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中国蚜科一新纪录属四新纪录种(同翅目,蚜总科) 总被引:1,自引:1,他引:0
研究了中国蚜科Aphididae 1新纪录属4新纪录种,包括蚜亚科Aphidinae蚜属Aphis 2新纪录种:番樱桃蚜Aphis eugeniae van der Goot,1917和粉蚜居梨亚种Aphis farinosa yanagicola Matsumura,1917;长管蚜亚科Macrosiphinae 1新纪录属:微小瘤蚜属Micromyzella Eastop,1955;2新纪录种:犹太微小瘤蚜Micromyzella judenkoi (Carver,1965)和香蕉交脉蚜卡拉第亚种Pentalonia nigronervosa caladii van der Goot,1917.提供了形态记述、寄主植物、分布及形态特征图.研究标本保存在英国自然历史博物馆. 相似文献
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中国新纪录属--长角斑蚜属研究(同翅目:蚜科:角斑蚜亚科) 总被引:4,自引:4,他引:0
研究了中国蚜科Aphididae角斑蚜亚科Calaphidinae 1新纪录属-长角斑蚜属Calaphis Walsh,1863,记述2新纪录种,居桦长角斑蚜Calaphis betulicola(Kaltenbach,1843)和相似长角斑蚜Calaphis similis Quednau,1979。编制中国长角斑蚜属分种检索表,每种提供形态记述、寄主植物、分布及形态特征图。研究标本保存在中国科学院动物研究所动物标本馆。 相似文献
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报道中国蚜科Aphididae 1新纪录属-麻黄蚜属Ephedraphis Hille Ris Lambers,1959和1新纪录种-麻黄蚜Ephedraphis gobica Szelegiewicz,1963。该蚜虫取食具有重要药用价值和固沙作用的麻黄属Ephedra spp.植物。麻黄蚜在中国采自宁夏回族自治区的盐池县和铜川市,国外分布在蒙古国,文中记述了麻黄蚜无翅孤雌蚜和有支孤雌蚜的形态特征及在中国的地理分布,绘制了形态特征图,研究标本保存在中国科学院动物研究所动物标本馆。 相似文献
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记述了中国蚜科Aphididae蚜亚科Aphidinae蚜族Aphidini蚜亚族Aphidina蚜属Aphis1新纪录亚属,囊蚜亚属Aphis(Bursaphis)Baker,1934;及2新纪录种,柳叶菜蚜Aphis(Aphis)praeterita Walker,1849和茶藨子囊蚜Aphis(Bursaphis)grossulariae Kaltenbach,1843。提供了中国蚜属分亚属检索表、地理分布与寄主植物信息,绘制了形态特征图。研究标本保存在中国科学院动物研究所国家动物博物馆。 相似文献
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研究了中国烟管蚜属Vesiculaphis del Guercio,该属隶属于蚜科Aphididae蚜亚科Aphidinae长管蚜族Macrosiphini,中国已知两种:番木瓜烟管蚜Vesiculaphis caricis(Fullaway)和中国新纪录种,马醉木烟管蚜V.pieridis Basu。文中提供了中国物种分种检索表,对新纪录种提供了不同生物型的形态记述、特征图和照片,包括1个兼有无翅孤雌蚜和有翅孤雌蚜性状的特殊个体的描记。研究标本保存在中国科学院动物研究所动物标本馆和英国自然历史博物馆. 相似文献
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中国椴斑蚜属Tiliaphis Takahashi已知2种,朝鲜椴斑蚜Tiliaphis coreanus Quednau,1979和小椴斑蚜T.shinae(Shinji,1924)(中国新纪录)。文中提供了分种检索表,各种提供了观察标本、地理分布、寄主植物等信息新纪录种提供了详细的形态记述和形态特征图。研究标本保存在中国科学院动物研究所动物标本馆。 相似文献
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研究了中国蚜科Aphididae角斑蚜亚科Myzocallidinae1新纪录属,即新桦斑蚜属Neobetulaphis Basu,1964。中国分布3种,其中包括2新纪录种,白新桦斑蚜N.alba Higuchi,1972和裸新桦斑蚜N.pusilla Basu,1964。每种提供了观察标本,地理分布,寄主植物等信息;新纪录种还提供了较详细的形态和形态特征图。研究标本保存在中国科学院动物研究所动物标本馆。 相似文献
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A novel blue‐emitting Sr3.5Y6.5O2(PO4)1.5(SiO4)4.5:Eu2+ phosphor was synthesized via a solid‐state reaction. Powder X‐ray diffraction (XRD) analysis demonstrated that the Sr3.5Y6.5O2(PO4)1.5(SiO4)4.5 host had a hexagonal crystal structure in the space group P63/m and unit cell parameters a = 9.418 Å, c = 6.900 Å. The as‐prepared phosphor showed a blue emission and all the main emission peaks were located at around 466 nm for different excitation wavelengths of 297, 333 and 391 nm. The temperature dependence of the photoluminescence property was investigated in the range 20–250 °C, and the emission intensity decreased to 71% of the initial value at room temperature on increasing the temperature to 150 °C. According to the classical theory of fluorescent thermal quenching, the activation energy (ΔE) for the thermal quenching luminescence of the as‐prepared Sr3.45Y6.5O2(PO4)1.5(SiO4)4.5:0.05Eu2+ phosphor was determined to be 0.20 eV. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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Masamitsu Doi Yoshinori Nishi Susumu Uchiyama Yuji Nishiuchi Hideki Nishio Takashi Nakazawa Tadayasu Ohkubo Yuji Kobayashi 《Journal of peptide science》2005,11(10):609-616
