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麦茬复种青贮玉米栽培研究 总被引：7，自引：1，他引：6
为进一步挖掘生产潜力,增加经济效益,进行了麦茬复种青贮玉米栽培试验研究与推广。研究表明,麦茬复种青贮玉米苗期短,生长速度快,在北方麦收后及时播种玉米,选择适宜品种和密度,结合科学灌水施肥,可获得高产,高质量的青贮草。 相似文献
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This experiment was aimed to study the effect of quinestrol on the expression of PCNA and Caspase-3 in spermatogenic cells of juvenile mice. 4-week old male mice were randomly divided into four groups. Mice in the control group were injected intraperitoneally with olive oil alone and mice in the experiment groups were injected intraperitoneally with octylphenol resolved in olive oil at 1, 10, 100 mg/kg doses respectively for 1 week (once a day). The testes were immediately removed for weighing and serial cross-sections that were used for histological examination when the mice were 8-week-old. The expressions of PCNA and Caspase-3 in spermatogenic cells were determined by immunohistochemical method. The results showed that the thickness of the convoluted seminiferous tubule decreased, cellular deranged, cell layers decreased and intercellular space increased. Meanwhile, there were a large number of abnormal shedding of spermatocytes and round spermatids, but few elongated spermatids and spermatozoa. The expression of PCNA extremely significantly decreased and the expression of Caspase-3 extremely significantly increased as quinestrol dose increased (P＜0.01). Quinestrol caused male reproductive function injury through inhibiting proliferation and promoting apoptosis in spermatogenic cells by regulating the expression of associated proteins. 相似文献
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利用ELID磨削技术对纳米硬质合金的磨削性能进行了实验研究,并将纳米硬质合金的磨削性能和普通硬质合金的磨削性能做了对比.分析了磨削工艺参数如磨削深度、工件进给速度对磨削性能的影响.研究结果表明,在相同磨削条件下,纳米硬质合金磨削力高于普通硬质合金,磨削表面质量优于普通硬质合金. 相似文献
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