Distribution pattern of rare earth elements in fern

All the lanthanide elements (REE) in fern (Matteuccia) and in soil were determined with inductively coupled plasma mass spectrometer (ICP-MS) in order to discuss REE behavior in fern. The fern sample was divided into three parts: root, stem, and leaf; the soil of the same site was also sampled and the soil sample was divided into two parts: HCl and HNO₃ soluble part (soil[HCl]) and HF soluble part (soil[HF]). REE in each part was determined by ICP-MS after solvent extraction separation. The overall variation of the REE pattern of the root does not resemble that of the whole soil, but that of the HF soluble part. A tetrad effect variation (W-type) was found in the REE patterns of root, stem and leaf; more conspicuous tetrad effect variation was observed in HREE region than in LREE region, and was so in stem and leaf than in root. Negative anomalies of Ce were observed in the REE patterns of root, stem and leaf, with bigger anomalies in stem and leaf than in root. The results of this study suggest that REE in fern has come from silicates of soil and has once been in dissolved state.     

The interrelationship of somatostatin and guanylate cyclase activity

Summary Somatostatin has been shown to inhibit the release of various polypeptide hormones including insulin, glucagon, gastrin, thyroid stimulating hormone, and growth hormone. The mechanism by which somatostatin inhibits the release of these various polypeptide hormones has not been fully eluciadated. It has been reported that somatostatin increases the level of the second messenger cyclic GMP in rat brain and in the anterior pituitary gland. The present investigation was designed to determine if these responses seen in the anterior pituitary gland and brain were due to activation of guanylate cyclase GTP-pyrophosphate lyase (cyclizing), E.C.4.6.1.2., the enzyme that catalyzes the formation of cyclic GMP. Somatostatin at a concentration of 2 pm enhanced guanylate cyclase activity two-fold in rat cerebrum and anterior pituitary gland. This enhancement of guanylate cyclase activity was also seen in rat liver, pancreas, stomach, and small intestine at the same concentration of somatostatin. Increasing the concentration of somatostatin to 20 m, caused a marked inhibition of guanylate cyclase activity in all these tissues. Dose-response curves done on gastric guanylate cyclase activity revealed that over a concentration range of 2 pm to 0.2 m, somatostatin had a stimulatory effect on guanylate cyclase activity while at concentrations above 10 m somatostatin was inhibitory to guanylate cyclase activity. The biphasic pattern of enhancement of guanylate cyclase activity at lower concentrations of somatostatin and inhibition at higher concentrations may help to explain some of the discrepancies seen with previous investigations with somatostatin, hormone release, and cyclic nucleotide metabolism.     

Impact of metal accumulation pattern on the annual rhythmicity of antioxidants and their interrelationship to maintain the oxidative balance in mollusc

A chronological relationship between the annual profiles of oxidative stress markers, the key regulator of stress physiology has been sought in a terrestrial mollusc (Nerita articulata) under natural photothermal conditions. The hemolymph samples were collected at two different times in each month (from January to December) and the same was repeated for two consecutive years throughout an annual cycle. The fluctuations in the concentrations of certain heavy and trace metals (zinc, copper, cadmium, mercury, lead, and nickel) in both soil and hemolymph of Nerita are also estimated accordingly. Therefore, the present study aims to explore the rhythmic responses of oxidative stress marker to assess the impact of different trace and heavy metals on selected mollusc species. We tries to develop a realistic conceptual idea to analyze and predict the effect of changing environmental pollution on the possible shift in the rhythmicity of aforesaid antioxidants in terrestrial mollusc and their adaptive responses to thrive in such environment. Our results indicates that the amplitude of circannual rhythms of all the selected stress markers varied accordingly but the pattern of annual fluctuation is noted to be similar, and correlated with the metal accumulation. Therefore current information might help to frame the adaptive strategies for invertebrate species under similar toxic circumstances.     

