701
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Abstract
RATIONALE AND OBJECTIVES The authors report on the development and preliminary validation of a technique for measuring contrast-to-noise ratio (CNR) at all points along selected vessel segments in the original three-dimensional magnetic resonance angiography (MRA) dataset. METHODS Contrast-to-noise ratio dependencies on flow rate, field of view, and flip angle were measured on images from a conventional time-of-flight MRA pulse sequence using constant flow in a branching vascular phantom. An estimate of the inherent variability of the technique was obtained from multiple scans of a flow phantom and a human volunteer. RESULTS The overall standard deviation (SD) of the CNR was found to be approximately 6.1% of the average CNR value for the flow phantom study and 7.3% for the human study. Vessel CNR was found to increase with field of view and was found to become nonuniform for low flow rate and/or high flip angles. CONCLUSION In general, such CNR measurements allow the investigation of the mechanism of signal loss and general technique optimization in MRA.
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Affiliation(s)
- Y Du
- Department of Physics, University of Utah, Salt Lake City
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702
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Remmers EF, Goldmuntz EA, Zha H, Mathern P, Du Y, Crofford LJ, Wilder RL. Linkage map of nine loci defined by polymorphic DNA markers assigned to rat chromosome 13. Genomics 1993; 18:277-82. [PMID: 8288230 DOI: 10.1006/geno.1993.1466] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A genetic map of nine loci defined by polymorphic DNA markers was created using a single cross of F344/N and LEW/N rats. The markers contained polymorphic simple sequence repeats identified in five genes, renin (Ren), cardiac troponin T (Tnnt3), synaptotagmin (Syt2), Na+,K(+)-ATPase catalytic subunit (Atp1a2), and the Asp-, Gly-, Glu-, and Leu-tRNA gene cluster (Trnegl), as well as four anonymous DNA segments. Analysis of the segregation of the alleles of these markers in F2 intercross progeny of F344/N and LEW/N rats indicated the following locus order and distances between pairs of loci: D13N1-5 cM-Ren-1 cM-Tntt3-0 cM-Syt2-12 cM-D13N2-25 cM-Atp1a2-0 cM-Trnegl-7 cM-D13N3-4 cM-D13N4. Three of the loci, Ren, Trnegl, and Atp1a2, have previously been assigned to rat chromosome 13. Except for Ren, none of the loci have previously been mapped by linkage analysis. The markers for these loci were characterized in a total of 13 inbred rat strains (F344/N, LEW/N, LOU/MN, WBB1/N, WBB2/N, MR/N, MNR/N, ACI/N, SHR/N, WKY/N, BN/SsN, BUF/N, and LER/N) and were found to be highly polymorphic, with two to eight alleles detected for each marker. These markers expand the genetic map of the rat and should be valuable tools for future genetic studies. An examination of human and mouse comparative map information for all loci assigned to rat chromosome 13 shows significant synteny conservation with the q arm of human chromosome 1 and the distal portion of mouse chromosome 1.
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Affiliation(s)
- E F Remmers
- Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892
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703
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Mathern P, Goldmuntz EA, Zha H, Du Y, Crofford LJ, Wilder RL, Remmers EF. Four polymorphic markers on rat chromosome 12 form a single linkage group. Biochem Genet 1993; 31:441-8. [PMID: 8122998 DOI: 10.1007/bf02396228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Four PCR-typable polymorphic markers were mapped to rat chromosome 12 by linkage analysis of F2 intercross progeny of Fischer (F344/N) and Lewis (LEW/N) rat strains. The markers formed a single linkage group, covering 27.7 cM, with the following order and distance between markers: plasminogen activator inhibitor (Planh)--0.0 cM--phosphoenolpyruvate carboxykinase-related sequence 2 (Pepckr2)--15.4 cM--anonymous marker (D12N155)--12.3 cM--serine dehydratase (Sdh). All markers were identified and genotyped by PCR analysis of simple sequence repeats. The gene encoding Planh was previously assigned to rat chromosome 12, which allowed us to assign the entire linkage group to this chromosome. These markers were highly polymorphic in 13 additional inbred rat strains (BUF/N, BN/SsN, WKY/N, MNR/N, LER/N, WBB1/N, WBB2/N, MR/N, LOU/MN, SHR/N, ACI/N, SR/Jr, and SS/Jr). These markers should be useful tools for further genetic studies in rats.
