辛亥革命前后张謇与袁世凯的交往     

王志军  王瑞芳 《信阳农业高等专科学校学报》2005,15(4):51-54

张謇与袁世凯的交往长达三十余年,他从最初的相识荐袁、拥袁合作、相互借重到后来的分离,张謇曾幻想依靠袁世凯实现自己“实业救国”的抱负,却以失败而告终。二人分分合合,充满波折的交往过程反映了中国近代资本主义发展的艰难与坎坷。  相似文献   

中国草鱼和泰国草鱼利用牧草作食饵的比较     

邵庆均 《浙江大学学报(农业与生命科学版)》1995,(1)

通过对中国草鱼（Ｃｔｅｎｏｐｈａｒｙｎｇｏｄｏｎｉｄｅｌｌａ）和泰国草鱼（Ｐｕｎｔｉｕｓｇｏｎｉｏｎｏｔｕｓ）分别在常规的尼罗罗非鱼（Ｏｒｅｃｈｒｏｍｉｓ，ｎｉｌｏｔｉｃｕｓ）、鲤鱼（Ｃｙｐｒｉｎｕｓｃａｒｐｉｏ）和黑鱼（Ｃｈａｎｎａｓｔｒｉａｔａ）混养体系中养殖７个月，比较两者对牧草（Ｂｒａｃｈｉａｒｉａｍｕｔｉｃａ）的利用效果。试验结果表明，中国草鱼与泰国草鱼相比，无论是每尾体重，还是每尾体长、平均每尾日增重都有明显优势（Ｐ＜０．０５）．而且，放养３个月后，中国草鱼每尾体重和每尾日增重均极显著地优于泰国草鱼（Ｐ＜０．０１）．中国草鱼和泰国草鱼的年产量分别为２１８６ｋｇ／ｈｍ￣２，１２３３ｋｇ／ｈｍ￣２．中国草鱼的成活率比泰国草鱼低，两者分别为３８％和８６％。  相似文献   

银皖鲫生物学的初步研究     

王世恒  杜刚  祝景怀  金长勋  屈艳阳  任秀苹 《水产学杂志》2004,17(1):42-45

银皖鲫是以方正银鲫作母本，草鱼作父本，进行远缘杂交培育的新型鲫鱼品种，具有适应性强、生长快、食性广、易饲养、耐低氧、抗病力强等特点，是池塘养殖的优良品种。  相似文献   

Comparison of phenolic profiles and antioxidant activities in skins and pulps of eleven grape cultivars(Vitis vinifera L.)     

Fu-xiang LI  Fu-hua LI  Ya-xuan YANG  Ran YIN  Jian MING 《农业科学学报》2019,18(5):1148-1158

Eleven grape cultivars were analysed to explore the variety differences of fresh grape phenolic profiles. The results showed that free phenolics were predominant in grape skins and pulps, and showed the higher antioxidant activities than bound. In 11 cultivars, Muscat Kyoho extracts had the highest total phenolic content in skins(10.525 mg GAE g~(–1) FW) and pulps(1.134 mg GAE g~(–1) FW), and exhibited the highest DPPH radical scavening capacity(EC_(50)=11.7 μg mL~(–1)) and oxygen radical absorbance capacity(ORAC) value(190.57 μmol TE g~(–1) FW) of free phenolic in skin. In addition, the most abundant phenolics in grape skins were found to be flavonoids such as kaempferol in Kyoho skin(541.2 μg g~(–1) FW), rutin, catechin and epicatechin in Muscat Kyoho skin(262.3, 86.3 and 70.0 μg g~(–1) FW, respectively). Furthermore, the principal component analysis showed a strong difference of phenolic profiles with the cultivars, existing forms and distributions. Pearson correlation coefficient analysis showed a significant linear correlation between total phenolic content and antioxidant activity(P0.05). Therefore, both skins and pulps were rich sources of bioactive phenolic compounds, and Muscat Kyoho was the ideal source among all samples.  相似文献   

氨氮胁迫对四鼻须鲤鱼肝脏GST酶活力的影响     

刘洋  凌去非  王磊  王大鹏  佟广军 《水产养殖》2011,32(7):13-15

实验采用生态毒理学方法,以NH4Cl为实验药物,设置0、50、150和250mg/L实验浓度。通过对野生和养殖群体的四鼻须鲤鱼氨氮对肝脏谷胱甘肽巯基转移酶（GST）活力的影响,比较两个群体抗氨氮能力。结果表明：在相同的氨氮浓度和胁迫时间下,四鼻须鲤鱼养殖群体GST酶活力的变化趋势与野生群体大致相同。除250mg/L浓度组在胁迫5d和10d时,野生群体酶活性略低于养殖群体外,在其余时间点的野生群体酶活性均高于养殖群体,而且,在高浓度氨氮胁迫下,野生群体肝脏的GST酶活性达到峰值的时间比养殖群体更短,显示出较强的抗氨氮能力。  相似文献   

