Ultrafiltration of potato process water—influence of processing variables     

Gun Eriksson  Björn Sivik 《Potato Research》1976,19(3):279-287

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Levels and distribution of allozyme and RAPD variation in populations of Elymus fibrosus (Schrenk) Tzvel. (Poaceae)   总被引：5，自引：0，他引：5  

Oscar Díaz  Gen-Lou Sun  Björn Salomon  Roland von Bothmer 《Genetic Resources and Crop Evolution》2000,47(1):11-24

To study the magnitude and nature of genetic variation in E. fibrosus, the levels and distribution of allozyme and RAPD variations were investigated in populations collected from Finland and Russia. The results obtained from the allozyme and RAPD studies were compared to each other in 10 of the populations. The allozyme analysis showed that 6 of 12 presumed loci (50%) were polymorphic within the species, while the mean number of polymorphic loci within populations was 4.8%. The mean number of allele per locus for the species was 1.5 and 1.05 across the populations. Genetic diversity at the species level was low (H _es = 0.025), and the mean population genetic diversity was even lower (H _ep = 0.007). Both these values were much lower than the average for other Elymus and self-fertilising species. The largest proportion of the total allozyme diversity was found among, rather than within the populations (G _ST = 0.70). The allozyme genetic distances between the populations did not reflect geographic distances. Cluster and principal coordinates analyses revealed the same allozyme relationship patterns among the populations. A comparison of allozyme and RAPD variation in 10 of the populations showed differences in the amount of genetic variation. The RAPD analysis revealed higher levels of variation (A _p = 1.19, P _p = 20.3 and H _ep = 0.09) than the allozyme one) A _p = 1.06, P _p = 5.8 and H _ep = 0.008). For both markers, the largest proportion of the total gene diversity was found among the populations studied (G _st = 0.63 for RAPDs and G _st = 0.65 for allozyme). In contrast to the allozyme analysis, the RAPD based genetic distances did reflect geographic distances. The cluster and principal coordinates analyses showed different grouping of populations for each data set. There was a positive, but not significant, correlation (r = 0.41) between the genetic distance matrices resulting from these markers. Regional comparison revealed that the Finnish populations had a higher diversity than the Russian ones. Generally, this study indicates that E. fibrosus contains low genetic variation in its populations. The results are discussed in the context of conservation of the species.  相似文献   

Starch availability in vitro and in vivo after flaking,steam-cooking and popping of wheat     

J. Holm  I. Björck  N.-G. Asp  L.-B. Sjöberg  I. Lundquist 《Journal of Cereal Science》1985,3(3):193-206

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Pulmonary gas exchange correlated to clinical signs and lung pathology in horses with chronic bronchiolitis   总被引：1，自引：0，他引：1  

G Nyman  R Lindberg  D Weckner  M Bj?rk  C Kvart  S G Persson  H Gustafsson  G Hedenstierna 《Equine veterinary journal》1991,23(4):253-260

Eight horses (mean weight 438 kg) with chronic obstructive pulmonary disease (COPD) were studied for clinical signs, ventilation/perfusion relationships (VA/Q) and lung morphology. Four horses were killed and necropsied after the study. In horses with COPD, minute ventilation was almost twice as high as normal, whereas PaO2 was significantly decreased. Cardiac output was normal, but pulmonary artery pressure and pulmonary vascular resistance were significantly increased. The VA/Q distribution was abnormal with an increased scatter of VA/Q ratios. However, shunt (VA/Q = 0) was increased in one horse only. Ventilation of dead space and high VA/Q regions (VA/Q greater than 10) were increased markedly and comprised 74 per cent of minute ventilation. On lung biopsy, all horses showed chronic bronchiolitis with epithelial hyperplasia and metaplasia. Diffuse acinar hyperinflation also was evident at necropsy. There was a significant inverse correlation between the respiratory rate and the fractional ventilation of normal VA/Q regions. Also, there was a significant agreement between the extent of bronchiolar epithelial hyperplasia in necropsy specimens of lungs and the degree of ventilation of high VA/Q regions and dead space. The findings suggest that hyperinflation of the lung due to obstructed airways may be the common denominator of increased ventilation of high VA/Q regions and dead space ventilation and of elevated pulmonary artery pressure in horses with COPD from chronic bronchiolitis.  相似文献   

Detection of early osteoarthritis in the centrodistal joints of Icelandic horses: Evaluation of radiography and low‐field magnetic resonance imaging          下载免费PDF全文

C. J. Ley  S. Björnsdóttir  S. Ekman  A. Boyde  K. Hansson 《Equine veterinary journal》2016,48(1):57-64

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Effect of induced chronic atrial fibrillation on exercise performance in Standardbred trotters          下载免费PDF全文

