tippens B, Chupp TE. Facility for parity and time reversal experiments with intense epithermal (eV) neutron beams. ACTA ACUST UNITED AC 1988. [DOI: 10.1007/bf02398291] [Citation(s) in RCA: 3] [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: 10/24/2022]
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1857
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Zhu X, Xia X, Quinn JJ, Hawrylak P. Collective excitations of a multiple-quantum-well system with barrier of finite height. Phys Rev B Condens Matter 1988; 38:5617-5623. [PMID: 9947004 DOI: 10.1103/physrevb.38.5617] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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1858
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Zhu X, Iga K. Characterization of ion-exchanged planar microlenses by ray tracing. Appl Opt 1988; 27:468-471. [PMID: 20523623 DOI: 10.1364/ao.27.000468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
For the design and optimization of the fabrication condition of distributed-index planar microlenses, it is necessary to evaluate the N. A., focal length, focused spot, and aberration of a fabricated lens. In this paper, a ray tracing method is improved for this purpose, and properties of planar microlenses aie evaluated. An ion concentration matrix is proposed to simplify lens design.
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1859
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Biham O, Mukamel D, Toner J, Zhu X. Renormalization-group treatment of the beta -incommensurate transition in quartz and berlinite. Phys Rev Lett 1987; 59:2439-2442. [PMID: 10035551 DOI: 10.1103/physrevlett.59.2439] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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1860
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1861
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Zhu X, Birringer R, Herr U, Gleiter H. X-ray diffraction studies of the structure of nanometer-sized crystalline materials. Phys Rev B Condens Matter 1987; 35:9085-9090. [PMID: 9941303 DOI: 10.1103/physrevb.35.9085] [Citation(s) in RCA: 229] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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1862
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Tao H, Ho K, Zhu X. Investigation of the electronic structure and phonon anharmonicity in beta - and gamma -NbH. Phys Rev B Condens Matter 1986; 34:8394-8400. [PMID: 9939553 DOI: 10.1103/physrevb.34.8394] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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1863
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1864
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Dripps JH, Manning GK, Zhu X. A signal-processing research facility and its application to the processing of fetal phonocardiographic signals for heart rate estimation. Eur J Obstet Gynecol Reprod Biol 1986; 23:281-8. [PMID: 3542620 DOI: 10.1016/0028-2243(86)90161-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Part 1 of this paper describes a real-time medical signal-processing research facility which is being developed at Edinburgh University. Part 2 describes the application of this facility to the estimation of fetal heart rate from phonocardiographic signals using a new frequency-domain estimation algorithm.
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1865
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Holbrow CH, Ghosh AP, Heinzen D, Zhu X, Quivers WW, Shimkaveg G, Pappas PG, Thomas JE, Feld MS. Complete Doppler coverage in laser optical pumping by wall-induced velocity-changing collisions. Phys Rev A Gen Phys 1986; 34:2477-2479. [PMID: 9897539 DOI: 10.1103/physreva.34.2477] [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: 05/22/2023]
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1866
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Hou JS, Ma JM, Feng HF, Zuo JN, Cheng WY, Zhu X, Huang JW, Xu WZ, Gu HD, Zhu BF. T lymphocyte subpopulations in chronic renal failure. Chin Med J (Engl) 1986; 99:321-2. [PMID: 3098513] [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: 01/04/2023] Open
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1867
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Zhu X, Qian S. [Investigation on birth desires of couples of childbearing age in Hongsheng and three other villages conforming to consideration conditions for the second birth]. Renkou Yanjiu 1986:42-4. [PMID: 12159282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
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1868
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1869
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Zhu X. Composite population kernels in ytterbium-buffer collisions studied by means of laser-saturated absorption. Phys Rev A Gen Phys 1986; 33:251-257. [PMID: 9896606 DOI: 10.1103/physreva.33.251] [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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1870
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Zhu X, Overhauser AW. Effect of an inhomogeneous resistivity on the induced-torque pattern of a metal sphere. Phys Rev B Condens Matter 1985; 31:821-824. [PMID: 9935824 DOI: 10.1103/physrevb.31.821] [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: 04/11/2023]
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1871
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Zhu X. [The public hospital in the capital of the Qing Dynasty] (Chi). Zhonghua Yi Shi Za Zhi 1985; 15:31-47. [PMID: 11611831] [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: 04/17/2023]
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1872
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Liu HQ, Zhu X, Zhao SL, Yu M, Meng XM. Preliminary report on experimental observation of the effects of magnetic field and "Natural Copper" on fracture healing. Acta Acad Med Wuhan 1984; 4:220-8. [PMID: 6527846 DOI: 10.1007/bf02857168] [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] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1873
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Lu HM, Zhu X, Hou JS, Jiang JH, Wu ZC, Xu YR, Tang S, Wang RX, Hu YF, Zhou SH. Report of 2 cases of glucagonoma syndrome with a brief review of literature. Chin Med J (Engl) 1983; 96:765-71. [PMID: 6327197] [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: 01/19/2023] Open
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