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1.
The activities of green cell-free extracts of spinach leavesin performing photochemical transphosphorylation, photosyntheticphosphorylation, the HILL reaction and the light-induced formationof the endogenous reducing substance (ascorbic acid) were followedin parallel during the growth process of the plant. There wasa certain parallelism between the development of the activitiesof photochemical transphosphorylation, of photo-synthetic phosphorylationand of the HILL reaction, activities being low in the earlierstage of growth, reaching a maximum just before efflorescence,and showing thereafter a more or less sharp decline. The activityin the light-induced formation of endogenous reducing substancewas undetectable for the first 35 day-period of growth, reacheda maximum about one week earlier than the other three activities,and again disappeared after 60 days of growth. (Received September 9, 1960; ) 相似文献
2.
A new species of the genus Copidosoma from Israel is described. The female of Copidosoma trjapitzini is similar to those of C. scutellare, C. agrotis, and C. cuproviride. All the four species possess a similar mesosomal sculpture, coarse on the mesoscutum and more or less striate on the scutellum, and the solid clava obliquely truncate at apex. C. trjapitzini differs from C. agrotis in the larger size and from C. cuproviride, in the black head and mesosoma. The type material is deposited in the collection of the Schmalhausen Institute of Zoology (Ukraine, Kiev); two paratypes, at the Zoological Institute, Russian Academy of Sciences (St. Petersburg). 相似文献
3.
Two new species of the chalcidoid wasp genus Nikanoria are described. Nikanoria flavicoxa sp. n. from Israel belongs to the N. nigra species-group. It is similar to N. szelenyii Zer., but differs in the shorter genae, longer funicular segments of the female, and enlarged stigmal knob. N. declivis sp. n. from Mongolia and Israel belongs to the N. pavlovskii species-group and resembles N. stigma Zer., but differs in the longer funicular segments of the female, enlarged antennal club, and straight sides of the clypeus. A key to species of the genus Nikanoria is given. 相似文献
4.
Further studies on the role of cell-wall-degrading enzymes in cell-wall loosening in oat coleoptiles
A fungal endo-ß-l,3-glucanase was compared with afungal exo-ß-1,3-glucanase with respect to their effectson elongation and cell-wall extensibility in oat coleoptilesegments. The exo-enzyme enhanced elongation and extensibilityof the cell wall. Its effect was not additive to the effectof indole-3-acetic acid when given together with the latter,at least during 3 hr of incubation. Endo-glucanase showed nosignificant effect on elongation and no interaction with theexo-enzyme. Auxin and exo-glucanase increased extensibilityof the cell wall. The exo-glucanase was separated by isoelectricfocusing. The two fractions which were separated and showedglucanase activity induced elongation and cell wall loosening. (Received March 16, 1970; ) 相似文献
5.
Yoko Muraoka Christian H. Schulze Mihaela Pavli?ev Gábor Wichmann 《Journal of Ornithology》2009,150(2):313-319
Due to being a virtually monomorphic wader species, migration dynamics and sex-related migration patterns in the Wood Sandpiper
(Tringa glareola) have rarely been investigated. We captured spring migrants at an important stopover site in northeastern Austria. Birds
were individually color-marked, and sex was determined by an analysis of DNA from tail feather material. Among temporary residents
(birds seen again after day of capture), males migrated on average 3 days earlier than females. However, since sexes did not
differ in fat score, the length of stay and the proportion of transients (birds not seen again after day of capture) and temporary
residents, we suggest that males and females adopt similar migration strategies in the spring. The large number of transients
captured as well as shorter stopover durations in later temporary residents indicate that Wood Sandpipers minimize time at
this stage of their northbound migration. Temporary residents earlier in the season exhibited lower fat stores than later
ones. Nevertheless, since the fat stores of transients and temporary residents were similar even after the progress of the
season had been accounted for, we assume that Wood Sandpipers may afford to exhibit individual flexibility in migration strategy
and the use of stopover sites, especially early in the season. This variability may be a necessary adaptation to cope with
possible varying environmental conditions at dynamic and unpredictable inland stopover sites. After having reached North Mediterranean
regions, mean body mass of spring migrants gradually increases during successive stopovers, indicating that Wood Sandpipers
follow a ‘hopping’ migration strategy. This emphasizes the high conservation value of even small artificial mudflat pools
as important stepping stones in order to maintain a continuous network of wetland habitats for this continental migrant. 相似文献
6.
Pavlič JI Genova J Popkirov G Kralj-Iglič V Iglič A Mitov MD 《Chemistry and physics of lipids》2011,164(8):727-731
We present new and simple method for formation of giant unilamellar vesicles (GUVs) in high ionic strength solutions, such as phosphate buffered saline (PBS). Mechanoformation method is an alternative method to electroformation method. The advantage of the mechanoformation procedure is that there are no limitations with respect to the ionic strength of the aqueous solutions, because there is no applied electric potential thus no current flow through the formation cell and no electrolysis is induced. 相似文献
7.
J. Dulčić A. Pallaoro S. Matić‐Skoko B. Dragičević P. Tutman R. Grgičević N. Stagličić V. Bukvić J. Pavličević B. Glamuzina M. Kraljević 《Zeitschrift fur angewandte Ichthyologie》2011,27(5):1254-1258
Age, growth and mortality were analysed for the common two‐banded seabream, Diplodus vulgaris, collected in the eastern Adriatic (Croatian coast) from commercial fishery catches by ‘tramata’ fishing (2005–2006) to obtain growth estimation. The oldest female was estimated to be age 11, the oldest male age 10 years. The von Bertalanffy growth parameters estimated by reading scales were: L∞ = 48.60 cm (SE = 1.101), K = 0.112 (SE = 0.005) and t0 = ?2.366 (SE = 0.060) for all specimens; L∞ = 51.96 cm (SE = 2.153), K = 0.095 (SE = 0.007) and t0 = ?2.837 (SE = 0.120) for females and L∞ = 56.25 cm (SE = 2.662), K = 0.084 (SE = 0.067) and t0 = ?2.920 (SE = 0.117) for males. The overall sex ratio was 1.22 : 1 in favour of males. Total mortality, corresponding to the slope of the descending limb of the catch curve, was Z = 0.81 per year for females and Z = 0.85 per year for males. Exploitation ratios were E = 0.68 for females and E = 0.73 for males. 相似文献
8.
9.
Background
The agriculturally important pasture grass tall fescue (Festuca arundinacea Schreb. syn. Lolium arundinaceum (Schreb.) Darbysh.) is an outbreeding allohexaploid, that may be more accurately described as a species complex consisting of three major (Continental, Mediterranean and rhizomatous) morphotypes. Observation of hybrid infertility in some crossing combinations between morphotypes suggests the possibility of independent origins from different diploid progenitors. This study aims to clarify the evolutionary relationships between each tall fescue morphotype through phylogenetic analysis using two low-copy nuclear genes (encoding plastid acetyl-CoA carboxylase [Acc1] and centroradialis [CEN]), the nuclear ribosomal DNA internal transcribed spacer (rDNA ITS) and the chloroplast DNA (cpDNA) genome-located matK gene. Other taxa within the closely related Lolium-Festuca species complex were also included in the study, to increase understanding of evolutionary processes in a taxonomic group characterised by multiple inter-specific hybridisation events. 相似文献10.
Melanie L Hand Noel OI Cogan Timothy I Sawbridge German C Spangenberg John W Forster 《BMC plant biology》2010,10(1):94