检索结果-南通市图书馆

Morphological and genetic differentiation in isolated populations of Mexican beech Fagus grandifolia ***

Journal of Forestry Research 2021年第5期32卷 2169-2179页

作者： Dulce María Galván-Hernández Pablo Octavio-aguilar Luis Lazcano-Cruz Arturo Sánchez-González Population Ecology Laboratory of the Biological Research Center Autonomous University of HidalgoKm 4.5 Pachuca-Tulancingo HighwayCP 42184 Mineral de La ReformaHidalgoMexico Genetic Laboratory of the Biological Research Center Autonomous University of HidalgoKm 4.5 Pachuca-Tulancingo HighwayCP 42184 Mineral de La ReformaHidalgoMexico

Mexican beech[Fagus grandifolia ***(Martinez)***]is a subspecies endemic to the Sierra Madre Oriental Mountains and considered endangered due to the low density of its populations and high degree of habitat fragmentation and environmental *** its morphological and genetic variation is associated with its ability to adapt to changes in environmental conditions,the objective of this study was to determine whether phenotypic and genotypic variation exist,and it relationships with population reduction *** four beech populations in the states of Hidalgo and Veracruz,we analyzed 11 morphological variables for leaves and 6 micros atellite *** morphological variables that to discriminate between populations were related to the size of the leaf,but a robust differentiation pattern was not found,given that independent groups of leaves were *** populations located closest to each other,had greater genetic variation and less genetic distance;populations in the extreme north and south had the lowest genetic *** differentiation among populations was associated with reduction in population *** the 3 localities in Hidalgo,recent bottlenecks were identified,and in Veracruz,an old bottleneck was *** in leaf morphology and genetic structure of Mexican beech populations could be the result of a combination of various geographical,climate and ecological factors.

关键词： Adaptation Bottleneck Genetic structure Leaf morphology Mexico Sierra madre oriental

来源：

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

In Vitro-Propagation of Agave tequilana Weber *** in a Temporary Immersion System

引用

Phyton-International Journal of Experimental Botany 2022年第1期91卷 83-96页

作者： Otilio Vázquez-Martínez Héctor Gordon Núñez-Palenius Eugenio M.Pérez-Molphe Balch Mauricio Valencia-Posadas Luis Pérez-Moreno Graciela M.L.Ruiz-aguilar M.Gómez-Lim División de Ciencias de la Vida Universidad de GuanajuatoIrapuato36500México Departamento de Química Centro de Ciencias BásicasUniversidad Autónoma de AguascalientesAguascalientes20131México Departamento de Ingeniería Genética CINVESTAV Unidad IrapuatoIrapuato36500México

In Mexico,there is a need to produce large quantities of plantlets for the establishment and replanting of blue(***)agave production *** of these plots are within the origin denomination area(DOT,Spanish acronym)of the distilled product of this plant,known as *** objective of this study was to develop an in vitropropagation protocol for Agave tequilana Weber *** using segmented stems in both:solid and liquid media.A disinfection and in vitro technique were developed to obtain shoots,through plantlets collected in commercial plots,which attained 100%surface-disinfection and budding *** the multiplication stage,the effects of 6-Benzylaminopurine(BA)(0.0,4.4 and 13.2μM)and kinetin(0.0,9.4,18.8 and 37.6μM)were evaluated on lateralshoot production of segmented sagittal *** were cultivated on Murashige&Skoog(MS)medium,with the addition of 3.0%sucrose and 8 g L−1 *** was observed that BA and kinetin increased the number of shoots per explant,obtaining up to 18 and 26,***,it was found that just the sagittal segmentation of explants increased axillary *** the other hand,segmented-stem bases were grown in MS liquid medium with 3.0%sucrose,inside a RITAsystem,programmed by a 5 min immersion step with a frequency of every 4 *** effect of Indole−3-Acetic acid(IAA)(0.57,2.9,5.7μM)was evaluated,while maintaining a concentration of BA(13.2μM).It was observed that the greatest concentration of IAA led to the formation of more than 20 buds per *** results offer a new methodology to increase the efficiency of *** Weber ***-in vitro multiplication by sagittal segmentation of stems and the addition of BA and/or IAA.