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Affiliation(s)
- P Mathern
- Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892
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704
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Sun H, Du Y. The employment status of the ethnic women in China. China Popul Today 1993; 10:8-12. [PMID: 12319410] [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: 02/26/2023]
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705
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Abstract
1H spin diffusion times of toluene (MB) and tetrahydrofuran (THF) adsorbed on a series of porous solids (charcoal, SiO2 and Al2O3) were measured by a selective inversion technique. The experimental results show that they cover a wide range (from less than one millisecond to several hundreds of milliseconds). For all samples, a tri-exponential behavior was observed in the magnetization recovery processes of the negative peaks. This is attributed to the existence of the two different kinds of spin diffusion processes in addition to the T1 relaxation. One is assigned to the intermolecular spin diffusion between the surface acidic protons of the adsorbent and the organic molecules adsorbed on the solid surface, the other to the intramolecular spin diffusion of adsorbed molecules. Due to hydrogen bonding between the surface hydroxyl groups and the adsorbate, the intermolecular spin diffusion of THF adsorbed on various solids is more effective compared to that of adsorbed MB. In addition, the intermolecular 1H spin diffusion between charcoal and adsorbed THF molecules was confirmed by indirect measurement suggested by Tekely et al.
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Affiliation(s)
- F Deng
- State Key Laboratory of Magnetic Resonance, Chinese Academy of Sciences, Wuhan
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706
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Abstract
P77PMC rat is a breed of rat with congenital audiogenic seizure(AS). AS attacks were suppressed by cholecystokinin octapeptide (CCK-8) injected intraperitoneally (i.p.) at a dose of 50 micrograms/kg, but not at 25 micrograms/kg. Radioimmunoassay study showed that the CCK-8 immunoreactivity (IR) in the cerebrocortex and hippocampus is much lower in P77PMC rats than that of Wistar rats. The results suggest that a low cerebral content of CCK-8 may account for the high susceptibility of audiogenic seizure in P77PMC rats.
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Affiliation(s)
- L X Zhang
- Neuroscience Research Center, Beijing Medical University, China
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707
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Wu QL, Raychowdhury MK, Du Y, Jha PK, Leavis PC, Sarkar S. Characterization of a rabbit fast skeletal troponin I cDNA: a comparative sequence analysis of vertebrate isoforms and tissue-specific expression of a single copy gene. DNA Seq 1993; 4:113-21. [PMID: 8173075 DOI: 10.3109/10425179309020150] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A cDNA encoding skeletal fast troponin I (TnIf) has been isolated and characterized from an adult rabbit fast skeletal muscle cDNA library. This cDNA contains the entire coding region of 549 base pairs (bp), the 3' untranslated (UT) segment of 78 bp and the 5' UT segment of 74 bp. The 3' UT segment shows the predicted stem-loop structure characteristic of eukaryotic mRNAs. The cDNA-derived amino acid sequence is not identical to the chemically-derived and the recently reported cDNA-derived amino acid sequences for rabbit TnIf, and thus enables to make the necessary corrections in the sequence information. The rabbit TnIf is encoded by a single copy gene which is expressed in adult fast skeletal muscle in a tissue-specific manner. Comparative sequence analysis of the vertebrate TnI isoforms and their cDNAs shows a high level of sequence conservation in the coding region among the TnIf interspecies isoforms. The sequence similarity is markedly decreased among the fast, slow and cardiac intra- and inter-species isoforms. The C-terminal halves of TnI isoforms including a segment believed to be involved in critical interactions with actin and troponin C (TnC) show high sequence conservation whereas the N-terminal halves show considerable difference in sequence and size. The significance of these results in relation to the biological function and evolution of members of the vertebrate TnI multigene family is discussed.
