检索结果-南通市图书馆

Prediction of chemical composition for callus production in Gyrinops walla Gaetner through machine learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2020年第4期7卷 511-522页

作者： Sachithri P.Munasinghe Seneviratnege somaratne Shyama R.Weerakoon Chandani Ranasinghe Department of Botany The Open University of Sri LankaP.O.Box 21NawalaNugegoda 10250Sri Lanka Department of Chemistry The Open University of Sri LankaP.O.Box 21NawalaNugegoda 10250Sri Lanka

Developing new tissue culture protocols and optimization of plant media composition for particular plant species are precluded by the higher labor,time and *** usage of machine learning becomes rewarding tools for efficient,cost-effective method of optimization of growth media composition for desires growth *** are often encountered in determination of media composition for raising calli from explants of woody Gyrinops *** paper provides the finding of the study performed on modeling and optimization of chemical composition of culture media for raising callus from explants of *** of experiments were conducted to raise calli from sterilized leaf and node explants with varying concentrations of 1-Naphthaleneacetic acid(NAA),6-Benzylaminopurine(BAP)and coconut water in Murashige and Skoog medium(MSM)and Woody plant medium(WPM)were *** Neural Networks(ANNs)were developed to predict the best media composition on callus weight(CW),callus induction percentage(CIP)and days taken to initiate callus(DC).Callus formation was observed in all the experiments except for *** ANN models were developed to predict the best media composition for CW,CIP and *** results of ANN models predict optimum media composition during the training,validation and testing with satisfactory levels of *** R2 values of the best ANN models;CWnet,CIPnet and DCnet were 0.95,0.95 and 0.88 *** mean sums of square errors(RMSRs)of CWnet,CIPnet and DCnet were 0.1410,0.1391 and 0.1961 and mean residual(MRs)were 0.0199,0.0194 and *** corrected Akaike information criterion(AICc)of the models was331.431,254.926 and210.777,and Schwarz Bayesian information criterion(SBC)were490.495,454.229 and*** predicted best media consisting MSM+3.0 mg/l NAA+0.5 mg/l BAP and MSM+1.5 mg/l NAA+0.5 mg/l BAP were the optimum combination for leaves and nodal explants *** AICc and SBC of CWnet indicated

关键词： Gyrinops walla Gaetner Tissue culture Coconut water Woody plant Artificial neural network

Developing herbicide resistant Sri-lankan rice(Oryza sativa L.)varieties:An application of Self Organizing Map

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2017年第2期4卷 140-149页

作者： E.M.S.I.Ekanayaka S.R.Weerakoon S.somaratne O.V.D.S.J.Weerasena Department of Botany The Open University of Sri LankaP.O.Box 21NawalaSri Lanka Institutes of Biochemistry Molecular Biology and BiotechnologyUniversity of ColomboSri Lanka

Application of high concentrations of post-emergent broad spectrum systemic herbicide,glyphosate is prevalently used to control rice weeds in Asian countries including Sri *** target movements of glyphosate adversely affect growth of the rice plant reducing the *** herbicide resistance(HR)in cultivated rice is a novel approach to enhance selectivity and crop *** on induced HR in Sri Lankan rice varieties are limited and studies are required to include HR rice in a cropping *** Methyl Sulfonate(EMS),a chemical mutagen is used for functional *** present study is an attempt of raising HR rice lines through conventional breeding methods.A suitable glyphosate concentration was determined by a preliminary study using five rice varieties(Bg300,Bg352,At362,Bg379-2 and H4)and varying glyphosate concentrations(0.25 g/l,0.5 g/l,1 g/l,2 g/l and 3 g/l).Resistance percentage50%was arbitrary considered as resistant *** Randomized Design with three replicates was used in the *** characters were recorded for the survived *** varieties(Bg359,At362,Bw364,Ld365,Bg366,Bg369,Bg379-2,Bg403,Bg454“Pachcha perumal”,“Kalu heenati”and“Kurulu thuda”)showed natural resistance to glyphosate and fourteen varieties have increased resistance after mutagenesis by EMS(S0-First generation).HR resistance percentage of S1(Second generation)plants was similar to S0 plants indicating HR was transferred to new *** statistics was supplemented with Self-Organizing Maps(SOM)to visualize variation of agro-morphological characters under *** result proved that EMS application is an effective method in breeding new rice germplasm with HR and SOM is an important tool for visualizing the multi-dimensional dataset in lower dimensions.

