World

Subject Rankings

Bolivia Subject Rankings 2025

Agriculture and Forestry, Architecture and Design, Business and Management, Economics and Econometrics, Education, Engineering and Technology, History, Philosophy, Theology, Law, Medicine and Health Sciences, Natural Sciences, Social Sciences, Art and Humanities Rankings and Social Sciences and Humanities Rankings along with their 197 sub-branches, can be analyzed at global, national, and regional levels. You can also evaluate them based on the i10 index and citation numbers. As of Sep 18, 2024, rankings are according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in beta. This is due to the exclusion of (1.014.193) scientists categorized under 'others,' whose profiles cannot yet be determined, edited, or classified. As these fields are updated, the rankings will adjust accordingly. Please keep this in mind. See Also: [University Subject Rankings]

map
Total 49 scientist
* Total H IndexRankings
World Rank
403,734
Country Rank
11
Institution Rank :7
Ranking Based On Selection :1
Bolivia
Carlos Eduardo Salinas Salmon
Carlos Eduardo Salinas Salmon
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Cardiology
Cardiologia
altura
fisiologia
hipertension
ecocardiografia
Metrics
H-Index
i10 Index
Citation Counts
22
25
1,703
See All Rankings and Analysis
* Total H IndexRankings
World Rank
415,569
Country Rank
13
Institution Rank :1
Ranking Based On Selection :2
Bolivia
Lucia Elena Alvarado Arnez
Lucia Elena Alvarado Arnez
Universidad Privada Franz Tamayo
La Paz , Bolivia
Medical and Health Sciences / Epidemiology and Public Health
Epidemiología genética
polimorfismo
enfermedades desatendidas
biotecnología
Metrics
H-Index
i10 Index
Citation Counts
21
30
4,675
See All Rankings and Analysis
* Total H IndexRankings
World Rank
784,819
Country Rank
35
Institution Rank :4
Ranking Based On Selection :3
Bolivia
Yercin Mamani Ortiz
Yercin Mamani Ortiz
Universidad Mayor de San Simón
Cochabamba , Bolivia
Medical and Health Sciences / Epidemiology and Public Health
Non-conmunicable diseases
inequity in health
Public Health
Obesity
Metabolic Syndrom.
Metrics
H-Index
i10 Index
Citation Counts
12
16
554
See All Rankings and Analysis
* Total H IndexRankings
World Rank
873,408
Country Rank
44
Institution Rank :18
Ranking Based On Selection :4
Bolivia
Juan Carlos Ticona
Juan Carlos Ticona
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Biochemistry
Productos Naturales
antiparasitarios
plantas medicinales
Metrics
H-Index
i10 Index
Citation Counts
11
11
409
See All Rankings and Analysis
* Total H IndexRankings
World Rank
895,143
Country Rank
48
Institution Rank :20
Ranking Based On Selection :5
Bolivia
Washington Cuna
Washington Cuna
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Immunology
Inmunología
Nutrición
Parasitos
Intracelulares
Gastrointestinales
Metrics
H-Index
i10 Index
Citation Counts
11
13
382
See All Rankings and Analysis
* Total H IndexRankings
World Rank
966,798
Country Rank
57
Institution Rank :22
Ranking Based On Selection :6
Bolivia
Maria Del Pilar Navia Bueno
Maria Del Pilar Navia Bueno
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Epidemiology and Public Health
EPIDEMIOLOGIA CLINICA
Enfermedades no Transmisibles
Hematologia gran altura
Metrics
H-Index
i10 Index
Citation Counts
10
10
386
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,023,473
Country Rank
65
Institution Rank :26
Ranking Based On Selection :7
Bolivia
Aaron Eduardo Carvajal Tapia
Aaron Eduardo Carvajal Tapia
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Pediatrics and Child Health
Medicina
Pediatria
Infectología
Revistas Medico Estudiantiles
Enfermedades Emergentes y Re-emergentes
Metrics
H-Index
i10 Index
Citation Counts
9
8
309
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,139,619
Country Rank
85
Institution Rank :31
Ranking Based On Selection :8
Bolivia
Marilyn Aparicio-Effen
Marilyn Aparicio-Effen
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Neurology
Cambio climatico
salud
ambiente
ecosalud
neurologia
Metrics
H-Index
i10 Index
Citation Counts
8
8
187
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,144,076
Country Rank
86
Institution Rank :32
Ranking Based On Selection :9
Bolivia
Patricia Philco-Lima
Patricia Philco-Lima
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Epidemiology and Public Health
Epidemiología clínica
Enfermedades no transmisibles
Metrics
H-Index
i10 Index
Citation Counts
8
7
215
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,172,767
Country Rank
96
Institution Rank :11
Ranking Based On Selection :10
Bolivia
Paola Andrea Vargas Flores|Paola A Vargas, Paola Vargas, Paola Andrea Vargas
Paola Andrea Vargas Flores|Paola A Vargas, Paola Vargas, Paola Andrea Vargas
Universidad Católica Boliviana San Pablo
