Mississippi Valley-type (MVT) Zn–Pb deposits generally form in both orogenic forelands and thrust belts, but the tectonic and structural controls on ore formation in the latter tectonic setting ...remain poorly understood. This study examines MVT deposits in the late Mesozoic–Cenozoic Tethyan and Cordilleran orogenic thrust belts that have ages determined mainly by paleomagnetic methods or that are well constrained by other geological relationships. Some deposits predated regional thrusting but most deposits formed during regional transpression or extension after early stages of thrusting during convergence. Extensional faults rather than compressional (reverse or thrust) faults control the distribution of ore zones at the deposit or district scale. Post-thrusting MVT mineralization within thrust belts occurs as a result of synorogenic stress transition from compression to transpression/extension. This stress change appears to favor the generation of local extensional faults due to reactivation of pre-existing structures, simple shearing-related tension or dilation, or other mechanisms such as gravitational spreading of weak crust, lower crustal flow, and removal of lithosphere. In comparison, ore-controlling extensional faults in forelands are generated by means of the flexure of the foreland plate during orogenic convergence. Exploration for MVT ores in orogenic thrust belts should focus on extensional zones and extensional faults at district and deposit scales.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
U ovom se radu razmatraju morfološke značajke, vijabilnost polena i zametanje ploda u pet kultivara rajčice (Roma, Tropimech, Tima, Tedino i UC-82-B) uzgajane u Nigeriji. Sjeme je uzgojeno u ...Botaničkom vrtu Sveučilišta Ilorin u Nigeriji. Sakupljeni su i analizirani podaci o morfologiji rasta i stvaranju ploda te utvrđena vijabilnost polena u odnosu na zametanje ploda.Rezultati pokazuju značajne varijacije i korelacije između visine biljke i karakterikstike listova. Međutim,vegetativni rast nije bio u izravnoj vezi s postotkom stvaranja cvjetova i zametanja plodova, ali vijabilnost polena bila je izravno proporcionalna sa zametanjem plodova kod istraživanih kultivara rajčice.Smanjenje vijabilnosti polena pratio je manji broj zametenih plodova.Na broj plodova i veličinu mogu djelovati biotički i abiotički čimbenici, iako se otkrilo da je postotak vijabilnog polena u majčinskoj stanici polena djelovao na zametanje ploda. Dok zrna polena na terenu mogu podlijegati mnogobrojnom stresu, vijabilnost polena u kontroliranom okruženju može se razlikovati od vijabilnosti polena na otvorenom. Međutim,vijabilnost polena u izravnoj je vezi sa zametanjem ploda u rajčice i može se promatrati kao vitalna značajka za poboljšanje rajčice u uzgojnom programu.
U središnjem dijelu Južne Hrvatske, u priobalnom području Jadranskog mora, sa središtem u gradu Splitu, određivali smo koncentraciju peluda u zraku tijekom 1994. godine i izradili peludni kalendar. ...Tijekom cijele godine u zraku je dominirala visoka koncentracija peluda crkvine (Parietaria officinalis Parietaria officinalis), do 20 % od travnja do lipnja. Peludi Pistacia lentiscus, Olea europea, Pinus halepensis, Juniperus oxycedrus, Acacia baileyana, Artemisia vulgaris, Ambrosia elatior i Cistus monspliensis nađeni su u nižim koncentracijama i u kraćem razdoblju. Kožni test urađen je u 3500 osoba tijekom 1994./95. godine, koje su imale alergijske smetnje dišnih organa, a upotrijebljeni su standardni komercijalno pripremljeni inhalacijski alergeni i posebno za tu svrhu izrađeni alergeni peludi biljaka mediteranskog podneblja. Oko 30 % pacijenata bilo je preosjetljivo na standardne inhalacijske alergene peluda (mješavina alergena peluda trava, mješavina alergena peluda stabala Parietaria officinalis, Pitospora tobira). Kod 45 % pacijenata nađena je preosjetljivost na više od jednog alergena, 15 % pacijenata nije reagiralo ni na jedan od standardnih alergena. Dodatna testiranja novoproizvedenim alergenima biljaka ( Pistacia lentiscus, Olea europea, Pinus Pistacia lentiscus, Olea europea, Pinus halepensis, Acacia baileyana, Cistus monspeliensis, Artemisia vulgaris i Ambrosia elatior) otkrila su nam elatior preosjetljivost kod velikog broja pacijenata, ali i nakon toga 36 % pacijenata nije reagiralo ni na jedan od testiranih alergena. Ova informacija potvrđuje potrebu za daljnjim istraživanjima ove vrste, za dodatnom identifikacijom, izolacijom i karakterizacijom alergena peluda u području obale Jadranskog mora.
WORCESTER Alexander Polena Thomas, formerly of Cape Cod and Florida died Wed., Aug. 3. His wife, Mary (Rekas) Thomas predeceased him. He leaves his daughter, Nina Thomas of Haines City, FL and his ...brothers, Steven, and Michael Thomas of Worcester and Christopher Thomas of Taunton. His brothers, James, Anthony and Peter Thomas and a sister, Helen Nauchy predeceased him.
Her husband, John D. Polena, died in 1982. She leaves a daughter, Joan E. Perkins of Auburn; a son, Donald Polena of Webster; five grandchildren, including John M. Perkins of Charlton and Richard K.
