Universidad Nacional de La Pampa
  • Santa Rosa, La Pampa, Argentina
Recent publications
There is a need for more sustainable management of phosphorus (P) fertilization including reutilization of wastes and taking more advantage of the biological cycling of P in the crop-livestock-soil system to comply with the Sustainable Development Goals. The objective of the present study was to evaluate the effect of soil type and management on microbial carbon (C) and P transformations (mineralization-immobilization processes) and their seasonal fluctuations throughout the year to assess the feasibility of enhancing biological P cycling by changing crop rotations. A sandy loam petrocalcic Paleustoll with a calcium carbonate hardpan at approximately 0.8 m depth, and a sandy typic Ustipsamment were selected in the Argentinean semiarid Pampa. Soil management treatments were a 50-year-old Weeping Lovegrass pasture (PP) and three agricultural plots belonging to long-term trials with and without cover crops under no-till: maize monoculture (M−M), maize-rye (M−R), and maize-vetch (M−V). Soil microbial biomass C and P (MBC, MBP), soil respiration, metabolic quotient, P mineralization rate, and anion exchange membrane extractable P (solution P) were determined during winter and spring of 2017, and summer and autumn of 2018 at 0–0.05 and 0.05–0.10 m depth. Results indicated that differences in the relationships between MBP and MBC were mostly influenced by soil type. In the Paleustoll, this relationship showed a threshold value of 94.7 µg MBC g⁻¹ where soil microbial biomass P reached a maximum value of 6.6 ug MBP g⁻¹. No relationship between P mineralization rate and MBP was observed in this soil indicating P limitation explained by the negative relationship between exchangeable calcium and solution P. On contrary, a positive and linear relationship between MBP and MBC was found in the Ustipsamment, which was affected by the season of the year. A nonlinear relationship between metabolic quotient and MBP was found in the Ustipsamment but not in the Paleustoll. Soil management was more related to microbe-plant P competition during periods of active growth in the Paleustoll, while in the non-P limited soil (Ustipsamment), environmental conditions and the presence of active rhizosphere stimulate microbial activity, shown by seasonal variations, increasing P mineralization rates to sustain microbial and plant P demand.
The genus Mythimna Ochsenheimer, 1816 groups aproximatelly 270 species worldwide. This genus is subdivided into many subgenera and species-groups, with those species occurring in the Neotropical region included in the subgenus Mythimna (Pseudaletia) Franclemont, 1951. Species of this subgenus frequently reach high population levels, causing economic damage to Poaceae cultivars. Hence, it is crucial a well-defined taxonomy allowing rapid and precise identifications. However, the species of this subgenus are cryptic, their recognition requires molecular analyses and in-depth morphological studies, which has often resulted in misidentifications. In Brazil, the occurrence of the following species had been mentioned: Mythimna (P.) adultera (Schaus, 1894), Mythimna (P.) roraimae Franclemont, 1951, Mythimna (P.) sequax Franclemont, 1951, and Mythimna (P.) unipuncta (Haworth, 1809). Yet, until now, we lack a broader knowledge about the geographic distribution and taxonomy of these species. Thus, this study aims to revise the taxonomy of those species based on morphological and molecular (COI) data to provide an updated comprehension of this group in the country. The analysis of 1,664 specimens allowed us to confirm the presence of three species in the country: Mythimna (P.) adultera, Mythimna (P.) sequax, and Mythimna (P.) unipuncta. A lectotype for Mythimna (P.) adultera is designated; a new synonym is proposed: Pseudaletia roraimae syn. nov. of Mythimna (P.) unipuncta; and a new species, Mythimna (P.) celiae sp. nov. is described from Bagé, Rio Grande do Sul, Brazil. Keywords: Catalog; Geographic distribution; True armyworm; Morphology; Taxonomy
An important hypothesis for how plants respond to introduction to new ranges is the evolution of increased competitive ability (EICA). EICA predicts that biogeographical release from natural enemies initiates a trade‐off in which exotic species in non‐native ranges become larger and more competitive, but invest less in consumer defences, relative to populations in native ranges. This trade‐off is exceptionally complex because detecting concomitant biogeographical shifts in competitive ability and consumer defence depends upon which traits are targeted, how competition is measured, the defence chemicals quantified, whether defence chemicals do more than defend, whether ‘herbivory’ is artificial or natural, and where consumers fall on the generalist‐specialist spectrum. Previous meta‐analyses have successfully identified patterns but have yet to fully disentangle this complexity. We used meta‐analysis to reevaluate traditional metrics used to test EICA theory and then expanded on these metrics by partitioning competitive effect and competitive tolerance measures and testing Leaf‐Specific Mass in detail as a response trait. Unlike previous syntheses, our meta‐analyses detected evidence consistent with the classic trade‐off inherent to EICA. Plants from non‐native ranges imposed greater competitive effects than plants from native ranges and were less quantitatively defended than plants from native ranges. Our results for defence were not based on complex leaf chemistry, but instead were estimated from tannins, toughness traits and primarily Leaf‐Specific Mass. Species specificity occurred but did not influence the general patterns. As for all evidence for EICA‐like trade‐offs, we do not know if the biogeographical differences we found were caused by trade‐offs per se, but they are consistent with predictions derived from the overarching hypothesis. Underestimating physical leaf structure may have contributed to two decades of tepid perspectives on the trade‐offs fundamental to EICA.
