Search results for: José M. Méndez

Items from 1 to 20 out of 29 results

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Amino acid‐decorated mesoporous silica nanoparticles loaded with titanocene derivatives for targeted anticancer studies

Michael Aondona Iorhemba, Karina Ovejero‐Paredes, Diana Díaz‐García, Victoria García‐Almodóvar, more

Applied Organometallic Chemistry > 38 > 6 > n/a - n/a

Nanostructured materials possess promising potential for cancer therapy through precise adjustment of their functionalization and physicochemical attributes. This study primarily focuses on the synthesis and characterization of mesoporous silica nanoparticles (MSN) that are functionalized with titanocene dichloride (a therapeutic agent) and one of several amino acids—cysteine, captopril, penicillamine,...

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A Note on Gödel-Dummet Logic LC

Gemma Robles, José M. Méndez

Bulletin of the Section of Logic > 2021 > 50 > 3 > 325-335

Let $A_{0},A_{1},...,A_{n}$ be (possibly) distintict wffs, $n$ being an odd number equal to or greater than 1. Intuitionistic Propositional Logic IPC plus the axiom $(A_{0}\rightarrow A_{1})\vee ...\vee (A_{n-1}\rightarrow A_{n})\vee (A_{n}\rightarrow A_{0})$ is equivalent to Gödel-Dummett logic LC. However, if $n$ is an even number equal to or greater than 2, IPC plus the said axiom is a...

article

Cover Feature: Silver(I)‐Mediated Base Pairs in DNA Sequences Containing 7‐Deazaguanine/Cytosine: towards DNA with Entirely Metallated Watson–Crick Base Pairs (Chem. Eur. J. 18/2018)

José M. Méndez‐Arriaga, Carmen R. Maldonado, José A. Dobado, Miguel A. Galindo

Chemistry – A European Journal > 24 > 18 > 4469 - 4469

This work shows the metallation of DNA molecules containing Watson–Crick base pairs ^7CG‐C, where the guanine nucleobase has been replaced by its 7‐deazapurine analogue. These deaza‐DNA molecules can be initially assembled by using the Watson–Crick pairing rules, and the addition of silver(I) ions leads to the formation of silver–DNA molecules, comprising ^7CG–Ag^I–C base pairs, that preserve their initial...

article

Silver(I)‐Mediated Base Pairs in DNA Sequences Containing 7‐Deazaguanine/Cytosine: towards DNA with Entirely Metallated Watson–Crick Base Pairs

José M. Méndez‐Arriaga, Carmen R. Maldonado, José A. Dobado, Miguel A. Galindo

Chemistry – A European Journal > 24 > 18 > 4583 - 4589

DNA sequences comprising noncanonical 7‐deazaguanine (^7CG) and canonical cytosine (C) are capable of forming Watson–Crick base pairs via hydrogen bonds as well as silver(I)‐mediated base pairs by coordination to central silver(I) ions. Duplexes I and II containing ^7CG and C have been synthesized and characterized. The incorporation of silver(I) ions into these duplexes has been studied by means of...

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4‐Aryl‐2‐ferrocenyl‐ and 2‐Aryl‐4‐ferrocenyl‐2,3‐dihydro‐1,5‐benzothiazepines with Potentially Biological Activities: Synthesis, Characterization, X‐ray Diffraction Studies

Elena I. Klimova, Miguel A. Gallardo Vega, Jessica J. Sánchez García, Marcos Flores‐Alamo, more

Journal of Heterocyclic Chemistry > 53 > 6 > 1990 - 1998

A series of novel 4‐aryl‐2‐ferrocenyl‐ and 2‐aryl‐4‐ferrocenyl‐2,3‐dihydro‐1,5‐benzothiazepines and was obtained by the condensation of 1‐aryl‐3‐ferrocenyl‐ and 3‐aryl‐1‐ferrocenyl‐2‐propenones and , respectively, with o‐aminothiophenol in the presence of AcOH and HCl (~64–91%). Their structures were established based on the spectroscopic data and X‐ray diffraction analysis of the compounds , ,...

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Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

Noelia Santamaría‐Díaz, José M. Méndez‐Arriaga, Juan M. Salas, Miguel A. Galindo

Angewandte Chemie International Edition > 55 > 21 > 6170 - 6174

The oligonucleotide d(TX)₉, which consists of an octadecamer sequence with alternating non‐canonical 7‐deazaadenine (X) and canonical thymine (T) as the nucleobases, was synthesized and shown to hybridize into double‐stranded DNA through the formation of hydrogen‐bonded Watson–Crick base pairs. dsDNA with metal‐mediated base pairs was then obtained by selectively replacing W‐C hydrogen bonds by coordination...

