Effect of morphine hydrochloride on growth accumulated degree hour and cephalopharyngeal skeleton of the larvae ofParasarcophaga crassipalpisunder natural condition

2015 ◽  
Vol 36 (11) ◽  
pp. 1202 ◽  
Author(s):  
Nan ZHANG ◽  
Xiao-li NIU ◽  
Jie LIANG ◽  
Fan YANG ◽  
Hong-jun XU ◽  
...  
Derrida Today ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 1-16
Author(s):  
Francesco Vitale

This paper intends to verify the extent and effectiveness of the transforming appropriation of the Derridean concept of ‘differance’ by Stiegler with respect to the problems that, according to Stiegler, make this creative critical operation necessary; in particular with respect to the most recent question concerning the possibility of thinking about and putting into practice a ‘neganthropological différance’ capable of facing the ecological crisis that today seems to threaten the very existence of life on earth. The paper goes back to Technics and Time 1. to analyze the distinction between ‘vital difference’ and ‘noetic difference’ that constitutes the condition of possibility of the ‘neganthropological différance.’ In this perspective, the distinction proposed by Stiegler seems to re-propose the hierarchically oriented oppositional structure that characterizes metaphysical thought and in particular the opposition between man and animal, attributing to the human being the ability to free himself from the constraints of his biological-natural condition. Finally, the paper attempts to account for the repercussions of this approach on the very possibility of an effective response to the ecological crisis, concluding with a provocation regarding the role that theory can and must play with regard to such an urgent and far-reaching problem.


1899 ◽  
Vol 31 (4) ◽  
pp. 73-76
Author(s):  
F. M. Webster

With the constantly increasing activity in applied entomology in America, the necessity for rooms or apartments especially adapted for the study of the development of insects is becoming each year more imperative. The insectary has, in fact, become almost as necessary to the working entomologist as has the laboratory to the chemist. While it is especially true in entomological investigations that one must “study nature where nature is,” it is equally true that on cannot, in all cases, watch with the necessary care and constant application in the fields that he will be able to do in a faily well equipped insectary. Not only can forms be transported thousands of miles while in an inactive state and their development watched at close range, as it were, but eggs and larvae may be brought in during late autumn or winter and studied through their various stages, frequently long before they have appeared outside; and in cases of uncommon or unfamiliar forms this will give the investigator a vast amount of information that he can use to great advantage when the species appears in the fields under a natural condition, perhaps months later.


2001 ◽  
Vol 53 (1-2) ◽  
pp. 35-39 ◽  
Author(s):  
E. Smet ◽  
G. Van der Weken ◽  
W. R. G. Baeyens ◽  
J. P. Remon

2004 ◽  
Vol 39 (7) ◽  
pp. 615-623 ◽  
Author(s):  
Rafael Vasconcelos Ribeiro ◽  
Mauro Guida dos Santos ◽  
Gustavo Maia Souza ◽  
Eduardo Caruso Machado ◽  
Ricardo Ferraz de Oliveira ◽  
...  

Photosynthetic responses to daily environmental changes were studied in bean (Phaseolus vulgaris L.) genotypes 'Carioca', 'Ouro Negro', and Guarumbé. Light response curves of CO2 assimilation and stomatal conductance (g s) were also evaluated under controlled (optimum) environmental condition. Under this condition, CO2 assimilation of 'Carioca' was not saturated at 2,000 µmol m-2 s-1, whereas Guarumbé and 'Ouro Negro' exhibited different levels of light saturation. All genotypes showed dynamic photoinhibition and reversible increase in the minimum chlorophyll fluorescence yield under natural condition, as well as lower photosynthetic capacity when compared with optimum environmental condition. Since differences in g s were not observed between natural and controlled conditions for Guarumbé and 'Ouro Negro', the lower photosynthetic capacity of these genotypes under natural condition seems to be caused by high temperature effects on biochemical reactions, as suggested by increased alternative electron sinks. The highest g s values of 'Carioca' were observed at controlled condition, providing evidences that reduction of photosynthetic capacity at natural condition was due to low g s in addition to the high temperature effects on the photosynthetic apparatus. 'Carioca' exhibited the highest photosynthetic rates under optimum environmental condition, and was more affected by daily changes of air temperature and leaf-to-air vapor pressure difference.


The author gives an account of a series of experiments on the products of the respiration of plants, and more particularly of the leaves; selecting, with this view, specimens of plants which had been previously habituated to respire constantly under an inclosure of glass; and employing, for that purpose, the apparatus which he had formerly used in experimenting on the combustion of the diamond, and consisting of two mercurial gasometers, with the addition of two hemispheres of glass closely joined together at their bases, so as to form an air-tight globular receptacle for the plant subjected to experiment. The general conclusions he deduces from his numerous experiments conducted during several years, are, first, that in leaves which are in a state of vigorous health, vegetation is always operating to restore the surrounding atmospheric air to its natural condition, by the absorption of carbonic acid and the disengagement of oxygenous gas: that this action is promoted by the influence of light, but that it continues to be exerted, although more slowly, even in the dark. Secondly, that carbonic acid is never disengaged during the healthy condition of the leaf. Thirdly, that the fluid so abundantly exhaled by plants in their vegetation is pure water, and contains no trace of carbonic acid. Fourthly, that the first portions of carbonic acid gas contained in an artificial atmosphere, are taken up with more avidity by plants than the remaining portions; as if their appetite for that pabulum had diminished by satiety.


Biologia ◽  
2012 ◽  
Vol 67 (1) ◽  
Author(s):  
Božena Šerá

AbstractRegeneration of Slender speedwell (Veronica filiformis) from small parts of stem without using stimulative agents was the focus of the investigation. Four different short fragments of shoot (main terminal, secondary terminal, nodal segment and internodal segment) were cultivated under greenhouse and natural conditions. All tested vegetative segments induced roots, rooted in a soil substrate and in a semi-natural lawn, survived winter, and flowered. Multiplication of clonal plants was confirmed for both the main and secondary terminal segments. These terminal segments had the best response in number of growing individuals, flowering stems, and weight of dried biomass. The manipulative experiment revealed that clonal success of speedwell is connected with possibilities to hive off of all tested above-ground segments. Establishment of plantlets from the segment in natural condition was not successful when accompanied by certain grass species.


1869 ◽  
Vol 14 (68) ◽  
pp. 471-489
Author(s):  
D. De Berdt Hovell

The constitution of man is tripartite; his well-being depends upon the soundness of his physical, mental, and moral condition. These three conditions are quite distinct, though they do not exist separately; a combination of them all in their different degrees and relations is necessary to the right exercise of their respective functions. They are all material, that is, they are essential conditions of the structures which represent them, and on the integrity of which their existence depends. There may be some hesitation in admitting this statement as regards the moral qualities, at the same time there is a wide difference between the feelings and passions which man possesses as a creature, and the principles of justice, mercy, and truth which are the attributes of the Creator. Mere feelings and passions belong to animals as well as to man. It is the association of these with the higher principles of which man's nature is capable that constitutes the emotions. The distinction between his moral qualities and the higher principles with which man has been endowed in order to guide them is, that the former move him in so much as they affect his physical condition, the latter simply raise and elevate his whole character. Thus, the passion of anger may excite a man and flush his face, disappointment may depress him, and fear blanch his features, but the exercise of justice, mercy, and truth do not disturb him; in proportion as he possesses these qualities he rises above his natural condition, and in proportion as he is deficient in them is his tendency to become degraded.


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