检索结果-南通市图书馆

^14CO2 Fixation and Translocation of Photoassimilates as Selection Criteria of Egyptian Taro Genotypes

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 Integrative Plant Biology 2006年第5期48卷 563-566页

作者： Helal Ragab Moussa Afaf Abd ei-Kader Salem Radioisotopes Department Atomic Energy Authority Cairo Egypt Horticultural Research Institute Agriculture Research Center Giza Egypt

The growth characterlstlcs, different physlological parameters, photosynthetic activity （^14CO2 fixation）, and the translocatlon rate of photoassimllates In different taro （Colocasia esculenta L. Schott） genotypes was studled In order to determlne the posslble use of these parameters as selectlon crlterla for dlfferent wldely used genotypes of taro （Delta No. 9, 15, 20, 21, and balady）. The results obtalned suggest that Delta No. 21 shows the most slgnlflcant increase In all parameters tested compared wlth the control （balady）, followed by Delta No. 9, 15, and 20, respectively. The results show a positive correlation between photosynthetlc actlvlty, translocatlon efflclency, and total yield. The selected clone Delta No. 21 Is recommended for cultlvatlon In the delta reglon of Egypt.

关键词： ^14CO2 fixation taro (Colocasia esculenta) translocation rate.

不同类型橡胶园间作对竹芋生产力、经济效益和净温室气体排放的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

西南农业学报 2024年第6期37卷 1239-1246页

作者：黄坚雄魏元姁董天站潘剑王秀全中国热带农业科学院橡胶研究所海口570102 省部共建国家重点实验室培育基地-海南省热带作物栽培生理学重点实验室海口571101 农业农村部儋州热带作物科学观测试验站海南詹州571737 中国农业大学三亚研究院海南三亚572025

【目的】构建和发展橡胶农林复合模式提高综合产出和生态效益,为保障海南省天然橡胶种植业可持续发展提供参考。【方法】以淀粉作物竹芋(Maranta arundinacea L.)为对象,在幼龄常规胶园(6龄)、幼龄(6龄)和成龄(20龄)的全周期胶园中进行... 详细信息

【目的】构建和发展橡胶农林复合模式提高综合产出和生态效益,为保障海南省天然橡胶种植业可持续发展提供参考。【方法】以淀粉作物竹芋(Maranta arundinacea L.)为对象,在幼龄常规胶园(6龄)、幼龄(6龄)和成龄(20龄)的全周期胶园中进行间作,从光照、土壤养分、生产力、经济效益和温室气体排放方面,综合分析竹芋在不同类型胶园中的适宜性。【结果】幼龄常规胶园间作的光照条件最差,间作竹芋产量仅4750 kg/hm^(2),而幼龄和成龄全周期胶园中间作区域的光照条件较好,产量分别为27470和11190 kg/hm^(2),不同处理之间存在显著差异(P<0.05)。不同间作处理竹芋的生物量亦呈相同趋势。不同处理竹芋的营养成分(淀粉、粗蛋白和可溶性糖)总体上无显著变化。幼龄和成龄全周期胶园间作竹芋的经济效益分别为86185和9285元/hm^(2),而在幼龄常规胶园中间作则为-21415元/hm^(2)。从净温室气体排放方面看,仅幼龄全周期胶园间作竹芋处理为温室气体的汇(368 kg/hm^(2)),而其他两种处理则为温室气体的源。【结论】幼龄的全周期胶园间作竹芋具有最佳的生产力和经济效益,同时能兼顾一定的生态效益,是海南省适宜的橡胶农林复合模式。

关键词：橡胶农林复合模式竹芋生产力经济和生态效益

Uncovering the dominant contribution of intermediate volatility compounds in secondary organic aerosol formation from biomass-burning emissions

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第3期11卷 150-158页

作者： Kun Li Jun Zhang David M.Bell Tiantian Wang Houssni Lamkaddam Tianqu Cui Lu Qi Mihnea Surdu Dongyu Wang Lin Du Imad El Haddad Jay G.Slowik Andre S.H.Prevot Environment Research Institute Shandong University Laboratory of Atmospheric Chemistry Paul Scherrer Institute

