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Showing papers by "North Eastern Hill University published in 1994"


Journal Article
TL;DR: During tumor regression, ascites fluid volume decreases sharply and there is an increase in carbohydrates and decrease in protein contents in the ascites supernatant after cisplatin treatment in vivo.
Abstract: Cisplatin treatment brings about complete regression of ascites Dalton's lymphoma in mice. In the present study various steps involved during the tumor regression are examined using some biochemical and morphological parameters. During tumor regression, ascites fluid volume decreases sharply and there is an increase in carbohydrates and decrease in protein contents in the ascites supernatant after cisplatin treatment in vivo. Cisplatin treatment brings about definite changes in the arrangement/movement of surface membrane ruffles/blebs of tumor cells and causes infiltration of leukocytes (neutrophils, monocytes, lymphocytes) towards tumor cells. Membrane vesicles and vacuoles are also formed before the disintegration and lysis of tumor cells.

117 citations


Journal ArticleDOI
TL;DR: Accumulated ammonia induced the activity of the enzymes of the ornithine-urea cycle for its metabolic conversion to urea to help the freshwater fish to avoid toxaemia and to tolerate high concentrations of ammonia in the ambient medium.
Abstract: An ammoniotelic freshwater teleost, Heteropneustes fossilis , tolerated ambient ammonium chloride concentration up to 75 mM. Ammonia accumulated significantly in all the tissues within 7 days of treatment and the concentration remained high throughout the 4-week period of treatment. The activity of enzymes of the ornithine-urea (o-u) cycle were induced within 7 days, and thereafter remained high in both the liver and kidney of the fish. Urea accumulated significantly in various tissues simultaneous with the induction of o-u cycle enzymes. Accumulated ammonia induced the activity of the enzymes of the o-u cycle for its metabolic conversion to urea. This helped the freshwater fish to avoid toxaemia and to tolerate high concentrations of ammonia in the ambient medium.

57 citations


Journal ArticleDOI
TL;DR: In this article, Schleid et al. showed that the sulphur affinity hypothesis cannot explain variabilities in toxicities of test metals in A. pinnata and A. polyrhiza.

35 citations


Journal ArticleDOI
TL;DR: The biomass of filamentous green algae was enhanced by phosphorus enrichment particularly at low flow and in the pool, and the stimulatory effect of nutrient enrichment was inversely related to current velocity.

32 citations


Journal ArticleDOI
TL;DR: In this article, 1-Aryl-2-phenyl-(methylthio) -4-dimethylamino-1, 3-butadienes 1 gave different pyrimidones with different haloketenes (chloro, bromo and iodo).

31 citations


Journal ArticleDOI
TL;DR: A comparison with the numerical solution for the neutralino masses shows that these formulas serve as an excellent approximation for almost the entire phenomenologically interesting range of parameters.
Abstract: We derive a number of approximate analytical formulas for the neutralino masses and neutralino states in the nominimal supersymmetric standard model containing a Higgs singlet in addition to the two Higgs doublets of the minimal model. A comparison with the numerical solution for the neutralino masses shows that these formulas serve as an excellent approximation for almost the entire phenomenologically interesting range of parameters.

25 citations


Journal ArticleDOI
TL;DR: Seasonal change in the epilithic community was mainly regulated by fluctuations in flow rate, and diatoms were the most resistant forms during rapid runoff.
Abstract: The seasonal dynamics of epilithic algae in a third order pristine forest stream were analyzed over a period of 2 years. Stream water was slightly acidic and nutrient poor. Encrusting, filamentous flocs, and filaments were found. Algal standing crop was high (mean concentration of Chl a 16–43 mg m−2) in spring. Filamentous algae contributed most to standing crop. Diatoms made up over 85% by number of the epilithon. Blue-greens were abundant upstream, and chlorophytes downstream. This shift was ascribed to greater light availability downstream. The community was more diverse during spring. Water current was the most important variable regulating epilithon structure. Total phosphorus (TP), orthophosphate (O-POinf4su3–), silica (Si4+), nitrate (NOinf3su–) and conductance correlated negatively with flow rate. Green algae showed a positive correlation to phosphorus during low and stable flow. During rapid runoff, diatoms were the most resistant forms. Seasonal change in the epilithic community was mainly regulated by fluctuations in flow rate.

