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Ortiz, Alejandra,Ortiz, Rita,Soto, Evelyn,Hartmann, Jonathan,Manzur, Alejandro,Marconi, Marcelo The Korean Society for Reproductive Medicine 2016 Clinical and Experimental Reproductive Medicine Vol.43 No.2
Objective: The goal of this study was to compare the semen parameters of two successive samples obtained within an interval of less than 60 minutes from patients planning to undergo intrauterine insemination (IUI) whose first samples exhibited low semen quality. Methods: Thirty-two consecutive patients were enrolled in the study. On the day of IUI, the semen analysis of the samples initially presented by all patients met at least two of the following criteria: sperm concentration $<5{\times}10^6/mL$, total sperm count $<10{\times}10^6$, progressive sperm motility (a+b) in the native sample <30%, and total motile sperm count (TMSC) $<4{\times}10^6$. A successive semen sample was obtained no more than 60 minutes after the first sample. Results: Compared to the first sample, the second exhibited significantly (p<0.05) improved sperm concentration, TMSC, progressive motility, and vitality. Regarding TMSC, the most critical parameter on the day of IUI, 23 patients (71.8%) improved it, while nine (28.2%) displayed poorer outcomes. Conclusion: In defined cases, requesting a second successive ejaculate on the day of insemination may result in a high percentage of cases in an improvement of the quality of the sample.
Ortiz-Chura, Abimael,Pari-Puma, Ruth Milagro,Huanca, Francisco Halley Rodriguez,Ceron-Cucchi, Maria Esperanza,Aranibar, Marcelino Jorge Aranibar The Korean Society of Fisheries and Aquatic Scienc 2018 Fisheries and Aquatic Sciences Vol.21 No.11
Trout production is a growing activity in recent years but requires new alternative sources of feed to be sustainable over time. The objective of this research was to determine the apparent digestibility coefficient (ADC) of dry matter (DM), organic matter (OM), crude protein (CP) and digestible energy (DE) of $ka{\tilde{n}}iwa$ (Chenopodium pallidicaule Aellen), kiwicha (Amaranthus caudatus L), quinoa (Chenopodium quinoa Willd), beans (Phaseolus vulgaris L.), sacha inchi, (Plukenetia volubilis L) and jumbo squid (Dosidicus gigas) meal in juvenile rainbow trout. The experimental diets were composed of a 70% basal diet and 30% of any raw materials. The ADC was determined by the indirect method using insoluble ash as a non-digestible marker. Jumbo squid, sacha inchi and quinoa showed the highest values of ADC (%) of DM (84.5, 73.5 and 69.7), OM (89.1, 78.4 and 72.9), CP (93.2, 98.0 and 90.3), and DE (4.57, 4.15 and 2.95 Mcal/kg DM), respectively. The ADC values for $ka{\tilde{n}}iwa$, kiwicha and bean were significantly lower. In conclusion, quinoa meal and jumbo squid meal have an acceptable digestibility but sacha inchi meal is a potential alternative for rainbow trout feeding in the future.
Ortiz, Michael,Cho, Sung,Niklas, Jens,Kim, Seonah,Poluektov, Oleg G.,Zhang, Wei,Rumbles, Garry,Park, Jaehong American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.12
<P>Ultrafast photoinduced electron transfer (PIET) dynamics of a C-70-encapsulated bisporphyrin covalent organic polyhedron hybrid (C-70@COP-5) is studied in a nonpolar toluene medium with fluorescence and transient absorption spectroscopies. This structurally rigid donor (D)-acceptor (A) molecular hybrid offers a new platform featuring conformationally predetermined cofacial D-A orientation with a fixed edge-to-edge separation, R-EE (2.8 angstrom), without the aid of covalent bonds. Sub-picosecond PIET (tau(ET) <= 0.4 ps) and very slow charge recombination (tau(CR) approximate to 600 ps) dynamics are observed. The origin of these dynamics is discussed in terms of enhanced D-A coupling (V = 675 cm(-1)) and extremely small reorganization energy (lambda approximate to 0.18 eV), induced by the intrinsic structural rigidity of the C-70@COP-5 complex.</P>
Analysis of thermal and damage effects over structural modal parameters
Ortiz Morales, Fabricio A.,Cury, Alexandre A. Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.1
Structural modal parameters i.e. natural frequencies, damping ratios and mode shapes are dynamic features obtained either by measuring the vibration responses of a structure or by means of finite elements models. Over the past two decades, modal parameters have been used to detect damage in structures by observing its variations over time. However, such variations can also be caused by environmental factors such as humidity, wind and, more importantly, temperature. In so doing, the use of modal parameters as damage indicators can be seriously compromised if these effects are not properly tackled. Many researchers around the world have found numerous methods to mitigate the influence of such environmental factors from modal parameters and many advanced damage indicators have been developed and proposed to improve the reliability of structural health monitoring. In this paper, several vibration tests are performed on a simply supported steel beam subjected to different damage scenarios and temperature conditions, aiming to describe the variation in modal parameters due to temperature changes. Moreover, four statistical methodologies are proposed to identify damage. Results show a slightly linear decrease in the modal parameters due to temperature increase, although it is not possible to establish an empirical equation to describe this tendency.
