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Response of ants to grazing disturbance at the central monte Desert of Argentina: community descriptors and functional group scheme

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Journal of Arid Land 2014年第1期6卷 117-127页

作者： Silvia CLAVER susana L SILNIK Florencia F CAmPóN Entomology Lab IADIZA-CONICET

Livestock ranching is one of the main productive activities in arid regions of the *** produces changes in animal as well as plant communities(***,abundance and species dominance relationships).Ants are good biological indicators due to the environmental fidelity of some of their community *** described the functional structure of the ant community in the central monte of mendoza,Argentina,and examined the effect of grazing using richness,diversity and the functional group *** used pitfall traps to sample ants at a reserve with 30-year cattle exclusion and at an adjacent *** of the 27 recorded species showed significant differences in their abundance and two species were absent at the *** richness and diversity did not reflect these differences,functional groups *** Climate Specialists were more abundant at the ranch while Cryptic Species and Generalized myrmicinae increased at the *** study supports the utility of the functional group scheme to study the effects of grazing disturbance in ant communities of arid regions.

关键词： ants cattle grazing functional groups richness diversity arid zones monte Desert

How mind-body therapies might reduce pathological features of Alzheimer’s disease

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Neural Regeneration Research 2022年第8期17卷 1757-1758页

作者： melanie Hüttenrauch susana Castro-Obregón División de Neurociencias Instituto de Fisiología CelularUniversidad Nacional Autónoma de México(UNAM)Circuito Exterior SNCiudad UniversitariaCDMXMexico

Alzheimer’s disease(AD)is an irreversible neurodegenerat i ve disorder that i s responsible for around 60-80%of all dementia cases and currently affects around 50 million people *** the population’s life span tends to increase,current predictions suggest that by 2050,152 million people worldwide will suffer from dementia(Balsinha,2019).While the exact cause of AD remains obscure,various hypotheses regarding AD etiology have been described in the last *** to the amyloid hypothesis,the pathogenic changes related to AD start with the accumulation of amyloid-beta(Aβ)in the *** Aβpeptides form oligomers and insoluble amyloid plaques which are neurotoxic and trigger harmful downstream events such as the aggregation of the microtubule-associated protein Tau into neurofibrillary tangles,chronic inflammation,and brain atrophy.

关键词： Alzheimer inflammation irreversible

Estimation of Displacement and Extension due to Reverse Drag of Normal Faults:Forward method

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Oxidative effects of the harmful algal blooms on primary organisms of the food web

International Journal of Geosciences（地球科学国际期刊） 2024年第1期

作者： Shunshan Xu Angel Francisco Nieto-Samaniego Huilong Xu susana Alicia Alaniz-Álvarez

来源：博看期刊评论

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BIOCELL 2019年第2期43卷 41-50页

作者： JOAQUIN CABREra PAULA mARIELA GONZALEZ susana PUNTARULO Universidad de Buenos Aires Facultad de Farmacia y BioquimicaFisicoquimica.Buenos AiresArgentina CONIONI CETET-Universidad de Buenos Aires.Instituto de Bioquimica y medicina molecular(IBI IBI mOLOL).Buenos Aires Argentina

Degraded water quality from nutrient pollution,physical,biological,and other chemical factors contributes to the development and persistence of many harmful algal blooms(HAB s).The complex dynamics of the HAB s is a challenge to marine ecosystems for the toxic effects *** consequences include fish,bird,and mammal mortality,respiratory or digestive tract problems,memory loss,seizures,lesions and skin irritation in many *** review is intended to briefly summarize the recent reported information on harmful marine toxin deleterious effects over the primary organisms of the food web,namely algae,zooplankton and *** focus is made on oxidative stress status of cells and *** though in situ field research is less controlled than laboratory studies,in which the organisms are directly exposed to the toxins under consideration,both types of approaches are required to fully understand such a complex *** top of that,the contribution of the increasing water temperatures in the sea,as a consequence of the global climate change,will be addressed as a topic for further studies,to evaluate the effect on regulating algal growth,species composition,trophic structure,metabolic stress and function of aquatic ecosystems.