关键词： Plant tissue culture stem-disk culture tequila in vitro culture

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Use of pCONUS HPC for the treatment of unruptured wide- necked bifurcation aneurysms: early clinical experience using single antiplatelet therapy

引用

Stroke & Vascular Neurology 2021年第1期6卷 57-64页

作者： Marta aguilar Perez Victoria Hellstern Carmen Serna Candel Christina Wendl Hansjorg Bazner Oliver Gansladt Hans Henkes Neuroradiologische Klinik NeurozentrumKlinikum StuttgartStuttgartGermany Institut fur Rontgendiagnostik Zentrum fur NeuroradiologieFakultat für Medizin der Universitat RegensburgRegensburgGermany Neurologische Klinik NeurozentrumKlinikum StuttgartStuttgartGermany Neurochirurgische NeurozentrumKlinikum StuttgartStuttgartGermany Medizinische Fakultat Universitat Duisburg-EssenEssenGermany

Background In recent years,a growing number of stents and stent-like devices have become available to facilitate the treatment of challenging ***,the need for dual antiplatelet therapy can limit their use,especially in ruptured *** hydrophilic polymer coating(pHPC,phenox)is a novel glycan-based multilayer polymer that reduces platelet *** study aims to report our initial experience using the pCONUS HPC device for the treatment of unruptured wide-necked bifurcation aneurysms(WNBA)using acetylsalicylic acid(ASA)as single antiplatelet therapy(SAPT).Methods We retrospectively identified all patients who were treated with the pCONUS HPC for unruptured WNBA in a multi-staged procedure using ASA as *** were made of periprocedural complications,clinical outcome and angiographic and clinical *** We identified 15 patients with 15 *** average age was 69 years old(range,41-76).Seven aneurysms were located in the middle cerebral artery,five in the anterior communicating artery,two at the basilar tip and one in the posterior communicating *** post-treatment angiography showed five aneurysms with modified Raymond-Roy classification(mRRC)grade Ⅰ and four aneurysms with mRRC grade Ⅱ.There were no haemorrhagic *** patients developed thrombus formation during the second treatment session,all of them completely resolving after administration of glycoprotein Ⅱb/Ⅲa *** follow-up data were available for 10 patients and showed adequate occlusion(mRRC Ⅰ or Ⅱ)in eight aneurysms(80%).In-stent stenosis was observed in one patient whereas two patients showed de novo stenosis in one of the efferent *** This early experience on the use of the pCONUS HPC device suggests that it can be useful for treating unruptured WNBA under ASA as *** investigation with a randomised treatment registry and larger cohort is needed.

关键词： treatment bifurcation HPC

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Red pigment production by Penicillium purpurogenum GH2 is influenced by pH and temperature

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第12期12卷 961-968页

作者： Alejandro MéNDEZ Catalina PéREZ Julio Cesar MONTAéZ Gabriela MARTíNEZ Cristóbal Noé aguilar Department of Food Science and Technology School of Chemistry Universidad Autónoma de Coahuila Saltillo 25280 Coahuila Mexico Department of Organic Chemistry School of Chemistry Universidad Autónoma de Coahuila Saltillo 25280 Coahuila Mexico Department of Chemical Engineering School of Chemistry Universidad Autónoma de Coahuila Saltillo 25280 Coahuila Mexico

The combined effects of pH and temperature on red pigment production and fungal morphology were evaluated in a submerged culture of Penicillium purpurogenum GH2, using Czapek-Dox media with D-xylose as a carbon source. An experimental design with a factorial fix was used: three pH values (5, 7, and 9) and two temperature levels (24 and 34 °C) were evaluated. The highest production of red pigment (2.46 g/L) was reached with a pH value of 5 and a temperature of 24 °C. Biomass and red pigment production were not directly associated. This study demon- strates that P. purpurogenum GH2 produces a pigment of potential interest to the food industry. It also shows the feasibility of producing and obtaining natural water-soluble pigments for potential use in food industries. A strong combined effect (p<0.05) of pH and temperature was associated with maximal red pigment production (2.46 g/L).