20 citations


Journal ArticleDOI
TL;DR: In this paper, the α-oxoketene dithioacetals of general formula 1 (Scheme 2), undergo regioselective 1,2-addition with allyl anions to afford the corresponding carbinol acetals 6 in quantitative yields, which on treatment with BF3.Et2O in refluxing benzene yield the corresponding aromatic systems.
Abstract: The α-oxoketene dithioacetals of general formula 1 (Scheme 2), undergo regioselective 1,2-addition with allyl anions to afford the corresponding carbinol acetals 6 in quantitative yields, which on treatment with BF3.Et2O in refluxing benzene yield the corresponding aromatic systems. The method has been shown to be widely applicable as exemplified by a large number of allyl anions (Scheme 3) reacting with α-oxoketene dithioacetals with wide structural variation. However, when 1 carry the α-substituent the intermediate carbinol acetals 14 (Scheme 4) follow, different path to yield the corresponding indenes 15 in good yields. The cinnamoylketene dithioacetals 16 react with allyl anions to afford the corresponding methylthiostilbenes 18 (Scheme 5), while the homologous dithioacetal 20 failed to yield the corresponding 1,4-biaryl-1,3-diene 22 (Scheme 6). This limitation was circumvented by reacting 23 with allyl anions to afford the corresponding stilbenes 24, dienes 25 and triene 26 respectively. The...

17 citations


Journal ArticleDOI
TL;DR: In this article, single crystals of triglycine sulphate doped with different concentrations of alanine were studied by Raman spectroscopy, and bands due to the subspecies modes from the three crystallographically distinct glycine ions in the lattice were identified.

17 citations


Journal ArticleDOI
TL;DR: In this article, the neutralino mass matrix in the minimal extension of the minimal supersymmetric standard model is studied and several useful approximation formulas are obtained based on these analytical results.
Abstract: We study in detail the neutralino mass matrix in the minimal extension of the minimal supersymmetric Standard Model. The model contains a Higgs singlet besides the two Higgs doublets of the minimal model. A number of limiting cases are considered wherein the neutralino mass spectrum can be analytically obtained. Based on these analytical results several useful approximation formulas for the neutralino masses are obtained. Using the constraints from the renormalization group analysis of the model, we obtain the spectrum numerically and study the dependence of the neutralino masses on the parameters of the model. We compare the results of the approximation formulas with the numerical results, and thereby establish the applicability of the these formulae in the different regions of the parameter space.

15 citations


Journal ArticleDOI
TL;DR: Cell suspension cultures established from young, expanding, juvenile leaves of a mature Thevetia peruviana L. tree retained embryogenic potential for almost 2 years and a large number of somatic embryos produced.
Abstract: Cell suspension cultures, which retained embryogenic potential for almost 2 years, were established from young, expanding, juvenile leaves of a mature Thevetia peruviana L. tree. Calli were obtained by culturing young leaf discs on MS medium supplemented with 2 mg/L 2, 4-dichlorophenoxyacetic acid (2, 4-D) and 0.1 mg/L kinetin. Suspension cultures were initiated by transfer of calli to liquid medium containing 1 mg/L 2,4-D + 0.1 mg/L kinetin, and the cultures were maintained by subculturing to fresh medium at 2 week intervals. Embryogenic frequency of cell aggregates was more than 80% when plated on semi-solid medium containing 0.1 mg/L 2, 4-D and 2 mg/L 2-isopentenyladenine (2-iP). Cell aggregates with developing embryos were transferred to fresh medium lacking growth regulators for embryo maturation. Early embryo development was synchronous and a large number of somatic embryos were produced. These somatic embryos developed into plantlets upon subsequent transfer to modified half-strength MS medium. More than 200 green and rooted plants, at an average of 80 plants per 100 mg of embryogenic callus, were obtained with 60% survival under glass house conditions.

