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1
artículo
This study seeks to identify the main factors that have most directly influenced the coastal deforestation process on a secular scale are identified. There are five factors that can be identified as generators of coastal forest deterioration: domestic use for construction and use of firewood for cooking food; use of wood in mining and metallurgical activities and employment in shipbuilding as well as in land transport with the arrival and spread of railways.
2
artículo
This article aims to document and understand the development of Ica culture and subsequent occupation of the Archaeological site Tacaraca, to encourage such research and cultural appreciation. As is known, the area of Ica was the scene of two major development of Paracas and Nasca cultures (800 a.C. to 600 d.C.), however, during the Late Intermediate Period (1000 -1470 d.C), after the Huari decline, Ica culture was the most important company that was established in the Ica valley and had as Tacaraca main center. The main buildings identified in the place match constructions administrative and religious well- planned structures that are interconnected by walkways and stairs leading to important architectural spaces with fine finishes.
3
artículo
Publicado 2014
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This article presents the petrographic study of 21 thin sections of ceramics from the Formative site of Puémape, on the northern litoral of Peru, a site with strong afiliation to the Cupisnique culture. The results suggest the existence of several local productions, with a difference in resource area and manufacture between the Middle and Late Puemape phases. A graphite-on-red decorated bottle stands out as non local, for its intrusive composition and unique stylistic character. Its occurence is examined in view of other ceramics of similar type and composition found in the Jequetepeque valley.
4
artículo
Publicado 2023
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“Introduction: Coastal waste increases up to four times each year, although many of them can generate sustainability if they are used as renewable resources; in this sense, the research is based on Garofalo’s STEAM proposal, adapting its urban robotic version to the educational exploration of beaches. An experiment of social responsibility was developed through a robotic ecology program based on three pedagogical phases: (a) Social ecological intelligence, (b) Social scientific task, (c) Scientific reflection; whose effects try to contribute to the sustainable care of a polluted beach. Method: Through the positivist paradigm, experimental design study, two groups of students were formed out of a total of 80 subjects residing in a coastal district of Lima. A contaminated beach context was approached, from which basic school students recycled waste to elaborate robot prototypes. Result...
5
artículo
Publicado 2017
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The study aimed to determine the seroprevalence and risk of infection of bovine leptospirosis in dairy farms of the Peruvian coast and highlands. A total of 88 blood samples were obtained in a farm in the area of Lima (coast) and 163 samples in a farm in the area of Huancayo (highlands), both belonging to the National University of San Marcos. The samples were analyzed by the microagglutination test to detect antibodies to serovars canicola, pomona, icterohaemorrhagiae and hardjo. Seroprevalences of 14.8 and 12.3% were found in Lima and Huancayo farms respectively, where the serovar icterohaemorrhagiae was the only detected in Lima and serovars icterohaemorrhagiae and hardjo in Huancayo farms.
6
artículo
Publicado 2017
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The study aimed to determine the seroprevalence and risk of infection of bovine leptospirosis in dairy farms of the Peruvian coast and highlands. A total of 88 blood samples were obtained in a farm in the area of Lima (coast) and 163 samples in a farm in the area of Huancayo (highlands), both belonging to the National University of San Marcos. The samples were analyzed by the microagglutination test to detect antibodies to serovars canicola, pomona, icterohaemorrhagiae and hardjo. Seroprevalences of 14.8 and 12.3% were found in Lima and Huancayo farms respectively, where the serovar icterohaemorrhagiae was the only detected in Lima and serovars icterohaemorrhagiae and hardjo in Huancayo farms.
7
artículo
Publicado 2019
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The aim of this study was to compare the productive performance of two guinea pig meat lines (Cavia porcellus) reared in the central coast of Peru. Two genetic lines of guinea pigs were used during the growth and fattening stage: a group of 20 male guinea pig, progeny of improved guinea pigs in the Peruvian highlands, meat line G, and another group of 20 improved male guinea pigs in the Peruvian coast, meat line H. The guinea pigs were reared in individual cages from weaning (15 ± 2 days) until week 11, receiving the same diet based on Zea mays var. indurata, wheat bran and fresh water. The birth weight for guinea pigs G and H was 146.5 ± 28.2 and 119.0 ± 19.2 g, respectively, the weaning weight was 306.5 ± 49.1 and 227.0 ± 58.2, respectively, and the weight at week 11 was 965.5 ± 100.2 and 868.0 ± 91.6, respectively (p<0.05 in all cases). No significant difference was found in...
