农民致富的领路人——记“省青年星火带头人标兵”叶明

叶明是松溪县长巷村农技员。在松溪县河东乡长巷村，挺起叶明，每个农民都会竖起太拇指说：“叶明，是我们农民群众信得过的农技员。”

Effects of Phosphate and Lime Application on Growth of Trifolium repens,Chamaecrista rotundifolia and Macroptilium atropurpureum in Red Soils

[Objective] The aim was to research effects of P fertilizer and lime on growth of Trrifolium repens, Chamaecrista rotundifolia and Macroptilium atropur- pureum, to provide references for cultivation of the three plants. [Method] Pot experiments were conducted with Trrifolium repens, Charnaecrista rotundifolia and Macroptilium atropurpureum in 2010 in order to research effects of lime and P fer-tilizer mixture on growth of the plants in southern hilly acidic red soils. [Result] With lime amount fixed, application of P fertilizer would enhance plant height, total tiller number and dry matter. When P fertilizer was not applied, however, plant height of the three plants achieved the peak by lime at 1.4 g/kg which proved best for improvement of acidity of red soils. With P fertilizer at 200 mg/kg was applied, biomass of Trifolium repens and Macroptilium atropurpureum achieved the highest by lime at 2.1 g/kg, but total biomass of Chamaecrista rotundifolia was the highest by lime at 1.4 g/kg. [Conclusion] The research provides references for planting and production of Trifolium repens, Chamaecrista rotundifolia and Macroptilium atropur-pureum in southern hilly regions.

Determination of Emodin and Chrysophanol Contents in Callus of Cassia tora L. Leaf

[ Objective] Through inductive culture, emodin and chrysophanol contents in cassia seed were increased. [ Method ] MS culture medium was used to bourgeon seedlings of cassia seed and to induce cotyledon callus of cassia seed while HPLC method was adopted to determine emodin and ehrysophanol eontents.[ Result] Emedin and chrysophanol contents in cotyledon callus were 0. 099% and 0. 312%, respectively, while they were 0.029% and 0. 190% respectively in cassia seed. [ Conclusion] The method of inducing cotyledon callus was helpful for increasing emodin coment in cassia seed.

An Analytic and Combinatorial-Geometric Proof of a Knopp-Type Identity for Multiple Dedekind Sums

In this paper, we define multiple Dedekind sums by products of Bernoulli functions. From the Fourie expansions of Bernoulli functions, we express the Dedekind sums as series representatios. Then by a combinatorial-geometric method, we give a new proof of a Knopp-type identity for the Dedekind sums.

Permutation-substitution image encryption scheme based on a modified chaotic map in transform domain

A new chaotic image encryption scheme based on permutation and substitution in the Fourier domain is presented.Fractional Fourier Transform(FRFT)is used before the encryption scheme to get a large degree of randomization.The permutation is achieved by Baker map and the substitution by a key-related-to-plain-image algorithm based on the modified Logistic map.Modification of the Logistic map is developed to increase the space of the encryption key,and hence increase the security.The key of the encryption algorithm dependents on the plain image,and thus,the cipher image is sensitive to both the initial key and the plain image to resist known-plaintext and chosen plaintext attacks.The key space is large and hence the algorithm can effectively resist brute-force attacks.The proposed scheme is examined using different performance evaluation metrics and the results prove that the proposed scheme is highly secure,and it can effectively resist different attacks.

Vitreoscilla hemoglobin gene(vgb)improves lutein production in Chlorella vulgaris

Vitreoscilla hemoglobin is an oxygen-binding protein that promotes oxygen delivery and reduces oxygen consumption under low oxygen conditions to increase the effi ciency of cell respiration and metabolism.In this study,we introduced a Vitreoscilla hemoglobin gene(vgb)into Chlorella vulgaris by Agrobacterium tumefaciens-mediated transformation(ATMT).PCR analysis confi rmed that the vgb gene was successfully integrated into the Chlorella vulgaris genome.Analysis of biomass obtained in shake fl asks revealed transformant biomass concentrations as high as 3.28 g/L,which was 38.81% higher than that of the wild-type strain.Lutein content of transformants also increased slightly.Further experiments recovered a maximum lutein yield of 2.91 mg/L from the transformants,which was 36.77% higher than that of the wild-type strain.The above results suggest that integrated expression of the vgb gene may improve cell growth and lutein yield in Chlorella vulgaris,with applications to lutein production from Chlorella during fermentation.