关键词： Harmful algal toxins oxidative stress algae zooplankton invertebrates

The complexity of nitric oxide generation and function in plants

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BIOCELL 2016年第1期40卷 1-5页

作者：无 mARIA P BENAVIDES susana m GALLEGO FACUNDO ramOS ARTUSO mARIANA CHECOVICH ANDREA GALATRO Instituto de Bioquímica y medicina molecular(IBImOL) Universidad de Buenos Aires-CONICETBuenos AiresArgentina Cátedra Química Biológica Vegetal Instituto de Química y Fisicoquímica Biológicas"Prof.Alejandro C.Paladini"(IQUIFIB)UBA-CONICETBuenos AiresArgentina Instituto de Fisiología Vegetal(INFIVE)CONICET-UNLP La PlataArgentina Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico Chascomús(IIB-INTECH) CONICET-UNSAMChascomúsArgentina

Plants are exposed to environmental stress,in natural and agricultural *** oxide(NO),a small gaseous molecule which plays important roles in plants,has been involved in many physiological processes,and emerged as an important endogenous signaling molecule in the adaptation of plants to biotic and abiotic *** is produced from a variety of enzymatic and non enzymatic sources,which are not yet fully ***,NO and reactive nitrogen species(RNS)can produce posttranslational modifications affecting protein *** reductase,a key enzyme in the nitrogen metabolism,is a proposed source of NO in plants which could be affected by posttranslational ***,different pathways seem to be involved and can also regulate NO synthesis in the plant cell under physiological or stress ***,how the levels of NO are reached in such time and place to fulfill its functions,are still puzzles to elucidate.

关键词： nitrate reductase polyamines posttranslational modifications

Oxidative effects of glyphosate on the lipophobic intracellular environment in the microalgae Chlorella vulgaris

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BIOCELL 2022年第3期46卷 795-802页

作者： JUAN mANUEL OSTEra susana PUNTARULO GABRIELA mALANGA Fisicoquímica Facultad de Farmacia y BioquímicaUniversidad de Buenos AiresBuenos AiresCP 1113Argentina Instituto de Bioquímica y medicina molecular(IBImOL) CONICET-Universidad de Buenos AiresBuenos AiresCP 1113Argentina

The studied hypothesis is that the herbicide glyphosate(GLY)can affect the oxidative balance in the hydrophobic intracellular medium in non-target Chlorella vulgaris *** GLY and RoundUp(RUP)supplementation,affected the growth profile.A significant 42%decrease in the cellular biomass in stationary(St)phase was observed in cultures supplemented with either 5μm of GLY or RUP,as compared to control *** treatment with 0.3μm of GLY generated non-significant effects on the oxidation rate of 2’,7’dichlorofluorescein diacetate(DCFH-DA),neither in exponential(Exp)nor in St phase of development,as compared to control ***,the treatment with either 5μm GLY or 0.3 and 5μm RUP lead to a significant decrease in the DCFH-DA oxidation rate,as compared to control *** lipid radical(LR●)generation rate,detected by Paramagnetic Resonance Spectroscopy(EPR),was significantly increased in the presence of RUP,in Lag and Exp phase of *** non-enzymatic antioxidants,α-Tocopherol(α-T)andβ-Carotene(β-C),are aimed to protect membranes against the damage produced by the radical *** content ofβ-C was not significantly affected,as compared to control cultures,by any of the treatments,in both growth phases of cellular *** content ofα-T was significantly decreased by the supplementation with either 0.3 or 5μm of RUP or 5μm *** LR●/α-T ratio,used as indicator of the oxidative balance in the hydrophobic cellular media,was significantly different between samples obtained from control and RUP-exposed microalgae in both,Exp and St phase of development,with either 0.3 or 5μm *** data presented here showed evidence that suggested that oxidative balance in the hydrophobic environment was affected by either GLY or RUP.

关键词： 2’,7’dichlorofluorescein diacetate oxidation rate Lipid soluble antioxidants Round up Redox balance

Engineering operando methodology： Understanding catalysis in time and space

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 509-536页

作者： raquel Portela susana Perez-Ferreras Ana Serrano-Lotina miguel A. Banares Instituto de Catalisis y Petroleoquimica ICP-CSIC Marie Curie 2 Madrid Spain

The term operando was coined at the begin- ning of this century to gather the growing efforts devoted to establish structure-activity relationships by simulta- neously characterizing a catalyst performance and the relevant surface chemistry during genuine catalytic opera- tion. This approach is now widespread and consolidated; it has become an increasingly complex but efficient junction where spectroscopy, materials science, catalysis and engineering meet. While for some characterization techni- ques kinetically relevant reactor cells with good resolution are recently developing, the knowledge gained with magnetic resonance and X-ray and vibrational spectro- scopy studies is already huge and the scope of operando methodology with these techniques is recently expanding from studies with small amounts of powdered solids to more industrially relevant catalytic systems. Engineering catalysis implies larger physical domains, and thus all sort of gradients. Space- and time- resolved multi-technique characterization of both the solid and fluid phases involved in heterogeneous catalytic reactions （including temperature data） is key to map processes from different perspectives, which allows taking into account existing heterogeneities at different scales and facing up- and down-scaling for applications ranging from microstructured reactors to industrial-like macroreactors （operating with shaped catalytic bodies and/or in integral regime）. This work reviews how operando methodology is evolving toward engineered reaction systems.

