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1.
采用海水小球藻(Chlorella vulgaris)、面包酵母(Saccharomyces cerevisiae)和海水小球藻与面包酵母混合3种饵料对海水养殖鱼类育苗的常用饵料L-型褶皱臂尾轮虫(Brachionus plicatilis typycus)进行7天的培养,观察3种饵料对L-型褶皱臂尾轮虫的生长和繁殖的影响。研究表明:L-型褶皱臂尾轮虫的体宽在7天之内变动不大,各种饵料对L-型褶皱臂尾轮虫的体宽影响差异不显著;但对L-型褶皱臂尾轮虫密度的影响较大,一般于第4天开始显著增加。其中以混合组饵料培养的L-型褶皱臂尾轮虫密度最大,第7天可达到155个/ml;面包酵母组次之,小球藻组最少。此外,各种饵料对L-型褶皱臂尾轮虫的怀卵率有一定影响,其中以混合组的怀卵率最高,第3天达到70%,其次是面包酵母组,海水小球藻组最低。因此可采用海水小球藻与面包酵母混合培养L-型褶皱臂尾轮虫;在海水养殖鱼类育苗中,需提前3-4天培养轮虫,以提供充足的饵料。 相似文献
2.
动物泌乳受多种激素和因子的调节 ,除催乳激素 (PRL)外 ,还有生长激素 (GH)、胰岛素 (Insulin)、甲状腺素 (T3、T4)及胰岛素样生长因子 (IGF Ⅰ )等。通过对泌乳期二花脸猪和大白猪血浆GH、Insulin、T3、T4和IGF Ⅰ含量的比较 ,结果是大白猪 (LWS)血浆GH总体水平、基线水平、峰强度均高于二花脸猪 (EHS) ,分别高 1 9.84%、2 0 .5 4 %和 69.88% ,血浆Insulin、IGF Ⅰ均显著高于二花脸猪 (P <0 .0 5 ) ,分别高 5 0 .46%和 5 5 .45 % ,而二花脸猪血浆T3、T4显著高于大白猪 (P <0 .0 5 ) ,分别高 1 9.42 %和 1 7.89%。 相似文献
3.
8 0羽 2 1日龄罗曼蛋公鸡随机分成试验与对照两组 ,研究雏鸡在 2 1日龄人工感染E .tenella后第 1、2、3、4、5、6、7、8天鸡嗜酸性细胞的动态变化。结果表明 :感染E .tenella之后 ,试验组比对照组嗜酸性细胞明显增多 ,每日组间差异均极显著 (P <0 .0 1 ) ;在感染后第 1～6天 ,试验组日间差异不显著 (P >0 .0 5 ) ,在感染后第 6～ 7天 ,试验组日间差异极显著 (P <0 .0 1 ) ,而在感染后第 7～ 8天日间差异显著 (P <0 .0 5 )。 相似文献
4.
北草蜥繁殖期内产多窝卵,窝卵数2-5枚,相对窝卵重为0.163。窝卵数、窝卵重和卵重与雌体SVL呈显著的正相关。窝卵数与卵重间呈正相关;窝卵数与雌体SVL呈正相关;卵重与雌体SVL无相关性。卵长径与卵短径、窝卵数与卵长径、及窝卵数与卵短径间均无相关性。 相似文献
5.
选择 35日龄新西兰白兔 2 5只 ,随机分成A、B、C、D、E五组 ,A、B、C、D组为试验组 ,E组为对照组。试验组分别添加 0 .1 % ,0 .3%和 0 .5 %、0 .7%资源复合酶 ,研究不同水平的复合酶对断乳肉兔的生长性能的影响。结果表明 ,在饲料中添加复合酶制剂 ,试验组与对照组相比 ,试验组日增重分别提高 1 8.61 %、2 0 .73%、2 0 .95 %、2 0 .80 % ,经生物统计方差分析和SSR法多重比较 ,差异极显著 ,而组间差异不显著 ;料重比分别下降 2 6.2 7% (P <0 .0 1 )、 2 8.0 4 %(P <0 .0 1 )、2 9.1 7% (P <0 .0 1 )和 2 8.0 8% (P <0 .0 1 ) ,但组间差异不显著。试验组经济效益明显。 相似文献
6.
