萝卜新品种热杂60的选育     

朱美容  张元才  乐正碧  黎华  徐茜  陈贵林 《长江蔬菜》2000,(10):41-43

萝卜新品种热杂６０以萝卜雄性不育系１２２５Ａ为母本，６０早９０－８－８－３－１３自交系为父本配制而成，肉质根近圆形，皮肉白色，生食脆嫩，煮食化渣味甜，具有耐热、早熟、抗病毒病、不易糠心等特点，一般６６７ｍ＾２产２５００ｋｇ左右，最高可达６０００ｋｇ以上。  相似文献   

Mn-SOD模拟物的合成及其SOD活性     

廖升荣  毛小云  何文芬  李小媚  乐学义 《勤云标准版测试》2008,(2)

合成了3个新的锰-超氧化物歧化酶(Mn-SOD)模拟物Mn(L-Leu)2(1),Mn(L-Val)2·3/2HCl(2)和Mn(L-Phe)2·HCl(3)(L-Leu=L-亮氨酸,L-Val-L-缬氨酸和L-Phe=L-苯丙氨酸).用元素分析、红外光谱对模拟物进行了表征.并用 NBT 光还原法检测了模拟物的SOD活性.结果表明3个模拟物均具有相对较高的类似于 SOD 催化超氧阴离子自由基(O2·-)歧化活性,抑制率为 50%时配合物的浓度,即一个活性单位值 IC50值分别为 0.311、0.274 和 0.378μmol/L.有望成为具有良好应用前景的新型 SOD 模拟物抗拟增产剂而应用于农业生产中.  相似文献   

Combined use of optical and radar satellite data for the detection of tillage and irrigation operations: Case study in Central Morocco     

R. Hadria  B. Duchemin  T. Le Toan  G. Dedieu 《Agricultural Water Management》2009,96(7):1120-1127

The objective of this study is to present a new application of optical and radar remote sensing with high spatial (∼10 m) and temporal (a few days) resolutions for the detection of tillage and irrigation operations. The analysis was performed for irrigated wheat crops in the semi-arid Tensift/Marrakech plain (Central Morocco) using three FORMOSAT-2 images and two ASAR images acquired within one week at the beginning of the 2005/2006 agricultural season.The approach we developed uses simple mapping algorithms (band thresholding and decision tree) for the characterisation of soil surface states. The first images acquired by FORMOSAT and ASAR were processed to classify fields into three main categories: ploughed (in depth), prepared to be sown (harrowed), and not ploughed-not harrowed. This information was combined with a change detection analysis based on multitemporal images to identify harrowing and irrigation operations which occurred between two satellite observations.The performance of the algorithm was evaluated using data related to land use and agricultural practices collected on 124 fields. The analysis shows that drastic changes of surface states caused by ploughing or irrigation are detected without ambiguity (consistency index of 96%). This study provided evidence that optical and radar data contain complementary information for the detection of agricultural operations at the beginning of agricultural season. This information could be useful in regional decision support systems to refine crop calendars and to improve prediction of crop water needs over large areas.  相似文献   

Characterization by gas chromatography/mass spectrometry of sterols in saccharomyces cerevisiae during autolysis.     

Y Le Fur  G Maume  M Feuillat  B F Maume 《Journal of agricultural and food chemistry》1999,47(7):2860-2864

Yeast autolysis affects membrane stability and induces a release of vacuolar enzymes into the cell cytoplasm. Consecutively, it was important to study the evolution of sterol content in Saccharomycescerevisiae for a fourteen day period of accelerated autolysis. Unesterified and esterified sterols were analyzed both in the biomass and in the autolysis medium. Ten sterols were identified by gas chromatography/mass spectrometry. A second group of six sterols was separated and partially characterized. Among the first group of 10 sterols, a dehydroergosterol was identified as ergosta-5, 7,9(11),22-tetraen-3beta-ol, not yet charaterized in S. cerevisiae. Yeast autolysis induced a decrease of esterified sterol content, especially first intermediates in the sequence of the ergosterol biosynthesis, as zymosterol. In contrast, the yeast autolysis resulted in the release of a low quantity of sterols into the medium. At the end of the fourteenth day of autolysis, 0.015% of the total sterol content of the initial biomass was found in the medium.  相似文献   

Fish genotype significantly influences susceptibility of juvenile rainbow trout, Oncorhynchus mykiss (Walbaum), to waterborne infection with infectious salmon anaemia virus     