关键词： operando structured catalysts spaceresolved time-resolved spectroscopy

Ursane derivatives isolated from leaves of Hylocereus undatus inhibit glycation at multiple stages

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Chinese Journal of Natural medicines 2018年第11期16卷 856-865页

作者： ROSA mARTHA Pérez-Gutiérrez susana GABRIELA Enriquez-Alvirde Research Laboratory of Natural Products School of Chemical Engineering and Extractive Industries National Polytechnic Institute

The present study was designed to evaluate the therapeutic potential of bioactive compounds from chloroform extract of the leaves of Hylocereus undatus in the formation of advanced glycation end products(AGEs) in vitro. Bioactivity-guided fractionation of chloroform extract from Hylocereus undatus afforded two novel 12-ursen-type triterpenes, 3β, 16α, 23-trihydroxy-urs-12-en-28-oic acid(1) and 3β, 6β, 19α, 22α-tetrahydroxy-urs-12-en-28-oic acid(2), as well as four known triterpenes 2α, 3β, 23-tetrahydroxy-urs-11-en-28-oic acid(3), 3β-acetoxy-28-hydroxyolean-12-ene(4), 3β, 16α-dihidroxyolean-12-ene(5) and 3β-acetoxy-olean-12-ene(6). Our results revealed that triterpenes 1–3 were able to inhibit the formation of AGEs in all tested assays. The data indicated that the triterpenes had inhibitory activity at the múltiple stages of glycation and that there might be a high potential for decreasing protein oxidation and protein glycation that can enhance glycative stress in diabetic complications.

关键词： Hylocereus undatus Advanced glycation end product Triterpenes

Total organic halogen(TOX) in human urine: A halogen-specific method for human exposure studies

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Journal of Environmental Sciences 2017年第8期29卷 285-295页

作者： susana Y.Kimura Weiwei Zheng Taylor N.Hipp Joshua m.Allen Susan D.Richardson Department of Chemistry and Biochemistry University of South Carolina Key Laboratory of Public Health Safety Ministry of Education Department of Environmental Health School of Public Health Fudan University

Disinfection by-products（DBPs） are a complex mixture of compounds unintentionally formed as a result of disinfection processes used to treat drinking water. Effects of long-term exposure to DBPs are mostly unknown and were the subject of recent epidemiological studies. However,most bioanalytical methods focus on a select few DBPs. In this study, a new comprehensive bioanalytical method has been developed that can quantify mixtures of organic halogenated compounds, including DBPs, in human urine as total organic chlorine（TOCl）, total organic bromine（TOBr）, and total organic iodine（TOI）. The optimized method consists of urine dilution, adsorption to activated carbon, pyrolysis of activated carbon, absorption of gases in an aqueous solution, and halide analysis with ion chromatography and inductively coupled plasma-mass spectrometry. Spike recoveries for TOCl, TOBr, and TOI measurements ranged between 78% and 99%. Average TOCl, TOBr, and TOI concentrations in five urine samples from volunteers who consumed tap water were 1850, 82, and 21.0 μg/L as X^-, *** who consumed spring water（control） had TOCl, TOBr, and TOI average concentrations in urine of 1090, 88, and 10.3 μg/L as X^-, respectively. TOCl and TOI in the urine samples from tap water consumers were higher than the control. However, TOBr was slightly lower in tap water urine samples compared to mineral water urine samples, indicating other sources of environmental exposure other than drinking water. A larger sample population that consumes tap water from different cities and mineral water is needed to determine TOCl, TOBr, and TOI exposure from drinking water.

关键词： Adsorbable organic halogen(AOX) Total organic halogen(TOX) Disinfection by-products(DBPs) Total organic chlorine(TOCl) Total organic bromine(TOBr) Total organic iodine(TOI) Urine Drinking water