The present article aims to develop a categorical duality for the category of finite distributive join-semilattices and ∧-homomorphisms (maps that preserve the joins and the meets, when they exist). This dual equivalence is a generalization of the famous categorical duality given by Birkhoff for finite distributive lattices. Moreover, we show that every finite distributive semilattice is a Hilbert algebra with supremum. We obtain some applications from the dual equivalence. We provide a dual description of the 1–1 and onto ∧-homomorphisms, and we obtain a dual characterization of some subalgebras. Finally, we present a representation for the class of finite semi-boolean algebras.
Reducing the decision-making unit to classes within fields can improve yields, efficiency in the use of nutrients and profitability of crops. The objectives were to compare methods for class delimitation in wheat (Triticum aestivum L.) crops based on apparent productivity levels and establish similarities among them in terms of spatial overlapping, productive attributes and the use of nitrogen. In three wheat fields, high and low apparent productivity classes (APC) were defined based on eight methodologies: yield maps, soil maps, gramineae vegetation index, rotation crop index, interpretation of satellite images, management records, elevation and integrated soil and yield maps. In each APC, soil and crop yield components were determined under five nitrogen fertilization levels. Among delimitation methodologies, the degree of coincidence varied from 1.4 to 81.7%. The differences in soil properties, nitrogen use efficiency and grain yields were greater among fields than among APC within each field. In each field, the delimitation methodologies identified different single factors that discriminated among the potential management classes and were partially associated with the crop grain yields. The wheat crops at the low APC yielded 39% less and 12% less than at the high APC, respectively. The nitrogen fertilization, at the rate for maximum productivity for each ACP, reduced the yield differences between contrasting APC. Nitrogen fertilization also modified clustering of classes based on expected yields. Making management classes for wheat based on expected productivity is more accurate when based on previous crop production information under similar nitrogen fertilization conditions than the targeted crop.
In arid central-west Argentina, South America, many wetlands have developed in association with rivers draining the Andean piedmont and are vital hotspots for resources. However, knowledge about their long-term evolution is generally scarce. The Bañados del Atuel wetland, a low gradient fluvio-aeolian plain linked to the Atuel-Diamante fluvial system, is analyzed to depict its geomorphological and sedimentological Holocene evolution. The study area comprises a fluvial fill terrace with fine-grained alluvial deposits (~ 4186–4419 cal years BP), deposited by a palaeodistributary fluvial system, that is covered by SW–NE oriented aeolian dune complexes. The present-day wetland, which developed after formation of the fill terrace, is characterized by: (1) a NW–SE oriented floodplain with distributary channels and fine-grained, massive to laminated deposits of low organic matter content, dated to 2755–2864 and 729–895 cal years BP, and includes SW–NE oriented dune systems and salt flat depressions; and (2) a transfer area with active headcutting channels, entrenched in the fill terrace, that connects the NW–SE oriented floodplain with (3) a saline endorheic depression (salt lake) with active deflation. The fill terrace distribution suggests much more extensive floodplain environments prior to the late Holocene; the present-day wetland is not older than the last 2–3 millennia and records a late Holocene trend of floodplain size reduction. Fluvial processes of avulsion were likely driven by mid and late Holocene El Niño Southern Oscillation (ENSO) events. Late Holocene arid conditions favoured aeolian dune formation and fluvio-aeolian interactions. Furthermore, anthropogenic river modifications, starting ~ 200 years ago, also have promoted severe changes in the Atuel-Diamante fluvial system, deepening the aridity in the wetland.
