3601
|
Bachur NR, Yu F, Johnson R, Hickey R, Wu Y, Malkas L. Helicase inhibition by anthracycline anticancer agents. Mol Pharmacol 1992; 41:993-8. [PMID: 1614415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Helicases are essential to both DNA replication and transcription because they separate double-stranded DNA, preparing the single strands for replication or transcription. Because the anti-cancer anthracycline antibiotics stabilize double-stranded DNA primarily by their intercalative binding, we expected the intercalated antibiotics to interfere with helicase action. We examined anthracycline antibiotic effects on SV40 large T antigen helicase activity, using a duplex DNA helicase substrate of 32P-labeled 17-mer annealed to complementary M13mp19(+) circular single-stranded DNA. The T antigen helicase activity was potently inhibited by the anthracycline antibiotics. The T antigen helicase IC50 values for the anthracycline antibiotics were as follows: nogalamycin, 2 x 10(-7) M; daunorubicin, 4 x 10(-7) M; doxorubicin, 4 x 10(-7) M; idarubicin, 1.8 x 10(-6) M; 4'-epidoxorubicin, 2 x 10(-6) M; aclacinomycin, 4 x 10(-6) M; and menogaril, 6 x 10(-6) M. Partially purified helicases from HeLa cells and murine mammary carcinoma FM3A cells also were potently inhibited by doxorubicin, with IC50 values of 4 x 10(-7) M and 9 x 10(-7) M, respectively. Because the abundance, specificities, and types of helicases vary in the cell, this site of action for anthracycline antibiotics may help explain anthracycline potency, drug specificity for DNA or RNA inhibition, and some types of cellular resistance to these drugs.
Collapse
|
3602
|
Lysz TW, Lin C, Fu SC, Wu Y. Temporal and regional production of 12(S)hydroxyeicosatetraenoic acid [12(S)-HETE] in rat lens. Exp Eye Res 1992; 54:769-74. [PMID: 1623962 DOI: 10.1016/0014-4835(92)90032-n] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Enzymatic production of 12(S)-hydroxyeicosatetraenoic acid [12(S)-HETE] from exogenous arachidonic acid (AA) was studied in the 9000 g supernatant fraction of either whole rat lens or the capsule-epithelium and cortex-nucleus regions with age (4-180 days). Whole rat lens 12(S)-HETE synthetic capacity measured either by RIA or HPLC was significantly decreased with lens growth. 12(S)-HETE production was highest in the 4-day-old rat lens, the earliest time point measured, and declined to background levels by 6 months of age. Regional studies demonstrated that the capsule-epithelium possessed a higher specific activity in comparison to the cortex-nucleus. However, lipoxygenase activity decreased significantly faster in the capsule-epithelium compared to the cortex-nucleus. The bulk of the 12-lipoxygenase activity was located in the cortex-nucleus due to the higher amount of tissue in the region. The elevated lipoxygenase activity in the neonate and its rapid decline with growth suggests that the enzyme may contribute in transforming the epithelial cells to fiber cells.
Collapse
|
3603
|
Wu Y, Doi K, Giger ML, Nishikawa RM. Computerized detection of clustered microcalcifications in digital mammograms: applications of artificial neural networks. Med Phys 1992; 19:555-60. [PMID: 1508089 DOI: 10.1118/1.596845] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Artificial neural networks have been applied to the differentiation of actual "true" clusters from normal parenchymal patterns and also to the differentiation of actual clusters from false-positive clusters as reported by a computerized scheme for the detection of microcalcifications in digital mammograms. The differentiation was carried out in both the spatial and frequency domains. The performance of the neural networks was evaluated quantitatively by means of receiver operating characteristic (ROC) analysis. It was found that the networks could distinguish clustered microcalcifications from normal nonclustered areas in the frequency domain, and that they could eliminate approximately 50% of false-positive clusters of microcalcifications while preserving 95% of the positive clusters, when applied to the results of the automated detection scheme. A large, comprehensive training database is needed for neural networks to perform reliably in clinical situations.
