Influence of mitochondrial deficiency on expression of microtubule-associated proteins in primary cultured hippocampal neurons of neonatal rats     

ZHANG La  AN Wen-li  LI Li  XUE Bin  BAN Li-qin  LI Xiao-ming  XU Yan-lin  LIU Shu-sen 《园艺学报》2001,17(12):1224-1228

AIM: In order to study the relationship between mitochondrial deficiency and Alzheimer's disease(AD), we used sodium azide, a specific inhibitor of cytochrome C oxidase (COX), to develop a cell model of mitochondrial complex IV deficiency and investigated the impairment of microtubules and microtubule-associated proteins. METHODS: Primary cultured hippocampal neurons of hewborn rats were exposed to sodium azidethen cell viability was measured by MTT method; cell morphology, immunofluorecence-stained cellular microtubules and microtubule-associated proteins were observed by confocal microscopy. RESULTS: Primary cultured hippocampal neurons were exposed to 8-128 mmol/L sodium azide for 3-24 h, MTT absorbance decreased dose-and time-dependently. Exposed to 64 mmol/L sodium azide for 6 h, the processes of cells retracted, synapses disappeared, axons were shortened under contrast microscope. Meanwhile, microtubles were disassembled and became disorderly, the expression of microtubule-associated proteins were also reduced especially in the processes observed by confocal microscopy. CONCLUSION: Sodium azide inhibits the assembly and polymerization of tubulin in microtubules which may be reduced by low expression of microtubule-associated proteins in nerve cells. The damage of axons induced by microtubule collapse further blocks the intercellular signal transduction and intracellular material transportation which are important causes in cell death.  相似文献   

ROLE OF THE NA+/K+-DEPENDENT ATP-ASE IN THE RESISTANCE OF BOAR SPERMATOZOA TO OSMOTIC CHANGES     

F.I. Caiza de La Cueva  T. Rigau  J.E. Rodriguez-Gil 《Reproduction in domestic animals》1995,31(1):267-268

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Bilateral congenital lateral patellar luxation in a foal.          下载免费PDF全文

N A La Faunce  D J Lerner    T R O''''Brien 《The Canadian veterinary journal. La revue veterinaire canadienne》1971,12(5):119-120

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Problems and Programs in the Application of the Sterility Principle for the Control of Ceratitis capitata Wied.     

L.E. La  Chance 《EPPO Bulletin》1972,2(6):55-62

In spite of the good results obtained in the control of Ceratitis under field conditions on the Italian islands of Capri and Procida, in Nicaragua and in the Spanish Murcia area, several problems connected with the sterile male technique still have to be solved. Mass rearing of the insects must be improved. Perhaps, total sterility of the males is not required and the necessary dose of irradiation must be studied in relation to its effect on their competitiveness in the field. In checking the efficacy of field operations the recapture of marked individuals will have to be supplemented or gradually replaced by the time-consuming assessment of egg-hatching and fruit-damage. Studies of the influence of environmental factors on population densities must be intensified.  相似文献   

A longitudinal study of sows and boars raised by smallholder farmers in the Philippines     

Lañada EB  Lee JA  More SJ  Cotiw-an BS  Taveros AA 《Preventive veterinary medicine》2005,70(1-2):95-113

We conducted a longitudinal study to obtain baseline information about the health and productivity of sows and boars raised by smallholder-pig raisers in the Philippines, and test constraints and opportunities to smallholder-sow production that had been identified previously in a cross-sectional study [More, S.J., Lee, J.-A.L.M., La?ada, E.B., Taveros, A.A., Cotiw-an, B.S., 1999. Weight-for-age of growing pigs raised by smallholder farmers in the Philippines. Prev. Vet. Med. 41, 151-169]. Over 12-18 months, we collected data during monthly on-farm visits about 213 sows raised in 119 herds at 2 sites and 32 boars in 31 herds at 1 site. Sow reproductive performance was low and boars were used only infrequently (an average of 0.9 services/month). Using repeated-measure analyses, we identified sow nutrition and piglet care (such as provision of creep feed and unrestricted access to the sow) as important husbandry issues associated with increased sow productivity.  相似文献   

