Changes in wettability of wood surface using electron beam irradiation     

H. Huber  R. Haas  A. Petutschnigg  G. Grüll 《Wood material science & engineering》2020,15(4):237-240

ABSTRACT

This study deals with the influence of electron beam irradiation (EBI) on the wettability of Norway spruce surface samples. To evaluate this possible effect in detail, the changes in chemistry and wood structure were analysed using the methods of IR spectroscopy and Scanning Electron Microscopy (SEM). The surface wettability was determined by the contact angle measurement method. The results of infrared spectra show decreased relative numbers of available hydrophilic groups (e.g. hydroxyl and carbonyl groups) in the wood surfaces due to the electron beam irradiation. This behaviour is consistent with the values from the surface wettability measurements. Structural differences of the wood surfaces after electron beam irradiation were not detectable. Based on these findings pre-treatment of wood surfaces for industrial usages can be a potential field of application of this technology.  相似文献   

Biological control of crown gall in rose nursery stock     

E. Farkas  Jerry H. Haas 《Phytoparasitica》1985,13(2):121-127

Rooted plants and cuttings ofRosa indica were dipped or sprayed withAgrobacterium radiobacter strain 84 and planted in a commercial rose nursery. Crown gall was controlled effectively and equally well when the protectant inoculum was grown in broth or on agar and used for treating plants which were immediately planted in naturally infested soil (mean disease control was 91%). Untreated rooted-plant stock and unrooted cuttings had 20% and 0.7% galled plants, respectively, at the end of 8 months in the field; plants and cuttings dipped inA. radiobacter} inoculum had 0.6% and 0.1% galled plants, respectively. Spraying with inoculum also gave effective control of the disease. Fewer plants of the untreated nursery stock survived the 8 months between planting and harvesting than treated stock.  相似文献   

The danger of exotic animal epidemics to the domestic animal population     

O R Kaaden  L Haas 《DTW. Deutsche tier?rztliche Wochenschrift》1988,95(5):207-210

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Abstracts of papers presented at a meeting of the weed science society of israel on possibilities of reducing herbicide use     

Stuart Z. Cohen  A. Eisenberg  U. Mingelgrin  Z. Gerstl  Sarina Saltzman  M. Davis  Z. Paster  H. Haas  Y. Kleifeld  U. Rosenberg  J. C. Caseley  B. Rubin  H. H. Lebaron  M. Horowitz  Ziva Amsellem  A. Sharon  J. Gressel  H. Aviram  E. Shlevin 《Phytoparasitica》1991,19(4):319-330

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Aphakia in a German Holstein calf     

Schulze U  Kuiper H  Schmidtbauer S  Wohlsein P  Krause A  Haas L  Distl O 《DTW. Deutsche tier?rztliche Wochenschrift》2006,113(9):355-357

Aphakia and further malformations of both eyes were diagnosed in a female German Holstein calf. Besides aphakia of the left eye, the calf exhibited microphthalmia, glaucoma and a hypoplastic uveoscleral tissue. Additional findings in the right eye were buphthalmus and glaucoma. Instead of aphakia, pathohistological and investigations revealed a very small (microphakia) and luxated lens. Neither the clinical nor the pathological examination revealed further malformations of other organs. A BVD infection could be excluded as cause for the ocular malformations observed. A deficiency or excess of vitamine A was unlikely because this would have also applied to all other calves born at the same time on the farm. An inbreeding coefficient of 3.168% for the malformed calf and the exclusion of environmental causes for these malformations of the eyes let us suppose a hereditary problem.  相似文献   

Cuts in Homeland Security research     

Busta F  Clarke N  Goldman LR  Haas C  Kelen G  Lafree G  Rose J  von Winterfeldt D 《Science (New York, N.Y.)》2006,313(5793):1571

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Foot-and-mouth disease and its differential diagnoses     

Teifke JP  Breithaupt A  Haas B 《Tier?rztliche Praxis. Ausgabe G, Grosstiere/Nutztiere》2012,40(4):225-37; quiz 238

