Ignacio Ruiz - Academia.edu (original) (raw)

Papers by Ignacio Ruiz

Se presenta informacion general de 112 especies de plantas susceptibles de manejo para uso en jar... more Se presenta informacion general de 112 especies de plantas susceptibles de manejo para uso en jardinería y parques urbanos.

Acta botánica Mexicana

Se describe e ilustra Hechtia purhepecha del estado de Michoacán, México. El nuevo taxon se compa... more Se describe e ilustra Hechtia purhepecha del estado de Michoacán, México. El nuevo taxon se compara con H. laxissima, especie con características similares. Se registra por primera vez para el estado de Michoacán a Tillandsia guenther-nolleri Ehlers, hasta ahora solo conocida de Colima y Jalisco. Hechtia purhepecha, a new species from Michoacán, Mexico is described and illustrated. The new taxon is compared with H. laxissima, a species with similar characteristics. Tillandsia guenther-nolleri Ehlers, a taxon known until now only from Colima and Jalisco, is recorded for the first time for the state of Michoacán.

In order to characterize populations of wild tomato ("tinguaraque") in the Mexican Stat... more In order to characterize populations of wild tomato ("tinguaraque") in the Mexican State of Michoacan, field observations were made from January to September of 2007. Three regions were selected: "Valle de Apatzingan", "Valle de Los Reyes" and "Cienega de Chapala". Through interviews to farmers and previous studies, more particular samplings were made in each region. The characterization included: environmental, morphological, physiological and entomological aspects. In 45% of the visited sites, populations of the wild tomato were recorded. They were located in altitudes from 314 to 1 550 m; precipitation of 751 to 1 014 mm per year, maximum and minimum temperatures of 35.2 and 11.7°C, and varied levels of soil fertility. Registered populations correspond to the species Solanum lycopersicum L. (var. cerasiforme), of which two groups could be distinguished: big fruits (2.12 to 2.23 x 2.41 to 2.55 cm) and small fruits (1.05 to 1.22 x 1.10 to 1.2...

Revista colombiana de entomología

Multi-Conference on Systemics, Cybernetics and Informatics, 2001

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Lecture Notes in Computer Science, 2007

Currently, one of the main issues of Human Computer Interaction (HCI) in the area of e-Health is ... more Currently, one of the main issues of Human Computer Interaction (HCI) in the area of e-Health is the design of telemedicine services based on the study of interactions established between people and new technologies. Nevertheless, the research in HCI has been mainly focused from a cognitive point of view, and most studies don't consider other variables related to the social impact of technology. This gap is extremely important in e-Health, because Information Systems (IS) changes qualitatively work processes in health organizations. In this paper we present an interdisciplinary perspective that includes the cognitive and organizational aspects to the technical design of new e-Health services in the area of telecardiology. The results obtained permit to accurately define not only technical requirements and network resources management, but also user requirements, contextual particularities of the scenarios where these services could be implemented and the IS impact in organizational processes. Moreover, the ethnographical methodology proposed has been applied to specific emergencies scenarios, obtaining conclusions that allow new user-centered designs that can be directly integrated in medical practice in an efficient way.

CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006., 2006

Service (QoS) estimation system for Internet accesses specially aimed at real-time multimedia app... more Service (QoS) estimation system for Internet accesses specially aimed at real-time multimedia applications. The system is capable of estimating access capacity, available bandwidth and delay as the critical QoS parameters for this kind of applications, and to do it from the point of view of the final user. The algorithm selected for QoS estimations is one-way, and is based on the packet train technique. The system has been developed following the client-server model, where a central web server contains, among other things, the Java applet that implements the client side of the system, and has been validated using several commercial Internet accesses with different technologies: analog modem, Asymmetric Digital Subscriber Loop (ADSL), cable modem and Universal Mobile Telecommunications System (UMTS).