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Frontispiz: Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

Noelia Santamaría‐Díaz, José M. Méndez‐Arriaga, Juan M. Salas, Miguel A. Galindo

Angewandte Chemie > 128 > 21 > n/a - n/a

DNA‐Strukturen In der Zuschrift auf S. 6278 ff. beschreiben M. A. Galindo et al. den Austausch von Wasserstoffbrücken in einem doppelsträngigen Oligonukleotid aus den Nukleobasen 7‐Deazaadenin und Thymin durch Silber(I)‐Koordinationsbindungen.

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Frontispiece: Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

Noelia Santamaría‐Díaz, José M. Méndez‐Arriaga, Juan M. Salas, Miguel A. Galindo

Angewandte Chemie International Edition > 55 > 21 > n/a - n/a

DNA Structures In their Communication on page 6170 ff., M. A. Galindo et al. substitute hydrogen bonds in a double‐stranded oligonucleotide comprising Watson–Crick‐paired 7‐deazaadenine and thymine with silver(I) coordination bonds.

article

Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

Noelia Santamaría‐Díaz, José M. Méndez‐Arriaga, Juan M. Salas, Miguel A. Galindo

Angewandte Chemie > 128 > 21 > 6278 - 6282

article

An Interpretation of Łukasiewicz’s 4-Valued Modal Logic

José M. Méndez, Gemma Robles, Francisco Salto

Journal of Philosophical Logic > 2016 > 45 > 1 > 73-87

A simple, bivalent semantics is defined for Łukasiewicz’s 4-valued modal logic Łm4. It is shown that according to this semantics, the essential presupposition underlying Łm4 is the following: A is a theorem iff A is true conforming to both the reductionist (rt) and possibilist (pt) theses defined as follows: rt: the value (in a bivalent sense) of modal formulas is equivalent to the value of their...

article

Strengthening Brady’s Paraconsistent 4-Valued Logic BN4 with Truth-Functional Modal Operators

José M. Méndez, Gemma Robles

Journal of Logic, Language and Information > 2016 > 25 > 2 > 163-189

Łukasiewicz presented two different analyses of modal notions by means of many-valued logics: (1) the linearly ordered systems Ł3,..., ,..., $$\hbox {L}_{\omega }$$ L ω ; (2) the 4-valued logic Ł he defined in the last years of his career. Unfortunately, all these systems contain “Łukasiewicz type (modal) paradoxes”. On the other hand, Brady’s 4-valued logic BN4 is the basic 4-valued...

article

A Strong and Rich 4-Valued Modal Logic Without Łukasiewicz-Type Paradoxes

José M. Méndez, Gemma Robles

Logica Universalis > 2015 > 9 > 4 > 501-522

The aim of this paper is to introduce an alternative to Łukasiewicz’s 4-valued modal logic Ł. As it is known, Ł is afflicted by “Łukasiewicz (modal) type paradoxes”. The logic we define, PŁ4, is a strong paraconsistent and paracomplete 4-valued modal logic free from this type of paradoxes. PŁ4 is determined by the degree of truth-preserving consequence relation defined on the ordered set of values...

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Dual Equivalent Two-valued Under-determined and Over-determined Interpretations for Łukasiewicz’s 3-valued Logic Ł3

Gemma Robles, Francisco Salto, José M. Méndez

Journal of Philosophical Logic > 2014 > 43 > 2-3 > 303-332

Łukasiewicz three-valued logic Ł3 is often understood as the set of all 3-valued valid formulas according to Łukasiewicz’s 3-valued matrices. Following Wojcicki, in addition, we shall consider two alternative interpretations of Ł3: “well-determined” Ł3a and “truth-preserving” Ł3b defined by two different consequence relations on the 3-valued matrices. The aim of this paper is to provide (by using...

article

Blocking the Routes to Triviality with Depth Relevance

Gemma Robles, José M. Méndez

Journal of Logic, Language and Information > 2014 > 23 > 4 > 493-526

In Rogerson and Restall’s (J Philos Log 36, 2006, p. 435), the “class of implication formulas known to trivialize (NC)” (NC abbreviates “naïve comprehension”) is recorded. The aim of this paper is to show how to invalidate any member in this class by using “weak relevant model structures”. Weak relevant model structures verify deep relevant logics only.

article

Curry’s Paradox, Generalized Modus Ponens Axiom and Depth Relevance

Gemma Robles, José M. Méndez

Studia Logica > 2014 > 102 > 1 > 185-217

“Weak relevant model structures” (wr-ms) are defined on “weak relevant matrices” by generalizing Brady’s model structure $${\mathcal{M}_{\rm CL}}$$ built upon Meyer’s Crystal matrix CL. It is shown how to falsify in any wr-ms the Generalized Modus Ponens axiom and similar schemes used to derive Curry’s Paradox. In the last section of the paper we discuss how to extend this method of falsification...

article

Cyclodimerization reactions of the β-ferrocenylvinyl(methyl)ketones in the presence of zinc-organic compounds

