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151.
Effect of l-arginine,casein hydrolysate,banana powder and sucrose on growth and solasodine production in shoot cultures of Solanum laciniatum 总被引:2,自引:0,他引:2
Gunawan Indrayanto Tristiana Erawati Mulja Hadi Santosa 《Plant Cell, Tissue and Organ Culture》1995,43(3):237-240
The addition of l-arginine, casein hydrolysate, banana powder and the reduction of the concentration of sucrose in the media could increase the solasodine content in the shoot cultures of Solanum laciniatum. No linear correlations between growth index, chlorophyll content and solasodine content were observed, however a positive linear correlation between solasodine productivity and chlorophyll content occurred in these shoot cultures.Abbreviations Ch
chlorophyll content
- DW
dry weight
- fl
flask
- FW
fresh weight
- GI
growth index
- LOD
limit of detection
- LOQ
limit of quantitation
- SDc
solasodine content
- SDp
solasodine productivity
- w
week 相似文献
152.
Alfonso Gutiérrez Harry M. Meade Paul Ditullio Daniel Pollock Merry Harvey Rafael Jiménez-Flores Gary B. Anderson James D. Murray Juan F. Medrano 《Transgenic research》1996,5(4):271-279
Transgenic mice were produced by microinjection of a DNA construct composed of the bovine -casein (-CN) cDNA under the control of the goat -CN 5 promoter elements and 3 flanking regions into pronuclear-stage embryos. The gene construct targeted the expression of bovine -CN RNA to the mammary gland and secretion of bovine -CN in the milk. In the three lines studied (BC-7, BC-31 and BC-67) the transgene was stably integrated and propagated as a Mendelian locus. Expression of the bovine protein in lactating mice from the three transgenic lines was demonstrated by northern and western blots. In ten different tissues analysed by northern blotting, expression was confined to the mammary gland of lactating transgenic mice from line BC-7, with low-level expression also observed in the salivary gland of lines BC-31 and BC-67. Transgene expression in the mammary gland paralleled normal casein gene expression during lactation and was not observed in virgin females. The level of bovine -CN mRNA expression on day 10 of lactation in hemizygous transgenic females in relation to endogenous mRNA of whey acid protein (WAP) gene expression was 14%, 69% and 127% in lines BC-7, BC-31 and BC-67, respectively. No association between transgene copy number and expression was observed. The bovine -CN concentration in milk on day 10 of lactation ranged from 0.94 to 3.85 mg of protein per ml of milk. The bovine -CN expressed in mouse milk had the same molecular mass and immunoactivity with polyclonal antibodies as did -CN from bovine milk. A high degree of variation in the production of bovine -CN within each of the transgenic lines was observed. 相似文献
153.
Animal cell lines are important resources for research and diagnostic applications. Cross-contamination and misidentification
of cell lines, however, can cause major problems for research (for example, false results that come from contamination cells
may mislead the science). Hence, it is imperative to routinely monitor cell lines for identity and authenticity. Here, we
extend our previous work on identification and authentication of animal cell culture by polymerase chain reaction (PCR) amplification
and DNA sequencing. A PCR-based method for rapid identification and authentication of closely related cell lines was described.
In this method, two new primers were designed based on high homology in the aldolase gene family. Used together with our previous
primers, the combinations of primers were able to differentiate closely related species, including human from monkey and mouse
from rat. This PCR assay provides a rapid, simple, sensitive, and cost-effective method for authentication of closely related
cell lines.
The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the funding
agency. 相似文献
154.
M Vierbuchen J Gunawan H Debuch 《Hoppe-Seyler's Zeitschrift für physiologische Chemie》1979,360(8):1091-1097
The formation of 1-alkylglycerol from 1-alkyl-sn-glycero-3-phosphoethanolamine in different cell fractions of rat brain is reported. The substrates used were labelled either with 14C or 3H in the alkyl residue or with 14C in the alkyl and 3H in the ethanolamine residue. The examination of the lipid- and water-soluble cleavage products showed that both ethanolamine and phosphoethanolamine are liberated from the substrate in the microsomal fraction of 14-day-old rat brain. The latter product is rapidly hydrolyzed. In comparison with other cell fractions, the microsomes contained the highest enzyme activities, which exhibited a pH optimum of 7.1--7.5. SH-group reagents are inhibitors, whereas diisopropylfluorophosphate has no effect. As the animals age, these enzyme activities decrease in brain homogenates. 相似文献
155.
The inference of gene regulatory network (GRN) from gene expression data is an unsolved problem of great importance. This inference has been stated, though not proven, to be underdetermined implying that there could be many equivalent (indistinguishable) solutions. Motivated by this fundamental limitation, we have developed new framework and algorithm, called TRaCE, for the ensemble inference of GRNs. The ensemble corresponds to the inherent uncertainty associated with discriminating direct and indirect gene regulations from steady-state data of gene knock-out (KO) experiments. We applied TRaCE to analyze the inferability of random GRNs and the GRNs of E. coli and yeast from single- and double-gene KO experiments. The results showed that, with the exception of networks with very few edges, GRNs are typically not inferable even when the data are ideal (unbiased and noise-free). Finally, we compared the performance of TRaCE with top performing methods of DREAM4 in silico network inference challenge. 相似文献
156.
