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1

Evidence of Ice Age humans in eastern Beringia suggests early migration to North America

Vachula, Richard S., Huang, Yongsong, Longo, William M., Dee, Sylvia G., Daniels, William C., Russell, James M.

Journal:

Quaternary Science Reviews

Year:

2019

Language:

english

File:

PDF, 1.55 MB

english, 2019

2

Sedimentary biomarkers reaffirm human impacts on northern Beringian ecosystems during the Last Glacial period

Vachula, Richard S., Huang, Yongsong, Russell, James M., Abbott, Mark B., Finkenbinder, Matthew S., O'Donnell, Jonathan A.

Journal:

Year:

2020

File:

PDF, 2.69 MB

2020

3

Polarization Detection of a Fluctuating Radar Target

Vachula, George, Barnes, Richard

Journal:

IEEE Transactions on Aerospace and Electronic Systems

Year:

1983

Language:

english

File:

PDF, 2.21 MB

english, 1983

4

Ex Vivo Expansion of Frozen/Thawed CD34+ Cells Isolated from Frozen Human Apheresis Products

MARTINSON, JEFFREY A., LOUDOVARIS, MAUREEN, SMITH, STEPHEN L., BENDER, JAMES G., VACHULA, MONA, VAN EPPS, DENNIS E., KAIZER, HERBERT, GHALIE, RICHARD G., McLEOD, BRUCE C.

Journal:

Journal of Hematotherapy

Year:

1997

Language:

english

File:

PDF, 1.63 MB

english, 1997

5

Holocene climatic change in the Alaskan Arctic as inferred from oxygen-isotope and lake-sediment analyses at Wahoo Lake

Vachula, Richard S, Chipman, Melissa L, Hu, Feng Sheng

Journal:

Year:

2017

Language:

english

File:

PDF, 1.50 MB

english, 2017

6

Informing sedimentary charcoal-based fire reconstructions with a kinematic transport model

Vachula, Richard S, Richter, Nora

Journal:

Year:

2017

Language:

english

File:

PDF, 1.81 MB

english, 2017

7

Assessing the spatial fidelity of sedimentary charcoal size fractions as fire history proxies with a high-resolution sediment record and historical data

Vachula, Richard S., Russell, James M., Huang, Yongsong, Richter, Nora

Journal:

Palaeogeography, Palaeoclimatology, Palaeoecology

Year:

2018

Language:

english

File:

PDF, 2.29 MB

english, 2018

8

Comparison of black carbon chemical oxidation and macroscopic charcoal counts for quantification of fire by-products in sediments

Vachula, Richard S., Santos, Ewerton, Alexandre, Marcelo R., Huang, Yongsong

Journal:

Organic Geochemistry

Year:

2018

Language:

english

File:

PDF, 715 KB

english, 2018

9

Spatial distribution characteristics and environmental significance of phytoliths in surface sediments of Qingshitan Lake in Southwest China

Li, Rencheng, Fan, Jun, Vachula, Richard S., Tan, Shuhui, Qing, Xiang

Journal:

Journal of Paleolimnology

Year:

2018

Language:

english

File:

PDF, 1.87 MB

english, 2018

10

A usage-based size classification scheme for sedimentary charcoal

Vachula, Richard S

Journal:

Year:

2018

Language:

english

File:

PDF, 99 KB

english, 2018

11

Systematic chemotaxonomic profiling and novel paleotemperature indices based on alkenones and alkenoates: potential for disentangling mixed species input

Zheng, Yinsui, Heng, Patrick, Conte, Maureen H., Vachula, Richard S., Huang, Yongsong

Journal:

Organic Geochemistry

Year:

2018

Language:

english

File:

PDF, 2.33 MB

english, 2018

12

Temperature-controlled tundra fire severity and frequency during the last millennium in the Yukon-Kuskokwim Delta, Alaska

Sae-Lim, Jarunetr, Russell, James M, Vachula, Richard S, Holmes, Robert M, Mann, Paul J, Schade, John D, Natali, Susan M

Journal:

Year:

2019

Language:

english

File:

PDF, 1.01 MB

english, 2019

13

New insights into environmental controls on the occurrence and abundance of Group I alkenones and their paleoclimate applications: Evidence from volcanic lakes of northeastern China

Yao, Yuan, Zhao, Jiaju, Longo, William M., Li, Gaoyuan, Wang, Xian, Vachula, Richard S., Wang, Karen J., Huang, Yongsong

Journal:

Earth and Planetary Science Letters

Year:

2019

Language:

english

File:

PDF, 3.27 MB

english, 2019

14

Peak analysis of sedimentary charcoal records: Some underlying assumptions and potential pitfalls

Crawford, Alastair J., Vachula, Richard S.

Journal:

Quaternary Science Reviews

Year:

2019

Language:

english

File:

PDF, 357 KB

english, 2019

15

Sedimentary charcoal proxy records of fire in Alaskan tundra ecosystems

Vachula, Richard S., Sae-Lim, Jarunetr, Russell, James M.

Journal:

Palaeogeography, Palaeoclimatology, Palaeoecology

Year:

2020

File:

PDF, 1.48 MB

2020

16

The morphology of experimentally produced charcoal distinguishes fuel types in the Arctic tundra

Pereboom, Eleanor MB, Vachula, Richard S, Huang, Yongsong, Russell, James

Journal:

Year:

2020

File:

PDF, 576 KB

2020

17

Correlation between the ratio of 5-methyl hexamethylated to pentamethylated branched GDGTs (HP5) and water depth reflects redox variations in stratified lakes

Yao, Yuan, Zhao, Jiaju, Vachula, Richard S., Werne, Josef P., Wu, Jing, Song, Xueshu, Huang, Yongsong

Journal:

Organic Geochemistry

Year:

2020

File:

PDF, 2.30 MB

2020

18

The ratio of microcharcoal to phytolith content in soils as a new proxy of fire activity

Wen, Mengdan, Li, Rencheng, Vachula, Richard S., Wang, Xiude, Qin, Yang, Yuan, Qiang, Tao, Xinyue

Journal:

Year:

2020

File:

PDF, 2.41 MB

2020

19

Abrupt freshening since the early Little Ice Age in Lake Sayram of arid central Asia inferred from an alkenone isomer proxy

Yao, Yuan, Lan, Jianghu, Zhao, Jiaju, Vachula, Richard S., Xu, Hai, Cai, Yanjun, Cheng, Hai, Huang, Yongsong

Journal:

Geophysical Research Letters

Year:

2020

File:

PDF, 1.83 MB

2020

20

Alaskan Lake Sediment Records and their Implications for the Beringian Standstill Hypothesis

Vachula, Richard S.

Journal:

Year:

2020

File:

PDF, 739 KB

2020

21

A meta-analytical approach to understanding the charcoal source area problem

Vachula, Richard S.

Journal:

Palaeogeography, Palaeoclimatology, Palaeoecology

Year:

2020

File:

PDF, 1.26 MB

2020