8
artículo
Publicado 2019
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The aim of this study was to compare the productive performance of two guinea pig meat lines (Cavia porcellus) reared in the central coast of Peru. Two genetic lines of guinea pigs were used during the growth and fattening stage: a group of 20 male guinea pig, progeny of improved guinea pigs in the Peruvian highlands, meat line G, and another group of 20 improved male guinea pigs in the Peruvian coast, meat line H. The guinea pigs were reared in individual cages from weaning (15 ± 2 days) until week 11, receiving the same diet based on Zea mays var. indurata, wheat bran and fresh water. The birth weight for guinea pigs G and H was 146.5 ± 28.2 and 119.0 ± 19.2 g, respectively, the weaning weight was 306.5 ± 49.1 and 227.0 ± 58.2, respectively, and the weight at week 11 was 965.5 ± 100.2 and 868.0 ± 91.6, respectively (p<0.05 in all cases). No significant difference was found in...
9
artículo
Publicado 2021
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Reproductive records (n=6350) of a dairy herd between 2000 and the first semester of 2016 were used based on the reproductive indices of the herd, considering the number of services per pregnancy, open days, pregnancy rate and occurrence of abortions. In total, 58 Holstein cows selected at random were genotyped to determine the presence of reproductive haplotypes (HH) that affect the reproductive performance of cows causing abortions. It was determined that 5.2% of the cows were carriers for HH1, 5.2% for HH3 and 3.4% for HH5, not finding carrier animals for the HH2 and HH4 haplotypes. Besides, 75% of the carrier cows (6/8) presented abortions not associated with the haplotype, except for one event whose reproducer was a carrier for HH3. Likewise, 54% of the non-carrier cows presented abortion events (27/50), not establishing a direct effect of the haplotype on the occurrence of abortion...
10
artículo
Publicado 2018
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The Lima coast is highly affected by anthropogenic effluents from wastewater from contaminated urban rivers that flow into the coast. The objective of this study was to investigate the resistance to mercury and antibiotics, and the transfer of resistance to mercury by conjugative plasmids in 55 strains of Escherichia coli isolated of surface seawater from coastal Lima, Peru. The Minimum Inhibitory Concentration (MIC) was determined for various antibiotics and for mercury in the isolated strains. To confirm the plasmid resistance to mercury, the curing was carried out with 10% sodium dodecyl sulfate (SDS). The plasmid transfer assay by conjugation was performed using the E. coli DH5α as recipient strain only with the strains that showed sensitivity to mercury after curing. The extraction of the resistance plasmids was carried out only in the transconjugant strains resistant to mercury. 4...
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12
artículo
Publicado 2022
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Cerro Colorado Chico prospect is located to the south of the Ancash region, it is characterized by the presence of brecciated siliceous bodies (POD quartz) with restricted halos of advanced argillic alteration silica-pyrophyllite-alunite and an extensive alteration silic-sericite-pyrite, breccias and bodies of hematite, hematitized horizons affecting volcanic-sedimentary rocks of the Casma Group, and distal quartz veins. For this research have been geological mapping at 1:5000 scale, ASTER image analysis, ICP-AES analysis of 208 rock samples, petrographic, mineragraphic and XRD mineralogical analysis of 14 samples and fluid inclusion analysis of 4 samples. The altered rocks show an enrichment in Au, As, Sr, Ba, V, Fe, Ni and depletion of Cu, Pb, Zn, Al, Ti, Sc, Co and Mn. Petrographic studies show up to three generations of quartz and abundant hematite, sometimes replacing magnetite mold...
13
tesis de grado
Publicado 2025
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La zona árida del Pacífico Sudeste, que abarca los desiertos costeros de Perú y Chile, presenta varios humedales influenciados por las aguas de surgencia, y que brindan servicios ecosistémicos críticos. A pesar de la importancia de humedales, como la laguna costera Poza La Arenilla (PLA) en Lima, Perú, su proximidad a áreas urbanas los expone a la eutrofización. Esto, a su vez, plantea desafíos considerables para los esfuerzos de conservación. Las estrategias efectivas de conservación requieren una evaluación integral de las condiciones tróficas, lograda en este estudio mediante el análisis de las asociaciones de foraminíferos bentónicos vivos y muertos. Estos microorganismos sirven como bioindicadores de fuentes y enriquecimiento orgánico. Exploramos sus relaciones con factores hidrológicos (oxígeno disuelto, temperatura, salinidad) y parámetros sedimentarios (materi...