Organic vapors from biomass burning are a major source of secondary organic aerosols(SOAs). Previous smog chamber studies found that the SOA contributors in biomass-burning emissions are mainly volatile organic compounds(VOCs). While intermediate volatility organic compounds(IVOCs) are efficient SOA precursors and contribute a considerable fraction of biomass-burning emissions, their contribution to SOA formation has not been directly observed. Here, by deploying a newly-developed oxidation flow reactor to study SOA formation from wood burning, we find that IVOCs can contribute ～70% of the formed SOA, i.e.>2 times more than VOCs. This previously missing SOA fraction is interpreted to be due to the high wall losses of semi-volatile oxidation products of IVOCs in smog chambers. The finding in this study reveals that SOA production from biomass burning is much higher than previously thought, and highlights the urgent need for more research on the IVOCs from biomass burning and potentially other emission sources.

关键词： atmospheric chemistry biomass burning secondary organic aerosol intermediate volatility organic compounds

Feeding Habits of the Copper Shark, Carcharhinus brachyurus （Gunther, 1870） from Ain ei-Ghazala Lagoon, Eastern Libya during the Period from February till June 2013

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Life Sciences 2015年第8期9卷 347-355页

作者： Raft, Esam Mahmoud Khamis ei-Mor, Mohammad E1-Sayed ei-Sayed Marine biology Branch Zoology Department Faculty of Science Omar A I-Mukhtar University El-Bieda P. O Box 919 Libya Department of Marine Science Faculty of Science Suez Canal University Ismailia 41611 Egypt

The feeding habits of 140 specimens of Carcharhinus brachyurus （Fam. Carcharhinidae） inhabiting Ain-ei-Ghazala lagoon on the Mediterranean Sea, eastern Libya were studied monthly from February to June 2013. The annual diet composition, monthly variations in the diet composition, the variations of diet with length and the intensity of feeding were studied. Carcharhinus brachyurus feed on a wide variety of prey types： Pelagic bony fishes （54.5%）, benthic bony fishes （36.4%）, Cephalopods （6.8%）, Cartilaginous fishes （1.7%） and Fish parts （0.6%）. The Pelagic bony fishes and benthic bony fishes were the major food items during the study period in question, and they were found in all length groups. According to the results that were gleamed from this study, when the size of the sharks increased, the proportion of pelagic bony fishes within the sharks＇ stomachs grew in size, while the benthic bony fishes and Cephalopods decreased in size. The feeding intensity was quite high during the winter, spring and summer, this study is the first to study the Elasmobranchs in Libya, and it will be good base to study another species, specifically.

关键词： Feeding habits Carcharhinus brachyurus Ain-ei-Ghazala lagoon eastern coast Mediterranean Sea Libya.

Impact of cigarette smoking on response to interferon therapy in chronic hepatitis C Egyptian patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2004年第20期10卷 2963-2966页

作者： A.ei-Zayadi Osaima Selim H.Hamdy A.ei-Tawil Hanaa M.Badran M.Attia A.Saeed Departments of Tropical Medicine Ain Shams UniversityCairoEgypt Department of Clinical Pathology Ain Shams UniversityCairoEgypt Department of Pathology Ain Shams UniversityCairoEgypt Department of Hepatology National Liver InstituteMenoufeyaEgypt Department of Hepatology and Gastroenterology Theodor Bilharz Research InstituteCairoEgypt Cairo Liver Center GizaEgypt

