A study of water distribution from a branch to distributary canals: A case study of Gugera Branch,Punjab, Pakistan     

Muhammad Nawaz Bhutta  Muhammad Latif  Jacob W. Kijne 《Irrigation and Drainage Systems》1991,5(3):229-247

This study was conducted on Gugera Branch of Lower Chenab Canal, Punjab, Pakistan. Sample distributaries off taking from Gugera Branch were selected for the study. The existing conditions of water distribution among the distributaries were studied. Field data were collected during the whole of 1988. Field observations suggested that the variability at the head of distributaries is much greater than the variability in the Gugera Branch under existing operational practices. The distribution of water among the distributaries is rarely in accordance with design criteria. Some channels get priority over other channels. The annual closure period varied from 17 to 41 days for different channels. The discharge at the head of distributaries remained lower than the standard operational range for 69 to 183 days in a year. The data suggested that a regulating gate at the head of the distributary can reduce discharge variation up to 2.4 times compared with a Karrees System (wooden stop logs used for water regulation). The data indicated that the adjustments in the head gate of a distributary on daily basis can substantially improve discharge conditions at the head of distributary. Rotational schedules are not being followed as per design and need to be improved. Most of the existing head discharge relationships of discharge measuring structures are not reliable. A frequent calibration of these structures is recommended.  相似文献   

The action of phosphine against the eggs of phosphine-resistant and -susceptible strains of Rhyzopertha dominica F     

Rajendran S  Nayak KR  Anjum SS 《Pest management science》2001,57(5):422-426

The effect of phosphine at exposure periods of 24, 48 and 120 h on hatching and mortality of 0- to 1-day-old eggs of susceptible (TN6) and resistant (FC10) strains of Rhyzopertha dominica of field origin was investigated. The fumigant affected hatching in both the strains. In a 48-h exposure at 27 (+/- 2) degrees C, the LD99 doses for the eggs of TN6 and FC10 were 0.56 and 3.25 mg litre-1, respectively. Significant reduction in hatching was observed in treated batches with progressive increase of phosphine dose in the first 2-3 days. On subsequent days the numbers hatching were often similar to those in controls, and sometimes exceeded control hatch, especially following a 5-day exposure. A critical change in the order of susceptibility of egg and adult stages of the two strains was noticed. In 48-h exposures, eggs of the susceptible strain were more tolerant than their adults, whilst the reverse was true in the resistant strain.  相似文献   

Studies on Specific Inhibitors and Substrates of Cholinesterases of Fasciola gigantica from Cattle and Buffaloes     

M. S. Durrani  Muhammad Nawaz  N. I. Chaudhary 《Zoonoses and public health》1982,29(8):636-641

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Evaluation of cell wall preparations for proteomics: a new procedure for purifying cell walls from Arabidopsis hypocotyls     

Leila Feiz  Muhammad Irshad  Rafael F Pont-Lezica  Hervé Canut  Elisabeth Jamet 《Plant methods》2006,2(1):10-13

Background  

The ultimate goal of proteomic analysis of a cell compartment should be the exhaustive identification of resident proteins; excluding proteins from other cell compartments. Reaching such a goal closely depends on the reliability of the isolation procedure for the cell compartment of interest. Plant cell walls possess specific difficulties: (i) the lack of a surrounding membrane may result in the loss of cell wall proteins (CWP) during the isolation procedure, (ii) polysaccharide networks of cellulose, hemicelluloses and pectins form potential traps for contaminants such as intracellular proteins. Several reported procedures to isolate cell walls for proteomic analyses led to the isolation of a high proportion (more than 50%) of predicted intracellular proteins. Since isolated cell walls should hold secreted proteins, one can imagine alternative procedures to prepare cell walls containing a lower proportion of contaminant proteins.  相似文献   

Wheat Seed Presoaking for Improved Germination     

Shahbaz Ahmad  Muhammad Anwar  Hameed Ullah 《Journal of Agronomy and Crop Science》1998,181(2):125-127

Seed presoaking improves wheat germination under marginal moisture conditions. The duration of seed presoaking was studied at The University of Arid Agriculture, Rawalpindi, using 10 wheat varieties. Seed presoaking beyond 12 h does not improve germination further, and beyond 21 h, germination rate is drastically reduced.  相似文献   

