单词 STEM的词源
Old English stemn; related to Old Norse stafn stem of a ship, German Stamm tribe, Gothic stōma basis, Latin stāmen thread.
英语动词STEM的变化形式
PRESENT
Present
I stem
you stem
he/she/it stems
we stem
you stem
they stem
Present continuous
I am stemming
you are stemming
he/she/it is stemming
we are stemming
you are stemming
they are stemming
Present perfect
I have stemmed
you have stemmed
he/she/it has stemmed
we have stemmed
you have stemmed
they have stemmed
Present perfect continuous
I have been stemming
you have been stemming
he/she/it has been stemming
we have been stemming
you have been stemming
they have been stemming
PAST
Past
I stemmed
you stemmed
he/she/it stemmed
we stemmed
you stemmed
they stemmed
Past continuous
I was stemming
you were stemming
he/she/it was stemming
we were stemming
you were stemming
they were stemming
Past perfect
I had stemmed
you had stemmed
he/she/it had stemmed
we had stemmed
you had stemmed
they had stemmed
Past perfect continuous
I had been stemming
you had been stemming
he/she/it had been stemming
we had been stemming
you had been stemming
they had been stemming
FUTURE
Future
I will stem
you will stem
he/she/it will stem
we will stem
you will stem
they will stem
Future continuous
I will be stemming
you will be stemming
he/she/it will be stemming
we will be stemming
you will be stemming
they will be stemming
Future perfect
I will have stemmed
you will have stemmed
he/she/it will have stemmed
we will have stemmed
you will have stemmed
they will have stemmed
Future perfect continuous
I will have been stemming
you will have been stemming
he/she/it will have been stemming
we will have been stemming
you will have been stemming
they will have been stemming
CONDITIONAL
Conditional
I would stem
you would stem
he/she/it would stem
we would stem
you would stem
they would stem
Conditional continuous
I would be stemming
you would be stemming
he/she/it would be stemming
we would be stemming
you would be stemming
they would be stemming
Conditional perfect
I would have stem
you would have stem
he/she/it would have stem
we would have stem
you would have stem
they would have stem
Conditional perfect continuous
I would have been stemming
you would have been stemming
he/she/it would have been stemming
we would have been stemming
you would have been stemming
they would have been stemming
IMPERATIVE
Imperative
you stem
we let´s stem
you stem
NONFINITE VERB FORMS
Present Participle
stemming
«STEM»的英语 引用
单词
stem的知名引用和例句
I am opposed to both cloning and the destruction of human embryos and adamantly opposed to funding of embryonic stem cell research.
Under current federal policy on human embryonic stem cell research, only those stem cell lines derived before August 9, 2001 are eligible for federally funded research.
Stem cell research holds out the promise of finding cures and treatments for a wide range of diseases.
Sure, President Bush can say that the U.S. government won't fund stem cell research, but believe me, Japan is applauding. Because they will just do it first and get all the patents.
If we don't somehow stem the tide of childhood obesity, we're going to have a huge problem.
There are lots of other issues in policy including the stem cell issue.
When we talk about stem cells, we are actually talking about a complicated series of things, including adult stem cells which are largely cells devoted to replacing individual tissues like blood elements or liver or even the brain.
We can continue to make significant strides in the scientific community by exploring new stem cell research methods that do not include destroying human embryos.
Love thou the rose, yet leave it on its stem.
There are no bona fide treatments available for embryonic stem cells. There is nothing in the laboratory, and there is certainly nothing in the clinics available to patients.
与 «STEM»相关的英语书籍
在以下的参考文献中发现
stem的用法。与
stem相关的书籍以及同一来源的简短摘要提供其在 英语文献中的使用情境。
The role that stem cells play in the development of cancer is also an important area. This book provides up-to-date reviews on a wide variety of stem cell systems by world experts.
2
Fundamentals of the
Stem Cell Debate: The Scientific, ...
This book encompasses the complexities without sacrificing the other main virtue of the collection: to definitively illuminate the debate for all.