AIM:Smoking may affect adversely the response rate to interferon-α.Our objective was to verify this issue among chronic hepatitis C patients. METHODS:Over the year 1998,138 chronic hepatitis C male Egyptian patients presenting to Cairo Liver Center, were divided on the basis of smoking habit into:group I which comprised 38 smoker patients(>30 cigarettes/d) and group Ⅱ which included 84 non-smoker patients. Irregular and mild smokers(16 patients)were excluded. Non eligible patients for interferon-α therapy were excluded from the study and comprised 3/38(normal ALT)in group I and 22/84 in group Ⅱ(normal ALT,advanced cirrhosis and thrombocytopenia).Group I was randomly allocated into 2 sub-groups:group Ia comprised 18 patients who were subjected to therapeutic phlebotomy while sub-group Ib consisted of 17 patients who had no *** sub-group la,3 patients with normal ALT after repeated phlebotomies were excluded from the ***-α 2b 3 MU/TIW was given for 6 mo to 15 patients in group Ia,17 patients in group Ib and 62 patients in group Ⅱ. Biochemical,virological end-of-treatment and sustained responses were evaluated. RESULTS:At the end of interferon-α treatment,ALT was normalized in 3/15 patients(20%)in group Ia and 2/17 patients(11.8%)in group Ib compared to17/62 patients (27.4%)in group Ⅱ(P=0.1).Whereas 2/15 patients(13.3%) in group *** 2/17 patients(11.8%)in group Ib lost viraemia compared to 13/62 patients(26%)in group Ⅱ (P=0.3).Six months later,ALT was persistently normal in 2/15 patients(13.3%)in group 1a and 1/17 patients (5.9%)in group Ib compared to 9/62 patients(14.5%)in group Ⅱ(P=0.47).Viraemia was eliminated in 1/15 patients (6.7%)in group Ia and 1/17 patients(5.9%)in group Ib compared to 7/62 patients(11.3%) in group Ⅱ,but the results did not mount to statistical significance(P=0.4). CONCLUSION:Smokers suffering from chronic hepatitis C tend to have a lower response rate to interferon-α compared to *** phlebotomy imp

关键词： Alanine Transaminase Antiviral Agents Disease Progression Drug Interactions Hepatitis C, Chronic Humans Interferon-alpha Liver Male Phlebotomy Polycythemia Smoking

Effects of Cadmium on Polar Lipid Composition and Unsaturation in Maize(Zea mays) in Hydroponic Culture

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 Integrative Plant Biology 2007年第12期49卷 1693-1702页

作者： Radhouane Chaffai Tinni Nouhou Seybou Brahim Marzouk Ezzedine ei Ferjani Laboratoire de Bio-Physiologie Cellulaires Vegetales Faculte des Sciences de Bizerte 7021 Zarzouna-BizerteTunisie Laboratoire ERTAC Physiologie et Genetique Vegetales 63177 AubiereClermont FerrandFrance Laboratoire d'Adaptation et d'Amelioration des Plantes Institut National de la Recherche Scientifique et Technique(INRST)BP 95-2050 Hammam-LifTunisie

This study aimed to evaluate the effect of Cd exposure （100 μmol/L） on polar lipid composition, and to examine the level of fatty acid unsaturation in maize （Zea mays L.）. In roots, the level of 16：0 and monounsaturated fatty acids （16：1 ＋ 18：1） decreased in phosphatidylcholine （PC） and phosphatidylethanolamine （PE）. In contrast, the proportion of unsaturated 18-C fatty acid species showed an opposite response to Cd. The content, on the other hand, of PC, PE, digalactosyldiacylglycerol （DGDG）, and steryl lipids increased in roots （2.9-, 1.6-, 5.3-, and 1.7-fold increase, respectively）. These results suggest that a more unsaturated fatty acid composition than found in control plants with a concomitant increase in polar lipids may favor seedling growth during Cd exposure. However, the observed increase in the steryl lipid （SL）： phospholipid （PL） ratio （twofold）, the decrease in monogalactosyldiacylglycerol （MGDG）： DGDG ratio, as well as the induction of lipid peroxidation in roots may represent symptoms of membrane injury. In shoots, the unsaturation level was markedly decreased in PC and phosphatidylglycerol （PG） after Cd exposure, but showed a significant increase in sulfoquinovosyldiacylglycerol （SQDG）, MGDG and DGDG. The content of PG and MGDG was decreased by about 65%, while PC accumulated to higher levels （4.4-fold increase）. Taken together, these changes in the polar lipid unsaturation and composition are likely to be due to alterations in the glycerolipid pathway. These results also support the idea that the increase in overall unsaturation plays some role in enabling the plant to withstand the metal exposure.

关键词： cadmium fatty acids heavy metal stress lipid peroxidation polar lipids unsaturation level Zea mays.

