6576
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Siegel BZ, Siegel SM, Chen J, LaRock P. An extraterrestrial habitat on Earth: the algal mat of Don Juan [correction of Jaun] Pond. ADVANCES IN SPACE RESEARCH : THE OFFICIAL JOURNAL OF THE COMMITTEE ON SPACE RESEARCH (COSPAR) 1983; 3:39-42. [PMID: 11542753 DOI: 10.1016/0273-1177(83)90171-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
On the edge of Don Juan Pond in the Wright Valley of Antarctica lies a mat of mineral and detritus cemented by organic matter. In spite of a CaCl2 concentration of about 33% (w/v), the mat contains Oscillatoria and other cyanobacteria, unicellular forms, colonial forms rich in carotenoids, and diatoms. Bacteria are rare; fungal filaments are not. Oscillatoria showed motility but only at temperatures <10 degrees C. Acetone extracts of the mat and nearby muds yielded visible spectra similar to those of laboratory grown O. sancta, with 50- to 70-fold molar ratio of chlorophyll a to b. Although rare, tardigrades were also found. The algal mat had enzymatic activities characteristic of peroxidase, catalase, dehydrogenase, and amylase. Cellulose, chitin, protein, lipid and ATP were present. Previously, algae in the Wright Valley have been described in melt water, not in the brine itself. Wright Valley has been used as a near sterile Martian model. It obviously contains an array of hardy terrestrial organisms.
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6577
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Chen J. [The darkroom-and-prone test]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1983; 19:1-3. [PMID: 6406183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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6578
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Peng SY, Yue MK, Qi VJ, Chen J. Aspects of treatment at the Zhejiang Medical College, China. An operation for recurrent pigment gallstones--subcutaneous choledocho-jejunostomy. Ann R Coll Surg Engl 1983; 65:50-1. [PMID: 6824301 PMCID: PMC2494207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
In China recurrent pigment gall stones are common and may cause acute obstructive suppurative cholangitis. A partial solution to this problem is the creation of a new anatomical arrangement whereby recurrent gall stones can be easily and safely removed.
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6579
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Peng SY, Yue MK, Qi VJ, Chen J. Aspects of treatment at the Zhejiang Medical College, China. Pedicle auto-transplantation of the adrenal gland in the treatment of Cushing's syndrome. Ann R Coll Surg Engl 1983; 65:51. [PMID: 6824302 PMCID: PMC2494231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Cushing's syndrome due to hyperplasia of the adrenal cortex can be treated by total adrenalectomy with one of the adrenal glands transplanted with a vascular pedicle to an easily accessible site. If the symptoms persist or recur after the operation, superfluous transplanted gland can be partially resected under local anaesthesia.
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6580
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Abstract
Giant pulse Q-switched operation of a cone-mirror resonator has been performed. Measurement of the conventional output energy vs resonator length was obtained. The damage level of the dye cell's location is discussed. With some optimization and careful engineering, cone-mirror resonators have valuable advantages.
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6581
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Chen J, Dong D, Andrade J. Effect of reductive methylation on the adsorption of hen lysozyme. J Colloid Interface Sci 1982. [DOI: 10.1016/0021-9797(82)90212-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6582
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Du RY, Wang XH, Huang CT, Chen J. Alteration of blood dopamine-beta-hydroxylase activity in patients with intrahepatic portal hypertension. Chin Med J (Engl) 1982; 95:737-40. [PMID: 6817977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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6583
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Chen J, Kow C, Fetters LJ, Plazek DJ. Some evidence against the existence of the liquid-liquid transition. III. The evaluation of the Tll event by differential scanning calorimetry. ACTA ACUST UNITED AC 1982. [DOI: 10.1002/pol.1982.180200905] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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6584
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Abstract
A 67-year-old man with adenocarcinoma of the colon had recurrent pulmonary emboli. The patient's level of serum antithrombin III was found to be below normal. Heparin therapy led to further reduction, resulting in failure of adequate anticoagulation. The patient subsequently died of massive pulmonary emboli despite heparin therapy. We believe the antithrombin III level should be routinely determined for patients receiving heparin therapy.
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6585
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Siegel D, Strosberg JM, Wiese F, Chen J. Acne fulminans with a lytic bone lesion responsive to dapsone. J Rheumatol 1982; 9:344-6. [PMID: 6212679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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6586
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Chen J, Goetchius MP, Combs GF, Campbell TC. Effects of dietary selenium and vitamin E on covalent binding of aflatoxin to chick liver cell macromolecules. J Nutr 1982; 112:350-5. [PMID: 6173473 DOI: 10.1093/jn/112.2.350] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Day-old single comb white Leghorn chicks of both sexes maternally depleted in selenium (Se) and vitamin E (VE) were fed a low Se and VE-free semipurified basal diet or that diet supplemented with graded levels of Se (0.2 - 20.0 ppm as Na2SeO3) of VE (100 IU/g as all-rac-alpha-tocopheryl acetate), or both. At 14 days of age, chicks were given 1 mg/kg [3H] aflatoxin B1 (AFB1) i.p. and killed either 2 or 24 hours later. Covalent binding of AFB1 to liver DNA and RNA in chicks fed the basal diet was significantly greater than in chicks supplemented with Se or VE, or both. Phenobarbital treatment prior to administration of AFB1 decreased adduct formation in most groups, and abolished differences in adduct formation due to diet. These results suggest that combined Se-VE deficiency enhances activation or inhibits detoxification of AFB1 in vivo.
