Unusual triplet–triplet annihilation in a 3D copper(I) chloride coordination polymer

Abstract: A new coordination polymer (CP) defined as [Cu2Cl2 (EtS(CH2 )4SEt) 4]n (CP2) was prepared by reacting EtS(CH2)4 SEt with CuCl in acetonitrile in a 1 : 2 stoichiometric ratio. The X-ray structure reveals formation of non-porous 3D material composed of parallel 2D-[Cu2Cl 2S2 ]n layers of Cl-bridged Cu2(m-Cl) 2 rhomboids assembled by EtS(CH2) 4SEt ligands. A weak triplet emission (Fe o 0.0001) is observed in the 400–500 nm range with te of 0.93 (298 K) and 3.5 ns (77 K) as major components. CP2 is the only 2nd example of emissive thioether/CuCl-containing material and combined DFT/TDDFT computations suggest the presence of lowest energy M/XLCT excited states. Upon increasing the photon flux (i.e. laser power), a triplet–triplet annihilation (TTA) is induced with quenching time constants of 72 ps (kQ = 1.3 1010 s 1 ) and 1.0 ns (kQ = 7.1 108 s 1 ) at 298 and 77 K, respectively, proceeding through an excitation energy migration operating via a Dexter process. Two distinct (Io)1/2 (Io = laser power) dependences of the emission intensity are depicted, indicating saturation as the observed emission increases with the excitation flux. These findings differ from that previously reported isomorphous CP [Cu2Br2(m-EtS(CH2)4SEt)4]n (CP1), which exhibits no TTA behaviour at 77 K, and only one (laser power)2 dependence at 298 K. The B18-fold increase in kQ upon warming CP2 from 77 to 298 K indicates a temperature-aided TTA process. The significant difference between the presence (slower, CP2) and absence (CP1) of TTA at 77 K is explained by the larger unit cell contraction of the former upon cooling. This is noticeable by the larger change in inter-rhomboid Cu Cu separation for CP2

Fish Bulletin No. 38. The California Shrimp Industry

Fishing for shrimp in San Francisco Bay started about 1869. The first fishermen were Italians and there were 8 boats engaged in the fishery. They used small meshed seines 60 feet long and 8 feet deep with a bag in the center. The nets were used in deep water and took very few small shrimp or fish. They usually took from 50 to 75 pounds of shrimp in a haul and made from 3 to 5 hauls on each tide.In 1871 the Chinese introduced the Chinese shrimp net and began to take large quantities of shrimp, but as the market for fresh shrimp has always been limited, the greater portion of the catches was dried for export to China. The Chinese fished in Tomales Bay and San Francisco Bay. The Tomales Bay camps were abandoned during the early nineties. In 1885 public opinion became aroused against the Chinese nets, as they took large quantities of young fish, and the controversy on this subject continued until 1901, when the Legislature passed a law placing a closed season on shrimp fishing for the months of May, June, July and August. The Chinese hired attorneys to fight this. A boat crew was arrested for a test case, which the State won through all the courts up to and including the United States Supreme Court. In 1905 the shrimp interests managed to get the four-month closed season removed, but at the same time it was made unlawful to export dried shrimps. In 1909 a closed season of three months, June, July and August, was again adopted, and in 1911 the use of the Chinese nets was prohibited altogether. During the period from 1900 to 1911 there was constant trouble over the shrimp fishing. Fish and game deputies were arresting the Chinese crews and there was continual agitation. In 1915 the backers of the Chinese put through a bill which again allowed shrimp fishing on south San Francisco Bay (District 13) with the Chinese shrimp nets. At about the same time a trawl was put in use in the northern end of the bay. The law prohibiting the exportation of dried shrimps was retained until 1919, when it was repealed. From 1919 to the present time Chinese shrimp nets have been used in District 13, the shrimp trawls in District 12, and not more than one-half of any one catch could be dried legally.Shrimp fishing is carried on under several methods of organization. Frank Spenger Company and Quan Brothers maintain their own camps and buy the shrimps from the trawlers, who fish for them at a definite price per pound. The fishermen in this case have no more interest in the shrimps after they have delivered them. The Chinese camps in South San Francisco are organized under three working plans. The larger number of camps are owned by Chinese companies maintaining offices in Chinatown. These camps are leased to a group of men who work on shares among themselves. The company which owns the camp is paid for its use by handling the total catch at a definite price which allows it a profit. The price paid to the camps for fresh shrimps, forinstance, has been 5½ cents per pound for a number of years. The camp crew maintains the boats, gear and buildings, and manages its own commissary as a community affair. One man is usually camp boss and has the responsibility of supervising the activities of the camp. There are two camps which depart from this procedure. In one of these, twomen own the camp and gear and pay definite wages and found to the crew, and in the other, two men own the boat and gear and work in partnership, sometimes hiring a third man.The present day camps vary from a 2 man outfit fishing 20 nets to a camp of 8 men using 50 nets.The first of September is the beginning of the fiscal year in the camps. At this time the shareholders are at liberty to break away if they choose and go to some other camp. Very few groups stay together more than a year, and there is considerable shifting around, though few men leave the fishery and very few new men come in.The beds maintained by each company are held from year to year. They were originally laid out on a first-come-first-served basis. There are unwritten rules concerning the staking of new beds. A new bed must be far enough away so it will not "cork" an old bed. "Claim jumping" is rare, but a controversy over this between two large companies nearly precipitated a tong war in 1930. The matter was, however, amicably arranged. A bed does not necessarily have to be operated to be held. The larger companies generally have two or more beds, although they seldom work more than one. In some portions of the bay the beds can be used only during the summer due to weather conditions, and these are left idle during the winter

