251
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Liu J, Zhai Y, Du H. [Quality criteria for bazhen shennongyin liquor]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1997; 22:28-31, 61. [PMID: 10683907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Radix Angelicae Sinensis, Radix Paeoniae Alba and Radix et Rhizoma Rhei in Bazhen Shengnongyin Liquor were identified by TLC. The contents of ginsenoside Rb1 in the preparation was determined by TLCS. Simple, accurate and reproducible, this method could be used as the quality criteria for this preparation.
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252
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Du H, Clarke AE, Bacic A. Arabinogalactan-proteins: a class of extracellular matrix proteoglycans involved in plant growth and development. Trends Cell Biol 1996; 6:411-4. [PMID: 15157509 DOI: 10.1016/s0962-8924(96)20036-4] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Arabinogalactanproteins (AGPs) are proteoglycans of the extracellular matrix o f most plants. Since the late 1980s, AGPs have attracted widespread attention from plant biologists following reports of their involvement in plant development. In particular, the use of monoclonal antibodies to carbohydrate epitopes of AGPs has demonstrated stage- and tissue-specificity and has led to suggestions that they are involved in tissue morphogenesis. The recent cloning of the genes for several AGP protein backbones allows us to consider new strategies to address their function. Here, we summarize our knowledge of AGPs and consider parallels with animal proteoglycans as a possible framework for future work.
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253
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Du H, Orii R, Yamada Y, Hayashida M, Kin N, Suwa K, Hanaoka K, Hayashita M. Pancuronium increases pulmonary arterial pressure in lung injury. Br J Anaesth 1996; 77:526-9. [PMID: 8942341 DOI: 10.1093/bja/77.4.526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
We studied 25 mongrel dogs who were anaesthetized and their lungs ventilated for investigation of the effects of pancuronium on pulmonary arterial pressure (PAP) in the normal lung, in oleic acid-induced lung injury and in lung injury with hypoxaemia. In the normal lung, PAP was not affected by pancuronium. During lung injury, however, PAP was increased from 21.5 (SD 2.8) to 24.6 (4.2) mm Hg (P < 0.01) and from 22.0 (4.2) to 27.0 (5.8) mm Hg (P < 0.01) after pancuronium 0.08 mg kg-1 and 0.16 mg kg-1, respectively, and from 26.0 (2.9) to 37.1 (3.1) mm Hg after pancuronium 0.16 mg kg-1 when hypoxaemia was present (P < 0.01). The increase in PAP induced by pancuronium was associated with increases in cardiac output and pulmonary vascular resistance. Pretreatment with phentolamine attenuated the pancuronium-induced increase in PAP. The increase in PAP induced by pancuronium was also reduced by vagotomy. If these results in dogs are relevant clinically, then pancuronium should be avoided as a neuromuscular blocker in lung injury.
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254
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Du H, Witte DP, Grabowski GA. Tissue and cellular specific expression of murine lysosomal acid lipase mRNA and protein. J Lipid Res 1996; 37:937-49. [PMID: 8725147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Lysosomal acid lipase (LAL) is essential to the intracellular control of cholesterol and triglyceride catabolism via the low density lipoprotein (LDL) delivery of these neutral lipids to the lysosome. Deficiency of LAL in humans leads to Wolman disease and cholesteryl ester storage disease that result, respectively, in the intralysosomal storage of both neutral lipids or only cholesteryl esters. The mouse and human LAL cDNAs were cloned. The deduced amino acid sequences from the mouse and human LAL had high similarity (95%) and identity (75%) including conservation of the active center motifs (G-X-S-X-G) and five potential N-glycosylation consensus sequences. Tissue specific expression of LAL mRNA and protein in mouse tissues was evaluated by in situ hybridization and immunofluorescence staining, respectively. The LAL mRNA was expressed at low levels in most tissues. High level expression was found in hepatocytes and splenic and thymic cells. Very high level expression was observed in cells of the small intestinal villi, the zona fasciculata and reticularis of the adrenal cortex, pancreatic acini, and renal tubular epithelium. Significant levels of expression were detected in epithelial cells of choroid plexus in developing mouse embryo by day 12, in liver and lung by day 14, and in small intestine and kidney by day 16. Similar distribution of LAL protein was observed by immunofluorescence stain. Our results show that the expression of LAL is regulated in a tissue- and cell-specific manner that corresponds to the pathologic involvement in Wolman disease.-Du, H., D. P. Witte, and G. A. Grabowski. Tissue and cellular specific expression of murine lysosomal acid lipase mRNA and protein.