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6587
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Chen J, Goetchius MP, Campbell TC, Combs GF. Effects of dietary selenium and vitamin E on hepatic mixed-function oxidase activities and in vivo covalent binding of aflatoxin B1 in rats. J Nutr 1982; 112:324-31. [PMID: 6799626 DOI: 10.1093/jn/112.2.324] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Male weanling fischer-344 rats were fed a selenium (Se)-vitamin E (VE) deficient Torula yeast basal diet or that diet supplemented with a graded levels of SE (0.2-6.0 ppm as Na2SeO3) or VE (100 iu/kg as all-rac-2-tocopheryl acetate), or both, for 4 or 6 weeks. Se deficiency and excess (6.0 ppm) markedly depressed in vivo covalent binding of aflatoxin (AFB1) to macromolecules in livers of rats killed 2 hours after an i.p. dose of 1 mg/kg tritiated AFB1. VE supplementation had no effect. Prior phenobarbital (PB) treatment generally decreased adducts without changing diet-related trends. Some hepatic enzyme capabilities were also measured. Cytochrome b5 content and cytochrome c reductase activity were unaffected by diet. VE increased cytochrome P-450 content, ethylmorphine N-demethylase and benz(alpha)pyrene hydroxylase activities; all these were unaffected by Se levels. Se deficiency and excess (but not VE deficiency) increased glucuronyl transferase. PB induction affected all diet groups and was more in agreement with MFO activity than transferase. Adduct formation was more consistently related to transferase activity than to MFO activities. The contrasting effects of SE and VE on AFB1 adducts in rats and chicks are discussed.
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6588
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Abstract
This work examines the dynamic surface pressure-area behavior of films of unconjugated bilirubin spread from chloroform solution at 22 degrees C on 0.15 M NaCl and buffered phosphate subphases. Film behavior is examined at pH 5.5, 7.4 and 8.0. The interactions of bilirubin in mixed films with dipalmitoyl phosphatidylcholine and with 9:1 dipalmitoyl phosphatidylcholine:dioleolyl phosphatidylcholine are examined at similar temperature and pH values. It is found that unconjugated bilirubin modifies the dynamic surface pressure-area behavior of phospholipid films in both the high and low surface pressure regimes, with bilirubin exerting its greatest effect at low pH where its subphase solubility is low. Because many premature infants suffering from the Respiratory Distress Syndrome (RDS) have accompanying hyperbilirubinemia, with possible bilirubin transport to the alveolar space, the interactions of bilirubin with phospholipid films are discussed in terms of potential effects on pulmonary surfactant in vivo.
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6589
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Hanna W, McCarroll D, McDonald T, Painter P, Tuller J, Chen J, Lange R. Variant von Willebrand's disease and pregnancy. Blood 1981; 58:873-9. [PMID: 6794676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The clinical course and coagulation profile of a pregnant patient with variant von Willebrand's disease were followed from the second trimester through puerperium. The clinical course was characterized by a normal delivery and absence of abnormal bleeding or need for replacement therapy. The coagulation profile demonstrated an increase in factor VIII procoagulant activity, factor-VIII-related antigen, and platelet aggregation activity in response to ristocetin prior to delivery. Postpartum, these factors decreased to prepregnancy values with distinctly different patterns. Factor VIII procoagulant activity continued to rise for 5 days after delivery and then decreased with a half-life of approximately 6 days. Factor-VIII-related antigen began to decrease just prior to delivery, displaying a half-life or approximately 6 days. Ristocetin cofactor activity, however, dropped immediately postpartum and displayed a half-life of approximately 6 hr. The ristocetin cofactor activity was associated with factor-VIII-related antigen, which displayed a significantly smaller molecular weight than does normal factor-VIII-related antigen. Larger aggregates of factor-VIII-related antigen. Larger aggregates of factor-VIII-related antigen did not appear during the pregnancy, and ristocetin cofactor activity could not be demonstrated in fragments of less than 0,8 x 10(6).
