Coahuila Research Articles

Whole genome sequencing of a Domibacillus strain from the Cuatro Ciénegas basin that tends to act as an altruist.

Domibacillus sp. 8LH is a whitish bacterium isolated from the pools of the Cuatro Cienegas Basin (CCB) in the state of Coahuila and belongs to the Bacillaceae family. It grows in circular colonies of about 6 mm in diameter and is capable of forming biofilms. This strain was identified because, in previous experiments in our laboratory, it presented altruistic interactions when co-cultured with bacteria of the genus Bacillus that participate in the nitrogen cycle. This altruistic behavior confers to this Domibacillus strain a potential use for the construction of bacterial consortia with diverse biotechnological applications.

Clinical and epidemiological characterization of infections in pediatric hemato-oncology patients with febrile neutropenia in the North of Mexico

Abstract Background Neutropenic fever is the most common complication in patients undergoing chemotherapy, where the choice of empirical antibiotic treatment should be based on the probable focus of infection, the predominant causative microorganisms, and the sensitivity of those organisms to antibiotics, which varies between each hospital and region. Over time, the spectrum of isolated microorganisms in different clinical syndromes of patients presenting during their infectious episode has changed. Our objective is to describe the prevalence of infectious etiology in pediatric patients with neutropenic fever, as well as the clinical characteristics of patients with documented infection. Methods The study design is ambispective, observational, and descriptive of a cohort type. Patients between 0 and 18 years old from the pediatric department of the “Dr. José E. González” University Hospital will be included from May 2019 to June 2023, with hematological-oncological disease during their febrile neutropenia infectious process with a complete medical record. Results A total of 326 episodes of febrile neutropenia were included, of which 15% had microbiological isolation (49 patients). The etiological classification during the events was as follows: bacteria 81%, viruses 14%, and fungi 4%. Five different infection sites were identified. Among these, bacteremia were the most frequent site of infection (10%), followed by gastrointestinal infections (2.4%), respiratory infections (1.5%), skin and soft tissue infections (1.2%), and lastly, urinary tract infections (1%). A total of 45 microorganisms were isolated from different infection sites. Among these, gram-negative bacteria (28 isolates, 62%) were more common and outnumbered gram-positive bacteria (14 isolates, 31%). Among gram-negatives, Escherichia coli (42%) was the most common isolate, followed by Pseudomonas aeruginosa (17%), and Klebsiella pneumoniae (14%). Among gram-positives, Streptococcus mitis (28%), Coagulase-negative Staphylococcus (21%), and Rothia mucilaginosa (14%) were identified. Conclusion Febrile neutropenia at the Hospital Universitario primarily affects 6-year-old males with ALL. The microbiological characterization suggests the intentional search for gram-negative bacteremia, allowing us to direct timely and targeted antibiotic therapy to influence clinical prognosis. It is worthwhile to continue the research line that allows us to identify susceptibility and resistance profiles to address these patients more effectively.

Description of a new species of Chrysonotomyia Ashmead from Houston, Texas, USA (Hymenoptera, Chalcidoidea, Eulophidae).

A new species of the genus Chrysonotomyia Ashmead, Chrysonotomyiasusbelli sp. nov., is described from the Rice University campus in Houston, Texas, USA. The species is a parasitoid emerging from Neuroterusnr.bussae galls in leaves of the southern live oak (Quercusvirginiana). This represents the 6th species described from North America north of Mexico and the first in the world known to parasitize cynipid gall wasps. This discovery hints at an entire undiscovered niche between Chrysonotomyia parasitoids, cynipid gall wasps, and oaks in the Nearctic, which is a global biodiversity hotspot for oaks and cynipids. This new species description is complemented by mtDNA-COI-barcode data and information on the natural history of this species. We record host association, phenology, and report a leaf-scanning behavior performed by females, presumably to search for host galls. Modifications to the key of New World members of the genus (Hansson 2004) are included to integrate this new species.

Development and Testing of a Low-Concentrating Photovoltaic-Thermal Collector

Testing and certification of solar technologies are crucial to characterize and guarantee their performance under different operating conditions. These procedures are even more relevant for novel solar technologies such as low-concentrating photovoltaic-thermal (LCPV-T) collectors. This paper presents the development and early-stage testing of a LCPV-T collector in a newly established testing laboratory based on a comprehensive review of international standards. The testing facility was designed, built, and commissioned in the north of Mexico, and it is the first of its kind in Latin America. It allows us to evaluate the thermal and electrical performance of LCPV-T collectors with a maximum area of 6 m2 and electrical peak power of 3 kWe. The operational temperature of the LCPV-T collectors can reach up to 120°C and can be characterized under steady-state and quasi-dynamic testing conditions.