关键词： Ethyl Methyl Sulfonate Glyphosate Herbicide resistance Oryza sativa Self-Organizing Map

Geological Control upon Groundwater Flow and Major Ion Chemistry with Influence on Basin Management in a Coastal Aquifer, South Australia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2013年第12期5卷 1170-1177页

作者： Nara somaratne Jacqueline Frizenschaf South Australian Water Corporation 250 Victoria Square Adelaide Australia

Estimation of natural recharge and potential for seawater intrusion are critical considerations for management of coastal freshwater aquifers. We show hydrochemical signatures of groundwater to identify the influence of geological control on chemical processes in a coastal groundwater system. We used dominant hydrochemical facies, salinity and magnesium ions to determine two main groundwater flow paths with different origins and ages. Mixing of groundwater with different origins and ages results in unreliable recharge estimates using chlorofluorocarbon (CFC) and chloride mass balance (CMB) methods, thus limiting available methods for recharge assessment. Interpretation of hydrochemical data suggests that calcium carbonate dissolution, ion exchange processes and mixing with sea aerosol in coastal zones are the main influencing factors on groundwater chemistry. Restricted groundwater flows due to occurrence of a basement high at the southern side of the basin boundary influence the distance to the toe of the saline wedge. Thus, knowledge of geological control over groundwater systems forms an important part of characterising basins and contributes toward effective management of groundwater resources.

关键词： Hydrochemistry Groundwater Mixing Groundwater Management Recharge

A Heuristic Approach to Estimating Spatial Variability of Vertical Leakage in the Recharge Zone of the Gambier Basin Tertiary Confined Sand Aquifer, South Australia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2016年第2期8卷 183-200页

作者： Nara somaratne Jeff Lawson Saad Mustafa South Australian Water Corporation Adelaide South Australia Department of Environment Water and Natural Resources Mount Gambier South Australia

The vertical leakage to confined aquifers is rarely quantified in complex settings, where the recharge zone is characterized by both diffuse and preferential flows. In such setting, conventional hydraulic or tracer based estimation of recharge or vertical leakage is problematic, unless the effects of duality of flow regimes are considered. A water balance approach by the use of calibrated groundwater models can be used, as the mass balance is independent of the particular mode of recharge and vertical leakage processes. Here, we adopt a water balance approach to provide a first order assessment of recharge to the unconfined Tertiary limestone aquifer (TLA) and vertical leakage to the Tertiary confined sand aquifer (TCSA) within the Glencoe-Nangwarry-Nagwarry (GNN) recharge zone of the Gambier Basin in South Australia. Despite many studies expressing concern about the impact of land use on recharge to the TLA and vertical leakage to the TCSA, no estimates have been made to quantify the vertical leakage within the GNN recharge zone. In the GNN recharge zone, relatively high recharge to the unconfined aquifer and vertical leakage to the confined aquifer occurs as a result of both diffuse and preferential flow processes. This is due to presence of structural faults and thin or absent aquitard. Within the Hundred of Nangwarry, where 83% of the area is covered with plantation forest, the model calculated recharge to the TLA of 80 mm·year-1, about 44% reduction compared to adjacent non-forested area (144 mm·year-1). Vertical leakage to the TCSA within the Hundred of Nangwarry area is higher (84.5 mm·year-1) than recharge to the TLA. Higher vertical leakage combined with the reduced recharge to TLA resulted in depletion of the TLA storage, as evidenced by drying of the TLA at one locality. In contrast, in plantation forest areas where diffuse recharge is the dominant process (Hundred of Penola), recharge to the TLA is about 19 mm·year-1

关键词： Gambier Basin Confined Aquifer Preferential Flows Vertical Leakage Groundwater Models Groundwater Management

Recharge to Blue Lake and Strategies for Water Security Planning, Mount Gambier, South Australia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2014年第8期6卷 772-783页

作者： Nara somaratne Jeff Lawson Glyn Ashman Kien Nguyen Department of Environment Water and Natural Resources Mount Gambier Australia Hydraulic Works and Management Division Directorate of Water Resources Ministry of Agriculture and Rural Development Hanoi Vietnam South Australian Water Corporation Adelaide Australia

Blue Lake, a volcanic crater provides municipal water supply to the city of Mount Gambier, population of 26,000. Current average annual pumping from the lake is 3.6 × 106 m3. The lake is fed by karstic unconfined Gambier Limestone aquifer. Storm water of the city discharges to the aquifer via about 400 drainage wells and three large sinkholes. Average annual storm water discharge is estimated at approximately 6.6 × 106 m3 through drainage wells and sinkholes within 16.8 km2 of the central part of the city. Chemical mass balance for calcium was used to estimate groundwater inflow to the lake at 6.3 × 106 m3, almost equal to the volume of storm water discharge and slightly higher than the previous estimates using environmental isotopes (4.8 - 6.0 × 106 m3). Considering the lake outflow volume of 2.7 × 106 m3, the net inflow to the lake equates to the current annual pumping and therefore it is considered that the current pumping rate is at the upper limit. For meeting the short-term future demand, confined aquifer water may be used and in the longerterm, an additional well field is required outside the Blue Lake capture zone, preferably to the north-east of the city. For water supply security, inflow to the lake along with water quality has to be maintained within the city. Current annual private abstraction within the capture zone is about 4.4 × 106 m3 and in order to maintain aquifer water levels, no additional allocation should be allowed.