La Paz , Bolivia
Medical and Health Sciences / Health Sciences
Diagnóstico molecular
epidemiología
serología
Metrics
H-Index
i10 Index
Citation Counts
7
7
392
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,379,490
Country Rank
129
Institution Rank :2
Ranking Based On Selection :11
Bolivia
Henry Yamashiro Ashimine
Henry Yamashiro Ashimine
Universidad Evangélica Boliviana
Santa Cruz de la Sierra , Bolivia
Medical and Health Sciences / Health Sciences
Ciencias de la salud
Metrics
H-Index
i10 Index
Citation Counts
6
5
686
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,418,940
Country Rank
144
Institution Rank :48
Ranking Based On Selection :12
Bolivia
Flora Teresa Ibanez Mena
Flora Teresa Ibanez Mena
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Nursing and Midwifery
Enferemería en Salud materno Infantil
Enfermería en Atención Primaria de salud
Metrics
H-Index
i10 Index
Citation Counts
6
4
174
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,423,237
Country Rank
147
Institution Rank :49
Ranking Based On Selection :13
Bolivia
Aneth Vasquez
Aneth Vasquez
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Microbiology
Microbiología
Biología Molecular
Microbiología Molecular
Metrics
H-Index
i10 Index
Citation Counts
6
3
179
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,510,610
Country Rank
164
Institution Rank :28
Ranking Based On Selection :14
Bolivia
Paulina Gonzalez
Paulina Gonzalez
Universidad Privada Boliviana
Cochabamba , Bolivia
Medical and Health Sciences / Neurology
Neurología
Metrics
H-Index
i10 Index
Citation Counts
5
3
80
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,572,814
Country Rank
175
Institution Rank :55
Ranking Based On Selection :15
Bolivia
Ingrid Gaby Melgarejo Pomar
Ingrid Gaby Melgarejo Pomar
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Nursing and Midwifery
Enfermedades respiratorias
gran altura
estres oxidativo
Metrics
H-Index
i10 Index
Citation Counts
5
3
68
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,575,968
Country Rank
178
Institution Rank :57
Ranking Based On Selection :16
Bolivia
Rosaura Caron Estrada
Rosaura Caron Estrada
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Microbiology
Microbiología
Epidemiología
Bioquímica clínica
Educación superior
Metrics
H-Index
i10 Index
Citation Counts
5
2
113
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,594,431
Country Rank
183
Institution Rank :22
Ranking Based On Selection :17
Bolivia
Sandra Lucia Montaño Rodriguez
Sandra Lucia Montaño Rodriguez
Universidad Mayor de San Simón
Cochabamba , Bolivia
Medical and Health Sciences / Dentistry
Global health
Global Oral health
Dentistry based evidence
Interprofessional education
Oral and pharyngeal cancer
Metrics
H-Index
i10 Index
Citation Counts
5
4
93
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,597,322
Country Rank
185
Institution Rank :23
Ranking Based On Selection :18
Bolivia
Evelin Marcelle De Pardo Ghetti
Evelin Marcelle De Pardo Ghetti
Universidad Mayor de San Simón
Cochabamba , Bolivia
Medical and Health Sciences / Pediatrics and Child Health
pediatria
parasitologia
Metrics
H-Index
i10 Index
Citation Counts
5
3
99
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,605,893
Country Rank
189
Institution Rank :61
Ranking Based On Selection :19
Bolivia
Isabel Morales Belpaire
Isabel Morales Belpaire
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Biochemistry
Bioquímica
biotecnología
biofertilizantes
bioremediación
Metrics
H-Index
i10 Index
Citation Counts
5
1
66
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,606,856
Country Rank
190
Institution Rank :62
Ranking Based On Selection :20
Bolivia
Jose Luis San Miguel Simbron
Jose Luis San Miguel Simbron
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Physiology
Agua corporal
composición corporal y ejercicio físico en altitud
Metrics
H-Index
i10 Index
Citation Counts
5
1
52
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,625,240
Country Rank
194
Institution Rank :4
Ranking Based On Selection :21
Bolivia
Bustillos Torrez Willy
Bustillos Torrez Willy
Universidad Privada Franz Tamayo
La Paz , Bolivia
Medical and Health Sciences / Dentistry
Oral microbiology
Metrics
H-Index
i10 Index
Citation Counts
4
4
94
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,718,170
Country Rank
214
Institution Rank :35
Ranking Based On Selection :22
Bolivia
Vanessa Montoya-Leal
Vanessa Montoya-Leal
Universidad Privada Boliviana
Cochabamba , Bolivia
Medical and Health Sciences / Physiotherapy
Fisioterapia
Rehabilitación
Ingeniería Biomédica
Metrics
H-Index
i10 Index
Citation Counts
4
1
36
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,744,636
Country Rank
221
Institution Rank :70
Ranking Based On Selection :23
Bolivia
Jacqueline Calla