Collapse
|
3604
|
Kasahara T, Wu Y, Sakurai Y, Oguchi K. Suppressive effect of acupuncture on delayed type hypersensitivity to trinitrochlorobenzene and involvement of opiate receptors. INTERNATIONAL JOURNAL OF IMMUNOPHARMACOLOGY 1992; 14:661-5. [PMID: 1325956 DOI: 10.1016/0192-0561(92)90128-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We reported previously that electroacupuncture (Acu) at an acu-point equivalent to GV-4 in mice either enhanced or suppressed the delayed type hypersensitivity (DTH) to 2,4,6-trinitrochlorobenzene (TNCB, picryl chloride) depending on the time of treatment. We report here the suppression of the efferent phase of DTH to TNCB by Acu in mice. In 7- to 9-week-old male BALB/c, C57BL/6 and ddY mice, significant suppression of the DTH was observed when Acu had been applied once per day for three consecutive days before TNCB challenge. When Acu had been applied a single, significant suppression also occurred. Application to another point (at a middle area of the femoral muscle) failed to suppress the DTH to TNCB. This Acu-evoked DTH suppression was blocked dose-relatedly by pretreatment of systemic naloxone hydrochloride, indicating that opioid receptor-mediated mechanisms are involved in this immune response.
Collapse
|
3605
|
Wu Y, Fang D. [Advance in pharmacology of potassium channels in cardiovascular system and their clinical use]. ZHONGHUA YI XUE ZA ZHI 1992; 72:180-3. [PMID: 1319810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
3606
|
Wu Y. [Prevention of post-operative infection by using antibiotics of 217 cases of cesarean section]. ZHONGHUA FU CHAN KE ZA ZHI 1992; 27:73-5, 123. [PMID: 1395888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A prospective study was undertaken to compare the efficacy of local antibiotics irrigation with that of systemic antibiotics in Cesarean section patients in the prophylaxis of post-operative infection. 217 patients delivered by Cesarean section were randomly divided into three groups: (1) intrauterine and pelvic irrigation with ampicillin; (2) systemic use of penicillin+gentamycin (intravenously and intramuscularly); (3) control group: no antibiotics given. The incidences of post-operative infection for the two treatment groups were significantly lower than control group, and the difference of post-operative infection between the two treatment groups was not statistically significant. It suggests that administration of antibiotics either by local irrigation with ampicillin or by systemic using of penicillin+gentamycin are just as effective in preventing post-operative infection. In our study, 8 out of 10 of the positive cultures from the uterine cavity of non-elective Cesarean section cases became negative after irrigation. This implies that antibiotic irrigation has the effect of reducing bacterial flora locally. Two to three days after operation, the incidences of positive uterine cavity culture for the two treatment groups were lower than control group, but not of statistical significance. Therefore, it remains to be clarified whether prophylactic use of antibiotics can prevent the vaginal flora from ascending into the upper genital tract.
Collapse
|
3607
|
Li X, Wu Y, Guo Z, Liu L. [Effect of sodium 18 beta-glycyrrhetate on experimental arrhythmia]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1992; 17:176-8, inside backcover. [PMID: 1418542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The effect of sodium 18 beta-glycyrrhetate (SGA) on experimental arrhythmia was investigated. The result shows that SGA strongly counteracts arrhythmia induced by chloroform of chloroform adrenaline, lengthens the appearance time of arrhythmia induced by CaCl2, slightly retards the heart rate of rats and rabbits, and partly antagonizes the acceleration effect of isoproterenol on rabbit hearts.
