[Soil respiration rate and its influencing factors in artificial land-bridge islands system].

It is of great significance to understand the pattern of soil respiration rate in fragmented forests for further revealing terrestrial ecosystem carbon cycling. With different habitats (island . mainland, island edge island interior) of the artificial land-bridge island system in Thousand Island Lake (TIL) region as the objects, we analyzed the seasonal dynamics of soil respiration rate and its relationships with soil physicochemical factors.

[Effect of thyroxine on the expression of HIF-1α after aneurysmal subarachnoid hemorrhage in rat brain and its mechanism].

To investigate the effect of thyroxine (T4) on the expression of hypoxia inducible factor-1α (HIF-1α) in rat brain after aneurysmal subarachnoid hemorrhage (SAH) and its mechanism. Seventy-two adult male SD rats were randomly divided into the following 4 groups: subarachnoid hemorrhage model group(SAH), subarachnoid hemorrhage model and T4 group (SAH with T4), subarachnoid hemorrhage model with normal saline group (SAH with vehicle), and sham-operation group, 18 rats in each group. The model of subarachnoid hemorrhage group was established by internal carotid artery puncture.

Analysis of synonymous codon usage and evolution of begomoviruses.

Begomoviruses are single-stranded DNA viruses and cause severe diseases in major crop plants worldwide. Based on current genome sequence analyses, we found that synonymous codon usage variations in the protein-coding genes of begomoviruses are mainly influenced by mutation bias. Base composition analysis suggested that the codon usage bias of AV1 and BV1 genes is significant and their expressions are high.