The adherent behaviour of the Gram-positive Staphylococcus aureus and Staphylococcus epidermidis and the Gram-negative Escherichia coli on cotton, polyester and their blends through contact in aqueous suspensions was studied. Staphylococcus epidermidis was found to adhere to fabrics much more so than Staph. aureus. The adherence of both Staph. epidermidis and Staph. aureus to fabrics increased as the content of polyester fibres in the fabrics increased. The attachment of E. coli to all fabrics was very low and was not affected by the fibre contents. Total numbers of adherent bacteria on cotton and polyester fabrics were related directly to the concentrations of the bacterial suspensions. The extents of adherence, expressed by the percentage of adherent bacteria from the suspension, however, were independent of the concentration. The length of contact with bacteria was also found to affect the adherence of bacteria on fabrics studied. 相似文献
157.
Malamas MS Erdei J Gunawan I Barnes K Hui Y Johnson M Robichaud A Zhou P Yan Y Solvibile W Turner J Fan KY Chopra R Bard J Pangalos MN 《Bioorganic & medicinal chemistry letters》2011,21(18):5164-5170
The proteolytic enzyme β-secretase (BACE1) plays a central role in the synthesis of the pathogenic β-amyloid in Alzheimer's disease. SAR studies of the S2' region of the BACE1 ligand binding pocket with pyrazolyl and thienyl P2' side chains are reported. These analogs exhibit low nanomolar potency for BACE1, and demonstrate >50- to 100-fold selectivity for the structurally related aspartyl proteases BACE2 and cathepsin D. Small groups attached at the nitrogen of the P2' pyrazolyl moiety, together with the P3 pyrimidine nucleus projecting into the S3 region of the binding pocket, are critical components to ligand's potency and selectivity. P2' thiophene side chain analogs are highly potent BACE1 inhibitors with excellent selectivity against cathepsin D, but only modest selectivity against BACE2. The cell-based activity of these new analogs tracked well with their increased molecular binding with EC(50) values of 0.07-0.2 μM in the ELISA assay for the most potent analogs. 相似文献
158.
Peter J. Lamothe Merry Gallagher Douglas P. Chivers John R. Moring 《Environmental Biology of Fishes》2000,58(4):393-399
Ten yellow-phase American eels, Anguilla rostrata, were captured from Hammond Pond, a small freshwater pond located in central Maine, U.S.A. The eels were implanted with radio transmitters and released into nearby Hermon Pond. At the same time, 10 eels were captured from Hermon Pond, implanted with radio transmitters and returned to Hermon Pond to serve as a control group. The two ponds are connected by a 1.6km section of Souadabscook Stream. We tracked the 20 eels over the 90-day duration of the experiment. Four of the ten displaced eels returned to their home pond. None of the control fish were located outside of their home pond during the study. Three of the four eels that successfully returned to their home pond did so under the darkness of the new moon and the fourth made the journey during the first quarter moon phase. Location data showed that translocated and native eels tended to occupy different areas of Hermon Pond. This study provides evidence of homing behavior in American eels living in small freshwater ponds and indications that homing activity may be linked to lunar cycle. 相似文献
159.
Several concentrations of glycerol for cryoprotection and several concentrations of sucrose for cryoprotectant dilution were examined with frozen, thawed and cultured mouse embryos. Four hundred and eighty late morulae to early blastocyst stage embryos were collected from 35 superovulated mice (B6D2 x Swiss Webster crosses back-crossed to Swiss Webster males) 3-1/2 days after breeding. The embryos were transferred through increasing concentrations of glycerol in modified Dulbecco(1)s phosphate buffered saline (MDPBS) to reach three final concentrations of 1.0 M, 1.4 M and 1.8 M. The embryos were loaded in 0.5-ml French straws appropriately filled with the cryoprotectant and sucrose solutions for each treatment. The straws were cooled with a standard fast-freezing program to -35 degrees C, then plunged into liquid nitrogen. After 58 days of storage at -196 degrees C the straws were thawed in a 37 degrees C water bath. Cryoprotectant dilution was accomplished with a standard step-wise procedure or in the straw with one of three concentrations of sucrose solution (0.25 M, 0.5 M, 1.0 M) in MDPBS. The embryos were then washed twice in MDPBS, twice in Whitten's media for embryo culture and then placed in microdrops of Whitten's media under paraffin oil in a water saturated 5% CO(2) in air atmosphere at 37 degrees C. Embryos were observed 24 hours later for development to the expanded blastocyst stage. The proportion of embryos developing in vitro from the three glycerol concentrations were not significantly different with standard step-wise dilution procedures for glycerol removal. After step-wise cryoprotectant removal, blastocyst expansion occurred in 49%, 44% and 52% of embryos frozen in 1.0 M, 1.4 M and 1.8 M glycerol, respectively. The 1.0 M sucrose dilution of 1.0 M glycerol showed the highest development (60.5%) in vitro but was not significantly different from any of these three step-wise diluted glycerol concentrations. The step-wise dilution of the three glycerol concentrations and dilution of the 1.0 M glycerol and 1.0 M sucrose were all superior (P < 0.01) to any other dilution procedure examined. 相似文献
160.
Rosalind Parkes-Ratanshi Ali Elbireer Betty Mbambu Faridah Mayanja Alex Coutinho Concepta Merry 《PloS one》2014,9(7)