Saturday, October 27, 2012

Iatrochemistry


by Valentin Chirosca

If you are not a socialist person, all socialist lessons about chemistry start appealing at scholastic "we know from Leucippus and Democritus that if you cut a pepper in the pieces the last piece is atomos ".
 With the work of Leucippus and Democritus ancient Greek philosophy reaches its zenith when the initial question of Thales after the true nature of matter culminated 180 years later in the subtle concept of atoms, which bears an amazing resemblance to the twentieth century's view of chemistry. For this reason, Leucippus and Democritus have undoubtedly deserved the first price for the best guess in antiquity, as far as natural science is concerned. Unfortunately their contemporaries did not share their views with the same enthusiasm. 

Forget the late invention of paper for European space, where is alchemy? Paracelsus split alchemy on iatrochemistry and magic.
"The familiar medical roots ‘-iatry, -iatrics, iatro-,’ and their variants traditionally have traced their etymology to the Attic Greek word for physician, ‘iatros’. This paper traces the etymology of ‘iatros’ itself. Proceeding stepwise through time, the article demonstrates the evolution and borrowing of the word from its immediate Archaic Greek predecessor, the ‘iatār’, and further back to its earliest Greek form in the Linear B inscriptions. Beyond the Greek, it is then demonstrated how the Linear B was a direct borrowing from the non-Greek Linear A, an earlier language of the Ancient Mediterranean. From there, the article examines the likely cognate forms in the even earlier Hittite, Egyptian, and Akkadian languages to the East. Ultimately the origin of the ‘iatros’, of our English root ‘-iatry’, is traced to the earliest recorded language, Sumerian, and the Sumerian word for physician, the ‘IA.ZU’."
by Elliott B. Martin, MD 
"Iatrochemistry (or chemiatry) is a branch of both chemistry and medicine. Having its roots in alchemy, iatrochemistry seeks to provide chemical solutions to diseasesand medical ailments.
This area of science has fallen out of use since the rise of modern medical practices. However, iatrochemistry was popular between 1525 and 1660, especially in Flanders. Its most notable leader was Paracelsus, an important Swiss alchemist of the 16th century. Iatrochemists believed that physical health was dependent on a specific balance of bodily fluids.
Alchemists used plant products and arsenic to treat diseases. The medical chemistry of the 16th and 17th centuries gained the name iatrochemistry, coming from the Greek word for physician."
The term is coined as Chymistry (1661) – the subject of the material principles of mixed bodies (Boyle)  the "father of modern chemistry".[13] In his book, The Skeptical Chymist, Boyle attacked Paracelsus and the natural philosophy of Aristotle, which was taught at universities. However, Boyle's biographers, in their emphasis that he laid the foundations of modern chemistry, neglect how steadily he clung to the scholastic sciences and to alchemy, in theory, practice and doctrine.[14] The decline of alchemy continued in the 18th century with the birth of modern chemistry, which provided a more precise and reliable framework within a new view of the universe based on rational materialism.

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Monday, October 15, 2012

Industrial age.

English: Pres. U.S. Grant (between 1870 and 18...
English: Pres. U.S. Grant (between 1870 and 1880) Français : Le président américain Ulysses Grant (Photo prise entre 1870 and 1880) (Photo credit: Wikipedia)

No More Industrial Revolutions?
By THOMAS B. EDSALL
The American economy is running on empty. That’s the hypothesis put forward by Robert J. Gordon, an economist at Northwestern University. Let’s assume for a moment that he’s right. The political consequences would be enormous.
The author express here "dark age " feelings common if you are familiar with e-book subject.
 While the mass market print book is threatened, the long tail of the print book market is more alive than ever. While the mass market print book is indeed threatened, for once the threat is not from political or religious extremists. Instead, it is from the ebook. There is some confusion about what a book is.
Economy is indeed threatened. It is from the e-Economy.
The picture painted in the article above is very one-sided. Tracing the rise and fall of various one-time imperial powers, from Portugal and Spain to France and England, Kennedy shows how the cost, mostly military, of maintaining and defending their trade routes and colonies around the world eventually produced unsustainable debt and eventually caused these empires to fall.
This is clearly part of what is happening to the United States. Our struggle to maintain our military and political dominance of the world -- two wars in a decade and another on the way -- it is an important contributor to the decline of our productivity and our increasing debt burden.
In the long run it will be hard for the US to maintain it's "superpower" status as it attempts to compete economically with countries that do not have the huge military overhead that we do. Our military budget is larger than that of the next the next 20 countries combined.

Paul Kennedy's book may be 25 years old, but what it said about the future fate of the United States shows that some predictions can be quite accurate, especially if they are ignored.

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Thursday, October 11, 2012

FOLIA ENTOMOLOGICA HUNGARICA dixit...

