Ontogenetic movements of juvenile blacktip reef sharks: evidence of dispersal and connectivity between coastal habitats and coral reefs     

A Chin  MR Heupel  CA Simpfendorfer  AJ Tobin 《水产资源保护:海洋与淡水生态系统》2013,23(3):468-474

Phosphate desorption from the surface of soil mineral particles by a phosphate-solubilizing fungus   总被引：1，自引：0，他引：1  

Nelson Walter Osorio  Mitiku Habte 《Biology and Fertility of Soils》2013,49(4):481-486

High phosphate (Pi) sorption in soils is a serious limiting factor for plant productivity and Pi fertilization efficiency, particularly in highly weathered and volcanic ash soils. In these soils, the sorbed Pi is so strongly held on the surfaces of reactive minerals that it is not available for plant root uptake. The use of phosphate-solubilizing microorganisms (PSM) capable of Pi desorption seems to be a complementary alternative in the management of these soils. The aim of this study was to evaluate the effectiveness of the soil fungus Mortierella sp., a known PSM, to desorb Pi from four soil minerals differing in their Pi sorption capacity. The fungus was effective in desorbing Pi from all tested minerals except from allophane, and its desorption depended on the production of oxalic acid. The effectiveness of the fungus to desorb Pi was ranked as montmorillonite > kaolinite > goethite > allophane. The quantity of desorbed Pi increased by increasing the amount of sorbed Pi. The Pi sorption capacity expressed as P_0.2 value (amount of P required to increase a solution P concentration up to 0.2 mg L^?1) was a good indicator of the effectiveness of Mortierella sp. to desorb Pi from soil minerals.  相似文献   

Tree planting in Tigray, Ethiopia: the importance of human disease and water microdams     

Gregory S. Amacher  Lire Ersado  William F. Hyde  Amy Osorio 《Agroforestry Systems》2004,60(3):211-225

We examine the decision to plant trees and level of tree planting for two sites, public microdam areas and household agricultural land, and two species groups in Tigray, Ethiopia. Both sites are not perfect substitutes, as they vary with respect to distance from the household and tenure security. The role of permanent pooled water irrigation microdams to tree planting is important but unknown, because water borne diseases, which may influence household income and productivity, are thought to be enhanced by the dams. We find both disease and microdams to be important predictors to tree planting. Disease seems more important in determining whether households plant at all, and less important in the level of planting for those that do plant. For example, disease increases the probability of planting both eucalyptus and other species groups on household-own land, but households suffering from malaria plant higher-cost eucalyptus trees with lower probability at both sites, while planting of other lower-cost species increases at dam sites where other villagers can monitor the trees. We also establish a connection between planting and agricultural residues, finding a strong substitution effect on own-land. Microdam access and age are also important. Households living nearer to dam sites will plant both species groups there with higher probabilities, but the decision to plant on agricultural own-land is not affected. For older dams with more developed irrigation, households are more likely to grow crops rather than plant trees on their own land, but they plant more trees at the dam sites. This revised version was published online in June 2006 with corrections to the Cover Date.  相似文献   

Retracted: Effect of Post‐Thaw Storage Time on Motility and Fertility of Cryopreserved Beluga Sturgeon (Huso huso) Sperm          下载免费PDF全文

MS Aramli  RM Nazari  MR Gharibi 《Reproduction in domestic animals》2015,50(2):349-352

The aim of this study was to test the influence of post ‐ thaw storage time on the duration of sperm motility, percentage of motile sperm, and fertilization and hatching rates of fresh sperm and sperm stored for 0, 30 and 60 min at 4°C post‐thawing. After being frozen in liquid nitrogen and then thawed, the percentage of motile sperm and duration of motility were not affected by 30 min of storage at 4°C, whereas a significant decline in these parameters was observed after 60 min of storage. Similarly, fertilization and hatching rates were significantly affected within 60 min of storage at 4°C, and the fertility of frozen‐thawed sperm was significantly lower than that of fresh sperm. We conclude that cryopreserved sperm of beluga sturgeon could be stored for 30 min without the loss of sperm quality. This described procedure for beluga sturgeon cryopreservation is reliable and efficient and therefore can be recommended for hatchery practice after scaling up this technique.  相似文献   

The Influence of Morphology,Follicle Size and Bcl‐2 and Bax Transcripts on the Developmental Competence of Bovine Oocytes     

THC De Bem  PR Adona  FF Bressan  LG Mesquita  MR Chiaratti  FV Meirelles  CLV Leal 《Reproduction in domestic animals》2014,49(4):576-583

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Tick-borne diseases of cattle in Paraguay. I. Seroepidemiological studies on anaplasmosis and babesiosis     

R. C. Payne  O. Osorio 《Tropical animal health and production》1990,22(1):53-60

Summary A serological survey was carried out in Paraguay to determine the prevalence of antibodies toAnaplasma marginale, Babesia bigemina andBabesia bovis. The results suggest that the parasites are widely distributed throughout the country with prevalence rates of 9w% forA. marginale, 79% forB. bigemina and 71% forB. bovis. Epidemiological studies on calves demonstrated that initial infection with the three blood parasites occurs in most animals within the first nine months of life. It is likely therefore that most of the country can be considered as being enzootically stable with respect to anaplasmosis and babesiosis.