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255
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Du H, Witte DP, Grabowski GA. Tissue and cellular specific expression of murine lysosomal acid lipase mRNA and protein. J Lipid Res 1996. [DOI: 10.1016/s0022-2275(20)42005-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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256
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Du H, Simpson RJ, Clarke AE, Bacic A. Molecular characterization of a stigma-specific gene encoding an arabinogalactan-protein (AGP) from Nicotiana alata. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 1996; 9:313-23. [PMID: 8919909 DOI: 10.1046/j.1365-313x.1996.09030313.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Arabinogalactan-proteins (AGPs) were isolated from the pistils of Nicotiana alata, deglycosylated, and the protein backbones fractionated by reversed-phase HPLC as previously reported. A major fraction, RT35 was isolated and peptide sequences were obtained after protease digestion. A gene-specific degenerate oligonucleotide was designed according to the amino acid sequences and a 380 bp PCR fragment was amplified in vitro from pistil RNA. The PCR fragment was used to screen a pistil cDNA library and a 762 bp cDNA clone (AGPNa3) was isolated and sequenced. The AGPNa3 cDNA encodes a 169 amino acid protein which consists of three domains: an N-terminal secretion signal, a Pro-rich domain and a C-terminal Cys-rich domain. The mature protein has 145 amino acid residues (16.7 kDa) and a predicted pl of 7.5. Northern blot analyses showed that the AGPNa3 gene was only expressed in the pistils of N. alata and of closely related Nicotiana species but not in other plants or suspension-cultured cells. Further Northern blot analysis and in situ hybridization showed that within the pistil, it was primarily expressed in the stigmatic tissues of mature flowers.
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257
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Abstract
The mec-5 and mec-9 genes encode putative extracellular proteins that allow a set of six touch receptor neurons in C. elegans to respond to gentle touch. MEC-5 is a collagen made by the epidermal cells that surround the touch cells. Mutations causing touch insensitivity affect the Gly-X-Y repeats of this collagen. mec-9 produces two transcripts, the larger of which is expressed in the touch cells and two PVD neurons. This transcript encodes a protein with 5 Kunitz-type protease inhibitor domains, 6 EGF-like repeats (2 of the Ca(2+)-binding type), and a glutamic acid-rich region. Missense mutations causing touch insensitivity affect both the EGF-like and Kunitz domains. Since mec-9 loss of function mutations dominantly enhance the touch insensitive phenotype of several mec-5 mutations, MEC-5 and MEC-9 may interact. We propose that these proteins provide an extracellular attachment point for the mechanosensory channels of the touch cells.