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6590
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McCarroll D, Trent D, Chen J, Lange R. Adsorption of human factor VIII to barium sulfate. Thromb Haemost 1981; 46:667. [PMID: 6797095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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6591
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Meinke DW, Chen J, Beachy RN. Expression of storage-protein genes during soybean seed development. PLANTA 1981; 153:130-139. [PMID: 24276763 DOI: 10.1007/bf00384094] [Citation(s) in RCA: 92] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/1981] [Accepted: 07/30/1981] [Indexed: 06/02/2023]
Abstract
Mature seeds of Glycine max (L.) Merr. contain two major storage proteins, a glycosylated 7S protein (conglycinin) and a non-glycosylated 11S protein (glycinin). Accumulation of these proteins and their mRNAs during seed development in cv. Provar was studied by SDS polyacrylamide gel electrophoresis and by "Northern" (DNA-RNA) hybridization. The 11S acidic and basic subunits and the 7S α' and α subunits began to accumulate 18-20 d after pollination, shortly after the termination of cell division in developing cotyledons, whereas the 7S β and 11S A-4 subunits were not detected until one to two weeks later, during the maturation phase of development. Messenger RNAs for 7S and 11S proteins were first detected 14-18 d after pollination, several days before the accumulation of storage proteins. Extracts from embryonic axes contained reduced levels of the 7S α subunit, very little 11S protein, no detectable 7S β or 11S A-4 subunits, and an additional 7S subunit not found in cotyledons. Soybean axes and cotyledons therefore differ in their synthesis of seed storage proteins.
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6592
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McCarroll D, Hanna W, Trent D, Chen J. Factors affecting the appearance of a pre-peak during crossed immunoelectrophoresis of factor VIII related antigen. Thromb Res 1981; 23:113-20. [PMID: 6795752 DOI: 10.1016/0049-3848(81)90244-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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6593
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Chen J, Wang XH, Yang JX. [Effects of acupuncture analgesia on dopamine-beta-hydroxylase activity in different brain areas and adrenal glands of the guinea pig]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1981; 3 Suppl 1:69-71. [PMID: 6459884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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6594
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Albers-Schönberg G, Joshua H, Lopez MB, Hensens OD, Springer JP, Chen J, Ostrove S, Hoffman CH, Alberts AW, Patchett AA. Dihydromevinolin, a potent hypocholesterolemic metabolite produced by Aspergillus terreus. J Antibiot (Tokyo) 1981; 34:507-12. [PMID: 7275832 DOI: 10.7164/antibiotics.34.507] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A new, potent hypocholesterolemic agent is produced by cultures of Aspergillus terreus. The isolation of the compound and its characterization as 4a,5-dihydromevinolin containing a trans-fused octahydro-naphthalene system are described. Comparative data for dihydromevinolin and mevinolin in three biological assays are given: in vitro inhibition of HMG-CoA reductase, inhibition of sterol synthesis in cell cultures, and inhibition of cholesterol synthesis in vivo in rats.
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6595
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Chen J, Miller GW, Takemoto JY. Biosynthesis of delta-aminolevulinic acid in Rhodopseudomonas sphaeroides. Arch Biochem Biophys 1981; 208:221-8. [PMID: 6973318 DOI: 10.1016/0003-9861(81)90143-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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6596
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Xu XR, Xu H, Chen J, Tang QM. [Determination of partition coefficient by high-pressure liquid chromatography. III. The comparison of determination of partition coefficient using different kinds of bonded octadecylsilane support (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:177-81. [PMID: 7246167] [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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6597
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6598
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Xu XR, Tang QM, Chen J, Xu H. [Separation of amino acids and amines as diastereoisomers by high performance liquid chromatography (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:127-31. [PMID: 7304179] [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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6599
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Goldstein AL, Low TL, Thurman GB, Zatz MM, Hall N, Chen J, Hu SK, Naylor PB, McClure JE. Current status of thymosin and other hormones of the thymus gland. RECENT PROGRESS IN HORMONE RESEARCH 1981; 37:369-415. [PMID: 7025134 DOI: 10.1016/b978-0-12-571137-1.50012-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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6600
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Lieska N, Chen J, Maisel H, Romero-Herrera AE. Subunit characterization of lens intermediate filaments. BIOCHIMICA ET BIOPHYSICA ACTA 1980; 626:136-53. [PMID: 7459377 DOI: 10.1016/0005-2795(80)90205-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The intermediate filaments from the bovine ocular lens can be fractionated into three 54000 dalton polypeptides (alpha, beta and gamma) which are present in equimolar quantities and differ from one another with respect to isoelectric point, two-dimensional peptide map pattern and total amino acid composition. The polypeptides, for which the name lentin is proposed, were purified from the 8 M urea extract of the water-insoluble residue of the cortical fiber cells by ion-exchange chromatography on DE- and CM-cellulose. The regeneration of native-appearance filaments from each purified fraction, or combinations thereof, definitively established the three polypeptides as the subunit species. Additionally, small diameter 'protofilaments' were regenerated when one or two fractions were utilized, but not when all three fractions were combined. This, together with the fact that the stoichiometric yield of the three species was invariably equimolar, suggests that alpha, beta, and gamma may be distinct entities not related by artifactual interconversion.
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