GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Walter de Gruyter GmbH  (9)
  • Biology  (9)
  • 1
    Online Resource
    Online Resource
    Isolation of n-Triacontane, Aliphatic Alcohols and Sitosterols from Convolvulus Microphyllus Sieb
    Walter de Gruyter GmbH ; 1978
    In:  Zeitschrift für Naturforschung B Vol. 33, No. 2 ( 1978-2-1), p. 249-249
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 33, No. 2 ( 1978-2-1), p. 249-249
    Abstract: From the petroleum ether extract of Convolvulus microphyllus n-triacontane, a mixture of higher aliphatic primary alcohols -n-hexa-cosanol, n-octacosanol, n-triacontanol and n-dotriacontanol, β-and ε-sitosterols were obtained and characterised by IR, NMR and mass spectral studies and normal methods
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1978-0231
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1978
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Mechanism of Hg(II) Oxidation of D-Galactose in Alkaline Medium
    Walter de Gruyter GmbH ; 1978
    In:  Zeitschrift für Naturforschung B Vol. 33, No. 6 ( 1978-6-1), p. 657-659
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 33, No. 6 ( 1978-6-1), p. 657-659
    Abstract: The present paper deals with the kinetics of oxidation of D-galactose by Nessler's reagent in alkaline medium. The reaction is zero order with respect to Hg(II) and first order with respect to reducing sugar. The direct proportionality of the reaction rate at low hydroxide ion concentrations shows retarding trend at higher concentrations. The reaction rate is inversely proportional to iodide ion concentration. A mechanism has been proposed taking HgI 3 - as the reacting species
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1978-0619
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1978
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Radical Scavenging and Radiomodulatory Effects of Psoralea corylifolia Linn. Substantiated by in vitro Assays and EPR Spectroscopy
    Walter de Gruyter GmbH ; 2011
    In:  Zeitschrift für Naturforschung C Vol. 66, No. 1-2 ( 2011-2-1), p. 35-46
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 66, No. 1-2 ( 2011-2-1), p. 35-46
    Abstract: The present study is the first report of the radiomodulatory effects of Psoralea corylifolia Linn. The extract (IBG-RA-26) prepared from P. corylifolia was chemically analysed by HPLC, LC-MS/MS and NMR. The total polyphenolic content of IBG-RA-26 was 0.287 mg/ ml of quercetin equivalents. IBG-RA-26 exhibited a dose-dependent increase in 2,2-diphenyl- 1-picrylhydrazyl (DPPH) radical scavenging activity. It exhibited comparable ( 〉 50%) site-specific and non-site-specific hydroxyl radical scavenging activity in higher concentration ranges (500 - 1000 μg/ml), while at lower concentrations (5 - 50 μg/ml) it exhibited significantly (p 〈 0.05) higher non-site-specific scavenging ability compared to site-specific activity. Nitric oxide scavenging activity of IBG-RA-26 (5 - 1000 μg/ml) increased in a concentrationdependent manner, while maximum superoxide ion scavenging ability (79%) was observed at 50 μg/ml. The electron donation potential of IBG-RA-26 was found to be higher than that of ascorbic acid at lower concentrations (up to 5 μg/ml). Analysis of the ability of IBGRA- 26 to protect membranes against γ-radiation, utilizing an artificial membrane system (liposome), revealed a significant (p 〈 0.05) decrease in the formation of malondialdehyde (MDA) as a function of the concentration of IBG-RA-26. Radiation-induced lysis of human erythrocytes was monitored and efficacy of IBG-RA-26 was tested in the concentration range 25 - 1000 μg/ml, with significant protective efficacy observed in the range 25 - 50 μg/ml. IBG-RA-26 rendered significant (p 〈 0.05) protection against radiation (0.25 kGy)-induced DNA damage. EPR spectroscopy was used to investigate the DPPH radical scavenging capacity of IBG-RA-26. IBG-RA-26 exhibited a good DPPH radical scavenging capacity in a concentration-dependent manner. By direct EPR spectroscopy we have also demonstrated the possible formation of free radical species in a solution of IBG-RA-26. The wide spectrum of radioprotective and antioxidant properties exhibited by IBG-RA-26 indicate that P. corylifolia has potential as a radiomodulatory agent.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-2011-1-206
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2011
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Studies in Enteric Anthelmintics: Activity Profile of Prodrug of a Bisbenzimidazole
    Walter de Gruyter GmbH ; 1991
    In:  Zeitschrift für Naturforschung C Vol. 46, No. 7-8 ( 1991-8-1), p. 673-677