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MESH Headings
- Amino Acid Sequence
- Animals
- Base Sequence
- Caenorhabditis elegans/genetics
- Caenorhabditis elegans/physiology
- Caenorhabditis elegans Proteins
- Collagen/genetics
- Collagen/physiology
- Epistasis, Genetic
- Extracellular Matrix/physiology
- Extracellular Matrix Proteins/chemistry
- Extracellular Matrix Proteins/genetics
- Extracellular Matrix Proteins/physiology
- Fluorescent Dyes
- Genes, Helminth
- Genes, Recessive
- Genes, Reporter
- Helminth Proteins/chemistry
- Helminth Proteins/genetics
- Helminth Proteins/physiology
- Mechanoreceptors/physiology
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Neurons, Afferent/chemistry
- Neurons, Afferent/physiology
- Protein Structure, Tertiary
- Recombinant Fusion Proteins/analysis
- Repetitive Sequences, Nucleic Acid
- Sequence Alignment
- Sequence Homology, Amino Acid
- Touch/physiology
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258
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Bacic A, Du H, Stone BA, Clarke AE. Arabinogalactan proteins: a family of cell-surface and extracellular matrix plant proteoglycans. Essays Biochem 1996; 31:91-101. [PMID: 9078460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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259
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Sheriff S, Du H, Grabowski GA. Characterization of lysosomal acid lipase by site-directed mutagenesis and heterologous expression. J Biol Chem 1995; 270:27766-72. [PMID: 7499245 DOI: 10.1074/jbc.270.46.27766] [Citation(s) in RCA: 104] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Lysosomal acid lipase (LAL) is essential for the hydrolysis of cholesterol esters and triglycerides that are delivered to the lysosomes via the low density lipoprotein receptor system. The deficiency of LAL is associated with cholesteryl ester storage disease (CESD) and Wolman's disease (WD). We cloned the human LAL cDNA and expressed the active enzyme in the baculovirus system. Two molecular forms (M(r) approximately 41,000 and approximately 46,000) with different glycosylation were found intracellularly, and approximately 24% of the M(r) approximately 46,000 form was secreted into the medium. Tunicamycin treatment produced only an inactive M(r) approximately 41,000 form. This result implicates glycosylation occupancy in the proper folding for active-site function. Catalytic activity was greater toward cis- than trans-unsaturated fatty acid esters of 4-methylumbelliferone and toward esters with 7-carbon length acyl chains. LAL cleaved cholesterol esters and mono-, tri-, and diglycerides. Heparin had a biphasic effect on enzymatic activity with initial activation followed by inhibition. Inhibition of LAL activity by tetrahydrolipstatin and diethyl p-nitrophenyl phosphate suggested the presence of active serines in binding/catalytic domain(s) of the protein. Site-directed mutagenesis at two putative active centers, GXSXG, showed that Ser153 was important to catalytic activity, whereas Ser99 was not and neither was the catalytic nucleophile. Three reported mutations (L179P, L336P, and delta AG302 deletion) from CESD patients were created and expressed in the Sf9 cell system. None cleaved cholesterol esters, and L179P and L336P cleaved only triolein at approximately 4% of wild-type levels. These results suggest that mechanisms, in addition to LAL defects, may operate in the selective accumulation of cholesterol esters or triglycerides in CESD and WD patients.
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260
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Liu KJ, Bacic G, Hoopes PJ, Jiang J, Du H, Ou LC, Dunn JF, Swartz HM. Assessment of cerebral pO2 by EPR oximetry in rodents: effects of anesthesia, ischemia, and breathing gas. Brain Res 1995; 685:91-8. [PMID: 7583257 DOI: 10.1016/0006-8993(95)00413-k] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This report describes experiments designed to assess and illustrate the effectiveness of a new method for the measurement of cerebral interstitial pO2 in conscious rodents. It is based on the use of low frequency electron paramagnetic resonance (EPR) spectroscopy with lithium phthalocyanine as the oxygen sensitive probe. Magnetic resonance imaging was used to document placement of the probe in the brain, and to assess potential cerebral changes associated with the placement. The technique provided accurate and reproducible measurements of localized pO2 in the brains of conscious rodents under a variety of physiological conditions and for time periods of at least 2 weeks. Using this approach we quantitated the depressing effects on cerebral pO2 of three representative anesthetics, isoflurane, ketamine/xylazine, and sodium pentobarbital. The effects of changing the content of oxygen in the breathing gas was investigated and found to change the cerebral pO2. In experiments with gerbils, crystals of lithium phthalocyanine were implanted in each side of the brain and using a one-dimensional magnetic field gradient, simultaneous measurement of pO2 values from normal and ischemic (ischemia induced by unilateral ligation of a carotid artery) hemispheres of the brain were obtained. These results demonstrate that EPR oximetry with lithium phthalocyanine is a versatile and useful method in the measurement of cerebral pO2 under various physiological and pathophysiological conditions.
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261
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Gao X, Tang X, Du H, Li B. A clinical and neuroelectrophysiological study of hyperkalemic periodic paralysis. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 1995; 10:116-118. [PMID: 7647318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A case of atypical hyperkalemic periodic paralysis is reported. The diagnosis was confirmed by hyperkalemic test, cold water test, and differentiation of attack period and rest period by the measurement of motor nerve conduction amplitude. Etio-pathology of this disease is discussed from the view of neuroelectrophysiology.