Collapse
|
3608
|
Wu Y, Montes JG, Sjodin RA. Determination of electric field threshold for electrofusion of erythrocyte ghosts. Comparison of pulse-first and contact-first protocols. Biophys J 1992; 61:810-5. [PMID: 1504251 PMCID: PMC1260298 DOI: 10.1016/s0006-3495(92)81885-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Rabbit erythrocyte ghosts were fused by means of electric pulses to determine the electrofusion thresholds for these membranes. Two protocols were used to investigate fusion events: contact-first, and pulse-first. Electrical capacitance discharge (CD) pulses were used to induce fusion. Plots of fusion yield vs peak field strength yielded curves that intersected the field strength axis at positive values (pseudothresholds) which depended on the protocol and decay half time of the pulses. It was found that plots of pseudothreshold vs reciprocal half time were linear for each protocol; when extrapolated to reciprocal half time = 0 (i.e., t----infinity), these lines intersected the ordinate at values of the field strength considered to be the true electrofusion thresholds. In this fashion, the contact-first protocol gave an electrofusion threshold of 46.5 +/- 11.5 V/mm for hemoglobin-free ghosts (white ghosts) and 40.9 +/- 8.8 V/mm for ghosts with fractional hemoglobin (pink ghosts), while the threshold for the pulse-first protocol applied to pink ghosts was determined to be 93.4 +/- 11.0 V/mm. Although the thresholds depended on the electrofusion protocol, plots of critical field strength vs reciprocal time had the same slopes, i.e., approximately 24 Vs/mm. The results suggest that the fusogenic state induced by an electric pulse in either the contact-first protocol or the pulse-first protocol (long-lived fusogenic state) may in fact share a common mechanism, if the two states are not actually identical.
Collapse
|
3609
|
Brick DH, Widgoff M, Beilliere P, Lutz P, Narjoux JL, Gelfand N, Alyea ED, Bloomer M, Bober J, Busza W, Cole B, Frank TA, Fuess TA, Grodzins L, Hafen ES, Haridas P, Huang D, Huang HZ, Hulsizer R, Kistiakowsky V, Ledoux RJ, Milstene C, Noguchi S, Oh SH, Pless IA, Steadman S, Stoughton TB, Suchorebrow V, Tether S, Trepagnier PC, Wadsworth BF, Wu Y, Yamamoto RK, Cohn HO, Calligarich E, Corti G, Dolfini R, Gianini G, Introzzi G, Ratti S, Badiak M, DiMarco R, Jacques PF, Kalelkar M, Plano RJ, Stamer PE, Brucker EB, Koller EL, Alexander G, Grunhaus J, Levy A, Brau JE, Bugg WM, Condo GT, Handler T, Hargis HJ, Hart EL, Rafatian A, Rogers AH, Kitagaki T, Tanaka S, Yuta H, Abe K, Hasegawa K. Neutral-strange-particle production in 200-GeV/c p/ pi +/K+ interactions on Au, Ag, and Mg. Int J Clin Exp Med 1992; 45:734-742. [PMID: 10014431 DOI: 10.1103/physrevd.45.734] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
3610
|
Sainz J, Pevny L, Wu Y, Cantor CR, Smith CL. Distribution of interspersed repeats (Alu and Kpn) on NotI restriction fragments of human chromosome 21. Proc Natl Acad Sci U S A 1992; 89:1080-4. [PMID: 1736290 PMCID: PMC48389 DOI: 10.1073/pnas.89.3.1080] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Interspersed repeated sequences (Alu and Kpn) were used as probes to detect a set of Not I restriction fragments of human chromosome 21 from the hybrid cell line WAV17. Forty different Not I fragments, ranging in size from less than 0.05 megabase (Mb) to 7.0 Mb, were identified. The total length of these fragments was 47.3 Mb. This length provides an estimate of the minimum size of the chromosome and a minimum number of fragments to be ordered to create a complete restriction map. The average length Not I fragment is 1.2 Mb. Alu and Kpn fragments are not always coincident: a 2.9-Mb fragment is detected with Kpn but not with Alu, and 13 fragments, ranging from less than 0.05 Mb to 5.6 Mb, are detected with Alu but not with Kpn; the 26 remaining fragments, covering 75% (35.3 Mb) of the total length, are detected with both repetitive probes. The presence of so many noncoincident fragments and the high variation of the hybridization signal intensities of the fragments suggest a very nonuniform distribution of Kpn and Alu repeats.
