我国保护土地资源的刑事立法研究

随着我国经济的飞速发展,土地升值,由此引发了形形色色土地违法犯罪案件,严重影响了我国经济健康、有序的发展。笔者从现阶段我国土地违法犯罪案件的特征着手,通过对现行刑法保护土地资源现状的分析,指出其中存在的问题,进而提出防范土地犯罪的相应法律对策。     

中蜂多层小蜂箱与意蜂标准箱生产性能比较

中华蜜蜂是我国饲养的重要蜂种之一。相较于西方蜜蜂较为统一的朗氏标准蜂箱,中蜂的蜂箱种类繁多。研发了1种中蜂多层小蜂箱,并对其生产性能进行了测定与比较。结果表明,中蜂多层小蜂箱蜂蜜夏季采集量略高于意蜂标准箱组,但差异不显著。多层小蜂箱蜂蜜波美度和含糖量高于意蜂标准箱组,含水量低于意蜂标准箱组,但差异也不显著。多层小蜂箱中蜂群势显著高于意蜂标准箱饲养组,表明多层小蜂箱比传统蜂箱更利于蜜蜂生产与繁殖。     

GC/MS测定明胶空心胶囊中17种塑化剂

目的:建立气相色谱/质谱联用检测明胶空心胶囊中17种塑化剂,包括邻苯二甲酸二异壬酯(DINP)的方法。方法:粉碎均匀样品用乙腈提取,超声提取30min后取上层清液用气相色谱/质谱联用仪测定。结果:17种塑化剂的线性关系较好,方法检出测限范围在0.01~0.24mg/kg,在高、中、低3个水平下进行明胶空心胶囊样品加标实验,平均回收率为86.68%~104.21%,相对标准偏差2.69%~5.11%(n=6)。结论:明胶空心胶囊用乙腈提取比用正己烷等溶剂提取效果好,同时方法的检出限低,且该方法简便、快捷,溶剂用量小、重现性好。     

Induction ofApoptosis in the ImmatureMouse Testes by aMixture ofMelamine and CyanuricAcid

The toxicity of melamine has attracted much attention since the recent outbreaks of renal injury in pets and infants. Previous studies indicated that melamine by itself had low toxicity, whereas a mixture of melamine and cyanuric acid (M+CA) could cause serious renal damage. At present, most researches on the toxicity of M+CA are focused on the kidney. However, little is known about the adverse effects of this mixture on the reproductive system. In the present study, the toxicity of M+CA to testes was investigated. Immature male mice were orally dosed with 0, 0.6, 3, and 15 mg kg-1 d-1 of a 1:1 M+CA for 28 d. Pathological changes occurred in germ cells, such as loose arrangement, reduced numbers and karyopyknosis, indicating that this mixture was toxic to spermatogenesis. Compared with the control group, the TUNELpositive germ cells increased significantly and the ratio of Bcl-2 to Bax, total antioxidant capacity and superoxide dismutase activity decreased significantly in the 3 and 15 mg kg-1 d-1 M+CA treated group, while the activities of caspase-3, caspase- 8 and caspase-9 remained unchanged. The results suggest that M+CA can induce apoptosis in the mice testes. The downregulation of Bcl-2/Bax and oxidative stress may play a pivotal role in the induction of apoptosis by M+CA in mice testes.