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262
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Du H, Simpson RJ, Moritz RL, Clarke AE, Bacic A. Isolation of the protein backbone of an arabinogalactan-protein from the styles of Nicotiana alata and characterization of a corresponding cDNA. THE PLANT CELL 1994; 6:1643-53. [PMID: 7827496 PMCID: PMC160550 DOI: 10.1105/tpc.6.11.1643] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Arabinogalactan-proteins (AGPs) from the styles of Nicotiana alata were isolated by ion exchange and gel filtration chromatography. After deglycosylation by anhydrous hydrogen fluoride, the protein backbones were fractionated by reversed-phase HPLC. One of the protein backbones, containing mainly hydroxyproline, alanine, and serine residues (53% of total residues), was digested with proteases, and the peptides were isolated and sequenced. This sequence information allowed the cloning of a 712-bp cDNA, AGPNa1. AGPNa1 encodes a 132-amino acid protein with three domains: an N-terminal secretion signal sequence, which is cleaved from the mature protein; a central sequence, which contains most of the hydroxyproline/proline residues; and a C-terminal hydrophobic region. AGPNa1 is expressed in many tissues of N. alata and related species. The arrangement of domains and amino acid composition of the AGP encoded by AGPNa1 are similar to that of an AGP from pear cell suspension culture filtrate, although the only sequence identity is at the N termini of the mature proteins.
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263
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Dong FT, Zhang CF, Du H. [Surgical removal of macular epiretinal membrane]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1994; 30:338-40. [PMID: 7805533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Vitreous surgery was used to remove macular epiretinal membranes in 15 eyes of 15 cases of which 7 were idiopathic and 8 secondary. In the period of postoperative follow-up, the visual acuity improved in 14 eyes (93%), in which 57% improved 3 or more than 3 lines. The visual recovery is related to the time of operation chosen. No complication was noted, except development of a paracentral scotoma in 1 eye.
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264
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Dodds PN, Bönig I, Du H, Rödin J, Anderson MA, Newbigin E, Clarke AE. S-RNase gene of Nicotiana alata is expressed in developing pollen. THE PLANT CELL 1993; 5:1771-82. [PMID: 8305871 PMCID: PMC160403 DOI: 10.1105/tpc.5.12.1771] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In the solanaceous plant Nicotiana alata, self-incompatibility is controlled by a single, multiallelic locus (S locus) expressed in both pollen and pistil. Previously, we have shown cosegregation between alleles of the S locus and alleles of a gene that encodes a glycoprotein with ribonuclease activity (S-RNase). Furthermore, expression of the S-RNase gene is apparently confined to the pistil and is correlated with the onset of self-incompatibility. In this paper, we report that the S-RNase gene is also expressed at low levels in developing pollen. A transcript in developing pollen hybridized to a cDNA encoding the S2-RNase allele of the parent plant and did not hybridize to cDNAs encoding other S-RNase alleles. Two cDNAs for the S2-RNase were cloned from a library derived from anthers of a plant homozygous for the S2 allele and both corresponded to the coding sequence of the S2-RNase. The product of the S-RNase gene was detected by immunocytochemistry in the intine of mature, hydrated pollen grains. These results are interpreted in the light of current knowledge of the structure of the S locus.
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265
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Mitani S, Du H, Hall DH, Driscoll M, Chalfie M. Combinatorial control of touch receptor neuron expression in Caenorhabditis elegans. Development 1993; 119:773-83. [PMID: 8187641 DOI: 10.1242/dev.119.3.773] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Six touch receptor neurons with distinctive morphological features sense gentle touch in Caenorhabditis elegans. Previous studies have identified three genes (lin-32, unc-86 and mec-3) that regulate touch cell development. However, since other cell types also require these genes, we suspected that other genes help restrict the expression of touch cell characteristics to the six neurons seen in the wild type. To identify such genes, we have examined mutants defective in genes required for the development of other C. elegans cells for changes in the pattern of touch cell-specific features. Mutations in seven genes either reduce (lin-14) or increase (lin-4, egl-44, egl-46, sem-4, ced-3 and ced-4) the number of touch receptor-like cells. The combinatorial action of these genes, all of which are required for the production of many cell types, restrict the number of cells expressing touch receptor characteristics in wild-type animals by acting as positive and negative regulators and by removing cells by programmed cell death.