Collapse
|
3611
|
Chang F, Wang L, Zhao Q, Zhu Q, Wu Y, Chen C, Syrjänen S, Syrjänen K. Investigation on the carcinogenic effects of coal tar pitch in rat respiratory tract by intratracheal instillations. Carcinogenesis 1992; 13:233-9. [PMID: 1740013 DOI: 10.1093/carcin/13.2.233] [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: 12/28/2022] Open
Abstract
The effects of coal tar pitch (CTP) on the tracheobronchial mucosa of Wistar rats were studied. Three groups of animals received 10 weekly intratracheal instillations of CTP at the cumulative doses of 6.48, 136.56 and 200 mg respectively. The control group of rats received 10 weekly intratracheal instillations of charcoal powder at a cumulative dose of 20 mg. The study in which the animals were killed serially revealed that CTP had conspicuous damage on the respiratory system of rats, especially on the bronchiolo-alveolar areas. The lesions induced by CTP ranged from hyperplastic, metaplastic and dysplastic changes to extensive cancers. These lesions were usually multifocal, and were more severe in the rats receiving higher dosages of CTP. The deposition of CTP particles within or adjacent to these lesions could be readily identified. Lung cancers occurred in 12.5% (4/32) and 25% (10/40) of the rats treated with 136.56 and 200 mg of CTP, whereas no tumors were found in control rats and the rats that received 6.48 mg of CTP. The overall cancer incidence significantly related to the cumulative dose of CTP. The histological types of lung cancers consisted of squamous cell carcinomas (10 out of the 14 lung cancers), adenocarcinoma (1/14), and combined squamous and adenocarcinomas (3/14). The development of CTP-induced rat lung cancers appears to derive from the hyperplasias of bronchiolo-alveolar epithelium, and processing stages of squamous metaplasias and/or dysplasias to carcinomas. The present results confirmed the carcinogenic effects of CTP on the respiratory system of rats, and provided experimental evidence for human lung carcinogenesis, particularly in those occupationally exposed to coal tars or tar products.
Collapse
|
3612
|
Zhou MD, Wu Y, Kumar A, Siddiqui MA. Mechanism of tissue-specific transcription: interplay between positive and negative regulatory factors. Gene Expr 1992; 2:127-38. [PMID: 1633436 PMCID: PMC6057385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/1991] [Accepted: 02/06/1992] [Indexed: 12/28/2022]
Abstract
At least four regulatory cis-acting DNA sequences, CCAAAAGTGG (element A), TTATTTTTA (element B), TATTTATT (element C), and TATTACCTTTAT (element S), were identified in cardiac myosin light chain-2 (MLC2) proximal promoter as target sites for sequence-specific binding of nuclear proteins. For muscle-specific transcription, the proximal promoter (-53 to +1) consisting only of elements B and C is required. Addition of element A to this promoter results in a muscle-specific up-regulation, whereas the addition of element S exerts a negative effect on transcription. The negative and positive regulatory effects of elements S and A respectively were demonstrated by site-specific mutations of the promoter following transient transfection of cardiac muscle cells in culture. Elements S and A interact separately with distinct nuclear protein factor present in both muscle and non-muscle cells, even though their regulatory activities are restricted to muscle cells. Among the multiple complexes resulting from the interaction of nuclear proteins and elements S and A DNAs, one requires both S and A sequences together for binding. Element B, which exerts a muscle-specific positive effect on transcription, binds to a nuclear protein present in cardiac muscle, but not in non-muscle cells. DNA-protein binding assays and mutational analysis of the MLC2 promoter suggest that the contribution of the functionally opposed cis-elements depends upon an interplay between the positively and negatively acting DNA-binding proteins via protein-protein interactions to mediate opposite regulatory effects on gene transcription.