First Report of the Sanderling (Calidris alba) in Cuatro Ciénegas Valley, Coahuila, Mexico

The Sanderling (Calidris alba) is the most widely distributed shorebird that winters on both coasts of America, with records of vagrant individuals in the interior of the continent. On 14 September 2022, we observed and photographed two juvenile Sanderlings at a small pool adjacent to the Río Mezquites in the Cuatro Ciénegas protected area, Coahuila, Mexico. This sighting represents the first record of this species in this RAMSAR site, and increases the known inland distribution in northeastern Mexico, as well as the first documented for the state of Coahuila.

BLOOD LEAD CONCENTRATION ANALYSIS BETWEEN REHABILITATION FACILITY AND PERI-URBAN ENVIRONMENT VIRGINIA OPOSSUMS (DIDELPHIS VIRGINIANA) OF ILLINOIS.

The Virginia opossum (Didelphis virginiana) is the only marsupial in North America with a natural range north of Mexico. Its range is widespread throughout the United States, including Illinois. Virginia opossums are opportunistic omnivores that will eat a variety of fruits, grains, insects, and even carrion. They are a ground-foraging species, with frequent soil contact allowing for potential exposure to heavy metal contaminants in terrestrial environments. They are also opportunists that thrive in human-altered ecosystems, including peri-urban environments. Lead is a naturally occurring element and highly toxic metal that is abundant in the soil, primarily due to anthropogenic factors such as fossil fuel use, paint, industrial production waste, and battery recycling. Furthermore, carrion and offal piles containing lead bullet fragments remaining from hunting result in environmental contamination of this heavy metal. Few studies exist on lead exposure in the Virginia opossum. This pilot study evaluates the blood lead burden of 16 free-ranging Virginia opossums presented to a wildlife rehabilitation facility, compared with 16 wild-caught Virginia opossums trapped in grassland, maintained forest, or mixed ecotones. In other species, lead toxicosis has been associated with cognitive dysfunction that may increase the likelihood of trauma or injury in a free-ranging setting. In addition, a high incidence of Virginia opossums presenting for wildlife rehabilitation do so as result of human-animal conflict. Therefore, it was anticipated that individuals presenting for wildlife rehabilitation would have significantly higher blood lead concentrations than their free-roaming counterparts. In this study, every Virginia opossum had measurable blood lead concentrations and the average blood lead concentration of the rehabilitated group was 2.7 times higher than that measured in wild-caught Virginia opossums. These results suggest that Virginia opossums are exposed and susceptible to lead toxicosis due to their diet and foraging behaviors, making them more prone to subsequent injury and presentation to wildlife rehabilitation centers.

The species of Pteromalus Swederus in America north of Mexico with a 4:4 mandibular formula, and description of a potential biocontrol agent of the introduced pest Anthonomus rubi (Herbst) (Coleoptera: Curculionidae)

The species of Pteromalus Swederus in America north of Mexico with a 4:4 mandibular formula, and description of a potential biocontrol agent of the introduced pest Anthonomus rubi (Herbst) (Coleoptera: Curculionidae)

Archaeoastronomy and Landscape Archaeology at Cahokia

The Mississippian-era site of Cahokia was the largest Native American city north of Mexico. Archaeologists have long speculated about possible astronomic alignments and spatial relationships in the layout of its 100+ earthen mounds. In this paper LiDAR imagery, historic documents, ethnohistoric and archaeologic data are used to assess the site relative to astronomic and landscape alignments. New findings show how Monks, Rattlesnake, Powell and other mounds are aligned to the Sun, Moon, and Milky Way. Additionally, these alignments intersect prominent bluffs to the east and southeast that appear to have been used as horizon markers. 

In Search of the St. Louis Mound Group: Archaeoastronomic and Landscape Archaeology Implications

The Cahokia Mound Group in Illinois, USA, is acknowledged as the largest Native American city north of Mexico. It flourished during the Mississippian Period. Cahokia, however, was only one of three complexes in the immediate area. Located across the Mississippi River from Cahokia, the St. Louis Mound Group was part of the larger complex.The St. Louis Mound Group featured at least 25 earthen mounds including the so-called Big Mound that contained dozens of human burials.In the 1800s the St. Louis Mound Group was leveled to allow for urban expansion. Few records are in existence documenting the location or other details concerning the group. As a result, an important part of prehistory seems lost.  In this paper the likely location for the St. Louis Mound Group is identified using survey plats from the 1850s, early lithographs and other data. Findings are assessed for astronomical alignments and landscape relationships, with possible cosmological implications noted.