Biacchesi S  Le Berre M  Le Guillou S  Benmansour A  Brémont M  Quillet E  Boudinot P 《Journal of fish diseases》2007,30(10):631-636

  相似文献   

基于层次分析法的节水型社会评价研究   总被引：1，自引：0，他引：1  

徐海洋  杜明侠  张大鹏  潘乐  姚宛艳  韩栋 《节水灌溉》2009,(7)

以郑州市为例,根据实际情况,建立了节水型社会定量评价指标体系,采用层次分析方法对建立的评价指标体系做了评价,计算得出,2010年将初步建立节水型社会,2020年将全面建成与小康社会相适应的节水型社会.  相似文献   

最大熵技术分析湖南汽车工业发展优序     

王道平  李树丕 《湖南农业大学学报(自然科学版)》1998,25(6)

运用最大熵技术对湖南汽车工业部分重点企业进行了优序分析，并以此为基础，探讨了湖南汽车工业应优先发展的产品，针对性地提出了加快发展湖南汽车工业的若干建议。  相似文献   

Adaptability of water-plant cultivated in different mediums     

DING Hua-qiao  LI Fang  CHEN Tian-tian  CHANG Le  WU Tie-ming 《湖南农业大学学报(自然科学版)》2008,34(6)

  相似文献   

Changes in fatty acid and sterol composition during oogenesis in the pearl oyster Pinctada margaritifera     

Isabelle Vahirua‐Lechat  Frédéric Laure  Jean René LeCoz  Jean Pierre Bianchini  Mereani Bellais  Gilles Le Moullac 《Aquaculture Research》2008,39(16):1739-1746

The fatty acid and sterol composition of the oyster Pinctada margaritifera during oogenesis and in eggs was analysed. No major differences were observed during oogenesis, but the egg composition was significantly different from that of gonads. The amount of saturated fatty acids was the highest in eggs and the C16:0 predominant (P<5%); by contrast, the amount of 22:6(n‐3) was significantly lower (P<5%) than in gonads. No major differences were observed for the polar lipid (PL) composition during oogenesis. The main free sterols in gonads and eggs were cholesterol and brassicasterol. Among free sterols, the proportion of cholesterol diminished continuously from the beginning to the end of gonad maturation, and this decrease persisted in eggs after spawning. Cholesterol represented 40% to 55% of the sterol ester encountered in gonad and eggs. This study allowed us to investigate the fatty acid and sterol composition during oogenesis of the pearl oyster P. margaritifera, leading to a clearer understanding of the nutritional requirements of pearl oyster during the reproduction process.  相似文献   

Effects of dietary highly unsaturated fatty acids and astaxanthin on the fecundity and lipid content of pond-reared Penaeus monodon (Fabricius) broodstock     

Jian-Hua Huang  Shi-Gui Jiang  Hei-Zhao Lin  Fa-Lin Zhou  & Le Ye 《Aquaculture Research》2008,39(3):240-251

Five diets that contained fresh squid meat as the basic constituent and were supplemented with different amounts of highly unsaturated fatty acids (HUFA) and astaxanthin were fed to pond‐reared Penaeus monodon broodstock. Diet A was sole squid meat. Diets B and C were supplemented with astaxanthin 50 and 100 mg kg^?1 respectively. Diets D and E were supplemented with HUFA 5 and 10 g kg^?1 and astaxanthin 50 mg kg^?1 respectively. The result showed that the group fed diet E had the best reproductive performance in all experimental groups. It had a higher proportion of spawns (71.5%), spawning rate (0.047), a shorter latency period (7.7±0.3 d), higher absolute fecundity (× 10³) (361.6±5.5) and egg production/female (× 10³) (597.0±18.0) than all the other experimental groups. The fatty acid composition in broodstock diets strongly affected the tissue and fecundity of broodstock. Good correlations between the content of 20:4n‐6 in eggs and the fecundity (r²=0.6109) and egg production (r²=0.9876) of broodstock were found. On the other hand, 22:6n‐3 and DHA/EPA ratio was negatively correlated with the fecundity of broodstock (r²=0.5362, 0.8702 respectively). The result also showed that the balance between n‐3 and n‐6 fatty acid families, total polyunsaturated fatty acids and total saturated fatty acid and 20:5n‐3 (EPA) and 22:6n‐3 (DHA) may play vital roles in maturation and reproductive performance of P. monodon broodstock.  相似文献