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266
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Zhang CF, Fei PF, Dong FT, Du H, Sun YM. Endolaser photocoagulation after vitrectomy on rabbit's eyes. Chin Med J (Engl) 1993; 106:538-41. [PMID: 8243127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Ophthalmoscopic and histopathologic studies of endolaser photocoagulation after vitrectomy were carried out on rabbit's eyes. The endoprobe was connected to the Coherent "Novus 2,000" argon laser system. Under appropriate application the grayish white retinal lesions produced by argon green and argon all wavelength endolaser photocoagulation were similar ophthalmoscopically at a treatment power of 80-100 mw and exposure duration of 0.2s. Histopathologically, the characteristic changes of the retinal lesions produced by argon all wave-length were more significant than that produced by argon green endolaser photocoagulation. Scattered retinal photocoagulation can be done when the opaque medium is cleared on the operating table.
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267
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McClure BA, Du H, Liu YH, Clarke AE. S-locus products in Nicotiana alata pistils are subject to organ-specific post-transcriptional processing but not post-translational processing. PLANT MOLECULAR BIOLOGY 1993; 22:177-81. [PMID: 8098964 DOI: 10.1007/bf00039008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The expression of genes encoding self-incompatibility ribonucleases (S-RNases) in Nicotiana alata were examined at both protein and RNA level for organ specificity. S-RNases recovered from stigmas and styles were indistinguishable by SDS-PAGE, chromatographic behaviour and RNase specific activity. The pistil S transcripts are heterogeneous in size, the stigma transcript being shorter and more heterogeneous than the transcripts in the style and ovary. RNase H analysis shows that this organ-specific difference is mainly in the length of the polyadenylate tail. By sequence analysis of cloned cDNAs we show that the transcript present in the stigma is derived from the same gene as the transcript in the style.
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268
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Du H, Roy AL, Roeder RG. Human transcription factor USF stimulates transcription through the initiator elements of the HIV-1 and the Ad-ML promoters. EMBO J 1993; 12:501-11. [PMID: 8440240 PMCID: PMC413233 DOI: 10.1002/j.1460-2075.1993.tb05682.x] [Citation(s) in RCA: 144] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Earlier in vitro studies identified USF as a cellular factor which activates the adenovirus major late (Ad-ML) promoter by binding to an E-box motif located at position -60 with respect to the cap site. Purified USF contains 44 and 43 kDa polypeptides, and the latter was found (by cDNA cloning) to be a helix-loop-helix protein. In this report, we demonstrate a 25-to 30-fold stimulation of transcription via an upstream binding site by ectopic expression of the 43 kDa form of USF (USF43) in transient transfection assays. More recent data have also revealed alternate interactions of USF43 at pyrimidine-rich (consensus YYAYTCYY) initiator (Inr) elements present in a variety of core promoters. In agreement with this observation, we show here that USF43 can recognize the initiator elements of the HIV-1 promoter, as well as those in the Ad-ML promoter, and that ectopic expression of USF43 can stimulate markedly the corresponding core promoters (TATA and initiator elements) when analyzed in transient co-transfection assays. Mutations in either Inr 1 or Inr 2 reduced the USF43-dependent transcription activity in vivo. In addition, in vitro transcription assays showed that mutations in either or both of the Inr 1 and Inr 2 sequences of the HIV-1 and Ad-ML promoters could affect transcription efficiency, but not the position of the transcriptional start site. These results indicate that USF43 can stimulate transcription through initiator elements in two viral promoters, although the exact mechanism and physiological significance of this effect remain unclear.
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269
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Du H, Zhao X, Liu G, Liu F. [Quality of dihuang (Rehmannia spp.)]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1992; 17:327-9, 381. [PMID: 1418572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In this paper, the contents of catalpol, water-extract and alcohol-extract materials, ash, total reducing sugar and inorganic elements in Dihuang from different habitats have been measured. The result shows that Huai Dihuang, the genuine drug, excels all those from other habitats in quality. The quality of commercial dry Dihuang may be related closely to the production area, storage time, etc.
