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不同产地南果梨果实品质比较 总被引:4,自引:0,他引:4
用5个主要南果梨产区的南果梨进行试验,重点测果实糖分组成.结果表明:南果梨果实的糖分组成以果糖为主,占总糖的50%以上;不同产地南果梨果实总糖、可滴定酸、Vc及糖组分含量差异较大,阜新地区南果梨总糖及果糖含量最高,分别为190.27、99.65mg/mL,海城地区南果梨总糖及果糖含量最低,分别为97.74、60.24mg/mL,虽然鞍山地区是南果梨的优势产区,但鞍山地区的南果梨总糖及果糖含量却不是最高的,这个结果与生产中反映的鞍山南果梨果实品质近年来有所下降相符合. 相似文献
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对七带石斑鱼胚胎和仔稚鱼发育过程进行了观察,描述了从受精卵到仔稚鱼各发育时期的形态特征;在水温22±0.5℃、盐度30条件下进行七带石斑鱼仔鱼的饥饿耐受力实验,记录了饥饿条件下初孵仔鱼的存活与生长、卵黄囊与油球的利用情况。结果表明,胚胎发育可划分为卵裂期、囊胚期、原肠胚期、神经胚期和器官形成期。在水温20.5±0.5℃、盐度30.0条件下,受精卵历时38h45min孵化出膜。初孵仔鱼全长1.059±0.071mm,至4日龄全长2.27~2.36mm时,卵黄囊完全消失;16日龄,全长4.99mm时,鳔形成;至25~30日龄,尾鳍鳍条发育完整。在饥饿条件下,初孵仔鱼的死亡高峰出现在孵化后4~6d,半数死亡时间出现在5d,至7d饥饿仔鱼全部死亡。卵黄囊期仔鱼的生长可分为3个阶段:仔鱼初孵时的快速生长期,卵黄囊消失前后的慢速生长期,以及在不能建立外源性摄食后的负生长期。随着生长发育时间的延长,饥饿仔鱼与正常条件下仔鱼的生长差异显著(P<0.05)。饥饿仔鱼体长较短,头大且体瘦,长期饥饿后脑后部下陷。 相似文献
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ZOU Xiao-ying HE Zhi-yi DENG Jia-zhen DENG Jing-min LIU Guang-nan ZHONG Xiao-ning 《园艺学报》2008,24(10):2013-2015
AIM: To study the effects of nacetylcysteine on cigarette smoke-induced airway inflammation. METHODS: SD rats were divided into three groups randomly: control, cigarette smoking and cigarette smoking plus nacetylcysteine (NAC). Animals were treated for four weeks. Airway inflammation was assessed with light microscope. The concentrations of IL-8 and glutathione (GSH) in bronchoalveolar lavage fluid (BALF) were measured by ELISA. The expression of nuclear factor-κB (NF-κB) in the cells of BALF was detected with EMSA. RESULTS: Airway inflammation in NAC treatment group was significantly decreased than that in cigarette smoking group. GSH levels in BALF in NAC treated groups were significantly higher than those in cigarette smoking group. IL-8 levels in BALF in NAC treated groups were significantly lower than those in cigarette smoking group. Expression of NF-κB in the cells of BALF was much lower than that in the cigarette smoking group. CONCLUSION: NAC not only increases oxidative capacity in the bronchial, but also reduces the express of NF-κB, which inhibits the IL-8 production. At last it further reduces the airway inflammation. 相似文献
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采用正交设计建立并优化了梨的SRAP-PCR分子标记技术体系,在20 μL的反应体系中含有DNA15 ng/mL,Primer o.5μmol/L,dNTPs 0.1 mmol/L,Mg2+2 mmol/L,Taq DNA聚合酶1.5 U。应用20对引物组合对SRAP标记在“红巴梨×南果梨”F1群体的多态性和分离方式进... 相似文献
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AIM: To investigate the effects of drynaria total flavonoids on serum levels of leptin (LEP), interleukin 6(IL-6), prostaglandin E2(PGE2) and the expression of bone β2-adrenergic receptor (ADRB2) in a rat model of ovariectomized osteoporosis(OP). METHODS: The osteoporosis model was established by ovariectomy. Twelve weeks after modeling,bone mineral density (BMD) was determined by dual-energy X-ray absorptiometry to verify successful modeling.Enzyme-linked immunosorbent assay was applied to detect the concentrations of LEP, IL-6 and PGE2 in serum. The expression of ADRB2 was determined by immunohistochemical technique. RESULTS: Compared with sham group,BMD of the rats in model group significantly decreased in multiple regions 12 weeks after modeling(P<0.01). The serum levels of LEP, IL-6 and PGE2 in model group were significantly higher than those in sham group(P<0.05). The levels of LEP, IL-6 and PGE2 in drynaria total flavonoids group were significantly lower than those in model group(P<0.01). No significant difference of PGE2 between these 2 groups was observed. The ADRB2 expression in sham group and treatment group was significantly different from that in model group, and no significant difference between sham group and treatment group was found. CONCLUSION: The serum levels of LEP, IL-6 and PGE2 and the expression of bone ADRB2 increased in OP rats.Drynaria total flavonoids reduce the production of LEP, IL-6 and the expression of ADRB2, and suppress the bone absorption, which may be one of the mechanisms in treating OP. 相似文献
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以膨化甘薯粉为原料,通过单因素试验研究不同料水比、糖化酶用量、糖化时间、酵母接种量等几个主要因素对挤压膨化甘薯粉酒精发酵的影响。试验结果表明,挤压膨化甘薯粉生产燃料酒精的最佳条件为料水比1.0∶2.0、糖化酶用量110 U/g、糖化时间30 min、酵母接种量0.10%。在该工艺条件下,发酵醪酒精体积分数达到14.92%(v/v),与传统酒精发酵工艺相比,酒精体积分数提高了3.07个百分点。外加氮源对发酵没有明显的作用。 相似文献