Anthropology and politics: The logic of their interrelationship

Conclusion The thesis of value neutrality is logically untenable and anthropologically naive. It is logically untenable because it does not attend to contextual (i.e. historical, sociological and political) meaning. It is anthropologically naive because it does not take into account that values are culturally mediated and historically situated, i.e. it assumes that values are the result of arbitrary choices. And, one must add, it is morally objectionable because it eliminates the notion of responsibility, though it pretends to defend it.Rather than attacking the thesis of value neutrality by following the more usual procedure of unmasking specific substantive theories, I have dismantled the logic of value neutrality itself by concentrating on the insurmountable formal contradictions of the fact-value dichotomy. In neglecting social, economic and cultural constraints, while stressing the freedom of the individual, the thesis of value neutrality emerges as liberal ideology. Whatever the liberating effect of decisionism may have been, it has de facto become the ideology of a scientific establishment which was conditioned to sell its services to the highest bidder. Decisionism has promoted a division of labor between those who determine the ends and those who supply the technical means without being concerned about their application . Thus it supports the status quo, and becomes a means of repression and exploitation .Decisionism is an inherent aspect of positivism . The subjectivity of ethics is the counterpart of the objectivity of science. Both are the result of a subjective idealism which takes the individual subject as point of departure. It is the individual subject who constructs his world on the basis of sensory impressions and his reason and who chooses his values. This implies not only the autonomy of ethics vis-à-vis science, but also an autonomy of facts vis-à-vis theory, and an autonomy of both science and ethics vis-à-vis history. This epistemological position is, therefore, elementaristic, individualistic and ahistorical.A radical alternative has to take as point of departure that cognition in its diverse manifestations (scientific and epistemological paradigms, logic, etc.) and value systems are interrelated historical products. It has to reject the compartmentalization of fact and value, fact and theory , subject and object, and it must place these relations in a truly dialectical perspective. Such a perspective does not provide us with unshakable moral and political precepts, but — since it does not take what is historically given for the eternally valid nor confound history with mere arbitrariness — it does point to the possibility and necessity of transformation and emancipation, i.e., the historically ly possible.Cornelis J.J. Vermeulen is Professor of Anthropology at the University of Amsterdam.

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Anthropology and politics: The logic of their interrelationship

Dialectical Anthropology - The thesis of value neutrality is logically untenable and anthropologically naive. It is logically untenable because it does not attend to contextual (i.e. historical,...     

The effect of thyroid hormone status on plasma glucose-insulin interrelationship in broiler chickens

The aim of the present experiments was to study the plasma glucose-insulin relationship in eu-, hypo- or hyperthyroid broiler chickens. None of the thyroid states modified the fasting plasma glucose and insulin levels. Hypothyroid chickens exhibited a normal glucose tolerance and a normal glucose-induced insulin release after oral glucose (2 g/kg body weight) administration compared to euthyroid chickens. In contrast, hyperthyroid chickens exhibited an improved glucose tolerance accompanied by a lower insulin release. Insulin injections at a concentration of 0.1 U/kg body weight was only hypoglycemic in hyperthyroid chickens, which confirms the observation that these chickens are more sensitive to insulin. From this study it can be suggested that alterations in body composition according to thyroid status are at least partly mediated by changes in the control of carbohydrate metabolism by pancreatic hormones.     

The interrelationship of growth and frost tolerance in winter rye

The reduction in growth of winter cereals that occurs in the fall is thought to be required for the development of frost resistance. In the present study, the interrelationship of freezing tolerance and growth was examined by raising winter rye ( Secale cereale cv. Puma) plants at 20/16°C (day/night) and at 5/3°C under 8-, 16- and 24-h daylengths to vary growth rates and frost tolerance. Temperature and irradiance were quantified as thermal time, photothermal time and photosynthetic photon flux and examined by multiple linear regression in order to determine their effects on growth and frost tolerance of rye shoots. At low temperature, both growth and frost tolerance were markedly influenced by daylength and irradiance. Plants grown at 5/3°C with a short daylength accumulated shoot dry weight and increased frost tolerance at a greater rate per unit photothermal time or photon flux than plants grown at longer daylengths. Moreover, 5/3°C plants grown with a 16-h day grew more slowly and were less frost tolerant than plants grown with a 24-h day. We conclude that the interrelationship between growth and frost tolerance is a quantitative one. Frost tolerance is induced only by low temperature, but the development of forst tolerance is dependent upon both irradiance, which affects the amount of photoassimilate available, and daylength, which may affect the partitioning of photoassimilates between growth and frost tolerance.     

Morphology-induced collective behaviors: dynamic pattern formation in water-floating elements

Complex systems involving many interacting elements often organize into patterns. Two types of pattern formation can be distinguished, static and dynamic. Static pattern formation means that the resulting structure constitutes a thermodynamic equilibrium whose pattern formation can be understood in terms of the minimization of free energy, while dynamic pattern formation indicates that the system is permanently dissipating energy and not in equilibrium. In this paper, we report experimental results showing that the morphology of elements plays a significant role in dynamic pattern formation. We prepared three different shapes of elements (circles, squares, and triangles) floating in a water-filled container, in which each of the shapes has two types: active elements that were capable of self-agitation with vibration motors, and passive elements that were mere floating tiles. The system was purely decentralized: that is, elements interacted locally, and subsequently elicited global patterns in a process called self-organized segregation. We showed that, according to the morphology of the selected elements, a different type of segregation occurs. Also, we quantitatively characterized both the local interaction regime and the resulting global behavior for each type of segregation by means of information theoretic quantities, and showed the difference for each case in detail, while offering speculation on the mechanism causing this phenomenon.     

Independent development of homologous pattern elements in the wing patterns of butterflies

Rank correlation analyses demonstrate that the degree of color pattern development in each wing cell of Cercyonis pegala (Satyridae) and Smyrna blomfildia (Nymphalidae) is either weakly or not at all correlated with that in other wing cells. There is much greater individual variability in pattern development in different wing cells than there is in homologous wing cells on opposite wings. This finding indicates that differences in pattern development in adjacent wing cells are not due to developmental noise, but are programmed, and that pattern development in each wing cell is in large measure independent of that in other wing cells.     