关键词： Penicillium purpurogenum Food colorants Combined effects Water-soluble pigment

来源：

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

Secondary sclerosing cholangitis after critical COVID-19:Three case reports

引用

World Journal of Hepatology 2022年第8期14卷 1678-1686页

作者： Juan M Mayorquín-aguilar Aldo Lara-Reyes Luis Alberto Revuelta-Rodríguez Nayelli C Flores-García Astrid Ruiz-Margáin Marco Antonio Jiménez-Ferreira Ricardo Ulises Macías-Rodríguez Department of Gastroenterology Instituto Nacional de Ciencias Médicas y Nutrición Salvador ZubiránMexico City 14080Mexico Department of Pathology Instituto Nacional de Ciencias Médicas y Nutrición Salvador ZubiránMexico City 14080Mexico

BACKGROUND The global coronavirus disease 2019(COVID-19)pandemic has caused more than 5 million *** involvement is well described,including liver *** patients with critical COVID-19,a new entity called"post-COVID-19 cholangiopathy"has been *** SUMMARY Here,we present three patients with severe COVID-19 that subsequently developed persistent cholestasis and chronic liver *** three patients required intensive care unit admission,mechanical ventilation,vasopressor support,and broad spectrum antibiotics due to secondary *** transplant protocol was started for two of the three *** Severe COVID-19 infection should be considered a potential risk factor for chronic liver disease and liver transplantation.

关键词： SARS-CoV-2 Persistent cholestasis Liver chemistry Hypoxic cholangiopathy Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PED Flex with Shield Technology:a feasible alternative for fusiform MCA aneurysms

引用

Stroke & Vascular Neurology 2018年第3期3卷 185-188页

作者： Guilherme J.Agnoletto Pedro aguilar-Salinas Roberta Santos Eric Sauvageau Ricardo A.Hanel Lyerly Neurosurgery Baptist Neurological InstituteJacksonvilleFLUSA

BACKGROUND The advent of flow diverters(FDs)has changed the scope of endovascular treatment options for intracranial aneurysms(IAs).FDs can effectively treat complex aneurysms in which both microsurgical and conventional endovascular options are less than ideal.12 The Pipeline Flex Embolization Device(PED;Medtronic,Irvine,California,USA)has been available in the USA for several years demon-strating positive *** recently,the PED Flex with enhanced delivery features has been introduced,and although decreased,thromboembolic complications are still a potential risk.3 In light of this,a new surface modification was applied to the PED Flex known as Shield Technology consisting of a phosphorylcholine layer covalently bound to its metal braids potentially reducing its thrombogenicity.4 Herein,we report our initial experience using the PED Flex with Shield Technology in the treatment of an unruptured fusiform aneurysm located in the middle cerebral artery(MCA)using dual-an-tiplatelet therapy.

关键词： Flex PED MCA treatment

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

掺硼金刚石阳极电氧化和电芬顿工艺处理真实水体中低含量药物的研究(英文)

引用

电化学 2013年第4期19卷 300-312页

作者： Ignasi Sirés JoséAntonio Garrido enric Brillas Laboratori d'Electroquímica dels Materials i del Medi Ambient Departament de Química FísicaFacultat de QuímicaUniversitat de BarcelonaMartíi Franquès 1-1108028 BarcelonaSpain

本文报告了采用掺硼金刚石阳极(BDD)电氧化和电芬顿工艺处理真实水体中注入含有少量药物残留物的单组分和多组分溶液(即1 mg.L-1对乙酰氨基酚和(或)1 mg.L-1水杨酸,pH=3)的研究结果.以恒定电流密度方式在BDD/Pt电解池中进行电氧化,而在B... 详细信息

