4126
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Liu L, Liu JT. Theory of the bound magnetic polaron in antiferromagnetic semiconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:1797-1803. [PMID: 9938487 DOI: 10.1103/physrevb.33.1797] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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4127
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Gao XS, Liu L, Yuan XB. [Median-knee saphenous neurovascular flap for ipsilateral or cross-leg transfer]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1986; 24:36-7, 63. [PMID: 3720447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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4128
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Liu L, Zhang M, Gao JX, Cao L. [Respiratory related neurons in the septum of the limbic system of the rabbit]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1985; 37:290-4. [PMID: 3834604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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4129
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Liu L, Zhang M, Gao JX. [Respiratory related neurons in the dorsal hippocampus of the limbic system of the rabbit]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1985; 37:295-8. [PMID: 3834605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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4130
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Liu L, Booth J, Merriam GR, Barnes KM, Sherins RJ, Loriaux DL, Cutler GB. Evidence that synthetic 31-amino acid inhibin-like peptide lacks inhibin activity. Endocr Res 1985; 11:191-7. [PMID: 3938735 DOI: 10.1080/07435808509032977] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We studied the biological activity of a recently characterized 31-amino acid inhibin-like peptide (ILP) using a synthetic preparation. While the material yielded a single component on chromatography, amino acid sequence analysis suggested that only 30% of the molecules possess the complete structure. Bioactivity was tested in vitro using whole pituitaries from 25 day-old male Sprague-Dawley rats. Pituitaries were incubated with 500 ng/ml of the ILP preparation or vehicle alone for 60 min, followed by a 3 h exposure to 2 ng/ml of luteinizing hormone releasing hormone (LHRH) or its diluent. In the ILP-incubated pituitary media, no significant suppression of basal FSH and LH release or stimulated FSH release was observed, while a significant increase in stimulated LH release was seen (p less than 0.05). An in vivo bioassay study was performed on 38 day-old male Sprague-Dawley rats. Test animals were injected with 0.1, 1, 10 or 20 mcg of ILP immediately after castration, and 10 and 24 h later. Control animals received bovine serum albumin or vehicle alone. There were no statistically significant differences in serum LH or FSH concentrations taken at 30 h after castration between the ILP-treated rats and controls. Possible reasons for our inability to demonstrate inhibin bioactivity (selective FSH suppression) with this ILP preparation include: Only about 30% of the peptides had the complete amino acid sequence. Other peptides with deletions might have acted as antagonists, thus obscuring the inhibin bioactivity. The 31-amino acid ILP may not be the authentic inhibin molecule. We suggest that further studies are needed to determine the true identity of inhibin.
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4131
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Ross W, Rowe T, Glisson B, Yalowich J, Liu L. Role of topoisomerase II in mediating epipodophyllotoxin-induced DNA cleavage. Cancer Res 1984; 44:5857-60. [PMID: 6094001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Epipodophyllotoxins are an important new class of anticancer agents which include the compounds VM-26 (teniposide) and VP-16 (etoposide). The mechanism of action of these drugs appears to involve production of DNA single- and double-strand breaks by virtue of a temperature-sensitive interaction between drug and a heat-labile intranuclear component. We now report evidence indicating that type II topoisomerase is the likely intracellular target for the DNA strand-breaking effects of the epipodophyllotoxins. Both VM-26 and VP-16 stimulate site-specific DNA cleavage by a highly purified calf thymus type II topoisomerase. VM-26 is 5- to 10-fold more potent than VP-16 in this assay, a difference that is also seen when DNA strand breaks are assayed in isolated nuclei of mouse leukemia cells following drug exposure. Furthermore, a similar potency difference exists with respect to cytotoxicity. Equilibrium dialysis experiments using [3H]VP-16 indicate that the drug does not bind to DNA. Thus, we suggest that the epipodophyllotoxins exert their anti-cancer effects by "poisoning" type II topoisomerase without binding to DNA. In this regard, their actions may be analogous to those of nalidixic acid in bacteria.