14
artículo
Publicado 1987
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In this article, the author analyzes three of the various alternatives of organizational restructuring which have been proposed for the Worker 's Agrarian Cooperatives of the Peruvian coast, stressing in the possibilities of each of them to solve the main internal problems of this kind of business organizations. Likewise, the author identifies the main internal problems which, linked to external factors, have led to the Cooperatives' crisis and their desintegration into individual plots. He also discusses, at a theoretical level, the advantages and disadvantages of a family plot model, vis-a-vis the cooperative one. Finally, he analyzes three restructuring options ("sectorization" -smaller-sizes cooperatives-, service cooperatives and "worker 's partnerships"), as mechanisms that may overcome the Cooperatives' inherent problems, while maintaining their advantages, such as economies of sc...
15
artículo
Publicado 2020
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The wind off the Peru coast has influence on marine physical, chemical and biological processes, both in surface and sub-surface layers and impacts coastal sea currents, sea surface temperature, vertical mixing layer, transport and retention of larvae in the sea. Furthermore it influences the approach of oceanic waters towards the coast and in other cases it favors the extension of Cold Coastal Waters and Mixing Waters off the Peruvian coast through the coastal upwelling. Therefore, the intensification and weakening of coastal wind have a strong impact on environmental conditions and the ecosystem. In this work, satellite wind data obtained through the ASCAT (Advanced Scatterometer) scaterometer from a coastal strip up to 100 km (approximately 62 nautical miles) off Peru was used in five areas: Paita, Chicama, Callao, San Juan de Marcona and Ilo, during the period from March 21, 2007 to ...
16
artículo
We report 8 species of Ellobiidae from the Peruvian coast, which belong to the subfamilies Ellobiinae: Ellobium stagnale (Orbigny, 1835) and Sarnia frumentum Petit, 1842; Melampodinae: Melampus carolianus (Lesson, 1842), Melampus olivaceus Carpenter, 18574 and Detracia graminea Morrison, 1846; and Pedipedinae: Marinula acuta (Orbigny, 1835), Marinula concinna (C.B Adams, 1852) and Marinula pepita King, 1831. Six species live associated to the mangrove of the department of Tumbes, and two in boulder beaches in the limits of the Peruvian Province. Four tropical species are registered for the first time in the Peruvian Sea: A. stagnale, M. olivaceus, D. graminea and M. acuta.
17
artículo
We report 8 species of Ellobiidae from the Peruvian coast, which belong to the subfamilies Ellobiinae: Ellobium stagnale (Orbigny, 1835) and Sarnia frumentum Petit, 1842; Melampodinae: Melampus carolianus (Lesson, 1842), Melampus olivaceus Carpenter, 18574 and Detracia graminea Morrison, 1846; and Pedipedinae: Marinula acuta (Orbigny, 1835), Marinula concinna (C.B Adams, 1852) and Marinula pepita King, 1831. Six species live associated to the mangrove of the department of Tumbes, and two in boulder beaches in the limits of the Peruvian Province. Four tropical species are registered for the first time in the Peruvian Sea: A. stagnale, M. olivaceus, D. graminea and M. acuta.
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artículo
Publicado 2005
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This paper describes 84 species of the Peruvian north coast pastures, from Tumbes – Trujillo (3º30’ – 8º S). Savannas are predominant vegetation type in the area, where algarrobo Prosopis pallida is the dominant tree and the pastures are basically Poaceae (grasses) over a large area. Keys for taxonomic identification of families, genera and species are included, and commentaries on geographical distribution.
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artículo
Publicado 2005
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This paper describes 84 species of the Peruvian north coast pastures, from Tumbes – Trujillo (3º30’ – 8º S). Savannas are predominant vegetation type in the area, where algarrobo Prosopis pallida is the dominant tree and the pastures are basically Poaceae (grasses) over a large area. Keys for taxonomic identification of families, genera and species are included, and commentaries on geographical distribution.
20
artículo
Publicado 2020
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There are at least 180 species of bats in Peru. However, there are few studies about ectoparasites of bats, among which the so-called bat flies (Diptera: Streblidae and Nycteribiidae) stand out, with a total of 158 species estimated for the Neotropical region. In Peru, one of the ecological regions with the least information is the coast. In this study we updated the knowledge of the ectoparasite-host associations in bats from the Peruvian coast, one of the regions of the country with the most degradation and loss of habitat. Five locations in the Piura, Lima and Tacna regions were evaluated. 85 bats belonging to 7 species were captured: 4 from Phyllostomidae, 2 from Molossidae and 1 from Vespertilionidae. Six dipterous species (Diptera: Streblidae) and one Hemiptera species (Hemiptera: Polyctenidae) were found and some of these associations are reported for the first time in the Lima an...