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 46, No. 7-8 ( 1991-8-1), p. 673-677
    Abstract: The comparative anthelmintic activity of a possible prodrug, 2,2′-dicarbomethoxyamino-5,5′-dibenzimidazolyl methanol (2) with its parent compound 2,2′-dicarbomethoxyamino-5,5′-dibenzimidazolyl ketone (1) and the reference drug mebendazole (3 a) is reported. At a dose of 25 mg/kg, compound 2 was 100% effective against Ancylostoma ceylanicum in hamsters. Compound 2 also exhibited a similar order of activity against Syphacia obvelata, Hymenolepis nana and H. diminuta at a dose of 100 mg/kg. The drug exhibited lethal effects against metamorphic forms of A. ceylanicum at a dose of 100 mg/kg. However the trichostrongylids, Nippostrongylus brasiliensis remained unaffected up to a dose of 250 mg/kg of 2. Both 1 and 3 a exhibited inferior activity than 2 except against adult A. ceylanicum. The activity of 1 and 2 has been explained on the basis of their ability to resist systemic hydrolysis resulting in higher concentration of the active drug in biophase.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-1991-7-826
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1991
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Chemical Composition and Phytotoxicity of Volatile Essential Oil from Intact and Fallen Leaves of Eucalyptus citriodora
    Walter de Gruyter GmbH ; 2006
    In:  Zeitschrift für Naturforschung C Vol. 61, No. 7-8 ( 2006-8-1), p. 465-471
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 61, No. 7-8 ( 2006-8-1), p. 465-471
    Abstract: A total of 23 volatile constituents was identified and characterized by GC and GC-MS in the volatile essential oil extracted from intact (juvenile and adult) and fallen (senescent and leaf litter) leaves of lemon-scented eucalyptus (Eucalyptus citriodora Hook.). The leaves differed in their pigment, water and protein content, and C/N ratio. The oils were, in general, monoterpenoid in nature with 18 monoterpenes and 5 sesquiterpenes. However, a great variability in the amount of essential oils and their individual constituents was observed in different leaf tissues. The amount was maximum in the senescent leaves collected from the floor of the tree closely followed by that from juvenile leaves. In all, 19 constituents were identified in oil from juvenile and senescent leaves compared to 23 in adult leaves and 20 in leaf litter, respectively. Citronellal, a characteristic monoterpene of the oil reported hitherto was found to be more (77D78%) in the juvenile and senescent leaves compared to 48 and 54%, respectively, in the adult leaves and leaf litter. In the adult leaves, however, the content of citronellol - another important monoterpene - was very high (21.9%) compared to other leaf types (7.8-12.2%). Essential oil and its two major monoterpenes viz. citronellal and citronellol were tested for their phytotoxicity against two weeds (Amaranthus viridis and Echinochloa crus-galli) and two crops (Triticum aestivum and Oryza sativa) under laboratory conditions. A difference in the phytotoxicity, measured in terms of seedling length and dry weight, of oil from different leaves and major monoterpenes was observed. Oil from adult leaves was found to be most phytotoxic although it occurs in smaller amount (on unit weight basis). The different toxicity of different oil types was due to the relative amount of individual monoterpenes present in the oil, their solubility and interactive action. The study concludes that oil from senescent and juvenile leaves being rich in citronellal could be used as commercial source of citronellal whereas that from adult leaves for weed management programmes as it was the most phytotoxic.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-2006-7-801
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2006
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Chemotherapy of Filariasis -On the Search of New Agents Effective on the Reproductive System of Female Adult Worms
    Walter de Gruyter GmbH ; 1990
    In:  Zeitschrift für Naturforschung C Vol. 45, No. 11-12 ( 1990-12-1), p. 1210-1214
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 45, No. 11-12 ( 1990-12-1), p. 1210-1214