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Affiliation(s)
- Q L Wu
- Department of Anatomy & Cellular Biology, School of Veterinary Medicine, Tufts University, Boston, MA 02111
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708
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Remmers EF, Goldmuntz EA, Zha H, Crofford LJ, Cash JM, Mathern P, Du Y, Wilder RL. Linkage map of seven polymorphic markers on rat chromosome 18. Mamm Genome 1993; 4:265-70. [PMID: 8099512 DOI: 10.1007/bf00417433] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A genetic linkage map of seven polymorphic markers was created with F2 intercross progeny of F344/N and LEW/N rats and assigned to rat Chromosome (Chr) 18. Five of the markers described were defined by simple sequence length polymorphisms (SSLPs) associated with five genes: transthyretin (TTR), trypsin inhibitor-like protein (TILP), beta 2 adrenergic receptor (ADRB2), olfactory neuron-specific G protein (OLF), and gap junction protein (GJA1). One marker was defined by a restriction fragment length polymorphism (RFLP) detected with a probe for the human colony stimulating factor 1 receptor (CSF1R) gene. The D18N1R locus was defined by an anonymous DNA fragment amplified by the randomly amplified polymorphic DNA (RAPD) technique with a single short primer. These seven DNA loci formed a single genetic linkage group 30.4 cM in length with the following order: TTR-6.8 cM-D18N1R-9.1 cM-TILP-4.3 cM-CSF1R-0 cM-ADRB2-10.2 cM-OLF-0 cM-GJA1. The five SSLP markers were highly polymorphic. In a total of 13 inbred rat strains analyzed (F344/N, LEW/N, LOU/MN, WBB1/N, WBB2/N, MR/N, MNR/N, ACI/N, SHR/N, WKY/N, BN/SsN, BUF/N, and LER/N), three to six alleles were detected for each marker. Remarkable linkage conservation was detected between the region of rat Chr 18 mapped and a region of mouse Chr 18. However, genes associated with these markers have been mapped to three different human chromosomes (Chrs 5, 6, and 18). The markers described here should be useful for genetic mapping studies and genetic monitoring of inbred rat strains.
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Affiliation(s)
- E F Remmers
- Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892
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709
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Ott E, Du Y, Sreenivasan KR, Juneja A, Suri AK. Sign-singular measures: Fast magnetic dynamos, and high-Reynolds-number fluid turbulence. Phys Rev Lett 1992; 69:2654-2657. [PMID: 10046550 DOI: 10.1103/physrevlett.69.2654] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [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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710
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Van Surell C, Boczkowski J, Pasquier C, Du Y, Franzini E, Aubier M. Effects of N-acetylcysteine on diaphragmatic function and malondialdehyde content in Escherichia coli endotoxemic rats. Am Rev Respir Dis 1992; 146:730-4. [PMID: 1519854 DOI: 10.1164/ajrccm/146.3.730] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We evaluated the effects of sublethal Escherichia coli endotoxemia with or without concomitant administration of N-acetylcysteine, an antioxidant agent, on diaphragmatic strength, endurance, and malondialdehyde (MDA) content in rats. One hundred ninety rats were inoculated subcutaneously on 2 successive days with 0.6 and 1.2 mg/100 g body weight of E. coli lipopolysaccharide respectively (E animals, n = 100) or saline (C group, n = 90). E and C animals were divided into two groups based on administration of endotoxin or saline alone (E group, n = 55; C group, n = 47, respectively) or endotoxin or saline plus N-acetylcysteine (1 g/kg body weight/day intraperitoneally) (E-NAC group, n = 45; C-NAC group, n = 43, respectively). Diaphragmatic strength was assessed in vivo 48 h after the first endotoxin or saline administration by measuring the transdiaphragmatic pressure (Pdl) generated during electrical stimulation of the phrenic nerves at 0.5, 10, 20, 30, 50, and 100 Hz. Endurance index was calculated as the percent ratio of Pdl generated after 30 s of phrenic stimulation at 10 Hz divided by the initial force. Diaphragmatic MDA (fluorometric technique) was measured 0, 6, 18, 30, 42, and 48 h after the first dose of endotoxin or saline. Pdl for 50 and 100 Hz was significantly reduced in Group E as compared with group C. This phenomenon was associated with a reduced endurance performance as assessed by a lower diaphragmatic endurance index in E as compared with C animals (90.9 +/- 4.2 versus 114.3 +/- 4.1 respectively; p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- C Van Surell
- Laboratoire de Pathologie Expérimentale, INSERM U 226, Faculté Xavier Bichat, Paris, France
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711
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Radovick S, Nations M, Du Y, Berg LA, Weintraub BD, Wondisford FE. A mutation in the POU-homeodomain of Pit-1 responsible for combined pituitary hormone deficiency. Science 1992; 257:1115-8. [PMID: 1509262 DOI: 10.1126/science.257.5073.1115] [Citation(s) in RCA: 261] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Pit-1 is a pituitary-specific transcription factor responsible for pituitary development and hormone expression in mammals. Mutations in the gene encoding Pit-1 have been found in two dwarf mouse strains displaying hypoplasia of growth hormone, prolactin, and thyroid-stimulating, hormone-secreting cell types in the anterior pituitary. A point mutation in this gene was identified on one allele in a patient with combined pituitary hormone deficiency. Mutant Pit-1 binds DNA normally but acts as a dominant inhibitor of Pit-1 action in the pituitary.
