检索结果-南通市图书馆

Gonad traits and age structure of the sea urchin Heliocidaris crassispina in central range:a comparison with rangeextenders

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第5期41卷 1954-1964页

作者： wenping feng Daichi NAKANO Nobuyasu NAKABAYASHI Masakazu NAOKI Xiaofei TIAN Yukio AGATSUMA Fisheries College Zhejiang Ocean UniversityZhoushan 316022China Graduate School of Agricultural Science Tohoku UniversitySendai 980-8572Japan Fukui Prefectural University Fukui 910-1195Japan Akita Prefectural Institute of Fisheries Oga 010-8570Japan

The sea urchin Heliocidaris crassispina has northern expanded in geographic range to Toga Bay,Oga Peninsula in the Sea of Japan due to the global *** demonstrate the gonad traits and age structure of *** in the central range and compare the difference with those in northern extended range,we collected 100 *** individuals from a barren off Shitsumi,Fukui(central range),in August *** growth,gonad traits(size,development and color),and sex ratio were investigated and compared with those in Toga Bay,in August 2014(extended range).The successive 2012–2016 year classes of *** indicated successive juvenile recruitment in the central range,as found in the extended *** individuals at three years old in central range were obviously larger than those in the extended range,showing large test diameter and body weight,possibly due to the higher temperature in central range than that in northern extended *** addition,a balanced sex ratio in the central range was found,in contrast to the female-skewed sex ratio found in the extended *** development was sex-and *** testicular development in the central range was not only delayed in comparison to ovarian development,but also less delayed than those in the extended range,which possibly attribute to the higher water temperature in the central range.A significantly lower male gonad index and L*(lightness)value was recorded in central ranges compared to that in extended range,possibly due to the releasement of sperm of *** in central ranges.

关键词： Heliocidaris crassispina age gonad development gonad color range extension

Deactivation and regeneration of TS-1/SiO2 catalyst for epoxidation of propylene with hydrogen peroxide in a fixed-bed reactor

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2013年第2期7卷 202-209页

作者： Hainan SHI Yaquan WANG Guoqiang WU wenping feng Yi Lin Teng ZHANG Xing JIN Shuhai WANG Xiaoxue WU Pengxu YAO Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering & Technology Yianjin University Tianjin 300072 China

TS-1/SiO2 catalyst for the epoxidation of propylene with hydrogen peroxide in a fixed-bed reactor has been investigated. The catalyst activity decreases gradually with the online reaction time, but the selectivity of propylene epoxide is kept at about 93%. The fresh, deactivated and regenerated catalysts were characterized with X-ray diffraction, Fourier transform infrared spectro- scopy, ultra-violet-visible diffuse reflectance, Brunner- Emmett-TeUer method and thermogravimetric analysis, and the deactivated catalyst was regenerated with H2O2/ methanol solution. Compared with the fresh catalyst, both the framework structure and the content of titanium in the framework of the deactivated and regenerated TS-1/SiO2 catalysts were not changed. The major reason of the catalyst deactivation was the blockage of the channels of the catalyst by bulky organic by-products, which covered the active centers of titanium in TS-1. The deposited materials on the deactivated TS-1/SiO2 catalyst could be removed by treatment with hydrogen peroxide/methanol solution or pure methanol; the higher the treatment temperature and the higher the concentration of H2O2 in methanol, the higher the extent of the regeneration. The regeneration treatment did not influence the product selectivity in the propylene epoxidation.

关键词： TS-1/SiO2 epoxidation of propylene fixed-bed reactor deactivation regeneration

新型多酸-有机亚胺-分子筛杂化材料的氧化催化性能

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

化工学报 2011年第6期62卷 1563-1568页

作者：胡江磊冯文平郭伊荇张龙长春工业大学化工学院吉林长春130012 东北师范大学化学学院吉林长春130024

利用3-氨基丙基三甲氧基硅修饰的SBA-15、苯甲醛以及过渡金属单取代Keggin型杂多酸盐(SiNiW11)合成了一系列有序介孔二氧化硅杂化材料(SiNiW11-Schiff-SBA-15)。通过对杂化材料进行表征,证明SiNiW11的Keggin单元以及希夫碱配体在负载之... 详细信息

利用3-氨基丙基三甲氧基硅修饰的SBA-15、苯甲醛以及过渡金属单取代Keggin型杂多酸盐(SiNiW11)合成了一系列有序介孔二氧化硅杂化材料(SiNiW11-Schiff-SBA-15)。通过对杂化材料进行表征,证明SiNiW11的Keggin单元以及希夫碱配体在负载之后结构保持完整,并研究了杂化材料的形貌和表面物理化学性质。制备的杂化催化剂的氧化催化性能通过过氧化氢选择性氧化苯乙烯反应进行系统研究。在乙腈溶剂中,使用100 mg催化剂,H2O2与苯乙烯的摩尔比为1∶1,60℃条件下反应12 h,苯乙烯的转化率为56.8%,苯甲醛的选择性可达到97.0%。最后,对杂化催化剂的循环使用情况进行了评价。

关键词：有序介孔材料杂多酸盐希夫碱选择性氧化苯甲醛

EFFECT OF ENDURANC TRAINING AND SUPPLEMENTATION OF L-Arg ON THE eNOSmRNA GENE EXPRESSION IN CARDIAC MUSCLE AND LIVER OF RATS

在线全文

学校读者我要写书评

暂无评论

EFFECT OF ENDURANC TRAINING AND SUPPLEMENTATION OF L-Arg ON ...

