Peritoneo-pericardial diaphragmatic hernia in a Persian cat--a congenital defect]     

B Trebel  J P Popp 《Tier?rztliche Praxis》1991,19(6):664-667

In this clinical study, a diaphragmatic peritoneo-pericardial hernia in an eight month-old Persian cat is reported. The diagnostic procedure is described, and the clinical symptoms and diagnostic possibilities are discussed.  相似文献   

Occurrence of bacterial kidney disease (BKD) of salmonids in West Germany     

C Pfeil-Putzien  R Hoffmann  W Popp  M Schauner 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1985,32(7):541-547

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Land Cover Transition in Northern Tanzania     

Issa Ouedraogo  Jennie Barron  Siza D. Tumbo  Frederic C. Kahimba 《Land Degradation \u0026amp; Development》2016,27(3):682-692

Land conversion in sub‐Saharan Africa has profound biophysical, ecological, political and social consequences for human well‐being and ecosystem services. Understanding the process of land cover changes and transitions is essential for good ecosystem management policy that would lead to improved agricultural production, human well‐being and ecosystems health. This study aimed to assess land cover transitions in a typical semi‐arid degraded agro‐ecosystems environment within the Pangani river basin in northern Tanzania. Three Landsat images spanning over 30 years were used to detect random and systematic patterns of land cover transition in a landscape dominated by crop and livestock farming. Results revealed that current land cover transition is driven by a systematic process of change dominated by the following: (i) transition from degraded land to sparse bushland (10·8%); (ii) conversion from sparse bushland to dense bushland in lowland areas (6·0%); (iii) conversion from bushland to forest (4·8%); and (iv) conversion from dense bushland to cropland in the highlands (4·5%). Agricultural lands under water harvesting technology adoption show a high degree of persistence (60–80%) between time slices. This suggests that there is a trend in land‐use change towards vegetation improvement in the catchment with a continuous increase in the adoption of water harvesting technologies for crop and livestock farming. This can be interpreted as a sign of agricultural intensification and vegetation regrowth in the catchment. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Transgenic inhibition of synaptic transmission reveals role of CA3 output in hippocampal learning     

Nakashiba T  Young JZ  McHugh TJ  Buhl DL  Tonegawa S 《Science (New York, N.Y.)》2008,319(5867):1260-1264

The hippocampus is an area of the brain involved in learning and memory. It contains parallel excitatory pathways referred to as the trisynaptic pathway (which carries information as follows: entorhinal cortex --> dentate gyrus --> CA3 --> CA1 --> entorhinal cortex) and the monosynaptic pathway (entorhinal cortex --> CA1 --> entorhinal cortex). We developed a generally applicable tetanus toxin-based method for transgenic mice that permits inducible and reversible inhibition of synaptic transmission and applied it to the trisynaptic pathway while preserving transmission in the monosynaptic pathway. We found that synaptic output from CA3 in the trisynaptic pathway is dispensable and the short monosynaptic pathway is sufficient for incremental spatial learning. In contrast, the full trisynaptic pathway containing CA3 is required for rapid one-trial contextual learning, for pattern completion-based memory recall, and for spatial tuning of CA1 cells.  相似文献   

Isotope fractionation and atmospheric oxygen: implications for phanerozoic O(2) evolution   总被引：1，自引：0，他引：1  

Berner RA  Petsch ST  Lake JA  Beerling DJ  Popp BN  Lane RS  Laws EA  Westley MB  Cassar N  Woodward FI  Quick WP 《Science (New York, N.Y.)》2000,287(5458):1630-1633

Models describing the evolution of the partial pressure of atmospheric oxygen over Phanerozoic time are constrained by the mass balances required between the inputs and outputs of carbon and sulfur to the oceans. This constraint has limited the applicability of proposed negative feedback mechanisms for maintaining levels of atmospheric O(2) at biologically permissable levels. Here we describe a modeling approach that incorporates O(2)-dependent carbon and sulfur isotope fractionation using data obtained from laboratory experiments on carbon-13 discrimination by vascular land plants and marine plankton. The model allows us to calculate a Phanerozoic O(2) history that agrees with independent models and with biological and physical constraints and supports the hypothesis of a high atmospheric O(2) content during the Carboniferous (300 million years ago), a time when insect gigantism was widespread.  相似文献   