Fish Bulletin No. 14. Report on the Seals and Sea Lions of California, 1928

In 1926 a few complaints and several petitions were received by the Division of Fish and Game from the fishing industries regarding damage to fishing by seals and sea lions. Early in 1927 the complaints became more numerous. This was the direct result of propaganda by sea lion hunters from Oregon. These men have hunted sea lions for several seasons for a bounty in the state of Oregon. As the sea lions in Oregon are becoming scarce, due to their activities, they made a trip along the coast of California, stopping at all the principal fishing centers, locating the rookeries, and talking to the fishermen, with a view to hunting in California. As there was no possibility that the Division of Fish and Game would consider a bounty on seals and sea lions, the hunters tried to interest the fishermen to the extent of raising a fund with which to pay a small bounty. The fishermen's organizations agreed to raise the fund, but nothing has been done toward it to date. The fishing industries, in their complaints, set forth as their grievances that the seals and sea lions are very numerous; that they are on the increase, and that they take enormous quantities of fish and cause considerable damage to gear. There are two species of sea lions: Steller's sea lion (Eumetopias stelleri); the California sea lion (Zalophus californianus), and the one species of seal, the harbor seal (Phoca vitulina), found on the coast of California

Fish Bulletin No. 38. The California Shrimp Industry

Fishing for shrimp in San Francisco Bay started about 1869. The first fishermen were Italians and there were 8 boats engaged in the fishery. They used small meshed seines 60 feet long and 8 feet deep with a bag in the center. The nets were used in deep water and took very few small shrimp or fish. They usually took from 50 to 75 pounds of shrimp in a haul and made from 3 to 5 hauls on each tide.In 1871 the Chinese introduced the Chinese shrimp net and began to take large quantities of shrimp, but as the market for fresh shrimp has always been limited, the greater portion of the catches was dried for export to China. The Chinese fished in Tomales Bay and San Francisco Bay. The Tomales Bay camps were abandoned during the early nineties. In 1885 public opinion became aroused against the Chinese nets, as they took large quantities of young fish, and the controversy on this subject continued until 1901, when the Legislature passed a law placing a closed season on shrimp fishing for the months of May, June, July and August. The Chinese hired attorneys to fight this. A boat crew was arrested for a test case, which the State won through all the courts up to and including the United States Supreme Court. In 1905 the shrimp interests managed to get the four-month closed season removed, but at the same time it was made unlawful to export dried shrimps. In 1909 a closed season of three months, June, July and August, was again adopted, and in 1911 the use of the Chinese nets was prohibited altogether. During the period from 1900 to 1911 there was constant trouble over the shrimp fishing. Fish and game deputies were arresting the Chinese crews and there was continual agitation. In 1915 the backers of the Chinese put through a bill which again allowed shrimp fishing on south San Francisco Bay (District 13) with the Chinese shrimp nets. At about the same time a trawl was put in use in the northern end of the bay. The law prohibiting the exportation of dried shrimps was retained until 1919, when it was repealed. From 1919 to the present time Chinese shrimp nets have been used in District 13, the shrimp trawls in District 12, and not more than one-half of any one catch could be dried legally.Shrimp fishing is carried on under several methods of organization. Frank Spenger Company and Quan Brothers maintain their own camps and buy the shrimps from the trawlers, who fish for them at a definite price per pound. The fishermen in this case have no more interest in the shrimps after they have delivered them. The Chinese camps in South San Francisco are organized under three working plans. The larger number of camps are owned by Chinese companies maintaining offices in Chinatown. These camps are leased to a group of men who work on shares among themselves. The company which owns the camp is paid for its use by handling the total catch at a definite price which allows it a profit. The price paid to the camps for fresh shrimps, forinstance, has been 5½ cents per pound for a number of years. The camp crew maintains the boats, gear and buildings, and manages its own commissary as a community affair. One man is usually camp boss and has the responsibility of supervising the activities of the camp. There are two camps which depart from this procedure. In one of these, twomen own the camp and gear and pay definite wages and found to the crew, and in the other, two men own the boat and gear and work in partnership, sometimes hiring a third man.The present day camps vary from a 2 man outfit fishing 20 nets to a camp of 8 men using 50 nets.The first of September is the beginning of the fiscal year in the camps. At this time the shareholders are at liberty to break away if they choose and go to some other camp. Very few groups stay together more than a year, and there is considerable shifting around, though few men leave the fishery and very few new men come in.The beds maintained by each company are held from year to year. They were originally laid out on a first-come-first-served basis. There are unwritten rules concerning the staking of new beds. A new bed must be far enough away so it will not "cork" an old bed. "Claim jumping" is rare, but a controversy over this between two large companies nearly precipitated a tong war in 1930. The matter was, however, amicably arranged. A bed does not necessarily have to be operated to be held. The larger companies generally have two or more beds, although they seldom work more than one. In some portions of the bay the beds can be used only during the summer due to weather conditions, and these are left idle during the winter