Journal ArticleDOI
TL;DR: In this paper, the acyclic and cyclic β-hydroxydithioacetals 3a-m and 4a-b obtained by sodium borohydride reduction (or Grignard addition) of the corresponding β -oxodithionacetals 2a-,m, and 2b,m are shown to undergo facile one pot thermal dehydration and dethioacetalization in the presence of dimethyl sulphoxide to afford the corresponding ene- and polyene aldehydes 5a-, m, and 6a-, b,

Journal ArticleDOI
01 Sep 1994-Talanta
TL;DR: A new sensitive, rapid and selective method is proposed for the determination of mercury in submicrogram level using derivative spectrophotometry to achieve selectivity.

Journal ArticleDOI
TL;DR: It is concluded that higher receptor binding and cytotoxicity may be due to the retention of positive charge on the lysine residues of oLH which was preserved during the conjugation process.
Abstract: Since the positive charge on the lysine residues plays an important role in the receptor recognition ability of oLH, the hormonotoxin has been synthesised with the use of 2-iminothiolane HC1 (2IT) and N-Succinimidyl-3-(2-pyridyldithio)-propionate (SPDP). The oLH activated with 2IT (oLH-10) was then mixed with SPDP activated gelonin (gelonin-30) in order to obtain a oLH-S-S-gelonin hormonotoxin. The conjugation mixture containing hormonotoxin was purified by gel-filtration chromatography according to the molecular weight and a complete physico-chemical, immunochemical and biochemical analysis were performed. The linkage occured through the e-NH2 groups of α-subunit of oLH as judged from RP-HPLC analysis. A 1∶1 (oLH:gelonin) molar ratio was obtained when determined with the use of several techniques. The hormonotoxins retained substantial receptor binding, steroidogenic activity and immunoreactivity. The competitive displacement analysis indicate that the binding occurs via the hormone part leaving the gelonin free which was probed with the gelonin antibodies. The presently described (C150A-02, C160A-02 and C170A-02) hormonotoxins exhibited higher receptor binding and toxicity to the target cells than the hormonotoxins prepared with the use of SPDP only. Therefore it is concluded that higher receptor binding and cytotoxicity may be due to the retention of positive charge on the lysine residues of oLH which was preserved during the conjugation process.

Journal ArticleDOI
TL;DR: The cyclopropyl carbinols obtained by either borohydride reduction (or Grignard addition) of the cycloprocessyl ketones 1 are shown to undergo acid induced ring opening and intramolecular cyclization (5-exo or 6-endo) or deprotonation to afford either cyclopentene, biphenyl or conjugated polyene derivatives depending on the nature of Lewis acid, reaction conditions and the structural features present in the carbinol as mentioned in this paper.

