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Abstract  

For vibrating strings with symmetric single-well densities, it is known that the ratio λ211 is maximized when the density is constant. In this note, we extend this result to a class of symmetric densities.

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Abstract  

We establish several comparison results on the eigenvalue gap for vibrating strings with symmetric single-well densities or symmetric double-well densities.

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Enteritis is a serious problem for patients having received abdominal radiation. This study was to investigate whether zinc affected intestinal injury induced by the radiation. ICR mice were divided randomly into three groups and treated with one of three different compounds. Two of the compounds contained zinc (gluconate and amino acid chelated with bovin prostate extract) and one was water. One week after receiving the treatment, they were irradiated with 6 or 10 Gy at the abdominal region. One, 2, and 4 weeks after the irradiation the animals were sacrificed to examine the histological changes in the intestinal mucosa. The apoptotic cell numbers were found to be significantly higher after irradiation. The number of the apoptotic cells increased with increasing radiation doses. In this study we found that zinc appears to have the capability to lower the occurrence of apoptosis in the intestinal mucosa, thus protecting intestinal mucosa from injuries. Based on this finding, it would be reasonable to suggest that zinc could be used as food supplements in patients with cancer receiving radiotherapy in a hope to reduce radiation induced toxicity.

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Abstract  

Five kinds of urinary stones from 42 patients have been determined for a total of 19 elements by instrumental neutron activation analysis. Of these elements, Ca, Mg, Sr, Na, and Cl are found to be present in the core of all kinds of stones. The differences in elemental composition among the different kinds of stones as well as across the layers of stone are statistically evaluated.

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In order to breed rice cultivars for resistance to the brown planthopper, Nilaparvata lugens Stål (BPH) in Bangladesh, were evaluated for resistance in greenhouse screening tests. Over a period of six years (2005–2010), 1,767 entries/cultivars were screened using the plant hopper screening (PHS) system. The results showed 87 donors possessing different levels of resistance to the BPH. One exotic cultivar was highly resistant to the BPH and 86 materials showed medium resistance (tolerance) to the BPH. The rest of the materials including germplasm, F2, exotic, IRBPHN (International Rice Brown Planthopper Nursery) and advanced lines were susceptible. Most of entries coming from the International Rice Research Institute (IRRI) via the IRBPHN were moderately resistant.

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Abstract  

By substututing99Mo for the Mo in the reconstituted MoFe protein, the nuclear quadrupole interactions (NQI) of99Mo have been measured using the perturbed angular correlations (PAC). Two well-defined electric quadrupole interaction parameters have been observed. The configuration of the M-Center of the MoFe protein is identified by the quadrupole couplign constant Q1(412(9)MHz) and the asymmetry parameter 1(0.49(5)). Other parameters, VQ2(1939(13)MHz) and 1(0.90(1)), may correspond to a deformation M—Center of MoFe protein.

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Abstract  

The damage in the pup rat brain with low-level mercury exposure, and the concentration variation of trace elements in the rat hippocampus was determined by synchrotron radiation X-ray fluorescence technique (SRXRF). Meanwhile, the levels and activities of glutathione (GSH), glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), catalase (CAT) and malondialdehyde (MDA) in the hippocampus were also measured. The results showed that the low dose of inorganic mercury prenatal and postnatal exposure could lead to the significant increase of both copper and zinc contents and remarkable decrease of iron content in pup rat brain. Compared to the control group, the activities of antioxidant enzymes such as GSH-Px, SOD, the contents of GSH and MDA in the pup rat hippocampus of mercury-exposed group fell down obviously.

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Cereal Research Communications
Authors: D. Huang, H. Zhang, M. Tar, Y. Zhang, F. Ni, J. Ren, D. Fu, L. Purnhauser, and J. Wu

Stripe or yellow rust (Yr), caused by Puccinia striiformis Westend. (Pst), is one of the most important wheat diseases worldwide. New aggressive Pst races can spread quickly, even between countries and continents. To identify and exploit stripe rust resistance genes, breeders must characterize first the Pst resistance and genotypes of their cultivars. To find new sources of resistances it is important to study how wheat varieties respond to Pst races that predominate in other continents. In this study we evaluated stripe rust resistance in 53 Hungarian winter wheat cultivars in China. Twenty-four cultivars (45.3%) had all stage resistance (ASR) and 1 (1.9%) had adult-plant resistance (APR), based on seedling tests in growth chambers and adult-plant tests in fields. We molecularly genotyped six Yr resistance genes: Yr5, Yr10, Yr15, Yr17, Yr18, and Yr36. Yr18, an APR gene, was present alone in five cultivars, and in ‘GK Kapos’, that also had seedling resistance. The other five Yr genes were absent in all cultivars tested.

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Shuganjieyu (SGJY) capsule is a classical formula widely used in Chinese clinical application. In this paper, an ultra-performance liquid chromatography coupled with electrospray ionization and ion trap mass spectrometry has been established to separate and identify the chemical constituents of SGJY and the multiple constituents of SGJY in rats. The chromatographic separation was performed on a C18 RRHD column (150 × 2.1 mm, 1.8 μm), while 0.1% formic acid–water and 0.1% formic acid–acetonitrile was used as mobile phase. Mass spectral data were acquired in both positive and negative modes. On the basis of the characteristic retention time (R t) and mass spectral data with those of reference standards and relevant references, 73 constituents from the SGJY and 15 ingredients including 10 original constituents and 5 metabolites from the rat plasma after oral administration of SGJY were identified or tentatively characterized. This study provided helpful chemical information for further pharmacology and active mechanism research on SGJY.

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