虎杖提取物对CCl4诱导建鲤损伤肝细胞生化指标的影响     

杜金梁  贾睿  曹丽萍  殷国俊 《湖南农业大学学报(自然科学版)》2013,39(4):413-418

为探明虎杖对鱼类损伤肝细胞是否具有修复作用，分离建鲤肝细胞，设6个试验组：I组(空白对照组)；II组(CCl4模型组)；III组(800 μg/mL虎杖提取物对照组)；IV组(造模前200、400、800 μg/mL虎杖提取物处理组)；V组(造模后200、400、800 μg/mL虎杖提取物处理组)；VI组(造模前、后200、400、800 μg/mL虎杖提取物处理组)。各组细胞经处理后继续培养12 h，收集肝细胞培养液，检测上清培养液中丙氨酸转氨酶(GPT)、天冬氨酸转氨酶(GOT)、乳酸脱氢酶(LDH)、超氧化物歧化酶(SOD)等酶活性，丙二醛(MDA)含量及肝细胞的存活率。结果表明：III组肝细胞培养液中GOT、GPT、LDH、SOD、MDA值及细胞存活率与I组相比无明显变化(P＞0.05)，说明800 μg/mL虎杖提取物没有细胞毒性，可用于后续试验；与II组相比，IV组中800 μg/mL虎杖提取物处理组的效果优于其他2个浓度组，可以极显著降低培养液中GOT值(P<0.01)，显著降低培养液中GPT、LDH值(P<0.05)，显著提高肝细胞的存活率(P<0.05)，而MDA含量和SOD值差异无统计学意义(P＞0.05)；与II组相比，V组中400 μg/mL虎杖提取物效果优于其他2个浓度组，可以极显著降低培养液中GOT值(P<0.01)，显著降低培养液中LDH值(P<0.05)，显著提高肝细胞的存活率(P<0.05)，但GPT值、MDA含量、SOD的差异无统计学意义(P＞0.05)；与II组相比，VI组中800 μg/mL虎杖提取物效果优于其他2个浓度组，能极显著降低培养液中GOT、GPT、LDH在肝细胞中的释放(P<0.01)，显著降低培养液中MDA含量(P<0.05)，显著提高肝细胞的存活率(P<0.05)。综合以上结果，以VI组中800 μg/mL的虎杖提取物效果最好，能有效抑制CCl4所造成的肝细胞损伤，其机制可能与其抗氧化作用有关。  相似文献   

Sulfadiazine pharmacokinetics in grass carp (Ctenopharyngodon idellus) receiving oral and intravenous administrations     

Ning Xu  Yu Fu  Fang Chen  Yongtao Liu  Jing Dong  Yibin Yang  Shun Zhou  Qiuhong Yang  Xiaohui Ai 《Journal of veterinary pharmacology and therapeutics》2021,44(1):86-92

This study aimed to examine the bioavailability (BA) and pharmacokinetic (PK) characteristics of sulfadiazine (SDZ) in grass carp (Ctenopharyngodon idellus) after oral and intravenous administrations. Blood samples were collected at predetermined time points of 0.083, 0.17, 0.5, 1, 2, 4, 8, 16, 24, 48, 72, and 96 hr (n = 6). The samples were extracted and purified by organic reagents and determined by the ultra‐performance liquid chromatography. The software named 3P97 was used to calculate relevant PK parameters. The results demonstrated that the concentration–time profile of SDZ was best described by a one‐compartmental open model with first‐order absorption after a single oral dose. The main PK parameters of the absorption rate constant (K_α), the absorption half‐life (t_{1/2 Kα}), the elimination rate constant (K_e), the elimination half‐life (t_1/2Ke), and the area under concentration–time profile (AUC_0‐∞) were 0.3 1/h, 2.29 hr, 0.039 1/h, 17.64 hr, and 855.78 mg.h/L, respectively. Following intravenous administration, the concentration–time curve fitted to a two‐compartmental open model without absorption. The primary PK parameters of the distribution rate constant (α), the elimination rate constant (β), the distribution half‐life (t_1/2α), the elimination half‐life (t_1/2β), the apparent distribution volume (V_SS), the total clearance (CL), and AUC_0‐∞ were 9.62 1/hr, 0.039 1/hr, 0.072 hr, 17.71 hr, 0.33 L/kg, 0.013 L h^?1 kg^?1, and 386.23 mg.h/L, respectively. Finally, the BA was calculated to be 22.16%. Overall, this study will provide some fundamental information on PK properties in the development of a new formulation SDZ in the future and is partially beneficial for the appropriate usage of SDZ in aquaculture.  相似文献   