Journal ArticleDOI
TL;DR: Results indicate that daily injections of triazolam can stimulate neuroendocrine-gonadal activity by altering the phase-relationship between the cycle and the circadian clock involved in photoperiodic time measurement, and that agents which can affect the clock may be useful in altering seasonal cycles.
Abstract: The ability of mammals to measure seasonal changes in daylength depends upon a circadian clock and the phase-relationship between this clock and the light: dark cycle. Recently, a number of pharmacological and nonpharmacological stimuli have been shown to have pronounced effects on the phase of the circadian clock of rodents. The objective of the present study was to determine if a drug-induced change in the phase-relationship between a measurable circadian rhythm (i.e., wheel running behavior) and the light:dark cycle would alter the effects of the light cycle on the neuroendocrine-gonadal axis. Adult male hamsters with regressed testes due to exposure to an inhibitory 10:14-hr light:dark cycle were daily injected with vehicle or the short-acting benzodiazepine, triazolam, while remaining on short days, while a control group of hamsters was transferred to a photostimulatory 14:10-hr light:dark cycle. Two other groups of hamsters with regressed testes were blinded and daily injected with vehicle or triazolam. The injections were timed to occur about 4 hr before activity onset because previous studies had demonstrated that injections of triazolam at this time can lead to a phase advance in the activity rhythm. The circadian rhythm of wheel running behavior was measured in all the animals maintained on the 10:14-hr light:dark cycle in order to monitor circadian phase. While no testicular growth was observed after 25 days of vehicle injections, growth was observed in the triazolam-treated animals that was comparable to that observed in control animals transferred to long days. Testicular growth in triazolam-treated animals was associated with an earlier onset of locomotor activity, when compared with the vehicle-treated animals. Importantly, triazolam had no effect on the testicular size of blind animals. These results indicate that daily injections of triazolam can stimulate neuroendocrine-gonadal activity by altering the phase-relationship between the cycle and the circadian clock involved in photoperiodic time measurement, and that agents which can affect the clock may be useful in altering seasonal cycles.

Journal ArticleDOI
TL;DR: The metamorphosing tadpole presents an equally interesting study as it could recapitulate the events which occurred during the evolution of hearing in vertebrates at the lime of the transition from aquatic to terrestrial life.
Abstract: Amphibians, specially anurans, are excellent model systems for studying acoustic communication. After hatching, anurans exist in two forms; these have two distinct mode of sound perception. Aquatic larvae are perceptive to waterborne sound stimuli; then, following metamorphosis, as terrestrial adults, perceptive to airborne sound stimuli. Added to this, the metamorphosing tadpole presents an equally interesting study as it could recapitulate the events which occurred during the evolution of hearing in vertebrates at the lime of the transition from aquatic to terrestrial life. Metamorphosis entails the loss of a prominent aquatic sensory system—the lateral line system—and the simultaneous gain of another, the inner ear, along with the coevolution of the tympanic middle ear, a basilar papilla and a periotic labyrinth in the inner ear. Another interesting feature is that anurans are believed to be the first terrestrial vertebrates to use vocalization as a part of their reproductive behaviour. Vocal communication plays an important role in behaviour, ranging from territorial defense to reproduction, and calls are classified according to the particular behaviors that they subserve. Adult male anurans produce a species-specific mating call which is used to attract conspecific females dung their mating season, and this call serves as a mechanism in maintaining reproductive isolation from other sympatric species.

Journal ArticleDOI
TL;DR: In this article, a coordination complex of 5-(arylazo)salicylaldehyde with triphenyltin chloride has been shown to adopt a cis-trigonal bipyramidal geometry around tin.

Book ChapterDOI
TL;DR: The results suggest the existence of two different mechanisms; a fast one (F) and a slow one (S), which may depend on the exposure time and conditions, and by which taurine uptake could be modulated.
Abstract: Uptake of taurine by different tissues or cell types has been extensively studied these last decades (8,10,20). The high affinity taurine uptake displayed by the majority of the cells studied is a Na+, Cl− dependent system. Various hormones, drugs, and amino acids have been shown to affect this uptake. These compounds have been very often tested in vitro on cells in culture. However, they were usually tested by addition to the incubation media used for testing the taurine uptake. Some of these incubation media contain HEPES (N,N’hydroxyethylpiperazineethane sulfonate), which shows structural similarities with taurine (2-aminoethane sulfonate). We have previously shown that HEPES inhibits the taurine uptake of rat glial cells in primary cultures. This occurs by two mechanisms (11,12). A fast inhibition (within a few minutes) is observed when a Krebs-Ringer buffer supplemented with HEPES is used for the incubation of cells during taurine uptake determinations. On the contrary, when the glial cells are grown for a few days in a culture medium buffered with HEPES, instead of the more normal Na+ bicarbonate system, an inhibition of the taurine uptake is observed when cells are tested in the Krebs-Ringer incubation medium (11). This inhibition increases slowly with the culture length in the presence of HEPES (11). These results suggest the existence of two different mechanisms; a fast one (F) and a slow one (S), which may depend on the exposure time and conditions, and by which taurine uptake could be modulated. Different taurine analogs such as guanidinoethane sulfonate β-alanine, or hypotaurine are generally used to characterize the uptake of taurine by cultured cells by addition to the incubation media used for taurine uptake measurements. We have compared the effects obtained for these compounds on the taurine uptake upon addition to either the culture media (S condition) or the incubation media (F condition).

