Cloud forest dynamics in the mexican neotropics during the last 1300 years

Abstract

In the present work, the problem of the motion of the classical particle in the Kepler-Coulomb field in three-dimensional hyperbolic space H 2 2: z 2 0 + z 2 1 - z 2 2 - z 2 3 = R 2 is solved in the framework of Hamilton-Jacobi equation. The requirements for the existence of bounded motion of particle are formulated. The equation of the trajectory of particle is obtained, and it is shown that all the finite trajectories are closed. It is also demonstrated that under the certain values (zero or negative) of the separation constant A the fall of the particle onto the center takes place. " 2013 Pleiades Publishing, Ltd.",,,,,,"10.1134/S1063778813090135",,,"http://hdl.handle.net/20.500.12104/40096","http://www.scopus.com/inward/record.url?eid=2-s2.0-84885830563&partnerID=40&md5=52f938ac91d5b20ba1a39a702f821b67",,,,,,"10",,"Physics of Atomic Nuclei",,"1273

1283",,"76",,"Scopus

WOS",,,,,,,,,,,,"Classical Kepler-Coulomb problem on SO(2, 2) hyperboloid",,"Article" "44825","123456789/35008","Olvera-Cortés, E., Laboratorio de Neurofisiología Experimental, CIBIMI, IMSS. Morelia, 58000 Mich, Mexico; López-Vázquez, M.A., Laboratorio de Psicobiología, CIBIMI, IMSS. Morelia, P.O. Box 7-70, 58000 Mich, 58261, Mexico; Beas-Zárate, C., Laboratorio de Neurobiología Celular Y Molecular, CIBO, U. de G. Guadalajara, 44340 Jal. México, Mexico; González-Burgos, I., Laboratorio de Psicobiología, CIBIMI, IMSS. Morelia, P.O. Box 7-70, 58000 Mich, 58261, Mexico",,"Olvera-Cortes, E.

Lopez-Vazquez, M.A.

Beas-Zárate, Carlos

Gonzalez-Burgos, I.",,"2005",,"The activation of glutamatergic NMDA receptors of the hippocampus is closely associated with expression of place learning. Neonatal exposure to monosodium glutamate leads to abnormal expression of NMDA receptor subunits in the hippocampus, but its effect on place learning is unknown. Place learning acquisition and retrieval were assessed in mature adult rats after subcutaneous injection of monosodium glutamate (4 mg/g body weight) in eight neonatal rat pups at postnatal days one, three, five, and seven. Eight untreated rats were used as controls. At four months of age, the rats were challenged over a period of nine days with a place learning task. The task used an acquisition-retrieval paradigm in a Morris maze. Place learning acquisition was impaired in the experimental rats, which were unable to reduce their escape latencies during the nine training days. Controls improved between the fifth and ninth days of training. Test trials showed that retrieval of spatial information was also impaired in the experimental animals. These results show that both place learning acquisition and retrieval abilities in mature rats are impaired by neonatal treatment with monosodium glutamate. These findings may be related to the abnormal expression of NMDA receptor subunits in the hippocampus. © 2005 Elsevier Inc. All rights reserved.",,,,,,"10.1016/j.pbb.2005.08.007",,,,"http://www.scopus.com/inward/record.url?eid=2-s2.0-28444444571&partnerID=40&md5=ada33d555fb0bf626cb8b7f63842c101

http://hdl.handle.net/20.500.12104/43046",,,,,,"2",,"Pharmacology Biochemistry and Behavior",,"247

251",,"82",,"Scopus

WOS",,,,,,"Hippocampus; Monosodium glutamate; Neurotoxicity; Place learning; Spatial orientation",,,,"Neonatal exposure to monosodium glutamate disrupts place learning ability in adult rats",,,,"Article", "41868","123456789/35008",,"García-García, G., Nephrology Service, Hospital Civil de Guadalajara, University of Guadalajara Health Sciences CenterGuadalajara, Jal, Mexico; Jha, V., Postgraduate Institute of Medical Education and ResearchChandigarh, India, George Institute for Global Health, IndiaNew Delhi, India, University of Oxford, United Kingdom; Kam, P.; Li, T.; Couser, W.G.; Erk, T.; Zakharova, E.; Segantini, L.; Shay, P.; Riella, M.C.; Osafo, C.; Dupuis, S.; Kernahan, C.",,"García-García, G.