双低菜籽粕对草鱼和鲤甲状腺、肝、肾组织结构的影响   总被引：1，自引：0，他引：1  

吴志新  覃江凤  陈孝煊  刘明典  史则超  彭健 《华中农业大学学报》2006,25(4):426-430

以组织学方法,研究了投喂不同含量双低菜籽粕对草鱼和鲤甲状腺、肝、肾组织的影响。结果表明:在试验的前28 d,双低菜籽粕各不同含量的日粮(17%、34%、51%、68%)对草鱼甲状腺、肝脏组织没有影响,但菜籽粕含量为68%的试验组草鱼肾小管上皮出现颗粒变性。第42天后,菜籽粕含量为68%的试验组草鱼甲状腺滤泡上皮轻度增生,滤泡结构不规则;菜籽粕含量等于或大于51%的试验组草鱼肝脏出现颗粒变性和空泡变性,肾小球有透明变性,肾脏轻度淤血。在试验的第28天,双低菜籽粕含量等于或大于52.2%的试验组鲤甲状腺滤泡上皮细胞的高度增加,肝细胞空泡变性,有轻微的肾小球透明变性。第42天后菜籽粕含量等于或大于34.8%的试验组鲤甲状腺滤泡上皮细胞的高度增加,滤泡胶质的边缘出现缺刻;肝脏出现淤血,部分肝细胞坏死;肾小球透明变性,肾脏淤血。  相似文献   

谷氨酸铜对罗非鱼和草鱼生长性能血清生化指标和体组成的影响     

李云峰  覃宗华  彭险峰  丁丽  唐娇  欧阳燕媚  肖灿 《中国饲料》2013,(18)

为研究谷氨酸铜制剂对罗非鱼、草鱼的生长性能、血清生化指标和鱼体组成的影响，选用180尾罗非鱼、135尾草鱼，分别随机分为3个处理组，每组3个重复，每个重复20或15尾。在基础饲料中添加五水硫酸铜作为对照组（10 mg/kg），试验组添加谷氨酸铜（高、低剂量组分别为10、5 mg/kg，按铜离子计），饲养8周。结果表明：与对照组相比，谷氨酸铜高、低剂量组罗非鱼的增重率分别提高3.9%和5.8%，草鱼的增重率分别提高4.0%和5.9%；罗非鱼特定生长率分别提高1.9%和3.3%，草鱼分别提高2.5%和3.5%；罗非鱼和草鱼的平均饵料系数分别降低7.6%和3.7%。两种鱼的血清生化指标及体组成各试验组间均无显著差别（P＞0.05）。由此可见，日粮中添加适量谷氨酸铜可提高鱼体的生长性能，且效果优于五水硫酸铜。  相似文献   

Spatial variability of common carp populations in relation to lake morphology and physicochemical parameters in the upper Midwest United States     

M. J. Weber  M. L. Brown  D. W. Willis 《Ecology of Freshwater Fish》2010,19(4):555-565

Weber MJ, Brown ML, Willis DW. Spatial variability of common carp populations in relation to lake morphology and physicochemical parameters in the upper Midwest United States.
Ecology of Freshwater Fish 2010: 19: 555–565. © 2010 John Wiley & Sons A/S Abstract – Common carp (Cyprinus carpio) is a widespread invasive species that is tolerant of a wide range of environmental conditions. Despite the circumpolar distribution of the species, limited information is available describing factors related to spatial variation in population characteristics. Eighty‐four lakes and impoundments in the upper Midwest United States were sampled to investigate the relationships of common carp relative abundance with size structure, condition and growth rates. We also investigated abiotic factors (lake morphology, physical solids and water quality) that may broadly influence common carp populations. Common carp size structure and condition were inversely related to relative abundance. Common carp relative abundance increased and size structure shifted to smaller individuals with increased lake depth, whereas lake surface area, watershed:surface area ratio and physical solids were also important in explaining common carp abundance and size structure. Common carp condition was best explained by water quality parameters and increased with metrics of lake productivity. We conclude that knowledge of factors associated with variation in common carp populations among lakes provides insights into the autecology and broad provisions for management of this generalist invasive species.  相似文献