In order to enhance the resources, some fishes were introduced into Xiangmoshan reservoir. The introduced fishes consisted of different ecotypes such as silver carp （Hypophthahnichthys rnolitrix （Cuvier et Valencien...In order to enhance the resources, some fishes were introduced into Xiangmoshan reservoir. The introduced fishes consisted of different ecotypes such as silver carp （Hypophthahnichthys rnolitrix （Cuvier et Valenciennes））, big head （Aristichthys nobilis （Richardso）） and lake herring （Coregonus clupeaformis （Mitchill）） that were plankton feeders, common carp （Cyprinus carpio Linnaeus） and crucian carp （Carassius auratus gibelio） belonging to the polyphagia, and also the non-native predator Walleye （Stizostedion vitreum （Mitchill）） and big mouth （Silurus soldatovi rneridonalis Chen）, et al. Among there were not only the cool water fish Peled （Coregonus peled （Gmelin））, but also the warm water fish big mouth. The introduction of non-native fishes resulted in ecosystem changes of the reservoir and some native fishes had gone to decrease their population sizes or been in the condition of depopulation such as Opsariichthys uncirostris arnurensis （Berg）, Rhodeus sericeus （Pallas） and Silurus asotus （Linnaeus）. The native common carp had disappeared after the introduction of non-native species. Roach （Rutilus rutilus lacustris （Pallas） had been thriven for one or two generations after its introduction and immeidiatly disappeared. Silver fish （Protosalanx hyalocranius （Abbott））, Lake herring （Coregonus clupeaformis （Mitchill）） and Walleye （Stizostedion vitreum （Mitchill）） died several years after the introduction, so most of the introduced species has passed out of existence. Via many years introduction of different fishes, composition of species and the structure of the population in the reservoir had been changed obviously. It was necessary to further estimate whether the ecosystem of the reservoir had been damaged.展开更多
Biochemical mechanism of forming the red tide is discussed in this paper. The existence of a large number of nitrates and phosphates in the eutrophic water is the prerequisite of explosive increase of algae and the fo...Biochemical mechanism of forming the red tide is discussed in this paper. The existence of a large number of nitrates and phosphates in the eutrophic water is the prerequisite of explosive increase of algae and the forming of red tide. Reduction of eutrophication is an important approach to preventing the red tide. The method of deep treatment of the waste water and its denitrification and dephosphorization are introduced, and a new opinion on the red tide formation and fundamental prevention is put forward.展开更多
Purpose: Meningiomas are the most frequently diagnosed neoplasms. Ocular symptoms vary depending on size and localisation of the tumor, which is capable of compressing critical anatomic structures. Patients and Method...Purpose: Meningiomas are the most frequently diagnosed neoplasms. Ocular symptoms vary depending on size and localisation of the tumor, which is capable of compressing critical anatomic structures. Patients and Methods: A 44-year-old immunocompetent male was admitted to our hospital for further investigation of his bilateral optic disc swelling. A complete ophthalmological examination was performed including visual field assessment (VF), visual evoked potentials (VEP), fluorescein angiography (FLA) and magnetic resonance imaging (MRI). The patient had experienced only minor visual disturbances. Serological testing was performed. Results: Serological testing showed positive IgM and IgGtiters for cytomegalovirus (CMV) and subsequent imaging (MRI) revealed a frontal falxcerebri meningioma. Conclusions: We present a case of falx meningioma with overlapping serologically active CMV in an otherwise healthy and immunocompetent individual. Detailed differential diagnostic workup in immunocompetent individuals presenting with clinically unremarkable bilateral disc swelling is recommended.展开更多
文摘In order to enhance the resources, some fishes were introduced into Xiangmoshan reservoir. The introduced fishes consisted of different ecotypes such as silver carp （Hypophthahnichthys rnolitrix （Cuvier et Valenciennes））, big head （Aristichthys nobilis （Richardso）） and lake herring （Coregonus clupeaformis （Mitchill）） that were plankton feeders, common carp （Cyprinus carpio Linnaeus） and crucian carp （Carassius auratus gibelio） belonging to the polyphagia, and also the non-native predator Walleye （Stizostedion vitreum （Mitchill）） and big mouth （Silurus soldatovi rneridonalis Chen）, et al. Among there were not only the cool water fish Peled （Coregonus peled （Gmelin））, but also the warm water fish big mouth. The introduction of non-native fishes resulted in ecosystem changes of the reservoir and some native fishes had gone to decrease their population sizes or been in the condition of depopulation such as Opsariichthys uncirostris arnurensis （Berg）, Rhodeus sericeus （Pallas） and Silurus asotus （Linnaeus）. The native common carp had disappeared after the introduction of non-native species. Roach （Rutilus rutilus lacustris （Pallas） had been thriven for one or two generations after its introduction and immeidiatly disappeared. Silver fish （Protosalanx hyalocranius （Abbott））, Lake herring （Coregonus clupeaformis （Mitchill）） and Walleye （Stizostedion vitreum （Mitchill）） died several years after the introduction, so most of the introduced species has passed out of existence. Via many years introduction of different fishes, composition of species and the structure of the population in the reservoir had been changed obviously. It was necessary to further estimate whether the ecosystem of the reservoir had been damaged.
文摘Biochemical mechanism of forming the red tide is discussed in this paper. The existence of a large number of nitrates and phosphates in the eutrophic water is the prerequisite of explosive increase of algae and the forming of red tide. Reduction of eutrophication is an important approach to preventing the red tide. The method of deep treatment of the waste water and its denitrification and dephosphorization are introduced, and a new opinion on the red tide formation and fundamental prevention is put forward.
文摘Purpose: Meningiomas are the most frequently diagnosed neoplasms. Ocular symptoms vary depending on size and localisation of the tumor, which is capable of compressing critical anatomic structures. Patients and Methods: A 44-year-old immunocompetent male was admitted to our hospital for further investigation of his bilateral optic disc swelling. A complete ophthalmological examination was performed including visual field assessment (VF), visual evoked potentials (VEP), fluorescein angiography (FLA) and magnetic resonance imaging (MRI). The patient had experienced only minor visual disturbances. Serological testing was performed. Results: Serological testing showed positive IgM and IgGtiters for cytomegalovirus (CMV) and subsequent imaging (MRI) revealed a frontal falxcerebri meningioma. Conclusions: We present a case of falx meningioma with overlapping serologically active CMV in an otherwise healthy and immunocompetent individual. Detailed differential diagnostic workup in immunocompetent individuals presenting with clinically unremarkable bilateral disc swelling is recommended.