Mutations in dynein link motor neuron degeneration to defects in retrograde transport     

Hafezparast M  Klocke R  Ruhrberg C  Marquardt A  Ahmad-Annuar A  Bowen S  Lalli G  Witherden AS  Hummerich H  Nicholson S  Morgan PJ  Oozageer R  Priestley JV  Averill S  King VR  Ball S  Peters J  Toda T  Yamamoto A  Hiraoka Y  Augustin M  Korthaus D  Wattler S  Wabnitz P  Dickneite C  Lampel S  Boehme F  Peraus G  Popp A  Rudelius M  Schlegel J  Fuchs H  Hrabe de Angelis M  Schiavo G  Shima DT  Russ AP  Stumm G  Martin JE  Fisher EM 《Science (New York, N.Y.)》2003,300(5620):808-812

Degenerative disorders of motor neurons include a range of progressive fatal diseases such as amyotrophic lateral sclerosis (ALS), spinal-bulbar muscular atrophy (SBMA), and spinal muscular atrophy (SMA). Although the causative genetic alterations are known for some cases, the molecular basis of many SMA and SBMA-like syndromes and most ALS cases is unknown. Here we show that missense point mutations in the cytoplasmic dynein heavy chain result in progressive motor neuron degeneration in heterozygous mice, and in homozygotes this is accompanied by the formation of Lewy-like inclusion bodies, thus resembling key features of human pathology. These mutations exclusively perturb neuron-specific functions of dynein.  相似文献   

The area requirements for certain activities of laying hens in cages     

H Bogner  W Peschke  V Seda  K Popp 《Berliner und Münchener tier?rztliche Wochenschrift》1979,92(17):340-343

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An unusual outbreak of histomonosis in a commercial turkey flock     

Popp C  Hauck R  Blazey B  Hänel A  Hafez HM 《Berliner und Münchener tier?rztliche Wochenschrift》2012,125(3-4):153-158

In the past histomonosis was very well controlled with Dimetridazole as a treatment and/or Nifursol as feed additive. In the European Union both products were banned in 1995 and 2003, respectively. This was followed by the re-emergence of the disease in the recent years. In the present case a farm with two houses was affected by the disease. In each house 2620 hens and 2620 toms were kept, separated by wire mesh. At the 53rd day of age the toms in house 1 showed general clinical symptoms, accompanied by a slightly raised mortality, which sharply increased in the following days. At necropsy all dead birds showed lesions typical for histomonosis in caeca and liver. Histomonosis was diagnosed by histopathology and PCR. Within five days cumulative mortality was 25.1%.The hens kept at the same house didn't show any symptoms. At day 57 two toms, which were kept in house 2, died and showed similar symptoms and lesions. Within the next three days 48 more birds died. Again the hens in house 2 showed neither clinical signs nor mortality. Treatment trials using herbal products and a change of litter directly after the onset of clinical signs did not reduce the mortality. On day 62 the toms of both houses were euthanized by CO2 in closed containers. The hens were kept until they were slaughtered in week 16 and did not show any evidence of histomonosis.  相似文献   

Pruritic cats — from a technician’s point of view     

Jennie Tait 《The Canadian veterinary journal. La revue veterinaire canadienne》2021,62(5):523

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IR-Spektroskopie: Eine Schnellmethode zur Prognose der N-Wirkung und relevanten Parameter von Biokomposten     

Peter Capriel  Thomas Ebertseder  Lutz Popp  Reinhold Gutser 《植物养料与土壤学杂志》1999,162(2):149-153

IR-spectroscopy: a rapid method to estimate the nitrogen effect and relevant parameters of biocomposts The suitability of infrared spectroscopy to estimate the short-term nitrogen effect and relevant parameters of biocomposts was investigated. Models were developed which are based on the infrared spectra (4000—400 cm^—1) of 81 different biocomposts. They enable an estimation of the nitrogen and yield effect in a pot trial, and a close prediction of relevant compost parameters (C_t, N_t, C_t/N_t, pH_5h). A major advantage compared with the conventional chemical and biological methods is the simultaneous prediction of the nitrogen and yield effect and relevant parameters from the IR spectrum of an ’unknown’︁ compost. In addition, the infrared spectroscopy is considerably more rapid.  相似文献