Mancera-Valencia, F.J. & Mayagoitia, E.A. (2023) Cultural Heritage and Education. Universidad Pedagógica del Estado de Chihuahua Editorial

Although the topics of the research articles that are compiled in this book focus on a wide range of themes, such as the connection between school and museums, the use of radio as a schooling device for indigenous population or the unique architecture of Mennonite schools in the north of Mexico; they all share the same objective: to foster a debate regarding the relevance of heritage education. Some of the texts are research articles, others document intervention experiences in different educational contexts, both formal and informal. Most of them narrate practices that were implemented in Mexican territory (specifically, the states of Chihuahua, Nuevo León, Mexico City and Baja California), except for one project that was conducted in Spain. The articles cover topics like the implications of educational heritage, its purpose, didactic orientations, devices, and places. The book coordinators, Federico Mancera-Valencia and Eva Mayagoitia, prestigious Mexican researchers, argue that patrimonial education is in its gestational state, and, since it is a research field that is constantly evolving, it has its own tensions and contradictions. The book is composed of 12 chapters, created by authors of different backgrounds and fields: professors, researchers, educators, an archeologist, an anthropologist and a geographer, all of them with extensive experience in educational heritage. These articles are organized in four sections: a) Educational heritage: tensions and debates, b) Academic Cultural Heritage, c) Cultural Heritage of Indigenous Education and d) Museums, libraries and cultural heritage management.

Enhancing epidemiological knowledge of Botryosphaeriaceae in Mexican vineyards

Grapevine cultivation in Mexico is important, especially in the states of Baja California and Coahuila, which are the main wine production regions in the country. Grapevine trunk diseases (GTDs) impact productivity and cause substantial economic losses, with Botryosphaeria dieback being one of the most destructive. This disease is caused by fungi in the Botryosphaeriaceae, including species of Botryosphaeria, Diplodia, Lasiodiplodia, and Neofusicoccum. To date, Lasiodiplodia spp. are the primary Botryosphaeriaceae fungi reported in Mexico. The present study aimed to enhance the epidemiological knowledge of Botryosphaeriaceae in Mexican vineyards. Samples from grapevine plants exhibiting disease symptoms were collected from the states of Baja California and Coahuila. Of a total of 37 Botryosphaeriaceae isolates, six species were identified: Neofusicoccum parvum, N. australe, N. vitifusiforme, Botryosphaeria dothidea, Diplodia corticola, and D. seriata. Neofusicoccum parvum isolates were the most virulent, but were less virulent than previously reported Lasiodiplodia spp. The optimum growth temperatures for N. parvum and B. dothidea were from 28 to 30°C, but 25°C for D. seriata, N. vitifusiforme, and N. australe isolates. Only D. seriata isolates recovered growth when transferred to room temperature after exposure to 37°C or 40°C. This report is the first identification of B. dothidea and N. parvum as causative agents of Botryosphaeria dieback in the vine-growing regions of Mexico.

Hallazgo de Pleurotus cystidiosus (Agaricales, Pleurotaceae) en el norte de México

Background and Aims: Some species of Pleurotus form anamorphs that produce coremia and arthrospores, which are classified in the subgenus Coremiopleurotus and are morphologically very similar. In Mexico, seven species of the genus are known; however, only P. smithii, described from Mexico City, is known to form coremia. Recent collections of Pleurotus from Chihuahua, Mexico, showed distinct characteristics from the known species for the country, whose morphological and molecular characterization allowed us to identify P. cystidiosus in Mexico. The objective of this work was to document the presence of P. cystidiosus in Mexico and provide a detailed description of the specimens found in the country. Methods: The material was collected in Ciudad Juárez, Chihuahua, Mexico. Specimens were characterized macro- and microscopically through in situ photographs, polyfocal, and light microscopy. Morphological identification was performed using specialized literature. DNA extraction was carried out following a 3% CTAB protocol. The ITS region was amplified using the primer pairs ITS5/ITS4. Phylogenetic analyses were conducted using Maximum Likelihood and Bayesian Inference. Key results: Pleurotus cystidiosus, a species previously unreported in Mexico, is morphologically and taxonomically described, confirmed with barcode sequences. The species is distinguished by the presence of abundant clavate to pyriform pleurocystidia and subglobose cheilocystidia in the teleomorph, as well as the formation of coremia with a white stipe, black head, and segments of arthrospores up to 17-25 × 5-7.5 µm in the anamorph. Conclusions: The presence of P. cystidiosus in the north of Mexico is confirmed. With this study, the number of known Pleurotus species for Mexico increases to eight.

