Staying with AAP. Society AAP is also expert in taking care of non-primates     

van Bolhuis H  Wolters M 《Tijdschrift voor diergeneeskunde》2007,132(18):705-706

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Results from the lime experiment with potatoes for 1936     

Jackson B. Hester 《American Journal of Potato Research》1936,13(12):339-342

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The effect of some cryoprotectants on dromedary camel frozen‐thawed semen          下载免费PDF全文

DA El‐Badry  RH Mohamed  HA EL‐Metwally  TR Abo Al‐Naga 《Reproduction in domestic animals》2017,52(3):522-525

The cryopreserved camel semen is often associated with poor quality and fertility. This study aimed to improve the dromedary frozen semen quality by comparing the efficiency of four cryoprotectant agents (CPAs) on sperm freezability. Semen samples were collected from seven male Maghrabi camels, diluted with Shotor diluent supplemented with glycerol (Sh‐G), dimethyl formamide (DMF, Sh‐DF), dimethyl sulfoxide (DMSO, Sh‐DS) or ethylene glycol (EG, Sh‐EG), all at 6% final concentration, and the samples were subjected to cryopreservation. The results revealed the superiority of Sh‐DF over Sh‐G and Sh‐DS in terms of post‐thaw motility (55.83 ± 2.20 vs. 47.50 ± 4.33 and 45.00 ± 2.89%, respectively), sperm membrane (49.00 ± 0.58, 39.33 ± 3.33 and 42.67 ± 1.45%, respectively) and acrosomal integrities (53.00 ± 0.58, 57.33 ± 0.88 and 52.33 ± 1.45%, respectively). Sh‐EG group showed the lowest post‐thaw motility, plasma membrane and acrosome integrities (12.50 ± 1.44, 22.67 ± 1.45 and 30.67 ± 1.45, respectively). In conclusion, the protocols of dromedary camel semen cryopreservation could be enhanced using 6% DMF as a cryoprotectant agent.  相似文献   

Adenosine receptors: autoradiographic evidence for their location on axon terminals of excitatory neurons   总被引：11，自引：0，他引：11  

R R Goodman  M J Kuhar  L Hester  S H Snyder 《Science (New York, N.Y.)》1983,220(4600):967-969

Adenosine receptors were made visible on light microscopy by autoradiography with tritiated cyclohexyladenosine. In the cerebellum, adenosine receptors were absent in Weaver mice, which lack granule cells, and were displaced in Reeler mice, which have displacements of granule cells. Thus, adenosine receptors appear to be located on the axon terminals of excitatory granule cells in the cerebellum. Removal of one eye of a rat depleted adenosine receptors in the contralateral superior colliculus, suggesting that the receptors occur on axon terminals of excitatory projections from retinal ganglion cells. The presence of adenosine receptors on excitatory axon terminals may explain synaptic inhibition by adenosine and the behavioral effects of xanthines.  相似文献   

Femtosecond Dynamics of Excited-State Evolution in     

NH Damrauer  G Cerullo  A Yeh  TR Boussie  CV Shank  JK McCusker 《Science (New York, N.Y.)》1997,275(5296):54-57

Time-resolved absorption spectroscopy on the femtosecond time scale has been used to monitor the earliest events associated with excited-state relaxation in tris-(2,2'-bipyridine)ruthenium(II). The data reveal dynamics associated with the temporal evolution of the Franck-Condon state to the lowest energy excited state of this molecule. The process is essentially complete in approximately 300 femtoseconds after the initial excitation. This result is discussed with regard to reformulating long-held notions about excited-state relaxation, as well as its implication for the importance of non-equilibrium excited-state processes in understanding and designing molecular-based electron transfer, artificial photosynthetic, and photovoltaic assemblies in which compounds of this class are currently playing a key role.  相似文献   

Solubility of Iron in Submerged Soils     

Hester JB  Shelton FA 《Science (New York, N.Y.)》1947,106(2763):595-596

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Prevalence and genotypes of Giardia duodenalis in dairy and beef cattle in farms around Charlottetown, Prince Edward Island, Canada     

Uehlinger FD  Greenwood SJ  O'Handley R  McClure JT  Coklin T  Dixon BR  de Boer M  Zwiers H  Barkema HW 《The Canadian veterinary journal. La revue veterinaire canadienne》2011,52(9):967-972