    Abstract: The design and synthesis of a series of alkyl 5(6)-substituted benzimidazole-2-carbamates (1-13), 7-chloro-4-(4-substituted phenyl)aminoquinolines (14-16), l,2-dim ethyl-3-m ethoxycarbonyl- 4,5-disubstituted pyrroles (17-19) and some compounds belonging to the class pimelonitrile (20), dihydroquinoline (21), pyridine (22), pyridoquinoline (23) and tetrahydropyrimidine (24) have been carried out as possible antifilarial agents. All these compounds have been evaluated for their activity against male and female adult worms of Litomosoides carinii in cotton rats. The effect of these compounds was also observed on the reproductive system (condition of developing microfilariae and their release from uterus) of adult female worms. In this study, three types of compounds were discovered: (a) those which showed activity on both the male and female adult worms and also had sterilizing effects on surviving adult females (1 -3 , 6 - 9 , 13, 19), (b) those which only sterilized the adult females (14-16 , 21, 24), and (c) those which had no effect on female reproduction but killed only adult worms (4, 5, 11, 12, 17,18, 20, 22, 23). This tends to open up a new avenue in the chemotherapy of filariasis and the future scope of work on chemosterilization of adult females has been discussed.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-1990-11-1221
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1990
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Citronellol Disrupts Membrane Integrity by Inducing Free Radical Generation
    Walter de Gruyter GmbH ; 2011
    In:  Zeitschrift für Naturforschung C Vol. 66 ( 2011), p. 0260-
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 66 ( 2011), p. 0260-
    Type of Medium: Online Resource
    ISSN: 0939-5075
    URL: Article
    DOI: 10.5560/ZNC.2011.66c0260
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2011
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Effect of 2-Benzoxazolinone (BOA) on Seedling Growth and Associated Biochemical Changes in Mung Bean (Phaseolus aureus)
    Walter de Gruyter GmbH ; 2006
    In:  Zeitschrift für Naturforschung C Vol. 61, No. 9-10 ( 2006-10-1), p. 709-714
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 61, No. 9-10 ( 2006-10-1), p. 709-714
    Abstract: BOA (2-benzoxazolinone) is a potent phytotoxin present in several graminaceous crops such as rye, maize and wheat. Due to its wide range of phytotoxicity, it is considered as a potential pesticide. A study was conducted to explore the impact of BOA on the radicle and plumule elongation of mung bean (Phaseolus aureus) and associated changes in the macromolecular content - proteins and carbohydrates - and activities of enzymes like amylases, proteases, polyphenol oxidases and peroxidases. BOA significantly reduced the radicle and plumule length of P. aureus, and the contents of proteins and carbohydrates in both root and leaf tissue. On the other hand, activities of hydrolytic enzymes - proteases, amylases, polyphenol oxidases and peroxidases - increased substantially in both root and leaf tissue of P. aureus upon BOA exposure. This indicated that BOA treatment induced stress in P. aureus and enhanced enzyme activities to counter the induced stress and continue the growth. In other words, BOA-induced stress altered the plant biochemical status and related enzyme activities resulting in increased metabolism that serves to provide protection against cellular injury. Such studies providing information about the biomolecular content and enzymatic activities in response to natural products serve as clues for furtherance of knowledge about the modes of action of natural compounds of commercial interest.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-2006-9-1017
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2006
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Bis(η 5 -cyclopentacüenyl)N,N-Disiibstituted Dithiocarbamato(chloro)oxomolybdeniim(VI) Complexes
    Walter de Gruyter GmbH ; 1980
    In:  Zeitschrift für Naturforschung B Vol. 35, No. 10 ( 1980-10-1), p. 1254-1256
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 35, No. 10 ( 1980-10-1), p. 1254-1256
    Abstract: Bis(η 5 -cyclopentadienyl)N,N-disubstituted dithiocarbamato(chloro)oxomolybdenum(VI) complexes of the type (C 5 H 5 ) 2 MoO(S 2 CNR 2 )Cl and (C 5 H 5 ) 2 MoO(S 2 CNRR′)Cl where R = Me, Et, i-Pr and R′ = cyclohexyl (cyhx) have been prepared by the reaction of stoichio­metric amounts of bis(η 5 -cyclopentadienyl)oxomolybderium(VI) dichloride with sodium dithiocarbamates in refluxing dichloromethane. Infrared spectral studies demonstrate that in these complexes, the dithiocarbamate ligands are bidentate. Hence a coordination number of 7 may be assigned to the molybdenum(VI) atom in each case. In addition to infrared studies, electronic spectra, NMR studies, magnetic susceptibility, elemental an­alyses and conductance measurements have been carried out for these complexes.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1980-1016
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1980
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...