Galego: Pteromalidae en Valverde, Vilarromarís...
Galego: Pteromalidae en Valverde, Vilarromarís, Oroso cf. Pteromalidae (Photo credit: Wikipedia)


By Valentin Chirosca
Erythromalus rufiventris (WALKER, 1835) – Romania, [Alba county,] Munții Cugirului, Rîu Mare, 5.VIII.1913, 2 females, leg. BÍRÓ, HNHM; Romania, [Harghita county,] Munții Giurgiului, Praid, 1.VII.1995, 1 female, leg. PODLUSSÁNY, HNHM; Romania, [Alba county,] Muntii Cugirului, Sugag, 20.VII.1993, 1 female, leg. ROZNER, HNHM. – Its biology is unknown.
New species for Romania.
New records of Pteromalidae (Hymenoptera: Chalcidoidea) for the fauna of Romania and the Carpathian Basin, Z. LÁSZLÓ
kingdom Animalia - animals »  phylum Arthropoda - arthropods »  class Insecta - insects »  order Hymenoptera - bees, ants and wasps »  family Pteromalidae
Identifiers
urn:lsid:ubio.org:namebank:9644495
Catalogue of Life accepted name
Erythromalus rufiventris (Walker, 1835)
Synonyms
Pteromalus empoclus Walker, 1839
Pteromalus rufiventris Walker, 1835
Pteromalidae is one of the largest families of Chalcidoidea, with circa 570 valid genera and 2900 species. They are cosmopolitan in distribution. Important morphological characters include a usually 13-segmented antenna; parapsidal sutures distinct, but often incomplete; propodeum usually well developed. Pteromalids have been considered the most difficult Chalcidoidea to identify; morphologically they are exceedingly diverse, and thus no combination of taxonomic characters is reliable for identification.

Most Pteromalidae are primary parasitoids, but hyperparasitic species are common. Most species are ectoparasitic, but endoparasitic species are common also. Solitary and gregarious species and races are common. Generally, this family has a wide host range. Most species are gregarious ectoparasitoids of larvae and pupae of Lepidoptera and Coleoptera, but a number of species attack larvae and pupae of Diptera as well. Some are predaceous on eggs of Coccidae. There are no phytophagous species. Considerable importance has been placed on pteromalids for biological control of Lepidoptera, Coleoptera and synanthropic Diptera. A few species have also been used for the biological control of Coccidae. Checklist of UK Recorded Pteromalidae
The Pteromalinae show diverse behavior, and contain species reared from nay kinds of insects and other arthropods. Some examples are Rhopalicus parasitizing Scolytidae; Anisopteromalus and Dinarmus parasitizing Bruchidae; Pseudocatolaccus parasitizing Cecidomyiidae; Muscidifurax and Nasonia parasitizing Muscidae and Calliphoridae; Gomicobia parasitizing Scolytidae; Trichomalopis and Dibrachys parasitizing Thomisidae (Araneae) and Aphidiidae (Hymenoptera); Arachnopteromalus dasys Gordh attacking the egg sac of Uloboridae (Araneae). Diverse behavior is also shown within a closely related group of species and subspecies, the Muscidifurax. Although taxonomic differentiation of this genus into its 5 identified species is difficult, relying heavily on male genitalia, behaviorally there are great differences shown in courtship, gregarious or solitary oviposition, size, unisexual and bisexual reproduction, etc.
Life Cycle

Pteromalids usually have short life cycles, averaging circa 3 weeks from egg to adult at room temperature. There was a minimum of 10 days recorded for Habrocytus cerealellae and Nasonia vitripennis. The females of many species require 1-2 days longer for development than do the males. The incubation of the egg requires from less than 1 day to 3 days, the larval stage 4-10 days and the pupal stage 4-14 days. A notable exception is E. ovivora, in which the egg, larval, and pupal stages take 7 days, 20 days and circa 11 months, respectively (Clausen 1940/1962).

The availability of suitable host stages influences the number of generations per year. Most species produce generation after generation as long as hosts are available, but some species are limited to a fixed number. E. ovivora has only one generation per year which corresponds to the host cycle. Pirene graminea and Stenomalus micans have two generations, as do their respective hosts. However, Aplastomorpha calandrae (Cotton 1923) and H. cerealellae are able to produce several generations to each one of the host. In these species there is no need for synchronization of the cycles of parasitoid and host, for they attack insects infesting stored grains which have all stages present continuously. Trineptis klugii has circa 6 generations each year on one brood of the host.

Most species that hibernate do so in the mature larval stage within the host cocoon, puparium or cell. But, Eupteromalus nidulans is found in the hibernation webs of the satin and brown-tail moths. E. ovivora, Rhopalicus suspensus Ratz., and Merisus febriculosus Gir. pass the winter in the pupal stage, while Dibrachoides dynastes and Pseudocatolaccus asphondyiiae Masi persist through the winter as adults. Other may pass winter as either mature larvae or adults.

