Effects of Dietary Ampitheoe sp. Powder on Growth and Lipid Contents of Litopenaeus vannamei北大核心CSCD

This experiment was conducted to investigate the effects of dietary Ampitheoe sp. powder on the growth and the contents of astaxanthin, triglyceride (TG), total cholesterol (TCHO) and fatty acids of Litopenaeus vannamei. A total of approximately 6 777 L. vannamei with an initial body weight of (1. 80 ± 0.72) g were randomly divided into 3 groups, and there were 3 replicates (753 shrimp per replicate) in each group. Those shrimp fed diets containing 0 (D0 group), 8. 25% (D8. 25 group) and 33% (D33. 00 group) Ampitheoe sp. powder, respectively. The feeding trial lasted for 40 days. The results showed as follows: 1) the final body weight, weight gain rate, specific growth rate, yield and survival rate in D33.00 group were significantly higher than those in D0 group (P <0.05), whereas the feed conversion ratio was significantly lower than that in D0 group (P <0.05) . However, there was no significant difference between D33.00 group and the D8. 25 group in those indexes (P >0.05) . 2) The astaxanthin content in carapace, hepatopancreas and muscle of L. vannamei in D8.25 and D33. 00 groups was significantly higher than that in D0 group (P < 0. 05); that in D33.00 group was significantly higher than that in D8. 25 group (P < 0. 05) . 3) TG content in haemolymph, hepatopancreas and muscle in D8. 25 and D33. 00 groups was significantly lower than that in D0 group (P < 0.05); the TCHO content in hepatopancreas in D8. 25 group was significantly higher than that in D0 and D33.00 groups (P <0.05); TCHO content in muscle in D33.00 group was significantly higher than that in D0 group (P <0.05) . 4) The contents of eicosapentaenoic acid (EPA) and arachidonic acid (AA) in hepatopancreas in D33.00 group were significantly higher than those in D0 group (P <0.05) . The EPA content in muscle in D33.00 group was significantly higher than that in D0 group (P < 0. 05) . In conclusion, adding Ampitheoe sp. powder into the diet can improve the growth performance, the contents of astaxanthin, EPA and AA in L. vannamei, and affect the accumulation of TG and TCHO, which can be used as a functional diet in aquaculture. Considering the cost, the supplementation level of 8. 25% Ampitheoe sp. powder is more appropriate. © 2023 Chinese Journal of Pediatric Surgery. All rights reserved.     

多联干粉菌苗的研究 Ⅴ.随需配合多联菌苗

根据快疫、羔羊痢疾、猝狙、肠毒血症、黑疫、肉毒中毒和破伤风七联菌苗试验结果,以普遍应用的快疫、羔羊痢疾、猝狙和肠毒中毒血症四联菌苗为基础,剔出其中黑疫、肉毒中毒、破伤风一种或两种成分,配制成快疫、羔羊痢疾、猝狙、肠毒血症和黑疫五联苗;快疫、羔羊痢疾、猝狙、肠毒血症和肉毒中毒五联苗;快疫、羔羊痢疾、猝狙、肠毒血症和破伤风五联苗;快疫、羔羊痢疾、猝狙、肠毒血症、黑疫和肉毒中毒六联苗;快疫、羔羊痢疾、猝狙、肠毒血症、黑疫和破伤风六联苗;快疫、羔羊痢疾、猝狙、肠毒血症、肉毒中毒和破伤风六联苗。用绵羊试验了这些菌苗的免疫效力用上述六种菌苗免疫羊血清对各种相应细菌毒素的中和滴度测定了各种菌苗的效力。根据试验结果,可以根据防疫需要,以快疫、羔羊痢疾,猝狙和肠毒血症四联菌苗为基础。随意与黑疫、肉毒中毒,破伤风菌苗配成各种多联菌苗供用     

新建竹园的管理技术

文章对母竹的管理,水分管理,除草松土,肥料管理以及笋的保护和病虫害防治进行了一系列分析。     

烤烟成熟期控水对烟叶主要碳氮化合物含量的影响

成熟期是烤烟需水次临界期。为明确烤烟成熟期土壤水分对烟叶主要碳氮化合物的影响,试验在烤烟成熟期进行土壤控水,研究烟叶总糖、还原糖、淀粉、总氮和烟碱等的变化。结果表明：土壤含水率70%~85%,烤烟生长后期（移栽后约83天）烟叶总糖、还原糖和淀粉含量较高;干旱胁迫降低碳代谢,而干旱后复水碳代谢增强。70%~85%土壤含水率,烤烟总氮和烟碱水平较低;干旱胁迫促进氮代谢,总氮和烟碱含量较高;干旱胁迫后复水,烟叶总氮和烟碱含量处于中等水平。烤烟成熟期,土壤水分过高或过低,均不利于协调烟叶碳氮代谢平衡。     

烤烟成熟期控水对烟叶碳氮代谢关键酶活的影响?