Journal ArticleDOI
TL;DR: In this article, the existence of a maximum in the electronic stopping power when an energetic ion reaches some depth in a solid target is well known, and experiments were described in which lithium ions were used to bombard the common polymer and particle dosimeter CR-39, so that the position of the stopping power peak relative to the polymer surface could be systematically varied.
Abstract: The existence of a maximum in the electronic stopping power when an energetic ion reaches some depth in a solid target is well known. Experiments are described in which lithium ions — in the energy range 0.6 to 3 MeV — were used to bombard the common polymer and particle dosimeter CR-39, so that the position of the stopping power peak relative to the polymer surface could be systematically varied. Differences in etched surface track diameters measured by optical microscopy and corresponding to differences in energy ∼ 0.2 MeV could be readily distinguished. Maximum etched track diameters clearly coincided with the intersection of maximum electronic energy losses with the CR-39 surface. Implications of this to more general stopping are discussed, including a linear relationship between the maximum electronic stopping power at a surface and the atomic number of the projectile ion.

Journal ArticleDOI
TL;DR: In this paper, the synthesis and characterization of bischelated silver(I) complexes of L(1) (L = 2-arylpyridinecar☐aldimine), [AgL2]ClO4 is reported.

Journal ArticleDOI
TL;DR: The promutagenic O6-guanine and O4-thymine sites are clearly distinguished from the nonmutagenic N7-guAnine site on the basis of calculated values of mechanistic indicators for Watson-Crick proton acidity following alkylation at these respective sites.
Abstract: Loss of Watson-Crick protons following DNA base alkylation has been proposed as a key event which confers mutation-inducing properties on to alkylated DNA bases. In this theoretical study, the promutagenic O6-guanine and O4-thymine sites are clearly distinguished from the nonmutagenic N7-guanine site on the basis of calculated values of mechanistic indicators for Watson-Crick proton acidity following alkylation at these respective sites. The degree of acidity predicted for these protons for each type of alkylated base accords well with the presence or absence of mutagenicity observed experimentally in each case.

Journal ArticleDOI
TL;DR: In this paper, a six-parameter optical-model analysis of the elastic-scattering data has been carried out using Woods-Saxon, and Woods Saxon-squared radial dependences.
Abstract: Differential cross-sections for elastic and inelastic scattering of 45 and 50 MeV alpha-particles from46Ti have been measured in the angular range from θlab5° to 135° in 2.5° and 5° steps and those of 40 and 45 MeV alpha-particles from48Ti in the angular ranges from θlab20° to 125° and 5° to 130°, respectively, in the same angular steps. A six-parameter optical-model analysis of the elastic-scattering data has been carried out using Woods-Saxon, and Woods-Saxon-squared radial dependences. A method based on predicting optical-model potential parameters starting with a consistent set of parameters at higher energies following the energy dependences established from the systematics has also been used. The most sensitive region of the potential in predicting the elastic-scattering cross-sections has been found by using a notch perturbation test. The problem of discrete family ambiguity in the optical-model analysis of elastic data has also been investigated. The inelastic-scattering data have been analysed in terms of the collective model using the distorted-wave Born approximation (DWBA), where the distorted waves are generated by the optical potential obtained from the elastic-scattering data. The values of the deformation parameter (β 2) thus obtained compare very well with the ones reported earlier.