Lower Valanginian ammonite biostratigraphy of the Cañón de la Vaca section, Taraises Formation, Coahuila state, northern Mexico

The present work carries out a biostratigraphic analysis of the Valanginian ammonite record from the Cañón de la Vaca section in the Sierra de Parras, Coahuila, Mexico. The collection of ammonites exhibits an abundance of specimens, representing a biodiverse range of taxa, and numerous occurrences throughout the biostratigraphic section. This record in the Taraises Formation allowed a solid identification and diagnosis of the ‘Thurmanniceras’ pertransiens, Neocomites neocomiensiformis and Karakaschiceras inostranzewi zones, along with the Neocomites premolicus, Neocomites neocomiensiformis, Busnardoites campylotoxus, Karakaschiceras inostranzewi and Neocomites platycostatus subzones. These biostratigraphic units corresponds to the lower Valanginian of the Standard Mediterranean Ammonite Zonation. Among the collected ammonites, numerous specimens of significant biostratigraphic importance remain scarcely known or lack a proper taxonomic identification. This situation has been already observed in other sections, such as Peña del Águila, Zacatecas, Mexico, and in the Betic Cordillera, southeast Spain. Fortunately, these unknown taxa can be compared with other sections in Mexico and with lower Valanginian ammonites from Spain, facilitating a more comprehensive biostratigraphic analysis. The present biostratigraphic analysis is expected to contribute to an increased understanding of lower Valanginian strata, thereby enabling future taxonomic and biostratigraphic research on the lower Valanginian in Mexico and globally.

G. R. Pohl & S. R. Nanz Annotated taxonomic checklist of the Lepidoptera of North America, North of Mexico

G. R. Pohl & S. R. Nanz Annotated taxonomic checklist of the Lepidoptera of North America, North of Mexico

Remains of a sea turtle from the Austin Formation (Upper Cretaceous, Campanian), Coahuila, Mexico

New remains of a sea turtle from the San Carlos quarry (Upper Cretaceous, Campanian), Austin Formation in the north of Coahuila state, Mexico, are reported. San Carlos quarry is composed of limestones and its Campanian age is based on the presence of the ammonites Scaphites hippocrepis and Delawarella delawarensis. In addition to the presence of turtles, this quarry also contained ammonites, bivalves, crabs, sea urchins, bony fish remains, and shark teeth. The study material is housed at Museo Paleontológico de Múzquiz. The preserved fossil elements correspond to postcranial elements, which present morphological characteristics that allowed them to be identified as belonging to a small-sized turtle related to Protostegidae. These new sea turtle remains expand the knowledge and distribution of Protostegidae along the Western Interior Seaway, where large and medium-sized sea turtles were distributed.

«В Коауиле провозглашается коммунизм». Эпизод из истории Мексиканской революции (1912 г.)

The article deals with a little-known and little-studied episode from the history of the Mexican Revolution of 1910-1917, the proclamation of communism by anarchist guerrillas in the state of Coahuila in 1912. A brief but vivid history of the guerrillas, organized by the Magonists from the Mexican Lib-eral Party (PLM) at one of the key moments of the revolution, is considered in the context of the general role of the anar-chist movement at various stages of the revolution in Mexico, of evolution of its ideology, strategy and tactics. An attempt has been made to assess the significance of the events under consideration for the development of the anarchist movement in the world. PLM, led by brothers Riсardo and Enrique Flo-res Magon, was in 1906-1908 the first political force that launched a rebel movement against the dictatorship of Porfirio Diaz, and in 1910-1911 made a significant contribu-tion to the overthrow of the regime. However, after this, the leadership of the Mexican Liberal Party officially switched to the position of anarchism, and its supporters tried to organize a guerrilla movement with the aim of carrying out a social revolution in Mexico. Although the PLM rebel forces were crushed by superior government forces in 1912, and many of their members were killed, the proclamation of anarchist communism by a group of guerrillas on February 9, 1912 in the Mexican state of Coahuila, one of the traditional areas of influence of the Magonists, was the first act of this kind in the history of world anarchist movement and served as an example for anarchists in other countries.