Elena I. Klimova, Marcos Flores-Alamo, Jessica J. Sanchez García, Mark E. Martínez-Klimov, more

Journal of Organometallic Chemistry > 2013 > 731 > Complete > 29-34

Trans-ferrocenyl-3-buten-2-one 1 undergoes cyclic dimerization with formation of 4-acetyl-3,5-diferrocenylcyclohexanone 5 and 5,8-diferrocenyl-1-hydroxybicyclo-[2.2.2.]octan-3-one 6 in the presence of cyclohexenes and 2-PyZnBr or Me ₂ Zn. No adducts of the Diels–Alder reaction of compound 1 in its enolic form with cyclohexenes were observed. Under similar conditions, in the absence of cyclohexenes...

article

Factors determining tautomeric equilibria in Schiff bases

Martha Flores-Leonar, Nuria Esturau-Escofet, José M. Méndez-Stivalet, Armando Marı´n-Becerra, more

Journal of Molecular Structure > 2011 > 1006 > 1-3 > 600-605

Schiff bases derived from o-hydroxyaldehydes present keto and enol tautomeric forms; the relative equilibrium between these two tautomers depending on the particular aldehyde the Schiff bases is derived from. Thus benzaldehyde produces a stable enol tautomer, while a naphthaldehyde produces a mixture of keto and enol tautomers. The energy difference between these tautomers is very small (∼5kJ/mol)...

article

A modal restriction of R-Mingle with the variable-sharing property

Gemma Robles, José M. Méndez, Francisco Salto

Logic and Logical Philosophy > 2010 > 19 > 4 > 341–351

A restriction of R-Mingle with the variable-sharing property and the Ackermann properties is defined. From an intuitive semantical point of view, this restriction is an alternative to Anderson and Belnap’s logic of entailment E.

article

Erratum to: The Compatibility of Relevance and Mingle

José M. Méndez

Journal of Philosophical Logic > 2010 > 39 > 3 > 339-339

The online version of the original article can be found at http://dx.doi.org/10.1007/BF00247955 .

article

A Routley-Meyer Type Semantics for Relevant Logics Including B_r Plus the Disjunctive Syllogism

Gemma Robles, José M. Méndez

Journal of Philosophical Logic > 2010 > 39 > 2 > 139-158

Routley-Meyer type ternary relational semantics are defined for relevant logics including Routley and Meyer’s basic logic B plus the reductio rule $\vdash A\rightarrow \lnot A\Rightarrow \vdash \lnot A$ and the disjunctive syllogism. Standard relevant logics such as E and R (plus γ) and Ackermann’s logics of ‘strenge Implikation’ Π and Π^′ are among the logics considered.

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INFONA - science communication portal

Search results for: José M. Méndez

Amino acid‐decorated mesoporous silica nanoparticles loaded with titanocene derivatives for targeted anticancer studies

A Note on Gödel-Dummet Logic LC

Cover Feature: Silver(I)‐Mediated Base Pairs in DNA Sequences Containing 7‐Deazaguanine/Cytosine: towards DNA with Entirely Metallated Watson–Crick Base Pairs (Chem. Eur. J. 18/2018)

Silver(I)‐Mediated Base Pairs in DNA Sequences Containing 7‐Deazaguanine/Cytosine: towards DNA with Entirely Metallated Watson–Crick Base Pairs

4‐Aryl‐2‐ferrocenyl‐ and 2‐Aryl‐4‐ferrocenyl‐2,3‐dihydro‐1,5‐benzothiazepines with Potentially Biological Activities: Synthesis, Characterization, X‐ray Diffraction Studies

Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

Frontispiz: Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

Frontispiece: Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

Highly Stable Double‐Stranded DNA Containing Sequential Silver(I)‐Mediated 7‐Deazaadenine/Thymine Watson–Crick Base Pairs

An Interpretation of Łukasiewicz’s 4-Valued Modal Logic

Strengthening Brady’s Paraconsistent 4-Valued Logic BN4 with Truth-Functional Modal Operators

A Strong and Rich 4-Valued Modal Logic Without Łukasiewicz-Type Paradoxes

Dual Equivalent Two-valued Under-determined and Over-determined Interpretations for Łukasiewicz’s 3-valued Logic Ł3

Blocking the Routes to Triviality with Depth Relevance

Curry’s Paradox, Generalized Modus Ponens Axiom and Depth Relevance

Cyclodimerization reactions of the β-ferrocenylvinyl(methyl)ketones in the presence of zinc-organic compounds

Factors determining tautomeric equilibria in Schiff bases

A modal restriction of R-Mingle with the variable-sharing property

Erratum to: The Compatibility of Relevance and Mingle

A Routley-Meyer Type Semantics for Relevant Logics Including B_r Plus the Disjunctive Syllogism

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