For the rational design of a stable collagen triple helix according to the conventional rule that the pyrrolidine puckerings of Pro, 4-hydroxyproline (Hyp) and 4-fluoroproline (fPro) should be down at the X-position and up at the Y-position in the X-Y-Gly repeated sequence for enhancing the triple helix propensities of collagen model peptides, a series of peptides were prepared in which X- and Y-positions were altogether occupied by Hyp(R), Hyp(S), fPro(R) or fPro(S). Contrary to our presumption that inducing the X-Y residues to adopt a down-up conformation would result in an increase in the thermal stability of peptides, the triple helices of (Hyp(S)-Hyp(R)-Gly)(10) and (fPro(S)-fPro(R)-Gly)(10) were less stable than those of (Pro-Hyp(R)-Gly)(10) and (Pro-fPro(R)-Gly)(10), respectively. As reported by B?chinger's and Zagari's groups, (Hyp(R)-Hyp(R)-Gly)(10) which could have an up-up conformation unfavorable for the triple helix, formed a triple helix that has a high thermal stability close to that of (Pro-Hyp(R)-Gly)(10). These results clearly show that the empirical rule based on the conformational preference of pyrrolidine ring at each of X and Y residues should not be regarded as still valid, at least for predicting the stability of collagen models in which both X and Y residues have electronegative groups at the 4-position. 相似文献
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Pérez-Pantoja D Guzmán L Manzano M Pieper DH González B 《Applied and environmental microbiology》2000,66(4):1602-1608
The enzymes chlorocatechol-1,2-dioxygenase, chloromuconate cycloisomerase, dienelactone hydrolase, and maleylacetate reductase allow Ralstonia eutropha JMP134(pJP4) to degrade chlorocatechols formed during growth in 2,4-dichlorophenoxyacetate or 3-chlorobenzoate (3-CB). There are two gene modules located in plasmid pJP4, tfdC(I)D(I)E(I)F(I) (module I) and tfdD(II)C(II)E(II)F(II) (module II), putatively encoding these enzymes. To assess the role of both tfd modules in the degradation of chloroaromatics, each module was cloned into the medium-copy-number plasmid vector pBBR1MCS-2 under the control of the tfdR regulatory gene. These constructs were introduced into R. eutropha JMP222 (a JMP134 derivative lacking pJP4) and Pseudomonas putida KT2442, two strains able to transform 3-CB into chlorocatechols. Specific activities in cell extracts of chlorocatechol-1,2-dioxygenase (tfdC), chloromuconate cycloisomerase (tfdD), and dienelactone hydrolase (tfdE) were 2 to 50 times higher for microorganisms containing module I compared to those containing module II. In contrast, a significantly (50-fold) higher activity of maleylacetate reductase (tfdF) was observed in cell extracts of microorganisms containing module II compared to module I. The R. eutropha JMP222 derivative containing tfdR-tfdC(I)D(I)E(I)F(I) grew four times faster in liquid cultures with 3-CB as a sole carbon and energy source than in cultures containing tfdR-tfdD(II)C(II)E(II)F(II). In the case of P. putida KT2442, only the derivative containing module I was able to grow in liquid cultures of 3-CB. These results indicate that efficient degradation of 3-CB by R. eutropha JMP134(pJP4) requires the two tfd modules such that TfdCDE is likely supplied primarily by module I, while TfdF is likely supplied by module II. 相似文献
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We analysed the endogenous cytokinin levels of Dendrobium Madame Thong-In seedlings grown in vitro during vegetative and flowering-inductive periods. HPLC was used to fractionate the extracts and radioimmunoassay (RIA) was used for assay of zeatin (Z), dihydrozeatin (DZ), N(6)-(Delta(2)-isopentenyl)-adenine (iP) and their derivatives. Coconut water used in experiments was found to contain high level (>136 pmol ml(-1)) of zeatin riboside (ZR). Protocorms and seedlings cultured in medium with coconut water were found to contain 0.5-3.9 pmol g(-1) FW of the cytokinins analysed. Seedlings (1.0-1.5 cm) cultured in flowering-inductive liquid medium containing 6-benzyladenine (BA, 4.4 muM) and coconut water (CW, 15%) contained up to 200 and 133 pmol g(-1) FW of iP and iPA, respectively. These levels were significantly higher than all other cytokinins analysed in seedlings of the same stage and were about 80- to 150-folds higher than seedlings cultured in non-inductive medium. During the transitional (vegetative to reproductive) stage, the endogenous levels of iP (178 pmol g(-1) FW) and iPA (63 pmol g(-1) FW) were also significantly higher than cytokinins in the zeatine (Z) and dihydrozeatin (DZ) families in the same seedlings. Seedlings that grew on inductive medium but remained vegetative contained lower levels of iPA. The importance of the profiles of iP and its derivatives in induction of in vitro flowering of D. Madame Thong-In is discussed. 相似文献