Effects of light and covering behavior on PAX6 expression in the sea urchin Strongylocentrotus intermedius

第4届全国青年体育科学学术会议

作者： Jianfang Xu, Li Zhang, Lianshi feng, wenping feng China Institute of Sport Science, Beijing 100061

＜正＞Purpose: This study is aimed to observe the effect of endurance training and supplementation of L-Arg on the eNOSmRNA gene expression in cardiac muscle and liver of the rats. Methods: 70 male SD rats were divided into sedentary control group, endurance training group, exhaustive training group, small-dosage endurance training group（with a daily supplementation of 40 mg/kg wt L-Arg）, small-dosage exhaustive training group(with a daily supplementation of 40 mg/kg wt

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effects of light and covering behavior on PAX6 expression in...

Effects of inbreeding on growth, gonad development, production, quality and MYP expression in the sea urchin Strongylocentrotus intermedius

“全球变化下的海洋与湖沼生态安全”学术交流会

作者： Chong ZHAO Nanjing JI Ping SUN wenping feng Jing WEI Yaqing CHANG Key Laboratory of Mariculture & Stock Enhancement in North China's Sea Ministry of Agriculture Dalian Ocean University College of Marine Life Sciences Ocean University of China

We studied the diel expression pattern of PAX6（a structural gene that is commonly involved in the eye development and photoreception of eye forming animals） and the effects of light and covering behavior on PAX6 expression in the sea urchin Strongylocentrotus intermedius. We confirmed that aphotic condition significantly reduced covering behavior in S. intermedius. The diel expression pattern of PAX6 was significantly different in S. intermedius under photic and aphotic conditions. The gene expression of PAX6 significantly deceased in covered S. intermedius both under natural light and in darkness. The present finding provides valuable insight into the probable link between covering and PAX6 expression of sea urchins. Further studies are required to investigate the detailed expression network of light detection involved genes in order to fully reveal the molecular mechanism of the light-induced covering behavior of sea urchins.

关键词： sea urchin Strongylocentrotus intermedius light covering behavior PAX6

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effects of inbreeding on growth, gonad development, producti...

“全球变化下的海洋与湖沼生态安全”学术交流会

作者： feng wenping CHANG Yaqing ZHAO Chong SUN Ping WEI Jing HOU Shouquan Key Laboratory of Mariculture and Stock Enhancement in North China’s Sea Ministry of Agriculture Dalian Ocean University

The sea urchin Strongylocentrotus intermedius is a good model to investigate the potential inbreeding depression of introduced marine echinoderms from the views of ecological management and aquaculture. Here, we found significant inbreeding depression in gonad development and gonad sweetness of S. intermedius in one generation full-sibling inbreeding, while not in the traits of test size, body weight and gonad weight and gonad color. These results clearly indicate that gonad development and sweetness are sensitive and vulnerable to inbreeding depression, offering environmental evidences of the importance of avoiding inbreeding in artificial breeding programs of sea urchins. The present study provides valuable information and direct applications into the aquaculture of sea urchins.

关键词： Sea urchin Strongylocentrotus intermedius inbreeding gonad production gonad quality

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

小学数学课堂教学有效性的研究

科教导刊 2017年第4X期 97-98页

作者：冯文平凌云县逻楼镇中心校广西百色533105

随着新课改要求的提出,课堂教学有效性成为教学的主要追求目标。所谓课堂教学有效性就是指的教师可以用最少的时间,采取最有效的方法,来达到最满意的教学效果。当然教学的有效性始终是要从学生的学习特点出发,进而展开教学手段。尤其是... 详细信息

随着新课改要求的提出,课堂教学有效性成为教学的主要追求目标。所谓课堂教学有效性就是指的教师可以用最少的时间,采取最有效的方法,来达到最满意的教学效果。当然教学的有效性始终是要从学生的学习特点出发,进而展开教学手段。尤其是在小学数学教学中,数学的学习是基础,是培养学生逻辑思维能力和想象力的关键所在,所以有效的课堂教学显得尤为重要。本文将对小学数学课堂教学的无效低效原因进行分析,并且为小学数学课堂教学的有效性提供有效的策略,希望可以为学生创造更好的学习环境,有效提高课堂教学效果。

关键词：小学数学课堂教学有效性

在线全文

学校读者我要写书评

暂无评论

黄连汤加减应用治胃痛60例临床分析

河南中医学院学报 2006年第6期21卷 44-45页

作者：冯文萍滑县计划生育服务站河南滑县456400

黄连汤载于《伤寒论》,原治“伤寒,胸中有热,胃中有邪气,腹中痛,欲呕吐者。”笔者从2001年3月至2003年3月应用本方加减治疗胃痛60例,取得较满意的疗效,现总结如下。[第一段]

关键词：胃脘痛黄连汤香砂六君子汤

千米深井回风井临时提升能力验算与设备选型研究

在线全文

学校读者我要写书评

暂无评论

煤炭与化工 2016年第7期39卷 136-139页

作者：冯稳平霍州煤电集团乡宁沙坪煤业有限公司山西乡宁042100

为了解决磁西一号矿井副井临时提升能力较紧张实际情况,提人进风井进行临时提升系统改造,通过提出与比对两种改造方案,确定了选用落地式多绳摩擦提升机布置方式,分别对钢丝绳、提升机以及相关设备进行选型及校验,给出了提升系统最大班... 详细信息

为了解决磁西一号矿井副井临时提升能力较紧张实际情况,提人进风井进行临时提升系统改造,通过提出与比对两种改造方案,确定了选用落地式多绳摩擦提升机布置方式,分别对钢丝绳、提升机以及相关设备进行选型及校验,给出了提升系统最大班作业时间平衡表,计算结果表明设计的提升系统符合现行《煤矿安全规程》的相关规定,能够满足矿井安全生产需求。

关键词：提升系统钢丝绳选型及校验提升机