本文报告了采用掺硼金刚石阳极(BDD)电氧化和电芬顿工艺处理真实水体中注入含有少量药物残留物的单组分和多组分溶液(即1 mg.L-1对乙酰氨基酚和(或)1 mg.L-1水杨酸,pH=3)的研究结果.以恒定电流密度方式在BDD/Pt电解池中进行电氧化,而在BDD/空气扩散电解池中进行电芬顿,从而在阴极电生H2O2.结果表明,由于乙酰氨基酚和水杨酸均与溶液中氯离子氧化所产生的活性氯物种发生反应,因此,电氧化处理真实水体中两种药物的降解要比超纯水中添加0.05 mol.L-1Na2SO4快.这种含氯氧化剂的反应活性甚至超过了阳极形成的有限的羟基活性基,提高电流密度大大加速了两种污染物的消除.在真实水体自然碱性pH下得到了类似的结果.当电氧化处理两种药物的混合物时,两种药物上面产生的氧化剂的竞争作用,导致药物的降解变慢,只有电芬顿处理真实水体时药物的降解才稍微加快,这是由于H2O2与Cl-的反应,生成了反应活性弱得多的含氯活性基,从而抑制了电生的H2O2和添加的Fe2+之间发生的芬顿反应所形成的同相羟基活性基的累积.对于添加了药物的真实水体,在较高的电流密度下电氧化可得到较好的天然有机物成分(NOM)矿化度,且添加0.05 mol.L-1Na2SO4效果会更好.虽然在药物溶液的电氧化中检测出微量的氧化副产物,如对苯醌、NO3-和NH4+离子,但在本研究条件下无法去除真实水体中所含有的氮基化合物.

关键词：掺硼金刚石阳极电氧化电芬顿药物真实水体水杨酸

来源：

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

High-resolution characterization of hexagonal boron nitride coatings exposed to aqueous and air oxidative environments

引用

Nano Research 2017年第6期10卷 2046-2055页

作者： Lanlan Jiang Na Xiao Bingru Wang enric Grustan-Gutierrez Xu Jing Petr Babor Miroslav Kogbal Guangyuan Lu Tianru Wu Haomin Wang Fei Hui Yuanyuan Shi Bo Song Xiaoming Xie Mario Lanza Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou 215123 China CEITEC BUT Brno University of Technology Brno 61669 Czech Republic State Key Laboratory of Functional Materials for In formatics Shanghai Institute of Microsystems and Information Technology Chinese Academy of Sciences Shanghai 200050 China School of Physical Science and Technology Shanghai Tech University Shanghai 201210 China

Hexagonal boron nitride （h-BN） is believed to offer better passivation to metallic surfaces than graphene owing to its insulating nature, which facilitates blocking the flow of electrons, thereby preventing the occurrence of galvanic reactions. Nevertheless, this may not be the case when an h-BN-protected material is exposed to aqueous environments. In this work, we analyzed the stability of mono and multilayer h-BN stacks exposed to H202 and atmospheric conditions. Our experiments revealed that monolayer h-BN is as inefficient as graphene as a protective coating when exposed to H202. Multilayer h-BN offered a good degree of protection. Monolayer h-BN was found to be ineffective in an air atmosphere as well. Even a 10-15 layers-thick h-BN stack could not completely protect the surface of the metal under consideration. By combining Auger electron spectroscopy and secondary ion mass spectrometry techniques, we observed that oxygen could diffuse through the grain boundaries of the h-BN stack to reach the metallic substrate. Fortunately, because of the diffusive nature of the process, the oxidized area did not increase with time once a saturated state was reached. This makes multflayer （not monolayer） h-BN a suitable long-term oxidation barrier. Oxygen infiltration could not be observed by X-ray photoelectron spectroscopy. This technique cannot assess the chemical composition of the deeper layers of a material. Hence, the previous reports, which relied on XPS to analyze the passivating properties of h-BN and graphene, may have ignored some important subsurface phenomena. The results obtained in this study provide new insights into the passivating properties of mono and multilayer h-BN in aqueous media and the degradation kinetics of h-BN-coated metals exposed to an air environment.