Jacqueline Calla
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Immunology
Inmunologia
Metrics
H-Index
i10 Index
Citation Counts
4
2
83
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,781,411
Country Rank
242
Institution Rank :1
Ranking Based On Selection :24
Bolivia
Henry Yamashiro
Henry Yamashiro
Universidad Nacional del Oriente
Libertad , Bolivia
Medical and Health Sciences / Health Sciences
Ciencias de la salud
Metrics
H-Index
i10 Index
Citation Counts
3
3
255
See All Rankings and Analysis
* Total H IndexRankings
World Rank
1,840,627
Country Rank
249
Institution Rank :78
Ranking Based On Selection :25
Bolivia
Nelson Enrique Ramirez Rodriguez
Nelson Enrique Ramirez Rodriguez
Universidad Mayor de San Andrés
La Paz , Bolivia
Medical and Health Sciences / Gastroenterology
Clinical skills
Pediatrics
Gastroenterology
Nutrition
microbiota
Metrics
H-Index
i10 Index
Citation Counts
3
1
248
See All Rankings and Analysis
* Total H Index Rankings
Rankings
403,734
Bolivia
11
7
Ranking Based On Selection: 1
Carlos Eduardo Salinas Salmon
Carlos Eduardo Salinas Salmon
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
22
25
1,703
Medical and Health Sciences / Cardiology
Cardiologia
altura
fisiologia
hipertension
ecocardiografia
See All Rankings and Analysis
* Total H Index Rankings
Rankings
415,569
Bolivia
13
1
Ranking Based On Selection: 2
Lucia Elena Alvarado Arnez
Lucia Elena Alvarado Arnez
Universidad Privada Franz Tamayo La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
21
30
4,675
Medical and Health Sciences / Epidemiology and Public Health
Epidemiología genética
polimorfismo
enfermedades desatendidas
biotecnología
See All Rankings and Analysis
* Total H Index Rankings
Rankings
784,819
Bolivia
35
4
Ranking Based On Selection: 3
Yercin Mamani Ortiz
Yercin Mamani Ortiz
Universidad Mayor de San Simón Cochabamba, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
12
16
554
Medical and Health Sciences / Epidemiology and Public Health
Non-conmunicable diseases
inequity in health
Public Health
Obesity
Metabolic Syndrom.
See All Rankings and Analysis
* Total H Index Rankings
Rankings
873,408
Bolivia
44
18
Ranking Based On Selection: 4
Juan Carlos Ticona
Juan Carlos Ticona
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
11
11
409
Medical and Health Sciences / Biochemistry
Productos Naturales
antiparasitarios
plantas medicinales
See All Rankings and Analysis
* Total H Index Rankings
Rankings
895,143
Bolivia
48
20
Ranking Based On Selection: 5
Washington Cuna
Washington Cuna
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
11
13
382
Medical and Health Sciences / Immunology
Inmunología
Nutrición
Parasitos
Intracelulares
Gastrointestinales
See All Rankings and Analysis
* Total H Index Rankings
Rankings
966,798
Bolivia
57
22
Ranking Based On Selection: 6
Maria Del Pilar Navia Bueno
Maria Del Pilar Navia Bueno
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
10
10
386
Medical and Health Sciences / Epidemiology and Public Health
EPIDEMIOLOGIA CLINICA
Enfermedades no Transmisibles
Hematologia gran altura
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,023,473
Bolivia
65
26
Ranking Based On Selection: 7
Aaron Eduardo Carvajal Tapia
Aaron Eduardo Carvajal Tapia
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
9
8
309
Medical and Health Sciences / Pediatrics and Child Health
Medicina
Pediatria
Infectología
Revistas Medico Estudiantiles
Enfermedades Emergentes y Re-emergentes
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,139,619
Bolivia
85
31
Ranking Based On Selection: 8
Marilyn Aparicio-Effen
Marilyn Aparicio-Effen
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
8
8
187
Medical and Health Sciences / Neurology
Cambio climatico
salud
ambiente
ecosalud
neurologia
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,144,076
Bolivia
86
32
Ranking Based On Selection: 9
Patricia Philco-Lima
Patricia Philco-Lima
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
8
7
215
Medical and Health Sciences / Epidemiology and Public Health
Epidemiología clínica
Enfermedades no transmisibles
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,172,767
Bolivia
96
11
Ranking Based On Selection: 10
Paola Andrea Vargas Flores|Paola A Vargas, Paola Vargas, Paola Andrea Vargas
Paola Andrea Vargas Flores|Paola A Vargas, Paola Vargas, Paola Andrea Vargas
Universidad Católica Boliviana San Pablo La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
7
7
392
Medical and Health Sciences / Health Sciences
Diagnóstico molecular
epidemiología
serología
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,379,490
Bolivia
129
2
Ranking Based On Selection: 11
Henry Yamashiro Ashimine
Henry Yamashiro Ashimine
Universidad Evangélica Boliviana Santa Cruz de la Sierra, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