《中学生物学》2005,(12)
滇龙胆草是龙胆科多年生草本,高30～40cm,全株无毛,须根肉质,多数。茎直立,多分枝,斜向上,圆筒形,中空。单叶对生,近革质,椭圆形或卵状椭圆形,长2.5～5cm,宽1～2cm,先端钝锐尖,基部渐狭而互相连合成短鞘状。聚伞花序顶生或生于小枝顶端,花多数,较密集,小花柄较短;花冠紫红色,长2～3cm;萼钟形,先端5裂,萼筒长约8m m,萼裂片2大3小,大者长约12m m,小者长约5m m;花冠筒状钟形,径约2cm,先端5裂,裂片卵状椭圆形,长5～7m m,宽约5m m,先端急尖锐,褶偏斜,三角形;雄蕊5,着生于花冠筒近基部。花期8～9(～10)月,果熟期10～11月。花色鲜艳,花大、多而美丽… 相似文献
7.
2016年10月—2017年6月,在关中中部灌区的三原县采用两因素二次D饱和最优设计,研究了不同播期和种植密度对农大399小麦产量和品质的影响.结果表明:不同播期和密度对农大399小麦群体数量、个体质量、产量及其结构和籽粒品质均有显著的影响.同一播期,群体随着密度的增加而增加,叶龄、单株分蘖和次生根分别降低5. 4%～16. 9%、10. 7%～19. 2%和9. 8%～30. 4%,成穗数提高3. 9%～7. 0%,穗粒数降低0. 5%～0. 6%,千粒重提高3. 8%～6. 1%;增产1. 9%～8. 3%,籽粒蛋白质、湿面筋、稳定时间和沉降值分别提高3. 9%～9. 9%、6. 5%～11. 2%、14. 5%～16. 8%和2. 4%～12. 9%,其他品质指标变化不大.同一密度情况下,群体随着播期的推迟降低3. 6%～8. 8%,越冬期叶龄、单株分蘖和次生根均显著降低,个体质量显著变差;成穗数和穗粒数分别降低1. 1%～8. 9%和1. 1%～4. 5%,千粒重增加1. 9%-3. 8%,减产3. 7%-13. 6%;籽粒蛋白质、湿面筋、稳定时间和沉降值较早播依次降低2. 9%～7. 0%、3. 3%～5. 1%、12. 4%～18. 1%和1. 4%～6. 1%,但对籽粒面粉和拉伸品质指标影响不显著.当目标产量在8 250 kg/hm~2～9 750 kg/hm~2时,农大399适宜播种期为10月7日～10月15日,适宜播种密度为2. 30×106株/hm~2～2. 89×106株/hm~2. 相似文献
8.
选用健康的 36头“大×长×杜”仔猪 ,随机分为三组 ,不同来源的猪用预混料按 4 %的比例分别添加到各试验基础日粮中 ,试验期为 2 5天。结果表明三组仔猪的日增重依次为Ⅰ组 6 4 3G、Ⅱ组为 6 5 5G、Ⅲ组为 6 0 4G ,Ⅰ、Ⅱ组之间差异不显著 (P >0 0 5 ) ,Ⅰ、Ⅱ组与Ⅲ组间的差异显著 (P <0 0 1) ;三组仔猪的平均料重比分别为 198、196、2 14,增重 1KG分别消耗预混料成本 0 .6 1元、0 .5 2元和 0 5 1元 ,三组饲喂养效果以Ⅱ组仔猪的生长速度最快 ,Ⅲ组预混料成本最低 ,Ⅱ组的料重比低于Ⅲ组 ,日增重高于Ⅲ。 相似文献
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10.
