Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Sheng Wu Gong Cheng Xue Bao ; 37(8): 2836-2844, 2021 Aug 25.
Artigo em Chinês | MEDLINE | ID: mdl-34472301

RESUMO

It has been reported that ODB genes play an important role in homologous recombination-directed DNA repair, suggesting their potential applications in plant breeding. To analyze the expression characteristics of tobacco NtODB gene, the cDNA sequence of NtODB was obtained using in silico cloning technique. The physicochemical properties, signal peptide, and advanced structures of the predicted protein were analyzed using bioinformatics tools. The results showed that the NtODB gene has a 579-bp open reading frame which encodes a protein with 192 amino acid residues. The protein NtODB is predicted to be alkaline and hydrophilic. Real-time quantitative PCR showed that NtODB was constitutively expressed in different tissues. Subcellular localization showed that NtODB was mainly expressed in cell membrane and chloroplast. These results may help us to better understand and elucidate the roles of ODB genes in the homologous recombination-directed DNA repair.


Assuntos
Biologia Computacional , Tabaco , Sequência de Aminoácidos , Sequência de Bases , Clonagem Molecular , Simulação por Computador , DNA Complementar , Filogenia , Melhoramento Vegetal , Tabaco/genética
2.
Plant Dis ; 2021 Mar 17.
Artigo em Inglês | MEDLINE | ID: mdl-33728956

RESUMO

Crown rust of barley, caused by Puccinia coronata var. hordei (Pch), was first reported by Jin and Steffenson in 1992, and the fungus has been reported only in the United States and Hungary. In China, stripe, stem, and leaf rusts have been reported on barley, but not for crown rust. Recently, a sample (HZJ0004) of rust collected from barley in Qilian county, Qinghai, China, appeared different from the three rusts based on color, size, arrangements of uredinia and/or telia. Teliospores had crown-shaped appendages on the top. Based on the disease symptoms and morphology of urediniospores and teliospores, the fungus was identified as Pch. Using the internal transcribed spacer sequences, the isolates HZJ0004 from barley and POR3 from buckthorn (Rhamnus sp.) were clustered in one clade with Pch isolates from barley and Elymus repens but in a different clade from the isolate POC8 from wild oat and the varieties of P. coronata from oats and grasses. At the seedling stage, most of the tested cultivars of barley and rye were susceptible to Pch isolates HZJ0004 and POR3, but the cultivars of oats, triticale, wheat, and the most grasses of Aegilops, Brachypodium, Bromus, Calamagrostis, Deschampsia, Elymus, Festuca, and Phleum were resistant, indicating their host specialization on barley. This is the first report of crown rust on barley in China.

3.
Nat Prod Res ; 35(6): 921-929, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31148468

RESUMO

Chemical investigation of Jasminum pentaneurum Hand.-Mazz led to the isolation and identification of 12 compounds, which included one new secoiridoid glycoside, 10-(3-hydroxy-4-methoxy-benzoate)-ligustroside (4), three secoiridoid glycosides (1-3), and eight phenols (5-12). All compounds were reported for the first time from this plant. Their structures were elucidated based on extensive spectroscopic data analysis, including HR-ESI-MS, UV, IR, 1 D, and 2 D NMR. The absolute configuration of the new one (4) was further elucidated by comparison of its experimental and calculated quantum chemical electronic circular dichroism (ECD) spectra. All the isolates were assayed for their inhibitory activity on four human cancer cells. Compound 11 exhibited inhibitory effects against three human cancer cells SK-MES-1, SMMC-7721 and SGC-7901 with IC50 values ranging from 83.0 to 172.0 µM.