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4132
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Murre C, Choi E, Weis J, Seidman JG, Ozato K, Liu L, Burakoff SJ, Reiss CS. Dissection of serological and cytolytic T lymphocyte epitopes on murine major histocompatibility antigens by a recombinant H-2 gene separating the first two external domains. J Exp Med 1984; 160:167-78. [PMID: 6203998 PMCID: PMC2187433 DOI: 10.1084/jem.160.1.167] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
A novel H-2 gene in which the first external (N) domain of the H-2Ld antigen was replaced with that of the H-2Dd antigen was constructed and introduced into L cells. A transformant expressing the products of the hybrid gene was studied for binding to monoclonal antibodies specific for H-2Ld and H-2Dd antigens. It was found that serological determinants are distributed both in the N (Dd) and Cl (Ld) domains. Determinants recognized by allospecific cytotoxic T lymphocytes (CTLs) and virus-specific CTLs also mapped to the N and Cl domains. Determinants recognized by vesicular stomatitis virus (VSV)-specific effect cells, however, were not present on the recombinant molecule. These results show that a recombinant gene of two H-2 antigens in which the first external domain has been reshuffled can express a functional H-2 antigen that can then be used to map serological and CTL determinants to specific domains.
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4133
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Liu L. Social security problems in western European countries. SOCIAL SECURITY BULLETIN 1984; 47:17-22. [PMID: 6701727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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4134
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Liu L, Layer PG. Spatio-temporal patterns of differentiation of whole heads of the embryonic chick as revealed by binding of a FITC-coupled peanut-agglutinin (FITC-PNA). Brain Res 1984; 314:173-82. [PMID: 6423214 DOI: 10.1016/0165-3806(84)90040-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The spatio-temporal expression of specific binding sites for FITC-labeled peanut agglutinin (Arachis hypogaea) in frozen sections of whole embryonic heads of the chick between embryonic day 2 (E2) and embryonic day 8 (E8) is described. PNA-binding sites are present already at E2 on the external limiting membrane and the ventricular boundary of the neural wall. With progressing differentiation fluorescent bands are formed from the outside of the neural wall radiating inside, forming second layers inside the CNS at later stages. The visual system (retina and tectum) shows remarkably little PNA-binding activity until about E7/8, a time when binding sites in the other brain areas are already most abundant. In the telencephalon a fuzzy distribution of fluorescence is found. A possible significance of this finding for fiber guidance from the retina to the tectum is briefly discussed. Local high activities can be observed in different parts of the brain. Intense bands of PNA-fluorescence on parts of the epidermis, along the eye cups, around the fore- and hindbrain and in the medial part of the mesenchyme delineate early biochemical compartments foreshadowing the succeeding ossification.
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4135
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Abstract
The first clinically and biochemically documented case of recurrent thyrotoxicosis after I-131 induced hypothyroidism in a patient with Graves' disease is reported. Two months after the administration of 9.2 mCi of I-131, the subject developed hypothyroidism. One month later, the patient became euthyroid. Then, nine months following ablation, the patient again developed thyrotoxicosis. A second dose of I-131 of 12.5 mCi was required to finally produce permanent hypothyroidism. This case illustrates the recurrence of hypothyroidism after what had seemed to have been adequate I-131 radiation.
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4136
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Liu L. Optical-correlation quasi-interferometry: a new viewpoint on spatial frequency filtering. APPLIED OPTICS 1983; 22:3024. [PMID: 18200148 DOI: 10.1364/ao.22.003024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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4137
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Liu L. Color coding in quasi-interferometry. APPLIED OPTICS 1983; 22:3016. [PMID: 18200147 DOI: 10.1364/ao.22.003016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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4138
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Liu L, Layer PG, Gierer A. Binding of FITC-coupled peanut-agglutinin (FITC-PNA) to embryonic chicken retinas reveals developmental spatio-temporal patterns. Brain Res 1983; 284:223-9. [PMID: 6871724 DOI: 10.1016/0165-3806(83)90007-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
FITC-labeled peanut agglutinin (PNA), a lectin from peanut (Arachis hypogaea) which binds specifically to D-galactose, was used as a probe to trace the distribution of PNA-lectin receptors during early development of chick retina. We found that specific fluorescence within the inner plexiform layer (IPL) and the outer plexiform layer (OPL) appears at different developmental stages. The specific fluorescence of the IPL first appears near the central area of the ventro-posterior quadrant of the 7-day retina, then extends progressively towards the periphery, reaching the ora serrata earlier on the posterior than on the anterior side. The development of the specific fluorescence of the OPL follows the same scheme, but it appears later (starting at day 9) than that of the IPL and it is less pronounced. The spatio-temporal patterns of the expression of the lectin receptors show relationships to those of withdrawal of proliferating cells from mitosis, and of other events related to differentiation.
