2个蓝莓品种叶片离体培养技术研究

以蓝莓品种‘北陆’‘斯巴坦’的组培苗叶片为外植体,研究其离体培养技术。结果表明:在含有1.5 mg/L ZT、0.3 mg/L IAA、30 g/L庶糖、4.5 g/L琼脂、pH值4.5的改良WPM培养基上进行离体叶片再生培养,最早37.7 d观察到再生植株。60 d后‘北陆’再生率最高达到93.5%,‘斯巴坦’再生率最高达到89.8%,‘北陆’再生效果优于‘斯巴坦’。‘北陆’叶片再生的适宜pH值为5.0,斯巴坦为4.5。pH值过高或过低再生率降低,愈伤组织形成少或无,叶片发黄、最后枯萎。不同叶片处理方式和暗培养对蓝莓叶片再生影响均不大。

U-Pb SHRIMP Dating of Zircon from Quartz Veins of the Yangshan Gold Deposit in Gansu Province and Its Geological Significance

The Yangshan gold deposit is a super-large fine-grained disseminated gold deposit located in southern Gansu Province. Its metallogenic age has been determined by using the cathodoluminescence image and ion probe U-Pb dating techniques. It is found that zircons from quartz veinlet of the fine-grained disseminated gold ore show characters of magmatic origin with prism idiomorphism, oscillatory zoning and dominant Th/U ratios of 0.5-1.5. Three main populations of zircons are obtained, giving average 206Pb/238U ages of 197.6±1.7 Ma, 126.9±3.2 Ma and 51.2±1.3 Ma respectively. The first age corresponds to the K-Ar age of the plagiogranite dike, while the latter two ages indicate that buried Cretaceous and Tertiary intrusives exist in the orefield, suggesting that the Yangshan gold deposit was genetically related to the three magmatic hydrothermal activities. By contrast, zircons from coarse gold-bearing quartz vein in the mining area are much older than the host rock, indicating that the vein was formed earlier and was not contaminated by later magmatic fluids. It is concluded that the coupling of multiperiodic hydrothermal activities in the mining area has contributed a lot to mineralization of the Yangshan gold deposit.

淫羊藿苷通过上调Runx2促进踝关节骨折大鼠骨重建及抑制破骨细胞形成

【目的】观察淫羊藿苷对踝关节骨折大鼠的治疗作用及机制。【方法】取55只SD大鼠,建立踝关节骨折模型。将成功造模的全部50只大鼠随机分为模型组,淫羊藿苷低、中、高剂量组及阳性药组,每组10只。淫羊藿苷低、中、高剂量组分别给予腹腔注射淫羊藿苷30、60、120 mg/kg,阳性药组给予腹腔注射复方骨肽注射液0.4 mL/kg,模型组给予腹腔注射等体积生理盐水,每日1次,连续给药4周。给药结束后,进行Micro-CT活体扫描及生物力学测试,采用抗酒石酸酸性磷酸酶(TRAP)染色法检测骨痂组织破骨细胞数量,苏木素-伊红(HE)染色法观察骨痂组织病理学变化,采用Western Blot法检测骨痂组织Runt相关转录因子2(Runx2)蛋白表达量。【结果】与模型组比较,淫羊藿苷低、中、高剂量组和阳性药组干预2、4周后骨小梁数量(Tb.N)、最大载荷、刚度、骨体积分数(BV/TV)值及骨痂组织Runx2蛋白表达量升高,骨痂组织破骨细胞数量减少(P<0.05),淫羊藿苷各剂量组作用效果呈剂量依赖性;但淫羊藿苷各剂量组干预2、4周后Tb.N、最大载荷、刚度、BV/TV值及骨痂组织Runx2蛋白表达量均低于同期阳性药组,骨痂组织破骨细胞数高于阳性药组(均P<0.05)。【结论】淫羊藿苷可促进踝关节骨折创伤大鼠骨重建,抑制破骨细胞形成,提高生物力学性能,其作用机制可能与上调Runx2蛋白表达有关;但其作用效果不及复方骨肽注射液。

离开原创的日子很无聊——黑防八周年感悟之九

首先我要宣布的，是一个亦惊亦喜的消息：我们将在4月封闭黑防论坛。黑客防线的官方论坛将由现在开放论坛封闭为只对作者和会员开放的内部论坛。