A number of Pteromalidae are able to undergo long periods of inactivity as either larvae or adults when conditions are unfavorable. The relation of food to reproduction in Spintherus and Peridesmia was already noted, and it was shown that phasic castration in females may continue for a long time. This is one way of maintaining a species during periods of adverse conditions; another is larval diapause, such as is found in H. medicaginis Gahan and Nasonia vitripennis. In the former individuals have been observed to pass almost two years in the larval stage, as compared to the normal two weeks. Nasonia vitripennis may even pass several years in dipterous puparia when conditions are unfavorable (Clausen 1940/1962).



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Tuesday, October 09, 2012

Review: The Engineering of Chemical Reactions


The Engineering of Chemical Reactions
The Engineering of Chemical Reactions by Lanny D. Schmidt

My rating: 3 of 5 stars



by Valentin Chirosca
"Perhaps the central idea to come from Minnesota is the notion of modeling in chemical engineering. This is the belief that the way to understand a complex process is to construct the simplest description that will allow one to solve the problem at hand. Sometimes a single equation gives this insight in a back-of-the-envelope calculation, and sometimes a complete simulation on a supercomputer is necessary. The chemical engineer must be prepared to deal with problems at whatever level of sophistication is required. We want to show students how to do simple calculations by capturing the essential principles without getting lost in details. At the same time, it is necessary to understand the complex problem with sufficient clarity that the further steps in sophistication can be undertaken with confidence. A modeling approach also reveals the underlying beauty and unity of dealing with the engineering of chemical reactions."
Modelling is the best way to understand processes, if you design a process first fix the mass balances and after that energy balances using the simplest way: chemical calculations.



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Review: Chemical Reaction Engineering


Chemical Reaction Engineering
Chemical Reaction Engineering by Octave Levenspiel

My rating: 4 of 5 stars



byRobert Ashe AM Technology

Small chemical reactors offer a number of benefits compared to large reactors, such as better heat transfer and mixing. While small batch vessels are impractical at the industrial scale, continuous flow reactors can provide the benefits of small physical size without the practical difficulties of multiple vessels. This article considers the four basic needs of flow reactors (volumetric capacity, heat transfer, plug flow and mixing) ...


While as few as three tanks in series have been employed by some users, a substantial improvement in plug flow (in terms of residence time distribution) is observed by using ten stages


by Valentin Chirosca


We a working to save your time and money. Just how useful is a half century old textbook. Excellent resource for first look informing customers.


Pace is leisurely, and where needed, time is taken to consider why certain assumptions are made,...to develop new ways of thinking and new intuitions.





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Sunday, October 07, 2012

Review: The Sceptical Chymist


The Sceptical Chymist
The Sceptical Chymist by Robert Boyle

My rating: 0 of 5 stars



by Valentin Chirosca
That the Vulgar Principles were lesse General and comprehensive, or lesse considerately Deduc’d from Chymical Operations, than was believ’d; it was not uneasie for me both to Take notice of divers Phænomena, overlook’d by prepossest Persons, that seem’d not to suite so well with the Hermetical Doctrine; and, to devise some Experiments likely to furnish me with Objections against it, not known to many, that having practis’d Chymistry longer perchance then I have yet liv’d, may have far more Experience, Than I, of particular processes.
Robert Boyle
Boyle was an advocate of corpuscularism, a form of atomism that was slowly displacing Aristotelian and Paracelsian views of the world. Instead of defining physical reality and analyzing change in terms of Aristotelian substance and form and the classical four elements of earth, air, fire, and water—or the three Paracelsian elements of salt, sulfur, and mercury—corpuscularism discussed reality and change in terms of particles and their motion. Boyle believed that chemical experiments could demonstrate the truth of the corpuscularian philosophy. In this context he defined elements in [b:Sceptical Chymist|6800855|The Sceptical Chymist|Robert Boyle|http://www.goodreads.com/assets/nocover/60x80.png|7007102] (1661) as "certain primitive and simple, or perfectly unmingled bodies; which not being made of any other bodies, or of one another, are the ingredients of which all those called perfectly mixt bodies are immediately compounded, and into which they are ultimately resolved."
He was probably referring to the uniform corpuscles—which were as yet unobserved—out of which corpuscular aggregates were formed, not using elements as Antoine-Laurent Lavoisier and others used the term in the 18th century to refer to different substances that could not be broken down further by chemical methods. In his experiments Boyle made many important observations, including that of the weight gain by metals when they are heated to become calxes. He interpreted this phenomenon as caused by fiery particles that were able to pass through the walls of glass vessels.

Boyle’s theories of material change did nothing to eliminate the possibility of the transmutation of base metals to gold that was at the heart of alchemy. Indeed he practiced alchemy until the end of his life, believed that he had witnessed transmutation, and successfully lobbied Parliament to repeal England’s ban on transmutation.





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