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10月1日是国际老年人日,而农历九月九日,又是中国传统的重阳节,也称“老人节”重阳日,历来就有赏菊花的风俗。 相似文献
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硼测定方法的研究现状 总被引:3,自引:0,他引:3
在自然界中,硼的存在形式主要有3种,即硼酸、硼酸盐及其与钠、镁、钙形成的络合物。在岩石、土壤、水和大气中都含有不同量的硼,其中海水中硼较高,平均浓度可达4.6mg/L。硼作为一种化学元素是植物生长中所必需元素,参与植物体内的物质同化及运转、细胞分裂等代谢作用。 相似文献
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介绍了利用甲亚胺-H酸法测定土壤中硼的含量,并与姜黄素法比较,方法简单、定量准确,能够满足对土壤、微肥测定硼含量的要求,方便易行。 相似文献
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目的 建立菊花茶中56种农药残留的分散固相萃取(QuEChERS) - 气相色谱串联三重四级杆质谱(GC - MS/MS)测定方法。方法 样品用乙腈提取,PSA+C18+GCB混合型分散固相萃取剂净化,DB - 5MS色谱柱分离,多反应监测模式(MRM)检测,外标法定量。结果 在0.005~500 mg/L范围内,56种农药的线性相关系数均≥0.995,方法定量限为0.002~0.057 mg/kg,平均回收率为60.0%~118.0%,相对标准偏差(RSD)为0.53%~20.09%。结论 该方法简单快速灵敏,可以实现菊花茶中农药残留的快速高通量检测。 相似文献
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饮水硼对动物空肠发育的影响 总被引:2,自引:0,他引:2
由饮水途径添加硼,研究硼对动物空肠发育的影响。实验取240只1日龄固始鸡,随机分为4组,分别在饮水中添加0、100、200、400 mg/L硼,试验期42 d,每周末每组取试验鸡6只,颈静脉放血致死,取空肠Bouin液固定,制作石蜡切片,HE染色,显微观测、摄影。结果:100 mg/L组空肠绒毛和肠腺的长度显著(P<0.05)或极显著(P<0.01)大于同日龄对照组。400 mg/L组空肠绒毛和肠腺的长度显著(P<0.05)或极显著(P<0.01)小于同日龄对照组(P<0.01)。7~28日龄400 mg/L组空肠出现绒毛上皮细胞肿胀、结缔组织水肿、毛细血管扩张、肠腺囊肿等病变。实验表明:饮水添加100 mg/L硼对固始鸡空肠绒毛及肠腺发育有明显的促进作用;添加400 mg/L硼会引起机体硼中毒,对固始鸡空肠绒毛及肠腺发育有明显抑制和毒害作用,严重影响机体的消化吸收功能。 相似文献
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Minoru Suzuki Ituro Kato Teruhito Aihara Junichi Hiratsuka Kenichi Yoshimura Miyuki Niimi Yoshihiro Kimura Yasunori Ariyoshi Shin-ichi Haginomori Yoshinori Sakurai Yuko Kinashi Shin-ichiro Masunaga Masanori Fukushima Koji Ono Akira Maruhashi 《Journal of radiation research》2014,55(1):146-153
We retrospectively review outcomes of applying boron neutron capture therapy (BNCT) to unresectable advanced or recurrent head and neck cancers. Patients who were treated with BNCT for either local recurrent or newly diagnosed unresectable head or neck cancers between December 2001 and September 2007 were included. Clinicopathological characteristics and clinical outcomes were retrieved from hospital records. Either a combination of borocaptate sodium and boronophenylalanine (BPA) or BPA alone were used as boron compounds. In all the treatment cases, the dose constraint was set to deliver a dose <10–12 Gy-eq to the skin or oral mucosa. There was a patient cohort of 62, with a median follow-up of 18.7 months (range, 0.7–40.8). A total of 87 BNCT procedures were performed. The overall response rate was 58% within 6 months after BNCT. The median survival time was 10.1 months from the time of BNCT. The 1- and 2-year overall survival (OS) rates were 43.1% and 24.2%, respectively. The major acute Grade 3 or 4 toxicities were hyperamylasemia (38.6%), fatigue (6.5%), mucositis/stomatitis (9.7%) and pain (9.7%), all of which were manageable. Three patients died of treatment-related toxicity. Three patients experienced carotid artery hemorrhage, two of whom had coexistent infection of the carotid artery. This study confirmed the feasibility of our dose-estimation method and that controlled trials are warranted. 相似文献
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世罕泉天然苏打水的化学成分含重碳酸钠,具有典型的弱碱性,含有有益的元素硼,物理性质与结构呈所见水分子团最小者之一,呈负电位,并含溶解氧。由上述组成特点决定了该水的广泛对人体功效特点。 相似文献
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目的:应用研发的腹水超滤治疗仪和腹水超滤技术进行顽固性腹水的临床观察研究。方法:采用腹腔对腹腔腹水浓缩回输技术对各类病因引起的顽固性腹水的647例患者进行治疗。结果:顽固性腹水患者平均治疗(2.8±1.5)次,治疗时间为(2.4±1.2)h/次;滤出腹水(8543±2427)ml/次,体重平均下降(8.4±2.4)kg;腹围由治疗前的(108.7±13.5)cm降低至(87.4±15.3)cm;24 h尿量明显增加,由治疗前的(257.8±235.6)ml增至(725.8±436.9)ml(t=3.147,P<0.01)。不良反应发生率为3.3%(63例/1892例次)。结论:腹腔对腹腔腹水浓缩回输技术方法简单,适应症广,且不良反应小,是一种治疗顽固性腹水有效的方法。 相似文献