In mutualistic endophytic bacteria, the type VI secretion system (T6SS) is related to important functions, such as interbacterial competition, stress response, quorum sensing, biofilm formation, and symbiosis. The presence of T6SS in beneficial endophytic bacterial population associated with different plants suggests that it plays an important role in its interaction with the eucaryotic partner. Within plant promoting bacteria, those with phosphate solubilizing activity constitute a group of great relevance to the rhizosphere as they provide phosphorus to plants. Among them, those with endophytic colonization capacity have survival advantages. The aim of this study was to determine whether the T6SS of a native peanut phosphate solubilizing bacterium is involved in its colonization in this legume. Initially, an in silico analysis looking for genes related to T6SS in the genome of the Enterobacter sp. J49 strain enabled us to identify almost all the tss genes, except for the tssE gene. A T6SS mutant of the Enterobacter sp. J49 strain was obtained by interrupting one of the essential tss genes. Then, the Enterobacter sp. J49-hcp strain was inoculated on peanut plants to analyze its colonization capacity. In addition, properties associated with endophytic colonization were analyzed, such as the formation of biofilms and the production of pectinase and cellulase enzymes. The results obtained indicated a significant decrease in the epiphytic and endophytic colonization of the mutant with respect to the wild strain. It is possible to conclude that T6SS, although not essential, may participate in bacterial colonization, either by accelerating the infection or by promoting other mechanisms involved in it.
Cystic echinococcosis (CE) is a zoonosis caused by species of the complex Echinococcus granulosus, sensu lato in their larval stage. It is an endemic disease in the province of Río Negro, where small farmers generally have both sheep and goats. Lamb vaccination with EG95 was incorporated in 2009 with very good results: in fact, it contributed to a significant drop in prevalence of infection in both sheep and goats, when determined by necropsy and serology in 2018. In the design of the activity, it was decided not to vaccinate goats in order to minimize the operational requirements of vaccination and comments from producers about the rarity of observing hydatid cysts in goat viscera were considered. Objective To identify causes which can still generate infection in dogs, and to detect species/genotypes in circulation in the province of Río Negro. Materials and Methods In indigenous reserves comprised within the area of lamb vaccination with 3 doses of EG95, (dose 1 in December, dose 2 in January and dose 3 in December of the year following, at the time of application of dose 1 to the new lambs). Prevalence in adult goats and sheep was determined by necropsy and serology (ELISA). Infective species/genotypes present in the work area and in the rest of the province of Río Negro were identified by Cox1 mitochondrial gene sequencing. Epidemiological analysis was completed with surveys among farmers about slaughter habits for human consumption. Results Through serology and necropsy, infection rates in vaccinated and nonvaccinated sheep were significantly different (21% versus 66%). Non-vaccinated sheep and non-vaccinated goats were also significantly different in that there was less infection in goats compared to sheep (7% versus 66% for necropsy, 30% versus 61% for serology); After many years of sheep vaccination the infection positives were low, and differences between vaccinated sheep and non-vaccinated goats turned out non-significant (21% versus 7%). With reference to epidemiology and control along the period 2018- 2022, PZQ dosing of dogs 4 times a year was maintained, and 2 extra deworming tasks were introduced together with dose 1 and 2 of EG95, performed by the veterinary vaccination team, ensuring the ingestion of PZQ by dogs. Assessment of animal slaughter for consumption in 41 producers showed that 21 of them slaughter a monthly average of 18 goats (an average of 0.43 goat per month per farm) and 36 in all slaughter 35 old sheep in a year (average of 0.85 sheep per month per farm). With respect to identification of species/genotypes as from 2010, genotypes G1 have been found in 11 sheep (out of which 6 belong to vaccination zone) and genotypes G7, in one pig. A goat cyst within vaccination zone turned out unfertile and it was not possible to sequence it. Conclusion Design and implementation of a vaccine programme combined with the use of PZQ resulted as cost-effective, since it was possible to maintain the vaccine over time, with clear impact on prevalence decrease in sheep and goats.