6
5
686
Medical and Health Sciences / Health Sciences
Ciencias de la salud
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,418,940
Bolivia
144
48
Ranking Based On Selection: 12
Flora Teresa Ibanez Mena
Flora Teresa Ibanez Mena
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
6
4
174
Medical and Health Sciences / Nursing and Midwifery
Enferemería en Salud materno Infantil
Enfermería en Atención Primaria de salud
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,423,237
Bolivia
147
49
Ranking Based On Selection: 13
Aneth Vasquez
Aneth Vasquez
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
6
3
179
Medical and Health Sciences / Microbiology
Microbiología
Biología Molecular
Microbiología Molecular
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,510,610
Bolivia
164
28
Ranking Based On Selection: 14
Paulina Gonzalez
Paulina Gonzalez
Universidad Privada Boliviana Cochabamba, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
5
3
80
Medical and Health Sciences / Neurology
Neurología
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,572,814
Bolivia
175
55
Ranking Based On Selection: 15
Ingrid Gaby Melgarejo Pomar
Ingrid Gaby Melgarejo Pomar
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
5
3
68
Medical and Health Sciences / Nursing and Midwifery
Enfermedades respiratorias
gran altura
estres oxidativo
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,575,968
Bolivia
178
57
Ranking Based On Selection: 16
Rosaura Caron Estrada
Rosaura Caron Estrada
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
5
2
113
Medical and Health Sciences / Microbiology
Microbiología
Epidemiología
Bioquímica clínica
Educación superior
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,594,431
Bolivia
183
22
Ranking Based On Selection: 17
Sandra Lucia Montaño Rodriguez
Sandra Lucia Montaño Rodriguez
Universidad Mayor de San Simón Cochabamba, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
5
4
93
Medical and Health Sciences / Dentistry
Global health
Global Oral health
Dentistry based evidence
Interprofessional education
Oral and pharyngeal cancer
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,597,322
Bolivia
185
23
Ranking Based On Selection: 18
Evelin Marcelle De Pardo Ghetti
Evelin Marcelle De Pardo Ghetti
Universidad Mayor de San Simón Cochabamba, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
5
3
99
Medical and Health Sciences / Pediatrics and Child Health
pediatria
parasitologia
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,605,893
Bolivia
189
61
Ranking Based On Selection: 19
Isabel Morales Belpaire
Isabel Morales Belpaire
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
5
1
66
Medical and Health Sciences / Biochemistry
Bioquímica
biotecnología
biofertilizantes
bioremediación
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,606,856
Bolivia
190
62
Ranking Based On Selection: 20
Jose Luis San Miguel Simbron
Jose Luis San Miguel Simbron
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
5
1
52
Medical and Health Sciences / Physiology
Agua corporal
composición corporal y ejercicio físico en altitud
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,625,240
Bolivia
194
4
Ranking Based On Selection: 21
Bustillos Torrez Willy
Bustillos Torrez Willy
Universidad Privada Franz Tamayo La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
4
4
94
Medical and Health Sciences / Dentistry
Oral microbiology
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,718,170
Bolivia
214
35
Ranking Based On Selection: 22
Vanessa Montoya-Leal
Vanessa Montoya-Leal
Universidad Privada Boliviana Cochabamba, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
4
1
36
Medical and Health Sciences / Physiotherapy
Fisioterapia
Rehabilitación
Ingeniería Biomédica
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,744,636
Bolivia
221
70
Ranking Based On Selection: 23
Jacqueline Calla
Jacqueline Calla
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
4
2
83
Medical and Health Sciences / Immunology
Inmunologia
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,781,411
Bolivia
242
1
Ranking Based On Selection: 24
Henry Yamashiro
Henry Yamashiro
Universidad Nacional del Oriente Libertad, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
3
3
255
Medical and Health Sciences / Health Sciences
Ciencias de la salud
See All Rankings and Analysis
* Total H Index Rankings
Rankings
1,840,627
Bolivia
249
78
Ranking Based On Selection: 25
Nelson Enrique Ramirez Rodriguez
Nelson Enrique Ramirez Rodriguez
Universidad Mayor de San Andrés La Paz, Bolivia Bolivia
Metrics
H-Index
i10-Index
Citation Counts
3
1
248
Medical and Health Sciences / Gastroenterology
Clinical skills
Pediatrics
Gastroenterology
Nutrition
microbiota
See All Rankings and Analysis