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31.
32.
光质对一品红叶离体培养中形态发生及生化变化的影响 总被引:3,自引:0,他引:3
本文讨论了将光质应用于一品红(Euphorbia pulcherrima)大规模细胞繁殖及形态发生调控的可行性,并测定了一些形态及生化指标作为这种调控的参数。 以一品红试管苗的叶片作为外植体,置于MS培养基中并分别培养于白(W)、红(R)、黄(Y)、蓝(B)、绿(G)色光及黑暗(D)下,一个月后进行测定。蓝光和黄光明显促进出苗。而愈伤组织形成的情况则正相反,红光利于愈伤组织的形成,黄光效果最差。过氧化物酶、过氧化氢酶活力及蛋白质、RNA、碳水化合物的含量与愈伤组织形成有较为一致的关系,但与分化不直接相关。 实验中还测定了叶绿素a、叶绿素b及类胡萝卜素的含量。白光与蓝光均能促进叶绿素及类胡萝卜素的合成,但蓝光中chl b/chl a的比率较高。此外,本文尚涉及暗处理中的晶质化现象(vitrification)及其成因。 相似文献
33.
The kinematics of an area-conserving tank-treading disk-shaped red blood cell membrane is studied using the stream function
method suggested by Secomb and Skalak (Q. Jl Mech. appl. Math.
35, Pt 2, 233–247, 1982). Two simple area-conserving velocity fields are superimposed to satisfy the continuity condition at
the curved edges of the disk. A differential equation for the trajectory of any material point of the membrane is derived.
The requirement of synchrony of the cycle for all membrane points leads to an integral equation which determines a magnitude
function. An approximate solution is made possible by assuming small trajectory deflections. 相似文献
34.
Lymphocyte-specific Ca2+-binding protein LSP1 is associated with the cytoplasmic face of the plasma membrane. 总被引:2,自引:0,他引:2 下载免费PDF全文
D P Klein J Jongstra-Bilen K Ogryzlo R Chong J Jongstra 《Molecular and cellular biology》1989,9(7):3043-3048
The gene for LSP1 is a lymphocyte-specific gene previously isolated by us using a subtractive hybridization technique. LSP1 mRNA is found in normal and transformed B lymphocytes and in normal T lymphocytes but not in transformed T lymphocytes. To study the expression of the mouse LSP1 protein, we prepared a polyclonal antiserum specific for the LSP1 protein. Here we report that the gene for LSP1 was expressed in transformed B-lymphoma cell lines and in normal mouse thymocytes as a protein doublet with apparent molecular masses of 52 and 50.5 kilodaltons when analyzed on a sodium dodecyl sulfate-10% polyacrylamide gel. BW5147 cells transfected with an LSP1 cDNA clone expressed only the 52-kilodalton protein. No LSP1 protein was expressed in nine T-lymphoma cell lines tested. Immunofluorescence studies of intact and permeabilized cells and subcellular fractionation experiments showed that the LSP1 protein was associated with the cytoplasmic side of the plasma membrane in transformed B-lymphoma cell lines and in normal thymocytes. Using a simple filter-binding assay, we showed that recombinant LSP1 protein was Ca2+ binding, as predicted on the basis of its deduced amino acid sequence. On the basis of the particular expression pattern, the subcellular localization, and the Ca2+-binding property of the LSP1 protein, we hypothesize that the LSP1 protein is a lymphocyte-specific component of a signal transduction pathway involved in the regulation of lymphocyte growth. 相似文献
35.
Calorimetric studies of the effects of cholesterol on the phase transition of C(18):C(10) phosphatidylcholine. 总被引:1,自引:1,他引:0 下载免费PDF全文
Differential scanning calorimetry (DSC) has been employed to study the effects of cholesterol on the phase transition of C(18):C(10) phosphatidylcholine (C(18):C(10)PC). C(18):C(10)PC is an asymmetric mixed-chain phosphatidylcholine known to form mixed-interdigitated structures below the transition temperature and form partially interdigitated lipid bilayers above the transition. Three types of samples were used. The treated sample is the lipid dispersion that had undergone three freeze-thaw cycles and stored at 4 degrees C for more than 48 h. The untreated sample was made by vortexing the dry lipid in 50 mM KCl, without the above-mentioned pretreatment. The cold-treated sample was prepared by incubating the treated sample at -20 degrees C for 15 d. There is no apparent difference in the DSC curves between the treated and cold-treated samples. The data derived from the treated samples seem to be more reproducible. The DSC curves between the cholesterol/C(18):C(10)PC and cholesterol/symmetric diacylphosphatidylcholine mixtures are different in three aspects: overall appearance, the cholesterol dependence of delta H, and the effect of cholesterol on the maximal transition temperature Tm, the onset temperature To, and the completion temperature Tc. for both the treated and untreated samples, the total enthalpy change delta H of the phase transition of C(18):C(10)PC decreases with increasing cholesterol content, approaching zero at approximately 25 mol%. This level is lower than the total enthalpy changes reported previously for the cholesterol/symmetric diacylphosphatidylcholine mixtures. Both the heating and cooling thermograms show that Tm, To, and Tc decrease with increasing cholesterol content. The decreasing rates of these temperatures with cholesterol are in the neighborhood of -0.24 degree per mol% of cholesterol.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
36.