Numerical and experimental studies of a building with roller seismic isolation bearings
Ortiz, Nelson A.,Magluta, Carlos,Roitman, Ney Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.3
This study presents the validation of a numerical model developed for dynamic analysis of buildings with roller seismic isolation bearings. Experimental methods allowed validation of the motion equations of a physical model of a building with and without roller bearings under base excitation. The results are presented in terms of modal parameters, frequency response functions (FRFs) and acceleration response. The agreement between numerical and experimental results proves the accuracy of the developed numerical model. Finally, the performance of the constructed seismic protection system is assessed through a parametric study.
Ortiz Marco,Herrera Gerardo 한국국제경제학회 2022 International Economic Journal Vol.36 No.3
The choice of an exchange rate regime is crucial in small open economies (SOEs) with a dollarized financial sector. While the traditional Mundell–Fleming model supports a floating exchange rate, evidence shows that central banks frequently intervene in exchange markets. One of the reasons for these interventions is the consequences of large depreciations that could trigger negative balancesheet effects. This paper extends the literature about the optimal monetary policy in SOEs, by considering a heterogeneous hedge across tradable and non-tradable sectors. Our findings support a ‘leaning against the wind’ policy as an optimal response to negative external shocks. This result is present even if only one sector of the economy faces credit constraints. We show that the vulnerability of the economy to large negative external shocks depends not only on the overall leverage, but also on the distribution of foreign currency debt across economic sectors.
Ortiz, Carlos S.,Richards, Casey,Terry, Ashlee,Parra, Joselyn,Shim, Won-Bo The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.3
Maize is the dominant cereal crop produced in the US. One of the main fungal pathogens of maize is Fusarium verticillioides, the causative agent of ear and stalk rots. Significantly, the fungus produces a group of mycotoxins - fumonisins - on infested kernels, which have been linked to various illnesses in humans and animals. Nonetheless, durable resistance against F. verticillioides in maize is not currently available. In Texas, over 2.1 million acres of maize are vulnerable to fumonisin contamination, but understanding of the distribution of toxigenic F. verticillioides in maize-producing areas is currently lacking. Our goal was to investigate the genetic variability of F. verticillioides in Texas with an emphasis on fumonisin trait and geographical distribution. A total of 164 F. verticillioides cultures were isolated from 65 maize-producing counties. DNA from each isolate was extracted and analyzed by PCR for the presence of FUM1- a key fumonisin biosynthesis gene - and mating type genes. Results showed that all isolates are in fact F. verticillioides capable of producing fumonisins with a 1:1 mating-type gene ratio in the population. To further study the genetic diversity of the population, isolates were analyzed using RAPD fingerprinting. Polymorphic markers were identified and the analysis showed no clear correlation between the RAPD profile of the isolates and their corresponding geographical origin. Our data suggest the toxigenic F. verticillioides population in Texas is widely distributed wherever maize is grown. We also hypothesize that the population is fluid, with active movement and genetic recombination occurring in the field.
Volatility of methylglyoxal cloud SOA formed through OH radical oxidation and droplet evaporation
Ortiz-Montalvo, D.L.,Schwier, A.N.,Lim, Y.B.,McNeill, V.F.,Turpin, B.J. Pergamon Press ; Elsevier [distribution] 2016 Atmospheric environment Vol.130 No.-
<P>The volatility of secondary organic aerosol (SOA) formed through cloud processing (aqueous hydroxyl radical (OH) oxidation and droplet evaporation) of methylglyoxal (MGly) was studied. Effective vapor pressure and effective enthalpy of vaporization (Delta H-vap,H-eff) were determined using 1) droplets containing MGly and its oxidation products, 2) a Vibrating Orifice Aerosol Generator (VOAG) system, and 3) Temperature Programmed Desorption Aerosol-Chemical Ionization Mass Spectrometry (TPD Aerosol-CIMS). Simulated in-cloud MGly oxidation (for 10-30 min) produces an organic mixture of higher and lower volatility components with an overall effective vapor pressure of (4 +/- 7) x 10(-7) atm at pH 3. The effective vapor pressure decreases by a factor of 2 with addition of ammonium hydroxide (pH 7). The fraction of organic material remaining in the particle-phase after drying was smaller than for similar experiments with glycolaldehyde and glyoxal SOA. The Delta H-vap,H-eff of pyruvic acid and oxalic acid + methylglyoxal in the mixture (from TPD Aerosol-CIMS) were smaller than the theoretical enthalpies of the pure compounds and smaller than that estimated for the entire precursor/product mix after droplet evaporation. After 10 (even neutralized) will volatilize during droplet evaporation; neutralization and at least 80 min of oxidation at 10(-12) M (OH)-O-center dot (or >12 h at 10(-14) M) is needed before low volatility ammonium oxalate exceeds pyruvate. (C) 2015 Elsevier Ltd. All rights reserved.</P>