关键词： hexagonal boron nitride protective coating local oxidation nanoscale two-dimensional (2D)materials

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Knowledge, Attitudes, Practices, and Perceptions for Salt/Sodium Reduction in the Gastronomic Sector of Costa Rica

引用

Food and Nutrition Sciences 2023年第11期14卷 1094-1118页

作者： Hilda P. Núñez-Rivas Marlene Roselló-Araya Adriana Blanco-Metzler Benavides-aguilar Karla Karol Madriz-Morales Unit of Health and Nutrition of the Costa Rican Institute of Research and Education on Nutrition and Health (INCIENSA) Cartago Costa Rica Independent Researcher Cartago Costa Rica Directorate of Research and Health Technologies Ministry of Health San José Costa Rica

Excess sodium intake is associated with high blood pressure and cardiovascular diseases. This study examined food services in Costa Rica as a major source of sodium. The research included six cafeterias, six fast food establishments, 13 restaurants, and 15 diners using non-probabilistic convenience sampling. Interviews were conducted with workers to assess knowledge, attitudes, and practices regarding salt reduction. The findings were analyzed to determine effective intervention strategies. Participants showed regular knowledge about salt/sodium. While they recognized the link with high blood pressure, understanding of other health problems was limited. Positive attitudes were observed toward healthy cooking and reducing sodium in pre-prepared food, especially in restaurants. Over 70% expressed a desire to reduce salt in food services, with more than 80% indicating a need for staff training, particularly in cafeterias lacking knowledge of low-salt preparations. High-sodium ingredients were prevalent, with saltshakers and sauces readily available. However, some individuals were reluctant to reduce salt/sodium intake, citing concerns about taste, food variety, and customer complaints. Obstacles to reducing salt/sodium levels included limited accessibility and the cost of low-sodium ingredients. The data collection tools and methodologies used in this study can serve as a foundation for future investigations and strategies to reduce salt consumption in food services. The study recommends government support for transforming the gastronomic sector and implementing regulations and knowledge enhancement. Collaboration with the productive sector is crucial for creating healthy environments. This research presents valuable evidence regarding the utilization of salt and sodium in the gastronomic sector, thereby assisting in the decision-making process for public health initiatives and the prevention of non-communicable chronic diseases. It highlights the significance of tackl

关键词： Salt Sodium Gastronomic Sector Food Environment Knowledge Attitudes Practices Perceptions Non-Communicable Chronic Diseases

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PGE2 as a Morphine-Seeking Behavior Modulator in the Place Preference Model

引用

Journal of Behavioral and Brain Science 2022年第12期12卷 627-639页

作者： Ariadna Jiménez-González Abraham Ochoa-aguilar Katia Mendoza-Negrete Leticia Parra-Gamez Claudia Gómez-Acevedo Department of Pharmacology Behavioral Pharmacology Laboratory Facultad de Medicina Universidad Nacional Autónoma de México (UNAM) México City México Hospital Loma Linda Translational Research Laboratory Naucalpan México Department of Anatomy Facultad de Medicina Universidad Nacional Autónoma de México (UNAM) México City México

The opioid epidemic has become one of the most concerning public health issues in the world, and currently does not have an adequate treatment available. It has been observed that, despite opioids being highly addictive, patients with chronic inflammation are less likely to develop an opioid dependence. This protective effect may be caused by Prostaglandin E2 (PGE2) as it has been found that non-painful carrageenan inflammation reduces morphine induced reward. Taking this into account, the aim of this study was to determine if the direct administration of PGE2 into the central nervous system could modulate the morphine-induced reward. We used the morphine-conditioned place preference (CPP) model with and without PGE2 or PGE2R antagonist in order to test the reward response. We found a significant reduction of morphine-induced reward after administering PGE2. Moreover, we found that this effect could be reversed by PGE2 receptor antagonism. Our data suggest that PGE2 may reduce morphine-induced reward making it an important drug-target research alternative to explore the possibility of modifying or even preventing opioid addiction.

关键词： Morphine Addiction Conditioned Place Preference Rats Prostaglandins Immune System Reward

来源：

维普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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：