Joel K. Phillips J. Michael Chong John F. Andersen Wendell E. Burkholder 《Entomologia Experimentalis et Applicata》1989,51(2):149-153
The enantiomeric composition of sitophilate, the granary weevil [Sitophilus granarius (L.)] male-produced aggregation pheromone [(R*,S*)-1-ethylpropyl 2-methyl-3-hydroxypentanoate)], was determined by three methods: (1) bioassaying the synthetic (2S,3R) and (2R,3S) enantiomers of the active (R*,S*) diastereomer; (2) 1H NMR spectroscopy of Mosher ester derivatives of the natural pheromone and synthetic (2S,3R)-and (2R,3S)-sitophilate; and (3) capillary GLC comparisons of the retention times of derivatized natural pheromone and the two synthetic enantiomers. The combined methods confirmed the (2S,3R) enantiomer as the active form of sitophilate. Male granary weevils were shown to produce >96% (2S,3R)-sitophilate. No significant attraction of S. granarius by the (2R,3S) enantiomer was observed. Rice and maize weevils [S. oryzae (L.) and S. zeamais Motschulsky] were not attracted by (2S,3R)-sitophilate.
S. granarius L. est un déprédateur important des grains stockés. Le (R*,S*)-1-éthylpropyl 2-méthyl-3-hydroxypentanoate a été identifié en 1987 comme le principal composé du sitophilate, la phéromone mâle d'agrégation de S. granarius. La composition énantiométrique du sitophilate a été déterminée par 3 méthodes:
La combinaison des 3 méthodes confirme que le (2S,3R) énantiomère est la forme active du sitophilate. Le mâle produit >96% de l'énantiomère (2S,3R). Il n'y a pas eu attraction de S. granarius par le (2R,3S) sitophilate. S. oryzae L. et S. zeamais Motsch n'ont pas été attirés par le (2S,3R)-sitophilate. L'utilisation du (2S,3R)-1-éthylpropyl 2-méthyl-3-hydroxypentanoate dans les pièges devrait permettre une détection précoce de la présence de S. granarius dans des stocks de grains. 相似文献
1) | tests biologiques des énantiomères synthétiques (2S,3R) et (2R,3S) du diastéréomère actif (R*,S*); |
2) | spectrométrie RMN 1H des esters Mosher dérivés de la phéromone naturelle et des sitophilates de synthèse (2S*,3R*)-et (2R*,3S*); |
3) | comparaison en capillarité GLC des temps de rétention des dérivés naturels de la phéromone et des 2 éniantiomères de synthèse. |
37.
The primary structure of human apolipoprotein A-IV 总被引:2,自引:0,他引:2
C Y Yang Z W Gu I S Chong W J Xiong M Rosseneu H X Yang B R Lee A M Gotto L Chan 《Biochimica et biophysica acta》1989,1002(2):231-237
Human apolipoprotein (apo) A-IV was purified from chylous ascites fluid. Proteolytic peptides produced by trypsin and Staphylococcus aureus V8 proteinase digestions were purified by high-performance liquid chromatography and sequenced. Human apoA-IV contains 376 amino acid residues. The peptide-derived sequence generally matches two previously reported DNA-derived amino acid sequences except for discrepancies in five positions. In order to examine these discrepancies further, one complete apoA-IV cDNA clone and another partial clone were sequenced. Comparison of all the available information indicates that the peptide-derived sequence reported here is accurate. Sequencing errors probably account for some of the discrepancies between the two primary sequences predicted by earlier nucleotide analyses. In certain positions, however, bona fide sequence heterogeneity or cloning artifact cannot be excluded. 相似文献
38.
Yuzuru Mikami Sen Feng Yu Katsukiyo Yazawa Kazutaka Fukushima Akio Maeda Jun Uno Kiyoshi Terao Naoki Saito Akinori Kubo Ken -ichiro Suzuki 《Mycopathologia》1990,112(2):113-118
During our studies on toxic substances from clinically isolated Nocarida, a new isolate identified as Nocardia otitidiscaviarum from cutaneous nocardiosis was found to produce a toxic substance called HS-6 that had strong in vitro as well as in vivo toxicity. The mouse intraperitoneal LD50 value was 1.25 mg/kg and the ED50 value for L1210 cultured cells was 0.3 ng/ml. The structure of HS-6 was determined and found to belong to the 16-membered macrocyclic group with a molecular formula of C43H68O12. HS-6 also showed activity against pathogenic fungi such as Cryptococcus neoformans. 相似文献
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40.