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4139
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Zhou XZ, Shi LY, Liu L, Wang SC, Li HL. [Studies on plasmid of the chuangxinmycin-producing strain. III. Screening of a non-producing mutant, HT52, of the chuangxinmycin-producing strain and identification of the plasmid by nitrocellulose membrane filters hybridization]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1983; 5:165-8. [PMID: 6226412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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4140
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Abstract
In brief: The patient in this case report engaged in severe and prolonged exercise (six hours of tennis daily) and suffered bouts of postexercise carpopedal spasm. She was found to have Hypomagnesemia. After receiving magnesium supplements, her symptoms abated and serum magnesium normalized.
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4141
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Liu L, Jaffe R, Borowski GD, Rose LI. Exacerbation of Cushing's disease during pregnancy. Am J Obstet Gynecol 1983; 145:110-1. [PMID: 6849338 DOI: 10.1016/0002-9378(83)90351-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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4142
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Liu L. Optical biasing on quasi-interferometry with coded correlation filtering. APPLIED OPTICS 1982; 21:3839-3845. [PMID: 20396328 DOI: 10.1364/ao.21.003839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A new method for optical biasing is developed to improve the performance of quasi-interferometry with coded correlation filtering. First, by defocusing a mask, a quadratic phase factor is added to the object under test; this yields background fringes. Second, a linear phase factor is introduced by off-axis shifting of masks. The formulas describing these two effects are derived for various possible configurations. The condition of invariance is discussed. Simplified systems are also studied to obtain continuous changing of sensitivity independent of quadratic phase biasing. Some experiments and applications are illustrated.
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4143
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Liu L, Haskin ME, Rose LI, Bemis CE. Diagnosis of bilateral adrenocortical hemorrhage by computed tomography. Ann Intern Med 1982; 97:720-1. [PMID: 7137737 DOI: 10.7326/0003-4819-97-5-720] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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4144
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Liu L. Quasi-interferometry with coded correlation filtering. APPLIED OPTICS 1982; 21:2817-2826. [PMID: 20396124 DOI: 10.1364/ao.21.002817] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A new kind of principle is proposed to measure distorted transparent objects and specular surfaces directly. The method is based on correlation filtering of the object under study with two coded masks in noncoherent Fourier transformation. The information about the phase gradient appears in the form of fringes. The systems are analyzed mathematically. The following properties are shown: The systems can perform in real time and with an extended white light illumination. The various information can be obtained by using different masks. The sensitivity is relatively low and can be altered, marked, continuously varied, and even graded into several sections of different values. Some experiments and possible applications are shown.
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4145
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Xia SH, Liu L, Qiu FZ. [Surgical anatomy of the liver hilus]. ACTA ACADEMIAE MEDICINAE WUHAN = WU-HAN I HSUEH YUAN HSUEH PAO 1982; 2:25-33. [PMID: 7170083 DOI: 10.1007/bf02858847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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4146
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Ammon HL, Mazzocchi PH, Liu L, Colicelli EC, Doherty R, Stewart JM. The structures of five bicyclic lactams: 2-benzyl-3-oxo-2-azabicyclo[2.2.1]hept-6-exo-yl p-toluenesulfonate, 2-benzyl-6-exo-phenoxy-2-azabicyclo[2.2.1]heptan-3-one, 2-benzyl-6-exo-(2-iodo-4-methylphenoxy)-2-azabicyclo[2.2.1]heptan-3-one, 2-benzyl-6-exo-(2,6-diiodo-4-methylphenoxy)-2-azabicyclo[2.2.1]heptan-3-one and 2-benzyl-6-exo-phenoxy-2-azabicyclo[2.2.2]octan-3-one. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 1982. [DOI: 10.1107/s0567740882003343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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4147
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Liu L. [Axoplasmic transport (author's transl)]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1982; 13:77-80. [PMID: 6179157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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4148
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Chen ZZ, Liu L, Zhou TJ, Li QA, Wang HX. [Effect of Asarum heterotropoides on the left ventricular function of dogs (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:721-7. [PMID: 7336932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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4149
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Mehrotra SN, Liu L, Srivastava JR, Singh SB. Evaluation of various methods in treatment of enuresis. Indian Pediatr 1980; 17:519-22. [PMID: 7216401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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4150
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