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16861. Identification of Transport Processes in Soil Cores Using Fluorescent Tracers

Author:
Vanderborght, Jan; Gähwiller, Paul; Flühler, Hannes
Source:
Soil Science Society of America journal 2002 v.66 no.3 pp. 774-787
ISSN:
0361-5995
Subject:
X-radiation,   etc   ; Cambisols; chlorides; convection; dispersibility; fluorescence; fluorescent dyes; leaching; mixing; prediction; preferential flow; sodium; soil properties; solutes; sorption; sorption isotherms; streams; sulfonic acids; tracer techniques; zwitterions;     Show all 20 Subjects
Abstract:
... To identify soil properties that control transport of adsorbing solutes in natural soil, we carried out leaching experiments in undisturbed soil cores taken from three soil layers of a Stagni-Humic Cambisol. Breakthrough curves (BTCs) of Cl⁻ and two adsorbing fluorescent dye tracers, brilliant sulfaflavine (BF; 1H-Benz(de)isoquinoline-5-sulfonic acid, 2,3-dihydro-6-amino-1,3-dioxo-2-(p-tolyl)-, mo ...
DOI:
10.2136/sssaj2002.7740

16862. The synthesis and characterization of titanium silicalite-1

Author:
Li, Y. G.; Lee, Y. M.; Porter, J. F.
Source:
Journal of materials science 2002 v.37 no.10 pp. 1959-1965
ISSN:
0022-2461
Subject:
X-radiation,   etc   ; Raman spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; concentration of production; crystal structure; nitrogen; physical properties; scanning electron microscopes; silicon; titanium; titanium dioxide; zeolites;     Show all 14 Subjects
Abstract:
... This paper investigates the effect of the variation in alkoxide precursor ratio and templating agent concentration on the production of titanium silicalite (TS-1) through analysis using various physical characterisation techniques. X-ray diffraction showed clear evidence for the MFI zeolite structure and a high degree of crystallinity in all systems. For those materials prepared using a templating ...
DOI:
10.1023/A:1015234812360

16863. Study of substrate specificity of human aromatase by site directed mutagenesis

Author:
Auvray, P.; Nativelle, C.; Bureau, R.; Dallemagne, P.; Séralini, G.‐E.; Sourdaine, P.
Source:
European journal of biochemistry 2002 v.269 no.5 pp. 1393-1405
ISSN:
0014-2956
Subject:
X-radiation,   etc   ; active sites; androstenedione; aromatase; biosynthesis; catalytic activity; cytochromes; humans; molecular models; mutants; reproduction; site-directed mutagenesis; substrate specificity; testosterone;     Show all 14 Subjects
Abstract:
... Human aromatase is responsible for estrogen biosynthesis and is implicated, in particular, in reproduction and estrogen‐dependent tumor proliferation. The molecular structure model is largely derived from the X‐ray structure of bacterial cytochromes sharing only 15–20% identities with hP‐450arom. In the present study, site directed mutagenesis experiments were performed to examine the role ...
DOI:
10.1046/j.1432-1033.2002.02779.x

16864. Adequate Intakes of Vitamin E and Protein Prevent Increases of Oxidative Damage to DNA, Lipids, and Protein Induced by Total Body Irradiation in Mice

Author:
Shin, Sung Jae; Yamada, Kazuhiko
Source:
Nutrition and cancer 2002 v.44 no.2 pp. 170-174
ISSN:
0163-5581
Subject:
X-radiation,   etc   ; Adequate Intakes; DNA; DNA damage; antioxidants; dietary protein; glutathione; iron; irradiation; lipid peroxidation; lipids; liver; liver protein; mice; oxidation; spleen; thiobarbituric acid-reactive substances; vitamin E;     Show all 18 Subjects
Abstract:
... We examined the influence of the level of dietary protein or vitamin E (VE) on oxidative damage to DNA, lipids, and protein in the liver after total body irradiation (TBI) with X-rays at 1 or 4 Gy. Levels of 8-hydroxydeoxyguanosine, thiobarbituric acid-reactive substances, and protein carbonyls in the liver did not differ among the groups that did not receive TBI. However, oxidative damage to lipi ...
DOI:
10.1207/S15327914NC4402_08