Calyptocephalella is nowadays only represented by the emblematic Chilean Helmeted Water Toad C. gayi, restricted to water bodies of Central Chile. Numerous fossil remains from latest Cretaceous to Miocene sedimentary rocks at the east of Los Andes have been attributed to this genus and several extinct Calyptocephalella species were erected. The relationships of these taxa, including the monophyly of the genus and the validity of some species, are however still unresolved. Here, we described a fossil anuran from the late Miocene of the northern Argentine Patagonia, which we attributed to a new extinct species of Calyptocephalella after analyzing the osteology and shared characters of all presumed species of the genus. These characters, whose co-occurrence seems to be exclusive of Calyptocephalella, include ornamented skull, extensive nasal processes contacting maxillae, broad nasal-frontoparietal contact, occipital artery enclosed by bone, maxilla contributing to the orbital margin and contacting squamosal, squamosal zygomatic and otic rami forming a continuous plate, scapula with a well-developed anterior lamina, and high iliac dorsal crest. The new species is differentiable in the proportion of the maxillary partes, triangular maxillary postorbital process, narrow maxillary contribution to the orbital margin; an oblique frontoparietal-squamosal suture. We also analyzed the putative morphological and ecological diversity of Calyptocephalella along the geological record, from which this fossil is nowadays the youngest and northernmost record east of Los Andes. We concluded that Calyptocephalella would be a successful lineage that inhabited Patagonia since, probably, the latest Cretaceous and during most of the Cenozoic, whose diversification might be related with the environmental changes that took place in southern South America during the these times, and from which C. gayi is only a vestigial representative.
Due to the present pandemic situation and the many animal species epidemiologically involved, a renewed interest has surged to investigate the coronavirus population circulating in wildlife, specially bats and rodents as potential reservoirs of new human pathogens. In Argentina, information about the viruses present in these mammals is very reduced. To investigate the presence of coronaviruses in this country, we obtained 457 samples from hematophagous, insectivorous, and frugivorous bats and rodents from two regions of Argentina. We report here the detection of alphacoronaviruses sequences in the three groups of bats as well as in rodents. Phylogenetic analysis showed the closest relationships to alphacoronaviruses from Brazil.
Among extinct sloths, Nothrotheriidae nothrotheriines are characterised by caniniforms (when present) separated by a diastema from the molariform tooth row and quadrangular, rectangular or trapezoidal molariforms with longitudinal grooves on the lingual and labial surfaces. The subfamily Nothrotheriinae is recorded from the Middle Miocene of Bolivia and Argentina to the Pleistocene of different regions of South America, Central America and North America. Neogene well-known representatives include Pronothrotherium, Huilabradys, Mionothropus, Aymaratherium, Lakukullus and the recently defined genus Mcdonaldocnus, whose remains were found from Argentina, Colombia, Uruguay, Peru, Brazil and Bolivia. Mcdonaldocnus includes materials from Argentina and Bolivia previously assigned as ‘Xyophorus’. New records from Late Miocene levels of the Cerro Azul Formation cropping out in the Chasicó creek locality, Buenos Aires Province, and in the localities of Telén and Loventué, La Pampa Province, allow us to describe cranio-dental remains of Nothrotheriinae Mcdonaldocnus bondesioi and Mcdonaldocnus sp., respectively. The identification of Mcdonaldocnus sp. in the Cerro Azul Formation at La Pampa Province constitutes the first record of Nothrotheriinae for this province.
Ultrafine fiber membranes of polylactic acid (PLA) 8% (w/v) loaded with pink pepper essential oil (PPEO) in 10, 20 and 30% (w/v) were produced and evaluated for antimicrobial potential against the bacteria Escherichia coli, Salmonella enteritidis, Listeria monocytogenes and Staphylococcus aureus. The membranes were applied in simulated cream cheese packaging and characterized by morphological, thermal, structural, antimicrobial and wettability analysis. The addition of PPEO reduced the diameter of fibers and increased the initial degradation temperature in relation to pure PPEO. The PPEO presented myrcene as major component and had antimicrobial action for S. aureus and L. monocytogenes. The membranes applied to the cream cheese packaging showed inhibitory effect on the 21st day of storage, for L. monocytogenes. For S. aureus, the membranes inhibited the growth of the colonies on days 14 and 21, with reductions of 30 and 62%, respectively. Finally, the ultrafine membranes had hydrophobic character.