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Affiliation(s)
- S Radovick
- Department of Pediatrics, Rainbow Babies and Childrens Hospital, Cleveland, OH
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712
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Ren X, Zhang X, Du Y, Li X, Liu S. [Research on the nursing stroke patients during past 10 years]. Zhonghua Hu Li Za Zhi 1991; 26:369-71. [PMID: 1914029] [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: 12/29/2022]
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713
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Xu GZ, Du Y, Chen DZ. [Effect of hyperthermal environment on urinary excretion of beta 2-microglobulin and hydrogen ion]. Zhonghua Nei Ke Za Zhi 1990; 29:581-4, 636. [PMID: 2085995] [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: 12/30/2022]
Abstract
By randomized sampling, 1387 cases working in various circumstances in Chengdu Seamless Steel Tube Plant had their urine net acid clearance (NAC) and osmotic pressure (OSMP) measured, of whom 407 took urine beta 2m examination in addition. Results show that both NAC and OSMP are much higher in the hyperthermal group than in the non-hyperthermal group. There is no significant difference in beta 2m level between the two groups, which demonstrates that the function of proximal renal tubules of the workers in this plant has not been affected, as their working condition conforms to the standards for the prevention of workers made by the government. However, the beta 2m level in the male workers is obviously higher than that in the female. There exists the possibility that the males have contacted the toxic dust at a longer duration, which may be a factor involved in the tubular disorder. The rise of beta 2m together with age is regarded as due to senile decay. This study has provided available data for the set up of worker's prevention system.
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Affiliation(s)
- G Z Xu
- Dept. of Medicine, West China University of Medical Sciences
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714
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Du Y, Xu G, Zhong L, Liu X. [Various methods for purification of urine Tamm-Horsfall protein]. Hua Xi Yi Ke Da Xue Xue Bao 1990; 21:267-70. [PMID: 2093062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The measurements of serum, urine Tamm-Horsfall protein (THP) and its antibody are essential to the early diagnosis of tubulointerstitial diseases and acute rejection after renal transplantation. The purification of THP proves to be the key procedure for the production of diagnostic kit. Once, twice and three times salt precipitation with 0.58 mol/L NaCl and chromatography with Sephadax G-200 were adopted to purify urine THP. Enzyme immunoassay was used to detect the antigenicity of the products, SDS-PAGE to determine the molecular weight (MW) and the electrophoretic purity (EP), Beckman DU-7 model spectrophotometer to scan the ultraviolet absorption spectrum. Evaluation of the four methods was based on the purity and the antigenicity of the produced THP, the output, the complexity of procedure, and the cost of required materials. Results show that the MW of THP is 93.0 kd; the ultraviolet absorption maximum is at lambda = 278 nm; the outputs are 7.5, 5.5, 3.8, and 0.4 mg/L; the concentrations of THP with antigenicity are 65%, 75%, 98% and 100%, respectively, and the EPs of three times salt precipitation and chromatography are better. It is concluded that three times salt precipitation should be recommended because of its excellence in purity and antigenicity of the produced THP, the simplicity of manipulation, and the cheapness of the materials needed.
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715
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Wei J, Cao S, Liang N, Du Y. [Chemical components of bee's pollen from buckwheat (Fagopyrum esculentum Moench)]. Zhongguo Zhong Yao Za Zhi 1990; 15:293-5, 318. [PMID: 2275781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- J Wei
- Experiment Center, Kunming Medical College
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716
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Du Y. [Nursing care of patients with allergic shock caused by intensive CT]. Zhonghua Hu Li Za Zhi 1988; 23:457-8. [PMID: 3208386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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717
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Du Y. [[The change of the population age structure and employment]]. Renkou Yanjiu 1988:14-6. [PMID: 12342512] [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: 02/26/2023]
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718
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Tang H, Qiu ZQ, Du Y, Xiao G, Chien CL, Walker JC. Magnetic ordering in GdBa2(Cu0.94Fe0.06)3O9- delta below the superconducting transition temperature. Phys Rev B Condens Matter 1987; 36:4018-4020. [PMID: 9943368 DOI: 10.1103/physrevb.36.4018] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [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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719
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Xiao SZ, Du Y. Catgut heterograft for myringoplasty. Experimental study and clinical use. Chin Med J (Engl) 1986; 99:520-2. [PMID: 3100197] [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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