利用本课题组研制的毛蛋粉代替进口鱼粉进行了仔鸡的饲养试验,试验选用本院牧场提供的1日龄AA肉雏400只,随机分为5组.0～4周龄各组日粮中的鱼粉含量(%)分别为6、4、2、1、0,毛蛋粉的含量(%)相应为0、1、2、4、6;5～8周龄各组日粮中的鱼粉含量(%)分别为4、3、2、1、0;毛蛋粉的含量(%)相应为0、1、2、3、4、.结果表明:4周龄、8周龄平均体重各试验组与对照组之间存在显著差异(P>0.05).多重比较(LSD法)结果表明;4周龄平均体重试验1、2组与对照组无显著差异,试验3、4组与对照组差异显著;8周龄平均体重除试验4组与对照组差异极显著外(P<0.1)其余各组与对照组之间均无显著差异(P<0.05 ). 相似文献
11.
黄州黄鳝体内寄生蠕虫的研究 总被引：1，自引：0，他引：1
剖检采自黄州陶店乡黄鳝60尾,新河乡黄鳝101尾,发现两地黄鳝体内寄生蠕虫种类的差别不大,但其感染率、感染强度有差别．两地黄鳝体内寄生蠕虫优势种均为隐藏新棘虫,常见种均为鳗鲡独孤吸虫及幼旋尾线虫未定种,稀有种均为大型多钩槽绦虫．隐藏新棘虫与幼旋尾线虫、隐藏新棘虫与鳗鲡独孤吸虫共染比例较高． 相似文献
12.
剖检采自黄州陶店乡黄鳝60尾,新河乡黄鳝101尾,发现两地黄鳝体内寄生蠕虫种类的差别不大,但其感染率、感染强度有差别,两地黄鳝体内寄生蠕虫优势种均为隐藏新棘虫,常见种均为鳗鲡独孤吸虫及幼旋尾线虫未定种,稀有种均为大型多钩槽绦虫,隐藏新棘虫与幼旋尾线虫、隐藏新棘虫与鳗鲡独孤吸虫共染比例较高, 相似文献
13.
Four colors (red, yellow, green, and blue) were arranged in all possible two-color sets to determine if goldfish can discriminate between color sets associated with shock and color sets associated with safety/shock omission in a one-phase (linear presentation) discrimination-learning procedure. The results showed that goldfish learned to discriminate between two-color sets if set colors were natural categorical color-code mates (red = yellow and green = blue). When natural code mates were not in the same set, and therefore were paired with different shock consequents, no discrimination learning occurred, suggesting that goldfish, unlike pigeons, are not able to code colors arbitrarily. The method also allowed a measure of preference between colors within sets associated with safety/shock omission. Original-learning preference measures between colors in sets so associated showed that goldfish chose red over any other color, yellow over blue or green, and green over blue, despite the fact that both colors in any set were procedurally identical, implying that goldfish do discriminate between colors in the absence of explicit discrimination training. The goldfish that failed to discriminate between red/blue and green/yellow sets in original learning were transferred to red/yellow and blue/green color sets. In transfer, the color paired with safety/shock omission in original learning was preferred over the color paired with shock in original learning, which resulted in a reversal of original-learning color preferences for half the goldfish. The transfer color-preference results imply that the goldfish had associated specific colors with specific shock consequents, but the associations were not robust enough to support discrimination learning in the face of categorical color coding. 相似文献
14.
李晓峰 《北京工业职业技术学院学报》2013,12(3):124-126
阐述了黄灯的产生与作用,指出黄灯使用中存在的系列问题,对取消黄灯的可行性和科学性进行了分析,提出了取消黄灯,实施绿灯3秒闪烁措施,可有效减少道路交叉路口事故隐患,保证路人及行车安全的建议. 相似文献
15.