Collapse
|
3613
|
Boolchand P, Pradhan S, Wu Y, Abdelgadir M, Huff W, Farrell D, Coussement R, McDaniel D. Mössbauer-effect studies and magnetization of grain-aligned YBa2(Cu1-xFex)4O8: Debye-Waller-factor, electric-field-gradient, and critical-current anisotropies. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:921-930. [PMID: 10001133 DOI: 10.1103/physrevb.45.921] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
3614
|
Jelinek R, Chmelka BF, Wu Y, Davis ME, Unlan JG, Gronsky R, Pines A. Adsorption effects in aluminophosphate molecular sieves studied by27Al double-rotation NMR. Catal Letters 1992. [DOI: 10.1007/bf00770899] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
3615
|
Yoshimi F, Nakamura K, Zhu Y, Suzuki M, Funakoshi Y, Carrieri G, Wu Y, Furukawa H, Demetris AJ, Todo S. Canine total orthotopic small bowel transplantation under FK 506. Transplant Proc 1991; 23:3240-2. [PMID: 1721422 PMCID: PMC3019083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
3616
|
Wu Y, Pradhan S, Boolchand P. Motional broadening of 57Fe Mössbauer-effect resonance in cuprate superconductors. PHYSICAL REVIEW LETTERS 1991; 67:3184-3187. [PMID: 10044662 DOI: 10.1103/physrevlett.67.3184] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
3617
|
Wu Y, Zhao Q, Anderson JM, Hiltner A, Lodoen GA, Payet CR. Effect of some additives on the biostability of a poly(etherurethane) elastomer. ACTA ACUST UNITED AC 1991. [DOI: 10.1002/jbm.820251109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
3618
|
Wu Y. [Electrophysiologic study on atrioventricular nodal concealed conduction]. ZHONGHUA YI XUE ZA ZHI 1991; 71:581-4. [PMID: 1665395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
3619
|
Wu Y, Moser JB, Jameson LM, Malone WF. The effect of oxidation heat treatment of porcelain bond strength in selected base metal alloys. J Prosthet Dent 1991; 66:439-44. [PMID: 1791553 DOI: 10.1016/0022-3913(91)90502-n] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Base metal alloys have been widely used for fixed partial dentures in the past decade. The oxidation heat treatment (degassing) of these alloys is a controversial step to prepare the metal surface for bonding porcelain. This study evaluated the effect of oxidation heat treatment on the porcelain bond strength of base metal alloys and investigated composition changes that may have occurred during this process.
Collapse
|
3620
|
Wu Y, Luo C, Yang C, Wang Z, Li F. [Observation of curative effect of refined interferon-alpha on viral pneumonia in infants]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1991; 22:420-3. [PMID: 1814826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Fifteen cases of viral pneumonia in infants were treated with refined interferon-alpha and antibiotics. Clinical symptoms of the cases with IFN-alpha were relieved in 1.40-2.79 days, earlier than those of the control. Clinical recovery time was on the average shorter than that of the control by 1.9 days, and complete recovery by 1.5 days. The difference is statistically significant. It suggested that the clinical effect of IFN-alpha together with antibiotics is better than that of antibiotics alone. There was no significant change between the experimental and control groups in absolute lymphocyte count Ig and T-cell, but OKT3 increased and OKT8 decreased slightly. The study shows that IFN is an effective and safe administration for viral pneumonia.