Foot-and-mouth disease (FMD) is a highly contagious viral disease of cloven-hoofed animals, which leads to the formation of vesicles, erosions und ulcerations in the mouth and hairless parts of the skin, in particular on the feet. Due to its dramatic economic consequences, FMD is considered to be one of the most important diseases of animals. There is a permanent risk of introduction of the virus into Europe due to travel and illegal importation of agricultural products. Cloven-hoofed animals (cattle, sheep, goats, pigs and related game animals) are the typical hosts of the FMD virus. However, some zoo and wild animals belonging to other taxonomical groups, such as giraffes, elephants and camels, are also susceptible. Stomatitis and infections of the feet in livestock occur quite frequently, and often the causes of these conditions remain obscure. Sometimes, a differentiation from FMD is not possible on the basis of clinical signs and gross lesions, necessitating further laboratory investigations. This applies in particular to cases caused by the agents of vesicular stomatitis (VS) and swine vesicular disease (SVD). Additionally, other infectious agents can cause stomatitis, e.g. the viruses of mucosal disease (MD), malignant catarrhal fever (MCF), rinderpest, peste des petits ruminants (PPR), papular stomatitis, orf, blue tongue (BT) and epizootic haemorrhagic disease (EHD). In sheep, a stomatitis of unclear etiology was described as "OMAGOD". Furthermore, bacteria, chemicals and mechanical trauma can cause stomatitis and pododermatitis.  相似文献   

Cauliflower stunt associated with a phytoplasma of subgroup 16SrIII-J and the spatial pattern of disease     

M. C. C. Rappussi  B. Eckstein  D. Fl?res  I. C. R. Haas  L. Amorim  I. P. Bedendo 《European journal of plant pathology / European Foundation for Plant Pathology》2012,133(4):829-840

Since 2000, a disease has occurred with high levels of incidence in crops of cauliflower grown in the green belt area of the city of S?o Paulo, Brazil. The symptoms are characterized by stunting, malformation of the inflorescence, reddening leaves, and vascular necrosis, suggesting infection by phytoplasma. These symptoms are similar to those described in Brassicas species affected by the aster yellows (16SrI) group of phytoplasma. In the present study, a phytoplasma from the 16SrIII-J subgroup was identified in cauliflower plants based on actual and virtual RFLP patterns and phylogenetic analysis, and was distinct from the phytoplasmas frequently associated with aster yellows disease in Brassicas. Pathogenicity assays using dodder confirmed that the identified phytoplasma is the agent of the observed disease, which is here designated as cauliflower stunt. Consequently, this species of Brassica may be recognized as a new host for subgroup 16SrIII-J, which has frequently been found in diverse species cultivated in Brazil. The spatial pattern of diseased plants was determined in ten cauliflower plots of 300 to 728 plants each. All plants in these plots were evaluated by visual assessments, assigned as diseased or healthy and mapped. The dispersion index and Taylor’s power law were determined for various quadrat sizes and the results showed that the diseased plants were distributed in a random pattern in fields with a low disease incidence and in an aggregated pattern in fields with a disease incidence greater than 25?%. According to an isopath area analysis, diseased plants were predominantly present in the field borders, suggesting that the pathogen is possibly introduced by vector(s) from the external area.  相似文献   

Sulfometuron-resistant Amaranthus retroflexus: cross-resistance and molecular basis for resistance to acetolactate synthase-inhibiting herbicides   总被引：3，自引：0，他引：3  

M Sibony  A Michel  H U Haas  B Rubin  & K Hurle 《Weed Research》2001,41(6):509-522

A biotype of Amaranthus retroflexus L. is the first weed in Israel to develop resistance to acetolactate synthase (ALS)-inhibiting herbicides. The resistant biotype (Su-R) was collected from Ganot, a site that had been treated for more than 3 consecutive years with sulfometuron-methyl + simazine. On the whole-plant basis, the resistance ratio ( ED₅₀ Su-R)/( ED₅₀ Su-S) was 6–127 for sulfonylureas, 4–63 for imidazolinones, 20–35 for triazolopyrimidines and 11 for pyrithiobac-sodium. Similar levels of resistance were found also when the herbicides were applied before emergence. Based on a root elongation bioassay, Su-R was 3240-fold more resistant to sulfometuron-methyl than Su-S. In vitro studies have shown that the Su-R biotype was resistant at the enzyme level to all ALS inhibitors tested. The nucleotide sequences of two amplified regions between the Su-S and the Su-R differed in only one nucleotide. One substitution has occurred in domain A, cytosine by thymine (C C C to C T C) at position 248, that confers an exchange of the amino acid proline in the susceptible to leucine in the Su-R. The proline to leucine change in domain A is the only difference in the amino acid primary structure of the regions sequenced, indicating that it is responsible for the ALS-inhibitor resistance observed.  相似文献   

Renal lipomatosis in a lamb          下载免费PDF全文

Wobeser G  Haas S 《The Canadian veterinary journal. La revue veterinaire canadienne》2004,45(10):863-864

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