Rikke Buhl  Helena Carstensen  Eva Zander Hesselkilde  Bjørg Zinkernagel Klein  Karen Margrethe Hougaard  Kirsten Bomberg Ravn  Ameli Victoria Loft‐Andersen  Merle Friederike Fenner  Christian Pipper  Thomas Jespersen 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2018,32(4):1410-1419

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Otolith size differences during early life of dwarf and cannibal Arctic char (Salvelinus alpinus)          下载免费PDF全文

Bjørn Florø‐Larsen  Anders G. Finstad  Ole K. Berg  Per H. Olsen 《Ecology of Freshwater Fish》2016,25(2):203-210

In Arctic and alpine lakes, Arctic char [Salvelinus alpinus (L.)] often form two distinct morphs: invertebrate feeders (‘dwarfs’) and piscivores (‘giant or cannibals’). Here, we test for early life history growth variation in dimorphic Arctic char as a proximate explanation for the observed life history variation between the two forms. Char were sampled in 11 alpine and Arctic Norwegian lakes. Dwarfs (defined as sexually mature char less than 15 cm long; N = 304) had a mean total length of 105 mm, whereas the typical cannibal (body length above 20 cm; N = 153) was 388 mm long. A positive correlation between egg size and otolith hatching ring were ascertained in a separate hatching experiment with brown trout (Salmo trutta) and it is assumed that this relationship also is valid for Arctic char, and otolith size was used as a proxy for length. Otolith hatching ring from Arctic char cannibals was larger (mean ± SD; 187 ± 24 μm) than those from dwarfs (mean ± SD; 164 ± 23 μm). There were only minor size differences between dwarfs and cannibals during the next three years, after which dwarfs usually matured. Two mutually nonexclusive, proximate explanations for the differentiation into separate morphs (dwarfs and cannibals) are therefore maternal effects and/or genetic based differentiation. The high catchability of large piscivorous char and low production in alpine and Arctic lake ecosystems may make these stocks particularly vulnerable to overexploitation.  相似文献   

欧亚大陆地上森林凋落物的研究   总被引：17，自引：0，他引：17  

刘春江  杨玉盛  马祥庆 《林业研究》2003,14(1):27-34

根据一个包括471个林分的森林凋落物数据库,本文对欧亚大陆森林生态系统的凋落物产量进行了估计。结果表明:欧亚大陆森林生态系统凋落物产量为每年6.53 Pg (1 Pg = 1015g),其中二分之一发生在热带和亚热带森林,三分之一发生在寒带森林,剩余的发生在温带森林。因此,在欧亚大陆森林生态系统中,森林凋落物每年从森林植被转移大约2.94 Pg 碳到土壤亚系统。表3参18。 关键词:碳流动;欧亚大陆森林;森林凋落物  相似文献   

Über die Natur der Mykorrhizabildung unter besonderer Berücksichtigung der Waldbäume und die Anwendung in der forstlichen Praxis     

E. BjöRkman 《European Journal of Forest Research》1956,75(9-10):265-286

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Separation of selenium, zinc, and copper compounds in bovine whey using size exclusion chromatography linked to inductively coupled plasma mass spectrometry     

Hoac T  Lundh T  Purup S  Onning G  Sejrsen K  Akesson B 《Journal of agricultural and food chemistry》2007,55(10):4237-4243

To study the role of trace elements for the quality and nutritional value of bovine milk, the distribution of selenium, zinc, and copper in whey was investigated using a method linking size exclusion chromatography to inductively coupled plasma mass spectrometry (SEC-ICP-MS). Three major peaks were detected for selenium, two peaks for zinc, and five peaks for copper. More than 65% of the selenium was found in protein fractions, mainly in fractions coinciding with the major whey proteins beta-lactoglobulin and alpha-lactalbumin. All zinc was associated with low molecular weight compounds (<5 kDa) and one of these compounds was probably citrate. More than 60% of the copper eluted in protein fractions and two of the five major peaks probably contained metallothionein and citrate. This method was used to compare milk and whey produced by organic and conventional feeding procedures. The selenium content in whey and desalted milk produced using organic regimens was significantly lower than that in conventional samples. Moreover, the proportion of selenium in protein fractions of organic whey was significantly smaller than that in conventional whey, but the distributions of zinc and copper did not differ. This study showed that with the SEC-ICP-MS technique the distribution profiles of several trace elements in whey could be studied in the same run and that the selenium profile differed in whey produced by organic and conventional procedures.  相似文献