A mathematical model for preventing HIV virus from proliferating inside CD4 T brownian cell using Gaussian jump nanorobot

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2019年第7期12卷 71-94页

作者： Mohamed Abd Allah ei-Hadidy Alaa A.Alzulaibani Mathematics and Statistics Department College of Science Taibah UniversityYanbuKingdom of Saudi Arabia Mathematics Department Faculty of Science Tanta UniversityTantaEgypt

We present a statistical distribution of a nanorobot motion inside the *** distribution is like the distribution of A and B particles in continuous time random walk scheme inside the fAuid reactive anomalous transport with stochastic waiting time depending on the Gaussian distribution and a Gaussian jump length which is detailed in Zhang and Li[***,Published Online with doi:10.1007/s10955-018-2185-8,2018].Rather than estimating the length parameter of the jumping distance of the nanorobot,we normalize the Probability Density Function(PDF)and present some reliability properties for this *** addition,we discuss the truncated version of this distribution and its statistical properties,and estimate its length *** use the estimated distance to study the conditions that give a finite expected value of the first meeting time between this nanorobot in the case of nonlinear flow with independent d-dimensional Gaussian jumps and an independent d-dimensional CD4 T Brownian cell in the blood(d-space)to prevent the HIV virus from proliferating within this cell.

关键词： Stochastic waiting time CD4 T Brownian cell nanorobot distribution uni-formly integrable functions

FeO-rich silicates and Ca, Al-rich inclusions in Qingzhen andYamato 691 (EH3) meteorites: Evidence for migration of mass in the solar nebula

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2002年第2期47卷 150-153页

作者： LIN Yangting OUYANG Ziyuan A.ei Goresy Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China Institute of Geochemistry Chinese Academy of SciencesGuiyang 550002China Max-Planck-Institut fur Chemie

The Qingzhen and Yamato 691 (EH3) enstatite chondrites, which formed under extremely reducing condi-tions, are studied using the scanning electron microscope and electron probe microanalyzer. Both meteorites contain FeO-rich silicates and minor Ca, Al-rich inclusions. Most FeO-rich silicates are Ca-poor pyroxenes and occur as frag-ments in matrix. A few grains of FeO-rich silicates were found in chondrules, and FeO-rich olivine is rare. In Qingzhen, FeO-rich silicates commonly contain abundant dust-like Ni-poor metals, which probably formed through reduction of FeO. In contrast, only a few fragments of FeO-rich silicates in Yamato 691 enclose dust-like metals. This difference is consistent with a more reducing condition of Qingzhen than Yamato 691. Ca, Al-rich inclusions have similar modal compositions and mineral chemistry as their counterparts in carbonaceous chondrites. We suggest that (1) the FeO-rich silicates probably formed in oxidized regions of the solar nebula, and then moved into the

关键词： solar nebula meteorite enstatite chondrite reduction migration.

多学科多阶段预防ICU患者呼吸机相关性肺炎的质量改进策略

在线全文

学校读者我要写书评

暂无评论

中华急危重症护理杂志 2024年第7期5卷 649-655页

作者：秦薇王文超姚文杰古月郎琴许晓岚巴音郭楞蒙古自治州人民医院重症医学一科新疆维吾尔自治区841000 巴音郭楞蒙古自治州人民医院神经外科监护室新疆维吾尔自治区841000 巴音郭楞蒙古自治州人民医院护理部新疆维吾尔自治区841000 复旦大学附属儿童医院重症医学科

目的探索多学科多阶段预防呼吸机相关性肺炎(ventilation associated pneumonia,VAP)质量改进策略(以下简称质量改进策略)对ICU患者VAP发生水平的影响。方法以新疆巴州某三级甲等综合医院ICU为研究场所,以2020年1月—2023年12月行有创... 详细信息

目的探索多学科多阶段预防呼吸机相关性肺炎(ventilation associated pneumonia,VAP)质量改进策略(以下简称质量改进策略)对ICU患者VAP发生水平的影响。方法以新疆巴州某三级甲等综合医院ICU为研究场所,以2020年1月—2023年12月行有创机械通气的患者作为研究对象,每年作为一个研究时段。融合循证护理和实施科学的方法学,构建质量改进策略,根据每个研究时段有针对性地实施干预策略。结果2021年—2023年,VAP发生水平均低于院级预警线,2023年VAP综合干预策略执行率均较基线有显著提高,差异具有统计学意义(P<0.05);所有入组患者均未出现非计划性拔管;2023年平均机械通气日较2020年显著降低,差异具有统计学意义(W=6786,P=0.008)。结论质量改进策略可有效降低ICU患者VAP发生水平,有效提升临床医疗和护理质量。

关键词：重症监护呼吸机相关性肺炎质量改进循证护理实施科学