Assuntos
Jasminum/química , Neoplasias/patologia , Compostos Fitoquímicos/farmacologia , Espectroscopia de Ressonância Magnética Nuclear de Carbono-13 , Morte Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Humanos , Concentração Inibidora 50 , Compostos Fitoquímicos/química , Compostos Fitoquímicos/isolamento & purificação , Espectroscopia de Prótons por Ressonância Magnética
4.
BMC Infect Dis ; 20(1): 650, 2020 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-32887568

RESUMO

BACKGROUND: Cryptococcus is a conditional pathogenic fungus causing cryptococcosis, which is one of the most serious fungal diseases faced by humans. Lateral flow immunochromatographic assay (LFA) is successfully applied to the rapid detection of cryptococcal antigens. METHODS: Studies were retrieved systematically from the Embase, PubMed, Web of Science, and Cochrane Library before July 2019. The quality of the studies was assessed by Review Manager 5.0 based on the Quality Assessment of Diagnostic Accuracy Study guidelines. The extracted data from the included studies were analyzed by Meta-DiSc 1.4. Stata 12.0 software was used to detect the publication bias. RESULTS: A total of 15 articles with 31 fourfold tables were adopted by inclusion and exclusion criteria. The merged sensitivity and specificity in serum were 0.98 and 0.98, respectively, and those in the cerebrospinal fluid were 0.99 and 0.99, respectively. CONCLUSIONS: Compared to the urine and other samples, LFA in serum and cerebrospinal fluid is favorable evidence for the diagnosis of cryptococcosis with high specificity and sensitivity.


Assuntos
Criptococose/diagnóstico , Imunoensaio/métodos , Antígenos de Fungos/sangue , Antígenos de Fungos/líquido cefalorraquidiano , Antígenos de Fungos/urina , Líquido Cefalorraquidiano/microbiologia , Testes Diagnósticos de Rotina/métodos , Humanos , Sensibilidade e Especificidade
5.
J Anal Methods Chem ; 2020: 5165631, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32351755

RESUMO

Yizhi Granule (YZG) is a health food containing six traditional Chinese medicines (TCMs). It improves memory barriers in rat experiments. Here, we describe the first fast and sensitive ultraperformance liquid chromatography/electrospray ionization quadrupole time-of-flight mass spectrometry (UPLC/ESI-Q-TOF MS) method for analyzing YZG in plasma. We used this technique for studies in cynomolgus monkey plasma. By comparing retention time, MS, and MS/MS data of reference compounds, 70 compounds were detected in YZG. Of these, 63 were identified including 60 saponins, 2 flavones, and 1 methyl ester. There were 33 saponins, 1 flavone, and 1 methyl ester in the plasma. Next, to study the therapeutic properties of YZG, the neuroprotective effect of some of the absorbed components was evaluated using PC12 cell damage caused by the Aß 25-35 model. The results showed that 9 compounds protect PC12 cells from Aß 25-35 with cell viability (%) of 111.00 ± 8.12 (G-Rb1), 102.20 ± 4.22 (G-Rb2), 100.34 ± 6.47 (G-Rd), 102.83 ± 2.10 (G-Re), 101.68 ± 7.64 (NG-Fa), 101.19 ± 7.83 (NG-R1), 102.53 ± 0.55 (NG-R2), 106.88 ± 4.95 (gypenoside A), and 103.95 ± 4.11 (gypenoside XLIX), respectively, versus the control group (87.51 ± 6.59). These results can reveal the real pharmacodynamic basis of YZG and provide a theoretical basis for subsequent studies. It can also provide some references for the research of Alzheimer's disease.

6.
BMC Cell Biol ; 6(1): 9, 2005 Mar 03.
Artigo em Inglês | MEDLINE | ID: mdl-15743539

RESUMO

BACKGROUND: In this paper, we present and validate a way to measure automatically the extent of cell migration based on automated examination of a series of digital photographs. It was designed specifically to identify the impact of Second Hand Smoke (SHS) on endothelial cell migration but has broader applications. The analysis has two stages: (1) preprocessing of image texture, and (2) migration analysis. RESULTS: The output is a graphic overlay that indicates the front lines of cell migration superimposed on each original image, with automated reporting of the distance traversed vs. time. Expert preference compares to manual placement of leading edge shows complete equivalence of automated vs. manual leading edge definition for cell migration measurement. CONCLUSION: Our method is indistinguishable from careful manual determinations of cell front lines, with the advantages of full automation, objectivity, and speed.


Assuntos
Movimento Celular , Técnicas Citológicas/métodos , Automação , Técnicas Citológicas/normas , Células Endoteliais/citologia , Humanos , Métodos , Fotografação , Reprodutibilidade dos Testes , Fumaça/efeitos adversos
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...