成熟期是烤烟需水次临界期。为明确烤烟成熟期土壤水分对烟叶碳氮代谢的影响,试验在烤烟成熟期进行土壤控水,研究烟叶碳氮代谢主要关键酶活性的变化。结果表明：土壤水分亏缺（50%~60%田间持水量）致烟叶叶绿素含量降低,土壤水分充足（80%~85%田间持水量）烟叶绿素含量高,烟叶成熟缓慢,且复水能缓解干旱胁迫导致的烟叶早衰;烟叶成熟期,湿润土壤（70%~85%田间持水量）烟叶硝酸还原酶、转化酶和淀粉酶活性较高,土壤干旱使烟叶碳氮代谢关键酶活性减弱,但复水在一定程度上能恢复淀粉酶活性。     

近50年湖北耕地资源时空变化特征分析

研究单一土地利用类型的变化对整个区域的土地利用分析有着重要意义．而这方面的研究目前较少．选择湖北省近50年耕地时空演变特点作为研究对象，试从耕地的数量、质量、结构、利用程度、地域差异几个方面对其进行变化特征分析，各出的主要结论有：（1）1952～2001年．湖北省耕地数量先增后减，耕地变化速度很快；（2）耕地结构以水田为主．旱地为次，粮食作物尤其是水稻业在种植业结构中比例较大；（3）耕地总体利用程度较高，耕地产出效益较好，耕地利用与人类活动关系密切；（4）耕地整体质量在下降．一等耕地面积增加，后备耕地有限。预计到21世纪中后期，一等耕地比例增加，农业生产水平大有提高；（5）耕地资源区域差异明显，总趋势表现为：经济发达区比经济欠发选区流失严重．平原区比丘陵区减少量大。     

复方大黄净化液对慢性肾衰竭大鼠的治疗

为研究复方大黄净化液灌肠对慢性肾衰竭大鼠的治疗作用,通过复制慢性肾衰竭模型,分为病理对照组、药用炭组、复方大黄净化液大、中、小剂量灌肠治疗组,用药周期为58 d,测定了大鼠血清肌酐、尿素氮、尿肌酐、红细胞计数、血红蛋白含量及肾脏组织病理学变化。结果表明,复方大黄净化液各剂量组、药用炭组血清肌酐、尿素氮显著降低(P<0.05),且以复方大黄净化液大、中剂量组下降更为明显(P<0.05);复方大黄净化液各剂量组24 h尿肌酐显著升高(P<0.05),且以复方大黄净化液大、中剂量组更为明显(P<0.05);复方大黄净化液大、中剂量组红细胞计数、血红蛋白含量显著提高(P<0.05);灌肠后各剂量组可不同程度改善肾衰竭大鼠肾脏病理改变。复方大黄净化液对慢性肾衰竭大鼠肾功能、肾脏病理、贫血都具有一定改善作用,且存在量效依赖关系。     

切勿上“互助创富联盟”的当

近来，有一种以“互助创富联盟”、“民间互助、快速致富”为名类似传销的非法敛资活动在一些地方出现，并由城市转入了农村，且有愈演愈烈之势。它主要通过信件形式传播，欺骗对象主要是农民。     

优良绿化树种——落羽杉

落羽杉为杉科落羽杉属高大乔木,原产于北美洲东南部,为古老的孑遗树种,我国在20世纪20年代开始引进。现在珠江三角洲流域及长江流域栽培较多。落羽杉适应性很强,喜阳光、喜温湿气候,耐水湿也耐干旱。因此,对加强森林公园、维护自然保护区生物链和水土保持、涵养水源等均起到很好的作用。落羽杉的主要品种苏杉一号该品种是1990年以后江苏省林业科学研究院汪企明研究员等从落羽杉不同地理种源、家种中选育出的优良品种。苏杉一号叶较大,叶长1.0-1.8厘米,在侧生小枝上排成二列,叶色深,吸光性强。落叶期在12月下旬-1月上旬,较其他树种都迟。它在…     

枸橼贮存和播种

枸橼又名香橼,原产中国和印度,南方各主要产区均有栽培。常绿乔木,树冠开张,叶大,长椭圆形,无翼叶或翼叶很小,果实卵圆形或长圆球形均有;果皮黄色,粗糙有肋纹皮厚而且具有浓郁的芳香,味酸而苦涩,果实不堪食用。香橼目前主要作为绿化树种栽培,对结果要求不高。近几年城市绿化的快速发展,在苏北地区,曾有生长百年以上的香橼,已贩卖到了大城市作为城市景观。香橼作为新兴的绿化树种受到人们的普遍喜爱。加快香橼的繁殖,为城市绿化提供更多的优质香橼苗木是苗圃发展的新亮点。香橼的繁殖以播种为主,具体技术如下:一、种子的采收其种子应从品种纯…