A formula for polynomials with Hermitian matrix argument

AbstractWe construct and study orthogonal bases of generalized polynomials on the space of Hermitian matrices. They are obtained by the Gram–Schmidt orthogonalization process from the Schur polynomials. A Berezin–Karpelevich type formula is given for these multivariate polynomials. The normalization of the orthogonal polynomials of Hermitian matrix argument and expansions in such polynomials are investigated

Techno-economic demand projections and scenarios for the Bolivian energy system

Increasing energy access in emerging economies has played an important role to maintain or achieve desirable social and economic development targets. As a consequence, the growing energy requirements need policy instruments to ensure energy supply for future generations. The literature reports many studies with different approaches to model and test policy measures in the energy sector, however few energy-related studies for Bolivia are available. This paper addresses this knowledge gap, representing the first national level energy demand model and projections for Bolivia. The model use demographic, economic, technology and policy trends with a pragmatic model structure that combines bottom-up and top-down modelling. The scenario analysis has a particular focus on alternatives for energy savings, energy mix diversification and air quality. Three scenarios were analysed: Energy Savings, Fuel Substitution and the aggregate effects in a Combined scenario. The reference scenario results show the overall energy consumption grows 134% in 2035 compared to 2012 with an annual average growth of 3.8%. The final energy demand in the energy savings scenario is 8.5% lower than the Reference scenario, 1.5% lower in the fuel substitution scenario and 9.4% lower in the combined Scenario. The aggregate impact of both energy savings and fuel substitution measures leads to potential avoided emissions of 25.84 million Tons of CO2 equivalent in the model horizon 2012-2035

Congenital fiber-type disproportion myopathy: a case study

Congenital fiber-type disproportion myopathy causes impaired muscle maturation or development. It is characterized by moderate to severe hypotonia and generalized muscle weakness at birth or during the first year of life, especially in the lower extremities. It is inherited as an autosomal recessive, dominant and X-linked. It is diagnosed by clinical data confirmation, generalized hypotonia and a muscle biopsy in which muscle fibers type I are smaller in caliber, 12% smaller than those of type II and type I fibers are more common than type II. Treatment is multidisciplinary. The following describes the case of a patient who was born in the ‘‘Dr. José Eleuterio González’’ University Hospital in Monterrey, N.L, who presented clinical and muscle biopsy compatible with this myopathy

Spectrum of hemifacial microsomia in a pre-term newborn: case presentation and literature review

The spectrum of hemifacial microsomia, or facio-auriculo-vertebral spectrum, is a complex of craniofacial and vertebral anomalies. Axis malformation is microtia, more often on the right side of 3:2. It may be associated with mandibular hypoplasia and vertebral malformations. It is more frequent in males and in twin pregnancies. Clinical case: Newborn male, preterm, of 29.5 weeks gestational age, twin product, second twin pregnancy, dichorionic and diamniotic, born by cesarean section, which presented hemifacial microsomia, microtia of the left Tanzer 3 and the right auricle of low implantation with a backward rotation, left appendices and macrostomia. A thoracoabdominal X-ray found hemivertebrae in the cervical and dorsal area, which discussed genetic performing diagnosis of the hemifacial microsomia spectrum. An ear TAC is done, the bone atresia of the left ear meeting at the level of the left ear without evidence of tympanic membranes and with a dysplastic oscicular chain attached to the lateral wall of the attic. Discharged at 78 days of chronological age with 6 days of age, corrected with the consultation of neonatal high-risk follow-up. Conclusion: Facial asymmetry must be widely evaluated in patients with microtia, including deliberate search of renal, cardiac and spinal-level conditions, in order to diagnose pathologies such as the spectrum of hemifacial microsomia early

Sensitivity of histological chorioaminionitis and premature rupture of membranes for neonatal sepsis and its risk factors

Set the sensitivity of the histopathological diagnosis of chorioamnionitis (CAMH) for early diagnosis of neonatal sepsis and the relationship between histological chorioamnionitis and premature rupture of membranes and neonatal sepsis. Materials and methods: Prospective, observational study and diagnostic test performed in the Neonatology Service of the ‘‘Dr. José Eleuterio González’’ University Hospital. Epidemiological variables were collected from mothers and newborns. The relationship between histological chorioamnionitis with premature rupture of membranes and early neonatal sepsis was established. Results: We recorded 3694 births. Of these, 122 patients were studied as potentially infected, of whom 37 patients were excluded (2 by transfer to another hospital and 35 by not finding a histopathological study of the placenta). The study included 85 newborns. Of these, 43 (50.5%) developed clinical and laboratory data of early neonatal sepsis, the rest (n = 42, 49.5%) were healthy newborns. The sensitivity of histological chorioamnionitis with premature rupture of membranes (PRM) of more than 24 h was 81% for neonatal sepsis and 51% without. The risk factors for neonatal sepsis were: Mother with infection (p < 0.001), weight <1500 g (<0.001), gestational age <28 weeks (<0.05), APGAR score <6 in 5 min (p < 0.05). Conclusions: Placental chorioamnionitis with premature rupture of membranes > 24 h has an 81% sensitivity for neonatal sepsis. A newborn with histological chorioamnionitis has a 51% sensitivity for neonatal sepsis