A longitudinal study of unweaned piglets raised by smallholder farmers in the Philippines     

More SJ  Lee JA  Lañada EB  Taveros AA  Cotiw-an BS 《Preventive veterinary medicine》2005,70(1-2):115-131

We conducted a longitudinal study to obtain detailed baseline information about the health and productivity of unweaned piglets raised by smallholder pig raisers in the Philippines, and to identify constraints and opportunities to smallholder-piglet production. At two sites in the Philippines, we collected data about 242 litters from 173 sows in 102 herds during on-farm visits over 12-18 months. Preweaning mortality at the northern and southern sites was 17 and 9%, respectively. Of the piglet deaths at the northern site, 49% occurred within 24h of birth. Pig raisers used few of the recognised interventions known to reduce neonatal piglet mortality, although >50% of litters were given iron injections at the northern site and kept in a farrowing pen with a barrier at the southern site. Creep feeding was more common at the northern site but the nutritive value of the feeds given to piglets was low. We used repeated-measures and time-to-event analyses. Our results suggest that targeted extension (addressing, in particular, management issues relating to neonatal piglets) can contribute to increased productivity of unweaned piglets.  相似文献   

Ocular manifestations of systemic disease in cats     

La Croix NC 《Clinical Techniques in Small Animal Practice》2005,20(2):121-128

Systemic feline diseases (parasitic, bacterial, fungal, viral, neoplastic, metabolic, vascular, and immune-mediated) are often associated with ocular symptoms. An ocular examination is an important diagnostic tool and should be part of any physical examination. Conversely, cats afflicted with systemic disease require periodic ocular examinations for prognostic information and to prevent vision threatening complications. Typical feline systemic diseases encountered by the practicing clinician are presented with their commonly associated ocular signs.  相似文献   

Evaluation of the infectivity of Trichinella papuae and Trichinella zimbabwensis for equatorial freshwater fishes     

Pozio E  Rosa GL 《Veterinary parasitology》2005,132(1-2):113-114

The discovery of Trichinella species infecting poikilotherm vertebrates has opened new possibilities in the epidemiology of this parasite group. The aim of the present work was to investigate the infectivity of the two non-encapsulated species of Trichinella infecting both mammals and reptiles, Trichinella papuae and Trichinella zimbabwensis, for equatorial freshwater carnivore fishes. To this end, two species of piranhas, four Serrasalmus nattereri and four Serrasalmus rhombeus, were each inoculated per os with the two species of Trichinella larvae. Six days post infection (p.i.), one fish of each species inoculated with one of the two species of Trichinella was sacrificed. The intestines and celomatic cavities were searched for worms using dissection microscopy, and the presence of muscle larvae was evaluated by artificial digestion. The other 4 inoculated fish were sacrificed 60 days p.i. and similarly searched for the presence of worms. No larva or adult worms were detected in any organ or tissue at 6 or 60 days p.i. The lack of infectivity of T. papuae and T. zimbabwensis for fish suggests that the entozoic habitat of this animal does not represent a suitable environment for these two Trichinella species. More importantly, these data indicate that freshwater fishes, one of the food resources for crocodiles, caimans and alligators, are unlikely to play a role in the epidemiology of the known species of the genus Trichinella.  相似文献   

Failure to detect transmission of Escherichia coli O157:H7 from orally dosed nannies to sucking kids at foot     

La Ragione RM  Ahmed NM  Best A  Clifford D  Weyer U  Woodward MJ 《The Veterinary record》2005,157(21):659-661

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Bartonella bovis in cattle in Africa     

Raoult D  La Scola B  Kelly PJ  Davoust B  Gomez J 《Veterinary microbiology》2005,105(2):155-156

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