The European Symposium on Artificial Neural Networks, 2001

In this article, a real-coded genetic algorithm (GA) is proposed capable of simultaneously optimi... more In this article, a real-coded genetic algorithm (GA) is proposed capable of simultaneously optimizing the structure of a system (number of inputs, membership functions and rules) and tuning the parameters that define the fuzzy system. A multideme GA system is used in which various fuzzy systems with different numbers of input variables and with different structures are jointly optimized. Communication

Perspectives in Plant Ecology, Evolution and Systematics, 2014

ABSTRACT Cuscuta includes ca. 200 species of functionally holoparasitic plants grouped in four su... more ABSTRACT Cuscuta includes ca. 200 species of functionally holoparasitic plants grouped in four subgenera: Monogynella, Cuscuta, Pachystigma, and Grammica. Multicellular structures with stomata in Cuscuta are represented by extrafloral nectaries (ENs), reported from the stems of one Monogynella species, and stomatiferous protuberances (SPs), which are non-secretory. These latter structures had been noted on the stems of three Grammica species more than a century ago but entirely forgotten until recently when similar, non-secretory SPs were reported on the flowers of several new Grammica species. Here we study for the first time: 1) the extent of occurrence, diversity and evolution of secretory (ENs) and non-secretory (SPs) multicellular structures in Cuscuta, and 2) the function of SPs. We undertook a character evolution study of ENs and SPs on the stems and flowers of 136 Cuscuta taxa, and examined the structure/ultrastructure of SPs. ENs are inferred as primitive and characterize subg. Monogynella. SPs are derived in the remaining subgenera; they are ubiquitous on the flowers of Cuscuta and Pachystigma, but absent on their stems. Subgenus Grammica species develop two functional types of stems during their life cycle: vegetative, exploratory stems with very low stomatal densities (and no SPs), and reproductive, haustorial stems with numerous SPs. Moreover, 24 species from nine clades of subg. Grammica have evolved morphologically diverse floral SPs with systematic significance. To preliminarily ascertain SP function, we determined in the field the water uptake of Tithonia tubiformis plants parasitized or not by Cuscuta costaricensis, a species with both stem and floral SPs, and the stomatal conductance of dodder stems and flowers, as well as host leaves. Water uptake of parasitized hosts was significantly higher compared to non-parasitized plants, even after host leaves were removed, both during the day and night. The increased water uptake of parasitized hosts and stomatal conductance values suggest a transpiration role for the SPs, which is also confirmed by their lacunar structure. Grammica species with floral SPs grow in arid areas or characterised by a pronounced dry season during flowering/fruiting, which suggests that SPs may have evolved to stimulate the host water uptake during these phenophases.

The inventory of the vascular flora in the area of comunidad indígena de Nuevo San Juan Parangari... more The inventory of the vascular flora in the area of comunidad indígena de Nuevo San Juan Parangaricutiro produced the following results: 108 families with 307 genera, 716 species and 16 infraespecific taxa. From this total 52 species belong to pteridophytes, 16 to gymnosperms, 120 to monocotyledons and 544 to dicotyledons. The best represented families, in terms of species number are:

In this paper, an overview of the main topics presented in the special session of bioinformatics ... more In this paper, an overview of the main topics presented in the special session of bioinformatics and biomedical engineering is presented. Bioinformatics consists of two subfields: the development of computational tools and databases, and the application of these tools and databases in generating biological knowledge to better understand living systems, being the main subject genomics and proteomics. Another knowledge scope close to the previous one are the problems related to medicine and biomedical engineering in which it is needed the participation of computer technologies and intelligent systems. The evolution of both disciplines, analyzing the number of publications presented in the bibliography during the last twenty years is presented.

Lecture Notes in Computer Science, 2004

This work explains a new method for blind separation of a linear mixture of sources, based on geo... more This work explains a new method for blind separation of a linear mixture of sources, based on geometrical considerations concerning the observation space. This new method is applied to a mixture of several sources and it obtains the estimated coefficients of the unknown mixture matrix A and separates the unknown sources. In this work, the principles of the new method and a description of the algorithm are shown.