Antibacterial compounds from the flowers of Alangium salviifolium   总被引：2，自引：0，他引：2  

Anjum A  Ekramul Haque M  Mukhlesur Rahman M  Sarker SD 《Fitoterapia》2002,73(6):526-528

1-Methyl-1H-pyrimidine-2,4-dione and 3-O-beta-D-glucopyranosyl-(24beta)-ethylcholesta-5,22,25-triene, isolated from the flowers of Alangium salviifolium, showed remarkable antibacterial activities against a number of Gram-positive and Gram-negative bacterial species.  相似文献   

Variations of growth,nitrogen accumulation and nitrogen use efficiency among 18 willow clones under two nitrogen regimes     

Weidong Yang  Zhiqiang Zhu  Fengliang Zhao  Zheli Ding  Muhammad Tariq Rafiq  Yuyan Wang  Xincheng Zhang  Xiaoe Yang 《Agroforestry Systems》2015,89(1):67-79

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枣实蝇对不同发育期骏枣和酸枣果实的生物学响应变化     

王洁  阿不都拉·艾克拜尔  阿地力·沙塔尔  李万倩  王琼 《新疆农业科学》2022,59(10):2524-2531

【目的】研究枣实蝇在寄主植物果实不同发育期的危害程度对其最佳防治期。【方法】分析枣园对不同寄主枣树样枝套袋枣实蝇的蛀果率,调查虫口密度;室内饲养测定果实不同发育期对枣实蝇生长发育和繁殖的影响,分析和评价枣实蝇对不同发育期骏枣和酸枣果实的生物学响应变化。【结果】枣实蝇对骏枣果实的蛀果率均大于对酸枣的蛀果率,并且枣实蝇在骏枣果实成熟期蛀果率为最大;成熟期骏枣上的虫口密度也最大;骏枣上雌虫产卵痕数、幼虫数和卵的孵化率均大于酸枣上的枣实蝇。在枣果着色期和成熟期,蛹的各项生长指标均高于膨大期;果实不同发育期,骏枣上的蛹各项生长指标均显著大于(P<0.05)酸枣上的;骏枣上枣实蝇的蛹期、雌虫怀卵量、性成熟历期、交配时间以及雌雄成虫寿命均略大于酸枣,但无显著差异(P>0.05)。【结论】枣实蝇对骏枣的选择性强于酸枣,并且成熟期的骏枣果实更适宜枣实蝇生长发育。  相似文献   

盐碱地白刺不同部位微生物群落高通量分析     

艾海白尔·卡斯木  樊永红  迪拉热·海米提 《新疆农业科学》2022,59(10):2562-2573

【目的】研究新疆盐碱环境中耐盐植物白刺的根际土壤和叶片内生微生物群落的结构丰富度和多样性。【方法】运用Novaseq测序平台对白刺根际土壤和叶片进行16SrDNA-V4区和ITS1区测序。经FLASH进行拼接,经过Qiim过滤叶绿体和线粒体序列,得到的序列在97%的序列相似性水平上聚类成为操作分类单元(OTUs)。对序列数据进行生物信息学分析,评价物种的Chao1指数、shannon指数以及Alpha多样性。【结果】白刺根际土壤细菌优势菌群为放线菌门(Actinobacteria)、变形菌门(Proteobacteria)、芽单胞菌门(Gemmatimonadetes);真菌优势菌群为子囊菌门(Ascomycota)。叶片内生细菌优势菌群为蓝细菌门(Cyanobacteria)和放线菌门(Actinobacteria);真菌优势菌群为子囊菌门(Ascomycota),白刺不同部位的微生物菌群数量和多样性有显著差异(P<0.05),白刺各样地之间微生物群落构成差异明显。【结论】白刺不同部位微生物群落的丰富度和多样性分布。  相似文献   

Abundance and richness of invertebrates in shade-grown versus sun-exposed coffee home gardens in Indonesia     

Campera  Marco  Budiadi  Budiadi  Bušina  Tomáš  Fathoni  Baladzuri Hafizh  Dermody  Janine  Nijman  Vincent  Imron  Muhammad Ali  Nekaris  K. A. I. 《Agroforestry Systems》2022,96(5-6):829-841

Agroforestry Systems - Complex agroforestry systems are suggested as a possible solution to reduce the effects of deforestation in the tropics while enhancing the livelihoods of local human...  相似文献