关键词： Blue Lake Recharge Water Security Planning Groundwater Water Resource Management

Estimating Out-Crossing Rate of Bg 379-2 Using Morphological Markers and Confirmation by Molecular Markers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rice science 2012年第2期19卷 166-168页

作者： L.H.M.Y.K.somaratne A.S.M.T.ABAYAWICKRAMA I.P.WICKRAMASINGHE W.L.G.SAMARASINGHE Department of Agricultural Biology Faculty of AgricultureUniversity of PeradeniyaSri Lanka Rice Research and Development Institute BatalagodaIbbagamuwaSri Lanka

Rice is largely self-fertilized and accordingly a field population of rice is completely composed of near homozygotes. Due to the emergence of off-types, homozygosity will be affected. With the time, this will cause the reduction of genetic purity in some rice varieties. One of the reasons has been suspected to be the high out-crossing frequencies of such varieties. Studies were conducted at the Rice Research and Development Institute, Batalagoda, Sri Lanka to estimate the out-crossing rate of Bg 379-2, a variety having the problem of maintaining genetic purity. Bg 379-2 was allowed to out-cross with Bg 450 and the number of out- crossed plants were counted using dominant morphological markers such as short-round grain and purple culm of pollen donor. A molecular confirmation of out-crossing was also performed using sequence tagged site （STS） molecular marker pTA248. The variety Bg 379-2 showed a potential out-crossing rate of 3.41% and an average out-crossing rate of 1.29% using dominant morphological markers. Polymorphism was cleady detected between parents and out-crossed plants as well as selfed plants of Bg 379-2 using their banding patterns. A similar study can be performed to determine the out-crossing rates of other varieties which show high percentage of off-types in the population for the better understanding of the breeding behavior of the varieties.

关键词： rice genetic purity out-crossing marker polymorphism

斯里兰卡当地芥菜(Brassica juncea)的鉴定及其营养品质的改良(英文)

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

斯里兰卡当地芥菜(Brassica juncea)的鉴定及其营养品质的改良(英...

前蛋白转化酶枯草溶菌素9变异、低密度脂蛋白胆固醇与神经认知功能损害的关系

第十二届国际油菜大会

作者： S R Weerakoon M C M Iqbal S somaratne P K D Peiris W S R Wimalasuriya Department of Botany The Open UniversityNawalaSri Lanka Plant Reproductive Biology Division Institute of Fundamental StudiesKandySri Lanka

芥菜(Brassica juncea)作为油料作物生长在印地安次大陆有几百年历史,然而在斯里兰卡,芥菜生产相对较晚。它被广泛用作为调味品并且油是用于Ayurvedic药中。在斯里兰卡有60份芥菜资源,然而它们的遗传多样性和相互关系还没有研究。本研... 详细信息

芥菜(Brassica juncea)作为油料作物生长在印地安次大陆有几百年历史,然而在斯里兰卡,芥菜生产相对较晚。它被广泛用作为调味品并且油是用于Ayurvedic药中。在斯里兰卡有60份芥菜资源,然而它们的遗传多样性和相互关系还没有研究。本研究的目的是评估当地芥菜的遗传差异,通过对其农艺性状的数学分析来界定和证实其遗传差异和农业的优势近源种。筛选了30份芥菜资源并测定35个农艺性状。数据采用不同的多参数统计程序:聚类分析、主要组分分析原理(PCA)和判别式功能分析(DFA)。聚类、PCA和DFA的表明结果显示芥菜变种有不同的组型。因而,怀疑用形态特征界定芥菜变种是否适合。因此,本研究认为考虑其他的信息源如生化证据和分子标记来证明芥菜变种。当地芥菜的不受欢迎的脂肪酸(芥酸)的含量高,受欢迎的脂肪酸(芥酸)的含量低。高水平芥酸对心肌有不良影响,商业油菜canola品种因其含单不饱和油而在营养上受亲睐。6种澳大利亚商业春性canola品种和6个当地芥菜品种相互杂交,已成功培育F1代杂种。通过使用改良的Lichter medium(1982)培养基进行胚培养获得了F1再生植株,这样克服了萌发后屏障。所有杂交F1代种子用气相色谱进行脂肪酸的分析显示其适量的芥酸(18%1%)而对照芥菜为44%6%,甘蓝型油菜为0.2%.5%。F1杂种油酸提高(33%1%)而对照芥菜(7%%)和甘蓝型油菜(43%7%)。本研究清楚说明了一些特性如高水平油酸和低水平芥酸是可能从canola转移到芥菜中的,并通过种间杂交生产新的具改良的脂肪酸组分的芥菜品系。

关键词： mustard accessions morphology fatty acid profile CA PCA DFA interspecific hybridization Sri Lanka

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

中华高血压杂志 2017年第12期25卷 1103-1103页

作者：黄洁叶鹏 Mefford MT Rosenson RS Cushman M Farkouh ME McClure LA Wadley VG Irvin MR Bittner VA Safford MM somaratne R Monda KL Muntner P Levitan EB

尽管之前的研究引发了对抑制前蛋白转化酶枯草溶菌素9（proprotein convertase subtilisin／kexintype9，PCSK9）造成神经认知功能损害事件的关注，但近期一个第3期随机试验并没有发现药物性PCSK9抑制与神经认知损害有关。

关键词：神经认知功能低密度脂蛋白胆固醇认知功能损害溶菌素转化酶前蛋白变异损害事件