16865. Isolation and Characterization of Atriplex hortensis and Sweet Chenopodium quinoa Starches

Author:
Wright, K.H.; Huber, K.C.; Fairbanks, D.J.; Huber, C.S.
Source:
Cereal chemistry 2002 v.79 no.5 pp. 715-719
ISSN:
0009-0352
Subject:
X-radiation,   etc   ; Atriplex hortensis; Chenopodium quinoa; amylose; centrifugation; colorimetry; corn starch; differential scanning calorimetry; gelatinization temperature; granules; grinding; pasting properties; scanning electron microscopy; screening; seeds; viscosity; washing;     Show all 17 Subjects
Abstract:
... Starches from garden orach (Atriplex hortensis) and sweet quinoa (Chenopodium quinoa Willd. 'Surumi') seeds were isolated, examined for compositional characteristics, and compared with bitter quinoa (Cheno-podium quinoa Willd.) starch. Garden orach and sweet quinoa seeds were similar in fat and ash contents, while garden orach seeds contained ≈10% more protein. Starches were isolated from seeds fo ...
DOI:
10.1094/CCHEM.2002.79.5.715

16866. Starch characteristics of black bean, chick pea, lentil, navy bean and pinto bean cultivars grown in Canada

Author:
Hoover, R.; Ratnayake, W.S.
Source:
Food chemistry 2002 v.78 no.4 pp. 489-498
ISSN:
0308-8146
Subject:
X-radiation,   etc   ; amylose; black beans; chickpeas; crystal structure; cultivars; gelatinization; gelatinization temperature; navy beans; peas; pinto beans; starch granules; thermal stability; viscosity; Canada;     Show all 15 Subjects
Abstract:
... The physicochemical properties of starches from different cultivars of black bean, chick pea, lentil, navy bean, smooth pea and pinto bean were examined. Starch granule size ranged from 8 to 35 μm. The starch granules were round to elliptical with smooth surfaces. The total amylose content ranged from 23.0 to 29.5%, of which 6.0–14.9% was complexed by native lipid. All starches showed a ‘C’ type X ...
DOI:
10.1016/S0308-8146(02)00163-2

16867. Structure and kinetics of formation of catechol complexes of ferric soybean lipoxygenase-1

Author:
Nelson, M.J.; Brennan, B.A.; Chase, D.B.; Cowling, R.A.; Grove, G.N.; Scarrow, R.C.
Source:
Biochemistry 1995 v.34 no.46 pp. 15219-15229
ISSN:
0006-2960
Subject:
X-radiation,   etc   ; linoleate 13S-lipoxygenase; soybeans; electron paramagnetic resonance spectroscopy; pH; catechol;     Show all 6 Subjects
Abstract:
... Ferric soybean lipoxygenase forms stable complexes with 4-substituted catechols. The structure of the complex between the enzyme and 3,4-dihydroxybenzonitrile has been studied by resonance Raman, electron paramagnetic resonance, visible, and X-ray spectroscopies. It is a bidentate iron-catecholate complex with at least one water ligand. The kinetics of formation of complexes between lipoxygenase a ...
DOI:
10.1021/bi00046a030
PubMed:
7578137

16868. Sensitivity of the conidia of plant pathogenic fungi to gamma-rays, electron particles and X-ray (Bremsstrahlung) irradiation

Author:
LebaiJuri, M.; Omar, M.; Yusof, N.
Source:
World journal of microbiology & biotechnology 1995 v.11 no.6 pp. 610-614
ISSN:
0959-3993
Subject:
X-radiation,   etc   ; physical properties; conidia; water content; plant pathogenic fungi; gamma radiation; Malaysia;     Show all 7 Subjects
DOI:
10.1007/BF00361000
PubMed:
24415005

16869. Evidence for the proximity of calcium to the manganese cluster of photosystem II: Determination by X-ray absorption spectroscopy

Author:
Latimer, M.J.; DeRose, V.J.; Mukerji, I.; Yachandra, V.K.; Sauer, K.; Klein, M.P.
Source:
Biochemistry 1995 v.34 no.34 pp. 10898-10909
ISSN:
0006-2960
Subject:
X-radiation,   etc   ; X-ray absorption spectroscopy; absorption; calcium; manganese; models; oxidation; oxygen evolving complex; stoichiometry; strontium;     Show all 10 Subjects
Abstract:
... The photosynthetic oxygen-evolving complex contains a cluster of four manganese atoms and requires both Ca and Cl for activity. The question of Ca proximity to the Mn cluster has been investigated by performing Mn X-ray absorption experiments on native samples of photosystem II (PS II) and on samples depleted of Ca and reconstituted by either Ca or Sr. Analysis of X-ray K-edge spectra demonstrates ...
DOI:
10.1021/bi00034a024
PubMed:
7662671

