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运用土地利用动态度模型分析了新疆若羌县1978—2017年耕地面积及主要作物和红枣种植面积变化情况。结果表明,近40年若羌县耕地面积变化总体呈扩张趋势;自2001年以来,若羌县以大幅度提高农牧民收入为突破口,加大农业产业结构战略性调整,以建设中国最优红枣基地为目标,使得若羌县红枣种植面积迅速增加;由于若羌县新开垦的耕地采用了套种模式,通过种植棉花和粮食作物熟化后再栽培红枣,所以棉花、小麦、玉米等农作物播种面积呈先大幅增加后减少趋势。 相似文献
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AIM: To investigate the effects of Auricularia auricular-judae polysaccharide(AAP) on pulmonary tissues of rats with LPS-induced acute lung injury(ALI) and its mechanisms.METHODS: Adult Sprague-Dawley rats were randomly divided into control group, LPS group,low-dose AAP group, middle-dose AAP group, high-dose APP group, and dexamethasone group. The rats were injected with LPS(8 mg/kg, ip) to induce ALI. The rats in the AAP groups were treated with AAP for 7 d before the induction of ALI. The protein concentration in the bronchoalveolar lavage fluid(BALF) was measured. The lung edema degree was measured by detecting the wet/dry weight ratio. The myeloper-oxidase(MPO), total antioxidant capacity(T-AOC), total superoxide dismutase(T-SOD), nitric oxide synthase(NOS) and malondialdehyde(MDA) levels were determined. The pathological changes of the lung tissues were evaluated by HE staining.RESULTS: Treatment with AAP significantly improved LPS-induced lung pathological changes, attenuated the protein concentration in the BALF and wet/dry weight ratio, inhibited the activities of MPO and NOS, reduced MDA level and increased the activities of T-AOC and T-SOD.CONCLUSION: AAP protects against LPS-induced acute lung injury in rats. 相似文献
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以蒙古黄芪种子根尖为试验材料,采用细胞化学染色与制片、C-分带、计算机及其软件辅助,测量鉴定与比对分析的方法,研究了中药草蒙古黄芪体细胞染色体数目、核型与带型。结果表明:蒙古黄芪体细胞染色体核型是2n=16=2L+4M1+6M2+4S,共有8对染色体,核型类型属于2B型,A.sK(核型不对称系数)=16.17/25.63×100%=63.09%,染色体总体积为69.0μm3;蒙古黄芪的体细胞染色体C-带带型为2n=16=8m+6sm+2sm+sat,第3号染色体短臂区段带有随体,该试验可为黄芪及其蒙古黄芪的鉴定识别与利用提供参考。 相似文献
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为延长巴哈利货架期,以菌落总数为评价指标,研究山梨酸钾、双乙酸钠、脱氢乙酸钠等化学防腐剂单一使用及复配比例对其抑菌效果的影响。结果表明,3种化学防腐剂单一使用的最佳添加量为:山梨酸钾0.8 g/kg,双乙酸钠2 g/kg,脱氢乙酸钠0.4 g/kg。复配使用的最佳配比为:0.25 g/kg山梨酸钾+1 g/kg双乙酸钠+0.25 g/kg脱氢乙酸钠。复配防腐剂的效果优于单一防腐剂,可以使巴哈利的保质期从5 d延长至18 d。 相似文献
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<正>疏勒县位于新疆维吾尔自治区西南部,喀什地区西北部。全县有耕地面积4.43万hm2,在农民人均耕地面积很少的情况下,2008年疏勒县县委、人民政府为了提高农民收入决定扩大红枣播种规模,推 相似文献
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