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排序方式: 共有106条查询结果,搜索用时 15 毫秒
1.
J García-Martínez JA Castro M Ramón A Latorre A Moya 《Canadian Metallurgical Quarterly》1998,149(3):1377-1382
The evolution of Drosophila subobscura mitochondrial DNA has been studied in experimental populations, founded with flies from a natural population from Esporles (Majorca, Balearic Islands, Spain). This population, like other European ones, is characterized by the presence of two very common (>96%) mitochondrial haplotypes (called I and II) and rare and endemic haplotypes that appear at very low frequencies. There is no statistical evidence of positive Darwinian selection acting on the mitochondrial DNA variants according to Tajima's neutrality test. Two experimental populations, with one replicate each, were established with flies having a heterogeneous nuclear genetic background, which was representative of the composition of the natural population. Both populations were started with the two most frequent mitochondrial haplotypes, but at different initial frequencies. After 13 to 16 generations, haplotype II reached fixation in three cages and its frequency was 0.89 by generation 25 in the fourth cage. Random drift can be rejected as the force responsible for the observed changes in haplotype frequencies. There is not only statistical evidence of a linear trend favoring a mtDNA (haploid) fitness effect, but also of a significant nonlinear deviation that could be due to a nuclear component. 相似文献
2.
Chatterjee Gaurav Latorre Laurent Mailly Frédérick Nouet Pascal Hachelef Nacim Oudea Coumar 《Microsystem Technologies》2017,23(9):3969-3978
Microsystem Technologies - Inertial measurement units (IMU) are essentially a combination of acceleration and rotation rate sensors, generating position and attitude information. For tactical and... 相似文献
3.
Stephen Buckman Mara Latorre M. Martin Bosman Neveen Nawawy Bomin Koh 《Papers in Regional Science》2019,98(2):679-699
As cities are compelled to compete for new sources of investment and revenue, arts-based economic development strategies have become the norm. The purpose of this paper is to revisit and reevaluate some of the conventional claims about the arts as an important economic development strategy by exploring a case study called “The Space at 2106 Main” in a rapidly gentrifying neighbourhood called West Tampa. The results of this study suggest that the arts are indeed assuming a greater role in economic policy under the auspices of West Tampa community redevelopment areas (CRA) and the direct actions of various arts related entrepreneurs. The results however, point to a mixed picture that raises difficult questions about the medium to long-term effects of this urban redevelopment strategy, especially on the poor and mostly minority residents of West Tampa. 相似文献
4.
Latorre AA Pradhan AK Van Kessel JA Karns JS Boor KJ Rice DH Mangione KJ Gröhn YT Schukken YH 《Journal of food protection》2011,74(8):1268-1281
The objectives of this study were to estimate the risk of illness for raw milk consumers due to Listeria monocytogenes in raw milk sold by permitted dealers, and the risk for people on farms who consume raw milk. Three scenarios were evaluated for raw milk sold by dealers: raw milk purchased directly from bulk tanks, from on-farm stores, and from retail. To assess the effect of mandatory testing of raw milk by regulatory agencies, the number of listeriosis cases per year was compared where no raw milk testing was done, only a screening test to issue a permit was conducted, and routine testing was conducted and milk was recalled if it was L. monocytogenes positive. The median number of listeriosis cases associated with consumption of raw milk from bulk tanks, farm stores, and retail for an intermediate-age population was 6.6 × 10(-7), 3.8 × 10(-5), and 5.1 × 10(-5) cases per year, respective ly. In populations with high susceptibility, the estimated median number of cases per year was 2.7 × 10(-7) (perinatal, i.e., pregnant women and their fetuses or newborns) and 1.4 × 10(-6) (elderly) for milk purchased from bulk tanks, 1.5 × 10(-5 ) (perinatal) and 7.8 × 10(-5) (elderly) for milk from farm stores, and 2.1 × 10(-5) (perinatal) and 1.0 × 10(-4) (elderly) for milk from retail. For raw milk consumed on farms, the median number of listeriosis cases was 1.4 × 10(-7) cases per year. A greater risk of listeriosis was associated with consumption of raw milk obtained from retail and farm stores as compared with milk obtained from bulk tanks. This was likely due to additional time-temperature combination steps in the retail and farm store models, which increased the chances for growth of L. monocytogenes in raw milk. A close relationship between prevalence of L. monocytogenes in raw milk and the values of disease incidence was observed. Hence, a reduction in the number of cases per year in all populations was observed when a raw milk-testing program was in place, especially when routine testing and recalling of milk was conducted. 相似文献
5.
Exercise training-induced changes in sensitivity to endothelin-1 and aortic and cerebellum lipid profile in rats 总被引:2,自引:0,他引:2
Latorre E Morán M Aragonés MD Saborido A Fernández I Delgado J Catalán RE Megías A 《Lipids》2002,37(1):43-52
The purpose of this work was to study whether exercise training induces changes in the lipid profile of rat aorta and nervous
system and in the in vitro intrinsic responsiveness of these tissues to endothelin-1 (ET-1) treatment. The exercise program performed successfully produced
the characteristic metabolic alterations of the trained state. Exercise training induced a large and significant increase
in the levels of both aortic ethanolamine plasmalogens (PlasEtn) and glucosylceramides. In contrast, a decrease of aortic
ceramide and cholesterol levels was evoked by exercise training. ET-1 increased PlasEtn content only in sedentary animals.
An exercise-induced increase in cerebellum levels of ceramides and ceramide monohexosides was found. The cerebellum ceramide
content was increased by FT-1 more noticeably in sedentary rats than in trained animals. In contrast, cerebral cortex was
observed to be largely insensitive to both exercise training and ET-1 treatment. It was concluded that exercise training (i)
induces changes in both vascular and cerebellar lipid profiles, the former being much more pronounced than the latter, and
(ii) diminishes the aortic and cerebellar sensitivity to ET-1 action. 相似文献
6.
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8.
O. Leman F. Mailly L. Latorre P. Nouet 《Analog Integrated Circuits and Signal Processing》2010,63(3):415-423
This paper presents the study of an original closed-loop conditioning approach for fully-integrated convective inertial sensors.
The method is applied to an accelerometer manufactured on a standard CMOS technology using an auto-aligned bulk etching step.
Using the thermal properties of the sensor, a first order sigma-delta modulator is built. This “electro-physical” modulator
realizes an analog-to-digital conversion of the acceleration signal. Besides, the feedback mode of operation improves the
sensor overall performance. 相似文献
9.
F Puigventós Latorre V Llodrà Ortolà M Vilanova Boltó O Delgado Sánchez M Lázaro Ferreruela J Forteza-Rey Borralleras J Serra Devecchi 《Canadian Metallurgical Quarterly》1997,109(18):702-706
INTRODUCTION: Ten years of publications (1984-1993) about drug compliance in spanish hypertensive patients are presented. MATERIAL AND METHODS: A bibliography search of Medline (EBSCO CD-ROM ver 104.1, act Jul 1995), Indice Médico Espa?ol (CSIC CD-ROM, act Oct 1993) and other sources has been made. RESULTS: 39 articles have been located and 23 investigational publications have been analysed. All the publications, but one, have evaluated the compliance by an indirect method, mainly patient selfdeclaration. The degree of patient compliance determined by interviews, questionnaires or inquiries is 55.5% (IC 95%: 52.7-58.3). The patient compliance in the publications that use methods based in pill counts is 46.4% (IC 95%: 41.6-51.2). The treatment dropout is present in the 18.5% of the patients (IC 95%: 20.5-16.5). CONCLUSIONS: The drug compliance degree in Spanish patients with hypertension is low. 相似文献
10.