16870. Complex formation in yeast double-strand break repair: participation of Rad51, Rad52, Rad55, and Rad57 proteins

Author:
Hays, S.L.; Firmenich, A.A.; Berg, P.
Source:
Proceedings of the National Academy of Sciences of the United States of America 1995 v.92 no.15 pp. 6925-6929
ISSN:
0027-8424
Subject:
X-radiation,   etc   ; Saccharomyces cerevisiae; DNA repair; DNA-binding proteins; genetic recombination;     Show all 5 Subjects
Abstract:
... The repair of DNA double-strand breaks in Saccharomyces cerevisiae requires genes of the RAD52 epistasis group of which RAD55 and RAD57 are members. Here, we show that the x-ray sensitivity of rad55 and rad57 mutant strains is suppressible by overexpression of RAD51 or RAD52. Virtually complete suppression is provided by the simultaneous overexpression of RAD51 and RAD52. This suppression occurs a ...
DOI:
10.1073/pnas.92.15.6925
PubMed:
7624345
PubMed Central:
PMC41443

16871. The centric region of the X chromosome rDNA functions in male meiotic pairing in Drosophila melanogaster

Author:
Park, H.S.; Yamamoto, M.T.
Source:
Chromosoma 1995 v.103 no.10 pp. 700-707
ISSN:
0009-5915
Subject:
X-radiation,   etc   ; Drosophila melanogaster; X chromosome; ribosomal DNA; meiosis; heterochromatin; mutagenesis; chromosome pairing; males;     Show all 9 Subjects
Abstract:
... In Drosophila melanogaster males, sex chromosome pairing at meiosis is ensured by so-called pairing site(s) located discretely in the centric heterochromatin. The property of the pairing sites is not well understood. Recently, an hypothesis has been proposed that 240 bp repeats in the nontranscribed spacer region of rDNA function as the pairing sites in male meiosis. However, considerable cytogene ...
DOI:
10.1007/s004120050082
PubMed:
7664617

16872. Quantitative cotton fiber maturity measurements by X-ray fluorescence spectroscopy and advanced fiber information system

Author:
Wartelle, L.H.; Bradow, J.M.; Hinojosa, O.; Pepperman, A.B.
Source:
Journal of agricultural and food chemistry 1995 v.43 no.5 pp. 1219-1223
ISSN:
0021-8561
Subject:
X-radiation,   etc   ; cotton; calcium; cell walls; fiber quality; spectroscopy; fluorescence; dimensions; measurement; chemical constituents of plants;     Show all 10 Subjects
Abstract:
... Cotton fiber maturity is an important factor in cotton classification and fiber and textile processing. The objective of this study was to test the hypothesis that during fiber maturation, structural calcium in the primary wall is diluted by the development of the highly cellulosic secondary wall. Increases in this dilution effect on relative calcium concentration were found to parallel increasing ...
DOI:
10.1021/jf00053a018

16873. Structural consequences of ammonia binding to the manganese center of the photosynthetic oxygen-evolving complex: a X-ray absorption spectroscopy study of isotropic and oriented photosystem II particles

Author:
Dau, H.; Andrews, J.C.; Roelofs, T.A.; Latimer, M.J.; Liang, W.; Yachandra, V.K.; Sauer, K.; Klein, M.P.
Source:
Biochemistry 1995 v.34 no.15 pp. 5274-5287
ISSN:
0006-2960
Subject:
X-radiation,   etc   ; X-ray absorption spectroscopy; absorption; ammonia; manganese; oxidation; oxygen evolving complex; spinach;     Show all 8 Subjects
Abstract:
... The structure and orientation of the manganese complex in NH3-treated photosystem II (PS II) membrane particles of spinach are being studied by X-ray absorption spectroscopy. On the basis of earlier work by our group, a structure for the tetranuclear manganese complex of PS II, which consists of two di-micro-oxo-bridged binuclear Mn units linked by a mono-micro-oxo group, has been proposed [Yachan ...
DOI:
10.1021/bi00015a043

16874. Dual-energy X-ray absorptiometry and force-plate analysis of gait in dogs with healed femora after leg-lengthening plate fixation

Author:
Muir, P.; Markel, M.D.; Bogdanske, J.J.; Johnson, K.A.
Source:
Veterinary surgery 1995 v.24 no.1 pp. 15-24
ISSN:
0161-3499
Subject:
X-radiation,   etc   ; fracture fixation; densitometry; radiography; dogs; bone density; surgical equipment; forces; gait; femur;     Show all 10 Subjects
DOI:
10.1111/j.1532-950X.1995.tb01288.x
PubMed:
7701766