The interrelationship of meteorological factors,soil moisture and plant growth

A thorough review of literature pertaining to the role of soil moisture in the interrelationships between meteorological factors and plant growth has been presented. In arid and semi-arid areas crop yields are closely related to the supply of soil moisture during the growing season. Direct measurements of soil moisture are laborious, costly or sometimes unpracticable. Unless sufficiently replicated they do not represent the natural variations of moisture in the soil. Moisture budgets computed from standard climatological data to some extant satisfy the need for a time-space-integrating technique. Most budget methods make use of potential evapotranspiration as the maximum loss of water from soil and vegetation when water supply is non-limiting. Under dry-land conditions the rate of PE must be modulated to account for soil dryness, plant root system, soil characteristics and atmospheric conditions. Soil moisture estimates so obtained may be used to interpret variations in plant growth and crop yields, for crop zonation purposes,for agroclimatic classifications, as a basis for crop forecasts and so forth.

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Zusammenfassung In einer ausführlichen Übersicht wird der derzeitige Stand der Arbeiten über die Bedeutung der Bodenfeuchtigkeit in den Wechselbeziehungen zwischen meteorologischen Faktoren und Pflanzenwachstum berichtet. In ariden und semi-ariden Gebieten werden die Ernteerträge weitgehend bestimmt durch den Bodenfeuchtevorrat während der Wachstumszeit. Direkte Messungen der Bodenfeuchtigkeit sind aufwendig und manchmal undurchführbar. Erst viele Wiederholungen ergeben ein getreues Bild der natürlichen Streuungen der Feuchteverteilung im Bodenprofil.Wasserbilanzen, die anhand von Klimadaten berechnet werden, genügen ungefähr der Forderung nach einer Raum-Zeit integrierenden Technik. Die meisten Wasserbilanzmethoden verwenden die potentielle Evapotranspiration als Ausgangswert für den höchst möglichen Wasserverlust von Boden und Vegetation bei ungehindertem Wassernachschub. Im Freiland ohne zusätzliche Beregnung muss zur Abschätzung des tatsächlichen Wasserverlustea die potentielle Evapotranspiration um einen Betrag vermindert werden,der abhängig ist von der Austrocknung des Bodens, Wurzelsystem, Bodeneigenschaften und atmospherischen Bedingungen. Diese Bodenfeuchte-Schätzwerte können zur Erklärung von Schwankungen im Pflanzenwachstum und der Enteerträge, für die Abgrenzung von Vegetationszonen, für agrarklimatologische Klassifikationen, als Basis für Ernteertragsvorhersagen und für ähnliche Planungen gebraucht werden.

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Resume Le présent article passe en revue les différentes méthodes en usage pour calculer, estimer ou mesurer les pertes en eau du sol. En effet,dans tous les climats arides ou semi-arides, l'évapotranspiration est déterminante pour la production agricole. On peut ainsi établir les fluctuations du bilan hydrique du sol pour des laps de temps plus ou moins courts, en tenant compte du fait que l'évapotranspiration n'est pas seulement fonction des éléments météorologiques,mais aussi de la réserve en eat du sol: la première diminuant avec l'apauvrissement de la seconde.Le bilan hydrique du sol connu et calculé pour des périodes successives,il est possible d'établir de. précisions de récoltes. Celles-ci doivent être rectifiées périodiquement au fur et à mesure de l'avancement de la saison. Cet article est accompagné d'une très riche liste de publications traitant soit de la détermination de l'évapotranspiration,soit du calcul du bilan hydrique, soit enfin de son utilisation dans la précision des récoltes.

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Contribution No. 428 of the Plant Research Institute, Research Branch, Canada Department of Agriculture, Ottawa. Presented of the Symposium on Water and Climate, Saskatoon, Saskatchewan, 13 November 1964.     

The fine structure of the interrelationship of cells in the human epidermis

In the present investigation an analysis has been made of the fine structure of the interrelationships of cells in human forearm epidermis by means of the electron microscope. The "intercellular bridges," here called attachment zones, are more complex than has previously been recognized. It is shown that dense oval thickenings, called attachment plaques, appear in apposed areas of adjacent epidermal cell membranes. The tonofibrils terminate at the internal face of the attachment plaque and do not traverse the 300 A distance between apposed plaques. Seven intervening layers of unidentified substance occupy the space between attachment plaques. The attachment zones appear in all of the classical histological layers of the epidermis. The portions of epidermal cell membrane not involved in intercellular attachments have extensive surface area resulting from plication of the membrane, and its further modification to form microvilli. The possible functional significance of these observations is discussed. Prior observations concerning the basement membrane of epidermis are confirmed. Identification of epidermal melanocytes is achieved, the finer morphology of their dendritic processes is described, and their relationship to epidermal cells is discussed.