Michael J. Polena, of 77 Chase Ave., Apt. 1L, Webster, was charged Tuesday with driving under the influence of alcohol, third offense; failure to stop for police; and driving with a suspended ...license. He pleaded not guilty in Dudley District Court yesterday and Judge Neil G. Snider released him on $5,000 personal recognizance. He must remain drug- and alcohol-free, wear an electronic monitoring device with an alcohol breath test, and attend Alcoholics Anonymous meetings. A pretrial hearing is scheduled for July 18. The patrolman's report said that he activated his motorcycle's lights and siren and pulled partially in front of the SUV. Mr. Polena allegedly swerved his car around the patrolman and continued on for about a quarter-mile, until he reached his apartment complex's parking lot.
Michael J. Polena, of 77 Chase Ave., Apt. 1L, Webster, was charged Tuesday with driving under the influence of alcohol, third offense; failure to stop for police; and driving with a suspended ...license. He pleaded not guilty in Dudley District Court yesterday and Judge Neil G. Snider released him on $5,000 personal recognizance. He must remain drug- and alcohol-free, wear an electronic monitoring device with an alcohol breath test, and attend Alcoholics Anonymous meetings. A pretrial hearing is scheduled for July 18. The patrolman's report said that he activated his motorcycle's lights and siren and pulled partially in front of the SUV. Mr. Polena allegedly swerved his car around the patrolman and continued on for about a quarter-mile, until he reached his apartment complex's parking lot.
Her husband, Lester L. Jordan Sr., died in 1976. She leaves a son, Lester L. Jordan Jr. of CLINTON; two daughters, Sharon Jordan- Bahosh of Lancaster and Mary M. Jordan of Clinton; a sister, Anna ...Polena of Webster; three grandchildren; nephews and nieces. She was born in Mystic, Conn., daughter of Stanley and Anna (Tanajewski) Krysiak, and was raised in Oxford.
A nivel mundial, los aeroalérgenos más frecuentes causantes de enfermedades alérgicas son los granos de polen anemófilos. Estos han sido capaces de desencadenar crisis que han reflejado una elevada ...morbilidad. En Cuba los estudios de sensibilización a granos de polen han sido escasos. Con el objetivo de determinar la sensibilización a granos de polen en pacientes alérgicos y su relación con la presencia de enfermedades alérgicas, se realizó un estudio observacional descriptivo de corte transversal, no aleatorizado, de marzo a junio del 2019. La muestra se constituyó de 33 pacientes con asma, rinitis, rinoconjuntivitis alérgica, dermatitis atópica y conjuntivitis alérgica. A todos los pacientes se les realizó historia clínica alergológica y prueba cutánea por punción con extractos alergénicos de: Helianthus annus, Cosmos bipinnatus, Cynodon dactylon, Quercus sp, Eucaliptus sp. Se aplicaron las frecuencias absolutas, porcientos, desviación estándar, promedio, edad media y test de Spearman para su análisis. La edad media de la muestra fue de 36,9 años, con predominio de mujeres. Más del 50% de los pacientes presentaron sensibilización a granos de polen; y de ellos, el 24,24% resultaron polisensibilizados. El mayor porcentaje de sensibilización fue a Cynodon dactylon. La rinitis alérgica fue la enfermedad que prevaleció en la población estudiada.
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En América del Sur se reportan más de 20 especies de abejorros, nueve de ellas en la Cordillera Oriental de los Andes colombianos. Se las conoce como polinizadores importantes, pero su distribución ...fue disminuyendo debido al creciente cambio en el uso del suelo; esto ha causado el empobrecimiento de los ecosistemas andinos. Identificar y proteger los recursos florales que usan las abejas silvestres resulta clave en el manejo de áreas silvestres para mitigar el impacto de las actividades humanas en áreas muy intervenidas (e.g., ciudades o cultivos). El análisis de polen es una herramienta clave para conservar los recursos florales que utilizan las abejas, pero depende de contar con catálogos polínicos que permitan identificaciones taxonómicas adecuadas. El objetivo de este estudio fue desarrollar un catálogo de polen de las plantas que utilizan tres de los abejorros andinos más comunes, Bombus rubicundus, B. hortulanus y B. pauloensis. Los muestreos se realizaron en seis localidades de la sabana de Bogotá, cubriendo un gradiente de altitud entre 2600 y 3500 m s. n. m. Se prepararon muestras florales de todas las localidades mediante acetólisis, y luego se las analizó. Se digitalizó un catálogo de referencia a partir del polen extraído del cuerpo de obreras de cada especie de abejorro. Los granos de polen se describieron según su tamaño y morfología. La similitud de los recursos utilizados por las diferentes especies de abejorros se comparó mediante el índice de similitud y distancia de Jaccard. Se aislaron, identificaron y describieron granos de polen de 99 plantas, de las cuales Taraxacum officinale, Vallea stipularis, Senna multiglandulosa, Trifolium pratense y Trifolium repens fueron las fuentes de polen compartidas por todas las especies. La especie más generalista y que utilizó más plantas exóticas fue B. pauloensis. Se proporciona un catálogo ilustrado de polen con todos los recursos utilizados por las abejas.