Dispersal is the process by which individuals move through different sites away from their natal place during their life. Many factors can regulate dispersal movements of individuals, from intrinsic characteristics of the individuals to environmental conditions. Here, we report American Kestrel (Falco sparverius) natal dispersal in central Argentina and analyse some of the factors that can modulate it. We also report information on breeding dispersal, and nest box fidelity, using banding data from 2011 to 2019. The number of kestrels banded was high, but only 5.59% of birds were recaptured or re-sighted. Part of the American Kestrel population is philopatric, and most kestrels were detected breeding at 1 year of age for the first time (41.38%). Kestrels bred from one (mostly) to 6 years in the same nest box. Natal dispersal ranged from 2 to 36.9 km, and females dispersed longer distances than males. We did not record kestrels dispersing between the different sampling sites, but we recovered two dead dispersing juveniles more than 200 km from their natal nest, suggesting some long-distance dispersal may occur in our studied population. Further banding studies or better, studies based on the tagging of American Kestrels with GPS tracking devices will certainly be needed to better understand dispersal movements and factors that modulate these dispersal patterns in South America. ARTICLE HISTORY
In this article, we consider the best polynomial approximation operator defined on an Orlicz-Lorentz space $\Lambda_{w,\phi}$ generated by an Orlicz function $\phi$ and a non-negative continuous weight function $w$. Then we extend the best polynomial approximation operator from $\Lambda_{w,\phi}$ to $\Lambda_{w,\phi'}$, where $\phi'$ is the derivative function of $\phi$. In addition, we establish some properties of the extended best polynomial approximation operator
Dyrda and Prucnal gave a Hilbert-style axiomatization for the {∧,∨}\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\{\wedge ,\vee \}$$\end{document}-fragment of classical propositional logic. Their proof of completeness follows a different approach to the standard one proving the completeness of classical propositional logic. In this note, we present an alternative proof of Dyrda and Prucnal’s result following the standard arguments which prove the completeness of classical propositional logic.
Pseudoryzomys simplex (Winge 1887) is a small to medium sized terrestrial oryzomyine rodent (Cricetidae, Sigmodontinae) widely distributed in humid environments of tropical and subtropical lowlands of South America with a marked rainy season. The occurrence of this species in the south-central Pampean region between 4700 and 200 ka cal BP was originally associated with some warm climatic episodes. A later hypothesis points out that P. simplex was a typical element of the Humid Pampa subregion during this period, whose distribution was retracted to the north due to the strong anthropic modifications in the area. To corroborate these hypotheses, the niche of occurrence of P. simplex was calculated to analyse the preferred climatic conditions of contemporaneous and fossil record of the species since 4700 ka cal BP. The derived climatic niche of P. simplex shows a marked preference for areas with seasonality precipitation patterns and tropical/subtropical conditions. Geographical estimations and climatic niches derived revealed a moderate overlapping between contemporaneous and Pampean late-Holocene projection, which in no case includes the localities where fossil data were found. Although a better comprehension of the ecological requirements of the species is necessary to discard a shift in its realized climatic niche, it is probable that P. simplex is able to maintain stable populations under similar conditions to the ones represented by fossil occurrences. The distribution of the species in the Humid Pampa subregion is probably affected by non-climatic factors today which are reducing its contemporaneous realized climatic niche and distorting the derived climatic niches obtained. These results support that this species cannot be considered a reliable palaeoclimatic indicator of more Brazilian conditions in the Humid Pampean subregion during the past.
We study the propositional logic SDN$\mathcal {S}_\mathbb {DN}$ associated with the variety of distributive nearlattices DN$\mathbb {DN}$. We prove that the logic SDN$\mathcal {S}_\mathbb {DN}$ coincides with the assertional logic associated with the variety DN$\mathbb {DN}$ and with the order‐based logic associated with DN$\mathbb {DN}$. We obtain a characterization of the reduced matrix models of logic SDN$\mathcal {S}_\mathbb {DN}$. We develop a connection between the logic SDN$\mathcal {S}_\mathbb {DN}$ and the {∧,∨,⊤}$\lbrace \wedge ,\vee ,\top \rbrace$‐fragment of classical logic. Finally, we present two Hilbert‐style axiomatizations for the logic SDN$\mathcal {S}_\mathbb {DN}$.