Phytotaxa, 2014

ABSTRACT A new species, Echeveria marianae (Crassulaceae) is described from Sierra del Tigre, Val... more ABSTRACT A new species, Echeveria marianae (Crassulaceae) is described from Sierra del Tigre, Valle de Juárez, State of Jalisco, Mexico. The species belongs to ser. Gibbiflorae due to of its acaulescent or short caulescent rosette habit, paniculiform inflorescence, conical-urceolate corolla, and tricolpate pollen grains. Within ser. Gibbiflorae it shares morphological affinities with E. novogaliciana and E. dactylifera from which it differs in the shape, color and margin of leaves, corolla size and color, stamen length, nectaries morphology, and its geographical distribution.

The European Symposium on Artificial Neural Networks, 1998

Starches of different species of tubers dioscoreas (D. remotiflora and D. sparsiflora) in the reg... more Starches of different species of tubers dioscoreas (D. remotiflora and D. sparsiflora) in the region Cienega Chapala was isolated and some physical and chemical properties evaluated. The yield of starch range from 22.10-35.79% dry weight, this range higher than those reported for D. esculenta and D. alata (12.2-18.0%) respectively. There results showed variations in the content of fat, acid hydrolysis,

Systematic Botany, 2013

Cuscuta tinctoria clade, the second largest infrageneric group of subgenus Grammica, includes 14 ... more Cuscuta tinctoria clade, the second largest infrageneric group of subgenus Grammica, includes 14 species that are centered in Mexico and adjacent regions, but also two species that are found in Australia, presumably as a result of long-distance dispersal. Flowers, pollen, and stigmas are among the largest in Cuscuta, with plants being xenogamous or facultatively xenogamous. In this clade, the convergent evolution of morphological traits, especially those associated with the calyx and gynoecium/capsule, has obscured the identity of some species and has hindered previous efforts to determine their limits. Basic morphology, scanning electron microscopy and sequence data from the nuclear internal transcribed spacer (ITS) and the plastid trnL-F region were used to reconstruct the phylogeny, gain a better understanding of the evolutionary history, and determine species boundaries. Overall, species were grouped in five subclades. Based on their morphological and molecular similarity, C. tinctoria, C. aurea, and C. floribunda are best treated as a single species, with the latter two taxa being retained as varieties of the former. Our results also show that in their currently accepted delimitation, C. rugosiceps and C. tinctoria are polyphyletic, the former including one new species, C. volcanica, and the latter two new species, C. timida and C. tolteca. In addition, three other new species are described: C. iguanella and C. insolita, both with multicellular protuberances on the calyx and/or corolla lobes, and C. montana, with broader than long calyx lobes. A taxonomic treatment that includes an identification key, descriptions, geographical distribution, ecological data, and illustrations for all taxa is provided.

Southwestern Entomologist, 2012

Proceedings of SPIE, 1996

Telemedicina is a Spanish project that covers teleradiology and radiosurgery areas. This project ... more Telemedicina is a Spanish project that covers teleradiology and radiosurgery areas. This project is under the frame of the Spanish Broadband National Plan (PLANBA). The final technical tests are being ended over Ethernet and ATM and it is planned to get their first clinical results on February-96. Two pilots will be installed: one in Madrid linking two sites through a

IEEE Transactions on Information Technology in Biomedicine, 2002

In this paper, we present the development of a remote server that provides a user-friendly access... more In this paper, we present the development of a remote server that provides a user-friendly access to advanced electrocardiographic (ECG) signal processing techniques. The prototype supplies telemedicine facilities to doctors for clinical indexes remote computation to support diagnosis through the Internet. The user-friendly interface is based on the selection of the desired ECG signal processing tools on a Web browser window. The centralized structure of the system permits unique and user-independent update and management of the software and, therefore, is especially suitable for remote or rural regions to have access to the new ECG information techniques.

IEEE Transactions on Information Technology in Biomedicine, 2000

Background: A plethora of digital electrocardiogram (ECG) formats have been proposed and implemen... more Background: A plethora of digital electrocardiogram (ECG) formats have been proposed and implemented. This heterogeneity hinders the design and development of interoperable systems and entails critical integration issues for the Health Care Information Systems.