随机选取某幼儿园126名4-6岁幼儿为研究对象,主要通过对幼儿的美术作品进行分析,辅之以对幼儿的美术活动进行观察的方法进行研究,发现:(1)4-6岁幼儿在美术作品中最偏好的颜色是红色和黄色,其次是蓝色、绿色、粉红、橙色、紫色、黑色。(2)不同年龄幼儿除了橙色没有显著性差异外,其余颜色均有显著性差异。(3)不同性别的幼儿在美术作品中对于色彩的偏好均有极其显著性差异(P0.001),男幼儿比女幼儿更喜欢黄色、蓝色,女幼儿比男幼儿更喜欢红色、粉色、橙色、紫色、绿色、黑色。 相似文献
16.
Chang Jianwei Xie Chong Wang Pei Gu Zhenxin Han Yongbin Yang Runqiang 《Journal of Zhejiang University. Science. B》2021,22(11):906-916
Journal of Zhejiang University-SCIENCE B - Red, white, blue, green, and yellow lights were applied to investigate their effects on folate accumulation in wheat seedlings. The different lights,... 相似文献
17.
Pigeons were trained on two independent tasks. One involved red and yellow hues, the other involved blue and green hues. For half of the birds, the two tasks were the same (i.e., both tasks were either matching-to-sample, or oddity-from-sample). For the remaining birds, the two tasks were different (i.e., one task was matching-to-sample; the other task was oddity-from-sample). Following acquisition, the pigeons were exposed to test trials on which either the correct or the incorrect comparison hue was replaced with one of the hues from the other task. On yellow-sample trials and on green-sample trials, the pigeons performed as if they had a common code for yellow and green. When there was one comparison available that was appropriate to the “yellow/green” code, performance remained high; but when either both comparisons or neither comparison was appropriate to the “yellow/green” code, performance dropped. The pigeons also tended to code red samples as green and to code blue samples as yellow. The results indicate that pigeons can categorically code colors under conditions that rule out a failure to discriminate among the colors. 相似文献
18.
D. J. Zerbolio 《Learning & behavior》1985,13(3):269-273
Goldfish, trained in the shuttlebox apparatus to avoid shock, acquired a color discrimination between two colors (red/green) and were tested in transfer with a new set of colors (yellow/blue). Transfer color shock-pairing was either consistent with (red=yellow, blue=green) or opposite to (red≠ yellow, green≠blue) categorical color coding seen in pigeons. Groups with transfer shock-pairing consistent with categorical color coding showed positive transfer, and groups with transfer shock-pairing opposite to categorical color coding showed negative transfer, similar to an attenuated reversal learning effect. These results indicate that goldfish, like pigeons, code different colors as behavioral equivalents even though they can easily learn to discriminate between them. As with pigeons, the finding of the categorical color coding phenomenon changes the conclusions drawn from earlier goldfish conditional-discrimination transfer studies using only signal color changes between acquisition and transfer testing, from evidence of concept learning to evidence for categorical color coding, on the grounds of parsimony. It is important to note that this finding affects only the explanation of conditional-discrimination transfer effects, and the fact remains that both pigeons and goldfish can learn to conditionally discriminate—pigeons for positive reinforcement, and goldfish to avoid shock. 相似文献
19.
贾文荣 《河北能源职业技术学院学报》2005,5(4):69-70
反光道岔显示器（B型）,利用扳道器拨叉的转动,带动显示器箱体内指示牌上下移动,进而显示出黄色、绿色信号,使得司机在60米外就能清晰观测到道岔直道、弯道状态,对避免窜道现象的发生有着重要意义。 相似文献
20.
万连增 《湖北第二师范学院学报》2012,(12):17-20
绘画艺术中,绿色由蓝色和黄色调制而成,本文从文化解读的视角,详细分析了《了不起的盖茨比》中绿、黄、蓝三种颜色的文化内涵及其对小说人物命运塑造的作用,揭示菲茨杰拉德对西方色彩文化的精湛运用,以及小说细节安排的精妙之处。 相似文献