Kristen R. Monroe, Ronald Baker Miller, Jerome S. Tobis,
2008
3
The Human Embryonic
Stem Cell Debate: Science, Ethics, and ...
Discusses the ethical issues involved in the use of human embryonic stem cells in regenerative medicine.
Suzanne Holland, Karen Lebacqz, Laurie Zoloth,
2001
4
Adult Neurogenesis:
Stem Cells and Neuronal Development in ...
This is the first comprehensive, integrated account of one of the most exciting areas of neuroscience.
Accompanying CD-ROM (in v. 2) has image collections which can be saved in PowerPoint or HTML.
Stem cell research also involves complex ethical and legal considerations since they involve adult, foetal tissue and embryonic sources. This new book brings together leading research from throughout the world in this frontier field.
Provides a synopsis of the scientific, ethical, and legal issues that surround stem cell research.
8
Hematopoietic
Stem Cell Protocols
A group of leading stem-cell investigators describe in detail the key laboratory methods for investigating hematopoietic stem cells.
Christopher A. Klug, Craig T. Jordan,
2002
9
Stem Cell Research: Medical Applications and Ethical Controversy
Explaining how stems cells can be obtained from several places including skin, bone marrow, and most usefully, embryos, this book covers all the fundamental aspects of stem cell research in an easy-to-follow manner.
10
Blood and Marrow
Stem Cell Transplantation: Principles, ...
The Third Edition Has Been Updated And Revised To Reflect The Most Current Research Related To The Past, Present, And Future Of Blood And Marrow Stem Cell Transplants.
Susan Ezzone, Kim Schmit-Pokorny,
2007
包含词语«STEM»的新条目
找出国内和国际出版社所讨论的内容，以及词语
stem在以下新条目的上下文中是如何使用的。
New and Improved Stem Cells Have the Potential to Restore Sight …
An exciting breakthrough in stem cell research was just announced by the University of Toronto. Using a gel-like biomaterial, scientists were able to prolong the ... «Science Times, 五月 15»
FACT SHEET: President Obama Announces Over $240 Million in …
With the commitments being made today, the President's “Educate to Innovate” campaign has resulted in over $1 billion in financial and in-kind support for STEM ... «Whitehouse.gov, 三月 15»
Scientists explain how stem cells and 'bad luck' cause cancer
Why are some types of cancer so much more common than others? Sometimes it's due to faulty genes inherited from one's parents and sometimes to behaviors ... «Los Angeles Times, 一月 15»
Stem Cells Allow Nearly Blind Patients to See
In the study, 18 patients with either disorder received transplants of retinal epithelial cells (RPE) made from stem cells that came from human embryos. «TIME, 十月 14»
Japanese Researcher, an Author of a Discredited Stem Cell Study …
A leading Japanese life science researcher and co-author of a stem cell study that was later retracted because of errors and allegations of misconduct has taken ... «New York Times, 八月 14»
Stem Cell Research Papers Are Retracted
Two scientific papers that initially electrified biologists by describing an easy way to make stem cells were retracted on Wednesday by the journal that published ... «New York Times, 七月 14»
Stem-cell scientist found guilty of misconduct
But Japanese researcher stands by her claim to be able to produce stem cells ... cells that share embryonic stem cells' capacity to turn into all of the body's cells. «Nature.com, 四月 14»
Acid bath offers easy path to stem cells
I would have never thought external stress could have this effect,” says Yoshiki Sasai, a stem-cell researcher at the RIKEN Center for Developmental Biology in ... «Nature.com, 一月 14»
Meet 'Schmeat': Say Hello to the Stem-Cell Hamburger
True beef or not true beef? That is the question two volunteers sampling a burger in front of an invited audience in a London theater attempted to answer earlier ... «TIME, 八月 13»
Human stem cells created by cloning
Most groups gave up long ago on the finicky core method — production of patient-specific embryonic stem cells (ESCs) from cloning. A quieter debate followed: ... «Nature.com, 五月 13»