Journal Article
TL;DR: A review of the geology and controls of uranium mineralisation in the Singhbhum Shear Zone between Narwapahar (Lat. 22deg44'N; Long. 86deg15'E) in the west, to Ghatsila (Lat., 22deg25'N, Long., 86deg20'E), up to Dalmas in the north is presented in this paper.
Abstract: A review of the geology and controls of uranium mineralisation in the Singhbhum Shear Zone between Narwapahar (Lat. 22deg44'N; Long. 86deg15'E) in the west, to Ghatsila (Lat. 22deg25'N; Long. 86deg20'E) in the southeast and up to Dalmas in the north is presented in the light of new data based on facies analysis and palaeo-current studies on the conglomerate and associated meta-sediments in the area. Synthesis and integration of geologic data have led to the following conclusions: (a) The facies variation and its distribution pattern in the area demonstrate fluviatile conditions of deposition with upward fining and thinning sequences (b) The sedimentary sequence shows progressive younging towards north without any obvious break or juxta-position of the older over the younger. (c) The nature of Jaduguda sedimentary facies assemblage is indicative of a fluvial fan with conglomerate gray-wacke-arenite assemblage representing proximal fan facies. On the basis of facies model, the area north of Subarnarekha river represents a meandering fluvial pattern. (d) Uranium mineralisation is distinctly stratabound with characteristic facies association. (author). 13 refs., 11 figs., 3 tabs.

Journal ArticleDOI
TL;DR: The anticlinal division of fusiform initials were predominantly pseudotransverse although a few radial divisions in Dalbergia and lateral (or tangential) divisions in Albizzia were noticed.
Abstract: Seasonal pattern of cell division in a year in four deciduous (Albizzia lebbeck, Dalbergia sissoo, Tectona grandis and Terminalia crenulata) and three evergreen (Calophyllum inophyllum, Mangifera indica and Morinda tinctoria) plants is described in detail. The anticlinal division of fusiform initials were predominantly pseudotransverse although a few radial divisions in Dalbergia and lateral (or tangential) divisions in Albizzia were noticed. There was often a difference in the orientation of the anticlinal division spindles even in the adjacent fusiform initials in the different plants. The timing of both the periclinal and anticlinal and initial location of division were studied and recorded for all plants studied.

Journal ArticleDOI
TL;DR: The uptake of nitrate by seedlings of common buckwheat ( Fagopyrum esculentum ) increased gradually with time ( t ) and with increasing medium nitrate concentration ( c ) up to t 60 minutes and c 1mM, respectively as discussed by the authors.

