Evaluación química y sensorial del jamón serrano en el callejón de Huaylas

En el callejón de Huaylas se expenden jamones elaborados artesanalmente sin tomar en cuenta los criterios tecnológicos. En la etapa del curado seco utilizan sales de nitrato (salitre) en cantidades inadecuadas, como por ejemplo adición en cucharadas que no permiten una correcta dosificación de acuerdo a las normas estándares de calidad. El riesgo del uso de nitratos y nitritos es la formación de nitrosaminas, substancias que son agentes cancerígenos. La hipótesis que se planteó en el presente trabajo de investigación es si se realiza el análisis químico y sensorial del jamón serrano en el callejón de Huaylas, entonces se determinará su nivel de calidad del producto

New family of myrmecophilic spiders.

24 pages : illustrations (some color), maps (some color) ; 26 cm.The new genus and species Myrmecicultor chihuahuensis Ramírez, Grismado, and Ubick is described and proposed as the type of the new family, Myrmecicultoridae Ramírez, Grismado, and Ubick. The species is ecribellate, with entelegyne genitalia, two tarsal claws, without claw tufts, and the males have a retrolateral palpal tibial apophysis. Some morphological characters suggest a possible relationship with Zodariidae or Prodidomidae, but the phylogenetic analysis of six markers from the mitochondrial (12S rDNA, 16S rDNA, cytochrome oxidase subunit I) and nuclear (histone H3, 18S rDNA, 28S rDNA) genomes indicate that M. chihuahuensis is a separate lineage emerging near the base of the Dionycha and the Oval Calamistrum clade. The same result is obtained when the molecular data are combined with a dataset of morphological characters. Specimens of M. chihuahuensis were found associated with three species of harvester ants, Pogonomyrmex rugosus, Novomessor albisetosis, and Novomessor cockerelli, and were collected in pitfall traps when the ants are most active. The known distribution spans the Big Bend region of Texas (Presidio, Brewster, and Hudspeth counties), to Coahuila (Cuatro Ciénegas) and Aguascalientes (Tepezalá), Mexico

Historia de la agroecología en México

A mediados del siglo pasado, existían dos tipos de científicos de la agronomía en México. Unos, que veían una agricultura atrasada y que había, ciegamente, que llevar hacia los avances tec- nológicos más modernos. Otros, que salían al campo y exploraban intensivamente los sistemas indígenas y campesinos. El estudiar y dar a conocer la riqueza tanto biológica como humana que albergaban estos sistemas, dio pie a la agroecología en este país. Sobra decir que varios de los pioneros de esa ciencia a nivel mundial, fueron aprendices de sistemas indígenas mexicanos. En este trabajo se hace el esfuerzo por narrar los hitos históricos más importantes en la investigación y la enseñanza de la agroecología en el pasado y en la actualidad; además, hacemos también una reflexión sobre los desafíos que enfrenta esa disciplina

Prompt and nonprompt ψ (2S) production in pPb collisions at √sNN = 8. 16 TeV

The production of ψ(2S) mesons in proton-lead collisions at a centre-of-mass energy per nucleon pair of √sNN = 8.16 TeV is studied with the LHCb detector using data corresponding to an integrated luminosity of 34 nb−1. The prompt and nonprompt ψ(2S) production cross-sections and the ratio of the ψ(2S) to J/ψ cross-section are measured as a function of the meson transverse momentum and rapidity in the nucleon-nucleon centre-of-mass frame, together with forward-to-backward ratios and nuclear modification factors. The production of prompt ψ(2S) is observed to be more suppressed compared to pp collisions than the prompt J/ψ production, while the nonprompt productions have similar suppression factors

Search for CP violation in the phase space of D0 → KS0K±π∓ decays with the energy test

A search for CP violation in D0 → KS0K+π− and D0 → KS0K−π+ decays is reported. The search is performed using an unbinned model-independent method known as the energy test that probes local CP violation in the phase space of the decays. The data analysed correspond to an integrated luminosity of 5.4 fb−1 collected in proton-proton collisions by the LHCb experiment at a centre-of-mass energy of √s = 13 TeV, amounting to approximately 950 thousand and 620 thousand signal candidates for the D0 → KS0K−π+ and D0 → KS0K+π− modes, respectively. The method is validated using D0 → K−π+π−π+ and D0 → KS0π+π− decays, where CP-violating effects are expected to be negligible, and using background-enhanced regions of the signal decays. The results are consistent with CP symmetry in both the D0 → KS0K−π+ and the D0 → KS0K+π− decays, with p-values for the hypothesis of no CP violation of 70% and 66%, respectively

Measurement of the CKM angle γ using the B± → D*h± channels

A measurement of the CP-violating observables from B± → D*K± and B± → D*π± decays is presented, where D*(D) is an admixture of D*0 and D¯∗0 (D0 and D¯0) states and is reconstructed through the decay chains D*→ Dπ0/γ and D→KS0π+π−/KS0K+K−. The measurement is performed by analysing the signal yield variation across the D decay phase space and is independent of any amplitude model. The data sample used was collected by the LHCb experiment in proton-proton collisions and corresponds to a total integrated luminosity of 9 fb−1 at centre-of-mass energies of 7, 8 and 13 TeV. The CKM angle γ is determined to be 69−14+13∘ using the measured CP-violating observables. The hadronic parameters rBD∗K±, rBD∗π±, δBD∗K±, δBD∗π±, which are the ratios and strong phase differences between favoured and suppressed B± decays, are also reported

Revision and phylogeny of the genus Monapia with notes on other Amaurobioidinae (Araneae, Anyphaenidae)

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