Comparative genome-wide DNA methylation analysis reveals epigenomic differences in response to heat-humidity stress in Bombyx mori.

DNA methylation is an important epigenetic modification and has been shown to be involved in the response to abiotic stress. However, there are few studies on DNA methylation in insect response to environmental signals. In this study, we conducted a comprehensive comparative analysis of DNA methylation profiles between two silkworm strains with significantly different resistance to heat and humidity by whole-genome bisulfite sequencing (WGBS).

[Inhibitory effects of an antisense PCDGF vector on proliferation and invasion of highly malignant ovarian cancer cells and the related mechanism].

Objective: To investigate the inhibitory effects of an antisense PC cell derived growth factor (PCDGF) vector on proliferation and invasion of highly malignant ovarian cancer cell lines Sw626 and A2780 cells, and preliminarily explore the related mechanisms.

Methods: MTT assay and Boyden chamber in vitro invasion assay were employed to detect the changes of proliferation and invasion ability in the Sw626 and A2780 cells transfected with anti-sense PCDGF. The expression levels of cyclin D1 and CDK4 proteins before and after transfection were detected by Western blotting.

Ethyl 4-(4-cyano-phen-yl)-6-methyl-2-thioxo-1,2,3,4-tetra-hydro-pyrimidine-5-carboxyl-ate.

The asymmetric unit of the title compound, C(15)H(15)N(3)O(2)S, contains two independent mol-ecules corresponding to the R and S enanti-omers. The dihydro-pyrimidinone rings adopt a flattened boat conformation. One of the ethyl groups is disordered over two orientations with occupancy factors of 0.

3-Nitro-benzaldehyde thio-semicarbazone.

The mol-ecule of the title compound, C(8)H(8)N(4)O(2)S, adopts an E configuration about both the C-N bonds. In the crystal structure, adjacent mol-ecules are linked by inter-molecular N-H⋯S hydrogen-bonding inter-actions, forming chains running parallel to the b axis.

4-Cyano-benzaldehyde thio-semi-carbazone.

The mol-ecule of the title compound, C(9)H(8)N(4)S, adopts an E configuration about both the C=N and C-NH bonds. In the crystal structure, adjacent mol-ecules are linked by inter-molecular N-H⋯S hydrogen-bonding inter-actions, forming chains running parallel to the b axis.

[Screen of media for insect cells (HzAm1) growth and its adaptation to low serum culture].

Insect cell-baculovirus system is a useful tool for both insecticidal virus production and the expression of medically useful foreign genes. Serum-free culture or low serum culture for insect cells is essential and significant. Media for the growth of insect cells HzAm1 from three kinds of commercial media TC-100,GRACE and IPL-41 with 10% serum were investigated and screened.

Multi-peak phenomenon of insect cell infection with baculovirus at low multiplicity of infection.

In this communication we report the infection of armyworm Spodoptera frugiperda IPLB-Sf-21 cells with Anticarsia gemmatalis multicapsid nucleopolyhedrovirus at low multiplicity of infection (MOI). The temporal variation of the extra-cellular virus and of the unstained cell was followed. The series of peaks in the virus concentration and the unstained cells count were used in order to infer the dynamic mechanism of the infection at low MOI.

A mathematical model of baculovirus infection on insect cells at low multiplicity of infection.

The expression efficiency of the insect cells-baculovirus system used for insecticidal virus production and the expression of medically useful foreign genes is closely related with the dynamics of infection. The present studies develop a model of the dynamic process of insect cell infection with baculovirus at low multiplicity of infection (MOI), which is based on the multi-infection cycles of insect cell infection at low MOI described. A mathematical model for the amount of viruses released from primary infected cells and the amount of free viruses before secondary infected cells release viruses has been developed.

[The transcriptional regulation study on human delta globin gene with CAAT box C-->T point mutation in its promoter].

Objective: To study the transcriptional regulation of human delta globin gene with C-->T point mutation at -64 in its promoter.

Methods: Human delta globin genes including wild CAAT box and mutant CAAT box (-64C-->T) were separately cloned into eukaryotic expression vector pcDNA3.1 (-)/Myc-His A which was cut out the strong promoter CMV, transfected MEL cells, and induced by DMSO to express.