Efficacy and safety of ultrasound-guided internal jugular vein catheterization in low birth weight newborn

Central venous catheterization is not the first choice of vascular access in neonates. Success depends on the size of the vessel and the skill of the health professional performing the procedure. The internal jugular vein provides a predictable path for central venous cannulation, although it is more difficult to cannulate infants than adults and even more difficult in smaller newborns. METHODS: We conducted a prospective study in 100 newborns, in which a 4 Fr ultrasound-guided central venous catheter was placed in the right internal jugular vein (RIJV). The study population was low birth weight (LBW) newborns <2500g, very low birth weight (VLBW) newborns <1500g and extremely low birth weight (ELBW) newborns <1000g. RESULTS: Background:There were 53% female patients, mean gestational age was 31weeks, mean weight 1352g and the CVC was placed at a mean of 12days of extrauterine life. Birth weight distribution was 39% LBW; 33% VLBW and 28% ELBW. A mean of two (1-8) attempts were necessary with a procedure duration of 16.8 (10-40) minutes. Success of RIJV catheterization was 94%. One attempt was necessary in 50% and up to 5 attempts in 95.7%. Success by weight was VLBW, 97.2%; ELBW, 92.9%; LBW, 91.7%. A venous hematoma occurred in 5% of cases. CONCLUSIONS: Ultrasound-guided RIJV cannulation with real-time visualization to gain access to the central venous circulation in low birth weight newborns is effective and safe

Environmental Awareness of the Young in a Rural Community in the Sierra Tarahumara, Chihuahua, Mexico

With the aim at exploring the environmental awareness of the young sector in a predominantly indigenous community, fifty structured street interviews were applied to young individuals, aged 14 to 21, attending schools at Turuachi, a distant undeveloped rural community in the Sierra Tarahumara, in the State of Chihuahua, Northern Mexico. The data were analyzed by the software SPSS® (Statistical Package for Social Sciences). Most of the interviewees showed a good knowledge of basic ecology concepts. However, their perception of environmental problems appeared to be more influenced by everyday experiences. Despite forest being a major natural resource in the area, the group studied viewed cropping as the main economic activity. The main environmental problem was garbage pollution followed by deforestation and drought. The Chi2 test showed that women had a stronger perception than men about the garbage issue (p&lt;0.057) and a clear disposition (p&lt;0.001) to participate in municipal cleaning campaigns. Nearly all the participants were willing to engage in activities to preserve environmental quality; community action and specific workshops were selected as viable organization alternatives. Key words: environmental education, community participation, environmental problems

Vascular assessment of the right internal jugular vein in low birth weight newborns

Objective: To determine the dimensions and depth of the right internal jugular vein (RIJV) in low birth weight newborns by ultrasound and assess the differences in weight and determine the relationship of the vein with the carotid artery. Method: We performed a vascular assessment of the RIJV in 100 low birth weight newborns. The subjects were divided into three groups, low birth weight (LBW) newborns, 52500 g; very low birth weight (VLBW) newborns, 51500 g; and extremely low birth weight (ELBW) newborns 51000 g. Results: Of the newborns, 39% had LBW, 33% had VLBW, and 28% had ELBW. The medians were gestational age 31 weeks, weight 1300 g, anteroposterior diameter of the RIJV 2.2 mm, and the distance from the skin–RIJV 3.6 mm. In LBW newborns, the median anteroposterior diameter of RIJV was 2.7 mm; in LBW newborns 2.2; in ELBW newborns 1.9 (p50.001); the median distance from skin to RIJV for LBW newborns was 4.1mm; for VLBW newborns, 3.6 and for ELBW newborns 2.9 (p50.01); differences that were statistically significant. Conclusions: In low birth weight newborns, the diameter and depth of the RIJV is directly proportional to the weight of the subjects studied

Spondylothoracic dysostosis, Jarcho Levin syndrome: case report

Dysostosis spondylothoracic, or Jarcho Levin syndrome, is characterized by a short neck and thorax, a protruding abdomen, abnormal vertebral segmentation and fusion posterior costal resulting in thoracic restriction or respiratory failure and scoliosis. The prevalence is estimated at 1 in 12,000 live births for the people of Puerto Rico and 1 per 200,000 for the rest of the world. It is inherited in an autosomal recessive manner and the only related gene is MESP2. Clinical case: Newborn male, who during the first hour of life develops perioral cyanosis, thoracoabdominal dissociation and polipnea, requiring endotracheal intubation and mechanical ventilation for respiratory impairment, finding thoracoabdominal costovertebral abnormalities with an x-ray, and a conditioning restrictive pattern like a crab. During the physical examination, we found horizontal eyelid openings, right atrial appendage, straight nasal bridge, short thorax and asymmetry and hypertrichosis, predominantly in the back. A diagnosis of dysostosis spondylothoracic is confirmed, and the patient was discharged at 7 days of age, with follow up neonatal consultation at high risk