16875. X-Ray Orientation of Equatorial Planes in Swollen and Stretched Cellulosic Fibers

Author:
Sreenivasan, S.; Iyer, K. R. Krishna; Chidambareswaran, P. K.; Patil, N. B.
ISSN:
1746-7748
Subject:
X-radiation,   etc   ; cellulosic fibers; fabrics; lint cotton; textile fibers; viscose;     Show all 6 Subjects
Abstract:
... X-ray orientation profiles were recorded that pertained to the three equatorial planes from cotton fibers containing both cellulose I and II lattices and from viscose fibers. The changes in orientation brought about by swelling and stretching treatments could be accurately followed by studying the distribution of any one of the diffraction arcs. ...
DOI:
10.1177/004051758805800509

16876. Microbiology of Spent Nuclear Fuel Storage Basins

Author:
Santo Domingo, Jorge W.; Berry, Christopher J.; Summer, Michael; Fliermans, Carl B.
Source:
Current microbiology 1998 v.37 no.6 pp. 387-394
ISSN:
0343-8651
Subject:
X-radiation,   etc   ; analytical kits; bacterial communities; carbon; corrosion; fuels; microbial colonization; monitoring; osmium; savannas; scanning electron microscopy; sulfate-reducing bacteria;     Show all 12 Subjects
Abstract:
... Microbiological studies of spent nuclear fuel storage basins at Savannah River Site (SRS) were performed as a preliminary step to elucidate the potential for microbial-influenced corrosion (MIC) in these facilities. Total direct counts and culturable counts performed during a 2-year period indicated microbial densities of 10⁴ to 10⁷ cells/ml in water samples and on submerged metal coupons collecte ...
DOI:
10.1007/s002849900398
PubMed:
9806976

16877. The physiologic response of domestic animals to ionizing radiation: a review

Author:
Zallinger, C. von; Tempel, K.
Source:
Veterinary radiology & ultrasound 1998 v.39 no.6 pp. 495-503
ISSN:
1058-8183
Subject:
X-radiation,   etc   ; chickens; interspecific variation; acute course; longevity; sheep; goats; dosage; lethal dose; Coturnix japonica; calves; mortality;     Show all 12 Subjects
DOI:
10.1111/j.1740-8261.1998.tb01639.x
PubMed:
9845185

16878. Generation mutant mice with large chromosomal deletion by use of irradiated ES cells—analysis of large deletion around hprt locus of ES cell

Author:
Kushi, Atsubo; Edamura, Koji; Noguchi, Masato; Akiyama, Kiyotaka; Nishi, Yoshisuke; Sasai, Hitoshi
Source:
Mammalian genome 1998 v.9 no.4 pp. 269-273
ISSN:
0938-8990
Subject:
X-radiation,   etc   ; X chromosome; body weight; chimerism; clones; death; genes; germ cells; irradiation; loci; males; mice; mutants; phenotype;     Show all 14 Subjects
Abstract:
... A method of generating mice from embryonic stem (ES) cells with a large chromosomal deletion produced by X-ray irradiation has been developed. Fifty-two mutant ES clones were made that carried a nested set of chromosomal deletions up to approximately 10 cM in length around the hprt locus on the X Chromosome (Chr). Germline chimeras were generated from three ES clones with deletions ranging from 20 ...
DOI:
10.1007/s003359900747

16879. A genetic screen for elements of the network that regulates neurogenesis in Drosophila

Author:
Rottgen, G.; Wagner, T.; Hinz, U.
Source:
MGG 1998 v.257 no.4 pp. 442-451
ISSN:
0026-8925
Subject:
X-radiation,   etc   ; peripheral nerves; loci; sense organs; phenotype; suppressor genes; mutagenesis; ethyl methanesulfonate; chromosome mapping; cell differentiation; screening; Drosophila melanogaster;     Show all 12 Subjects
DOI:
10.1007/s004380050668
PubMed:
9529525

16880. Hexagonal Packing of Intermediate Filaments (Microfibrils) in α-Keratin Fibers

Author:
Feughelman, M.; James, Veronica
Source:
Textile research journal 1998 v.68 no.2 pp. 110-114
ISSN:
0040-5175
Subject:
X-radiation,   etc   ; X-ray diffraction; fabrics; formic acid; geometry; hairs; intermediate filaments; mechanical properties; models; patients; sulfur; textile fibers; wool;     Show all 13 Subjects
Abstract:
... Electron micrographs of cross sections of highly oriented α-keratin fibers show the presence of intermediate filaments (IF) (microfibrils) packed parallel to each other in hexagonal arrays. Because of the presence of this ordered packing, some form of in terfibrillar linkage or interaction is believed to exist between neighboring IFs in the six hexagonal directions. The possible presence of such l ...
DOI:
10.1177/004051759806800205