Collapse
|
3621
|
Wu Y, Cai R, Zhou B, Xu X. Effects of genetic factors and dietary electrolytes on blood pressure of rural secondary school students in Hanzhong. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 1991; 6:148-52. [PMID: 1793877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In this study, 24-h urine specimens were collected on 3 consecutive days from 181 adolescents (94 boys and 87 girls), aged 12-16 years, in a rural district--Hanzhong, Shaanxi Province, and sodium, potassium, calcium and magnesium levels were determined. Dietary intake of the four electrolytes and blood pressure were measured in children and their parents on the same consecutive days. The results were as follows: urinary output of calcium and magnesium might not be an appropriate index to reflect intake; after adjusting for age, sex, BMI, heart rate, and parental blood pressure, the ratio of dietary calcium to total calories was negatively related to diastolic blood pressure in the whole group, and the ratio of urinary calcium to creatinine was positively related to systolic blood pressure in girls; not only blood pressure but also its relation to electrolytes are affected by parental blood pressure after adjusting for age, sex, BMI and heart rate.
Collapse
|
3622
|
Liu W, Teng TY, Wu Y, Huang HW. Phase determination for membrane diffraction by anomalous dispersion. Acta Crystallogr A 1991. [DOI: 10.1107/s0108767391004002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
3623
|
Xu J, Wu Y, Liu S, Zhang G, Sun D, Song Y, Chen H. High-performance self-pumped phase conjugator with a multichannel in KNSBN:Cu crystal. OPTICS LETTERS 1991; 16:1255-1257. [PMID: 19776936 DOI: 10.1364/ol.16.001255] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A Cu-doped (0.04 wt. %) (K(0.5)Na(0.5))(0.2)(Sr(0.61) Ba(0.39))(0.9)Nb(2)O(6) crystal produced as much as 68% self-pumped phaseconjugate reflectivity at the laser wavelength lambda = 514.5 nm. We also observed some phenomena that helped us to understand the mechanism for the self-pumped phase-conjugate mirror.
Collapse
|
3624
|
Wu Y. [Chronic alcoholism and cerebral atrophy]. ZHONGHUA SHEN JING JING SHEN KE ZA ZHI = CHINESE JOURNAL OF NEUROLOGY AND PSYCHIATRY 1991; 24:218-9, 252. [PMID: 1954793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This paper reports the analysis of clinical manifestations and CT scan of 12 cases of chronic alcoholism. It is shown that there are mental drop in all the patients and cerebral atrophy in 11 patients. It is also shown that mental drop and cerebral atrophy have relations to the amount and history of drinking. In recent years the incidence of chronic alcoholism is tending to rise. This harm caused by alcoholism must be paid attention to.
Collapse
|
3625
|
Bayles SW, Beckham S, Leidig PR, Montrem A, Taylor ML, Wright TM, Wu Y, Schuh MD. Demonstration that phosphorescent 6-bromo-2-naphthyl sulfate can be used to probe heme accessibility in heme proteins. Photochem Photobiol 1991; 54:175-81. [PMID: 1780354 DOI: 10.1111/j.1751-1097.1991.tb02004.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The phosphorescence properties of 6-bromo-2-naphthyl sulfate (BNS) in aqueous solution were studied. The phosphorescence lifetime is several hundred microseconds and is self-quenched. Although a fluorescent photoproduct is formed from BNS, it does not interfere with the decay properties of triplet-state BNS and its utility as a probe of the accessibility of the heme group in heme proteins. Quenching of BNS phosphorescence does not occur for the non-heme protein lysozyme and apomyoglobin but occurs by a dynamic mechanism with a quenching constant of 1-2 x 10(9) M-1 s-1 for cytochrome c and myoglobin and with a quenching constant of 6.2 x 10(9) M-1 s-1 for protoporphyrin IX. The phosphorescence of an inclusion complex of 1-bromonaphthalene and beta-cyclodextrin is not quenched by heme-containing proteins. The temperature and viscosity dependencies of the rate with which BNS phosphorescence is quenched by microperoxidase-11 are consistent with unit quenching efficiency. These results indicate that quenching of BNS phosphorescence occurs only upon contact with the quencher, and the quenching constant can be used to assess the degree of accessibility of the heme group.
Collapse
|