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Enfermedades Transmitidas For Garrapatas En Paraguay. I. Estudios Seroepidemiologicos De Anaplasmosis Y Babesiosis

Resumen Se llevó a cabo un estudio serológico en el Paraguay, para determinar la prevalencia de anticuerpos deAnaplasma marginale, Babesia bigemina yB. bovis. Los resultados sugieren que los parásitos se encuentran ampliamente distribuidos en todo el país, con tasas de prevalencia de 92% paraA. marginale, 79% paraB. bigemina y 71% paraB. bovis.Los resultados epidemiológicos en terneros demostraron que la infección inicial con los tres parásitos sanguíneos, ocurre durante los primeros nueve meses de vida en la mayoría de ellos. Es possible entonces inferir que la mayoría del país es estable enzoóticamente con respecto a anaplasmosis y babesiosis.

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Maladies Des Bovins Transmises Par Les Tiques Au Paraguay. I. Etudes Seroepidemiologiques Sur l'Anaplasmose Et La Babesiose

Résumé Une enquête sérologique a été réalisée au Paraguay pour déterminer la fréquence des anticorps pourAnaplasma marginale, Babesia bigemina etBabesia bovis. Les résultats indiquent que les parasites sont largement répandus dans tout le pays avec des taux de prévalence de 92% pourA. marginale, 79% pourB. bigemina et 71% pourB. bovis. Les études épidémiologiques réalisées sur des veaux ont démontré que l'infection initiale avec les trois parasites sanguins se produit chez la plupart des animaux durant les neuf premiers mois de la vie. Il est donc vraisemblable que l'on peut considérer la majeure partie du pays comme enzootiquement stable pour ce qui concerne l'anaplasmose et les babésioses.

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Rhodococcus equi-associated osteomyelitis in foals     

EC FIRTH  MR ALLEY†  H HODGE 《Australian veterinary journal》1993,70(8):304-307

Two cases of Rhodococcus equl infection in foals are described, in which osteomyelitis was a feature. Because rhodococcal infection is usually low grade and chronic, and because the signs of early metaphysitis can be subtle, any articular or periarticular swelling in a foal from a farm with a history of rhodococcosis should be strongly suspected to be associated with R equl until proven otherwise.  相似文献   

Reply     

MR ALDERTON 《Australian veterinary journal》1993,70(11):429-430

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非典型猪繁殖和呼吸综合症的回顾     

袁森泉 《国外畜牧学(猪与禽)》2001,(1):39-41

研究表明,猪繁殖和呼吸综合症病毒是造成近10年来美国所谓非典型猪繁殖和呼吸综合症流行的原因。美国的养猪业尽管取得了重大进展,但仍然容易受到各种疾病的侵害,因而需要开发出能快速鉴别新感染的手段。　　现在我们称之为猪繁殖和呼吸综合症的复杂的临床症候群,首次在1989年报告于北美。自那时以来,大量调查研究得出结论认为猪繁殖和呼吸综合症病毒是这一灾难性疾病的病原因子。九十年代早期展现在美国猪兽医面前的猪繁殖和呼吸综合症临床症状是:妊娠后期广泛性繁殖失败、妊娠母猪或公猪临床症状轻微或没有其它临床症状,以及幼猪出现呼吸…  相似文献   

Sunflower mutant containing high levels of palmitic acid in high oleic background     

José M. Fernández-Martínez  Manuel Mancha  Jorge Osorio  Rafael Garcés 《Euphytica》1997,97(1):113-116

A new sunflower mutant, CAS-12, was obtained, which has both high palmitic (≈30%) and high oleic acid contents, and also a substantial amount of palmitoleic acid (≈7%). The mutant was selected after X-ray irradiation of dry seeds of the inbred line BSD-2-423, which had normal palmitic (≈3%) and high oleic (≈88%) acid levels. The increase of palmitic and palmitoleic acids occurred at the expense of the oleic acid content, which decreased to around 55% in respect to the original line. Linoleic acid content is always under 5%. Palmitic and palmitoleic acid levels were similar to those of the high palmitic mutant CAS-5 obtained in a previous programme from a low oleic line isogenic to BSD-2-423 using a similar mutagenic treatment. In that previous programme we also selected three high stearic acid mutants using chemical mutagenic treatment on the same sunflower line (RDF-1-532). We attempted to obtain mutants in other lines but were unsuccessful. The isolation of similar mutants in isogenic parental lines illustrates the importance of the genetic background in the development of specific mutants with an altered seed oil fatty acid composition. The oil of this mutant will increase the range of potential uses of sunflower oil. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献