陆德明叶音及其古韵分部

在以往"韵缓"说研究基础上,以陆德明叶音为切入点,推考陆德明心目中的古韵,得古韵九部。陆德明古韵可以视为古韵分部之滥觞。

月亮记住了

受伤的月亮失去了记忆,流落在人间,碰到一个小男孩。小男孩细心地呵护它,为它取暖。月亮从忽明忽灭的晃动,到在屋里四处走动,经过海上三天三夜的漂流,后来,学会在空中旋转。最后,小男孩带着恢复健康的月亮穿越风雨,回到天空。

诗句变变变

晚唐著名诗人杜牧有一首脍炙人口的绝句《清明》，诗云：“清明时节雨纷纷，路上行人欲断魂。借问酒家何处有，牧童遥指杏花村。”

On Weil's explicit formula

A program of proving the Riemann hypothesis by using the Fourier analysis on global fields is given by Connes(1999). The difficulty for realizing the program lies in proving the validity of Connes' global trace formula on an L2-space. In this paper, a new global trace formula is obtained on a Fr′echet space which gives the Weil distribution △(h).

Effect of moxa smoke produced during combustion of Aiye(Folium Artemisiae Argyi) on behavioral changes in mice inhaling the smoke

OBJECTIVE: To evaluate the effects that inhalation of the combustion products of the traditional Chinese herb Aiye(Folium Artemisiae Argyi) has on the central nervous system.METHODS: Forty Kunming mice(half male) were randomly assigned(n = 10/group) to a control group(C) or one of three moxa smoke concentration groups(% opacity): low(L1; 0.4%), medium(M1; 2%), and high(H1; 15%). Mice in the latter three groups were exposed to moxa smoke in a dynamic gas exposure cabinet for 20 min per day for7 days. Mice in control group were placed in the same cabinet without any intervention. For the sleep experiments, another 50 mice were divided into five groups of 10 mice each: a saline-injected control group, L1 + pentobarbital sodium(PS)-injected group, M1+PS group, H1(15%)+PS group,and a positive control group(10 mg/kg, chlorpromazine, p.o.). The weight, general activities, locomotor activities, rotarod performance, sleep duration,and sleeping rate induced by a subthreshold dose of pentobarbital sodium were recorded in the mice,and the composition of moxa smoke was analyzed using headspace gas chromatography(GC-HS).RESULTS: A low concentration of smoke significantly decreased the frequency of locomotor activities and the time for which the mice remaining on the rotarod; however, a high smoke concentration significantly prolonged the pentobarbital-induced sleeping time and sleeping rate.CONCLUSION: The concentration-dependent relaxing effects of moxa smoke on the Central Nervous System(CNS) were confirmed. Moreover, GC-HS analysis showed that the component present in the highest concentration in moxa smoke was eucalyp-tol, an essential oil well recognized for its soothing effects on the CNS. This may therefore be accountable for the sedative effects of moxa smoke.

In-situ interaction of nano-PbS with gelatin

Water-soluble gelatin-PbS bionanocomposites （BNCs） were synthesized via a facile one-pot chemical reaction method at pH 7.40. The samples were characterized by transmission electron microscopy （TEM）, X-ray diffraction （XRD）, UV-vis absorption spectra （UV-vis）, Fourier transform infrared spectra （FT-IR） and circular dichroism （CD）. FT-IR data were used to envis- age the binding of PbS particles with oxygen atoms of carbonyl groups of gelatin molecule. The possible integration mechanism between gelatin and PbS was discussed in detail. The effect of Pb2＋ and PbS on the conformations of gelatin has also been analyzed by means of UV-vis, CD and FT-IR spectra, resulting in less c^-helix content and more open structures （[3-sheet, r-turn, or expanded）. A new formula to calculate the association constant was proposed according to the relationship between the absorbance of gelatin-PbS BNCs and the free concentration of PbS, and apparent association constants K （298/303/308 K： 3.11/2.00/1.60 × 10^6 tool/L） at three different temperatures were calculated based on this formula. Thermodynamic parameters such as AG^θ, △Hθ and △S^θ were also determined. The results of the thermodynamic investigations indicated that the reaction was spontaneous （AG^θ 〈 0）, and enthalpy-driven （△H^8 〈 0）.