The Atuel - Diamante distributary fluvial system (AD - DFS; ∼34.5–37.5ºS, 66.5–68.5ºW) is a late Quaternary major landscape feature in the distal dry Andean piedmont of Argentina. A widely extended fluvial terrace in the proximal setting of the fluvial system records the Early and Middle Holocene (E − MH). Considering that climate reconstructions from central-western Argentina have suggested an arid Middle Holocene scenario in the region, three main objectives were proposed to be achieved based on the analysis of the AD - DFS fluvial terrace, 1) to infer E − MH palaeoenvironments, 2) to disentangle the E − MH vegetation dynamics and 3) to contribute to the understanding of control factors at the AD - DFS during the E− MH Holocene. We present results of sedimentary successions logging and description, and lithofacies and palynological analyses constrained by radiocarbon dating at four localities at the AD - DFS proximal setting. Sedimentary analysis reveals an E − MH fluvial aggradational plain recording mainly floodplain environments and secondarily fluvial channel elements. The floodplain is interpreted as an unconfined vertical-accretion sandy floodplain that shifts to a confined cut and fill floodplain type after a fluvial incision likely at the late Middle Holocene. The fossil pollen records a fluvial system with major water availability at the earliest Early Holocene (EH). Then, a major environmental change after 10,230–10,487 cal yrs. BP is marked by a deficit in water availability affecting the algae, macrophytes and riparian communities (Poaceae). After 9133–9535 cal yrs. BP, and before 7163–7422 cal yrs. BP, the Monte and Monte-Espinal elements increased and reached the highest values of Prosopis (60–80%) linked to low values of Poaceae and Ephedra spp. This condition is hypothesized to be associated with driest and warmest conditions during the MH in the Andean piedmont. The reconstructed paleoenvironmental scenario, higher flow at the fluvial system at the earliest EH and aridity in the piedmont during the MH, is in agreement with the regional climatic framework established for the Andean piedmont region.
The rapidly evolving Coronavirus Disease 2019 (COVID-19) pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide with thousands of deaths and infected cases. For the identification of effective treatments against this disease, the main protease (Mpro) of SARS‑CoV‑2 was found to be an attractive drug target, as it played a central role in viral replication and transcription. Here, we report the results of high-throughput molecular docking with 1,045,468 ligands’ structures from 116 kinds of traditional Chinese medicine (TCM). Subsequently, 465 promising candidates were obtained, showing high binding affinities. The dynamic simulation, ADMET (absorption, distribution, metabolism, excretion and toxicity) and drug-likeness properties were further analyzed the screened docking results. Basing on these simulation results, 23 kinds of Chinese herbal extracts were employed to study their inhibitory activity for Mpro of SARS‑CoV‑2. Plants extracts from Forsythiae Fructus, Radix Puerariae, Radix astragali, Anemarrhenae Rhizoma showed acceptable inhibitory efficiencies, which were over 70 %. The best candidate was Anemarrhenae Rhizoma, reaching 78.9%.
In the biosynthesis of menaquinone in bacteria, the thiamine diphosphate‐dependent enzyme MenD catalyzes the decarboxylative carboligation of α‐ketoglutarate and isochorismate to (1R,2S,5S,6S)‐2‐succinyl‐5‐enolpyruvyl‐6‐hydroxycyclohex‐3‐ene‐1‐carboxylate (SEPHCHC). The regioisomer of SEPHCHC, namely (1R,5S,6S)‐2‐succinyl‐5‐enolpyruvyl‐6‐hydroxycyclohex‐2‐ene‐1‐carboxylate (iso‐SEPHCHC), has been considered as a possible product, however, its existence has been doubtful due to a spontaneous elimination of pyruvate from SEPHCHC to 2‐succinyl‐6‐hydroxy‐2,4‐cyclohexadiene‐1‐carboxylate (SHCHC). In this work, the regioisomer iso‐SEPHCHC was distinguished from SEPHCHC by liquid chromatography‐tandem mass spectrometry. Iso‐SEPHCHC was purified and identified by NMR spectroscopy. Just as SEPHCHC remained hidden as a MenD product for more than two decades, its regioisomer iso‐SEPHCHC has remained until now. Elusive isomer: The shikimate pathway has been studied over decades, but the metabolite iso‐SEPHCHC remained hidden until now.
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303 members
Gustavo Luis Ferri
  • Faculty of Natural Sciences
Anibal Prina
  • Faculty of Agronomy
Javier D Breccia
  • Faculty of Natural Sciences
Isabel Gigli
  • Faculty of Agronomy
Claudia I. Montalvo
  • Faculty of Natural Sciences
Santa Rosa, La Pampa, Argentina