Jha, V.

Kam, P.

Li, T.

Couser, W.G.

Erk, T.

Zakharova, E.

Segantini, L.

Shay, P.

Riella, M.C.

Osafo, C.

Dupuis, S.

Kernahan, C.",,"2015",,"The increased burden of CKD in disadvantaged populations is due to both global factors and population-specific issues. Low socioeconomic status and poor access to care contribute to health care disparities, and exacerbate the negative effects of genetic or biologic predisposition. Provision of appropriate renal care to these populations requires a two-pronged approach: expanding the reach of dialysis through development of low-cost alternatives that can be practiced in remote locations, and implementation and evaluation of cost-effective prevention strategies. Kidney transplantation should be promoted by expanding deceased donor transplant programs and use of inexpensive, generic immunosuppressive drugs. The message of WKD 2015 is that a concerted attack against the diseases that lead to ESRD, by increasing community outreach, better education, improved economic opportunity, and access to preventive medicine for those at highest risk, could end the unacceptable relationship between CKD and disadvantage in these communities.",,,,,,"10.5262/tndt.2015.1001.01",,,"http://hdl.handle.net/20.500.12104/40089","http://www.scopus.com/inward/record.url?eid=2-s2.0-84921842731&partnerID=40&md5=8874b7e9e822b3232b90230a1616cf05",,,,,,"1",,"Turkish Nephrology, Dialysis and Transplantation Journal",,"1

5",,"24",,"Scopus",,,,,,,,,,,,"CKD in Disadvantaged Populations",,"Review" "44826","123456789/35008","Beas-Zárate, C., Laboratorio de Neurobiología Celular y Molecular, CIBO, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico; Pérez-Vega, M.I., Laboratorio de Psicobiología, División de Neurociencias, Instituto Mexicano del Seguro Social (IMSS), A.P. 7-70, C.P. 58261, Morelia, Michoacán, Mexico; González-Burgos, I., Laboratorio de Psicobiología, División de Neurociencias, Instituto Mexicano del Seguro Social (IMSS), A.P. 7-70, C.P. 58261, Morelia, Michoacán, Mexico

Beas-Zárate, Carlos., Universidad de Guadalajara. Centro Universitario de Ciencias Biológicas y Agropecuarias",,"Beas-Zárate, Carlos

Perez-Vega, M.I.

Gonzalez-Burgos, I.",,"2002",,"Glutamatergic post-synaptic receptors are closely related to the known excitotoxic effects of high doses of L-glutamate. Several behavioral abnormalities, glial reaction, and an increase of expression of the NMDA receptor sub-units have been observed in the rat hippocampus after early monosodium glutamate exposure. Thus, a quantitative morphological study was carried out to determine the effects of early exposure to monosodium glutamate on post-synaptic structures that mediate glutamate excitatory neurotransmission in the hippocampal CA1 field. Four milligrams per gram body weight of monosodium glutamate was subcutaneously injected into neonatal Wistar rats, at 1, 3, 5, and 7 days. Cell loss and several cytoarchitectonic parameters were evaluated in pyramidal cells from the hippocampal CA1 field in the treated rats at 60 days of age. An untreated group of rats were used as controls. Cell number in the hippocampus of experimental rats was 11.5% less than that in control animals. In addition, both dendritic arborization and dendritic spine density were adversely affected, and thin and mushroom-shaped spines became proportionally more numerous, while the opposite occurred to stubby spines. These results strongly suggest the occurrence of cell death and also show some cytoarchitectural modifications in the surviving neurons. These could lead to functional alterations in the hippocampal integrative activity, due to an early cytoexcitotoxic effect of monosodium glutamate. © 2002 Elsevier Science B.V. All rights reserved.",,,,,,"10.1016/S0006-8993(02)03252-3",,,,"http://www.scopus.com/inward/record.url?eid=2-s2.0-0037131060&partnerID=40&md5=8daa136c0e60e0746460decd7f3936e2