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270
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Zhang CF, Zhu XH, Dong FT, Ye JJ, Fei PF, Zhang QN, Du H. A clinical study on diabetic retinopathy. Chin Med J (Engl) 1992; 105:234-6. [PMID: 1395843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
A clinical research on the diabetic retinopathy(DR) is reported. In the 662 cases of diabetes mellitus examined, the prevalence of DR was 51.3%, of which 7.6% were preproliferative and 7% proliferative. The study showed that when the disease progressed to the preproliferative and proliferative DR, laser photocoagulation could be the best treatment of choice, and panretinal photocoagulation was also quite effective in the treatment of pregnant patients with proliferative diabetic retinopathy.
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271
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Drew J, Liodakis A, Chan R, Du H, Sadek M, Brownlee R, Sawyer WH. Preparation of lipid emulsions by pressure extrusion. BIOCHEMISTRY INTERNATIONAL 1990; 22:983-92. [PMID: 2090110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Lipid emulsions consisting of a surface monolayer of phospholipid enclosing a core of neutral lipids have been prepared by repeated extrusion through polycarbonate filters of defined pore size. Particle size, as measured by photon correlation spectroscopy, decreases on successive passes through a 100 nm filter, reaching a near constant value (130-150 nm) after 4 passes. A corresponding decrease in the standard deviation of the particle size distribution occurs during this process. The recovery of lipids, especially of cholesterol and cholesterol ester, is improved if the emulsion is sonicated before extrusion through filters. [31P]-NMR and fluorescence techniques are used to confirm that the resulting structures are emulsions rather than lipid bilayers.
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272
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Du H. [A hemodynamic study of coronary artery disease patients under external counterpulsation]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1990; 18:175-6. [PMID: 2086173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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273
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Du H, Qian Z, Wang Z. [Prevention of radiation injury of the lungs by Salvia miltiorrhiza in mice]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1990; 10:230-1, 198. [PMID: 2401036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The lungs and thymus of mice received X-ray irradiation on the right thorax were observed. It was found that lung injury was lighter and got recovered more rapidly in mice given Salvia miltiorrhiza than that in the control group. Microscopic thymus changes showed no difference in the two groups. The results indicated that Salvia miltiorrhiza could prevent radiation-induced pulmonary injury, but could not prevent thymus injury.
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274
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Dermody JJ, Wojcik BE, Du H, Ozer HL. Identification of temperature-sensitive DNA- mutants of Chinese hamster cells affected in cellular and viral DNA synthesis. Mol Cell Biol 1986; 6:4594-601. [PMID: 3796611 PMCID: PMC367244 DOI: 10.1128/mcb.6.12.4594-4601.1986] [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: 01/07/2023] Open
Abstract
We described a strategy which facilitates the identification of cell mutants which are restricted in DNA synthesis in a temperature-dependent manner. A collection of over 200 cell mutants temperature-sensitive for growth was isolated in established Chinese hamster cell lines (CHO and V79) by a variety of selective and nonselective techniques. Approximately 10% of these mutants were identified as ts DNA- based on differential inhibition of macromolecular synthesis at the restrictive temperature (39 degrees C) as assessed by incorporation of [3H]thymidine and [35S]methionine. Nine such mutants, selected for further study, demonstrated rapid shutoff of DNA replication at 39 degrees C. Infections with two classes of DNA viruses extensively dependent on host-cell functions for their replication were used to distinguish defects in DNA synthesis itself from those predominantly affecting other aspects of DNA replication. All cell mutants supported human adenovirus type 2 (Ad2) and mouse polyomavirus DNA synthesis at the permissive temperature. Five of the nine mutants (JB3-B, JB3-O, JB7-K, JB8-D, and JB11-J) restricted polyomavirus DNA replication upon transfection with viral sequences at 33 degrees C and subsequent shift to 39 degrees C either before or after the onset of viral DNA synthesis. Only one of these mutants (JB3-B) also restricted Ad2 DNA synthesis after virion infection under comparable conditions. No mutant was both restrictive for Ad2 and permissive for polyomavirus DNA synthesis at 39 degrees C. The differential effect of these cell mutants on viral DNA synthesis is expected to assist subsequent definition of the biochemical defect responsible.
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