Journal ArticleDOI
TL;DR: Change in the viable seed populations of three weed species, Galinsoga ciliata (Rafin) Blake, Polygonum alatum Buch.
Abstract: Summary: Resume: Zusammenfassung Change in the viable seed populations of three weed species, Galinsoga ciliata (Rafin) Blake, Polygonum alatum Buch Ham and Spergula arvensis L in soil was studied in potato, radish, cabbage and cabbage+radish (mixed to gether) fields under shifting agriculture (locally called jhum) and terrace cultivation in northeast India from October 1988 to September 1989 The effect of weeding frequency on the viable weed seed populations of these weeds was also investigated In most fields seed populations were smaller during the rainy season than during other seasons Initially, the viable seed populations of all three weed species showed a significant (P<005) decrease with increasing soil depth in all crop fields under jhum cultivation However, there was no clear trend in the terraced fields At the end of the study period the trend was not clear in all crop fields under either jhum or terrace cultivations In the ‘normally weeded plots’ the viable seed populations of S arvensis and P alatum recorded about a 2% increase in jhum fields, while in the terraced fields they showed a loss of 4% over the 1-year period The ‘frequently weeded plots’ however, showed a sharp decline in viable seed populations in all crop fields Dynamique des populations des graines de mauvaises herbes enfouies: influence de l'agriculture itinerante et de la culture en terrasses dans les zones humides sub-tropicales de l'Inde Les changements dans les populations de graines viables de trois especes de mauvaises herbes, Galinsoga ciliata (Rafin) Blake, Polygonum alatum Buch Ham et Spergula arvensis L, ont eteetudies dans des champs de pomme de terre, de radis, de chou et de chou et radis (en melange) dans des conditions d'agriculture itinerante (appelee localement jhum) et d'agriculture en terrasses dans le nord-est de l'Inde, d'octobre 1988 a septembre 1989 L'effet de la frequence de desherbage sur les populations de graines viables de ces mauvaises herbes a aussi eteetudie Dans la plupart des champs, les populations de graines etaient plus reduites pendant la saison des pluies que pendant les autres saisons Au debut de l'etude, les populations de graines viables des trois especes de mauvaises herbes montraient dans toutes les cultures jhum une decroissance significative (P<005) avec la profondeur dans le sol Par contre, il n'y avait pas de relation claire dans les champs en terrasses A la fin de l'etude, la tendance n'etait claire dans aucun des champs, qu'il soient en culture jhum ou en terrasses Sur la periode d'un an qu'a dure l'etude, et dans les parcelles ‘normalement desherbees’, les populations de graines viables de S arvensis et de P alatum ont augmente de 2% dans les champs jhum, alors que dans les champs en terrasses, elles ont chute de 4% Cependant, dans les parcelles frequemment desherbees, les populations de graines viables decroissaient rapidement dans tous les champs Populationsdynamik des Unkrautsamenvorrats im Boden unter dem Einflus von Rodungs- und Terrassen-Kulturen in humid subtropischen Gebieten Indiens Veranderungen der Samenpopulation der 3 Unkrautarten Galinsoga ciliata (Rafin) Blake, Polygonum alatum Buch Ham und Spergula arvensis L im Boden wurden in Kartoffeln, Rettich, Kohl und Mischbestanden von Kohl und Rettich bei wandernden Rodungskulturen (Jhum genannt) und Terrassenkulturen in Nordostindien zwischen Oktober 1988 und September 1989 untersucht Die Wirkung der Haufigkeit des Jatens auf die Populationen lebensfahiger Unkrautsamen wurde auch untersucht Auf den meisten Feldern waren die Samenpopulationen wahrend der Regenzeit kleiner als in der ubrigen Jahreszeit Anfanglich nahm die Samendichte aller 3 Unkrautarten mit zunehmender Bodentiefe in allen Jhum-Kulturen signifikant ab (P<005) In den Terrassenkulturen jedoch waren die Verhaltnisse nicht klar Zum Ende der Untersuchungsperiode war sowohl bei der Jhum- als auch der Terrassenkultur die Verteilung der Samen im Boden gleich Auf den Jhum-Feldern nahmen die Samenpopulationen von S arvensis und P alatum bei normalem Jaten um 2% zu wahrend sie bei der Terrassenkultur um 4% abnahmen Bei haufigem Jaten jedoch nahmen die Samenpopulationen in allen Kulturen sehr deutlich ab

Journal ArticleDOI
TL;DR: In this article, a number of mixed-fluoro complexes of UO22+ of the types A2[UO2(PO4)F(H2O)3]·3H 2O [A = K (1), Na (2) or NH4+ (3) was synthesized, and they were characterized by analyses, electrical conductance measurements and electronic, IR and laser Raman (IR) spectroscopic studies.

Journal ArticleDOI
TL;DR: Complex peroxouranates have been synthesized from the reaction of UO3·4H2O with AHF2 (A  NH4 or K) and hydrogen peroxide as discussed by the authors.

Journal ArticleDOI
TL;DR: The singularity-free solution of (4 + D) -dimensional Einstein field equations for the Kaluza-Klein cosmological model is obtained in this paper, where the Dirac equations are solved in this model.
Abstract: The singularity-free solution of (4 + D) -dimensional Einstein field equations for the Kaluza-Klein cosmological model is obtained. Then the Dirac equations are solved in this model.