Prevalence of Giardia duodenalis in dairy and beef cattle on farms around Charlottetown, Prince Edward Island (Canada) was determined by analyzing feces using direct immunofluorescence antibody microscopy. Genotypes were determined by 16S-rRNA sequencing. Fecal samples (n = 892) were collected from adult cattle in dairy tie-stall, dairy free-stall, and beef herds (10 herds each), and from calves (n = 183) from 11 dairy farms. Prevalence rates were 38% and 51% in cows and calves, respectively. Giardia duodenalis was present in all dairy herds, in 9/10 beef herds and in calves from 10/11 herds examined. Prevalence rates were 40% and 41% for cows in tie- and free-stall herds, respectively, and 27% for beef cows. Zoonotic Assemblage A was found in 12.2% of calves concomitantly infected with Assemblage E. All successfully sequenced samples (114/128) from cows corresponded to Assemblage E. Giardia duodenalis is highly prevalent in cattle herds in Prince Edward Island and Assemblage A in calves is a potential public health concern.  相似文献   

Stable low-pressure hydrogen clusters stored in a binary clathrate hydrate     

Florusse LJ  Peters CJ  Schoonman J  Hester KC  Koh CA  Dec SF  Marsh KN  Sloan ED 《Science (New York, N.Y.)》2004,306(5695):469-471

Thermodynamic, x-ray diffraction, and Raman and nuclear magnetic resonance spectroscopy measurements show that clusters of H2 can be stabilized and stored at low pressures in a sII binary clathrate hydrate. Clusters of H2 molecules occupy small water cages, whereas large water cages are singly occupied by tetrahydrofuran. The presence of this second guest component stabilizes the clathrate at pressures of 5 megapascals at 279.6 kelvin, versus 300 megapascals at 280 kelvin for pure H2 hydrate.  相似文献   

Poor fruit setting in strawberries. I     

Hester G. Kronenberg 《Euphytica》1959,8(1):47-57

In 1949 at least one of the Jucunda strawberry clones selected in the Netherlands was found to have a strong tendency to bad fruit setting, causing malformed fruits, nubbins, and resulting in entire or partial crop failure. This phenomenon was by no means new and has since been of more or less frequent occurrence.In the present paper a survey is given of the possible causes of a poor fruit set in strawberries in general; in a second article the investigations of the Jucunda variety will be dealt with.External causes of poor fruit setting are spring frost during the blooming period; damage caused to flowers by parasites, either insects, mites or fungi; unfavourable weather conditions during flowering; in growing under glass insufficient air circulation and insufficient pollination by bees due to keeping the frames closed too much; insufficient pollination in overcrowded beds; and unfavourable structure of the soil. However, these external factors can be eliminated to some extent by cultural measures.Therefore a more serious problem is presented by sterility or incomplete fruit setting, which is very complicated and determined genetically. Genetically, two types of strawberries can be distinguished: the all-female type, which is heterozygous for the sex factor, and the more or less hermaphrodite-male type, which is homozygous for that factor. In this latter group all kinds of intermediate forms are encountered between the all-male type with entirely sterile pistils and the almost entirely female type with only very few stamens.A good variety should have both well-developed stamens and entirely fertile pistils. Besides a fairly large number of varieties of which the stamens are well- or fairly well-developed and which have a high to moderate percentage of good pollen, there areA good variety should have both well-developed stamens and entirely fertile pistils. Besides a fairly large number of varieties of which the stamens are well- or fairly well-developed and which have a high to moderate percentage of good pollen, there are some varieties of which the stamens are usually much less developed and which produce only a low percentage of good pollen.Pistil-sterility is reflected on the one hand in all pistils of one or more of the later flowers of the inflorescence failing to set, owing to which the receptacle does not swell and berries are not developed. This phenomenon is regularly encountered in seedlings. On the other hand a certain number of the pistils of a flower may fail to set, resulting in malformed fruits.  相似文献   

Fumonisin contamination and fusarium incidence in corn from Santa Catarina,Brazil     

van der Westhuizen L  Shephard GS  Scussel VM  Costa LL  Vismer HF  Rheeder JP  Marasas WF 《Journal of agricultural and food chemistry》2003,51(18):5574-5578

In Brazil, the southern region has the highest incidence of esophageal cancer and also the highest production and consumption of corn (Zea mays) products. Corn samples intended for human consumption from the western, northern, and southern regions of the state of Santa Catarina, southern Brazil, had mean total fumonisin B (B(1), B(2), and B(3)) levels of 3.2, 3.4, and 1.7 mg/kg, respectively. Fusarium verticillioides, the predominant fungus in the corn samples, had mean incidences (percent of kernels infected) of 14, 11, and 18% for the three regions, respectively. Additional corn samples intended for animal feed from the southern region had a mean total fumonisin level of 1.5 mg/kg and a mean F. verticillioides incidence of 10%. The fumonisin levels in corn from the state of Santa Catarina, Brazil, were similar to the high levels determined in other high esophageal cancer incidence regions of the world.  相似文献