http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=med4&AN=12376189

http://hdl.handle.net/20.500.12104/43047",,,,,,"2",,"Brain Research",,"275

281",,"952",,"Scopus

MEDLINE

WOS",,,,"Index Medicus;Animals;Animals, Newborn;Cell Count/mt [Methods];Cell Death/de [Drug Effects];Hippocampus/de [Drug Effects];Hippocampus/pa [Pathology];Male;Neurons/de [Drug Effects];Neurons/pa [Pathology];Pyramidal Cells/de [Drug Effects];Pyramidal Cells/pa [Pathology];Rats;Rats, Wistar;Sodium Glutamate/pd [Pharmacology]",,"CA1; Cell death; Dendritic remodeling; Hippocampus; Monosodium glutamate; Spine",,,,"Neonatal exposure to monosodium L-glutamate induces loss of neurons and cytoarchitectural alterations in hippocampal CA1 pyramidal neurons of adult rats",,,,"Article", "41912","123456789/35008",,"Figueroa-Rangel, B.L., Departamento de Ecología y Recursos Naturales-IMECBIO, Centro Universitario de la Costa Sur, Universidad de Guadalajara, Apartado Postal 108, Autlán de Navarro, Jalisco, C.P. 48900, Mexico; WIllis, K.J., Oxford Long-Term Ecology Laboratory, Oxford University Centre for the Environment, School of Geography, South Parks Road, Oxford OX1 3QY, United Kingdom, Department of Biology, University of Bergen, N-5007 Bergen, Norway; Olvera-Vargas, M., Departamento de Ecología y Recursos Naturales-IMECBIO, Centro Universitario de la Costa Sur, Universidad de Guadalajara, Apartado Postal 108, Autlán de Navarro, Jalisco, C.P. 48900, Mexico",,"Figueroa-Rangel, B.L.

WIllis, K.J.

Olvera-Vargas, M.",,"2010",,"Key questions for understanding the resilience and variability of Mexican Neotropical cloud forest assemblages in current and future climate change include: How have human disturbances and climate change affected the dynamics of the cloud forest assemblage? What are the predominant processes responsible for its present day composition and distribution? Are the current conservation strategies for the cloud forest in accordance with preserving its natural variability through time? In this study, the temporal dynamics of the cloud forest in west-central Mexico over the last ?1300 years were reconstructed using palaeoecological techniques. These included analyses of fossil pollen, microfossil charcoal, and sediment geochemistry. Results indicated that a cloud forest assemblage has been the predominant vegetation type in this region over the last ?1300 years. During this time, however, there have been changes in the vegetation with an apparent expansion of cloud forest from ?832 to 620 cal years bp and a decline from 1200 to 832 cal years bp. Climate change (intervals of aridity) and human disturbances through anthropogenic burning appear to have been the main factors influencing the dynamics of this cloud forest. The spatial heterogeneity reported for high-altitude forests in this region, in concert with high beta diversity, appears to be a manifestation of the high temporal variability in species composition for these forests. Greater turnover in cloud forest taxa occurred during intervals of increased humidity and is probably representative of a higher temporal competition for resources among the cloud forest taxa. The present results support the current protection scheme for cloud forests in west-central Mexico where areas are kept in exclusion zones to avoid timber extraction, grazing, and agriculture; this will maintain diversity within these forests, even if there are only a few individuals per species, and enable the forests to retain some resilience to current and future climate change. " 2009 Blackwell Publishing Ltd.