Fish Bulletin No. 14. Report on the Seals and Sea Lions of California, 1928

In 1926 a few complaints and several petitions were received by the Division of Fish and Game from the fishing industries regarding damage to fishing by seals and sea lions. Early in 1927 the complaints became more numerous. This was the direct result of propaganda by sea lion hunters from Oregon. These men have hunted sea lions for several seasons for a bounty in the state of Oregon. As the sea lions in Oregon are becoming scarce, due to their activities, they made a trip along the coast of California, stopping at all the principal fishing centers, locating the rookeries, and talking to the fishermen, with a view to hunting in California. As there was no possibility that the Division of Fish and Game would consider a bounty on seals and sea lions, the hunters tried to interest the fishermen to the extent of raising a fund with which to pay a small bounty. The fishermen's organizations agreed to raise the fund, but nothing has been done toward it to date. The fishing industries, in their complaints, set forth as their grievances that the seals and sea lions are very numerous; that they are on the increase, and that they take enormous quantities of fish and cause considerable damage to gear. There are two species of sea lions: Steller's sea lion (Eumetopias stelleri); the California sea lion (Zalophus californianus), and the one species of seal, the harbor seal (Phoca vitulina), found on the coast of California

Programme d'éducation thérapeutique pour le patient hypertendu (approche pharmaceutique)

DIJON-BU Médecine Pharmacie (212312103) / SudocSudocFranceF

L'apothicairerie d'Alise Sainte Reine

DIJON-BU Médecine Pharmacie (212312103) / SudocSudocFranceF

Les phosphatases alcalines du testicule de Lebistes reticulatus : mise au point d'une microméthode de détermination quantitative

L'utilisation de substrats chromogènes appropriés permet l'étude qualitative de l'équipement enzymatique des microorganismes. Nous avons appliqué cette méthode à la détermination quantitative des phosphatases alcalines du testicule de Lebistes reticulatus (poids moyen de l'organe: 2,5 mg). Cette microméthode de dosage enzymatique pourrait être généralisée à toute enzyme développant une coloration spontanée en présence d'un substrat approprié

Teologiá Moralis : Tomus secundus. de virtute, et statu religionis. ...

En la antep. : Oeuvres de M. L'Abbé de CondillacAutor tomado de la antepSign. : []\p2\\s, A-Z\p8/4,\s 2A-2E\p4/8\

Molecular characterization of the principal symbiotic bacteria of the weevil Sitophilus oryzae: A peculiar G + C content of an endocytobiotic DNA

3 tables 5 graph.International audienceThe principal intracellular symbiotic bacteria of the cereal weevil Sitophilus oryzae were characterized using the sequence of the 16S rDNA gene (rrs gene) and G + C content analysis. Polymerase chain reaction amplification with universal eubacterial primers of the rrs gene showed a single expected sequence of 1,501 bp. Comparison of this sequence with the available database sequences placed the intracellular bacteria of S. oryzae as members of the Enterobacteriaceae family, closely related to the free-living bacteria, Erwinia herbicola and Escherichia coli, and the endocytobiotic bacteria of the tsetse fly and aphids. Moreover, by high-performance liquid chromatography, we measured the genomic G + C content of the S. oryzae principal endocytobiotes (SOPE) as 54%, while the known genomic G + C content of most intracellular bacteria is about 39.5%. Furthermore, based on the third codon position G + C content and the rrs gene G + C content, we demonstrated that most intracellular bacteria except SOPE are A + T biased irrespective of their phylogenetic position. Finally, using the hsp60 gene sequence, the codon usage of SOPE was compared with that of two phylogenetically closely related bacteria: E. coli, a free-living bacterium, and Buchnera aphidicola, the intracellular symbiotic bacteria of aphids. Taken together, these results show a peculiar and distinctly different DNA composition of SOPE with respect to the other obligate intracellular bacteria, and, combined with biological and biochemical data, they elucidate the evolution of symbiosis in S. oryzae