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The biology of the fruit fly Bactrocera tau, an important horticultural pest, was studied under laboratory conditions at 25°C and 60–70% relative humidity on Cucurbita maxima. The duration of mating averaged 408.03 ± 235.93 min. After mating, the female fly had a preoviposition period of 11.7 ± 4.49 days. The oviposition rate was 9.9 ± 8.50 eggs and fecundity was 464.6 ± 67.98 eggs/female. Eggs were elliptical, smooth and shiny white, turning darker as hatching approached, and measured 1.30 ± 0.07 mm × 0.24 ± 0.04 mm. The chorion has polygonal microsculpturing and is species-specific with polygonal walls. The egg period lasts for 1.3 ± 0.41 days. The duration of the larval period is 1.2 ± 0.42, 1.7 ± 0.48 and 4.0 ± 0.94 days for first, second and third instars, respectively. Pupation occurs in the sand or soil and pupal periods are 7.0 ± 0.47 days. The life cycle from egg to adult was completed in 14.2 ± 1.69 days; the longevity of mated females and males was 130.33 ± 14.18 and 104.66 ± 31.21 days, respectively. At least two to three generations were observed from June 2008 to June 2009. 相似文献
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The formation of cationic palladium(II)complexes [TrpyPdII]+X− by salt metathesis of the respective trifluoroacetates with different salts of weakly coordinating anions X− was investigated. With non-hydrolizable counterions, cationic mono- and dinuclear complexes are observed depending on the nature of the anion X− and the solvent. The mononuclear cations, which are only formed with X = BArF, most probably carry a weakly bound molecule of dichloromethane at the fourth coordination site of PdII. When treated with diazoalkanes, only these are sufficiently reactive to form carbene complexes. Four- and five coordinate Lewis base adducts [TrpyPdIIL]+ with L = CH3NC, tBuNH2, PMe3, PEt3 and PiPr3 and [TrpyPdIIL2]+ with L = PMe3 were prepared from the mononuclear cations [TrpyPdII]+BArF−. From structural studies it becomes apparent, that the formation of stable five coordinate PdII species is restricted to medium size ligands and depends on the delicate balance between the steric influence of L and the strain, which is induced on the TrpyPdII unit. 相似文献
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Nageswara Raju C Adinarayana Reddy C Sailaja S Seo HJ Sudhakar Reddy B 《Luminescence》2012,27(5):334-340
This article reports on the optical properties of Er3+ ions doped CdO–Bi2O3–B2O3 (CdBiB) glasses. The materials were characterized by optical absorption and emission spectra. By using Judd–Ofelt theory, the intensity parameters Ωλ (λ = 2, 4, 6) and also oscillatory strengths were calculated from the absorption spectra. The results were used to compute the radiative properties of Er3+:CdBiB glasses. The concentration quenching and energy transfer from Yb3+–Er3+ were explained. The stimulated emission cross‐section, full width at half maximum (FWHM) and FWHM × values are also calculated for all the Er3+:CdBiB glasses. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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R M Wartell 《Biopolymers》1972,11(4):745-759
Helix–coil transition curves are calculated for poly (dA) poly(dT) and poly (dA-dT) poly (dA-dT) using the integral equation approach of Goel and Montroll.5 The transitions are described by the loop entropy model with the exponent of the loop entropy factor, k, remaining an arbitrary constant. The theoretical calculations are compared with experimental transition curves of the two polymers. Results indicate that the stacking energies for these two polymers differ by about 1 kcal/mole of base pairs. Also, a fit between theory and experiment was not possible for k > 1.70. 相似文献