Mosses of Coahuila, northern Mexico: The dryland species

The moss flora of the state of Coahuila and that in northwestern Mexico is poorly known. Recent exploration in the drylands of Coahuila have yielded findings that bring the number to about 101 species in the state moss flora where the Pottiaceae, Bryaceae, and Grimmiaceae are the families best represented. The lowland moss flora is well represented in the Chihuahuan Desert area in northern Mexico, but also in the southern United States. Species of Crossidium, Pseudocrossidium, and Syntrichia are known desiccation-tolerant mosses; Entodon concinnus and Ephemerum coherens are additions to the moss flora of Mexico.

Phylogenomic perspectives on speciation and reproductive isolation in a North American biodiversity hotspot: an example using California sages (Salvia subgenus Audibertia: Lamiaceae).

The California Floristic Province (CA-FP) is the most species-rich region of North America north of Mexico. One of several proposed hypotheses explaining the exceptional diversity of the region is that the CA-FP harbours myriad recently diverged lineages with nascent reproductive barriers. Salvia subgenus Audibertia is a conspicuous element of the CA-FP, with multiple sympatric and compatible species. Using 305 nuclear loci and both organellar genomes, we reconstruct species trees, examine genomic discordance, conduct divergence-time estimation, and analyse contemporaneous patterns of gene flow and mechanical reproductive isolation. Despite strong genomic discordance, an underlying bifurcating tree is supported. Organellar genomes capture additional introgression events not detected in the nuclear genome. Most interfertility is found within clades, indicating that reproductive barriers arise with increasing genetic divergence. Species are generally not mechanically isolated, suggesting that it is unlikely to be the primary factor leading to reproductive isolation. Rapid, recent speciation with some interspecific gene flow in conjunction with the onset of a Mediterranean-like climate is the underlying cause of extant diversity in Salvia subgenus Audibertia. Speciation has largely not been facilitated by gene flow. Its signal in the nuclear genome seems to mostly be erased by backcrossing, but organellar genomes each capture different instances of historical gene flow, probably characteristic of many CA-FP lineages. Mechanical reproductive isolation appears to be only part of a mosaic of factors limiting gene flow.

Acid Leaching of La and Ce from Ferrocarbonatite-Related REE Ores

Rare earth elements comprise a group of 17 chemically similar elements, which increases the difficulty of separating them by traditional methods. For this reason, hydrometallurgy has been the most used method. However, it is important to evaluate the efficiency of the leaching processes used because, in addition to depending on the operating parameters of the leaching, they also depend on the mineralogical composition of the sample. In the present work, the extraction of Ce and La contained in the ferrocarbonatite mineral from the north of Mexico was studied. For the leaching tests, several leaching agents were used (HCl, H2SO4, HNO3, and H3PO4 in different concentrations (0.5 [M], 1 [M], 1.5 [M]) and the temperature was modified to 20, 40, and 60 °C. A maximum recovery of 70% for Ce and La was obtained using HCl 1M in 4 h. The results of the kinetic study of the experiments showed that the best fitting model according to these kinetic models was the SCM controlled by a chemical reaction.

Study of musculoskeletal disorders risk factors and discomfort in sculptors in the north of Mexico

BACKGROUND: The sculpting craft must adopt awkward postures that lead to musculoskeletal disorders (MSDs). OBJECTIVE: This study investigated the prevalence of musculoskeletal discomfort (MD) and its associations with postural risk factors, demographics, and work characteristics among sculptors. They were determined the differences between MDs during the weeks of the study. METHODS: A longitudinal study was conducted; MD was investigated using the Cornell Musculoskeletal Discomfort Questionnaire (CMDQ). Posture was assessed using the Rapid Upper Limb Assessment method (RULA). Multivariate logistic regression (MLR) models analyzed associations with different factors. ANOVA was used to test for differences in MD prevalence. RESULTS: The analysis included 585 responses by body region. The prevalence of MD was high in the lower and upper limbs among sculptors (67.6%), with the lower back, upper arm, neck, and knees being the four most affected regions. Gender (female) (OR = 2.15), marital status (married) (OR = 1.80), health risk (obesity), the dual of a secondary job (OR = 1.94), job stress (OR = 2.10), duration of work (OR = 2.01), and difficulty keeping up with work (OR = 2.00) were significant predictors contributing to the occurrence of MD in different body regions. Only shoulder MD prevalence showed significant differences between study weeks. CONCLUSIONS: Sculptors suffer from MD. Demographic and work characteristic factors influence MD prevalence. Postural training, improved adaptation of work organization, and intervention guidance on ergonomic risks may reduce the prevalence of MD and the risk of MSDs in this population.